Source Code Cross Referenced for ValidWhenParser.java in  » Web-Framework » struts-1.3.8 » org » apache » struts » validator » validwhen » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Framework » struts 1.3.8 » org.apache.struts.validator.validwhen 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        // $ANTLR 2.7.2: "ValidWhenParser.g" -> "ValidWhenParser.java"$
002:
003:        /*
004:         * $Id: ValidWhenParser.java 504715 2007-02-07 22:10:26Z bayard $
005:         *
006:         * Licensed to the Apache Software Foundation (ASF) under one
007:         * or more contributor license agreements.  See the NOTICE file
008:         * distributed with this work for additional information
009:         * regarding copyright ownership.  The ASF licenses this file
010:         * to you under the Apache License, Version 2.0 (the
011:         * "License"); you may not use this file except in compliance
012:         * with the License.  You may obtain a copy of the License at
013:         *
014:         *  http://www.apache.org/licenses/LICENSE-2.0
015:         *
016:         * Unless required by applicable law or agreed to in writing,
017:         * software distributed under the License is distributed on an
018:         * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
019:         * KIND, either express or implied.  See the License for the
020:         * specific language governing permissions and limitations
021:         * under the License.
022:         */
023:
024:        package org.apache.struts.validator.validwhen;
025:
026:        import java.util.Stack;
027:        import org.apache.commons.validator.util.ValidatorUtils;
028:
029:        import antlr.TokenBuffer;
030:        import antlr.TokenStreamException;
031:        import antlr.TokenStreamIOException;
032:        import antlr.ANTLRException;
033:        import antlr.LLkParser;
034:        import antlr.Token;
035:        import antlr.TokenStream;
036:        import antlr.RecognitionException;
037:        import antlr.NoViableAltException;
038:        import antlr.MismatchedTokenException;
039:        import antlr.SemanticException;
040:        import antlr.ParserSharedInputState;
041:        import antlr.collections.impl.BitSet;
042:
043:        public class ValidWhenParser extends antlr.LLkParser implements 
044:                ValidWhenParserTokenTypes {
045:            Stack argStack = new Stack();
046:            Object form;
047:            int index;
048:            String value;
049:
050:            public void setForm(Object f) {
051:                form = f;
052:            };
053:
054:            public void setIndex(int i) {
055:                index = i;
056:            };
057:
058:            public void setValue(String v) {
059:                value = v;
060:            };
061:
062:            public boolean getResult() {
063:                return ((Boolean) argStack.peek()).booleanValue();
064:            }
065:
066:            private final int LESS_EQUAL = 0;
067:            private final int LESS_THAN = 1;
068:            private final int EQUAL = 2;
069:            private final int GREATER_THAN = 3;
070:            private final int GREATER_EQUAL = 4;
071:            private final int NOT_EQUAL = 5;
072:            private final int AND = 6;
073:            private final int OR = 7;
074:
075:            private boolean evaluateComparison(Object v1, Object compare,
076:                    Object v2) {
077:                boolean intCompare = true;
078:                if ((v1 == null) || (v2 == null)) {
079:                    if (String.class.isInstance(v1)) {
080:                        if (((String) v1).length() == 0) {
081:                            v1 = null;
082:                        }
083:                    }
084:                    if (String.class.isInstance(v2)) {
085:                        if (((String) v2).length() == 0) {
086:                            v2 = null;
087:                        }
088:                    }
089:                    switch (((Integer) compare).intValue()) {
090:                    case LESS_EQUAL:
091:                    case GREATER_THAN:
092:                    case LESS_THAN:
093:                    case GREATER_EQUAL:
094:                        return false;
095:                    case EQUAL:
096:                        return (v1 == v2);
097:                    case NOT_EQUAL:
098:                        return (v1 != v2);
099:                    }
100:                }
101:                if ((Integer.class.isInstance(v1) || String.class
102:                        .isInstance(v1))
103:                        && (Integer.class.isInstance(v2) || String.class
104:                                .isInstance(v2))) {
105:                    intCompare = true;
106:                } else {
107:                    intCompare = false;
108:                }
109:                if (intCompare) {
110:                    try {
111:                        int v1i = 0, v2i = 0;
112:                        if (Integer.class.isInstance(v1)) {
113:                            v1i = ((Integer) v1).intValue();
114:                        } else {
115:                            v1i = Integer.parseInt((String) v1);
116:                        }
117:                        if (Integer.class.isInstance(v2)) {
118:                            v2i = ((Integer) v2).intValue();
119:                        } else {
120:                            v2i = Integer.parseInt((String) v2);
121:                        }
122:                        switch (((Integer) compare).intValue()) {
123:                        case LESS_EQUAL:
124:                            return (v1i <= v2i);
125:
126:                        case LESS_THAN:
127:                            return (v1i < v2i);
128:
129:                        case EQUAL:
130:                            return (v1i == v2i);
131:
132:                        case GREATER_THAN:
133:                            return (v1i > v2i);
134:
135:                        case GREATER_EQUAL:
136:                            return (v1i >= v2i);
137:
138:                        case NOT_EQUAL:
139:                            return (v1i != v2i);
140:                        }
141:                    } catch (NumberFormatException ex) {
142:                    }
143:                    ;
144:                }
145:                String v1s = "", v2s = "";
146:
147:                if (Integer.class.isInstance(v1)) {
148:                    v1s = ((Integer) v1).toString();
149:                } else {
150:                    v1s = (String) v1;
151:                }
152:
153:                if (Integer.class.isInstance(v2)) {
154:                    v2s = ((Integer) v2).toString();
155:                } else {
156:                    v2s = (String) v2;
157:                }
158:
159:                int res = v1s.compareTo(v2s);
160:                switch (((Integer) compare).intValue()) {
161:                case LESS_EQUAL:
162:                    return (res <= 0);
163:
164:                case LESS_THAN:
165:                    return (res < 0);
166:
167:                case EQUAL:
168:                    return (res == 0);
169:
170:                case GREATER_THAN:
171:                    return (res > 0);
172:
173:                case GREATER_EQUAL:
174:                    return (res >= 0);
175:
176:                case NOT_EQUAL:
177:                    return (res != 0);
178:                }
179:                return true;
180:            }
181:
182:            protected ValidWhenParser(TokenBuffer tokenBuf, int k) {
183:                super (tokenBuf, k);
184:                tokenNames = _tokenNames;
185:            }
186:
187:            public ValidWhenParser(TokenBuffer tokenBuf) {
188:                this (tokenBuf, 6);
189:            }
190:
191:            protected ValidWhenParser(TokenStream lexer, int k) {
192:                super (lexer, k);
193:                tokenNames = _tokenNames;
194:            }
195:
196:            public ValidWhenParser(TokenStream lexer) {
197:                this (lexer, 6);
198:            }
199:
200:            public ValidWhenParser(ParserSharedInputState state) {
201:                super (state, 6);
202:                tokenNames = _tokenNames;
203:            }
204:
205:            public final void integer() throws RecognitionException,
206:                    TokenStreamException {
207:
208:                Token d = null;
209:                Token h = null;
210:                Token o = null;
211:
212:                switch (LA(1)) {
213:                case DECIMAL_LITERAL: {
214:                    d = LT(1);
215:                    match(DECIMAL_LITERAL);
216:                    argStack.push(Integer.decode(d.getText()));
217:                    break;
218:                }
219:                case HEX_LITERAL: {
220:                    h = LT(1);
221:                    match(HEX_LITERAL);
222:                    argStack.push(Integer.decode(h.getText()));
223:                    break;
224:                }
225:                case OCTAL_LITERAL: {
226:                    o = LT(1);
227:                    match(OCTAL_LITERAL);
228:                    argStack.push(Integer.decode(o.getText()));
229:                    break;
230:                }
231:                default: {
232:                    throw new NoViableAltException(LT(1), getFilename());
233:                }
234:                }
235:            }
236:
237:            public final void string() throws RecognitionException,
238:                    TokenStreamException {
239:
240:                Token str = null;
241:
242:                str = LT(1);
243:                match(STRING_LITERAL);
244:                argStack.push(str.getText().substring(1,
245:                        str.getText().length() - 1));
246:            }
247:
248:            public final void identifier() throws RecognitionException,
249:                    TokenStreamException {
250:
251:                Token str = null;
252:
253:                str = LT(1);
254:                match(IDENTIFIER);
255:                argStack.push(str.getText());
256:            }
257:
258:            public final void field() throws RecognitionException,
259:                    TokenStreamException {
260:
261:                if ((LA(1) == IDENTIFIER) && (LA(2) == LBRACKET)
262:                        && (LA(3) == RBRACKET) && (LA(4) == IDENTIFIER)) {
263:                    identifier();
264:                    match(LBRACKET);
265:                    match(RBRACKET);
266:                    identifier();
267:
268:                    Object i2 = argStack.pop();
269:                    Object i1 = argStack.pop();
270:                    argStack.push(ValidatorUtils.getValueAsString(form, i1
271:                            + "[" + index + "]" + i2));
272:
273:                } else if ((LA(1) == IDENTIFIER)
274:                        && (LA(2) == LBRACKET)
275:                        && ((LA(3) >= DECIMAL_LITERAL && LA(3) <= OCTAL_LITERAL))
276:                        && (LA(4) == RBRACKET) && (LA(5) == IDENTIFIER)) {
277:                    identifier();
278:                    match(LBRACKET);
279:                    integer();
280:                    match(RBRACKET);
281:                    identifier();
282:
283:                    Object i5 = argStack.pop();
284:                    Object i4 = argStack.pop();
285:                    Object i3 = argStack.pop();
286:                    argStack.push(ValidatorUtils.getValueAsString(form, i3
287:                            + "[" + i4 + "]" + i5));
288:
289:                } else if ((LA(1) == IDENTIFIER)
290:                        && (LA(2) == LBRACKET)
291:                        && ((LA(3) >= DECIMAL_LITERAL && LA(3) <= OCTAL_LITERAL))
292:                        && (LA(4) == RBRACKET) && (LA(5) == LBRACKET)) {
293:                    identifier();
294:                    match(LBRACKET);
295:                    integer();
296:                    match(RBRACKET);
297:                    match(LBRACKET);
298:
299:                    Object i7 = argStack.pop();
300:                    Object i6 = argStack.pop();
301:                    argStack.push(ValidatorUtils.getValueAsString(form, i6
302:                            + "[" + i7 + "]"));
303:
304:                } else if ((LA(1) == IDENTIFIER) && (LA(2) == LBRACKET)
305:                        && (LA(3) == RBRACKET) && (_tokenSet_0.member(LA(4)))) {
306:                    identifier();
307:                    match(LBRACKET);
308:                    match(RBRACKET);
309:
310:                    Object i8 = argStack.pop();
311:                    argStack.push(ValidatorUtils.getValueAsString(form, i8
312:                            + "[" + index + "]"));
313:
314:                } else if ((LA(1) == IDENTIFIER) && (_tokenSet_0.member(LA(2)))) {
315:                    identifier();
316:
317:                    Object i9 = argStack.pop();
318:                    argStack.push(ValidatorUtils.getValueAsString(form,
319:                            (String) i9));
320:
321:                } else {
322:                    throw new NoViableAltException(LT(1), getFilename());
323:                }
324:
325:            }
326:
327:            public final void literal() throws RecognitionException,
328:                    TokenStreamException {
329:
330:                switch (LA(1)) {
331:                case DECIMAL_LITERAL:
332:                case HEX_LITERAL:
333:                case OCTAL_LITERAL: {
334:                    integer();
335:                    break;
336:                }
337:                case STRING_LITERAL: {
338:                    string();
339:                    break;
340:                }
341:                case LITERAL_null: {
342:                    match(LITERAL_null);
343:                    argStack.push(null);
344:                    break;
345:                }
346:                case THIS: {
347:                    match(THIS);
348:                    argStack.push(value);
349:                    break;
350:                }
351:                default: {
352:                    throw new NoViableAltException(LT(1), getFilename());
353:                }
354:                }
355:            }
356:
357:            public final void value() throws RecognitionException,
358:                    TokenStreamException {
359:
360:                switch (LA(1)) {
361:                case IDENTIFIER: {
362:                    field();
363:                    break;
364:                }
365:                case DECIMAL_LITERAL:
366:                case HEX_LITERAL:
367:                case OCTAL_LITERAL:
368:                case STRING_LITERAL:
369:                case LITERAL_null:
370:                case THIS: {
371:                    literal();
372:                    break;
373:                }
374:                default: {
375:                    throw new NoViableAltException(LT(1), getFilename());
376:                }
377:                }
378:            }
379:
380:            public final void expression() throws RecognitionException,
381:                    TokenStreamException {
382:
383:                expr();
384:                match(Token.EOF_TYPE);
385:            }
386:
387:            public final void expr() throws RecognitionException,
388:                    TokenStreamException {
389:
390:                if ((LA(1) == LPAREN) && (_tokenSet_1.member(LA(2)))) {
391:                    match(LPAREN);
392:                    comparisonExpression();
393:                    match(RPAREN);
394:                } else if ((LA(1) == LPAREN) && (LA(2) == LPAREN)) {
395:                    match(LPAREN);
396:                    joinedExpression();
397:                    match(RPAREN);
398:                } else {
399:                    throw new NoViableAltException(LT(1), getFilename());
400:                }
401:
402:            }
403:
404:            public final void comparisonExpression()
405:                    throws RecognitionException, TokenStreamException {
406:
407:                value();
408:                comparison();
409:                value();
410:
411:                Object v2 = argStack.pop();
412:                Object comp = argStack.pop();
413:                Object v1 = argStack.pop();
414:                argStack.push(new Boolean(evaluateComparison(v1, comp, v2)));
415:
416:            }
417:
418:            public final void joinedExpression() throws RecognitionException,
419:                    TokenStreamException {
420:
421:                expr();
422:                join();
423:                expr();
424:
425:                Boolean v1 = (Boolean) argStack.pop();
426:                Integer join = (Integer) argStack.pop();
427:                Boolean v2 = (Boolean) argStack.pop();
428:                if (join.intValue() == AND) {
429:                    argStack.push(new Boolean(v1.booleanValue()
430:                            && v2.booleanValue()));
431:                } else {
432:                    argStack.push(new Boolean(v1.booleanValue()
433:                            || v2.booleanValue()));
434:                }
435:
436:            }
437:
438:            public final void join() throws RecognitionException,
439:                    TokenStreamException {
440:
441:                switch (LA(1)) {
442:                case ANDSIGN: {
443:                    match(ANDSIGN);
444:                    argStack.push(new Integer(AND));
445:                    break;
446:                }
447:                case ORSIGN: {
448:                    match(ORSIGN);
449:                    argStack.push(new Integer(OR));
450:                    break;
451:                }
452:                default: {
453:                    throw new NoViableAltException(LT(1), getFilename());
454:                }
455:                }
456:            }
457:
458:            public final void comparison() throws RecognitionException,
459:                    TokenStreamException {
460:
461:                switch (LA(1)) {
462:                case EQUALSIGN: {
463:                    match(EQUALSIGN);
464:                    argStack.push(new Integer(EQUAL));
465:                    break;
466:                }
467:                case GREATERTHANSIGN: {
468:                    match(GREATERTHANSIGN);
469:                    argStack.push(new Integer(GREATER_THAN));
470:                    break;
471:                }
472:                case GREATEREQUALSIGN: {
473:                    match(GREATEREQUALSIGN);
474:                    argStack.push(new Integer(GREATER_EQUAL));
475:                    break;
476:                }
477:                case LESSTHANSIGN: {
478:                    match(LESSTHANSIGN);
479:                    argStack.push(new Integer(LESS_THAN));
480:                    break;
481:                }
482:                case LESSEQUALSIGN: {
483:                    match(LESSEQUALSIGN);
484:                    argStack.push(new Integer(LESS_EQUAL));
485:                    break;
486:                }
487:                case NOTEQUALSIGN: {
488:                    match(NOTEQUALSIGN);
489:                    argStack.push(new Integer(NOT_EQUAL));
490:                    break;
491:                }
492:                default: {
493:                    throw new NoViableAltException(LT(1), getFilename());
494:                }
495:                }
496:            }
497:
498:            public static final String[] _tokenNames = { "<0>", "EOF", "<2>",
499:                    "NULL_TREE_LOOKAHEAD", "DECIMAL_LITERAL", "HEX_LITERAL",
500:                    "OCTAL_LITERAL", "STRING_LITERAL", "IDENTIFIER",
501:                    "LBRACKET", "RBRACKET", "\"null\"", "THIS", "LPAREN",
502:                    "RPAREN", "\"and\"", "\"or\"", "EQUALSIGN",
503:                    "GREATERTHANSIGN", "GREATEREQUALSIGN", "LESSTHANSIGN",
504:                    "LESSEQUALSIGN", "NOTEQUALSIGN", "WS" };
505:
506:            private static final long[] mk_tokenSet_0() {
507:                long[] data = { 8273920L, 0L };
508:                return data;
509:            }
510:
511:            public static final BitSet _tokenSet_0 = new BitSet(mk_tokenSet_0());
512:
513:            private static final long[] mk_tokenSet_1() {
514:                long[] data = { 6640L, 0L };
515:                return data;
516:            }
517:
518:            public static final BitSet _tokenSet_1 = new BitSet(mk_tokenSet_1());
519:
520:        }
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