[Redbutton-devel] SF.net SVN: redbutton: [344] redbutton-author/trunk/ccc.y

[<ski...@us...>]

Revision: 344
          http://redbutton.svn.sourceforge.net/redbutton/?rev=344&view=rev
Author:   skilvington
Date:     2007-08-24 01:56:51 -0700 (Fri, 24 Aug 2007)

Log Message:
-----------
add -l flag to select lexer or grammar output

Modified Paths:
--------------
    redbutton-author/trunk/ccc.y

Modified: redbutton-author/trunk/ccc.y
===================================================================
--- redbutton-author/trunk/ccc.y	2007-08-23 18:50:46 UTC (rev 343)
+++ redbutton-author/trunk/ccc.y	2007-08-24 08:56:51 UTC (rev 344)
@@ -1,4 +1,5 @@
 %{
+#include <unistd.h>
 #include <stdio.h>
 #include <string.h>
 #include <stdbool.h>
@@ -50,6 +51,9 @@
 	struct buf oneormores;	/* grammar section for Identifier+ rules */
 } state;
 
+void usage(char *);
+void fatal(char *);
+
 void add_item(enum item_type, char *);
 
 void output_def(char *);
@@ -158,8 +162,28 @@
 
 /* here we go ... */
 int
-main(void)
+main(int argc, char *argv[])
 {
+	char *prog_name = argv[0];
+	/* by default output the grammar */
+	bool show_lexer = false;
+	int arg;
+
+	while((arg = getopt(argc, argv, "l")) != EOF)
+	{
+		switch(arg)
+		{
+		case 'l':
+			show_lexer = true;
+			break;
+
+		default:
+			usage(prog_name);
+			break;
+		}
+	}
+
+	if(optind == argc)
 	state.items = NULL;
 	buf_init(&state.lexer);
 	state.tokens = NULL;
@@ -168,20 +192,33 @@
 
 	yyparse();
 
-	printf("-- lex --\n");
-	printf("%s", state.lexer.str);
+	if(show_lexer)
+	{
+		/* output lexer */
+		printf("%s", state.lexer.str);
+	}
+	else
+	{
+		/* output grammar */
+		print_tokens(state.tokens);
+		printf("%%%%\n");
+		printf("%s", state.grammar.str);
+		printf("%s", state.oneormores.str);
+		printf("%%%%\n");
+	}
 
-	printf("-- yacc --\n");
-	print_tokens(state.tokens);
-	printf("%%%%\n");
-	printf("%s", state.grammar.str);
-	printf("%s", state.oneormores.str);
-	printf("%%%%\n");
-
 	return EXIT_SUCCESS;
 }
 
 void
+usage(char *prog_name)
+{
+	fprintf(stderr, "Syntax: %s [-l]\n", prog_name);
+
+	exit(EXIT_FAILURE);
+}
+
+void
 fatal(char *str)
 {
 	yyerror(str);


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