yacc

A piece of code of my gramamar its driveing me crazy. I have to write a grammar that allow write functions with multiple inputs e.g. function begin a: <statments> b: <statements> end The problem with that its that is statements that are assignments like this ID = Expresion. in the following quote you can see the output produced by yacc. 0 $accept : InstanciasFuncion $end 1 InstanciasFuncion : InstanciasFuncion InstanciaFuncion 2 | InstanciaFuncion 3 InstanciaFuncion : PuntoEntrada Sentencias 4 PuntoEntrada : ID ':' 5 Sentencias : Sentencias Sentencia 6 | Sentencia 7 Sentencia : ID '=' ID State

All, Developing a validating application for embedded sql i'll use ansi c or c++ as developement language Where do i get an sql grammar for lex and yacc? Aymanadou hi there is a solution in google projects yaxx: yac file : lex file enjoy Umair There is book named "flex & bison" by John Levine (Author). in this book there is a complete chapter for sql parser. you can download this book for free here 来源： https://stackoverflow.com/questions/8656926/sql-lex-yacc-grammar

I am trying to build a Lisp grammar. Easy, right? Apparently not. I present these inputs and receive errors... ( 1 1) 23 23 23 ui ui This is the grammar... %% sexpr: atom {printf("matched sexpr\n");} | list ; list: '(' members ')' {printf("matched list\n");} | '('')' {printf("matched empty list\n");} ; members: sexpr {printf("members 1\n");} | sexpr members {printf("members 2\n");} ; atom: ID {printf("ID\n");} | NUM {printf("NUM\n");} | STR {printf("STR\n");} ; %% As near as I can tell, I need a single non-terminal defined as a program, upon which the whole parse tree can hang. But I tried it

I've used lex and yacc (more usually bison) in the past for various projects, usually translators (such as a subset of EDIF streamed into an EDA app). Additionally, I've had to support code based on lex/yacc grammars dating back decades. So I know my way around the tools, though I'm no expert. I've seen positive comments about Antlr in various fora in the past, and I'm curious as to what I may be missing. So if you've used both, please tell me what's better or more advanced in Antlr. My current constraints are that I work in a C++ shop, and any product we ship will not include Java, so the

I am trying to include a struct as part of the union with Bison, but I get an error on the 'struct node args' in %union: parser.y:17: error: field ‘args’ has incomplete type The Code: struct node { char * val; struct node * next; }; %} %union { char * string; struct node args; } %token <string> CD WORD PWD EXIT %type <args> arg_list Anyone know what I am doing wrong? Even better, use the %code directive with the "requires" option, i.e.: %code requires { struct node { char * val; struct node * next; }; } %union { char * string; struct node args; } This will include the code in the "requires"

Is there an implementation of Lex and Yacc in PHP? If not, can anyone suggest a lexical analyser and parser generator (ie, anything like Lex and Yacc) that will create PHP code. I'm not too worried about the performance of the resulting parser. I am sick of using regex to parse things that really shouldn't be parsed with regex... There's JLexPHP: https://github.com/wez/JLexPHP/blob/master/jlex.php I've not used it, but there's this: http://pear.php.net/package/PHP_ParserGenerator , which creates a PHP Parser from a Lemon grammar. The project seems to be inactive though. I also found this