Re: pure bison and YYPARSE_PARAM

[Tim Van Holder]

> Hi all,
> 
> Using flex and bison in a pure context.
> 
> Flex generates yylex/2 lval as first arg and lloc as second
> 
> Specifying pure-parser in *.y file yields proper yylex calling.
> 
> However the flex example calles bison as
> 
>       yyparse( Lexer )
> 
> Where lexer is the datastructure allocated by yylex_init 
> containing the state 
> of the lex parser.
> 
> However yyparse generally has NO arguments EXCEPT if 
> YYPARSE_PARAM e.a. is 
> used.
> 
> However the info for bison states that his define is depreciated ... 
> 
> What is then the alternative to pass the lexer to the bison parser ?

In newer bison, use

  %parse-param {my_parse_context_t* my_parse_context}
  %lex-param   {my_lex_context_t* my_lex_context}

(one such entry per parameter to pass).
[[Info Nodes: {Parser Function}, {Pure Calling}]]

%parse-param also causes the same args to be added to yyerror() calls,
which answers your other question ('yyerror and pure parsers').
[[Info Node: {Error Reporting}]]

But note that there is a bug in bison 1.875 that breaks the use of
%lex-param (for the above example, bison would generate

  #define YYLEX yylex(, my_lex_context)

(unless yyloc & co were also being added).