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Allow a user specified parameter to 'yyparse()', in a manner similar to

Browse source 
that used by bison.  The names are consistent with the bison implementation
but this one also allows the type of the parameter to be specified.

For a desired prototype of:

	int yyparse __P((struct yyresult *));

and compile like this:

	yacc -dv grammar.y
	cc -c -DYYPARSE_PARAM_TYPE="struct yyresult *" \
	      -DYYPARSE_PARAM="parm" y.tab.c

and use like this:

	${
	#include "usrtypes.h"
	#include "usrproto.h"
	}$

	%token NUMBER

	%%

	goal : NUMBER
		{
		parm->value = yylval;
		} ;

If YYPARSE_PARAM_TYPE isn't specified then "void *" is the default type.
If YYPARSE_PARAM is not specified then the generated code behaves exactly
as traditional byacc.

PR:		13562
Submitted by:	W Gerald Hicks <wghicks@bellsouth.net>
This commit is contained in:
David E. O'Brien 1999-10-27 17:51:37 +00:00
parent 6877f580de
commit c3584b3b4e
1 changed files with 11 additions and 8 deletions
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19
usr.bin/yacc/skeleton.c
View file

@ -67,10 +67,6 @@ char *banner[] =
"#define yyclearin (yychar=(YYEMPTY))",
"#define yyerrok (yyerrflag=0)",
"#define YYRECOVERING() (yyerrflag!=0)",
#if 0
"extern int yylex();",
"extern int yyparse();",
#endif
"static int yygrowstack();",
0
};
@ -163,12 +159,19 @@ char *body[] =
"#define YYACCEPT goto yyaccept",
"#define YYERROR goto yyerrlab",
"",
"int",
"#if defined(__cplusplus) || __STDC__",
"yyparse(void)",
"#ifndef YYPARSE_PARAM",
"#define YYPARSE_PARAM",
"#define YYPARSE_PARAM_DECL",
"#else",
"yyparse()",
"#ifndef YYPARSE_PARAM_TYPE",
"#define YYPARSE_PARAM_TYPE void *",
"#endif",
"#define YYPARSE_PARAM_DECL YYPARSE_PARAM_TYPE YYPARSE_PARAM;",
"#endif",
"",
"int",
"yyparse (YYPARSE_PARAM)",
" YYPARSE_PARAM_DECL",
"{",
" register int yym, yyn, yystate;",
"#if YYDEBUG",