/* This file is #include'd at the top of a Lex/Flex scanner for use with the Lemon parser. You must have #define'd: LVAL name of lval variable LVAL_TYPE type of lval variable LVAL_INIT_VAL Initial value of lval variable */ /* Flex has a few routines which help us get the scanner to read * from a string rather than from a file. POSIX lex only provides * for reading from a file; any method of reading from a string * is inherently non-portable. Besides reading from a string, * we have to worry about resetting the scanner after a bad * parse; this too is non-portable. Combine the reset with * a string input, and you have major non-portability. I'll provide * the routines for flex here. If you really want to modify the * scanner and use a non-flex lex implementation, you may * add more ifdef's below. */ /* If we don't need yyunput, use this macro to get it out of the * generated C file, avoiding a compiler warning about its lack of use */ #define YY_NO_UNPUT 1 /* Yup, I'm using a non-standard type for lval, unlike usual lex/yacc implementations. * I can do so because I'm *not* using yacc, I'm using Lemon, where I have * more control of the interaction between scanner and parser. */ LVAL_TYPE LVAL = LVAL_INIT_VAL;