gzdoom/src/parsecontext.h

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2016-03-01 15:47:10 +00:00
/*
** parsecontext.h
** Base class for Lemon-based parsers
**
**---------------------------------------------------------------------------
** Copyright 2008 Christoph Oelckers
** All rights reserved.
**
** Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions
** are met:
**
** 1. Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** 2. Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in the
** documentation and/or other materials provided with the distribution.
** 3. The name of the author may not be used to endorse or promote products
** derived from this software without specific prior written permission.
**
** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
**---------------------------------------------------------------------------
**
*/
#ifndef __PARSECONTEST__H_
#define __PARSECONTEST__H_
#include "tarray.h"
// The basic tokens the parser requires the grammar to understand
enum
{
OR =1,
XOR ,
AND ,
MINUS ,
PLUS ,
MULTIPLY ,
DIVIDE ,
MODULUS ,
NUM ,
FLOATVAL ,
LPAREN ,
RPAREN ,
SYM ,
RBRACE ,
LBRACE ,
COMMA ,
EQUALS ,
LBRACKET ,
RBRACKET ,
OR_EQUAL ,
COLON ,
SEMICOLON,
LSHASSIGN,
RSHASSIGN,
STRING ,
INCLUDE ,
DEFINE ,
};
#define DEFINE_TOKEN_TRANS(prefix) \
static int TokenTrans[] = { \
0, \
prefix##OR, \
prefix##XOR, \
prefix##AND, \
prefix##MINUS, \
prefix##PLUS, \
prefix##MULTIPLY, \
prefix##DIVIDE, \
prefix##MODULUS, \
prefix##NUM, \
prefix##FLOATVAL, \
prefix##LPAREN, \
prefix##RPAREN, \
prefix##SYM, \
prefix##RBRACE, \
prefix##LBRACE, \
prefix##COMMA, \
prefix##EQUALS, \
prefix##LBRACKET, \
prefix##RBRACKET, \
prefix##OR_EQUAL, \
prefix##COLON, \
prefix##SEMICOLON, \
prefix##LSHASSIGN, \
prefix##RSHASSIGN, \
prefix##STRING, \
prefix##INCLUDE, \
prefix##DEFINE, \
};
struct FParseSymbol
{
int Value;
char Sym[80];
};
union FParseToken
{
int val;
double fval;
char sym[80];
char string[80];
FParseSymbol *symval;
};
struct FParseContext;
typedef void (*ParseFunc)(void *pParser, int tokentype, FParseToken token, FParseContext *context);
struct FParseContext
{
TArray<FParseSymbol> symbols;
int SourceLine;
const char *SourceFile;
int EnumVal;
int *TokenTrans;
void *pParser;
ParseFunc Parse;
FParseContext(void *parser, ParseFunc parse, int *tt)
{
SourceLine = 0;
SourceFile = NULL;
pParser = parser;
Parse = parse;
TokenTrans = tt;
}
virtual ~FParseContext() {}
void AddSym (char *sym, int val);
bool FindSym (char *sym, FParseSymbol **val);
virtual bool FindToken (char *tok, int *type) = 0;
int GetToken (char *&sourcep, FParseToken *yylval);
int PrintError (const char *s);
void ParseLump(const char *lumpname);
};
#endif