Source Code Cross Referenced for JavaCharStream.java in  » Testing » PolePosition-0.20 » com » versant » core » jdo » query » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Testing » PolePosition 0.20 » com.versant.core.jdo.query 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright (c) 1998 - 2005 Versant Corporation
003:         * All rights reserved. This program and the accompanying materials
004:         * are made available under the terms of the Eclipse Public License v1.0
005:         * which accompanies this distribution, and is available at
006:         * http://www.eclipse.org/legal/epl-v10.html
007:         *
008:         * Contributors:
009:         * Versant Corporation - initial API and implementation
010:         */
011:        /* Generated By:JavaCC: Do not edit this line. JavaCharStream.java Version 3.0 */
012:        package com.versant.core.jdo.query;
013:
014:        /**
015:         * An implementation of interface CharStream, where the stream is assumed to
016:         * contain only ASCII characters (with java-like unicode escape processing).
017:         */
018:
019:        public class JavaCharStream {
020:            public static final boolean staticFlag = false;
021:
022:            static final int hexval(char c) throws java.io.IOException {
023:                switch (c) {
024:                case '0':
025:                    return 0;
026:                case '1':
027:                    return 1;
028:                case '2':
029:                    return 2;
030:                case '3':
031:                    return 3;
032:                case '4':
033:                    return 4;
034:                case '5':
035:                    return 5;
036:                case '6':
037:                    return 6;
038:                case '7':
039:                    return 7;
040:                case '8':
041:                    return 8;
042:                case '9':
043:                    return 9;
044:
045:                case 'a':
046:                case 'A':
047:                    return 10;
048:                case 'b':
049:                case 'B':
050:                    return 11;
051:                case 'c':
052:                case 'C':
053:                    return 12;
054:                case 'd':
055:                case 'D':
056:                    return 13;
057:                case 'e':
058:                case 'E':
059:                    return 14;
060:                case 'f':
061:                case 'F':
062:                    return 15;
063:                }
064:
065:                throw new java.io.IOException(); // Should never come here
066:            }
067:
068:            public int bufpos = -1;
069:            int bufsize;
070:            int available;
071:            int tokenBegin;
072:            protected int bufline[];
073:            protected int bufcolumn[];
074:
075:            protected int column = 0;
076:            protected int line = 1;
077:
078:            protected boolean prevCharIsCR = false;
079:            protected boolean prevCharIsLF = false;
080:
081:            protected java.io.Reader inputStream;
082:
083:            protected char[] nextCharBuf;
084:            protected char[] buffer;
085:            protected int maxNextCharInd = 0;
086:            protected int nextCharInd = -1;
087:            protected int inBuf = 0;
088:
089:            protected void ExpandBuff(boolean wrapAround) {
090:                char[] newbuffer = new char[bufsize + 2048];
091:                int newbufline[] = new int[bufsize + 2048];
092:                int newbufcolumn[] = new int[bufsize + 2048];
093:
094:                try {
095:                    if (wrapAround) {
096:                        System.arraycopy(buffer, tokenBegin, newbuffer, 0,
097:                                bufsize - tokenBegin);
098:                        System.arraycopy(buffer, 0, newbuffer, bufsize
099:                                - tokenBegin, bufpos);
100:                        buffer = newbuffer;
101:
102:                        System.arraycopy(bufline, tokenBegin, newbufline, 0,
103:                                bufsize - tokenBegin);
104:                        System.arraycopy(bufline, 0, newbufline, bufsize
105:                                - tokenBegin, bufpos);
106:                        bufline = newbufline;
107:
108:                        System.arraycopy(bufcolumn, tokenBegin, newbufcolumn,
109:                                0, bufsize - tokenBegin);
110:                        System.arraycopy(bufcolumn, 0, newbufcolumn, bufsize
111:                                - tokenBegin, bufpos);
112:                        bufcolumn = newbufcolumn;
113:
114:                        bufpos += (bufsize - tokenBegin);
115:                    } else {
116:                        System.arraycopy(buffer, tokenBegin, newbuffer, 0,
117:                                bufsize - tokenBegin);
118:                        buffer = newbuffer;
119:
120:                        System.arraycopy(bufline, tokenBegin, newbufline, 0,
121:                                bufsize - tokenBegin);
122:                        bufline = newbufline;
123:
124:                        System.arraycopy(bufcolumn, tokenBegin, newbufcolumn,
125:                                0, bufsize - tokenBegin);
126:                        bufcolumn = newbufcolumn;
127:
128:                        bufpos -= tokenBegin;
129:                    }
130:                } catch (Throwable t) {
131:                    throw new Error(t.getMessage());
132:                }
133:
134:                available = (bufsize += 2048);
135:                tokenBegin = 0;
136:            }
137:
138:            protected void FillBuff() throws java.io.IOException {
139:                int i;
140:                if (maxNextCharInd == 4096)
141:                    maxNextCharInd = nextCharInd = 0;
142:
143:                try {
144:                    if ((i = inputStream.read(nextCharBuf, maxNextCharInd,
145:                            4096 - maxNextCharInd)) == -1) {
146:                        inputStream.close();
147:                        throw new java.io.IOException();
148:                    } else
149:                        maxNextCharInd += i;
150:                    return;
151:                } catch (java.io.IOException e) {
152:                    if (bufpos != 0) {
153:                        --bufpos;
154:                        backup(0);
155:                    } else {
156:                        bufline[bufpos] = line;
157:                        bufcolumn[bufpos] = column;
158:                    }
159:                    throw e;
160:                }
161:            }
162:
163:            protected char ReadByte() throws java.io.IOException {
164:                if (++nextCharInd >= maxNextCharInd)
165:                    FillBuff();
166:
167:                return nextCharBuf[nextCharInd];
168:            }
169:
170:            public char BeginToken() throws java.io.IOException {
171:                if (inBuf > 0) {
172:                    --inBuf;
173:
174:                    if (++bufpos == bufsize)
175:                        bufpos = 0;
176:
177:                    tokenBegin = bufpos;
178:                    return buffer[bufpos];
179:                }
180:
181:                tokenBegin = 0;
182:                bufpos = -1;
183:
184:                return readChar();
185:            }
186:
187:            protected void AdjustBuffSize() {
188:                if (available == bufsize) {
189:                    if (tokenBegin > 2048) {
190:                        bufpos = 0;
191:                        available = tokenBegin;
192:                    } else
193:                        ExpandBuff(false);
194:                } else if (available > tokenBegin)
195:                    available = bufsize;
196:                else if ((tokenBegin - available) < 2048)
197:                    ExpandBuff(true);
198:                else
199:                    available = tokenBegin;
200:            }
201:
202:            protected void UpdateLineColumn(char c) {
203:                column++;
204:
205:                if (prevCharIsLF) {
206:                    prevCharIsLF = false;
207:                    line += (column = 1);
208:                } else if (prevCharIsCR) {
209:                    prevCharIsCR = false;
210:                    if (c == '\n') {
211:                        prevCharIsLF = true;
212:                    } else
213:                        line += (column = 1);
214:                }
215:
216:                switch (c) {
217:                case '\r':
218:                    prevCharIsCR = true;
219:                    break;
220:                case '\n':
221:                    prevCharIsLF = true;
222:                    break;
223:                case '\t':
224:                    column--;
225:                    column += (8 - (column & 07));
226:                    break;
227:                default:
228:                    break;
229:                }
230:
231:                bufline[bufpos] = line;
232:                bufcolumn[bufpos] = column;
233:            }
234:
235:            public char readChar() throws java.io.IOException {
236:                if (inBuf > 0) {
237:                    --inBuf;
238:
239:                    if (++bufpos == bufsize)
240:                        bufpos = 0;
241:
242:                    return buffer[bufpos];
243:                }
244:
245:                char c;
246:
247:                if (++bufpos == available)
248:                    AdjustBuffSize();
249:
250:                if ((buffer[bufpos] = c = ReadByte()) == '\\') {
251:                    UpdateLineColumn(c);
252:
253:                    int backSlashCnt = 1;
254:
255:                    for (;;) // Read all the backslashes
256:                    {
257:                        if (++bufpos == available)
258:                            AdjustBuffSize();
259:
260:                        try {
261:                            if ((buffer[bufpos] = c = ReadByte()) != '\\') {
262:                                UpdateLineColumn(c);
263:                                // found a non-backslash char.
264:                                if ((c == 'u') && ((backSlashCnt & 1) == 1)) {
265:                                    if (--bufpos < 0)
266:                                        bufpos = bufsize - 1;
267:
268:                                    break;
269:                                }
270:
271:                                backup(backSlashCnt);
272:                                return '\\';
273:                            }
274:                        } catch (java.io.IOException e) {
275:                            if (backSlashCnt > 1)
276:                                backup(backSlashCnt);
277:
278:                            return '\\';
279:                        }
280:
281:                        UpdateLineColumn(c);
282:                        backSlashCnt++;
283:                    }
284:
285:                    // Here, we have seen an odd number of backslash's followed by a 'u'
286:                    try {
287:                        while ((c = ReadByte()) == 'u')
288:                            ++column;
289:
290:                        buffer[bufpos] = c = (char) (hexval(c) << 12
291:                                | hexval(ReadByte()) << 8
292:                                | hexval(ReadByte()) << 4 | hexval(ReadByte()));
293:
294:                        column += 4;
295:                    } catch (java.io.IOException e) {
296:                        throw new Error("Invalid escape character at line "
297:                                + line + " column " + column + ".");
298:                    }
299:
300:                    if (backSlashCnt == 1)
301:                        return c;
302:                    else {
303:                        backup(backSlashCnt - 1);
304:                        return '\\';
305:                    }
306:                } else {
307:                    UpdateLineColumn(c);
308:                    return (c);
309:                }
310:            }
311:
312:            /**
313:             * @deprecated 
314:             * @see #getEndColumn
315:             */
316:
317:            public int getColumn() {
318:                return bufcolumn[bufpos];
319:            }
320:
321:            /**
322:             * @deprecated 
323:             * @see #getEndLine
324:             */
325:
326:            public int getLine() {
327:                return bufline[bufpos];
328:            }
329:
330:            public int getEndColumn() {
331:                return bufcolumn[bufpos];
332:            }
333:
334:            public int getEndLine() {
335:                return bufline[bufpos];
336:            }
337:
338:            public int getBeginColumn() {
339:                return bufcolumn[tokenBegin];
340:            }
341:
342:            public int getBeginLine() {
343:                return bufline[tokenBegin];
344:            }
345:
346:            public void backup(int amount) {
347:
348:                inBuf += amount;
349:                if ((bufpos -= amount) < 0)
350:                    bufpos += bufsize;
351:            }
352:
353:            public JavaCharStream(java.io.Reader dstream, int startline,
354:                    int startcolumn, int buffersize) {
355:                inputStream = dstream;
356:                line = startline;
357:                column = startcolumn - 1;
358:
359:                available = bufsize = buffersize;
360:                buffer = new char[buffersize];
361:                bufline = new int[buffersize];
362:                bufcolumn = new int[buffersize];
363:                nextCharBuf = new char[4096];
364:            }
365:
366:            public JavaCharStream(java.io.Reader dstream, int startline,
367:                    int startcolumn) {
368:                this (dstream, startline, startcolumn, 4096);
369:            }
370:
371:            public JavaCharStream(java.io.Reader dstream) {
372:                this (dstream, 1, 1, 4096);
373:            }
374:
375:            public void ReInit(java.io.Reader dstream, int startline,
376:                    int startcolumn, int buffersize) {
377:                inputStream = dstream;
378:                line = startline;
379:                column = startcolumn - 1;
380:
381:                if (buffer == null || buffersize != buffer.length) {
382:                    available = bufsize = buffersize;
383:                    buffer = new char[buffersize];
384:                    bufline = new int[buffersize];
385:                    bufcolumn = new int[buffersize];
386:                    nextCharBuf = new char[4096];
387:                }
388:                prevCharIsLF = prevCharIsCR = false;
389:                tokenBegin = inBuf = maxNextCharInd = 0;
390:                nextCharInd = bufpos = -1;
391:            }
392:
393:            public void ReInit(java.io.Reader dstream, int startline,
394:                    int startcolumn) {
395:                ReInit(dstream, startline, startcolumn, 4096);
396:            }
397:
398:            public void ReInit(java.io.Reader dstream) {
399:                ReInit(dstream, 1, 1, 4096);
400:            }
401:
402:            public JavaCharStream(java.io.InputStream dstream, int startline,
403:                    int startcolumn, int buffersize) {
404:                this (new java.io.InputStreamReader(dstream), startline,
405:                        startcolumn, 4096);
406:            }
407:
408:            public JavaCharStream(java.io.InputStream dstream, int startline,
409:                    int startcolumn) {
410:                this (dstream, startline, startcolumn, 4096);
411:            }
412:
413:            public JavaCharStream(java.io.InputStream dstream) {
414:                this (dstream, 1, 1, 4096);
415:            }
416:
417:            public void ReInit(java.io.InputStream dstream, int startline,
418:                    int startcolumn, int buffersize) {
419:                ReInit(new java.io.InputStreamReader(dstream), startline,
420:                        startcolumn, 4096);
421:            }
422:
423:            public void ReInit(java.io.InputStream dstream, int startline,
424:                    int startcolumn) {
425:                ReInit(dstream, startline, startcolumn, 4096);
426:            }
427:
428:            public void ReInit(java.io.InputStream dstream) {
429:                ReInit(dstream, 1, 1, 4096);
430:            }
431:
432:            public String GetImage() {
433:                if (bufpos >= tokenBegin)
434:                    return new String(buffer, tokenBegin, bufpos - tokenBegin
435:                            + 1);
436:                else
437:                    return new String(buffer, tokenBegin, bufsize - tokenBegin)
438:                            + new String(buffer, 0, bufpos + 1);
439:            }
440:
441:            public char[] GetSuffix(int len) {
442:                char[] ret = new char[len];
443:
444:                if ((bufpos + 1) >= len)
445:                    System.arraycopy(buffer, bufpos - len + 1, ret, 0, len);
446:                else {
447:                    System.arraycopy(buffer, bufsize - (len - bufpos - 1), ret,
448:                            0, len - bufpos - 1);
449:                    System.arraycopy(buffer, 0, ret, len - bufpos - 1,
450:                            bufpos + 1);
451:                }
452:
453:                return ret;
454:            }
455:
456:            public void Done() {
457:                nextCharBuf = null;
458:                buffer = null;
459:                bufline = null;
460:                bufcolumn = null;
461:            }
462:
463:            /**
464:             * Method to adjust line and column numbers for the start of a token.
465:             */
466:            public void adjustBeginLineColumn(int newLine, int newCol) {
467:                int start = tokenBegin;
468:                int len;
469:
470:                if (bufpos >= tokenBegin) {
471:                    len = bufpos - tokenBegin + inBuf + 1;
472:                } else {
473:                    len = bufsize - tokenBegin + bufpos + 1 + inBuf;
474:                }
475:
476:                int i = 0, j = 0, k = 0;
477:                int nextColDiff = 0, columnDiff = 0;
478:
479:                while (i < len
480:                        && bufline[j = start % bufsize] == bufline[k = ++start
481:                                % bufsize]) {
482:                    bufline[j] = newLine;
483:                    nextColDiff = columnDiff + bufcolumn[k] - bufcolumn[j];
484:                    bufcolumn[j] = newCol + columnDiff;
485:                    columnDiff = nextColDiff;
486:                    i++;
487:                }
488:
489:                if (i < len) {
490:                    bufline[j] = newLine++;
491:                    bufcolumn[j] = newCol + columnDiff;
492:
493:                    while (i++ < len) {
494:                        if (bufline[j = start % bufsize] != bufline[++start
495:                                % bufsize])
496:                            bufline[j] = newLine++;
497:                        else
498:                            bufline[j] = newLine;
499:                    }
500:                }
501:
502:                line = bufline[j];
503:                column = bufcolumn[j];
504:            }
505:
506:        }
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