Textual Positions of Tokens --------------------------- If you are using the `@N'-feature (*note Tracking Locations: Locations.) in actions to keep track of the textual locations of tokens and groupings, then you must provide this information in `yylex'. The function `yyparse' expects to find the textual location of a token just parsed in the global variable `yylloc'. So `yylex' must store the proper data in that variable. By default, the value of `yylloc' is a structure and you need only initialize the members that are going to be used by the actions. The four members are called `first_line', `first_column', `last_line' and `last_column'. Note that the use of this feature makes the parser noticeably slower. The data type of `yylloc' has the name `YYLTYPE'.
Dirfile and infopages generated Sat Dec 3 02:07:54 2005