aboutsummaryrefslogtreecommitdiff
path: root/engines/sci/engine/kparse.cpp
blob: f85f33e3e8a59660506c1f770899713c9937bd77 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
/* 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.
 *
 */

/* 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.getSegment())
		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
		debugN("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(said_block, debug_parser);
	if (new_lastmatch  != SAID_NO_MATCH) { /* Build and possibly display a parse tree */

#ifdef DEBUG_PARSER
		debugN("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;
	reg_t event = argv[1];
	g_sci->checkVocabularySwitch();
	Vocabulary *voc = g_sci->getVocabulary();
	voc->parser_event = event;
	reg_t params[2] = { s->_segMan->getParserPtr(), stringpos };

	ResultWordListList words;
	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(kDebugLevelParser, "Parsed to the following blocks:");

		for (ResultWordListList::const_iterator i = words.begin(); i != words.end(); ++i) {
			debugCN(2, kDebugLevelParser, "   ");
			for (ResultWordList::const_iterator j = i->begin(); j != i->end(); ++j) {
				debugCN(2, kDebugLevelParser, "%sType[%04x] Group[%04x]", j == i->begin() ? "" : " / ", j->_class, j->_group);
			}
			debugCN(2, kDebugLevelParser, "\n");
		}
#endif

		voc->replacePronouns(words);

		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(kDebugLevelParser, "Tree building failed");

		} else {
			voc->parserIsValid = true;
			voc->storePronounReference();
			writeSelectorValue(segMan, event, SELECTOR(claimed), 0);

#ifdef DEBUG_PARSER
			voc->dumpParseTree();
#endif
		}

	} else {

		s->r_acc = make_reg(0, 0);
		writeSelectorValue(segMan, event, SELECTOR(claimed), 1);

		if (error) {
			s->_segMan->strcpy(s->_segMan->getParserPtr(), error);
			debugC(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_ONLY)
		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(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 = READ_LE_UINT16(synonyms + i * 4);
						tmp.replacement = 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(kDebugLevelParser, "A total of %d synonyms are active now.", numSynonyms);

	return s->r_acc;
}

} // End of namespace Sci