Source Code Cross Referenced for Lex.java in  » Byte-Code » Javassist » javassist » compiler » Java Source Code / Java DocumentationJava Source Code and Java Documentation

Java Source Code / Java Documentation
1. 6.0 JDK Core
2. 6.0 JDK Modules
3. 6.0 JDK Modules com.sun
4. 6.0 JDK Modules com.sun.java
5. 6.0 JDK Modules sun
6. 6.0 JDK Platform
7. Ajax
8. Apache Harmony Java SE
9. Aspect oriented
10. Authentication Authorization
11. Blogger System
12. Build
13. Byte Code
14. Cache
15. Chart
16. Chat
17. Code Analyzer
18. Collaboration
19. Content Management System
20. Database Client
21. Database DBMS
22. Database JDBC Connection Pool
23. Database ORM
24. Development
25. EJB Server geronimo
26. EJB Server GlassFish
27. EJB Server JBoss 4.2.1
28. EJB Server resin 3.1.5
29. ERP CRM Financial
30. ESB
31. Forum
32. GIS
33. Graphic Library
34. Groupware
35. HTML Parser
36. IDE
37. IDE Eclipse
38. IDE Netbeans
39. Installer
40. Internationalization Localization
41. Inversion of Control
42. Issue Tracking
43. J2EE
44. JBoss
45. JMS
46. JMX
47. Library
48. Mail Clients
49. Net
50. Parser
51. PDF
52. Portal
53. Profiler
54. Project Management
55. Report
56. RSS RDF
57. Rule Engine
58. Science
59. Scripting
60. Search Engine
61. Security
62. Sevlet Container
63. Source Control
64. Swing Library
65. Template Engine
66. Test Coverage
67. Testing
68. UML
69. Web Crawler
70. Web Framework
71. Web Mail
72. Web Server
73. Web Services
74. Web Services apache cxf 2.0.1
75. Web Services AXIS2
76. Wiki Engine
77. Workflow Engines
78. XML
79. XML UI
Java
Java Tutorial
Java Open Source
Jar File Download
Java Articles
Java Products
Java by API
Photoshop Tutorials
Maya Tutorials
Flash Tutorials
3ds-Max Tutorials
Illustrator Tutorials
GIMP Tutorials
C# / C Sharp
C# / CSharp Tutorial
C# / CSharp Open Source
ASP.Net
ASP.NET Tutorial
JavaScript DHTML
JavaScript Tutorial
JavaScript Reference
HTML / CSS
HTML CSS Reference
C / ANSI-C
C Tutorial
C++
C++ Tutorial
Ruby
PHP
Python
Python Tutorial
Python Open Source
SQL Server / T-SQL
SQL Server / T-SQL Tutorial
Oracle PL / SQL
Oracle PL/SQL Tutorial
PostgreSQL
SQL / MySQL
MySQL Tutorial
VB.Net
VB.Net Tutorial
Flash / Flex / ActionScript
VBA / Excel / Access / Word
XML
XML Tutorial
Microsoft Office PowerPoint 2007 Tutorial
Microsoft Office Excel 2007 Tutorial
Microsoft Office Word 2007 Tutorial
Java Source Code / Java Documentation » Byte Code » Javassist » javassist.compiler 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Javassist, a Java-bytecode translator toolkit.
003:         * Copyright (C) 1999-2006 Shigeru Chiba. All Rights Reserved.
004:         *
005:         * The contents of this file are subject to the Mozilla Public License Version
006:         * 1.1 (the "License"); you may not use this file except in compliance with
007:         * the License.  Alternatively, the contents of this file may be used under
008:         * the terms of the GNU Lesser General Public License Version 2.1 or later.
009:         *
010:         * Software distributed under the License is distributed on an "AS IS" basis,
011:         * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
012:         * for the specific language governing rights and limitations under the
013:         * License.
014:         */
015:
016:        package javassist.compiler;
017:
018:        class Token {
019:            public Token next = null;
020:            public int tokenId;
021:
022:            public long longValue;
023:            public double doubleValue;
024:            public String textValue;
025:        }
026:
027:        public class Lex implements  TokenId {
028:            private int lastChar;
029:            private StringBuffer textBuffer;
030:            private Token currentToken;
031:            private Token lookAheadTokens;
032:
033:            private String input;
034:            private int position, maxlen, lineNumber;
035:
036:            /**
037:             * Constructs a lexical analyzer.
038:             */
039:            public Lex(String s) {
040:                lastChar = -1;
041:                textBuffer = new StringBuffer();
042:                currentToken = new Token();
043:                lookAheadTokens = null;
044:
045:                input = s;
046:                position = 0;
047:                maxlen = s.length();
048:                lineNumber = 0;
049:            }
050:
051:            public int get() {
052:                if (lookAheadTokens == null)
053:                    return get(currentToken);
054:                else {
055:                    Token t;
056:                    currentToken = t = lookAheadTokens;
057:                    lookAheadTokens = lookAheadTokens.next;
058:                    return t.tokenId;
059:                }
060:            }
061:
062:            /**
063:             * Looks at the next token.
064:             */
065:            public int lookAhead() {
066:                return lookAhead(0);
067:            }
068:
069:            public int lookAhead(int i) {
070:                Token tk = lookAheadTokens;
071:                if (tk == null) {
072:                    lookAheadTokens = tk = currentToken; // reuse an object!
073:                    tk.next = null;
074:                    get(tk);
075:                }
076:
077:                for (; i-- > 0; tk = tk.next)
078:                    if (tk.next == null) {
079:                        Token tk2;
080:                        tk.next = tk2 = new Token();
081:                        get(tk2);
082:                    }
083:
084:                currentToken = tk;
085:                return tk.tokenId;
086:            }
087:
088:            public String getString() {
089:                return currentToken.textValue;
090:            }
091:
092:            public long getLong() {
093:                return currentToken.longValue;
094:            }
095:
096:            public double getDouble() {
097:                return currentToken.doubleValue;
098:            }
099:
100:            private int get(Token token) {
101:                int t;
102:                do {
103:                    t = readLine(token);
104:                } while (t == '\n');
105:                token.tokenId = t;
106:                return t;
107:            }
108:
109:            private int readLine(Token token) {
110:                int c = getNextNonWhiteChar();
111:                if (c < 0)
112:                    return c;
113:                else if (c == '\n') {
114:                    ++lineNumber;
115:                    return '\n';
116:                } else if (c == '\'')
117:                    return readCharConst(token);
118:                else if (c == '"')
119:                    return readStringL(token);
120:                else if ('0' <= c && c <= '9')
121:                    return readNumber(c, token);
122:                else if (c == '.') {
123:                    c = getc();
124:                    if ('0' <= c && c <= '9') {
125:                        StringBuffer tbuf = textBuffer;
126:                        tbuf.setLength(0);
127:                        tbuf.append('.');
128:                        return readDouble(tbuf, c, token);
129:                    } else {
130:                        ungetc(c);
131:                        return readSeparator('.');
132:                    }
133:                } else if (Character.isJavaIdentifierStart((char) c))
134:                    return readIdentifier(c, token);
135:                else
136:                    return readSeparator(c);
137:            }
138:
139:            private int getNextNonWhiteChar() {
140:                int c;
141:                do {
142:                    c = getc();
143:                    if (c == '/') {
144:                        c = getc();
145:                        if (c == '/')
146:                            do {
147:                                c = getc();
148:                            } while (c != '\n' && c != '\r' && c != -1);
149:                        else if (c == '*')
150:                            while (true) {
151:                                c = getc();
152:                                if (c == -1)
153:                                    break;
154:                                else if (c == '*')
155:                                    if ((c = getc()) == '/') {
156:                                        c = ' ';
157:                                        break;
158:                                    } else
159:                                        ungetc(c);
160:                            }
161:                        else {
162:                            ungetc(c);
163:                            c = '/';
164:                        }
165:                    }
166:                } while (isBlank(c));
167:                return c;
168:            }
169:
170:            private int readCharConst(Token token) {
171:                int c;
172:                int value = 0;
173:                while ((c = getc()) != '\'')
174:                    if (c == '\\')
175:                        value = readEscapeChar();
176:                    else if (c < 0x20) {
177:                        if (c == '\n')
178:                            ++lineNumber;
179:
180:                        return BadToken;
181:                    } else
182:                        value = c;
183:
184:                token.longValue = value;
185:                return CharConstant;
186:            }
187:
188:            private int readEscapeChar() {
189:                int c = getc();
190:                if (c == 'n')
191:                    c = '\n';
192:                else if (c == 't')
193:                    c = '\t';
194:                else if (c == 'r')
195:                    c = '\r';
196:                else if (c == 'f')
197:                    c = '\f';
198:                else if (c == '\n')
199:                    ++lineNumber;
200:
201:                return c;
202:            }
203:
204:            private int readStringL(Token token) {
205:                int c;
206:                StringBuffer tbuf = textBuffer;
207:                tbuf.setLength(0);
208:                for (;;) {
209:                    while ((c = getc()) != '"') {
210:                        if (c == '\\')
211:                            c = readEscapeChar();
212:                        else if (c == '\n' || c < 0) {
213:                            ++lineNumber;
214:                            return BadToken;
215:                        }
216:
217:                        tbuf.append((char) c);
218:                    }
219:
220:                    for (;;) {
221:                        c = getc();
222:                        if (c == '\n')
223:                            ++lineNumber;
224:                        else if (!isBlank(c))
225:                            break;
226:                    }
227:
228:                    if (c != '"') {
229:                        ungetc(c);
230:                        break;
231:                    }
232:                }
233:
234:                token.textValue = tbuf.toString();
235:                return StringL;
236:            }
237:
238:            private int readNumber(int c, Token token) {
239:                long value = 0;
240:                int c2 = getc();
241:                if (c == '0')
242:                    if (c2 == 'X' || c2 == 'x')
243:                        for (;;) {
244:                            c = getc();
245:                            if ('0' <= c && c <= '9')
246:                                value = value * 16 + (long) (c - '0');
247:                            else if ('A' <= c && c <= 'F')
248:                                value = value * 16 + (long) (c - 'A' + 10);
249:                            else if ('a' <= c && c <= 'f')
250:                                value = value * 16 + (long) (c - 'a' + 10);
251:                            else {
252:                                token.longValue = value;
253:                                if (c == 'L' || c == 'l')
254:                                    return LongConstant;
255:                                else {
256:                                    ungetc(c);
257:                                    return IntConstant;
258:                                }
259:                            }
260:                        }
261:                    else if ('0' <= c2 && c2 <= '7') {
262:                        value = c2 - '0';
263:                        for (;;) {
264:                            c = getc();
265:                            if ('0' <= c && c <= '7')
266:                                value = value * 8 + (long) (c - '0');
267:                            else {
268:                                token.longValue = value;
269:                                if (c == 'L' || c == 'l')
270:                                    return LongConstant;
271:                                else {
272:                                    ungetc(c);
273:                                    return IntConstant;
274:                                }
275:                            }
276:                        }
277:                    }
278:
279:                value = c - '0';
280:                while ('0' <= c2 && c2 <= '9') {
281:                    value = value * 10 + c2 - '0';
282:                    c2 = getc();
283:                }
284:
285:                token.longValue = value;
286:                if (c2 == 'F' || c2 == 'f') {
287:                    token.doubleValue = (double) value;
288:                    return FloatConstant;
289:                } else if (c2 == 'E' || c2 == 'e' || c2 == 'D' || c2 == 'd'
290:                        || c2 == '.') {
291:                    StringBuffer tbuf = textBuffer;
292:                    tbuf.setLength(0);
293:                    tbuf.append(value);
294:                    return readDouble(tbuf, c2, token);
295:                } else if (c2 == 'L' || c2 == 'l')
296:                    return LongConstant;
297:                else {
298:                    ungetc(c2);
299:                    return IntConstant;
300:                }
301:            }
302:
303:            private int readDouble(StringBuffer sbuf, int c, Token token) {
304:                if (c != 'E' && c != 'e' && c != 'D' && c != 'd') {
305:                    sbuf.append((char) c);
306:                    for (;;) {
307:                        c = getc();
308:                        if ('0' <= c && c <= '9')
309:                            sbuf.append((char) c);
310:                        else
311:                            break;
312:                    }
313:                }
314:
315:                if (c == 'E' || c == 'e') {
316:                    sbuf.append((char) c);
317:                    c = getc();
318:                    if (c == '+' || c == '-') {
319:                        sbuf.append((char) c);
320:                        c = getc();
321:                    }
322:
323:                    while ('0' <= c && c <= '9') {
324:                        sbuf.append((char) c);
325:                        c = getc();
326:                    }
327:                }
328:
329:                try {
330:                    token.doubleValue = Double.parseDouble(sbuf.toString());
331:                } catch (NumberFormatException e) {
332:                    return BadToken;
333:                }
334:
335:                if (c == 'F' || c == 'f')
336:                    return FloatConstant;
337:                else {
338:                    if (c != 'D' && c != 'd')
339:                        ungetc(c);
340:
341:                    return DoubleConstant;
342:                }
343:            }
344:
345:            // !"#$%&'(    )*+,-./0    12345678    9:;<=>?
346:            private static final int[] equalOps = { NEQ, 0, 0, 0, MOD_E, AND_E,
347:                    0, 0, 0, MUL_E, PLUS_E, 0, MINUS_E, 0, DIV_E, 0, 0, 0, 0,
348:                    0, 0, 0, 0, 0, 0, 0, 0, LE, EQ, GE, 0 };
349:
350:            private int readSeparator(int c) {
351:                int c2, c3;
352:                if ('!' <= c && c <= '?') {
353:                    int t = equalOps[c - '!'];
354:                    if (t == 0)
355:                        return c;
356:                    else {
357:                        c2 = getc();
358:                        if (c == c2)
359:                            switch (c) {
360:                            case '=':
361:                                return EQ;
362:                            case '+':
363:                                return PLUSPLUS;
364:                            case '-':
365:                                return MINUSMINUS;
366:                            case '&':
367:                                return ANDAND;
368:                            case '<':
369:                                c3 = getc();
370:                                if (c3 == '=')
371:                                    return LSHIFT_E;
372:                                else {
373:                                    ungetc(c3);
374:                                    return LSHIFT;
375:                                }
376:                            case '>':
377:                                c3 = getc();
378:                                if (c3 == '=')
379:                                    return RSHIFT_E;
380:                                else if (c3 == '>') {
381:                                    c3 = getc();
382:                                    if (c3 == '=')
383:                                        return ARSHIFT_E;
384:                                    else {
385:                                        ungetc(c3);
386:                                        return ARSHIFT;
387:                                    }
388:                                } else {
389:                                    ungetc(c3);
390:                                    return RSHIFT;
391:                                }
392:                            default:
393:                                break;
394:                            }
395:                        else if (c2 == '=')
396:                            return t;
397:                    }
398:                } else if (c == '^') {
399:                    c2 = getc();
400:                    if (c2 == '=')
401:                        return EXOR_E;
402:                } else if (c == '|') {
403:                    c2 = getc();
404:                    if (c2 == '=')
405:                        return OR_E;
406:                    else if (c2 == '|')
407:                        return OROR;
408:                } else
409:                    return c;
410:
411:                ungetc(c2);
412:                return c;
413:            }
414:
415:            private int readIdentifier(int c, Token token) {
416:                StringBuffer tbuf = textBuffer;
417:                tbuf.setLength(0);
418:
419:                do {
420:                    tbuf.append((char) c);
421:                    c = getc();
422:                } while (Character.isJavaIdentifierPart((char) c));
423:
424:                ungetc(c);
425:
426:                String name = tbuf.toString();
427:                int t = ktable.lookup(name);
428:                if (t >= 0)
429:                    return t;
430:                else {
431:                    /* tbuf.toString() is executed quickly since it does not
432:                     * need memory copy.  Using a hand-written extensible
433:                     * byte-array class instead of StringBuffer is not a good idea
434:                     * for execution speed.  Converting a byte array to a String
435:                     * object is very slow.  Using an extensible char array
436:                     * might be OK.
437:                     */
438:                    token.textValue = name;
439:                    return Identifier;
440:                }
441:            }
442:
443:            private static final KeywordTable ktable = new KeywordTable();
444:
445:            static {
446:                ktable.append("abstract", ABSTRACT);
447:                ktable.append("boolean", BOOLEAN);
448:                ktable.append("break", BREAK);
449:                ktable.append("byte", BYTE);
450:                ktable.append("case", CASE);
451:                ktable.append("catch", CATCH);
452:                ktable.append("char", CHAR);
453:                ktable.append("class", CLASS);
454:                ktable.append("const", CONST);
455:                ktable.append("continue", CONTINUE);
456:                ktable.append("default", DEFAULT);
457:                ktable.append("do", DO);
458:                ktable.append("double", DOUBLE);
459:                ktable.append("else", ELSE);
460:                ktable.append("extends", EXTENDS);
461:                ktable.append("false", FALSE);
462:                ktable.append("final", FINAL);
463:                ktable.append("finally", FINALLY);
464:                ktable.append("float", FLOAT);
465:                ktable.append("for", FOR);
466:                ktable.append("goto", GOTO);
467:                ktable.append("if", IF);
468:                ktable.append("implements", IMPLEMENTS);
469:                ktable.append("import", IMPORT);
470:                ktable.append("instanceof", INSTANCEOF);
471:                ktable.append("int", INT);
472:                ktable.append("interface", INTERFACE);
473:                ktable.append("long", LONG);
474:                ktable.append("native", NATIVE);
475:                ktable.append("new", NEW);
476:                ktable.append("null", NULL);
477:                ktable.append("package", PACKAGE);
478:                ktable.append("private", PRIVATE);
479:                ktable.append("protected", PROTECTED);
480:                ktable.append("public", PUBLIC);
481:                ktable.append("return", RETURN);
482:                ktable.append("short", SHORT);
483:                ktable.append("static", STATIC);
484:                ktable.append("strictfp", STRICT);
485:                ktable.append("super", SUPER);
486:                ktable.append("switch", SWITCH);
487:                ktable.append("synchronized", SYNCHRONIZED);
488:                ktable.append("this", THIS);
489:                ktable.append("throw", THROW);
490:                ktable.append("throws", THROWS);
491:                ktable.append("transient", TRANSIENT);
492:                ktable.append("true", TRUE);
493:                ktable.append("try", TRY);
494:                ktable.append("void", VOID);
495:                ktable.append("volatile", VOLATILE);
496:                ktable.append("while", WHILE);
497:            }
498:
499:            private static boolean isBlank(int c) {
500:                return c == ' ' || c == '\t' || c == '\f' || c == '\r'
501:                        || c == '\n';
502:            }
503:
504:            private static boolean isDigit(int c) {
505:                return '0' <= c && c <= '9';
506:            }
507:
508:            private void ungetc(int c) {
509:                lastChar = c;
510:            }
511:
512:            public String getTextAround() {
513:                int begin = position - 10;
514:                if (begin < 0)
515:                    begin = 0;
516:
517:                int end = position + 10;
518:                if (end > maxlen)
519:                    end = maxlen;
520:
521:                return input.substring(begin, end);
522:            }
523:
524:            private int getc() {
525:                if (lastChar < 0)
526:                    if (position < maxlen)
527:                        return input.charAt(position++);
528:                    else
529:                        return -1;
530:                else {
531:                    int c = lastChar;
532:                    lastChar = -1;
533:                    return c;
534:                }
535:            }
536:        }
www.java2java.com | Contact Us
Copyright 2009 - 12 Demo Source and Support. All rights reserved.
All other trademarks are property of their respective owners.