[SOLVED] Lex and YACC C++ namespace issue

MTK358 · 04-13-2011, 09:49 AM

I have a C++ library project, and it includes a Lex lexer and a YACC parser. Everything in the project is under a common namespace, with some parts in other namespaces under that. I want all the code generated by Lex and YACC to be under the namespace "lexyacc" under the common namespace.

I did it by putting these lines in the header parts of the Lex and YACC files:

Code:

namespace LANG_NAMESPACE { namespace lexyacc {

Tge problem is that when compiling, the code generated by Lex and YACC throws a huge about of errors about using types that don't exist (even though their header files are included). What do I do?

EDIT: here's a snippet from YACC's output:

Code:

/* Line 189 of yacc.c  */
#line 1 "/home/michael/Projects/lang/lib/yacc_parser.y"

	#include "config.hh"
	#include "node_call_param_list.hh"
	#include "node_func_param_list.hh"
	#include "nodes.hh"
	#include <iostream>
	#include "y.tab.hh"
	namespace LANG_NAMESPACE { namespace lexyacc {
	
	int yylex();
	void yyerror(char*);
	FILE *input;
	extern char *yytext;
	
	char *__parser_filename__;
	int __parser_line__;


<snip>

#if ! defined YYSTYPE && ! defined YYSTYPE_IS_DECLARED
typedef union YYSTYPE
{

/* Line 214 of yacc.c  */
#line 19 "/home/michael/Projects/lang/lib/yacc_parser.y"

	Node *node;
	NodeFuncParamList *fParam;
	NodeCallParamList *cParam;
	char *str;
	struct {
		char *name;
		Node *node;
	} nameNodePair;



/* Line 214 of yacc.c  */
#line 179 "/home/michael/Projects/lang/build/lib/y.tab.cc"
} YYSTYPE;

First is says "#include "nodes.hh"", and then it uses Node in the declaration of YYSTYPE. Tell me, how could Node possibly not have been defined?

David1357 · 04-13-2011, 02:18 PM

Quote:

Originally Posted by MTK358

Code:

namespace LANG_NAMESPACE { namespace lexyacc {

Did you remember to add the extra closing "}" for each name space?

I would suggest creating the smallest file that can duplicate the problem and posts the entire contents here. I was unable to understand what was going on in the small piece you posted.

MTK358 · 04-13-2011, 02:42 PM

Quote:

Originally Posted by David1357

Did you remember to add the extra closing "}" for each name space?

Of course.

Quote:

Originally Posted by David1357

I would suggest creating the smallest file that can duplicate the problem and posts the entire contents here. I was unable to understand what was going on in the small piece you posted.

Not really. This is purely a Lex/YACC issue. This kind of thing never happens when I write code manually.

MTK358 · 04-13-2011, 03:49 PM

Here are the Lex and YACC files, if that helps:

MTK358 · 04-14-2011, 02:07 PM

I fixed it by explicitly specifying the namespaces in %union.