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parser.cpp

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.

 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.

 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $URL: https://scummvm.svn.sourceforge.net/svnroot/scummvm/scummvm/tags/release-0-11-1/engines/parallaction/parser.cpp $
 * $Id: parser.cpp 30944 2008-02-23 22:50:18Z sev $
 *
 */

#include "parallaction/parallaction.h"


namespace Parallaction {

char              _tokens[20][40];

Script::Script(Common::ReadStream *input, bool disposeSource) : _input(input), _disposeSource(disposeSource), _line(0) {
}

Script::~Script() {
      if (_disposeSource)
            delete _input;
}

char *Script::readLine(char *buf, size_t bufSize) {

      uint16 _si;
      char v2 = 0;
      for ( _si = 0; _si<bufSize; _si++) {

            v2 = _input->readSByte();

            if (v2 == 0xA || v2 == 0xD || _input->eos()) break;
            if (!_input->eos() && _si < bufSize) buf[_si] = v2;
      }

      _line++;

      if (_si == 0 && _input->eos())
            return 0;

      buf[_si] = 0xA;
      buf[_si+1] = '\0';

      return buf;

}



void Script::clearTokens() {

      for (uint16 i = 0; i < 20; i++)
            _tokens[i][0] = '\0';

      return;

}

void Script::skip(const char* endToken) {

      while (scumm_stricmp(_tokens[0], endToken)) {
            readLineToken(true);
      }

}

//
//    Scans 's' until one of the stop-chars in 'brk' is found, building a token.
//    If the routine encounters quotes, it will extract the contained text and
//  make a proper token. When scanning inside quotes, 'brk' is ignored and
//  only newlines are considered stop-chars.
//
//    The routine returns the unparsed portion of the input string 's'.
//
char *parseNextToken(char *s, char *tok, uint16 count, const char *brk, bool ignoreQuotes) {

      enum STATES { NORMAL, QUOTED };

      STATES state = NORMAL;

      while (count > 0) {

            switch (state) {
            case NORMAL:
                  if (*s == '\0') {
                        *tok = '\0';
                        return s;
                  }

                  if (strchr(brk, *s)) {
                        *tok = '\0';
                        return ++s;
                  }

                  if (*s == '"') {
                        if (ignoreQuotes) {
                              *tok++ = *s++;
                              count--;
                        } else {
                              state = QUOTED;
                              s++;
                        }
                  } else {
                        *tok++ = *s++;
                        count--;
                  }
                  break;

            case QUOTED:
                  if (*s == '\0') {
                        *tok = '\0';
                        return s;
                  }
                  if (*s == '"' || *s == '\n' || *s == '\t') {
                        *tok = '\0';
                        return ++s;
                  }

                  *tok++ = *s++;
                  count--;
                  break;
            }

      }

      *tok = '\0';
      // TODO: if execution flows here, make *REALLY* sure everything has been parsed
      // out of the input string. This is what is supposed to happen, but never ever
      // allocated time to properly check.

      return tok;

}

uint16 Script::fillTokens(char* line) {

      uint16 i = 0;
      while (strlen(line) > 0 && i < 20) {
            line = parseNextToken(line, _tokens[i], 40, " \t\n");
            line = Common::ltrim(line);
            i++;
      }

      return i;
}

uint16 Script::readLineToken(bool errorOnEOF) {

      clearTokens();

      char buf[200];
      char *line = NULL;
      do {
            line = readLine(buf, 200);
            if (line == NULL) {
                  if (errorOnEOF)
                        error("unexpected end of file while parsing");
                  else
                        return 0;
            }
            line = Common::ltrim(line);
      } while (strlen(line) == 0 || line[0] == '#');

      return fillTokens(line);
}

} // namespace Parallaction

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