mirror of
https://github.com/ZDoom/gzdoom-gles.git
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212 lines
3.3 KiB
Text
212 lines
3.3 KiB
Text
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%{
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/* $Id: parser.y,v 1.9 2004/05/13 14:26:01 nuffer Exp $ */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <time.h>
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#include <string.h>
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#include <stdlib.h>
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#include <iostream>
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#include "globals.h"
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#include "parser.h"
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extern "C"
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{
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int yyparse();
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int yylex();
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void yyerror(char*);
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}
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static uint accept;
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static RegExp *spec;
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static Scanner *in;
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/* Bison version 1.875 emits a definition that is not working
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* with several g++ version. Hence we disable it here.
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*/
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#if defined(__GNUC__)
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#define __attribute__(x)
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#endif
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/* strdup() isn't standard C, so if we don't have it, we'll create our
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* own version
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*/
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#if !defined(HAVE_STRDUP)
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static char* strdup(const char* s)
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{
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char* rv = (char*)malloc(strlen(s) + 1);
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if (rv == NULL)
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return NULL;
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strcpy(rv, s);
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return rv;
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}
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#endif
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%}
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%start spec
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%union {
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Symbol *symbol;
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RegExp *regexp;
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Token *token;
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char op;
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ExtOp extop;
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};
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%token CLOSESIZE CLOSE ID CODE RANGE STRING
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%type <op> CLOSE
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%type <op> close
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%type <extop> CLOSESIZE
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%type <symbol> ID
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%type <token> CODE
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%type <regexp> RANGE STRING
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%type <regexp> rule look expr diff term factor primary
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%%
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spec :
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{ accept = 0;
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spec = NULL; }
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| spec rule
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{ spec = spec? mkAlt(spec, $2) : $2; }
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| spec decl
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;
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decl : ID '=' expr ';'
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{ if($1->re)
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in->fatal("sym already defined");
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$1->re = $3; }
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;
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rule : expr look CODE
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{ $$ = new RuleOp($1, $2, $3, accept++); }
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;
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look :
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{ $$ = new NullOp; }
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| '/' expr
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{ $$ = $2; }
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;
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expr : diff
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{ $$ = $1; }
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| expr '|' diff
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{ $$ = mkAlt($1, $3); }
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;
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diff : term
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{ $$ = $1; }
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| diff '\\' term
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{ $$ = mkDiff($1, $3);
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if(!$$)
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in->fatal("can only difference char sets");
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}
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;
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term : factor
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{ $$ = $1; }
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| term factor
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{ $$ = new CatOp($1, $2); }
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;
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factor : primary
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{ $$ = $1; }
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| primary close
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{
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switch($2){
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case '*':
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$$ = mkAlt(new CloseOp($1), new NullOp());
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break;
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case '+':
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$$ = new CloseOp($1);
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break;
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case '?':
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$$ = mkAlt($1, new NullOp());
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break;
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}
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}
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| primary CLOSESIZE
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{
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$$ = new CloseVOp($1, $2.minsize, $2.maxsize);
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}
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;
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close : CLOSE
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{ $$ = $1; }
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| close CLOSE
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{ $$ = ($1 == $2) ? $1 : '*'; }
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;
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primary : ID
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{ if(!$1->re)
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in->fatal("can't find symbol");
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$$ = $1->re; }
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| RANGE
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{ $$ = $1; }
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| STRING
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{ $$ = $1; }
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| '(' expr ')'
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{ $$ = $2; }
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;
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%%
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extern "C" {
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void yyerror(char* s){
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in->fatal(s);
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}
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int yylex(){
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return in->scan();
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}
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} // end extern "C"
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void line_source(unsigned int line, std::ostream& o)
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{
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char * fnamebuf;
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char * token;
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o << "#line " << line << " \"";
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if( fileName != NULL ) {
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fnamebuf = strdup( fileName );
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} else {
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fnamebuf = strdup( "<stdin>" );
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}
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token = strtok( fnamebuf, "\\" );
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for(;;) {
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o << token;
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token = strtok( NULL, "\\" );
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if( token == NULL ) break;
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o << "\\\\";
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}
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o << "\"\n";
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++oline;
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free( fnamebuf );
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}
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void parse(std::istream& i, std::ostream &o){
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o << "/* Generated by re2c " PACKAGE_VERSION " on ";
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time_t now = time(&now);
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o.write(ctime(&now), 24);
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o << " */\n";
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oline += 2;
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in = new Scanner(i);
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line_source(in->line(), o);
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while(in->echo(o)){
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yyparse();
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if(spec)
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genCode(o, spec);
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line_source(in->line(), o);
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}
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}
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