Question

I’m dealing with PHP grammar and I want to pass to my function the line number
I have something like:
internal_functions_in_yacc:

        T_ISSET '(' isset_variables ')'
    |   T_EMPTY '(' variable ')'
    |   T_INCLUDE expr  { observers.IncludeFound($2); } 
    |   T_INCLUDE_ONCE expr { observers.IncludeFound($2); } 
    |   T_EVAL '(' expr ')' 
    |   T_REQUIRE expr  { observers.IncludeFound($2); } 
    |   T_REQUIRE_ONCE expr { observers.IncludeFound($2); } 
;

Now I want to pass line number, something like

T_REQUIRE_ONCE expr { observers.IncludeFound($2,$line_number_here); } 

Is there a way to know line number of the token that bison is parsing? Or is it something that have to be done in lexing?

EDIT

I found lexing is done using rec2c not lex.

Answer 1

If line numbers are enabled then they can be accessed using @n with n being the tokens location.

T_REQUIRE_ONCE expr { observers.IncludeFound($2,@2.first_line); }

Edit:

To expand on the answer %locations is the directive in the link that enables line numbers in bison. The lexer is still responsible for incrementing the line numbers and requires %option yylineno.

Lex File:

\n       { yylloc->lines(yyleng); yylloc->step(); }