[r8522]: main / trunk / interpreter / parser / SourceFile.cpp Maximize Restore History

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SourceFile.cpp    6200 lines (5693 with data), 283.6 kB

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/*----------------------------------------------------------------------------*/
/* */
/* Copyright (c) 1995, 2004 IBM Corporation. All rights reserved. */
/* Copyright (c) 2005-2009 Rexx Language Association. All rights reserved. */
/* */
/* This program and the accompanying materials are made available under */
/* the terms of the Common Public License v1.0 which accompanies this */
/* distribution. A copy is also available at the following address: */
/* http://www.oorexx.org/license.html */
/* */
/* Redistribution and use in source and binary forms, with or */
/* without modification, are permitted provided that the following */
/* conditions are met: */
/* */
/* Redistributions of source code must retain the above copyright */
/* notice, this list of conditions and the following disclaimer. */
/* Redistributions in binary form must reproduce the above copyright */
/* notice, this list of conditions and the following disclaimer in */
/* the documentation and/or other materials provided with the distribution. */
/* */
/* Neither the name of Rexx Language Association nor the names */
/* of its contributors may be used to endorse or promote products */
/* derived from this software without specific prior written permission. */
/* */
/* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS */
/* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT */
/* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS */
/* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT */
/* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, */
/* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED */
/* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, */
/* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY */
/* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING */
/* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS */
/* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
/* */
/*----------------------------------------------------------------------------*/
/******************************************************************************/
/* REXX Kernel */
/* */
/* Primitive Translator Source File Class */
/* */
/******************************************************************************/
#include <ctype.h>
#include <string.h>
#include "RexxCore.h"
#include "StringClass.hpp"
#include "ArrayClass.hpp"
#include "DirectoryClass.hpp"
#include "BufferClass.hpp"
#include "RexxActivity.hpp"
#include "RexxActivation.hpp"
#include "MethodClass.hpp"
#include "RexxNativeCode.hpp"
#include "RexxCode.hpp"
#include "RexxVariableDictionary.hpp"
#include "RexxSmartBuffer.hpp"
#include "SourceFile.hpp"
#include "ExpressionFunction.hpp" /* expression terms */
#include "ExpressionMessage.hpp"
#include "ExpressionOperator.hpp"
#include "ExpressionLogical.hpp"
#include "ExpressionBaseVariable.hpp" /* base variable management class */
#include "ExpressionCompoundVariable.hpp"
#include "ExpressionDotVariable.hpp"
#include "ExpressionVariable.hpp"
#include "IndirectVariableReference.hpp"
#include "ExpressionStem.hpp"
#include "RexxInstruction.hpp" /* base instruction definition */
#include "SelectInstruction.hpp"
#include "ElseInstruction.hpp"
#include "EndIf.hpp"
#include "DoInstruction.hpp"
#include "CallInstruction.hpp"
#include "ProtectedObject.hpp"
#include "CPPCode.hpp"
#include "SystemInterpreter.hpp"
#include "PackageClass.hpp"
#include "InterpreterInstance.hpp"
#include "ClassDirective.hpp"
#include "LibraryDirective.hpp"
#include "RequiresDirective.hpp"
#include "PackageManager.hpp"
#include "SysFileSystem.hpp"
#include "RoutineClass.hpp"
#include "ActivationFrame.hpp"
#include "StackFrameClass.hpp"
#define HOLDSIZE 60 /* room for 60 temporaries */
typedef struct _LINE_DESCRIPTOR {
size_t position; /* position within the buffer */
size_t length; /* length of the line */
} LINE_DESCRIPTOR; /* line within a source buffer */
#define line_delimiters "\r\n" /* stream file line end characters */
#define ctrl_z 0x1a // the end of file marker
/**
* Create a source object with source provided from an array.
*
* @param programname
* The name of the program.
* @param source_array
* The array of the source lines.
*/
RexxSource::RexxSource(RexxString *programname, RexxArray *source_array)
{
/* fill in the name */
setProgramName(programname);
/* fill in the source array */
OrefSet(this, this->sourceArray, source_array);
/* fill in the source size */
this->line_count = sourceArray->size();
this->position(1, 0); /* set position at the first line */
}
/**
* Create a source object with source provided from a buffer.
*
* @param programname
* The name of the program.
* @param source_buffer
* The source buffer holding the source data.
*/
RexxSource::RexxSource(RexxString *programname, RexxBuffer *source_buffer)
{
/* fill in the name */
setProgramName(programname);
// we require a bit of protection while doing this
ProtectedObject p(this);
// initialize from the buffer data
initBuffered(source_buffer);
}
/**
* Create a source object with source provided from a a data buffer
* (not a buffer object).
*
* @param programname
* The name of the program.
* @param data The data buffer pointer.
* @param length the size of the source buffer.
*/
RexxSource::RexxSource(RexxString *programname, const char *data, size_t length)
{
/* fill in the name */
setProgramName(programname);
// we require a bit of protection while doing this
ProtectedObject p(this);
// initialize from the buffer data
initBuffered(new_buffer(data, length));
}
/**
* Create a source object with source provided from a filo.
*
* @param programname
* The name of the program (also the file name)
*/
RexxSource::RexxSource(RexxString *programname)
{
/* fill in the name */
setProgramName(programname);
// we require a bit of protection while doing this
ProtectedObject p(this);
// read the file data and initialize.
initFile();
}
void RexxSource::initBuffered(
RexxBuffer *source_buffer) /* containing source buffer */
/******************************************************************************/
/* Function: Initialize a source object using the entire source as a */
/* stream buffer */
/******************************************************************************/
{
LINE_DESCRIPTOR descriptor; /* line description */
const char *scan; /* line scanning pointer */
const char *_current; /* current scan location */
char *start; /* start of the buffer */
size_t length; /* length of the buffer */
extractNameInformation(); // make sure we have name information to work with
/* set the source buffer */
OrefSet(this, this->sourceBuffer, source_buffer);
RexxSmartBuffer *indices = new RexxSmartBuffer(1024);
ProtectedObject p(indices);
/* point to the data part */
start = this->sourceBuffer->getData();
/* get the buffer length */
length = this->sourceBuffer->getDataLength();
// neutralize shell '#!...'
if (start[0] == '#' && start[1] == '!')
{
memcpy(start, "--", 2);
}
descriptor.position = 0; /* fill in the "zeroth" position */
descriptor.length = 0; /* and the length */
/* add to the line list */
indices->copyData(&descriptor, sizeof(descriptor));
this->line_count = 0; /* start with zero lines */
/* look for an EOF mark */
scan = (const char *)memchr(start, ctrl_z, length);
if (scan != NULL) /* found one? */
{
length = scan - start; /* reduce the length */
}
_current = start; /* start at the beginning */
while (length != 0)
{ /* loop until all done */
this->line_count++; /* add in another line */
/* set the start position */
descriptor.position = _current - start;
/* scan for a important character */
scan = Utilities::locateCharacter(_current, line_delimiters, length);
/* need to skip over null chars */
while (scan != OREF_NULL && *scan == '\0')
{
/* scan for a linend */
scan = Utilities::locateCharacter(scan + 1, line_delimiters, length - (scan - _current - 1));
}
if (scan == NULL)
{ /* not found, go to the end */
_current = _current + length; /* step to the end */
descriptor.length = length; /* use the entire line */
length = 0; /* nothing left to process */
}
else
{
/* calculate this line length */
descriptor.length = scan - _current;
/* adjust scan at line end */
if (*scan == line_delimiters[0])
{/* CR encountered */
scan++; /* step the scan position */
/* now check for LF */
if (length > (size_t)(scan - _current))
{
if (*scan != '\0' && *scan == line_delimiters[1]) /* */
{
scan++; /* step again, if required */
}
}
}
else /* just a LF */
{
scan++; /* step the scan position */
}
length -= scan - _current; /* reduce the length */
_current = scan; /* copy the scan pointer */
}
/* add to the line list */
indices->copyData(&descriptor, sizeof(descriptor));
}
/* throw away the buffer "wrapper" */
OrefSet(this, this->sourceIndices, indices->getBuffer());
this->position(1, 0); /* set position at the first line */
}
void RexxSource::initFile()
/******************************************************************************/
/* Function: Initialize a source object, reading the source from a file */
/******************************************************************************/
{
/* load the program file */
RexxBuffer *program_source = (RexxBuffer *)SystemInterpreter::readProgram(programName->getStringData());
if (program_source == OREF_NULL) /* Program not found or read error? */
{
/* report this */
reportException(Error_Program_unreadable_name, this->programName);
}
#ifdef SCRIPTING
if (program_source->getDataLength() > 9)
{
char begin[10];
char end[4];
// check, if XML comments have to be removed from the script... (engine situation)
memcpy(begin,program_source->getData(), 9);
// hashvalue is the length of the buffer
memcpy(end, program_source->getData()+ (program_source->getDataLength()-3), 3);
begin[9]=end[3]=0x00;
if (!Utilities::strCaselessCompare("<![CDATA[",begin) && !Utilities::strCaselessCompare("]]>",end))
{
memcpy(program_source->getData(), " ", 9);
memcpy(program_source->getData() + (program_source->getDataLength() - 3), " ", 3);
}
}
#endif
/* save the returned buffer */
OrefSet(this, this->sourceBuffer, program_source);
/* go process the buffer now */
this->initBuffered(this->sourceBuffer);
}
/**
* Extract various bits of the source name to give us directory,
* extension and file portions to be used for searches for additional
* files.
*/
void RexxSource::extractNameInformation()
{
if (programName == OREF_NULL)
{
return;
}
OrefSet(this, this->programDirectory, SysFileSystem::extractDirectory(programName));
OrefSet(this, this->programExtension, SysFileSystem::extractExtension(programName));
OrefSet(this, this->programFile, SysFileSystem::extractFile(programName));
}
/**
* Set a program name for this source object. Usually used after
* a program restore to update the restored routine object. This
* will also update the extension and directory information.
*
* @param name The new program name.
*/
void RexxSource::setProgramName(RexxString *name)
{
OrefSet(this, this->programName, name);
extractNameInformation();
}
bool RexxSource::reconnect()
/******************************************************************************/
/* Function: Attempt to reconnect to the original source code file */
/******************************************************************************/
{
if (!(this->flags&reclaim_possible)) /* no chance of getting this? */
{
return false; /* just get out of here */
}
this->initFile(); /* go reinit this */
return true; /* give back the success return */
}
void RexxSource::setReconnect()
/******************************************************************************/
/* Function: Allow a source reconnect to occur */
/******************************************************************************/
{
this->flags |= reclaim_possible; /* we have a shot at this! */
}
void RexxSource::interpretLine(size_t _line_number)
/******************************************************************************/
/* Arguments: interpret line location */
/* */
/* Function: Adjust the source object so that it thinks it is scanning a */
/* 1-line source file with a line number other than 1 so that */
/* errors and trace of an interpreted instruction will display */
/* the interpret instructions line number. */
/******************************************************************************/
{
/* fill in the source size */
this->line_count = _line_number; /* size is now the line number */
this->line_number = _line_number; /* we are now on line "nn of nn" */
/* remember for positioning */
this->interpret_adjust = _line_number - 1;
}
void RexxSource::needVariable(
RexxToken *token) /* current token */
/******************************************************************************/
/* Function: validate that the current token is a variable token */
/******************************************************************************/
{
/* not a variable token? */
if (!token->isVariable())
{
/* begin with a dot? */
if (token->value->getChar(0) == '.')
{
syntaxError(Error_Invalid_variable_period, token);
}
else
{
syntaxError(Error_Invalid_variable_number, token);
}
}
}
void RexxSource::needVariableOrDotSymbol(
RexxToken *token) /* current token */
/******************************************************************************/
/* Function: validate that the current token is a variable token */
/******************************************************************************/
{
/* not a variable token or dot symbol*/
if (!token->isVariable() && (token->subclass != SYMBOL_DOTSYMBOL)) {
syntaxError(Error_Invalid_variable_number, token);
}
}
bool RexxSource::terminator(
int terminators, /* set of possible terminators */
RexxToken *token) /* token being processed */
/******************************************************************************/
/* Function: test for a terminator token in the given context */
/******************************************************************************/
{
bool endtoken; /* found the end flag */
endtoken = false; /* not found the end yet */
/* process based on terminator class */
switch (token->classId)
{
case TOKEN_EOC: /* found the end-of-clause */
endtoken = true; /* this is always an end marker */
break;
case TOKEN_RIGHT: /* found a right paren */
if (terminators&TERM_RIGHT) /* terminate on this? */
endtoken = true; /* set the flag */
break;
case TOKEN_SQRIGHT: /* found a right square bracket */
if (terminators&TERM_SQRIGHT) /* terminate on this? */
endtoken = true; /* set the flag */
break;
case TOKEN_COMMA: /* found a comma */
if (terminators&TERM_COMMA) /* terminate on this? */
endtoken = true; /* set the flag */
break;
case TOKEN_SYMBOL: /* have a symbol, need to resolve */
if (terminators&TERM_KEYWORD)
{ /* need to do keyword checks? */
/* process based on the keyword */
switch (this->subKeyword(token))
{
case SUBKEY_TO: /* TO subkeyword */
if (terminators&TERM_TO) /* terminate on this? */
endtoken = true; /* set the flag */
break;
case SUBKEY_BY: /* BY subkeyword */
if (terminators&TERM_BY) /* terminate on this? */
endtoken = true; /* set the flag */
break;
case SUBKEY_FOR: /* FOR subkeyword */
if (terminators&TERM_FOR) /* terminate on this? */
{
endtoken = true; /* set the flag */
}
break;
case SUBKEY_WHILE: /* WHILE subkeyword */
case SUBKEY_UNTIL: /* UNTIL subkeyword */
if (terminators&TERM_WHILE)/* terminate on this? */
endtoken = true; /* set the flag */
break;
case SUBKEY_WITH: /* WITH subkeyword */
if (terminators&TERM_WITH) /* terminate on this? */
endtoken = true; /* set the flag */
break;
case SUBKEY_THEN: /* THEN subkeyword */
if (terminators&TERM_THEN) /* terminate on this? */
endtoken = true; /* set the flag */
break;
default: /* not a terminator for others */
break;
}
}
default: /* not a terminator for others */
break;
}
if (endtoken) /* found the end one? */
{
previousToken(); /* push it back on the clause */
}
return endtoken; /* return the true/false flag */
}
void RexxSource::nextLine()
/******************************************************************************/
/* Function: Advance the current position to the next source line */
/******************************************************************************/
{
if (this->clause) /* have a clause object? */
{
/* record current position in clause */
this->clause->setEnd(this->line_number, this->line_offset);
}
/* move to the start of the next line*/
this->position(this->line_number + 1, 0);
}
void RexxSource::position(
size_t line, /* target line number */
size_t offset) /* target line offset */
/******************************************************************************/
/* Function: Move the current scan position to a new spot */
/******************************************************************************/
{
LINE_DESCRIPTOR *descriptors; /* line descriptors */
const char *buffer_start; /* start of source buffer */
RexxString *new_line; /* new line to scan */
this->line_number = line; /* set the line number */
this->line_offset = offset; /* and the offset */
/* past the end? */
if (line > this->line_count)
{
this->current = OREF_NULL; /* null out the current line */
this->current_length = 0; /* tag this as a null line */
}
else
{
/* working from an array? */
if (this->sourceArray != OREF_NULL)
{
/* get the next line */
new_line = (RexxString *)(this->sourceArray->get(line - this->interpret_adjust));
if (new_line == OREF_NULL) /* missing line? */
{
/* this is an error */
reportException(Error_Translation_invalid_line);
}
/* not working with a string? */
if (!isOfClass(String, new_line))
{
/* get this as a string */
new_line = (RexxString *)new_line->stringValue();
if (new_line == TheNilObject) /* got back .nil? */
{
/* this is an error */
reportException(Error_Translation_invalid_line);
}
}
/* set the program pointer */
this->current = new_line->getStringData();
/* get the string length */
this->current_length = new_line->getLength();
}
/* single buffer source */
else
{
/* get the descriptors pointer */
descriptors = (LINE_DESCRIPTOR *)(this->sourceIndices->getData());
/* source buffered in a string? */
if (isOfClass(String, this->sourceBuffer))
{
/* point to the data part */
buffer_start = ((RexxString *)(this->sourceBuffer))->getStringData();
}
else
{
/* point to the data part */
buffer_start = this->sourceBuffer->getData();
}
/* calculate the line start */
this->current = buffer_start + descriptors[line - this->interpret_adjust].position;
/* and get the length */
this->current_length = descriptors[line - this->interpret_adjust].length;
}
}
}
void RexxSource::live(size_t liveMark)
/******************************************************************************/
/* Perform garbage collection marking of a source object */
/******************************************************************************/
{
memory_mark(this->parentSource);
memory_mark(this->sourceArray);
memory_mark(this->programName);
memory_mark(this->programDirectory);
memory_mark(this->programExtension);
memory_mark(this->programFile);
memory_mark(this->clause);
memory_mark(this->securityManager);
memory_mark(this->sourceBuffer);
memory_mark(this->sourceIndices);
memory_mark(this->first);
memory_mark(this->last);
memory_mark(this->currentInstruction);
memory_mark(this->savelist);
memory_mark(this->holdstack);
memory_mark(this->variables);
memory_mark(this->literals);
memory_mark(this->labels);
memory_mark(this->strings);
memory_mark(this->guard_variables);
memory_mark(this->exposed_variables);
memory_mark(this->control);
memory_mark(this->terms);
memory_mark(this->subTerms);
memory_mark(this->operators);
memory_mark(this->calls);
memory_mark(this->routines);
memory_mark(this->public_routines);
memory_mark(this->class_dependencies);
memory_mark(this->requires);
memory_mark(this->libraries);
memory_mark(this->loadedPackages);
memory_mark(this->package);
memory_mark(this->classes);
memory_mark(this->installed_public_classes);
memory_mark(this->installed_classes);
memory_mark(this->merged_public_classes);
memory_mark(this->merged_public_routines);
memory_mark(this->methods);
memory_mark(this->active_class);
memory_mark(this->initCode);
}
void RexxSource::liveGeneral(int reason)
/******************************************************************************/
/* Function: Perform generalized marking of a source object */
/******************************************************************************/
{
#ifndef KEEPSOURCE
if (memoryObject.savingImage()) { /* save image time? */
/* don't save the source image */
OrefSet(this, this->sourceArray, OREF_NULL);
OrefSet(this, this->sourceBuffer, OREF_NULL);
OrefSet(this, this->sourceIndices, OREF_NULL);
OrefSet(this, this->clause, OREF_NULL);
/* don't save the install information*/
OrefSet(this, this->methods, OREF_NULL);
OrefSet(this, this->requires, OREF_NULL);
OrefSet(this, this->classes, OREF_NULL);
OrefSet(this, this->routines, OREF_NULL);
OrefSet(this, this->libraries, OREF_NULL);
OrefSet(this, this->installed_classes, OREF_NULL);
OrefSet(this, this->installed_public_classes, OREF_NULL);
OrefSet(this, this->merged_public_classes, OREF_NULL);
OrefSet(this, this->merged_public_routines, OREF_NULL);
this->flags &= ~reclaim_possible; /* can't recover source immediately */
}
#endif
memory_mark_general(this->sourceArray);
memory_mark_general(this->parentSource);
memory_mark_general(this->programName);
memory_mark_general(this->programDirectory);
memory_mark_general(this->programExtension);
memory_mark_general(this->programFile);
memory_mark_general(this->clause);
memory_mark_general(this->securityManager);
memory_mark_general(this->sourceBuffer);
memory_mark_general(this->sourceIndices);
memory_mark_general(this->first);
memory_mark_general(this->currentInstruction);
memory_mark_general(this->last);
memory_mark_general(this->savelist);
memory_mark_general(this->holdstack);
memory_mark_general(this->variables);
memory_mark_general(this->literals);
memory_mark_general(this->labels);
memory_mark_general(this->strings);
memory_mark_general(this->guard_variables);
memory_mark_general(this->exposed_variables);
memory_mark_general(this->control);
memory_mark_general(this->terms);
memory_mark_general(this->subTerms);
memory_mark_general(this->operators);
memory_mark_general(this->calls);
memory_mark_general(this->routines);
memory_mark_general(this->public_routines);
memory_mark_general(this->class_dependencies);
memory_mark_general(this->requires);
memory_mark_general(this->libraries);
memory_mark_general(this->loadedPackages);
memory_mark_general(this->package);
memory_mark_general(this->classes);
memory_mark_general(this->installed_public_classes);
memory_mark_general(this->installed_classes);
memory_mark_general(this->merged_public_classes);
memory_mark_general(this->merged_public_routines);
memory_mark_general(this->methods);
memory_mark_general(this->active_class);
memory_mark_general(this->initCode);
}
void RexxSource::flatten (RexxEnvelope *envelope)
/******************************************************************************/
/* Function: Flatten a source object */
/******************************************************************************/
{
setUpFlatten(RexxSource)
/* if we are flattening for EA's, we */
/* don't need to to keep source info */
/* so ask the envelope if this is a */
/* flatten to save the method image */
this->sourceArray = OREF_NULL;
this->sourceBuffer = OREF_NULL;
this->sourceIndices = OREF_NULL;
this->securityManager = OREF_NULL;
flatten_reference(newThis->sourceArray, envelope);
flatten_reference(newThis->parentSource, envelope);
flatten_reference(newThis->programName, envelope);
flatten_reference(newThis->programDirectory, envelope);
flatten_reference(newThis->programExtension, envelope);
flatten_reference(newThis->programFile, envelope);
flatten_reference(newThis->clause, envelope);
flatten_reference(newThis->securityManager, envelope);
flatten_reference(newThis->sourceBuffer, envelope);
flatten_reference(newThis->sourceIndices, envelope);
flatten_reference(newThis->first, envelope);
flatten_reference(newThis->last, envelope);
flatten_reference(newThis->currentInstruction, envelope);
flatten_reference(newThis->savelist, envelope);
flatten_reference(newThis->holdstack, envelope);
flatten_reference(newThis->variables, envelope);
flatten_reference(newThis->literals, envelope);
flatten_reference(newThis->labels, envelope);
flatten_reference(newThis->strings, envelope);
flatten_reference(newThis->guard_variables, envelope);
flatten_reference(newThis->exposed_variables, envelope);
flatten_reference(newThis->control, envelope);
flatten_reference(newThis->terms, envelope);
flatten_reference(newThis->subTerms, envelope);
flatten_reference(newThis->operators, envelope);
flatten_reference(newThis->calls, envelope);
flatten_reference(newThis->routines, envelope);
flatten_reference(newThis->public_routines, envelope);
flatten_reference(newThis->class_dependencies, envelope);
flatten_reference(newThis->requires, envelope);
flatten_reference(newThis->libraries, envelope);
flatten_reference(newThis->loadedPackages, envelope);
flatten_reference(newThis->package, envelope);
flatten_reference(newThis->classes, envelope);
flatten_reference(newThis->installed_public_classes, envelope);
flatten_reference(newThis->installed_classes, envelope);
flatten_reference(newThis->merged_public_classes, envelope);
flatten_reference(newThis->merged_public_routines, envelope);
flatten_reference(newThis->methods, envelope);
flatten_reference(newThis->active_class, envelope);
flatten_reference(newThis->initCode, envelope);
cleanUpFlatten
}
size_t RexxSource::sourceSize()
/******************************************************************************/
/* Function: Return count of lines in the source. If the source is not */
/* available, return 0 */
/******************************************************************************/
{
/* currently no source? */
if ((this->sourceArray == OREF_NULL && this->sourceBuffer == OREF_NULL))
{
if (!this->reconnect()) /* unable to recover the source? */
{
return 0; /* we have no source lines */
}
}
return this->line_count; /* return the line count */
}
bool RexxSource::isTraceable()
/******************************************************************************/
/* Function: Determine if a program is traceable (i.e., the program source */
/* is available) */
/******************************************************************************/
{
/* currently no source? */
if ((this->sourceArray == OREF_NULL && this->sourceBuffer == OREF_NULL))
{
return this->reconnect(); /* unable to recover the source? */
}
return true; /* return the line count */
}
RexxString *RexxSource::get(
size_t _position) /* requested source line */
/******************************************************************************/
/* Function: Extract a give source line from the source program */
/******************************************************************************/
{
LINE_DESCRIPTOR *descriptors; /* line descriptors */
const char *buffer_start; /* start of source buffer */
if (_position > this->line_count) /* beyond last line? */
{
return OREF_NULLSTRING; /* just return a null string */
}
/* working from an array? */
if (this->sourceArray != OREF_NULL)
{
/* return the array line */
return(RexxString *)(this->sourceArray->get(_position));
}
/* buffered version? */
else if (this->sourceBuffer != OREF_NULL)
{
/* get the descriptors pointer */
descriptors = (LINE_DESCRIPTOR *)(this->sourceIndices->getData());
/* source buffered in a string? */
if (isOfClass(String, this->sourceBuffer))
{
/* point to the data part */
buffer_start = ((RexxString *)(this->sourceBuffer))->getStringData();
}
else
{
/* point to the data part */
buffer_start = this->sourceBuffer->getData();
}
/* create a new string version */
return new_string(buffer_start + descriptors[_position].position, descriptors[_position].length);
}
else
{
return OREF_NULLSTRING; /* we have no line */
}
}
void RexxSource::nextClause()
/*********************************************************************/
/* Extract a clause from the source and return as a clause object. */
/* The clause object contains a list of all of the tokens contained */
/* within the clause and is used by the parser to determine the */
/* type of instruction and create the instruction parse tree. */
/*********************************************************************/
{
RexxToken *token; /* current token being processed */
SourceLocation location; /* location of the clause */
SourceLocation token_location; /* location of each token */
/* need to scan off a clause? */
if (!(this->flags&reclaimed))
{
this->clause->newClause(); /* reset the clause object */
/* loop until we get an non-null */
for (;;)
{
/* record the start position */
this->clause->setStart(this->line_number, this->line_offset);
/* get the next source token */
/* (blanks are not significant here) */
token = this->sourceNextToken(OREF_NULL);
/* hit the end of the file? */
if (token == OREF_NULL)
{
this->flags |= no_clause; /* flag this as a no clause */
return; /* we're finished */
}
/* is this the end of the clause? */
if (!token->isEndOfClause())
{
break; /* we've got what we need */
}
this->clause->newClause(); /* reset the clause object */
}
/* get the start position */
token_location = token->getLocation();
location = token_location; /* copy the location info */
/* record in clause for errors */
this->clause->setLocation(location);
/* loop until physical end of clause */
for (;;)
{
/* get the next token of real clause */
/* (blanks can be significant) */
token = this->sourceNextToken(token);
/* get this tokens location */
token_location = token->getLocation();
if (token->isEndOfClause()) /* end of the clause now? */
{
break; /* hit the physical end of clause */
}
}
location.setEnd(token_location);
/* record the clause position */
this->clause->setLocation(location);
}
this->flags &= ~reclaimed; /* no reclaimed clause */
// always set the error information
clauseLocation = clause->getLocation();
}
/* extra space required to format a */
/* result line. This overhead is */
/* 8 leading spaces for the line */
/* number, + 1 space + length of the */
/* message prefix (3) + 1 space + */
/* 2 for an indent + 2 for the */
/* quotes surrounding the value */
#define TRACE_OVERHEAD 16
/* overhead for a traced instruction */
/* (8 digit line number, blank, */
/* 3 character prefix, and a blank */
#define INSTRUCTION_OVERHEAD 11
#define LINENUMBER 6 /* size of a line number */
#define PREFIX_OFFSET (LINENUMBER + 1) /* location of the prefix field */
#define PREFIX_LENGTH 3 /* length of the prefix flag */
#define INDENT_SPACING 2 /* spaces per indentation amount */
/**
* Create a stack frame for this parsing context.
*
* @return a stack frame instance for error reporting
*/
StackFrameClass *RexxSource::createStackFrame()
{
// construct the traceback line before we allocate the stack frame object.
// calling this in the constructor argument list can cause the stack frame instance
// to be inadvertently reclaimed if a GC is triggered while evaluating the constructor
// arguments.
RexxString *traceback = traceBack(clauseLocation, 0, true);
return new StackFrameClass(FRAME_PARSE, programName, OREF_NULL, OREF_NULL, OREF_NULL, traceback, clauseLocation.getLineNumber());
}
RexxString *RexxSource::traceBack(
SourceLocation &location, /* value to trace */
size_t indent, /* blank indentation */
bool trace ) /* traced instruction (vs. error) */
/******************************************************************************/
/* Function: Format a source line for traceback or tracing */
/******************************************************************************/
{
RexxString *buffer; /* buffer for building result */
RexxString *line; /* actual line data */
size_t outlength; /* output length */
char *linepointer; /* pointer to the line number */
char linenumber[11]; /* formatted line number */
/* format the value */
sprintf(linenumber,"%u", location.getLineNumber());
line = this->extract(location); /* extract the source string */
/* doesn't exist and this isn't a */
/* trace instruction format? */
if (line == OREF_NULLSTRING)
{
RexxArray *args = new_array(this->programName);
ProtectedObject p(args);
line = ActivityManager::currentActivity->buildMessage(Message_Translations_no_source_available, args);
}
if (indent < 0) /* possible negative indentation? */
{
indent = 0; /* just reset it */
}
/* get an output string */
buffer = raw_string(line->getLength() + INSTRUCTION_OVERHEAD + indent * INDENT_SPACING);
/* blank out the first part */
buffer->set(0, ' ', INSTRUCTION_OVERHEAD + indent * INDENT_SPACING);
/* copy in the line */
buffer->put(INSTRUCTION_OVERHEAD + indent * INDENT_SPACING, line->getStringData(), line->getLength());
outlength = strlen(linenumber); /* get the line number length */
linepointer = linenumber; /* point to number start */
/* too long for defined field? */
if (outlength > LINENUMBER)
{
/* step over extra numbers */
linepointer += outlength - LINENUMBER;
*linepointer = '?'; /* overlay a question mark */
outlength = LINENUMBER; /* shorten the length */
}
/* copy in the line number */
buffer->put(LINENUMBER - outlength, linepointer, outlength);
buffer->put(PREFIX_OFFSET, "*-*", PREFIX_LENGTH);
return buffer; /* return formatted buffer */
}
RexxString *RexxSource::extract(
SourceLocation &location ) /* target retrieval structure */
/******************************************************************************/
/* Extrace a line from the source using the given location information */
/******************************************************************************/
{
RexxString *line; /* returned source line */
RexxString *source_line; /* current extracting line */
size_t counter; /* line counter */
/* currently no source? */
if ((this->sourceArray == OREF_NULL && this->sourceBuffer == OREF_NULL))
{
if (!this->reconnect()) /* unable to recover the source? */
return OREF_NULLSTRING; /* return a null array */
}
/* is the location out of bounds? */
if (location.getLineNumber() == 0 || location.getLineNumber() > this->line_count)
line = OREF_NULLSTRING; /* just give back a null string */
/* all on one line? */
else if (location.getLineNumber() >= location.getEndLine())
/* just extract the string */
line = this->get(location.getLineNumber() - this->interpret_adjust)->extract(location.getOffset(),
location.getEndOffset() - location.getOffset());
/* multiple line clause */
else
{
/* get the source line */
source_line = this->get(location.getLineNumber());
/* extract the first part */
line = source_line->extract(location.getOffset(), source_line->getLength() - location.getOffset());
/* loop down to end line */
for (counter = location.getLineNumber() + 1 - this->interpret_adjust; counter < location.getEndLine(); counter++)
{
/* concatenate the next line on */
line = line->concat(this->get(counter));
}
/* now add on the last part */
line = line->concat(this->get(counter)->extract(0, location.getEndOffset()));
}
return line; /* return the extracted line */
}
/**
* Extract all of the source from the package.
*
* @return An array of the source lines.
*/
RexxArray *RexxSource::extractSource()
{
SourceLocation location;
location.setLineNumber(1);
location.setEndLine(0);
location.setOffset(0);
return extractSource(location);
}
RexxArray *RexxSource::extractSource(
SourceLocation &location ) /* target retrieval structure */
/******************************************************************************/
/* Function: Extract a section of source from a method source object, using */
/* the created bounds for the method. */
/******************************************************************************/
{
/* currently no source? */
if ((this->sourceArray == OREF_NULL && this->sourceBuffer == OREF_NULL))
{
if (!this->reconnect()) /* unable to recover the source? */
{
/* return a null array */
return(RexxArray *)TheNullArray->copy();
}
}
/* is the location out of bounds? */
if (location.getLineNumber() == 0 || location.getLineNumber() - this->interpret_adjust > this->line_count)
{
/* just give back a null array */
return (RexxArray *)TheNullArray->copy();
}
else
{
if (location.getEndLine() == 0)
{ /* no ending line? */
/* use the last line */
location.setEnd(this->line_count, this->get(line_count)->getLength());
}
/* end at the line start? */
else if (location.getEndOffset() == 0)
{
// step back a line
location.setEndLine(location.getEndLine() - 1); /* step back a line */
/* end at the line end */
location.setEndOffset(this->get(location.getEndLine())->getLength());
}
/* get the result array */
RexxArray *source = new_array(location.getEndLine() - location.getLineNumber() + 1);
ProtectedObject p(source);
/* all on one line? */
if (location.getLineNumber() == location.getEndLine())
{
/* get the line */
RexxString *source_line = this->get(location.getLineNumber());
/* extract the line segment */
source_line = source_line->extract(location.getOffset(), location.getEndOffset() - location.getOffset());
source->put(source_line, 1); /* insert the trailing piece */
return source; /* all done */
}
if (location.getOffset() == 0) /* start on the first location? */
{
/* copy over the entire line */
source->put(this->get(location.getLineNumber()), 1);
}
else
{
/* get the line */
RexxString *source_line = this->get(location.getLineNumber());
/* extract the end portion */
source_line = source_line->extract(location.getOffset(), source_line->getLength() - location.getOffset());
source->put(source_line, 1); /* insert the trailing piece */
}
size_t i = 2;
/* loop until the last line */
for (size_t counter = location.getLineNumber() + 1; counter < location.getEndLine(); counter++, i++)
{
/* copy over the entire line */
source->put(this->get(counter), i);
}
/* get the last line */
RexxString *source_line = this->get(location.getEndLine());
/* more than one line? */
if (location.getEndLine() > location.getLineNumber())
{
/* need the entire line? */
if (location.getEndOffset() >= source_line->getLength())
{
source->put(source_line, i); /* just use it */
}
else
{
/* extract the tail part */
source->put(source_line->extract(0, location.getEndOffset() - 1), i);
}
}
return source;
}
}
void RexxSource::globalSetup()
/******************************************************************************/
/* Function: Perform global parsing initialization */
/******************************************************************************/
{
/* holding pen for temporaries */
OrefSet(this, this->holdstack, new (HOLDSIZE, false) RexxStack(HOLDSIZE));
/* create a save table */
OrefSet(this, this->savelist, new_identity_table());
/* allocate global control tables */
OrefSet(this, this->control, new_queue());
OrefSet(this, this->terms, new_queue());
OrefSet(this, this->subTerms, new_queue());
OrefSet(this, this->operators, new_queue());
OrefSet(this, this->literals, new_directory());
// during an image build, we have a global string table. If this is
// available now, use it.
OrefSet(this, this->strings, memoryObject.getGlobalStrings());
if (this->strings == OREF_NULL)
{
// no global string table, use a local copy
OrefSet(this, this->strings, new_directory());
}
/* get the clause object */
OrefSet(this, this->clause, new RexxClause());
}
RexxCode *RexxSource::generateCode(bool isMethod)
/******************************************************************************/
/* Function: Convert a source object into an executable method */
/******************************************************************************/
{
this->globalSetup(); /* do the global setup part */
/* translate the source program */
RexxCode *newCode = this->translate(OREF_NULL);
ProtectedObject p(newCode);
this->cleanup(); /* release temporary tables */
// if generating a method object, then process the directive installation now
if (isMethod)
{
// force this to install now
install();
}
return newCode; /* return the method */
}
RexxCode *RexxSource::interpretMethod(
RexxDirectory *_labels ) /* parent label set */
/******************************************************************************/
/* Function: Convert a source object into an executable interpret method */
/******************************************************************************/
{
this->globalSetup(); /* do the global setup part */
this->flags |= _interpret; /* this is an interpret */
RexxCode *newCode = this->translate(_labels); /* translate the source program */
ProtectedObject p(newCode);
this->cleanup(); /* release temporary tables */
return newCode; /* return the method */
}
RexxCode *RexxSource::interpret(
RexxString *string, /* interpret string value */
RexxDirectory *_labels, /* parent labels */
size_t _line_number ) /* line number of interpret */
/******************************************************************************/
/* Function: Interpret a string in the current activation context */
/******************************************************************************/
{
/* create a source object */
RexxSource *source = new RexxSource (this->programName, new_array(string));
ProtectedObject p(source);
source->interpretLine(_line_number); /* fudge the line numbering */
/* convert to executable form */
return source->interpretMethod(_labels);
}
void RexxSource::checkDirective(int errorCode)
/******************************************************************************/
/* Function: Verify that no code follows a directive except for more */
/* directive instructions. */
/******************************************************************************/
{
// save the clause location so we can reset for errors
SourceLocation location = clauseLocation;
this->nextClause(); /* get the next clause */
/* have a next clause? */
if (!(this->flags&no_clause))
{
RexxToken *token = nextReal(); /* get the first token */
/* not a directive start? */
if (token->classId != TOKEN_DCOLON)
{
/* this is an error */
syntaxError(errorCode);
}
firstToken(); /* reset to the first token */
this->reclaimClause(); /* give back to the source object */
}
// this resets the current clause location so that any errors on the current
// clause detected after the clause check reports this on the correct line
// number
clauseLocation = location;
}
/**
* Test if a directive is followed by a body of Rexx code
* instead of another directive or the end of the source.
*
* @return True if there is a non-directive clause following the current
* clause.
*/
bool RexxSource::hasBody()
{
// assume there's no body here
bool result = false;
// if we have anything to look at, see if it is a directive or not.
this->nextClause();
if (!(this->flags&no_clause))
{
// we have a clause, now check if this is a directive or not
RexxToken *token = nextReal();
// not a "::", not a directive, which means we have real code to deal with
result = token->classId != TOKEN_DCOLON;
// reset this clause entirely so we can start parsing for real.
firstToken();
this->reclaimClause();
}
return result;
}
RexxObject *RexxSource::toss(
RexxObject *object) /* object to "release" */
/******************************************************************************/
/* Function: Remove an object from the save list */
/******************************************************************************/
{
/* have a real object */
if (object != OREF_NULL)
{
this->savelist->remove(object); /* remove from the save table */
this->holdObject(object); /* return this object as held */
}
return object; /* return the object */
}
void RexxSource::cleanup()
/******************************************************************************/
/* Function: Final cleanup after parsing */
/******************************************************************************/
{
/* global area cleanup */
/* release the holding pen */
OrefSet(this, this->holdstack, OREF_NULL);
/* release any saved objects */
OrefSet(this, this->savelist, OREF_NULL);
OrefSet(this, this->literals, OREF_NULL);
OrefSet(this, this->strings, OREF_NULL);
OrefSet(this, this->clause, OREF_NULL);
OrefSet(this, this->control, OREF_NULL);
OrefSet(this, this->terms, OREF_NULL);
OrefSet(this, this->subTerms, OREF_NULL);
OrefSet(this, this->operators, OREF_NULL);
OrefSet(this, this->class_dependencies, OREF_NULL);
OrefSet(this, this->active_class, OREF_NULL);
/* now method parsing areas */
OrefSet(this, this->calls, OREF_NULL);
OrefSet(this, this->variables, OREF_NULL);
OrefSet(this, this->guard_variables, OREF_NULL);
OrefSet(this, this->exposed_variables, OREF_NULL);
OrefSet(this, this->labels, OREF_NULL);
OrefSet(this, this->first, OREF_NULL);
OrefSet(this, this->last, OREF_NULL);
OrefSet(this, this->currentInstruction, OREF_NULL);
}
/**
* Merge a parent source context into our context so all of the
* bits that are visible in the parent are also resolvable in our
* context. This is mostly used for dynamically created methods.
*
* @param parent The parent source context.
*/
void RexxSource::inheritSourceContext(RexxSource *source)
{
// set this as a parent
OrefSet(this, this->parentSource, source);
}
void RexxSource::mergeRequired(RexxSource *source)
/******************************************************************************/
/* Function: Merge all public class and routine information from a called */
/* program into the full public information of this program. */
/******************************************************************************/
{
// has the source already merged in some public routines? pull those in first,
// so that the direct set will override
if (source->merged_public_routines != OREF_NULL)
{
/* first merged attempt? */
if (this->merged_public_routines == OREF_NULL)
{
/* get the directory */
OrefSet(this, this->merged_public_routines, new_directory());
}
/* loop through the list of routines */
for (HashLink i = source->merged_public_routines->first(); source->merged_public_routines->available(i); i = source->merged_public_routines->next(i))
{
/* copy the routine over */
this->merged_public_routines->setEntry((RexxString *)source->merged_public_routines->index(i), source->merged_public_routines->value(i));
}
}
// now process the direct set
if (source->public_routines != OREF_NULL)
{
/* first merged attempt? */
if (this->merged_public_routines == OREF_NULL)
{
/* get the directory */
OrefSet(this, this->merged_public_routines, new_directory());
}
/* loop through the list of routines */
for (HashLink i = source->public_routines->first(); source->public_routines->available(i); i = source->public_routines->next(i))
{
/* copy the routine over */
this->merged_public_routines->setEntry((RexxString *)source->public_routines->index(i), source->public_routines->value(i));
}
}
// now do the same process for any of the class contexts
if (source->merged_public_classes != OREF_NULL)
{
if (this->merged_public_classes == OREF_NULL)
{
/* get the directory */
OrefSet(this, this->merged_public_classes, new_directory());
}
/* loop through the list of classes, */
for (HashLink i = source->merged_public_classes->first(); source->merged_public_classes->available(i); i = source->merged_public_classes->next(i))
{
/* copy the routine over */
this->merged_public_classes->setEntry((RexxString *)source->merged_public_classes->index(i), source->merged_public_classes->value(i));
}
}
// the installed ones are processed second as they will overwrite the imported one, which
// is the behaviour we want
if (source->installed_public_classes != OREF_NULL)
{
if (this->merged_public_classes == OREF_NULL)
{
/* get the directory */
OrefSet(this, this->merged_public_classes, new_directory());
}
/* loop through the list of classes, */
for (HashLink i = source->installed_public_classes->first(); source->installed_public_classes->available(i); i = source->installed_public_classes->next(i))
{
/* copy the routine over */
this->merged_public_classes->setEntry((RexxString *)source->installed_public_classes->index(i), source->installed_public_classes->value(i));
}
}
}
/**
* Resolve a directly defined class object in this or a parent
* context.
*
* @param name The name we're searching for (all uppercase).
*
* @return A resolved class object, if found.
*/
RoutineClass *RexxSource::findLocalRoutine(RexxString *name)
{
// if we have one locally, then return it.
if (this->routines != OREF_NULL)
{
/* try for a local one first */
RoutineClass *result = (RoutineClass *)(this->routines->fastAt(name));
if (result != OREF_NULL)
{
return result;
}
}
// we might have a chained context, so check it also
if (parentSource != OREF_NULL)
{
return parentSource->findLocalRoutine(name);
}
// nope, no got one
return OREF_NULL;
}
/**
* Resolve a public routine in this source context
*
* @param name The target name.
*
* @return A resolved Routine object, if found.
*/
RoutineClass *RexxSource::findPublicRoutine(RexxString *name)
{
// if we have one locally, then return it.
if (this->merged_public_routines != OREF_NULL)
{
/* try for a local one first */
RoutineClass *result = (RoutineClass *)(this->merged_public_routines->fastAt(name));
if (result != OREF_NULL)
{
return result;
}
}
// we might have a chained context, so check it also
if (parentSource != OREF_NULL)
{
return parentSource->findPublicRoutine(name);
}
// nope, no got one
return OREF_NULL;
}
/**
* Resolve a routine from this source files base context.
*
* @param routineName
* The routine name of interest.
*
* @return A RoutineClass instance if located. Returns OREF_NULL if this
* is not known at this level.
*/
RoutineClass *RexxSource::findRoutine(RexxString *routineName)
{
// These lookups are case insensive, so the table are all created using the opper
// case names. Use it once and reuse it.
RexxString *upperName = routineName->upper();
ProtectedObject p1(upperName);
RoutineClass *routineObject = findLocalRoutine(upperName);
if (routineObject != OREF_NULL)
{
return routineObject;
}
// now try for one pulled in from ::REQUIRES objects
return findPublicRoutine(upperName);
}
/**
* Resolve an external call in the context of the program making the
* call. This will use the directory and extension of the context
* program to modify the search order.
*
* @param activity The current activity
* @param name The target name
*
* @return The fully resolved string name of the target program, if one is
* located.
*/
RexxString *RexxSource::resolveProgramName(RexxActivity *activity, RexxString *name)
{
return activity->getInstance()->resolveProgramName(name, programDirectory, programExtension);
}
/**
* Resolve a directly defined class object in this or a parent
* context.
*
* @param name The name we're searching for (all uppercase).
*
* @return A resolved class object, if found.
*/
RexxClass *RexxSource::findInstalledClass(RexxString *name)
{
// if we have one locally, then return it.
if (this->installed_classes != OREF_NULL)
{
/* try for a local one first */
RexxClass *result = (RexxClass *)(this->installed_classes->fastAt(name));
if (result != OREF_NULL)
{
return result;
}
}
// we might have a chained context, so check it also
if (parentSource != OREF_NULL)
{
return parentSource->findInstalledClass(name);
}
// nope, no got one
return OREF_NULL;
}
RexxClass *RexxSource::findPublicClass(RexxString *name)
{
// if we have one locally, then return it.
if (this->merged_public_classes != OREF_NULL)
{
/* try for a local one first */
RexxClass *result = (RexxClass *)(this->merged_public_classes->fastAt(name));
if (result != OREF_NULL)
{
return result;
}
}
// we might have a chained context, so check it also
if (parentSource != OREF_NULL)
{
return parentSource->findPublicClass(name);
}
// nope, no got one
return OREF_NULL;
}
/**
* Resolve a class from this source file context (including any
* chained parent contexts).
*
* @param className The target name of the class.
*
* @return The resolved class object, if any.
*/
RexxClass *RexxSource::findClass(RexxString *className)
{
RexxString *internalName = className->upper(); /* upper case it */
// check for a directly defined one in the source context chain
RexxClass *classObject = findInstalledClass(internalName);
// return if we got one
if (classObject != OREF_NULL)
{
return classObject;
}
// now try for public classes we pulled in from other contexts
classObject = findPublicClass(internalName);
// return if we got one
if (classObject != OREF_NULL)
{
return classObject;
}
// give the security manager a go
if (this->securityManager != OREF_NULL)
{
classObject = (RexxClass *)securityManager->checkLocalAccess(internalName);
if (classObject != OREF_NULL)
{
return classObject;
}
}
/* send message to .local */
classObject = (RexxClass *)(ActivityManager::getLocalEnvironment(internalName));
if (classObject != OREF_NULL)
{
return classObject;
}
/* normal execution? */
if (this->securityManager != OREF_NULL)
{
classObject = (RexxClass *)securityManager->checkEnvironmentAccess(internalName);
if (classObject != OREF_NULL)
{
return classObject;
}
}
/* last chance, try the environment */
return(RexxClass *)(TheEnvironment->at(internalName));
}
/**
* Perform a non-contextual install of a package.
*/
void RexxSource::install()
{
if (needsInstallation())
{
// In order to install, we need to call something. We manage this by
// creating a dummy stub routine that we can call to force things to install
RexxCode *stub = new RexxCode(this, OREF_NULL, OREF_NULL, 10, FIRST_VARIABLE_INDEX);
ProtectedObject p2(stub);
RoutineClass *code = new RoutineClass(programName, stub);
p2 = code;
ProtectedObject dummy;
code->call(ActivityManager::currentActivity, programName, NULL, 0, dummy);
}
}
void RexxSource::processInstall(
RexxActivation *activation) /* invoking activation */
/******************************************************************************/
/* Function: Process directive information contained within a method, calling*/
/* all ::requires routines, creating all ::class methods, and */
/* processing all ::routines. */
/******************************************************************************/
{
/* turn the install flag off */
/* immediately, otherwise we may */
/* run into a recursion problem */
/* when class init methods are */
/* processed */
this->flags &= ~_install; /* we are now installed */
// native packages are processed first. The requires might actually need
// functons loaded by the packages
if (this->libraries != OREF_NULL)
{
/* classes and routines */
// now loop through the requires items
for (size_t i = libraries->firstIndex(); i != LIST_END; i = libraries->nextIndex(i))
{
// and have it do the installs processing
LibraryDirective *library = (LibraryDirective *)this->libraries->getValue(i);
library->install(activation);
}
}
// native methods and routines are lazy resolved on first use, so we don't
// need to process them here.
if (this->requires != OREF_NULL) /* need to process ::requires? */
{
/* classes and routines */
// now loop through the requires items
for (size_t i = requires->firstIndex(); i != LIST_END; i = requires->nextIndex(i))
{
// and have it do the installs processing. This is a little roundabout, but
// we end up back in our own context while processing this, and the merge
// of the information happens then.
RequiresDirective *_requires = (RequiresDirective *)this->requires->getValue(i);
_requires->install(activation);
}
}
// and finally process classes
if (this->classes != OREF_NULL)
{
/* get an installed classes directory*/
OrefSet(this, this->installed_classes, new_directory());
/* and the public classes */
OrefSet(this, this->installed_public_classes, new_directory());
RexxArray *createdClasses = new_array(classes->items());
ProtectedObject p(createdClasses);
size_t index = 1; // used for keeping track of install order
for (size_t i = classes->firstIndex(); i != LIST_END; i = classes->nextIndex(i))
{
/* get the class info */
ClassDirective *current_class = (ClassDirective *)this->classes->getValue(i);
// save the newly created class in our array so we can send the activate
// message at the end
RexxClass *newClass = current_class->install(this, activation);
createdClasses->put(newClass, index++);
}
// now send an activate message to each of these classes
for (size_t j = 1; j < index; j++)
{
RexxClass *clz = (RexxClass *)createdClasses->get(j);
clz->sendMessage(OREF_ACTIVATE);
}
}
}
RexxCode *RexxSource::translate(
RexxDirectory *_labels) /* interpret labels */
/******************************************************************************/
/* Function: Translate a source object into a method object */
/******************************************************************************/
{
ParseActivationFrame frame(ActivityManager::currentActivity, this);
// set up the package global defaults
digits = Numerics::DEFAULT_DIGITS;
form = Numerics::DEFAULT_FORM;
fuzz = Numerics::DEFAULT_FUZZ;
traceSetting = DEFAULT_TRACE_SETTING;
traceFlags = RexxActivation::default_trace_flags;
/* go translate the lead block */
RexxCode *newMethod = this->translateBlock(_labels);
// we save this in case we need to explicitly run this at install time
OrefSet(this, this->initCode, newMethod);
if (!this->atEnd()) /* have directives to process? */
{
/* create the routines directory */
OrefSet(this, this->routines, new_directory());
/* create the routines directory */
OrefSet(this, this->public_routines, new_directory());
/* and a directory of dependencies */
OrefSet(this, this->class_dependencies, new_directory());
/* create the requires directory */
OrefSet(this, this->requires, new_list());
// and a list of load libraries requiring loading.
OrefSet(this, this->libraries, new_list());
/* create the classes list */
OrefSet(this, this->classes, new_list());
/* no active class definition */
OrefSet(this, this->active_class, OREF_NULL);
/* translation stopped by a directive*/
if (this->flags&_interpret) /* is this an interpret? */
{
this->nextClause(); /* get the directive clause */
/* raise an error */
syntaxError(Error_Translation_directive_interpret);
}
/* create a directory for ..methods */
OrefSet(this, this->methods, new_directory());
while (!this->atEnd()) /* loop until end of source */
{
this->directive(); /* process the directive */
}
this->resolveDependencies(); /* go resolve class dependencies */
}
return newMethod; /* return the method */
}
void RexxSource::resolveDependencies()
/*********************************************************************/
/* Function: Resolve dependencies between ::CLASS directives, */
/* rearranging the order of the directives to preserve */
/* relative ordering wherever possible. Classes with no */
/* dependencies in this source file will be done first, */
/* followed by those with dependencies in the appropriate */
/* order */
/*********************************************************************/
{
// get our class list
if (classes->items() == 0) /* nothing to process? */
{
/* clear out the classes list */
OrefSet(this, this->classes, OREF_NULL);
}
else /* have classes to process */
{
size_t i;
// run through the class list having each directive set up its
// dependencies
for (i = classes->firstIndex(); i != LIST_END; i = classes->nextIndex(i))
{
/* get the next class */
ClassDirective *current_class = (ClassDirective *)(classes->getValue(i));
// have the class figure out it's in-package dependencies
current_class->addDependencies(class_dependencies);
}
RexxList *class_order = new_list(); // get a list for doing the order
ProtectedObject p(class_order);
/* now we repeatedly scan the pending directory looking for a class */
/* with no in-program dependencies - it's an error if there isn't one */
/* as we build the classes we have to remove them (their names) from */
/* pending list and from the remaining dependencies */
while (classes->items() > 0)
{
// this is the next one we process
ClassDirective *next_install = OREF_NULL;
for (i = classes->firstIndex(); i != LIST_END; i = classes->nextIndex(i))
{
/* get the next class */
ClassDirective *current_class = (ClassDirective *)(classes->getValue(i));
// if this class doesn't have any additional dependencies, pick it next.
if (current_class->dependenciesResolved())
{
next_install = current_class;
// add this to the class ordering
class_order->append((RexxObject *)next_install);
// remove this from the processing list
classes->removeIndex(i);
}
}
if (next_install == OREF_NULL) /* nothing located? */
{
// directive line where we can give as the source of the error
ClassDirective *error_class = (ClassDirective *)(classes->getValue(classes->firstIndex()));
clauseLocation = error_class->getLocation();
/* raise an error */
syntaxError(Error_Execution_cyclic, this->programName);
}
RexxString *class_name = next_install->getName();
// now go through the pending list telling each of the remaining classes that
// they can remove this dependency from their list
for (i = classes->firstIndex(); i != LIST_END; i = classes->nextIndex(i))
{ /* go remove the dependencies */
/* get a class */
ClassDirective *current_class = (ClassDirective *)classes->getValue(i);
current_class->removeDependency(class_name);
}
}
/* replace the original class list */
OrefSet(this, this->classes, class_order);
/* don't need the dependencies now */
OrefSet(this, this->class_dependencies, OREF_NULL);
}
if (this->requires->items() == 0) /* nothing there? */
{
/* just clear it out */
OrefSet(this, this->requires, OREF_NULL);
}
if (this->libraries->items() == 0) /* nothing there? */
{
/* just clear it out */
OrefSet(this, this->libraries, OREF_NULL);
}
if (this->routines->items() == 0) /* no routines to process? */
{
/* just clear it out also */
OrefSet(this, this->routines, OREF_NULL);
}
/* now finally the public routines */
if (this->public_routines->items() == 0)
{
/* just clear it out also */
OrefSet(this, this->public_routines, OREF_NULL);
}
if (this->methods->items() == 0) /* and also the methods directory */
{
/* just clear it out also */
OrefSet(this, this->methods, OREF_NULL);
}
}
#define DEFAULT_GUARD 0 /* using defualt guarding */
#define GUARDED_METHOD 1 /* method is a guarded one */
#define UNGUARDED_METHOD 2 /* method is unguarded */
#define DEFAULT_PROTECTION 0 /* using defualt protection */
#define PROTECTED_METHOD 1 /* security manager permission needed*/
#define UNPROTECTED_METHOD 2 /* no protection. */
#define DEFAULT_ACCESS_SCOPE 0 /* using defualt scope */
#define PUBLIC_SCOPE 1 /* publicly accessible */
#define PRIVATE_SCOPE 2 /* private scope */
/**
* Process a ::CLASS directive for a source file.
*/
void RexxSource::classDirective()
{
RexxToken *token = nextReal(); /* get the next token */
/* not a symbol or a string */
if (!token->isSymbolOrLiteral())
{
/* report an error */
syntaxError(Error_Symbol_or_string_class);
}
RexxString *name = token->value; /* get the routine name */
/* get the exposed name version */
RexxString *public_name = this->commonString(name->upper());
/* does this already exist? */
if (this->class_dependencies->entry(public_name) != OREF_NULL)
{
/* have an error here */
syntaxError(Error_Translation_duplicate_class);
}
/* create a dependencies list */
this->flags |= _install; /* have information to install */
// create a class directive and add this to the dependency list
OrefSet(this, this->active_class, new ClassDirective(name, public_name, this->clause));
this->class_dependencies->put((RexxObject *)active_class, public_name);
// and also add to the classes list
this->classes->append((RexxObject *)this->active_class);
int Public = DEFAULT_ACCESS_SCOPE; /* haven't seen the keyword yet */
for (;;)
{ /* now loop on the option keywords */
token = nextReal(); /* get the next token */
/* reached the end? */
if (token->isEndOfClause())
{
break; /* get out of here */
}
/* not a symbol token? */
else if (!token->isSymbol())
{
/* report an error */
syntaxError(Error_Invalid_subkeyword_class, token);
}
else
{ /* have some sort of option keyword */
/* get the keyword type */
int type = this->subDirective(token);
switch (type)
{ /* process each sub keyword */
/* ::CLASS name METACLASS metaclass */
case SUBDIRECTIVE_METACLASS:
/* already had a METACLASS? */
if (active_class->getMetaClass() != OREF_NULL)
{
syntaxError(Error_Invalid_subkeyword_class, token);
}
token = nextReal(); /* get the next token */
/* not a symbol or a string */
if (!token->isSymbolOrLiteral())
{
/* report an error */
syntaxError(Error_Symbol_or_string_metaclass, token);
}
/* tag the active class */
this->active_class->setMetaClass(token->value);
break;
case SUBDIRECTIVE_PUBLIC: /* ::CLASS name PUBLIC */
if (Public != DEFAULT_ACCESS_SCOPE) /* already had one of these? */
{
/* duplicates are invalid */
syntaxError(Error_Invalid_subkeyword_class, token);
}
Public = PUBLIC_SCOPE; /* turn on the seen flag */
/* just set this as a public object */
this->active_class->setPublic();
break;
case SUBDIRECTIVE_PRIVATE: /* ::CLASS name PUBLIC */
if (Public != DEFAULT_ACCESS_SCOPE) /* already had one of these? */
{
/* duplicates are invalid */
syntaxError(Error_Invalid_subkeyword_class, token);
}
Public = PRIVATE_SCOPE; /* turn on the seen flag */
break;
/* ::CLASS name SUBCLASS sclass */
case SUBDIRECTIVE_SUBCLASS:
// If we have a subclass set already, this is an error
if (active_class->getSubClass() != OREF_NULL)
{
/* duplicates are invalid */
syntaxError(Error_Invalid_subkeyword_class, token);
}
token = nextReal(); /* get the next token */
/* not a symbol or a string */
if (!token->isSymbolOrLiteral())
{
/* report an error */
syntaxError(Error_Symbol_or_string_subclass);
}
/* set the subclass information */
this->active_class->setSubClass(token->value);
break;
/* ::CLASS name MIXINCLASS mclass */
case SUBDIRECTIVE_MIXINCLASS:
// If we have a subclass set already, this is an error
if (active_class->getSubClass() != OREF_NULL)
{
/* duplicates are invalid */
syntaxError(Error_Invalid_subkeyword_class, token);
}
token = nextReal(); /* get the next token */
/* not a symbol or a string */
if (!token->isSymbolOrLiteral())
{
/* report an error */
syntaxError(Error_Symbol_or_string_mixinclass);
}
/* set the subclass information */
this->active_class->setMixinClass(token->value);
break;
/* ::CLASS name INHERIT iclasses */
case SUBDIRECTIVE_INHERIT:
token = nextReal(); /* get the next token */
/* nothing after the keyword? */
if (token->isEndOfClause())
{
/* report an error */
syntaxError(Error_Symbol_or_string_inherit, token);
}
while (!token->isEndOfClause())
{
/* not a symbol or a string */
if (!token->isSymbolOrLiteral())
{
/* report an error */
syntaxError(Error_Symbol_or_string_inherit, token);
}
/* add to the inherit list */
this->active_class->addInherits(token->value);
token = nextReal(); /* step to the next token */
}
previousToken(); /* step back a token */
break;
default: /* invalid keyword */
/* this is an error */
syntaxError(Error_Invalid_subkeyword_class, token);
break;
}
}
}
}
/**
* check for a duplicate method.
*
* @param name The name to check.
* @param classMethod
* Indicates whether this is a check for a CLASS or INSTANCE method.
* @param errorMsg
* The error code to use if there is a duplicate.
*/
void RexxSource::checkDuplicateMethod(RexxString *name, bool classMethod, int errorMsg)
{
/* no previous ::CLASS directive? */
if (this->active_class == OREF_NULL)
{
if (classMethod) /* supposed to be a class method? */
{
/* this is an error */
syntaxError(Error_Translation_missing_class);
}
/* duplicate method name? */
if (this->methods->entry(name) != OREF_NULL)
{
/* this is an error */
syntaxError(errorMsg);
}
}
else
{ /* add the method to the active class*/
if (active_class->checkDuplicateMethod(name, classMethod))
{
/* this is an error */
syntaxError(errorMsg);
}
}
}
/**
* Add a new method to this compilation.
*
* @param name The directory name of the method.
* @param method The method object.
* @param classMethod
* The class/instance method indicator.
*/
void RexxSource::addMethod(RexxString *name, RexxMethod *method, bool classMethod)
{
if (this->active_class == OREF_NULL)
{
this->methods->setEntry(name, method);
}
else
{
active_class->addMethod(name, method, classMethod);
}
}
/**
* Process a ::METHOD directive in a source file.
*/
void RexxSource::methodDirective()
{
int Private = DEFAULT_ACCESS_SCOPE; /* this is a public method */
int Protected = DEFAULT_PROTECTION; /* and is not protected yet */
int guard = DEFAULT_GUARD; /* default is guarding */
bool Class = false; /* default is an instance method */
bool Attribute = false; /* init Attribute flag */
bool abstractMethod = false; // this is an abstract method
RexxToken *token = nextReal(); /* get the next token */
RexxString *externalname = OREF_NULL; /* not an external method yet */
/* not a symbol or a string */
if (!token->isSymbolOrLiteral())
{
/* report an error */
syntaxError(Error_Symbol_or_string_method, token);
}
RexxString *name = token->value; /* get the string name */
/* and the name form also */
RexxString *internalname = this->commonString(name->upper());
for (;;)
{ /* now loop on the option keywords */
token = nextReal(); /* get the next token */
/* reached the end? */
if (token->isEndOfClause())
{
break; /* get out of here */
}
/* not a symbol token? */
else if (!token->isSymbol())
{
/* report an error */
syntaxError(Error_Invalid_subkeyword_method, token);
}
else
{ /* have some sort of option keyword */
/* process each sub keyword */
switch (this->subDirective(token))
{
/* ::METHOD name CLASS */
case SUBDIRECTIVE_CLASS:
if (Class) /* had one of these already? */
{
/* duplicates are invalid */
syntaxError(Error_Invalid_subkeyword_method, token);
}
Class = true; /* flag this for later processing */
break;
/* ::METHOD name EXTERNAL extname */
case SUBDIRECTIVE_EXTERNAL:
/* already had an external? */
if (externalname != OREF_NULL || abstractMethod)
{
/* duplicates are invalid */
syntaxError(Error_Invalid_subkeyword_method, token);
}
token = nextReal(); /* get the next token */
/* not a string? */
if (!token->isLiteral())
{
/* report an error */
syntaxError(Error_Symbol_or_string_external, token);
}
externalname = token->value;
break;
/* ::METHOD name PRIVATE */
case SUBDIRECTIVE_PRIVATE:
if (Private != DEFAULT_ACCESS_SCOPE) /* already seen one of these? */
{
/* duplicates are invalid */
syntaxError(Error_Invalid_subkeyword_method, token);
}
Private = PRIVATE_SCOPE; /* flag for later processing */
break;
/* ::METHOD name PUBLIC */
case SUBDIRECTIVE_PUBLIC:
if (Private != DEFAULT_ACCESS_SCOPE) /* already seen one of these? */
{
/* duplicates are invalid */
syntaxError(Error_Invalid_subkeyword_method, token);
}
Private = PUBLIC_SCOPE; /* flag for later processing */
break;
/* ::METHOD name PROTECTED */
case SUBDIRECTIVE_PROTECTED:
if (Protected != DEFAULT_PROTECTION) /* already seen one of these? */
{
/* duplicates are invalid */
syntaxError(Error_Invalid_subkeyword_method, token);
}
Protected = PROTECTED_METHOD; /* flag for later processing */
break;
/* ::METHOD name UNPROTECTED */
case SUBDIRECTIVE_UNPROTECTED:
if (Protected != DEFAULT_PROTECTION) /* already seen one of these? */
{
/* duplicates are invalid */
syntaxError(Error_Invalid_subkeyword_method, token);
}
Protected = UNPROTECTED_METHOD; /* flag for later processing */
break;
/* ::METHOD name UNGUARDED */
case SUBDIRECTIVE_UNGUARDED:
/* already seen one of these? */
if (guard != DEFAULT_GUARD)
{
/* duplicates are invalid */
syntaxError(Error_Invalid_subkeyword_method, token);
}
guard = UNGUARDED_METHOD;/* flag for later processing */
break;
/* ::METHOD name GUARDED */
case SUBDIRECTIVE_GUARDED:
/* already seen one of these? */
if (guard != DEFAULT_GUARD)
{
/* duplicates are invalid */
syntaxError(Error_Invalid_subkeyword_method, token);
}
guard = GUARDED_METHOD; /* flag for later processing */
break;
/* ::METHOD name ATTRIBUTE */
case SUBDIRECTIVE_ATTRIBUTE:
if (Attribute) /* already seen one of these? */
{
/* duplicates are invalid */
syntaxError(Error_Invalid_subkeyword_method, token);
}
// cannot have an abstract attribute
if (abstractMethod)
{
/* EXTERNAL and ATTRIBUTE are */
/* mutually exclusive */
syntaxError(Error_Invalid_subkeyword_method, token);
}
Attribute = true; /* flag for later processing */
break;
/* ::METHOD name ABSTRACT */
case SUBDIRECTIVE_ABSTRACT:
if (abstractMethod || externalname != OREF_NULL)
{
syntaxError(Error_Invalid_subkeyword_method, token);
}
// not compatible with ATTRIBUTE or EXTERNAL
if (externalname != OREF_NULL || Attribute)
{
syntaxError(Error_Invalid_subkeyword_method, token);
}
abstractMethod = true; /* flag for later processing */
break;
default: /* invalid keyword */
/* this is an error */
syntaxError(Error_Invalid_subkeyword_method, token);
break;
}
}
}
// go check for a duplicate and validate the use of the CLASS modifier
checkDuplicateMethod(internalname, Class, Error_Translation_duplicate_method);
RexxMethod *_method = OREF_NULL;
// is this an attribute method?
if (Attribute)
{
// now get this as the setter method.
RexxString *setterName = commonString(internalname->concatWithCstring("="));
// need to check for duplicates on that too
checkDuplicateMethod(setterName, Class, Error_Translation_duplicate_method);
/* Go check the next clause to make */
this->checkDirective(Error_Translation_attribute_method); /* sure that no code follows */
// this might be externally defined setters and getters.
if (externalname != OREF_NULL)
{
RexxString *library = OREF_NULL;
RexxString *procedure = OREF_NULL;
decodeExternalMethod(internalname, externalname, library, procedure);
// now create both getter and setting methods from the information.
_method = createNativeMethod(internalname, library, procedure->concatToCstring("GET"));
_method->setAttributes(Private == PRIVATE_SCOPE, Protected == PROTECTED_METHOD, guard != UNGUARDED_METHOD);
// add to the compilation
addMethod(internalname, _method, Class);
_method = createNativeMethod(setterName, library, procedure->concatToCstring("SET"));
_method->setAttributes(Private == PRIVATE_SCOPE, Protected == PROTECTED_METHOD, guard != UNGUARDED_METHOD);
// add to the compilation
addMethod(setterName, _method, Class);
}
else
{
// now get a variable retriever to get the property
RexxVariableBase *retriever = this->getRetriever(name);
// create the method pair and quit.
createAttributeGetterMethod(internalname, retriever, Class, Private == PRIVATE_SCOPE,
Protected == PROTECTED_METHOD, guard != UNGUARDED_METHOD);
createAttributeSetterMethod(setterName, retriever, Class, Private == PRIVATE_SCOPE,
Protected == PROTECTED_METHOD, guard != UNGUARDED_METHOD);
}
return;
}
// abstract method?
else if (abstractMethod)
{
/* Go check the next clause to make */
this->checkDirective(Error_Translation_abstract_method); /* sure that no code follows */
// this uses a special code block
BaseCode *code = new AbstractCode();
_method = new RexxMethod(name, code);
}
/* not an external method? */
else if (externalname == OREF_NULL)
{
// NOTE: It is necessary to translate the block and protect the code
// before allocating the RexxMethod object. The new operator allocates the
// the object first, then evaluates the constructor arguments after the allocation.
// Since the translateBlock() call will allocate a lot of new objects before returning,
// there's a high probability that the method object can get garbage collected before
// there is any opportunity to protect the object.
RexxCode *code = this->translateBlock(OREF_NULL);
this->saveObject((RexxObject *)code);
/* go do the next block of code */
_method = new RexxMethod(name, code);
}
else
{
RexxString *library = OREF_NULL;
RexxString *procedure = OREF_NULL;
decodeExternalMethod(internalname, externalname, library, procedure);
/* go check the next clause to make */
this->checkDirective(Error_Translation_external_method);
// and make this into a method object.
_method = createNativeMethod(name, library, procedure);
}
_method->setAttributes(Private == PRIVATE_SCOPE, Protected == PROTECTED_METHOD, guard != UNGUARDED_METHOD);
// add to the compilation
addMethod(internalname, _method, Class);
}
/**
* Process a ::OPTIONS directive in a source file.
*/
void RexxSource::optionsDirective()
{
// all options are of a keyword/value pattern
for (;;)
{
RexxToken *token = nextReal(); /* get the next token */
/* reached the end? */
if (token->isEndOfClause())
{
break; /* get out of here */
}
/* not a symbol token? */
else if (!token->isSymbol())
{
/* report an error */
syntaxError(Error_Invalid_subkeyword_options, token);
}
else
{ /* have some sort of option keyword */
/* process each sub keyword */
switch (this->subDirective(token))
{
// ::OPTIONS DIGITS nnnn
case SUBDIRECTIVE_DIGITS:
{
token = nextReal(); /* get the next token */
/* not a string? */
if (!token->isSymbolOrLiteral())
{
/* report an error */
syntaxError(Error_Symbol_or_string_digits_value, token);
}
RexxString *value = token->value; /* get the string value */
if (!value->requestUnsignedNumber(digits, number_digits()) || digits < 1)
{
/* report an exception */
syntaxError(Error_Invalid_whole_number_digits, value);
}
/* problem with the fuzz setting? */
if (digits <= fuzz)
{
/* this is an error */
reportException(Error_Expression_result_digits, digits, fuzz);
}
break;
}
// ::OPTIONS FORM ENGINEERING/SCIENTIFIC
case SUBDIRECTIVE_FORM:
token = nextReal(); /* get the next token */
/* not a string? */
if (!token->isSymbol())
{
/* report an error */
syntaxError(Error_Invalid_subkeyword_form, token);
}
/* resolve the subkeyword */
/* and process */
switch (this->subKeyword(token))
{
case SUBKEY_SCIENTIFIC: /* NUMERIC FORM SCIENTIFIC */
form = Numerics::FORM_SCIENTIFIC;
break;
case SUBKEY_ENGINEERING: /* NUMERIC FORM ENGINEERING */
form = Numerics::FORM_ENGINEERING;
break;
default: /* invalid subkeyword */
/* raise an error */
syntaxError(Error_Invalid_subkeyword_form, token);
break;
}
break;
// ::OPTIONS FUZZ nnnn
case SUBDIRECTIVE_FUZZ:
{
token = nextReal(); /* get the next token */
/* not a string? */
if (!token->isSymbolOrLiteral())
{
/* report an error */
syntaxError(Error_Symbol_or_string_fuzz_value, token);
}
RexxString *value = token->value; /* get the string value */
if (!value->requestUnsignedNumber(fuzz, number_digits()))
{
/* report an exception */
syntaxError(Error_Invalid_whole_number_fuzz, value);
}
/* problem with the digits setting? */
if (fuzz >= digits)
{
/* and issue the error */
reportException(Error_Expression_result_digits, digits, fuzz);
}
break;
}
// ::OPTIONS TRACE setting
case SUBDIRECTIVE_TRACE:
{
token = nextReal(); /* get the next token */
/* not a string? */
if (!token->isSymbolOrLiteral())
{
/* report an error */
syntaxError(Error_Symbol_or_string_trace_value, token);
}
RexxString *value = token->value; /* get the string value */
char badOption = 0;
/* process the setting */
if (!parseTraceSetting(value, traceSetting, traceFlags, badOption))
{
syntaxError(Error_Invalid_trace_trace, new_string(&badOption, 1));
}
break;
}
default: /* invalid keyword */
/* this is an error */
syntaxError(Error_Invalid_subkeyword_options, token);
break;
}
}
}
}
/**
* Create a native method from a specification.
*
* @param name The method name.
* @param library The library containing the method.
* @param procedure The name of the procedure within the package.
*
* @return A method object representing this method.
*/
RexxMethod *RexxSource::createNativeMethod(RexxString *name, RexxString *library, RexxString *procedure)
{
/* create a new native method */
RexxNativeCode *nmethod = PackageManager::resolveMethod(library, procedure);
// raise an exception if this entry point is not found.
if (nmethod == OREF_NULL)
{
syntaxError(Error_External_name_not_found_method, procedure);
}
// this might return a different object if this has been used already
nmethod = (RexxNativeCode *)nmethod->setSourceObject(this);
/* turn into a real method object */
return new RexxMethod(name, nmethod);
}
/**
* Decode an external library method specification.
*
* @param methodName The internal name of the method (uppercased).
* @param externalSpec
* The external specification string.
* @param library The returned library name.
* @param procedure The returned package name.
*/
void RexxSource::decodeExternalMethod(RexxString *methodName, RexxString *externalSpec, RexxString *&library, RexxString *&procedure)
{
// this is the default
procedure = methodName;
library = OREF_NULL;
/* convert external into words */
RexxArray *_words = this->words(externalSpec);
/* not 'LIBRARY library [entry]' form? */
if (((RexxString *)(_words->get(1)))->strCompare(CHAR_LIBRARY))
{
// full library with entry name version?
if (_words->size() == 3)
{
library = (RexxString *)_words->get(2);
procedure = (RexxString *)_words->get(3);
}
else if (_words->size() == 2)
{
library = (RexxString *)_words->get(2);
}
else // wrong number of tokens
{
/* this is an error */
syntaxError(Error_Translation_bad_external, externalSpec);
}
}
else
{
/* unknown external type */
syntaxError(Error_Translation_bad_external, externalSpec);
}
}
#define ATTRIBUTE_BOTH 0
#define ATTRIBUTE_GET 1
#define ATTRIBUTE_SET 2
/**
* Process a ::ATTRIBUTE directive in a source file.
*/
void RexxSource::attributeDirective()
{
int Private = DEFAULT_ACCESS_SCOPE; /* this is a public method */
int Protected = DEFAULT_PROTECTION; /* and is not protected yet */
int guard = DEFAULT_GUARD; /* default is guarding */
int style = ATTRIBUTE_BOTH; // by default, we create both methods for the attribute.
bool Class = false; /* default is an instance method */
bool abstractMethod = false; // by default, creating a concrete method
RexxToken *token = nextReal(); /* get the next token */
/* not a symbol or a string */
if (!token->isSymbolOrLiteral())
{
/* report an error */
syntaxError(Error_Symbol_or_string_attribute, token);
}
RexxString *name = token->value; /* get the string name */
/* and the name form also */
RexxString *internalname = this->commonString(name->upper());
RexxString *externalname = OREF_NULL;
for (;;)
{ /* now loop on the option keywords */
token = nextReal(); /* get the next token */
/* reached the end? */
if (token->isEndOfClause())
{
break; /* get out of here */
}
/* not a symbol token? */
else if (!token->isSymbol())
{
/* report an error */
syntaxError(Error_Invalid_subkeyword_attribute, token);
}
else
{ /* have some sort of option keyword */
/* process each sub keyword */
switch (this->subDirective(token))
{
case SUBDIRECTIVE_GET:
// only one of GET/SET allowed
if (style != ATTRIBUTE_BOTH)
{
syntaxError(Error_Invalid_subkeyword_attribute, token);
}
style = ATTRIBUTE_GET;
break;
case SUBDIRECTIVE_SET:
// only one of GET/SET allowed
if (style != ATTRIBUTE_BOTH)
{
syntaxError(Error_Invalid_subkeyword_attribute, token);
}
style = ATTRIBUTE_SET;
break;
/* ::ATTRIBUTE name CLASS */
case SUBDIRECTIVE_CLASS:
if (Class) /* had one of these already? */
{
/* duplicates are invalid */
syntaxError(Error_Invalid_subkeyword_attribute, token);
}
Class = true; /* flag this for later processing */
break;
case SUBDIRECTIVE_PRIVATE:
if (Private != DEFAULT_ACCESS_SCOPE) /* already seen one of these? */
{
/* duplicates are invalid */
syntaxError(Error_Invalid_subkeyword_attribute, token);
}
Private = PRIVATE_SCOPE; /* flag for later processing */
break;
/* ::METHOD name PUBLIC */
case SUBDIRECTIVE_PUBLIC:
if (Private != DEFAULT_ACCESS_SCOPE) /* already seen one of these? */
{
/* duplicates are invalid */
syntaxError(Error_Invalid_subkeyword_attribute, token);
}
Private = PUBLIC_SCOPE; /* flag for later processing */
break;
/* ::METHOD name PROTECTED */
case SUBDIRECTIVE_PROTECTED:
if (Protected != DEFAULT_PROTECTION) /* already seen one of these? */
{
/* duplicates are invalid */
syntaxError(Error_Invalid_subkeyword_attribute, token);
}
Protected = PROTECTED_METHOD; /* flag for later processing */
break;
case SUBDIRECTIVE_UNPROTECTED:
if (Protected != DEFAULT_PROTECTION) /* already seen one of these? */
{
/* duplicates are invalid */
syntaxError(Error_Invalid_subkeyword_attribute, token);
}
Protected = UNPROTECTED_METHOD; /* flag for later processing */
break;
/* ::METHOD name UNGUARDED */
case SUBDIRECTIVE_UNGUARDED:
/* already seen one of these? */
if (guard != DEFAULT_GUARD)
{
/* duplicates are invalid */
syntaxError(Error_Invalid_subkeyword_attribute, token);
}
guard = UNGUARDED_METHOD;/* flag for later processing */
break;
/* ::METHOD name GUARDED */
case SUBDIRECTIVE_GUARDED:
/* already seen one of these? */
if (guard != DEFAULT_GUARD)
{
/* duplicates are invalid */
syntaxError(Error_Invalid_subkeyword_attribute, token);
}
guard = GUARDED_METHOD; /* flag for later processing */
break;
/* ::METHOD name ATTRIBUTE */
case SUBDIRECTIVE_EXTERNAL:
/* already had an external? */
if (externalname != OREF_NULL || abstractMethod)
{
/* duplicates are invalid */
syntaxError(Error_Invalid_subkeyword_attribute, token);
}
token = nextReal(); /* get the next token */
/* not a string? */
if (!token->isLiteral())
{
/* report an error */
syntaxError(Error_Symbol_or_string_external, token);
}
externalname = token->value;
break;
/* ::METHOD name ABSTRACT */
case SUBDIRECTIVE_ABSTRACT:
if (abstractMethod || externalname != OREF_NULL)
{
syntaxError(Error_Invalid_subkeyword_attribute, token);
}
abstractMethod = true; /* flag for later processing */
break;
default: /* invalid keyword */
/* this is an error */
syntaxError(Error_Invalid_subkeyword_attribute, token);
break;
}
}
}
// both attributes same default properties?
// now get a variable retriever to get the property (do this before checking the body
// so errors get diagnosed on the correct line),
RexxVariableBase *retriever = this->getRetriever(name);
switch (style)
{
case ATTRIBUTE_BOTH:
{
checkDuplicateMethod(internalname, Class, Error_Translation_duplicate_attribute);
// now get this as the setter method.
RexxString *setterName = commonString(internalname->concatWithCstring("="));
checkDuplicateMethod(setterName, Class, Error_Translation_duplicate_attribute);
// no code can follow the automatically generated methods
this->checkDirective(Error_Translation_body_error);
if (externalname != OREF_NULL)
{
RexxString *library = OREF_NULL;
RexxString *procedure = OREF_NULL;
decodeExternalMethod(internalname, externalname, library, procedure);
// now create both getter and setting methods from the information.
RexxMethod *_method = createNativeMethod(internalname, library, procedure->concatToCstring("GET"));
_method->setAttributes(Private == PRIVATE_SCOPE, Protected == PROTECTED_METHOD, guard != UNGUARDED_METHOD);
// add to the compilation
addMethod(internalname, _method, Class);
_method = createNativeMethod(setterName, library, procedure->concatToCstring("SET"));
_method->setAttributes(Private == PRIVATE_SCOPE, Protected == PROTECTED_METHOD, guard != UNGUARDED_METHOD);
// add to the compilation
addMethod(setterName, _method, Class);
}
// abstract method?
else if (abstractMethod)
{
// create the method pair and quit.
createAbstractMethod(internalname, Class, Private == PRIVATE_SCOPE,
Protected == PROTECTED_METHOD, guard != UNGUARDED_METHOD);
createAbstractMethod(setterName, Class, Private == PRIVATE_SCOPE,
Protected == PROTECTED_METHOD, guard != UNGUARDED_METHOD);
}
else
{
// create the method pair and quit.
createAttributeGetterMethod(internalname, retriever, Class, Private == PRIVATE_SCOPE,
Protected == PROTECTED_METHOD, guard != UNGUARDED_METHOD);
createAttributeSetterMethod(setterName, retriever, Class, Private == PRIVATE_SCOPE,
Protected == PROTECTED_METHOD, guard != UNGUARDED_METHOD);
}
break;
}
case ATTRIBUTE_GET: // just the getter method
{
checkDuplicateMethod(internalname, Class, Error_Translation_duplicate_attribute);
// external? resolve the method
if (externalname != OREF_NULL)
{
// no code can follow external methods
this->checkDirective(Error_Translation_external_attribute);
RexxString *library = OREF_NULL;
RexxString *procedure = OREF_NULL;
decodeExternalMethod(internalname, externalname, library, procedure);
// if there was no procedure explicitly given, create one using the GET/SET convention
if (internalname == procedure)
{
procedure = procedure->concatToCstring("GET");
}
// now create both getter and setting methods from the information.
RexxMethod *_method = createNativeMethod(internalname, library, procedure);
_method->setAttributes(Private == PRIVATE_SCOPE, Protected == PROTECTED_METHOD, guard != UNGUARDED_METHOD);
// add to the compilation
addMethod(internalname, _method, Class);
}
// abstract method?
else if (abstractMethod)
{
// no code can follow abstract methods
this->checkDirective(Error_Translation_abstract_attribute);
// create the method pair and quit.
createAbstractMethod(internalname, Class, Private == PRIVATE_SCOPE,
Protected == PROTECTED_METHOD, guard != UNGUARDED_METHOD);
}
// either written in ooRexx or is automatically generated.
else {
if (hasBody())
{
createMethod(internalname, Class, Private == PRIVATE_SCOPE,
Protected == PROTECTED_METHOD, guard != UNGUARDED_METHOD);
}
else
{
createAttributeGetterMethod(internalname, retriever, Class, Private == PRIVATE_SCOPE,
Protected == PROTECTED_METHOD, guard != UNGUARDED_METHOD);
}
}
break;
}
case ATTRIBUTE_SET:
{
// now get this as the setter method.
RexxString *setterName = commonString(internalname->concatWithCstring("="));
checkDuplicateMethod(setterName, Class, Error_Translation_duplicate_attribute);
// external? resolve the method
if (externalname != OREF_NULL)
{
// no code can follow external methods
this->checkDirective(Error_Translation_external_attribute);
RexxString *library = OREF_NULL;
RexxString *procedure = OREF_NULL;
decodeExternalMethod(internalname, externalname, library, procedure);
// if there was no procedure explicitly given, create one using the GET/SET convention
if (internalname == procedure)
{
procedure = procedure->concatToCstring("SET");
}
// now create both getter and setting methods from the information.
RexxMethod *_method = createNativeMethod(setterName, library, procedure);
_method->setAttributes(Private == PRIVATE_SCOPE, Protected == PROTECTED_METHOD, guard != UNGUARDED_METHOD);
// add to the compilation
addMethod(setterName, _method, Class);
}
// abstract method?
else if (abstractMethod)
{
// no code can follow abstract methods
this->checkDirective(Error_Translation_abstract_attribute);
// create the method pair and quit.
createAbstractMethod(setterName, Class, Private == PRIVATE_SCOPE,
Protected == PROTECTED_METHOD, guard != UNGUARDED_METHOD);
}
else
{
if (hasBody()) // just the getter method
{
createMethod(setterName, Class, Private == PRIVATE_SCOPE,
Protected == PROTECTED_METHOD, guard != UNGUARDED_METHOD);
}
else
{
createAttributeSetterMethod(setterName, retriever, Class, Private == PRIVATE_SCOPE,
Protected == PROTECTED_METHOD, guard != UNGUARDED_METHOD);
}
}
break;
}
}
}
/**
* Process a ::CONSTANT directive in a source file.
*/
void RexxSource::constantDirective()
{
RexxToken *token = nextReal(); /* get the next token */
/* not a symbol or a string */
if (!token->isSymbolOrLiteral())
{
/* report an error */
syntaxError(Error_Symbol_or_string_constant, token);
}
RexxString *name = token->value; /* get the string name */
/* and the name form also */
RexxString *internalname = this->commonString(name->upper());
// we only expect just a single value token here
token = nextReal(); /* get the next token */
RexxObject *value;
/* not a symbol or a string */
if (!token->isSymbolOrLiteral())
{
// if not a "+" or "-" operator, this is an error
if (!token->isOperator() || (token->subclass != OPERATOR_SUBTRACT && token->subclass != OPERATOR_PLUS))
{
/* report an error */
syntaxError(Error_Symbol_or_string_constant_value, token);
}
RexxToken *second = nextReal();
// this needs to be a constant symbol...we check for
// numeric below
if (!second->isSymbol() || second->subclass != SYMBOL_CONSTANT)
{
/* report an error */
syntaxError(Error_Symbol_or_string_constant_value, token);
}
// concat with the sign operator
value = token->value->concat(second->value);
// and validate that this a valid number
if (value->numberString() == OREF_NULL)
{
/* report an error */
syntaxError(Error_Symbol_or_string_constant_value, token);
}
}
else
{
// this will be some sort of literal value
value = this->commonString(token->value);
}
token = nextReal(); /* get the next token */
// No other options on this instruction
if (!token->isEndOfClause())
{
/* report an error */
syntaxError(Error_Invalid_data_constant_dir, token);
}
// this directive does not allow a body
this->checkDirective(Error_Translation_constant_body);
// check for duplicates. We only do the class duplicate check if there
// is an active class, otherwise we'll get a syntax error
checkDuplicateMethod(internalname, false, Error_Translation_duplicate_constant);
if (this->active_class != OREF_NULL)
{
checkDuplicateMethod(internalname, true, Error_Translation_duplicate_constant);
}
// create the method pair and quit.
createConstantGetterMethod(internalname, value);
}
/**
* Create a Rexx method body.
*
* @param name The name of the attribute.
* @param classMethod
* Indicates whether we are creating a class or instance method.
* @param privateMethod
* The method's private attribute.
* @param protectedMethod
* The method's protected attribute.
* @param guardedMethod
* The method's guarded attribute.
*/
void RexxSource::createMethod(RexxString *name, bool classMethod,
bool privateMethod, bool protectedMethod, bool guardedMethod)
{
// NOTE: It is necessary to translate the block and protect the code
// before allocating the RexxMethod object. The new operator allocates the
// the object first, then evaluates the constructor arguments after the allocation.
// Since the translateBlock() call will allocate a lot of new objects before returning,
// there's a high probability that the method object can get garbage collected before
// there is any opportunity to protect the object.
RexxCode *code = this->translateBlock(OREF_NULL);
this->saveObject((RexxObject *)code);
/* go do the next block of code */
RexxMethod *_method = new RexxMethod(name, code);
_method->setAttributes(privateMethod, protectedMethod, guardedMethod);
// go add the method to the accumulator
addMethod(name, _method, classMethod);
}
/**
* Create an ATTRIBUTE "get" method.
*
* @param name The name of the attribute.
* @param retriever
* @param classMethod
* Indicates we're adding a class or instance method.
* @param privateMethod
* The method's private attribute.
* @param protectedMethod
* The method's protected attribute.
* @param guardedMethod
* The method's guarded attribute.
*/
void RexxSource::createAttributeGetterMethod(RexxString *name, RexxVariableBase *retriever,
bool classMethod, bool privateMethod, bool protectedMethod, bool guardedMethod)
{
// create the kernel method for the accessor
BaseCode *code = new AttributeGetterCode(retriever);
RexxMethod *_method = new RexxMethod(name, code);
_method->setAttributes(privateMethod, protectedMethod, guardedMethod);
// add this to the target
addMethod(name, _method, classMethod);
}
/**
* Create an ATTRIBUTE "set" method.
*
* @param name The name of the attribute.
* @param classMethod
* Indicates we're adding a class or instance method.
* @param privateMethod
* The method's private attribute.
* @param protectedMethod
* The method's protected attribute.
* @param guardedMethod
* The method's guarded attribute.
*/
void RexxSource::createAttributeSetterMethod(RexxString *name, RexxVariableBase *retriever,
bool classMethod, bool privateMethod, bool protectedMethod, bool guardedMethod)
{
// create the kernel method for the accessor
BaseCode *code = new AttributeSetterCode(retriever);
RexxMethod *_method = new RexxMethod(name, code);
_method->setAttributes(privateMethod, protectedMethod, guardedMethod);
// add this to the target
addMethod(name, _method, classMethod);
}
/**
* Create an abstract method.
*
* @param name The name of the method.
* @param classMethod
* Indicates we're adding a class or instance method.
* @param privateMethod
* The method's private attribute.
* @param protectedMethod
* The method's protected attribute.
* @param guardedMethod
* The method's guarded attribute.
*/
void RexxSource::createAbstractMethod(RexxString *name,
bool classMethod, bool privateMethod, bool protectedMethod, bool guardedMethod)
{
// create the kernel method for the accessor
// this uses a special code block
BaseCode *code = new AbstractCode();
RexxMethod * _method = new RexxMethod(name, code);
_method->setAttributes(privateMethod, protectedMethod, guardedMethod);
// add this to the target
addMethod(name, _method, classMethod);
}
/**
* Create a CONSTANT "get" method.
*
* @param target The target method directory.
* @param name The name of the attribute.
*/
void RexxSource::createConstantGetterMethod(RexxString *name, RexxObject *value)
{
ConstantGetterCode *code = new ConstantGetterCode(value);
// add this as an unguarded method
RexxMethod *method = new RexxMethod(name, code);
method->setUnguarded();
if (active_class == OREF_NULL)
{
addMethod(name, method, false);
}
else
{
active_class->addConstantMethod(name, method);
}
}
/**
* Process a ::routine directive in a source file.
*/
void RexxSource::routineDirective()
{
RexxToken *token = nextReal(); /* get the next token */
/* not a symbol or a string */
if (!token->isSymbolOrLiteral())
{
/* report an error */
syntaxError(Error_Symbol_or_string_routine, token);
}
RexxString *name = token->value; /* get the routine name */
/* does this already exist? */
if (this->routines->entry(name) != OREF_NULL)
{
/* have an error here */
syntaxError(Error_Translation_duplicate_routine);
}
this->flags |= _install; /* have information to install */
RexxString *externalname = OREF_NULL; /* no external name yet */
int Public = DEFAULT_ACCESS_SCOPE; /* not a public routine yet */
for (;;) /* now loop on the option keywords */
{
token = nextReal(); /* get the next token */
/* reached the end? */
if (token->isEndOfClause())
{
break; /* get out of here */
}
/* not a symbol token? */
else if (!token->isSymbol())
{
/* report an error */
syntaxError(Error_Invalid_subkeyword_routine, token);
}
/* process each sub keyword */
switch (this->subDirective(token))
{
/* ::ROUTINE name EXTERNAL []*/
case SUBDIRECTIVE_EXTERNAL:
/* already had an external? */
if (externalname != OREF_NULL)
{
/* duplicates are invalid */
syntaxError(Error_Invalid_subkeyword_class, token);
}
token = nextReal(); /* get the next token */
/* not a string? */
if (!token->isLiteral())
{
/* report an error */
syntaxError(Error_Symbol_or_string_requires, token);
}
/* external name is token value */
externalname = token->value;
break;
/* ::ROUTINE name PUBLIC */
case SUBDIRECTIVE_PUBLIC:
if (Public != DEFAULT_ACCESS_SCOPE) /* already had one of these? */
{
/* duplicates are invalid */
syntaxError(Error_Invalid_subkeyword_routine, token);
}
Public = PUBLIC_SCOPE; /* turn on the seen flag */
break;
/* ::ROUTINE name PUBLIC */
case SUBDIRECTIVE_PRIVATE:
if (Public != DEFAULT_ACCESS_SCOPE) /* already had one of these? */
{
/* duplicates are invalid */
syntaxError(Error_Invalid_subkeyword_routine, token);
}
Public = PRIVATE_SCOPE; /* turn on the seen flag */
break;
default: /* invalid keyword */
/* this is an error */
syntaxError(Error_Invalid_subkeyword_routine, token);
break;
}
}
{
this->saveObject(name); /* protect the name */
if (externalname != OREF_NULL) /* have an external routine? */
{
/* convert external into words */
RexxArray *_words = this->words(externalname);
// ::ROUTINE foo EXTERNAL "LIBRARY libbar [foo]"
if (((RexxString *)(_words->get(1)))->strCompare(CHAR_LIBRARY))
{
RexxString *library = OREF_NULL;
// the default entry point name is the internal name
RexxString *entry = name;
// full library with entry name version?
if (_words->size() == 3)
{
library = (RexxString *)_words->get(2);
entry = (RexxString *)_words->get(3);
}
else if (_words->size() == 2)
{
library = (RexxString *)_words->get(2);
}
else // wrong number of tokens
{
/* this is an error */
syntaxError(Error_Translation_bad_external, externalname);
}
/* go check the next clause to make */
this->checkDirective(Error_Translation_external_routine); /* sure no code follows */
/* create a new native method */
RoutineClass *routine = PackageManager::resolveRoutine(library, entry);
// raise an exception if this entry point is not found.
if (routine == OREF_NULL)
{
syntaxError(Error_External_name_not_found_routine, entry);
}
// make sure this is attached to the source object for context information
routine->setSourceObject(this);
/* add to the routine directory */
this->routines->setEntry(name, routine);
if (Public == PUBLIC_SCOPE) /* a public routine? */
{
/* add to the public directory too */
this->public_routines->setEntry(name, routine);
}
}
// ::ROUTINE foo EXTERNAL "REGISTERED libbar [foo]"
else if (((RexxString *)(_words->get(1)))->strCompare(CHAR_REGISTERED))
{
RexxString *library = OREF_NULL;
// the default entry point name is the internal name
RexxString *entry = name;
// full library with entry name version?
if (_words->size() == 3)
{
library = (RexxString *)_words->get(2);
entry = (RexxString *)_words->get(3);
}
else if (_words->size() == 2)
{
library = (RexxString *)_words->get(2);
}
else // wrong number of tokens
{
/* this is an error */
syntaxError(Error_Translation_bad_external, externalname);
}
/* go check the next clause to make */
this->checkDirective(Error_Translation_external_routine); /* sure no code follows */
/* create a new native method */
RoutineClass *routine = PackageManager::resolveRoutine(name, library, entry);
// raise an exception if this entry point is not found.
if (routine == OREF_NULL)
{
syntaxError(Error_External_name_not_found_routine, entry);
}
// make sure this is attached to the source object for context information
routine->setSourceObject(this);
/* add to the routine directory */
this->routines->setEntry(name, routine);
if (Public == PUBLIC_SCOPE) /* a public routine? */
{
/* add to the public directory too */
this->public_routines->setEntry(name, routine);
}
}
else
{
/* unknown external type */
syntaxError(Error_Translation_bad_external, externalname);
}
}
else
{
// NOTE: It is necessary to translate the block and protect the code
// before allocating the RexxMethod object. The new operator allocates the
// the object first, then evaluates the constructor arguments after the allocation.
// Since the translateBlock() call will allocate a lot of new objects before returning,
// there's a high probability that the method object can get garbage collected before
// there is any opportunity to protect the object.
RexxCode *code = this->translateBlock(OREF_NULL);
this->saveObject((RexxObject *)code);
RoutineClass *routine = new RoutineClass(name, code);
/* add to the routine directory */
this->routines->setEntry(name, routine);
if (Public == PUBLIC_SCOPE) /* a public routine? */
{
/* add to the public directory too */
this->public_routines->setEntry(name, routine);
}
}
this->toss(name); /* release the "Gary Cole" (GC) lock */
}
}
/**
* Process a ::REQUIRES directive.
*/
void RexxSource::requiresDirective()
{
RexxToken *token = nextReal(); /* get the next token */
/* not a symbol or a string */
if (!token->isSymbolOrLiteral())
{
/* report an error */
syntaxError(Error_Symbol_or_string_requires, token);
}
RexxString *name = token->value; /* get the requires name */
token = nextReal(); /* get the next token */
if (!token->isEndOfClause()) /* something appear after this? */
{
// this is potentially a library directive
libraryDirective(name, token);
return;
}
this->flags |= _install; /* have information to install */
/* save the ::requires location */
this->requires->append((RexxObject *)new RequiresDirective(name, this->clause));
}
/**
* Process a ::REQUIRES name LIBRARY directive.
*/
void RexxSource::libraryDirective(RexxString *name, RexxToken *token)
{
// we have an extra token on a ::REQUIRES directive. The only thing accepted here
// is the token LIBRARY.
if (!token->isSymbol())
{
syntaxError(Error_Invalid_subkeyword_requires, token);
}
/* process each sub keyword */
if (subDirective(token) != SUBDIRECTIVE_LIBRARY)
{
syntaxError(Error_Invalid_subkeyword_requires, token);
}
token = nextReal(); /* get the next token */
if (!token->isEndOfClause()) /* something appear after this? */
{
// nothing else allowed after this
syntaxError(Error_Invalid_subkeyword_requires, token);
}
this->flags |= _install; /* have information to install */
// add this to the library list
this->libraries->append((RexxObject *)new LibraryDirective(name, this->clause));
}
void RexxSource::directive()
/********************************************************************/
/* Function: parse a directive statement */
/********************************************************************/
{
RexxToken *token; /* current token under processing */
this->nextClause(); /* get the directive clause */
if (this->flags&no_clause) /* reached the end? */
return; /* all finished */
token = nextReal(); /* skip the leading :: */
if (token->classId != TOKEN_DCOLON) /* reached the end of a block? */
/* have an error here */
syntaxError(Error_Translation_bad_directive);
token = nextReal(); /* get the keyword token */
if (!token->isSymbol()) /* not a symbol? */
/* have an error here */
syntaxError(Error_Symbol_expected_directive);
switch (this->keyDirective(token))
{ /* match against the directive list */
case DIRECTIVE_CLASS: /* ::CLASS directive */
classDirective();
break;
case DIRECTIVE_METHOD: /* ::METHOD directive */
methodDirective();
break;
case DIRECTIVE_ROUTINE: /* ::ROUTINE directive */
routineDirective();
break;
case DIRECTIVE_REQUIRES: /* ::REQUIRES directive */
requiresDirective();
break;
case DIRECTIVE_ATTRIBUTE: /* ::ATTRIBUTE directive */
attributeDirective();
break;
case DIRECTIVE_CONSTANT: /* ::CONSTANT directive */
constantDirective();
break;
case DIRECTIVE_OPTIONS: /* ::OPTIONS directive */
optionsDirective();
break;
default: /* unknown directive */
syntaxError(Error_Translation_bad_directive);
break;
}
}
void RexxSource::flushControl(
RexxInstruction *_instruction) /* next instruction */
/******************************************************************************/
/* Function: Flush any pending compound instructions from the control stack */
/* for new added instructions */
/******************************************************************************/
{
size_t type; /* instruction type */
RexxInstruction *second; /* additional created instructions */
/* loop through the control stack */
for (;;)
{
type = this->topDo()->getType(); /* get the instruction type */
/* pending ELSE close? */
if (type == KEYWORD_ELSE)
{
second = this->popDo(); /* pop the item off of the control */
/* create a new end marker */
second = this->endIfNew((RexxInstructionIf *)second);
/* have an instruction? */
if (_instruction != OREF_NULL)
{
this->addClause(_instruction); /* add this here */
_instruction = OREF_NULL; /* don't process more instructions */
}
this->addClause(second); /* add the clause to the list */
}
/* nested IF-THEN situation? */
else if (type == KEYWORD_IFTHEN || type == KEYWORD_WHENTHEN)
{
second = this->popDo(); /* pop the item off of the control */
/* have an instruction? */
if (_instruction != OREF_NULL)
{
this->addClause(_instruction); /* add this here */
_instruction = OREF_NULL; /* don't process more instructions */
/* create a new end marker */
second = this->endIfNew((RexxInstructionIf *)second);
this->addClause(second); /* add the clause to the list */
this->pushDo(second); /* add to the control stack too */
}
else
{
/* create a new end marker */
second = this->endIfNew((RexxInstructionIf *)second);
this->addClause(second); /* add the clause to the list */
this->pushDo(second); /* add to the control stack too */
}
break; /* finish up here */
}
/* some other type of construct */
else
{
if (_instruction != OREF_NULL) /* have an instruction? */
{
this->addClause(_instruction); /* add this here */
}
break; /* finished flushing */
}
}
}
RexxCode *RexxSource::translateBlock(
RexxDirectory *_labels ) /* labels (for interpret) */
/******************************************************************************/
/* Function: Translate a block of REXX code (delimited by possible */
/* directive instructions */
/******************************************************************************/
{
RexxInstruction *_instruction; /* created instruction item */
RexxInstruction *second; /* secondary clause for IF/WHEN */
RexxToken *token; /* current working token */
size_t type; /* instruction type information */
size_t controltype; /* type on the control stack */
/* no instructions yet */
OrefSet(this, this->first, OREF_NULL);
OrefSet(this, this->last, OREF_NULL);
/* allocate the call list */
OrefSet(this, this->calls, new_list());
/* create variables and lit tables */
OrefSet(this, this->variables, (RexxDirectory *)TheCommonRetrievers->copy());
/* restart the variable index */
this->variableindex = FIRST_VARIABLE_INDEX;
OrefSet(this, this->exposed_variables, new_directory());
if (this->flags&_interpret) /* this an interpret? */
{
/* just use the existing label set */
OrefSet(this, this->labels, _labels);
}
else
{
/* create a new labels directory */
OrefSet(this, this->labels, new_directory());
}
/* not collecting guard variables yet*/
OrefSet(this, this->guard_variables, OREF_NULL);
this->maxstack = 0; /* clear all of the stack accounting */
this->currentstack = 0; /* fields */
this->flags &= ~no_clause; /* not reached the end yet */
/* add the first dummy instruction */
_instruction = new RexxInstruction(OREF_NULL, KEYWORD_FIRST);
this->pushDo(_instruction); /* set bottom of control stack */
this->addClause(_instruction); /* add to the instruction list */
this->nextClause(); /* get the next physical clause */
for (;;) /* process all clauses */
{
_instruction = OREF_NULL; /* zero the instruction pointer */
while (!(this->flags&no_clause)) /* scan through all labels */
{
/* resolve the instruction type */
_instruction = this->instruction();
if (_instruction == OREF_NULL) /* found a directive clause? */
{
break; /* return to higher level */
}
/* is this a label? */
if (_instruction->getType() != KEYWORD_LABEL)
{
break; /* have a non-label clause */
}
this->addClause(_instruction); /* add this to clause list */
this->nextClause(); /* get the next physical clause */
_instruction = OREF_NULL; /* no instruction any more */
}
/* get an end-of-clause? */
if (this->flags&no_clause || _instruction == OREF_NULL)
{
/* get the control stack type */
controltype = this->topDo()->getType();
/* while end of an IF or WHEN */
while (controltype == KEYWORD_ENDTHEN || controltype == KEYWORD_ENDWHEN)
{
this->popDo(); /* pop pending closing IFs */
this->flushControl(OREF_NULL); /* flush any IFs or ELSEs */
/* get the control stack type */
controltype = this->topDo()->getType();
}
/* any unclosed composite clauses? */
if (this->topDo()->getType() != KEYWORD_FIRST)
{
/* report the block error */
blockSyntaxError(this->topDo());
}
this->popDo(); /* remove the top one */
break; /* done parsing this section */
}
type = _instruction->getType(); /* get the top instruction type */
if (type != KEYWORD_ELSE) /* have a pending THEN to finish */
{
/* get the control stack type */
controltype = this->topDo()->getType();
/* while end of an IF or WHEN */
while (controltype == KEYWORD_ENDTHEN || controltype == KEYWORD_ENDWHEN)
{
this->popDo(); /* pop pending closing IFs */
this->flushControl(OREF_NULL); /* flush any IFs or ELSEs */
/* get the control stack type */
controltype = this->topDo()->getType();
}
}
if (type == KEYWORD_IF || type == KEYWORD_SELECT || type == KEYWORD_DO || type == KEYWORD_LOOP)
{
this->addClause(_instruction); /* add to instruction heap */
}
else if (type != KEYWORD_ELSE) /* not a new control level */
{
this->flushControl(_instruction); /* flush any IFs or ELSEs */
}
/* have a bad instruction within a */
/* SELECT instruction? */
if (this->topDo()->getType() == KEYWORD_SELECT &&
(type != KEYWORD_WHEN && type != KEYWORD_OTHERWISE && type != KEYWORD_END ))
{
syntaxError(Error_When_expected_whenotherwise, this->topDo());
}
switch (type) /* post process the instructions */
{
case KEYWORD_WHEN: /* WHEN clause of SELECT */
second = this->topDo(); /* get the top of the queue */
/* not working on a SELECT? */
if (second->getType() != KEYWORD_SELECT)
{
syntaxError(Error_Unexpected_when_when);
}
/* add this to the select list */
((RexxInstructionSelect *)second)->addWhen((RexxInstructionIf *)_instruction);
/* just fall into IF logic */
case KEYWORD_IF: /* start of an IF instruction */
token = nextReal(); /* get the terminator token */
/* have a terminator before the THEN?*/
if (token->isEndOfClause())
{
this->nextClause(); /* get the next physical clause */
if (this->flags&no_clause) /* get an end-of-file? */
{
/* raise an error */
syntaxError(Error_Then_expected_if, _instruction);
}
token = nextReal(); /* get the first token */
/* not a THEN keyword? */
if (!token->isSymbol() || this->keyword(token) != KEYWORD_THEN)
{
/* have an error */
syntaxError(Error_Then_expected_if, _instruction);
}
/* create a new then clause */
second = this->thenNew(token, (RexxInstructionIf *)_instruction);
token = nextReal(); /* get token after THEN keyword */
/* terminator here? */
if (token->isEndOfClause())
{
this->nextClause(); /* get the next physical clause */
if (this->flags&no_clause) /* get an end-of-file? */
{
/* raise an error */
syntaxError(Error_Incomplete_do_then, _instruction);
}
}
else
{
previousToken(); /* step back a token */
trimClause(); /* make this start of the clause */
}
}
else /* if expr THEN form */
{
/* create a new then clause */
second = this->thenNew(token, (RexxInstructionIf *)_instruction);
token = nextReal(); /* get token after THEN keyword */
/* terminator here? */
if (token->isEndOfClause())
{
this->nextClause(); /* get the next physical clause */
if (this->flags&no_clause) /* get an end-of-file? */
{
/* raise an error */
syntaxError(Error_Incomplete_do_then, _instruction);
}
}
else
{
previousToken(); /* step back a token */
trimClause(); /* make this start of the clause */
}
}
this->addClause(second); /* add this to the instruction list */
this->pushDo(second); /* add to top of control queue */
continue; /* straight around to process clause */
/* remainder */
case KEYWORD_ELSE: /* have an ELSE instruction */
second = this->topDo(); /* get the top block */
if (this->topDo()->getType() != KEYWORD_ENDTHEN)
{
/* have an error */
syntaxError(Error_Unexpected_then_else);
}
this->addClause(_instruction); /* add to instruction heap */
second = this->popDo(); /* pop the ENDTHEN item */
this->pushDo(_instruction); /* add to the control list */
/* join the THEN and ELSE together */
((RexxInstructionElse *)_instruction)->setParent((RexxInstructionEndIf *)second);
((RexxInstructionEndIf *)second)->setEndInstruction((RexxInstructionEndIf *)_instruction);
token = nextReal(); /* get the next token */
/* have an ELSE keyword alone? */
if (token->isEndOfClause())
{
this->nextClause(); /* get the next physical clause */
if (this->flags&no_clause) /* get an end-of-file? */
{
/* raise an error */
syntaxError(Error_Incomplete_do_else, _instruction);
}
}
else /* ELSE instruction form */
{
previousToken(); /* step back a token */
trimClause(); /* make this start of the clause */
}
continue; /* straight around to process clause */
/* remainder */
case KEYWORD_OTHERWISE: /* start of an OTHERWISE group */
second = this->topDo(); /* get the top of the queue */
/* not working on a SELECT? */
if (second->getType() != KEYWORD_SELECT)
{
syntaxError(Error_Unexpected_when_otherwise);
}
/* hook up the OTHERWISE instruction */
((RexxInstructionSelect *)second)->setOtherwise((RexxInstructionOtherwise *)_instruction);
this->pushDo(_instruction); /* add this to the control queue */
token = nextReal(); /* get the next token */
/* OTHERWISE instr form? */
if (!token->isEndOfClause())
{
previousToken(); /* step back a token */
trimClause(); /* make this start of the clause */
continue; /* straight around to process clause */
/* remainder */
}
break; /* normal OTHERWISE processing */
case KEYWORD_END: /* END instruction for DO or SELECT */
second = this->popDo(); /* get the top of the queue */
type = second->getType(); /* get the instruction type */
/* not working on a block? */
if (type != KEYWORD_SELECT && type != KEYWORD_OTHERWISE && type != KEYWORD_DO && type != KEYWORD_LOOP)
{
if (type == KEYWORD_ELSE) /* on an else? */
{
/* give the specific error */
syntaxError(Error_Unexpected_end_else);
}
else if (type == KEYWORD_IFTHEN || type == KEYWORD_WHENTHEN)
{
/* this is a different error */
syntaxError(Error_Unexpected_end_then);
}
else
{
/* have a misplaced END */
syntaxError(Error_Unexpected_end_nodo);
}
}
if (type == KEYWORD_OTHERWISE) /* OTHERWISE part of a SELECT? */
{
second = this->popDo(); /* need to pop one more item off */
}
/* matching a select? */
if (second->getType() == KEYWORD_SELECT)
{
/* match up the instruction */
((RexxInstructionSelect *)second)->matchEnd((RexxInstructionEnd *)_instruction, this);
}
else /* must be a DO block */
{
/* match up the instruction */
((RexxInstructionDo *)second)->matchEnd((RexxInstructionEnd *)_instruction, this);
}
this->flushControl(OREF_NULL); /* finish pending IFs or ELSEs */
break;
case KEYWORD_DO: // start of new DO group (also picks up LOOP instruction)
case KEYWORD_LOOP:
this->pushDo(_instruction); /* add this to the control queue */
break;
case KEYWORD_SELECT: /* start of new SELECT group */
this->pushDo(_instruction); /* and also to the control queue */
break;
default: /* other types of instruction */
break;
}
this->nextClause(); /* get the next physical clause */
}
/* now go resolve any label targets */
_instruction = (RexxInstruction *)(this->calls->removeFirst());
/* while still more references */
while (_instruction != (RexxInstruction *)TheNilObject)
{
/* actually a function call? */
if (isOfClass(FunctionCallTerm, _instruction))
{
/* resolve the function call */
((RexxExpressionFunction *)_instruction)->resolve(this->labels);
}
else
{
/* resolve the CALL/SIGNAL/FUNCTION */
/* label targets */
((RexxInstructionCallBase *)_instruction)->resolve(this->labels);
}
/* now get the next instruction */
_instruction = (RexxInstruction *)(this->calls->removeFirst());
}
/* remove the first instruction */
OrefSet(this, this->first, this->first->nextInstruction);
/* no labels needed? */
if (this->labels != OREF_NULL && this->labels->items() == 0)
{
/* release that directory also */
OrefSet(this, this->labels, OREF_NULL);
}
/* create a rexx code object */
return new RexxCode(this, this->first, this->labels, (this->maxstack+ 10), this->variableindex);
}
RexxInstruction *RexxSource::instruction()
/******************************************************************************/
/* Function: Process an individual REXX clause */
/******************************************************************************/
{
RexxToken *_first; /* first token of clause */
RexxToken *second; /* second token of clause */
RexxInstruction *_instruction; /* current working instruction */
RexxObject *term; /* term for a message send */
RexxObject *subexpression; /* subexpression of a clause */
int _keyword; /* resolved instruction keyword */
_instruction = OREF_NULL; /* default to no instruction found */
_first = nextReal(); /* get the first token */
if (_first->classId == TOKEN_DCOLON)
{/* reached the end of a block? */
firstToken(); /* reset the location */
this->reclaimClause(); /* give back the clause */
}
else
{ /* have a real instruction to process*/
second = nextToken(); /* now get the second token */
/* is this a label? (can be either */
/* a symbol or a literal) */
if ((_first->classId == TOKEN_SYMBOL || _first->classId == TOKEN_LITERAL) && second->classId == TOKEN_COLON)
{
if (this->flags&_interpret) /* is this an interpret? */
{
/* this is an error */
syntaxError(Error_Unexpected_label_interpret, _first);
}
firstToken(); /* reset to the beginning */
_instruction = this->labelNew(); /* create a label instruction */
second = nextToken(); /* get the next token */
/* not the end of the clause? */
if (!second->isEndOfClause())
{
previousToken(); /* give this token back */
trimClause(); /* make this start of the clause */
this->reclaimClause(); /* give the remaining clause back */
}
return _instruction;
}
// this is potentially an assignment of the form "symbol = expr"
if (_first->isSymbol())
{
// "symbol == expr" is considered an error
if (second->subclass == OPERATOR_STRICT_EQUAL)
{
syntaxError(Error_Invalid_expression_general, second);
}
// true assignment instruction?
if (second->subclass == OPERATOR_EQUAL)
{
return this->assignmentNew(_first);
}
// this could be a special assignment operator such as "symbol += expr"
else if (second->classId == TOKEN_ASSIGNMENT)
{
return this->assignmentOpNew(_first, second);
}
// other
}
/* some other type of instruction */
/* we need to skip over the first */
/* term of the instruction to */
/* determine the type of clause, */
/* including recognition of keyword */
/* instructions */
firstToken(); /* reset to the first token */
term = this->messageTerm(); /* get the first term of instruction */
second = nextToken(); /* get the next token */
// some sort of recognizable message term? Need to check for the
// special cases.
if (term != OREF_NULL)
{
// if parsing the message term consumed everything, this is a message instruction
if (second->isEndOfClause())
{
return this->messageNew((RexxExpressionMessage *)term);
}
else if (second->subclass == OPERATOR_STRICT_EQUAL)
{
// messageterm == something is an invalid assignment
syntaxError(Error_Invalid_expression_general, second);
}
// messageterm = something is a pseudo assignment
else if (second->subclass == OPERATOR_EQUAL)
{
this->saveObject(term); /* protect this */
// we need an expression following the op token
subexpression = this->subExpression(TERM_EOC);
if (subexpression == OREF_NULL)
{
syntaxError(Error_Invalid_expression_general, second);
}
// this is a message assignment
_instruction = this->messageAssignmentNew((RexxExpressionMessage *)term, subexpression);
this->toss(term); /* release the term */
return _instruction;
}
// one of the special operator forms?
else if (second->classId == TOKEN_ASSIGNMENT)
{
this->saveObject(term); /* protect this */
// we need an expression following the op token
subexpression = this->subExpression(TERM_EOC);
if (subexpression == OREF_NULL)
{
syntaxError(Error_Invalid_expression_general, second);
}
// this is a message assignment
_instruction = this->messageAssignmentOpNew((RexxExpressionMessage *)term, second, subexpression);
this->toss(term); /* release the term */
return _instruction;
}
}
// ok, none of the special cases passed....not start the keyword processing
firstToken(); /* reset to the first token */
_first = nextToken(); /* get the first token again */
/* is first a symbol that matches a */
/* defined REXX keyword? */
if (_first->isSymbol() && (_keyword = this->keyword(_first)))
{
switch (_keyword)
{ /* process each instruction type */
case KEYWORD_NOP: /* NOP instruction */
/* add the instruction to the parse */
_instruction = this->nopNew();
break;
case KEYWORD_DROP: /* DROP instruction */
/* add the instruction to the parse */
_instruction = this->dropNew();
break;
case KEYWORD_SIGNAL: /* various forms of SIGNAL */
/* add the instruction to the parse */
_instruction = this->signalNew();
break;
case KEYWORD_CALL: /* various forms of CALL */
/* add the instruction to the parse */
_instruction = this->callNew();
break;
case KEYWORD_RAISE: /* RAISE instruction */
/* add the instruction to the parse */
_instruction = this->raiseNew();
break;
case KEYWORD_ADDRESS: /* ADDRESS instruction */
/* add the instruction to the parse */
_instruction = this->addressNew();
break;
case KEYWORD_NUMERIC: /* NUMERIC instruction */
/* add the instruction to the parse */
_instruction = this->numericNew();
break;
case KEYWORD_TRACE: /* TRACE instruction */
/* add the instruction to the parse */
_instruction = this->traceNew();
break;
case KEYWORD_DO: /* all variations of DO instruction */
/* add the instruction to the parse */
_instruction = this->doNew();
break;
case KEYWORD_LOOP: /* all variations of LOOP instruction */
/* add the instruction to the parse */
_instruction = this->loopNew();
break;
case KEYWORD_EXIT: /* EXIT instruction */
/* add the instruction to the parse */
_instruction = this->exitNew();
break;
case KEYWORD_INTERPRET: /* INTERPRET instruction */
/* add the instruction to the parse */
_instruction = this->interpretNew();
break;
case KEYWORD_PUSH: /* PUSH instruction */
/* add the instruction to the parse */
_instruction = this->queueNew(QUEUE_LIFO);
break;
case KEYWORD_QUEUE: /* QUEUE instruction */
/* add the instruction to the parse */
_instruction = this->queueNew(QUEUE_FIFO);
break;
case KEYWORD_REPLY: /* REPLY instruction */
/* interpreted? */
if (this->flags&_interpret)
syntaxError(Error_Translation_reply_interpret);
/* add the instruction to the parse */
_instruction = this->replyNew();
break;
case KEYWORD_RETURN: /* RETURN instruction */
/* add the instruction to the parse */
_instruction = this->returnNew();
break;
case KEYWORD_IF: /* IF instruction */
/* add the instruction to the parse */
_instruction = this->ifNew(KEYWORD_IF);
break;
case KEYWORD_ITERATE: /* ITERATE instruction */
/* add the instruction to the parse */
_instruction = this->leaveNew(KEYWORD_ITERATE);
break;
case KEYWORD_LEAVE: /* LEAVE instruction */
/* add the instruction to the parse */
_instruction = this->leaveNew(KEYWORD_LEAVE);
break;
case KEYWORD_EXPOSE: /* EXPOSE instruction */
/* interpreted? */
if (this->flags&_interpret)
syntaxError(Error_Translation_expose_interpret);
/* add the instruction to the parse */
_instruction = this->exposeNew();
break;
case KEYWORD_FORWARD: /* FORWARD instruction */
/* interpreted? */
if (this->flags&_interpret)
syntaxError(Error_Translation_forward_interpret);
/* add the instruction to the parse */
_instruction = this->forwardNew();
break;
case KEYWORD_PROCEDURE: /* PROCEDURE instruction */
/* add the instruction to the parse */
_instruction = this->procedureNew();
break;
case KEYWORD_GUARD: /* GUARD instruction */
/* interpreted? */
if (this->flags&_interpret)
syntaxError(Error_Translation_guard_interpret);
/* add the instruction to the parse */
_instruction = this->guardNew();
break;
case KEYWORD_USE: /* USE instruction */
/* interpreted? */
if (this->flags&_interpret)
syntaxError(Error_Translation_use_interpret);
/* add the instruction to the parse */
_instruction = this->useNew();
break;
case KEYWORD_ARG: /* ARG instruction */
/* add the instruction to the parse */
_instruction = this->parseNew(SUBKEY_ARG);
break;
case KEYWORD_PULL: /* PULL instruction */
/* add the instruction to the parse */
_instruction = this->parseNew(SUBKEY_PULL);
break;
case KEYWORD_PARSE: /* PARSE instruction */
/* add the instruction to the parse */
_instruction = this->parseNew(KEYWORD_PARSE);
break;
case KEYWORD_SAY: /* SAY instruction */
/* add the instruction to the parse */
_instruction = this->sayNew();
break;
case KEYWORD_OPTIONS: /* OPTIONS instruction */
/* add the instruction to the parse */
_instruction = this->optionsNew();
break;
case KEYWORD_SELECT: /* SELECT instruction */
/* add the instruction to the parse */
_instruction = this->selectNew();
break;
case KEYWORD_WHEN: /* WHEN in an SELECT instruction */
/* add the instruction to the parse */
_instruction = this->ifNew(KEYWORD_WHEN);
break;
case KEYWORD_OTHERWISE: /* OTHERWISE in a SELECT */
/* add the instruction to the parse */
_instruction = this->otherwiseNew(_first);
break;
case KEYWORD_ELSE: /* unexpected ELSE */
/* add the instruction to the parse */
_instruction = this->elseNew(_first);
break;
case KEYWORD_END: /* END for a block construct */
/* add the instruction to the parse */
_instruction = this->endNew();
break;
case KEYWORD_THEN: /* unexpected THEN */
/* raise an error */
syntaxError(Error_Unexpected_then_then);
break;
}
}
else
{ /* this is a "command" instruction */
firstToken(); /* reset to the first token */
/* process this instruction */
_instruction = this->commandNew();
}
}
return _instruction; /* return the created instruction */
}
RexxVariableBase *RexxSource::addVariable(
RexxString *varname) /* variable to add */
/******************************************************************************/
/* Function: Resolve a variable name to a single common retriever object */
/* per method */
/******************************************************************************/
{
/* check the directory for an entry */
RexxVariableBase *retriever = (RexxVariableBase *)this->variables->fastAt(varname);
if (retriever == OREF_NULL) /* not in the table yet? */
{
if (!(this->flags&_interpret)) /* not in an interpret? */
{
this->variableindex++; /* step the counter */
/* create a new variable retriever */
retriever = new RexxParseVariable(varname, this->variableindex);
}
else /* force dynamic lookup each time */
{
retriever = new RexxParseVariable(varname, 0);
}
/* add to the variable table */
this->variables->put((RexxObject *)retriever, varname);
}
/* collecting guard variables? */
if (this->guard_variables != OREF_NULL)
{
/* in the list of exposed variables? */
if (this->exposed_variables != OREF_NULL && this->exposed_variables->fastAt(varname) != OREF_NULL)
{
/* add this to the guard list */
this->guard_variables->put((RexxObject *)retriever, (RexxObject *)retriever);
}
}
return retriever; /* return variable accesser */
}
RexxStemVariable *RexxSource::addStem(
RexxString *stemName) /* stem to add */
/******************************************************************************/
/* Function: Process creation of stem variables */
/******************************************************************************/
{
/* check the table for an entry */
RexxStemVariable *retriever = (RexxStemVariable *)(this->variables->fastAt(stemName));
if (retriever == OREF_NULL) /* not in the table yet? */
{
if (!(this->flags&_interpret)) /* not in an interpret? */
{
this->variableindex++; /* step the counter */
/* create a new variable retriever */
retriever = new RexxStemVariable(stemName, this->variableindex);
}
else /* force dynamic lookup each time */
{
retriever = new RexxStemVariable(stemName, 0);
}
/* add to the variable table */
this->variables->put((RexxObject *)retriever, stemName);
}
/* collecting guard variables? */
if (this->guard_variables != OREF_NULL)
{
/* in the list of exposed variables? */
if (this->exposed_variables != OREF_NULL && this->exposed_variables->fastAt(stemName) != OREF_NULL)
{
/* add this to the guard list */
this->guard_variables->put((RexxObject *)retriever, (RexxObject *)retriever);
}
}
return retriever; /* return variable accesser */
}
RexxCompoundVariable *RexxSource::addCompound(
RexxString *name) /* name of the compound variable */
/******************************************************************************/
/* Function: Parse to completion a compound variable */
/******************************************************************************/
{
RexxStemVariable *stemRetriever; /* retriever for the stem value */
RexxString *stemName; /* stem part of compound variable */
RexxString *tail; /* tail section string value */
const char * start; /* starting scan position */
size_t length; /* length of tail section */
const char * _position; /* current position */
const char * end; // the end scanning position
size_t tailCount; /* count of tails in compound */
length = name->getLength(); /* get the string length */
_position = name->getStringData(); /* start scanning at first character */
start = _position; /* save the starting point */
end = _position + length; // save our end marker
// we know this is a compound, so there must be at least one period.
/* scan to the first period */
while (*_position != '.')
{
_position++; /* step to the next character */
}
/* get the stem string */
stemName = new_string(start, _position - start + 1);
stemRetriever = this->addStem(stemName); /* get a retriever item for this */
tailCount = 0; /* no tails yet */
do /* process rest of the variable */
{
// we're here because we just saw a previous period. that's either the
// stem variable period or the last tail element we processed.
// either way, we step past it. If this period is a trailing one,
// we'll add a null tail element, which is exactly what we want.
_position++; /* step past previous period */
start = _position; /* save the start position */
/* scan for the next period */
while (_position < end)
{
if (*_position == '.') // found the next one?
{
break; // stop scanning now
}
_position++; // continue looking
}
/* extract the tail piece */
tail = new_string(start, _position - start);
/* have a null tail piece or */
/* section begin with a digit? */
if (!(tail->getLength() == 0 || (*start >= '0' && *start <= '9')))
{
/* push onto the term stack */
this->subTerms->push((RexxObject *)(this->addVariable(tail)));
}
else
{
/* just use the string value directly*/
this->subTerms->push(this->commonString(tail));
}
tailCount++; /* up the tail count */
} while (_position < end);
/* finally, create the compound var */
return new (tailCount) RexxCompoundVariable(stemName, stemRetriever->index, this->subTerms, tailCount);
}
void RexxSource::expose(
RexxString *name ) /* variable name to add to list */
/******************************************************************************/
/* Function: Add a variable name to the list of exposed variables for the */
/* method. */
/******************************************************************************/
{
/* add to the exposed variables list */
this->exposed_variables->put(name, name);
}
RexxString *RexxSource::commonString(
RexxString *string ) /* string token to "collapse" */
/******************************************************************************/
/* Function: Compress all string tokens needed by a group of programs into */
/* a single, common set of strings. */
/******************************************************************************/
{
/* check the global table first */
RexxString *result = (RexxString *)this->strings->fastAt(string);
/* not in the table */
if (result == OREF_NULL)
{
this->strings->put(string, string);/* add this to the table */
result = string; /* also the final value */
}
return result; /* return the string */
}
RexxObject *RexxSource::addVariable(RexxToken *token)
{
needVariable(token);
return addText(token);
}
RexxObject *RexxSource::addText(
RexxToken *token) /* token to process */
/******************************************************************************/
/* Function: Generalized text token addition */
/******************************************************************************/
{
RexxObject *retriever; /* created retriever */
RexxObject *value; /* evaluated literal value */
RexxString *name = token->value; /* get the string value for this */
switch (token->classId)
{
case TOKEN_SYMBOL: /* various types of symbols */
/* each symbol subtype requires a */
/* different retrieval method */
switch (token->subclass)
{
case SYMBOL_DUMMY: /* just a dot symbol */
case SYMBOL_CONSTANT: /* a literal symbol */
/* see if we've had this before */
retriever = this->literals->fastAt(name);
/* first time literal? */
if (retriever == OREF_NULL)
{
/* can we create an integer object? */
if (token->numeric == INTEGER_CONSTANT)
{
/* create this as an integer */
value = name->requestInteger(Numerics::DEFAULT_DIGITS);
/* conversion error? */
if (value == TheNilObject)
{
value = name; /* just go with the string value */
}
else
/* snip off the string number string */
/* value that was created when the */
/* integer value was created. This */
/* is rarely used, but contributes */
/* to the saved program size */
name->setNumberString(OREF_NULL);
}
else
{
value = name; /* just use the string value */
/* give it a number string value */
name->setNumberString((RexxObject *)value->numberString());
}
/* the constant is the retriever */
this->literals->put(value, name);
retriever = value; /* the retriever is the value itthis */
}
break;
case SYMBOL_VARIABLE: /* simple variable symbol */
/* add variable to proper dictionary */
retriever = (RexxObject *)this->addVariable(name);
break;
case SYMBOL_STEM: /* stem variable */
/* add variable to proper dictionary */
retriever = (RexxObject *)this->addStem(name);
break;
case SYMBOL_COMPOUND: /* compound variable, need more */
/* add variable to proper dictionary */
retriever = (RexxObject *)this->addCompound(name);
break;
case SYMBOL_DOTSYMBOL: /* variable with a leading dot */
/* get a lookup object */
/* see if we've had this before */
retriever = this->variables->fastAt(name);
/* first time dot variable? */
if (retriever == OREF_NULL)
{
/* create the shorter name */
value = name->extract(1, name->getLength() - 1);
/* add this to the common pile */
value = this->commonString((RexxString *)value);
/* create a retriever for this */
retriever = (RexxObject *)new RexxDotVariable((RexxString *)value);
/* add this to the common table */
this->variables->put(retriever, name);
}
break;
default: /* all other types (shouldn't happen)*/
retriever = OREF_NULL; /* return nothing */
break;
}
break;
case TOKEN_LITERAL: /* literal strings */
/* get a lookup object */
/* see if we've had this before */
retriever = this->literals->fastAt(name);
/* first time literal? */
if (retriever == OREF_NULL)
{
/* the constant is the retriever */
this->literals->put(name, name);
retriever = name; /* use the name directly */
}
break;
default: /* all other tokens */
retriever = OREF_NULL; /* don't return anything */
break;
}
return retriever; /* return created retriever */
}
RexxVariableBase *RexxSource::getRetriever(
RexxString *name) /* name of the variable to process */
/******************************************************************************/
/* Function: Generalized method attribute retriever */
/******************************************************************************/
{
RexxVariableBase *retriever = OREF_NULL; /* created retriever */
/* go validate the symbol */
switch (name->isSymbol())
{
case STRING_NAME: /* valid simple name */
/* get a simple dynamic retriever */
retriever = (RexxVariableBase *)new RexxParseVariable(name, 0);
break;
case STRING_STEM: /* this is a stem name */
/* force dynamic lookup each time */
retriever = (RexxVariableBase *)new RexxStemVariable(name, 0);
break;
case STRING_COMPOUND_NAME: /* compound variable name */
/* get a direct retriever for this */
retriever = (RexxVariableBase *)RexxVariableDictionary::buildCompoundVariable(name, true);
break;
default: /* all other invalid cases */
/* have an invalid attribute */
syntaxError(Error_Translation_invalid_attribute, name);
}
return retriever; /* return created retriever */
}
void RexxSource::addClause(
RexxInstruction *_instruction) /* new label to add */
/******************************************************************************/
/* Add an instruction to the tree code execution stream */
/******************************************************************************/
{
/* is this the first one? */
if (this->first == OREF_NULL)
{
/* make this the first one */
OrefSet(this, this->first, _instruction);
/* and the last one */
OrefSet(this, this->last, _instruction);
}
/* non-root instruction */
else
{
this->last->setNext(_instruction); /* add on to the last instruction */
/* this is the new last instruction */
OrefSet(this, this->last, _instruction);
}
/* now safe from garbage collection */
this->toss((RexxObject *)_instruction);
}
void RexxSource::addLabel(
RexxInstruction *label, /* new label to add */
RexxString *labelname ) /* the label name */
/******************************************************************************/
/* Function: add a label to the global label table. */
/******************************************************************************/
{
/* not already in the table? */
if (this->labels->fastAt(labelname) == OREF_NULL)
{
/* add this item */
this->labels->put((RexxObject *)label, labelname);
}
}
RexxInstruction *RexxSource::findLabel(
RexxString *labelname) /* target label */
/******************************************************************************/
/* Search the label table for a label name match */
/******************************************************************************/
{
if (this->labels != OREF_NULL) /* have labels? */
{
/* just return entry from the table */
return(RexxInstruction *)this->labels->fastAt(labelname);
}
else
{
return OREF_NULL; /* don't return anything */
}
}
void RexxSource::setGuard()
/******************************************************************************/
/* Function: Set on guard expression variable "gathering" */
/******************************************************************************/
{
/* just starting to trap? */
if (this->guard_variables == OREF_NULL)
{
/* create the guard table */
OrefSet(this, this->guard_variables, new_identity_table());
}
}
RexxArray *RexxSource::getGuard()
/******************************************************************************/
/* Function: Complete guard expression variable collection and return the */
/* table of variables. */
/******************************************************************************/
{
/* convert into an array */
RexxArray *guards = this->guard_variables->makeArray();
/* discard the table */
OrefSet(this, this->guard_variables, OREF_NULL);
/* just starting to trap? */
return guards; /* return the guards array */
}
RexxObject *RexxSource::constantExpression()
/******************************************************************************/
/* Function: Evaluate a "constant" expression for REXX instruction keyword */
/* values. A constant expression is a literal string, constant */
/* symbol, or an expression enclosed in parentheses. */
/******************************************************************************/
{
RexxToken *token; /* current token */
RexxToken *second; /* second token */
RexxObject *_expression = OREF_NULL; /* parse expression */
token = nextReal(); /* get the first token */
if (token->isLiteral()) /* literal string expression? */
{
_expression = this->addText(token); /* get the literal retriever */
}
else if (token->isConstant()) /* how about a constant symbol? */
{
_expression = this->addText(token); /* get the literal retriever */
}
/* got an end of expression? */
else if (token->isEndOfClause())
{
previousToken(); /* push the token back */
return OREF_NULL; /* nothing here (may be optional) */
}
/* not a left paren here? */
else if (token->classId != TOKEN_LEFT)
{
/* this is an invalid expression */
syntaxError(Error_Invalid_expression_general, token);
}
else
{
/* get the subexpression */
_expression = this->subExpression(TERM_EOC | TERM_RIGHT);
second = nextToken(); /* get the terminator token */
/* not terminated by a right paren? */
if (second->classId != TOKEN_RIGHT)
{
/* this is an error */
syntaxErrorAt(Error_Unmatched_parenthesis_paren, token);
}
}
this->holdObject(_expression); /* protect the expression */
return _expression; /* and return it */
}
RexxObject *RexxSource::constantLogicalExpression()
/******************************************************************************/
/* Function: Evaluate a "constant" expression for REXX instruction keyword */
/* values. A constant expression is a literal string, constant */
/* symbol, or an expression enclosed in parentheses. The */
/* expression inside parens can be a complex logical expression. */
/******************************************************************************/
{
RexxToken *token; /* current token */
RexxToken *second; /* second token */
RexxObject *_expression = OREF_NULL; /* parse expression */
token = nextReal(); /* get the first token */
if (token->isLiteral()) /* literal string expression? */
{
_expression = this->addText(token); /* get the literal retriever */
}
else if (token->isConstant()) /* how about a constant symbol? */
{
_expression = this->addText(token); /* get the literal retriever */
}
/* got an end of expression? */
else if (token->isEndOfClause())
{
previousToken(); /* push the token back */
return OREF_NULL; /* nothing here (may be optional) */
}
/* not a left paren here? */
else if (token->classId != TOKEN_LEFT)
{
/* this is an invalid expression */
syntaxError(Error_Invalid_expression_general, token);
}
else
{
/* get the subexpression */
_expression = this->parseLogical(token, TERM_EOC | TERM_RIGHT);
second = nextToken(); /* get the terminator token */
/* not terminated by a right paren? */
if (second->classId != TOKEN_RIGHT)
{
/* this is an error */
syntaxErrorAt(Error_Unmatched_parenthesis_paren, token);
}
}
this->holdObject(_expression); /* protect the expression */
return _expression; /* and return it */
}
RexxObject *RexxSource::parenExpression(RexxToken *start)
/******************************************************************************/
/* Function: Evaluate a "parenthetical" expression for REXX instruction */
/* values. A parenthetical expression is an expression enclosed */
/* in parentheses. */
/******************************************************************************/
{
// NB, the opening paren has already been parsed off
RexxObject *_expression = this->subExpression(TERM_EOC | TERM_RIGHT);
RexxToken *second = nextToken(); /* get the terminator token */
/* not terminated by a right paren? */
if (second->classId != TOKEN_RIGHT)
{
syntaxErrorAt(Error_Unmatched_parenthesis_paren, start);
}
/* this is an error */
this->holdObject(_expression); /* protect the expression */
return _expression; /* and return it */
}
RexxObject *RexxSource::expression(
int terminators ) /* expression termination context */
/******************************************************************************/
/* Function: Parse off an expression, stopping when one of the possible set */
/* of terminator tokens is reached. The terminator token is */
/* placed back on the token queue. */
/******************************************************************************/
{
nextReal(); /* get the first real token */
previousToken(); /* now put it back */
/* parse off the subexpression */
return this->subExpression(terminators);
}
RexxObject *RexxSource::subExpression(
int terminators ) /* expression termination context */
/******************************************************************************/
/* Function: Parse off a sub- expression, stopping when one of the possible */
/* set of terminator tokens is reached. The terminator token is */
/* placed back on the token queue. */
/******************************************************************************/
{
RexxObject *left; /* left term of operation */
RexxObject *right; /* right term of operation */
RexxToken *token; /* current working token */
RexxToken *second; /* look ahead token */
RexxObject *subexpression; /* final subexpression */
SourceLocation location; /* token location info */
/* get the left term */
left = this->messageSubterm(terminators);
if (left == OREF_NULL) /* end of the expression? */
{
return OREF_NULL; /* done processing here */
}
this->pushTerm(left); /* add the term to the term stack */
/* add a fence item to operator stack*/
this->pushOperator((RexxToken *)TheNilObject);
token = nextToken(); /* get the next token */
/* loop until end of expression */
while (!this->terminator(terminators, token))
{
switch (token->classId)
{
case TOKEN_TILDE: /* have a message send operation */
case TOKEN_DTILDE: /* have a double twiddle operation */
left = this->popTerm(); /* get the left term from the stack */
if (left == OREF_NULL) /* not there? */
{
/* this is an invalid expression */
syntaxError(Error_Invalid_expression_general, token);
}
/* process a message term */
subexpression = this->message(left, token->classId == TOKEN_DTILDE, terminators);
this->pushTerm(subexpression); /* push this back on the term stack */
break;
case TOKEN_SQLEFT: /* collection syntax message */
left = this->popTerm(); /* get the left term from the stack */
if (left == OREF_NULL) /* not there? */
{
/* this is an invalid expression */
syntaxError(Error_Invalid_expression_general, token);
}
/* process a message term */
subexpression = this->collectionMessage(token, left, terminators);
this->pushTerm(subexpression); /* push this back on the term stack */
break;
case TOKEN_SYMBOL: /* Symbol in the expression */
case TOKEN_LITERAL: /* Literal in the expression */
case TOKEN_LEFT: /* start of subexpression */
location = token->getLocation(); /* get the token start position */
/* abuttal ends on the same line */
location.setEnd(location.getLineNumber(), location.getOffset());
/* This is actually an abuttal */
token = new RexxToken (TOKEN_OPERATOR, OPERATOR_ABUTTAL, OREF_NULLSTRING, location);
previousToken(); /* step back on the token list */
case TOKEN_BLANK: /* possible blank concatenate */
second = nextReal(); /* get the next token */
/* blank prior to a terminator? */
if (this->terminator(terminators, second))
{
break; /* not a real operator */
}
else /* have a blank operator */
{
previousToken(); /* push this back */
}
/* fall through to operator logic */
case TOKEN_OPERATOR: /* have a dyadic operator */
/* actually a prefix only one? */
if (token->subclass == OPERATOR_BACKSLASH)
{
/* this is an invalid expression */
syntaxError(Error_Invalid_expression_general, token);
}
/* handle operator precedence */
for (;;)
{
second = this->topOperator();/* get the top term */
/* hit the fence term? */
if (second == (RexxToken *)TheNilObject)
{
break; /* out of here */
}
/* current have higher precedence? */
if (this->precedence(token) > this->precedence(second))
{
break; /* finished also */
}
right = this->popTerm(); /* get the right term */
left = this->popTerm(); /* and the left term */
/* not enough terms? */
if (right == OREF_NULL || left == OREF_NULL)
{
/* this is an invalid expression */
syntaxError(Error_Invalid_expression_general, token);
}
/* create a new operation */
RexxToken *op = popOperator();
subexpression = (RexxObject *)new RexxBinaryOperator(op->subclass, left, right);
/* push this back on the term stack */
this->pushTerm(subexpression);
}
this->pushOperator(token); /* push this operator onto stack */
right = this->messageSubterm(terminators);
/* end of the expression? */
if (right == OREF_NULL && token->subclass != OPERATOR_BLANK)
{
/* have a bad expression */
syntaxError(Error_Invalid_expression_general, token);
}
this->pushTerm(right); /* add the term to the term stack */
break;
case TOKEN_ASSIGNMENT:
// special assignment token in a bad context. We report this as an error.
/* this is an invalid expression */
syntaxError(Error_Invalid_expression_general, token);
break;
case TOKEN_COMMA: /* found a comma in the expression */
/* should have been trapped as an */
/* expression terminator, so this is */
/* not a valid expression */
syntaxError(Error_Unexpected_comma_comma);
break;
case TOKEN_RIGHT: /* found a paren in the expression */
syntaxError(Error_Unexpected_comma_paren);
break;
case TOKEN_SQRIGHT: /* found a bracket in the expression */
syntaxError(Error_Unexpected_comma_bracket);
break;
default: /* something unexpected */
/* not a valid expression */
syntaxError(Error_Invalid_expression_general, token);
break;
}
token = nextToken(); /* get the next token */
}
token= this->popOperator(); /* get top operator token */
/* process pending operations */
while (token != (RexxToken *)TheNilObject)
{
right = this->popTerm(); /* get the right term */
left = this->popTerm(); /* now get the left term */
/* missing any terms? */
if (left == OREF_NULL || right == OREF_NULL)
{
/* this is an invalid expression */
syntaxError(Error_Invalid_expression_general, token);
}
/* create a new operation */
subexpression = (RexxObject *)new RexxBinaryOperator(token->subclass, left, right);
this->pushTerm(subexpression); /* push this back on the term stack */
token = this->popOperator(); /* get top operator token */
}
return this->popTerm(); /* expression is top of term stack */
}
RexxArray *RexxSource::argArray(
RexxToken *_first, /* token starting arglist */
int terminators ) /* expression termination context */
/******************************************************************************/
/* Function: Parse off an array of argument expressions */
/******************************************************************************/
{
size_t argCount; /* count of arguments */
RexxArray *_argArray; /* returned array */
/* scan off the argument list */
argCount = this->argList(_first, terminators);
_argArray = new_array(argCount); /* get a new argument list */
/* now copy the argument pointers */
while (argCount > 0)
{
/* in reverse order */
_argArray->put(this->subTerms->pop(), argCount--);
}
return _argArray; /* return the argument array */
}
size_t RexxSource::argList(
RexxToken *_first, /* token starting arglist */
int terminators ) /* expression termination context */
/******************************************************************************/
/* Function: Parse off a list of argument expressions */
/******************************************************************************/
{
RexxQueue *arglist; /* argument list */
RexxObject *subexpr; /* current subexpression */
RexxToken *token; /* current working token */
size_t realcount; /* count of real arguments */
size_t total; /* total arguments */
arglist = this->subTerms; /* use the subterms list */
realcount = 0; /* no arguments yet */
total = 0;
/* get the first real token, which */
nextReal(); /* skips any leading blanks on CALL */
previousToken(); /* now put it back */
/* loop until get a full terminator */
for (;;)
{
/* parse off next argument expression*/
subexpr = this->subExpression(terminators | TERM_COMMA);
arglist->push(subexpr); /* add next argument to list */
this->pushTerm(subexpr); /* add the term to the term stack */
total++; /* increment the total */
if (subexpr != OREF_NULL) /* real expression? */
{
realcount = total; /* update the real count */
}
token = nextToken(); /* get the next token */
if (token->classId != TOKEN_COMMA) /* start of next argument? */
{
break; /* no, all finished */
}
}
/* not closed with expected ')'? */
if (terminators & TERM_RIGHT && token->classId != TOKEN_RIGHT)
{
/* raise an error */
syntaxErrorAt(Error_Unmatched_parenthesis_paren, _first);
}
/* not closed with expected ']'? */
if (terminators&TERM_SQRIGHT && token->classId != TOKEN_SQRIGHT)
{
/* have an unmatched bracket */
syntaxErrorAt(Error_Unmatched_parenthesis_square, _first);
}
this->popNTerms(total); /* pop all items off the term stack */
/* pop off any trailing omitteds */
while (total > realcount)
{
arglist->pop(); /* just pop off the dummy */
total--; /* reduce the total */
}
return realcount; /* return the argument count */
}
RexxObject *RexxSource::function(
RexxToken *token, /* arglist start (for error reports) */
RexxToken *name, /* function name */
int terminators ) /* expression termination context */
/******************************************************************************/
/* Function: Parse off a REXX function call */
/******************************************************************************/
{
size_t argCount; /* count of function arguments */
RexxExpressionFunction *_function; /* newly created function argument */
saveObject((RexxObject *)name); // protect while parsing the argument list
/* process the argument list */
argCount = this->argList(token, ((terminators | TERM_RIGHT) & ~TERM_SQRIGHT));
/* create a new function item */
_function = new (argCount) RexxExpressionFunction(name->value, argCount, this->subTerms, this->resolveBuiltin(name->value), name->isLiteral());
/* add to table of references */
this->addReference((RexxObject *)_function);
removeObj((RexxObject *)name); // end of protected windoww.
return (RexxObject *)_function; /* and return this to the caller */
}
RexxObject *RexxSource::collectionMessage(
RexxToken *token, /* arglist start (for error reports) */
RexxObject *target, /* target term */
int terminators ) /* expression termination context */
/******************************************************************************/
/* Function: Process an expression term of the form "target[arg,arg]" */
/******************************************************************************/
{
size_t argCount; /* count of function arguments */
RexxObject *_message; /* new message term */
this->saveObject((RexxObject *)target); /* save target until it gets connected to message */
/* process the argument list */
argCount = this->argList(token, ((terminators | TERM_SQRIGHT) & ~TERM_RIGHT));
/* create a new function item */
_message = (RexxObject *)new (argCount) RexxExpressionMessage(target, (RexxString *)OREF_BRACKETS, (RexxObject *)OREF_NULL, argCount, this->subTerms, false);
this->holdObject(_message); /* hold this here for a while */
this->removeObj((RexxObject *)target); /* target is now connected to message, remove from savelist without hold */
return _message; /* return the message item */
}
RexxToken *RexxSource::getToken(
int terminators, /* expression termination context */
int errorcode) /* expected error code */
/******************************************************************************/
/* Function: Get a token, checking to see if this is a terminatore token */
/******************************************************************************/
{
RexxToken *token = nextToken(); /* get the next token */
/* this a terminator token? */
if (this->terminator(terminators, token))
{
if (errorcode != 0) /* want an error raised? */
{
syntaxError(errorcode); /* report this */
}
return OREF_NULL; /* just return a null */
}
return token; /* return the token */
}
RexxObject *RexxSource::message(
RexxObject *target, /* message send target */
bool doubleTilde, /* class of message send */
int terminators ) /* expression termination context */
/******************************************************************************/
/* Function: Parse a full message send expression term */
/******************************************************************************/
{
size_t argCount; /* list of function arguments */
RexxString *messagename = OREF_NULL; /* message name */
RexxObject *super; /* super class target */
RexxToken *token; /* current working token */
RexxExpressionMessage *_message; /* new message term */
super = OREF_NULL; /* default no super class */
argCount = 0; /* and no arguments */
this->saveObject(target); /* save target until it gets connected to message */
/* add the term to the term stack so that the calculations */
/* include this in the processing. */
this->pushTerm(target);
/* get the next token */
token = this->getToken(terminators, Error_Symbol_or_string_tilde);
/* unexpected type? */
if (token->isSymbolOrLiteral())
{
messagename = token->value; /* get the message name */
}
else
{
/* error! */
syntaxError(Error_Symbol_or_string_tilde);
}
/* get the next token */
token = this->getToken(terminators, 0);
if (token != OREF_NULL)
{ /* not reached the clause end? */
/* have a super class? */
if (token->classId == TOKEN_COLON)
{
/* get the next token */
token = this->getToken(terminators, Error_Symbol_expected_colon);
/* not a variable symbol? */
if (!token->isVariable() && token->subclass != SYMBOL_DOTSYMBOL)
{
/* have an error */
syntaxError(Error_Symbol_expected_colon);
}
super = this->addText(token); /* get the variable retriever */
/* get the next token */
token = this->getToken(terminators, 0);
}
}
if (token != OREF_NULL)
{ /* not reached the clause end? */
if (token->classId == TOKEN_LEFT) /* have an argument list? */
{
/* process the argument list */
argCount = this->argList(token, ((terminators | TERM_RIGHT) & ~TERM_SQRIGHT));
}
else
{
previousToken(); /* something else, step back */
}
}
this->popTerm(); /* it is now safe to pop the message target */
/* create a message send node */
_message = new (argCount) RexxExpressionMessage(target, messagename, super, argCount, this->subTerms, doubleTilde);
/* protect for a bit */
this->holdObject((RexxObject *)_message);
this->removeObj(target); /* target is now connected to message, remove from savelist without hold */
return(RexxObject *)_message; /* return the message item */
}
/**
* Parse off a single variable symbol or a message term that
* can be used for an assignment.
*
* NOTE: If this is a message term, then the message term
* will be configured as an assignment term.
*
* @return The object for an assignment target, or OREF_NULL if something
* other than a variable or a message term was found. On return,
* the clause position pointer will either be unchanged or
* positioned at the next token of the clause.
*/
RexxObject *RexxSource::variableOrMessageTerm()
{
// try for a message term first. If not successful, see if the
// next token is a variable symbol.
RexxObject *result = messageTerm();
if (result == OREF_NULL)
{
RexxToken *_first = nextReal();
if (_first->isSymbol())
{
// ok, add the variable to the processing list
this->needVariable(_first);
result = this->addText(_first);
}
else
{
previousToken(); // just push back on for the caller to sort out
}
}
else
{
// we need to convert this into an assignment message.
((RexxExpressionMessage *)result)->makeAssignment(this);
}
return result;
}
RexxObject *RexxSource::messageTerm()
/******************************************************************************/
/* Function: Parse off an instruction leading message term element */
/******************************************************************************/
{
RexxToken *token; /* current working token */
RexxObject *term; /* working term */
RexxObject *start; /* starting term */
int classId; /* token class */
size_t mark = markPosition(); // save the current position so we can reset cleanly
start = this->subTerm(TERM_EOC); /* get the first term of instruction */
this->holdObject(start); /* save the starting term */
term = OREF_NULL; /* default to no term */
token = nextToken(); /* get the next token */
classId = token->classId; /* get the token class */
/* while cascading message sends */
while (classId == TOKEN_TILDE || classId == TOKEN_DTILDE || classId == TOKEN_SQLEFT )
{
if (classId == TOKEN_SQLEFT) /* left bracket form? */
{
term = this->collectionMessage(token, start, TERM_EOC);
}
else
{
/* process a message term */
term = this->message(start, classId == TOKEN_DTILDE, TERM_EOC);
}
start = term; /* set for the next pass */
token = nextToken(); /* get the next token */
classId = token->classId; /* get the token class */
}
previousToken(); /* push this term back */
// if this was not a valid message term, reset the position to the beginning
if (term == OREF_NULL)
{
resetPosition(mark); // reset back to the entry conditions
}
/* return the message term (returns */
return term; /* OREF_NULL if not a message term) */
}
RexxObject *RexxSource::messageSubterm(
int terminators ) /* expression termination context */
/******************************************************************************/
/* Function: Parse off a message subterm within an expression */
/******************************************************************************/
{
RexxToken *token; /* current working token */
RexxObject *term = OREF_NULL; /* working term */
int classId; /* token class */
token = nextToken(); /* get the next token */
/* this the expression end? */
if (this->terminator(terminators, token))
{
return OREF_NULL; /* nothing to do here */
}
/* have potential prefix operator? */
if (token->classId == TOKEN_OPERATOR)
{
/* handle prefix operators as terms */
switch (token->subclass)
{
case OPERATOR_PLUS: /* prefix plus */
case OPERATOR_SUBTRACT: /* prefix minus */
case OPERATOR_BACKSLASH: /* prefix backslash */
/* handle following term */
term = this->messageSubterm(terminators);
if (term == OREF_NULL) /* nothing found? */
{
/* this is an error */
syntaxError(Error_Invalid_expression_prefix, token);
}
/* create the new operator term */
term = (RexxObject *)new RexxUnaryOperator(token->subclass, term);
break;
default: /* other operators not allowed here */
/* this is an error */
syntaxError(Error_Invalid_expression_general, token);
}
}
/* non-prefix operator code */
else
{
previousToken(); /* put back the first token */
term = this->subTerm(TERM_EOC); /* get the first term of instruction */
this->holdObject(term); /* save the starting term */
token = nextToken(); /* get the next token */
classId = token->classId; /* get the token class */
/* while cascading message sends */
while (classId == TOKEN_TILDE || classId == TOKEN_DTILDE || classId == TOKEN_SQLEFT )
{
if (classId == TOKEN_SQLEFT) /* left bracket form? */
{
term = this->collectionMessage(token, term, TERM_EOC);
}
else
{
/* process a message term */
term = this->message(term, classId == TOKEN_DTILDE, TERM_EOC);
}
token = nextToken(); /* get the next token */
classId = token->classId; /* get the token class */
}
previousToken(); /* push this term back */
}
/* return the message term (returns */
return term; /* OREF_NULL if not a message term) */
}
RexxObject *RexxSource::subTerm(
int terminators ) /* expression termination context */
/******************************************************************************/
/* Function: Parse off a subterm of an expression, from simple ones like */
/* variable names, to more complex such as message sends */
/******************************************************************************/
{
RexxToken *token; /* current token being processed */
RexxObject *term = OREF_NULL; /* parsed out term */
RexxToken *second; /* second token of term */
token = nextToken(); /* get the next token */
/* this the expression end? */
if (this->terminator(terminators, token))
{
return OREF_NULL; /* nothing to do here */
}
switch (token->classId)
{
case TOKEN_LEFT: /* have a left parentheses */
/* get the subexpression */
term = this->subExpression(((terminators | TERM_RIGHT) & ~TERM_SQRIGHT));
if (term == OREF_NULL) /* nothing found? */
{
/* this is an error */
syntaxError(Error_Invalid_expression_general, token);
}
second = nextToken(); /* get the terminator token */
/* not terminated by a right paren? */
if (second->classId != TOKEN_RIGHT)
{
/* this is an error */
syntaxErrorAt(Error_Unmatched_parenthesis_paren, token);
}
break;
case TOKEN_SYMBOL: /* Symbol in the expression */
case TOKEN_LITERAL: /* Literal in the expression */
second = nextToken(); /* get the next token */
/* have a function call? */
if (second->classId == TOKEN_LEFT)
{
/* process the function call */
term = this->function(second, token, terminators);
}
else
{
previousToken(); /* push the token back */
term = this->addText(token); /* variable or literal access */
}
break;
case TOKEN_RIGHT: /* have a right parentheses */
/* this is an error here */
syntaxError(Error_Unexpected_comma_paren);
break;
case TOKEN_COMMA: /* have a comma */
/* this is an error here */
syntaxError(Error_Unexpected_comma_comma);
break;
case TOKEN_SQRIGHT: /* have a right square bracket */
/* this is an error here */
syntaxError(Error_Unexpected_comma_bracket);
break;
case TOKEN_OPERATOR: /* operator token */
switch (token->subclass)
{ /* handle prefix operators as terms */
case OPERATOR_PLUS: /* prefix plus */
case OPERATOR_SUBTRACT: /* prefix minus */
case OPERATOR_BACKSLASH: /* prefix backslash */
previousToken(); /* put the token back */
return OREF_NULL; /* just return null (processed later)*/
default: /* other operators not allowed here */
/* this is an error */
syntaxError(Error_Invalid_expression_general, token);
}
break;
default: /* unknown thing in expression */
/* this is an error */
syntaxError(Error_Invalid_expression_general, token);
}
return term; /* return this term */
}
void RexxSource::pushTerm(
RexxObject *term ) /* term to push */
/******************************************************************************/
/* Function: Push a term onto the expression term stack */
/******************************************************************************/
{
this->terms->push(term); /* push the term on the stack */
this->currentstack++; /* step the stack depth */
/* new "high water" mark? */
if (this->currentstack > this->maxstack)
{
/* make it the highest point */
this->maxstack = this->currentstack;
}
}
RexxObject *RexxSource::popTerm()
/******************************************************************************/
/* Function: Pop a term off of the expression term stack */
/******************************************************************************/
{
RexxObject *term; /* returned term */
this->currentstack--; /* reduce the size count */
term = this->terms->pop(); /* pop the term */
this->holdObject(term); /* give it a little protection */
return term; /* and return it */
}
RexxObject *RexxSource::popNTerms(
size_t count ) /* number of terms to pop */
/******************************************************************************/
/* Function: Pop multiple terms off of the operator stack */
/******************************************************************************/
{
RexxObject *result = OREF_NULL; /* final popped element */
this->currentstack -= count; /* reduce the size count */
while (count--) /* while more to remove */
{
result = this->terms->pop(); /* pop the next item */
}
this->holdObject(result); /* protect this a little */
return result; /* and return it */
}
void RexxSource::isExposeValid()
/******************************************************************************/
/* Function: Validate placement of an EXPOSE instruction. The EXPOSE must */
/* be the first instruction and this must not be an interpret */
/* invocation. NOTE: labels are not allowed preceeding, as that */
/* will give a target for SIGNAL or CALL that will result in an */
/* invalid EXPOSE execution. */
/******************************************************************************/
{
if (this->flags&_interpret) /* is this an interpret? */
{
/* give the interpret error */
syntaxError(Error_Translation_expose_interpret);
}
/* not the first instruction? */
if (this->last->getType() != KEYWORD_FIRST)
{
/* general placement error */
syntaxError(Error_Translation_expose);
}
}
RexxArray *RexxSource::words(
RexxString *string) /* target string */
/******************************************************************************/
/* Function: Break up a string into an array of words for parsing and */
/* interpretation. */
/******************************************************************************/
{
RexxQueue *wordlist; /* created list of words */
RexxArray *wordarray; /* array version of the list */
RexxString *word; /* current word */
size_t count; /* count of words */
size_t i; /* loop counter */
wordlist = this->subTerms; /* use the subterms list */
/* get the first word */
word = ((RexxString *)(string->word(IntegerOne)))->upper();
word = this->commonString(word); /* get the common version of this */
wordlist->push(word); /* add to the word list */
count = 1; /* one word so far */
/* while still more words */
for (i = 3, word = (RexxString *)(string->word(IntegerTwo)); word->getLength() != 0; i++)
{
count++; /* have another word */
word = this->commonString(word); /* get the common version of this */
wordlist->push(word); /* add this word to the list */
/* get the next word */
word = (RexxString *)string->word(new_integer(i));
}
wordarray = new_array(count); /* get an array return value */
while (count > 0) /* while more words */
{
/* copy into the array */
wordarray->put(wordlist->pop(), count--);
}
return wordarray; /* return as an array */
}
void RexxSource::errorCleanup()
/******************************************************************************/
/* Function: Free up all of the parsing elements because of an error */
/******************************************************************************/
{
this->cleanup(); /* do needed cleanup */
}
void RexxSource::error(int errorcode)
/******************************************************************************/
/* Function: Raise an error caused by source translation problems. */
/******************************************************************************/
{
this->errorCleanup(); /* release any saved objects */
/* pass on the exception info */
ActivityManager::currentActivity->raiseException(errorcode, OREF_NULL, OREF_NULL, OREF_NULL);
}
void RexxSource::error(int errorcode, SourceLocation &location, RexxArray *subs)
/******************************************************************************/
/* Function: Raise an error caused by source translation problems. */
/******************************************************************************/
{
this->errorCleanup(); /* release any saved objects */
clauseLocation = location; // set the error location
/* pass on the exception info */
ActivityManager::currentActivity->raiseException(errorcode, OREF_NULL, subs, OREF_NULL);
}
void RexxSource::errorLine(
int errorcode, /* error to raise */
RexxInstruction *_instruction) /* instruction for the line number */
/******************************************************************************/
/* Function: Raise an error where one of the error message substitutions is */
/* the line number of another instruction object */
/******************************************************************************/
{
this->errorCleanup(); /* release any saved objects */
/* pass on the exception info */
ActivityManager::currentActivity->raiseException(errorcode, OREF_NULL, new_array(new_integer(_instruction->getLineNumber())), OREF_NULL);
}
void RexxSource::errorPosition(
int errorcode, /* error to raise */
RexxToken *token ) /* token value for description */
/******************************************************************************/
/* Function: Raise an error, displaying the location of a token associated */
/* with the error. */
/******************************************************************************/
{
SourceLocation token_location = token->getLocation(); /* get the token location */
this->errorCleanup(); /* release any saved objects */
/* pass on the exception info */
ActivityManager::currentActivity->raiseException(errorcode, OREF_NULL, new_array(new_integer(token_location.getOffset()), new_integer(token_location.getLineNumber())), OREF_NULL);
}
void RexxSource::errorToken(
int errorcode, /* error to raise */
RexxToken *token ) /* token value for description */
/******************************************************************************/
/* Function: Raise an error, displaying the value of a token in the error */
/* message. */
/******************************************************************************/
{
RexxString *value = token->value; /* get the token value */
if (value == OREF_NULL)
{
switch (token->classId)
{
case TOKEN_BLANK: /* blank operator */
value = new_string(" ", 1); /* use a blank */
break;
case TOKEN_EOC: /* source terminator */
value = new_string(";", 1); /* use a semicolon */
break;
case TOKEN_COMMA: /* comma */
value = new_string(",", 1); /* display a comma */
break;
case TOKEN_LEFT: /* left parentheses */
value = new_string("(", 1); /* display that */
break;
case TOKEN_RIGHT: /* right parentheses */
value = new_string(")", 1); /* display that */
break;
case TOKEN_SQLEFT: /* left square bracket */
value = new_string("[", 1); /* display that */
break;
case TOKEN_SQRIGHT: /* right square bracket */
value = new_string("]", 1); /* display that */
break;
case TOKEN_COLON: /* colon */
value = new_string(":", 1); /* display that */
break;
case TOKEN_TILDE: /* twiddle operator */
value = new_string("~", 1); /* display that */
break;
case TOKEN_DTILDE: /* double twiddle operator */
value = new_string("~~", 2); /* display that */
break;
case TOKEN_DCOLON: /* double colon operator */
value = new_string("::", 2); /* display that */
break;
default: /* ????? token */
/* just use a null string */
value = (RexxString *)OREF_NULLSTRING;
break;
}
}
this->errorCleanup(); /* release any saved objects */
/* pass on the exception info */
ActivityManager::currentActivity->raiseException(errorcode, OREF_NULL, new_array(value), OREF_NULL);
}
void RexxSource::error(
int errorcode, /* error to raise */
RexxObject *value ) /* value for description */
/******************************************************************************/
/* Function: Issue an error message with a single substitution parameter. */
/******************************************************************************/
{
this->errorCleanup(); /* release any saved objects */
/* pass on the exception info */
ActivityManager::currentActivity->raiseException(errorcode, OREF_NULL, new_array(value), OREF_NULL);
}
void RexxSource::error(
int errorcode, /* error to raise */
RexxObject *value1, /* first value for description */
RexxObject *value2 ) /* second value for description */
/******************************************************************************/
/* Function: Issue an error message with two substitution parameters. */
/******************************************************************************/
{
this->errorCleanup(); /* release any saved objects */
/* pass on the exception info */
ActivityManager::currentActivity->raiseException(errorcode, OREF_NULL, new_array(value1, value2), OREF_NULL);
}
void RexxSource::error(
int errorcode, /* error to raise */
RexxObject *value1, /* first value for description */
RexxObject *value2, /* second value for description */
RexxObject *value3 ) /* third value for description */
/****************************************************************************/
/* Function: Issue an error message with three substitution parameters. */
/****************************************************************************/
{
this->errorCleanup(); /* release any saved objects */
/* pass on the exception info */
ActivityManager::currentActivity->raiseException(errorcode, OREF_NULL, new_array(value1, value2, value3), OREF_NULL);
}
void RexxSource::blockError(
RexxInstruction *_instruction ) /* unclosed control instruction */
/******************************************************************************/
/* Function: Raise an error for an unclosed block instruction. */
/******************************************************************************/
{
// get the instruction location and set as the current error location
clauseLocation = this->last->getLocation();
switch (_instruction->getType())
{ /* issue proper message type */
case KEYWORD_DO: /* incomplete DO */
/* raise an error */
syntaxError(Error_Incomplete_do_do, _instruction);
break;
case KEYWORD_LOOP: /* incomplete LOOP */
/* raise an error */
syntaxError(Error_Incomplete_do_loop, _instruction);
break;
case KEYWORD_SELECT: /* incomplete SELECT */
syntaxError(Error_Incomplete_do_select, _instruction);
break;
case KEYWORD_OTHERWISE: /* incomplete SELECT */
syntaxError(Error_Incomplete_do_otherwise, _instruction);
break;
case KEYWORD_IF: /* incomplete IF */
case KEYWORD_IFTHEN: /* incomplete IF */
case KEYWORD_WHENTHEN: /* incomplete IF */
syntaxError(Error_Incomplete_do_then, _instruction);
break;
case KEYWORD_ELSE: /* incomplete ELSE */
syntaxError(Error_Incomplete_do_else, _instruction);
break;
}
}
void *RexxSource::operator new (size_t size)
/******************************************************************************/
/* Function: Create a new translator object from an array */
/******************************************************************************/
{
/* Get new object */
return new_object(sizeof(RexxSource), T_RexxSource);
}
RexxInstruction *RexxSource::sourceNewObject(
size_t size, /* Object size */
RexxBehaviour *_behaviour, /* Object's behaviour */
int type ) /* Type of instruction */
/******************************************************************************/
/* Function: Create a "raw" translator instruction object */
/******************************************************************************/
{
RexxObject *newObject = new_object(size); /* Get new object */
newObject->setBehaviour(_behaviour); /* Give new object its behaviour */
/* do common initialization */
new ((void *)newObject) RexxInstruction (this->clause, type);
/* now protect this */
OrefSet(this, this->currentInstruction, (RexxInstruction *)newObject);
return (RexxInstruction *)newObject; /* return the new object */
}
/**
* Parse a trace setting value into a decoded setting
* and the RexxActivation debug flag set to allow
* new trace settings to be processed more quickly.
*
* @param value The string source of the trace setting.
* @param newSetting The returned setting in binary form.
* @param debugFlags The debug flag representation of the trace setting.
*/
bool RexxSource::parseTraceSetting(RexxString *value, size_t &newSetting, size_t &debugFlags, char &badOption)
{
size_t setting = TRACE_IGNORE; /* don't change trace setting yet */
size_t debug = DEBUG_IGNORE; /* and the default debug change */
size_t length = value->getLength(); /* get the string length */
/* null string? */
if (length == 0)
{
setting = TRACE_NORMAL; /* use default trace setting */
debug = DEBUG_OFF; /* turn off debug mode */
}
else
{
/* start at the beginning */
/* while more length to process */
/* step one each character */
for (size_t _position = 0; _position < length; _position++)
{
/* process the next character */
switch (value->getChar(_position))
{
case '?': /* debug toggle character */
/* already toggling? */
if (debug == DEBUG_TOGGLE)
{
debug = DEBUG_IGNORE; /* this is back to no change at all */
}
else
{
debug = DEBUG_TOGGLE; /* need to toggle the debug mode */
}
continue; /* go loop again */
case 'a': /* TRACE ALL */
case 'A':
setting = TRACE_ALL;
break;
case 'c': /* TRACE COMMANDS */
case 'C':
setting = TRACE_COMMANDS;
break;
case 'l': /* TRACE LABELS */
case 'L':
setting = TRACE_LABELS;
break;
case 'e': /* TRACE ERRORS */
case 'E':
setting = TRACE_ERRORS;
break;
case 'f': /* TRACE FAILURES */
case 'F':
setting = TRACE_FAILURES;
break;
case 'n': /* TRACE NORMAL */
case 'N':
setting = TRACE_NORMAL;
break;
case 'o': /* TRACE OFF */
case 'O':
setting = TRACE_OFF;
break;
case 'r': /* TRACE RESULTS */
case 'R':
setting = TRACE_RESULTS;
break;
case 'i': /* TRACE INTERMEDIATES */
case 'I':
setting = TRACE_INTERMEDIATES;
break;
default: /* unknown trace setting */
// each context handles it's own error reporting, so give back the
// information needed for the message.
badOption = value->getChar(_position);
return false;
break;
}
break; /* non-prefix char found */
}
}
// return the merged setting
newSetting = setting | debug;
// create the activation-specific flags
debugFlags = RexxActivation::processTraceSetting(newSetting);
return true;
}
/**
* Format an encoded trace setting back into human readable form.
*
* @param setting The source setting.
*
* @return The string representation of the trace setting.
*/
RexxString * RexxSource::formatTraceSetting(size_t source)
{
char setting[3]; /* returned trace setting */
setting[0] = '\0'; /* start with a null string */
/* debug mode? */
if (source & DEBUG_ON)
{
setting[0] = '?'; /* add the question mark */
/* add current trace option */
setting[1] = (char)source&TRACE_SETTING_MASK;
/* create a string form */
return new_string(setting, 2);
}
else /* no debug prefix */
{
/* add current trace option */
setting[0] = (char)source&TRACE_SETTING_MASK;
/* create a string form */
return new_string(setting, 1);
}
}
size_t RexxSource::processVariableList(
int type ) /* type of instruction */
/****************************************************************************/
/* Function: Process a variable list for PROCEDURE, DROP, and USE */
/****************************************************************************/
{
RexxToken *token; /* current working token */
int list_count; /* count of variables in list */
RexxObject *retriever; /* variable retriever object */
list_count = 0; /* no variables yet */
token = nextReal(); /* get the first variable */
/* while not at the end of the clause*/
while (!token->isEndOfClause())
{
/* have a variable name? */
if (token->isSymbol())
{
/* non-variable symbol? */
if (token->subclass == SYMBOL_CONSTANT)
{
/* report the error */
syntaxError(Error_Invalid_variable_number, token);
}
else if (token->subclass == SYMBOL_DUMMY)
{
/* report the error */
syntaxError(Error_Invalid_variable_period, token);
}
retriever = this->addText(token);/* get a retriever for this */
this->subTerms->push(retriever); /* add to the variable list */
if (type == KEYWORD_EXPOSE) /* this an expose operation? */
{
this->expose(token->value); /* add to the expose list too */
}
list_count++; /* record the variable */
}
/* have a variable reference */
else if (token->classId == TOKEN_LEFT)
{
list_count++; /* record the variable */
token = nextReal(); /* get the next token */
/* not a symbol? */
if (!token->isSymbol())
{
/* must be a symbol here */
syntaxError(Error_Symbol_expected_varref);
}
/* non-variable symbol? */
if (token->subclass == SYMBOL_CONSTANT)
{
/* report the error */
syntaxError(Error_Invalid_variable_number, token);
}
else if (token->subclass == SYMBOL_DUMMY)
{
/* report the error */
syntaxError(Error_Invalid_variable_period, token);
}
retriever = this->addText(token);/* get a retriever for this */
/* make this an indirect reference */
retriever = (RexxObject *)new RexxVariableReference((RexxVariableBase *)retriever);
this->subTerms->queue(retriever);/* add to the variable list */
this->currentstack++; /* account for the varlists */
token = nextReal(); /* get the next token */
if (token->isEndOfClause()) /* nothing following? */
{
/* report the missing paren */
syntaxError(Error_Variable_reference_missing);
}
/* must be a right paren here */
else if (token->classId != TOKEN_RIGHT)
{
/* this is an error */
syntaxError(Error_Variable_reference_extra, token);
}
}
/* something bad.... */
else
{ /* this is invalid */
if (type == KEYWORD_DROP) /* DROP form? */
{
/* give appropriate message */
syntaxError(Error_Symbol_expected_drop);
}
else /* else give message for EXPOSEs */
{
syntaxError(Error_Symbol_expected_expose);
}
}
token = nextReal(); /* get the next variable */
}
if (list_count == 0)
{ /* no variables? */
if (type == KEYWORD_DROP) /* DROP form? */
{
/* give appropriate message */
syntaxError(Error_Symbol_expected_drop);
}
else /* else give message for EXPOSEs */
{
syntaxError(Error_Symbol_expected_expose);
}
}
return list_count; /* return the count */
}
RexxObject *RexxSource::parseConditional(
int *condition_type, /* type of condition */
int error_message ) /* extra "stuff" error message */
/******************************************************************************/
/* Function: Allow for WHILE or UNTIL keywords following some other looping */
/* construct. This returns SUBKEY_WHILE or SUBKEY_UNTIL to flag */
/* the caller that a conditional has been used. */
/******************************************************************************/
{
RexxToken *token; /* current working token */
int _keyword; /* keyword of parsed conditional */
RexxObject *_condition; /* parsed out condition */
_condition = OREF_NULL; /* default to no condition */
_keyword = 0; /* no conditional yet */
token = nextReal(); /* get the terminator token */
/* real end of instruction? */
if (!token->isEndOfClause())
{
/* may have WHILE/UNTIL */
if (token->isSymbol())
{
/* process the symbol */
switch (this->subKeyword(token) )
{