[Assorted-commits] SF.net SVN: assorted: [851] sandbox/trunk/src/flex-bison/lex-yacc-howto

[<yan...@us...>]

Revision: 851
          http://assorted.svn.sourceforge.net/assorted/?rev=851&view=rev
Author:   yangzhang
Date:     2008-06-03 10:32:50 -0700 (Tue, 03 Jun 2008)

Log Message:
-----------
added ex6

Added Paths:
-----------
    sandbox/trunk/src/flex-bison/lex-yacc-howto/ex6/
    sandbox/trunk/src/flex-bison/lex-yacc-howto/ex6/Makefile
    sandbox/trunk/src/flex-bison/lex-yacc-howto/ex6/ex6.l
    sandbox/trunk/src/flex-bison/lex-yacc-howto/ex6/ex6.y

Copied: sandbox/trunk/src/flex-bison/lex-yacc-howto/ex6/Makefile (from rev 848, sandbox/trunk/src/flex-bison/lex-yacc-howto/ex5/Makefile)
===================================================================
--- sandbox/trunk/src/flex-bison/lex-yacc-howto/ex6/Makefile	                        (rev 0)
+++ sandbox/trunk/src/flex-bison/lex-yacc-howto/ex6/Makefile	2008-06-03 17:32:50 UTC (rev 851)
@@ -0,0 +1,13 @@
+all: ex6
+
+%: %.tab.c %.yy.c
+	gcc -Wall -o $@ $^
+
+%.yy.c: %.l %.tab.h
+	flex -o $@ $<
+
+%.tab.c: %.y
+	bison -d $<
+
+%.tab.h: %.y
+	bison -d $<

Added: sandbox/trunk/src/flex-bison/lex-yacc-howto/ex6/ex6.l
===================================================================
--- sandbox/trunk/src/flex-bison/lex-yacc-howto/ex6/ex6.l	                        (rev 0)
+++ sandbox/trunk/src/flex-bison/lex-yacc-howto/ex6/ex6.l	2008-06-03 17:32:50 UTC (rev 851)
@@ -0,0 +1,22 @@
+%{
+// Note that this ordering is important; #define YYSTYPE must come before the
+// #include "ex6.tab.h"!
+#define YYSTYPE char *
+#include "ex6.tab.h"
+%}
+
+%option nounput
+
+%%
+
+zone                    return ZONETOK;
+file                    return FILETOK;
+[a-zA-Z][a-zA-Z0-9]*    yylval=strdup(yytext); return WORD;
+[a-zA-Z0-9\/.-]+        yylval=strdup(yytext); return FILENAME;
+\"                      return QUOTE;
+\{                      return OBRACE;
+\}                      return EBRACE;
+;                       return SEMICOLON;
+\n                      /* ignore EOL */;
+[ \t]+                  /* ignore whitespace */;
+%%

Added: sandbox/trunk/src/flex-bison/lex-yacc-howto/ex6/ex6.y
===================================================================
--- sandbox/trunk/src/flex-bison/lex-yacc-howto/ex6/ex6.y	                        (rev 0)
+++ sandbox/trunk/src/flex-bison/lex-yacc-howto/ex6/ex6.y	2008-06-03 17:32:50 UTC (rev 851)
@@ -0,0 +1,81 @@
+%{
+#include <stdio.h>
+#include <string.h>
+
+#define YYSTYPE char *
+
+int yylex(void);
+
+void yyerror(const char *str)
+{
+  fprintf(stderr,"error: %s\n",str);
+}
+
+int yywrap()
+{
+  return 1;
+}
+
+%}
+
+%token SEMICOLON ZONETOK OBRACE EBRACE QUOTE FILENAME WORD FILETOK
+
+%%
+
+commands:
+        |
+        commands command SEMICOLON
+        ;
+
+
+command:
+        zone_set 
+        ;
+
+zone_set:
+        ZONETOK quotedname zonecontent
+        {
+                printf("Complete zone for '%s' found\n",$2);
+        }
+        ;
+
+zonecontent:
+        OBRACE zonestatements EBRACE 
+
+quotedname:
+        QUOTE FILENAME QUOTE
+        {
+                $$=$2;
+        }
+
+zonestatements:
+        |
+        zonestatements zonestatement SEMICOLON
+        ;
+
+zonestatement:
+        statements
+        |
+        FILETOK quotedname 
+        {
+                printf("A zonefile name '%s' was encountered\n", $2);
+        }
+        ;
+
+block: 
+        OBRACE zonestatements EBRACE SEMICOLON
+        ;
+
+statements:
+        | statements statement
+        ;
+
+statement: WORD | block | quotedname
+
+%%
+
+int main()
+{
+  yyparse();
+  return 0;
+}


This was sent by the SourceForge.net collaborative development platform, the world's largest Open Source development site.