mirror of
https://github.com/ZDoom/qzdoom.git
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6d28aa3541
This function will truncate everything that is larger than LONG_MAX or smaller than LONG_MIN to fit into a long variable, but longs are 32 bit on Windows and 64 bit elsewhere, so to ensure consistency and the ability to parse larger values better use strtoll which does not truncate 32 bit values.
356 lines
7.7 KiB
C++
356 lines
7.7 KiB
C++
/*
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** parsecontext.cpp
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** Base class for Lemon-based parsers
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**
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**---------------------------------------------------------------------------
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** Copyright 1998-2008 Randy Heit
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** Copyright 2008 Christoph Oelckers
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** All rights reserved.
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**
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** Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions
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** are met:
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**
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** 1. Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** 2. Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in the
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** documentation and/or other materials provided with the distribution.
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** 3. The name of the author may not be used to endorse or promote products
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** derived from this software without specific prior written permission.
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**
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** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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**---------------------------------------------------------------------------
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**
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*/
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#include <string.h>
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#include <ctype.h>
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#include "w_wad.h"
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#include "parsecontext.h"
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#include "p_lnspec.h"
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//==========================================================================
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//
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//
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//
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//==========================================================================
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void FParseContext::AddSym (char *sym, int val)
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{
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FParseSymbol syme;
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syme.Value = val;
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strncpy (syme.Sym, sym, 79);
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syme.Sym[79]=0;
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symbols.Push(syme);
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}
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//==========================================================================
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//
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//
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//
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//==========================================================================
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bool FParseContext::FindSym (char *sym, FParseSymbol **val)
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{
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for(unsigned i=0;i<symbols.Size(); i++)
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{
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if (strcmp (symbols[i].Sym, sym) == 0)
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{
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*val = &symbols[i];
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return true;
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}
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}
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return false;
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}
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//==========================================================================
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//
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//
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//
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//==========================================================================
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int FParseContext::GetToken (char *&sourcep, FParseToken *yylval)
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{
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char token[80];
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int toksize;
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int c;
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loop:
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while (isspace (c = *sourcep++) && c != 0)
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{
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if (c == '\n')
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SourceLine++;
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}
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if (c == 0)
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{
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return 0;
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}
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if (isdigit (c))
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{
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int buildup = c - '0';
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if (c == '0')
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{
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c = *sourcep++;
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if (c == 'x' || c == 'X')
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{
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yylval->val = (int)strtoll(sourcep, &sourcep, 16);
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return TokenTrans[NUM];
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}
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else
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{
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sourcep--;
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}
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}
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char *endp;
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sourcep--;
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yylval->val = (int)strtoll(sourcep, &endp, 10);
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if (*endp == '.')
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{
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// It's a float
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yylval->fval = strtod(sourcep, &sourcep);
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return TokenTrans[FLOATVAL];
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}
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else
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{
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sourcep = endp;
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return TokenTrans[NUM];
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}
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}
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if (isalpha (c))
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{
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int buildup = 0;
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token[0] = c;
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toksize = 1;
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while (toksize < 79 && (isalnum (c = *sourcep++) || c == '_'))
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{
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token[toksize++] = c;
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}
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token[toksize] = 0;
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if (toksize == 79 && isalnum (c))
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{
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while (isalnum (c = *sourcep++))
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;
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}
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sourcep--;
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if (FindToken (token, &buildup))
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{
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return buildup;
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}
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if (FindSym (token, &yylval->symval))
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{
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yylval->val = yylval->symval->Value;
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return TokenTrans[NUM];
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}
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if ((yylval->val = P_FindLineSpecial(token)) != 0)
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{
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return TokenTrans[NUM];
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}
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#if __GNUC__ == 4 && __GNUC_MINOR__ == 8
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// Work around GCC 4.8 bug 54570 causing release build crashes.
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asm("" : "+g" (yylval));
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#endif
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strcpy (yylval->sym, token);
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return TokenTrans[SYM];
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}
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if (c == '/')
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{
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c = *sourcep++;
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if (c == '*')
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{
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for (;;)
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{
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while ((c = *sourcep++) != '*' && c != 0)
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{
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if (c == '\n')
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SourceLine++;
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}
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if (c == 0)
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return 0;
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if ((c = *sourcep++) == '/')
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goto loop;
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if (c == 0)
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return 0;
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sourcep--;
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}
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}
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else if (c == '/')
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{
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while ((c = *sourcep++) != '\n' && c != 0)
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;
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if (c == '\n')
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SourceLine++;
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else if (c == EOF)
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return 0;
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goto loop;
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}
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else
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{
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sourcep--;
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return TokenTrans[DIVIDE];
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}
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}
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if (c == '"')
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{
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int tokensize = 0;
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while ((c = *sourcep++) != '"' && c != 0)
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{
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yylval->string[tokensize++] = c;
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}
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yylval->string[tokensize] = 0;
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return TokenTrans[STRING];
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}
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if (c == '|')
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{
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c = *sourcep++;
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if (c == '=')
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return TokenTrans[OR_EQUAL];
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sourcep--;
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return TokenTrans[OR];
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}
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if (c == '<')
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{
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c = *sourcep++;
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if (c == '<')
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{
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c = *sourcep++;
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if (c == '=')
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{
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return TokenTrans[LSHASSIGN];
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}
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sourcep--;
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return 0;
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}
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c--;
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return 0;
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}
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if (c == '>')
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{
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c = *sourcep++;
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if (c == '>')
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{
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c = *sourcep++;
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if (c == '=')
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{
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return TokenTrans[RSHASSIGN];
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}
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sourcep--;
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return 0;
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}
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c--;
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return 0;
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}
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if (c == '#')
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{
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if (!strnicmp(sourcep, "include", 7))
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{
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sourcep+=7;
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return TokenTrans[INCLUDE];
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}
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if (!strnicmp(sourcep, "define", 6))
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{
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sourcep+=6;
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return TokenTrans[DEFINE];
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}
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}
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switch (c)
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{
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case '^': return TokenTrans[XOR];
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case '&': return TokenTrans[AND];
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case '-': return TokenTrans[MINUS];
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case '+': return TokenTrans[PLUS];
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case '*': return TokenTrans[MULTIPLY];
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case '%': return TokenTrans[MODULUS];
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case '(': return TokenTrans[LPAREN];
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case ')': return TokenTrans[RPAREN];
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case ',': return TokenTrans[COMMA];
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case '{': return TokenTrans[LBRACE];
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case '}': return TokenTrans[RBRACE];
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case '=': return TokenTrans[EQUALS];
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case ';': return TokenTrans[SEMICOLON];
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case ':': return TokenTrans[COLON];
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case '[': return TokenTrans[LBRACKET];
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case ']': return TokenTrans[RBRACKET];
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default: return 0;
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}
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}
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//==========================================================================
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//
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//
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//
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//==========================================================================
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int FParseContext::PrintError (const char *s)
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{
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if (SourceFile != NULL)
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Printf ("%s, line %d: %s\n", SourceFile, SourceLine, s);
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else
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Printf ("%s\n", s);
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return 0;
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}
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//==========================================================================
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//
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//
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//
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//==========================================================================
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void FParseContext::ParseLump(const char *lumpname)
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{
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int tokentype;
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int SavedSourceLine = SourceLine;
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const char *SavedSourceFile = SourceFile;
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FParseToken token;
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int lumpno = Wads.CheckNumForFullName(lumpname, true);
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if (lumpno == -1)
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{
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Printf ("%s, line %d: Lump '%s' not found\n", SourceFile, SourceLine, lumpname);
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return;
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}
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// Read the lump into a buffer and add a 0-terminator
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int lumplen = Wads.LumpLength(lumpno);
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char *lumpdata = new char[lumplen+1];
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Wads.ReadLump(lumpno, lumpdata);
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lumpdata[lumplen] = 0;
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SourceLine = 0;
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SourceFile = lumpname;
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char *sourcep = lumpdata;
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while ( (tokentype = GetToken(sourcep, &token)) )
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{
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// It is much easier to handle include statements outside the main parser.
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if (tokentype == TokenTrans[INCLUDE])
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{
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if (GetToken(sourcep, &token) != TokenTrans[STRING])
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{
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Printf("%s, line %d: Include: String parameter expected\n", SourceFile, SourceLine);
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return;
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}
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ParseLump(token.string);
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}
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else
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{
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Parse(pParser, tokentype, token, this);
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}
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}
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delete [] lumpdata;
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SourceLine = SavedSourceLine;
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SourceFile = SavedSourceFile;
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}
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