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/* 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.
*
* $URL$
* $Id$
*
*/
/* String and parser handling */
#include "sci/resource.h"
#include "sci/engine/state.h"
#include "sci/engine/selector.h"
#include "sci/engine/message.h"
#include "sci/engine/kernel.h"
//#define DEBUG_PARSER
namespace Sci {
/*************************************************************/
/* Parser */
/**********/
reg_t kSaid(EngineState *s, int argc, reg_t *argv) {
reg_t heap_said_block = argv[0];
byte *said_block;
int new_lastmatch;
Vocabulary *voc = g_sci->getVocabulary();
#ifdef DEBUG_PARSER
const int debug_parser = 1;
#else
const int debug_parser = 0;
#endif
if (!heap_said_block.segment)
return NULL_REG;
said_block = (byte *)s->_segMan->derefBulkPtr(heap_said_block, 0);
if (!said_block) {
warning("Said on non-string, pointer %04x:%04x", PRINT_REG(heap_said_block));
return NULL_REG;
}
#ifdef DEBUG_PARSER
printf("Said block: ");
g_sci->getVocabulary()->debugDecipherSaidBlock(said_block);
#endif
if (voc->parser_event.isNull() || (readSelectorValue(s->_segMan, voc->parser_event, SELECTOR(claimed)))) {
return NULL_REG;
}
new_lastmatch = said(s, said_block, debug_parser);
if (new_lastmatch != SAID_NO_MATCH) { /* Build and possibly display a parse tree */
#ifdef DEBUG_PARSER
printf("kSaid: Match.\n");
#endif
s->r_acc = make_reg(0, 1);
if (new_lastmatch != SAID_PARTIAL_MATCH)
writeSelectorValue(s->_segMan, voc->parser_event, SELECTOR(claimed), 1);
} else {
return NULL_REG;
}
return s->r_acc;
}
reg_t kParse(EngineState *s, int argc, reg_t *argv) {
SegManager *segMan = s->_segMan;
reg_t stringpos = argv[0];
Common::String string = s->_segMan->getString(stringpos);
char *error;
ResultWordList words;
reg_t event = argv[1];
g_sci->checkVocabularySwitch();
Vocabulary *voc = g_sci->getVocabulary();
voc->parser_event = event;
reg_t params[2] = { voc->parser_base, stringpos };
bool res = voc->tokenizeString(words, string.c_str(), &error);
voc->parserIsValid = false; /* not valid */
if (res && !words.empty()) {
voc->synonymizeTokens(words);
s->r_acc = make_reg(0, 1);
#ifdef DEBUG_PARSER
debugC(2, kDebugLevelParser, "Parsed to the following blocks:");
for (ResultWordList::const_iterator i = words.begin(); i != words.end(); ++i)
debugC(2, kDebugLevelParser, " Type[%04x] Group[%04x]", i->_class, i->_group);
#endif
int syntax_fail = voc->parseGNF(words);
if (syntax_fail) {
s->r_acc = make_reg(0, 1);
writeSelectorValue(segMan, event, SELECTOR(claimed), 1);
invokeSelector(s, g_sci->getGameObject(), SELECTOR(syntaxFail), argc, argv, 2, params);
/* Issue warning */
debugC(2, kDebugLevelParser, "Tree building failed");
} else {
voc->parserIsValid = true;
writeSelectorValue(segMan, event, SELECTOR(claimed), 0);
#ifdef DEBUG_PARSER
voc->dumpParseTree();
#endif
}
} else {
s->r_acc = make_reg(0, 0);
// FIXME: When typing something wrong in the fanmade game Demo Quest,
// after the error dialog, the game checks for claimed to be 0 before
// showing a subsequent dialog. The following selector change causes
// it to be 1, thus causing the game to hang in an endless loop (bug
// #3038870. Thus, this seems to be wrong (since fanmade games use
// the original SCI interpreter), but we need to check against
// dissassembly. Since kParse is in the process of being dissassembled
// again, I'm leaving this FIXME in for now, so that it won't be
// forgotten :)
writeSelectorValue(segMan, event, SELECTOR(claimed), 1);
if (error) {
s->_segMan->strcpy(voc->parser_base, error);
debugC(2, kDebugLevelParser, "Word unknown: %s", error);
/* Issue warning: */
invokeSelector(s, g_sci->getGameObject(), SELECTOR(wordFail), argc, argv, 2, params);
free(error);
return make_reg(0, 1); /* Tell them that it didn't work */
}
}
return s->r_acc;
}
reg_t kSetSynonyms(EngineState *s, int argc, reg_t *argv) {
SegManager *segMan = s->_segMan;
reg_t object = argv[0];
List *list;
Node *node;
int script;
int numSynonyms = 0;
Vocabulary *voc = g_sci->getVocabulary();
// Only SCI0-SCI1 EGA games had a parser. In newer versions, this is a stub
if (getSciVersion() > SCI_VERSION_1_EGA)
return s->r_acc;
voc->clearSynonyms();
list = s->_segMan->lookupList(readSelector(segMan, object, SELECTOR(elements)));
node = s->_segMan->lookupNode(list->first);
while (node) {
reg_t objpos = node->value;
int seg;
script = readSelectorValue(segMan, objpos, SELECTOR(number));
seg = s->_segMan->getScriptSegment(script);
if (seg > 0)
numSynonyms = s->_segMan->getScript(seg)->getSynonymsNr();
if (numSynonyms) {
const byte *synonyms = s->_segMan->getScript(seg)->getSynonyms();
if (synonyms) {
debugC(2, kDebugLevelParser, "Setting %d synonyms for script.%d",
numSynonyms, script);
if (numSynonyms > 16384) {
error("Segtable corruption: script.%03d has %d synonyms",
script, numSynonyms);
/* We used to reset the corrupted value here. I really don't think it's appropriate.
* Lars */
} else
for (int i = 0; i < numSynonyms; i++) {
synonym_t tmp;
tmp.replaceant = (int16)READ_LE_UINT16(synonyms + i * 4);
tmp.replacement = (int16)READ_LE_UINT16(synonyms + i * 4 + 2);
voc->addSynonym(tmp);
}
} else
warning("Synonyms of script.%03d were requested, but script is not available", script);
}
node = s->_segMan->lookupNode(node->succ);
}
debugC(2, kDebugLevelParser, "A total of %d synonyms are active now.", numSynonyms);
return s->r_acc;
}
} // End of namespace Sci
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