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/***************************************************************************
* css.c
* Character-based parser for Css definitions
* Author - Iago Rubio <iagorubio(at)users.sourceforge.net>
* - Bronisław Białek <after89(at)gmail.com>
**************************************************************************/
#include "general.h"
#include <string.h>
#include <ctype.h>
#include "parse.h"
#include "read.h"
typedef enum eCssKinds {
K_NONE = -1, K_SELECTOR, K_ID, K_CLASS
} cssKind;
static kindOption CssKinds [] = {
{ TRUE, 's', "struct", "selectors" },
{ TRUE, 'v', "variable", "identities" },
{ TRUE, 'c', "class", "classes" }
};
typedef enum _CssParserState { /* state of parsing */
P_STATE_NONE, /* default state */
P_STATE_IN_COMMENT, /* into a comment, only multi line in CSS */
P_STATE_IN_SINGLE_STRING, /* into a single quoted string */
P_STATE_IN_DOUBLE_STRING, /* into a double quoted string */
P_STATE_IN_DEFINITION, /* on the body of the style definition, nothing for us */
P_STATE_IN_MEDIA, /* on a @media declaration, can be multi-line */
P_STATE_IN_IMPORT, /* on a @import declaration, can be multi-line */
P_STATE_IN_NAMESPACE, /* on a @namespace declaration */
P_STATE_IN_PAGE, /* on a @page declaration */
P_STATE_IN_FONTFACE, /* on a @font-face declaration */
P_STATE_AT_END /* end of parsing */
} CssParserState;
static void makeCssSimpleTag( vString *name, cssKind kind, boolean delete )
{
vStringTerminate (name);
makeSimpleTag (name, CssKinds, kind);
vStringClear (name);
if( delete )
vStringDelete (name);
}
static boolean isCssDeclarationAllowedChar( const unsigned char *cp )
{
return isalnum ((int) *cp) ||
isspace ((int) *cp) ||
*cp == '_' || /* allowed char */
*cp == '-' || /* allowed char */
*cp == '+' || /* allow all sibling in a single tag */
*cp == '>' || /* allow all child in a single tag */
*cp == '{' || /* allow the start of the declaration */
*cp == '.' || /* allow classes and selectors */
*cp == ',' || /* allow multiple declarations */
*cp == ':' || /* allow pseudo classes */
*cp == '*' || /* allow globs as P + * */
*cp == '#'; /* allow ids */
}
static CssParserState parseCssDeclaration( const unsigned char **position, cssKind kind, const char *aname)
{
const unsigned char *cp = *position;
vString *name = vStringNew ();
vStringCopyS(name, aname);
/* pick to the end of line including children and sibling
* if declaration is multiline go for the next line */
while ( isCssDeclarationAllowedChar(cp) ||
*cp == '\0' ) /* track the end of line into the loop */
{
if( *cp == ',' )
{
makeCssSimpleTag(name, kind, TRUE);
*position = cp;
return P_STATE_NONE;
}
else if( *cp == '{' || *cp == '\0' )
{ /* assume that line end is the same as a starting definition (i.e. the { is on the next line */
makeCssSimpleTag(name, kind, TRUE);
*position = cp;
return P_STATE_IN_DEFINITION;
}
vStringPut (name, (int) *cp);
++cp;
}
makeCssSimpleTag(name, kind, TRUE);
*position = cp;
return P_STATE_NONE;
}
static CssParserState parseCssLine( const unsigned char *line, CssParserState state )
{
vString *aux;
vString *stack = vStringNew ();
while( *line != '\0' ) /* fileReadLine returns NULL terminated strings */
{
vStringClear (stack);
while (state == P_STATE_NONE &&
(isspace ((int) *line) || isalnum ((int) *line) || ( *line == '*' && *(line-1) != '/' )))
{
if ((stack->length > 0 && isspace((int) *line)) || isalnum ((int) *line) || *line == '*') {
vStringPut(stack, (int) *line);
}
++line;
}
vStringTerminate (stack);
switch( state )
{
case P_STATE_NONE:
if( *line == '.' ) /* a class */
state = parseCssDeclaration( &line, K_CLASS, vStringValue(stack) );
else if( *line == '#' ) /* an id */
state = parseCssDeclaration( &line, K_ID, vStringValue(stack) );
else if( *line == '@' ) /* at-rules, we'll ignore them */
{
++line;
aux = vStringNew();
while( !isspace((int) *line) )
{
vStringPut (aux, (int) *line);
++line;
}
vStringTerminate (aux);
if( strcmp( aux->buffer, "media" ) == 0 )
state = P_STATE_IN_MEDIA;
else if ( strcmp( aux->buffer, "import" ) == 0 )
state = P_STATE_IN_IMPORT;
else if ( strcmp( aux->buffer, "namespace" ) == 0 )
state = P_STATE_IN_NAMESPACE;
else if ( strcmp( aux->buffer, "page" ) == 0 )
state = P_STATE_IN_PAGE;
else if ( strcmp( aux->buffer, "font-face" ) == 0 )
state = P_STATE_IN_FONTFACE;
vStringDelete (aux);
}
else if( *line == '*' && *(line-1) == '/' ) /* multi-line comment */
state = P_STATE_IN_COMMENT;
else if ( stack->length > 0 )
state = parseCssDeclaration( &line, K_SELECTOR, vStringValue(stack) );
break;
case P_STATE_IN_COMMENT:
if( *line == '/' && *(line-1) == '*')
state = P_STATE_NONE;
break;
case P_STATE_IN_SINGLE_STRING:
if( *line == '\'' && *(line-1) != '\\' )
state = P_STATE_IN_DEFINITION; /* PAGE, FONTFACE and DEFINITION are treated the same way */
break;
case P_STATE_IN_DOUBLE_STRING:
if( *line=='"' && *(line-1) != '\\' )
state = P_STATE_IN_DEFINITION; /* PAGE, FONTFACE and DEFINITION are treated the same way */
break;
case P_STATE_IN_MEDIA:
/* skip to start of media body or line end */
while( *line != '{' )
{
if( *line == '\0' )
break;
++line;
}
if( *line == '{' )
state = P_STATE_NONE;
break;
case P_STATE_IN_IMPORT:
case P_STATE_IN_NAMESPACE:
/* skip to end of declaration or line end */
while( *line != ';' )
{
if( *line == '\0' )
break;
++line;
}
if( *line == ';' )
state = P_STATE_NONE;
break;
case P_STATE_IN_PAGE:
case P_STATE_IN_FONTFACE:
case P_STATE_IN_DEFINITION:
if( *line == '\0' )
line = fileReadLine ();
if( *line == '}' )
state = P_STATE_NONE;
else if( *line == '\'' )
state = P_STATE_IN_SINGLE_STRING;
else if( *line == '"' )
state = P_STATE_IN_DOUBLE_STRING;
break;
case P_STATE_AT_END:
return state;
break;
}
if (line == NULL) return P_STATE_AT_END;
line++;
}
vStringDelete (stack);
return state;
}
static void findCssTags (void)
{
const unsigned char *line;
CssParserState state = P_STATE_NONE;
while ( (line = fileReadLine ()) != NULL )
{
state = parseCssLine( line, state );
if( state==P_STATE_AT_END ) return;
}
}
/* parser definition */
extern parserDefinition* CssParser (void)
{
static const char *const extensions [] = { "css", NULL };
parserDefinition* def = parserNew ("CSS");
def->kinds = CssKinds;
def->kindCount = KIND_COUNT (CssKinds);
def->extensions = extensions;
def->parser = findCssTags;
return def;
}