Source Code Cross Referenced for JavaCharStream.java in  » RSS-RDF » sesame » org » openrdf » query » parser » sparql » ast » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » RSS RDF » sesame » org.openrdf.query.parser.sparql.ast 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* Generated By:JavaCC: Do not edit this line. JavaCharStream.java Version 4.0 */
002:        package org.openrdf.query.parser.sparql.ast;
003:
004:        /**
005:         * An implementation of interface CharStream, where the stream is assumed to
006:         * contain only ASCII characters (with java-like unicode escape processing).
007:         */
008:
009:        public class JavaCharStream {
010:            public static final boolean staticFlag = false;
011:
012:            static final int hexval(char c) throws java.io.IOException {
013:                switch (c) {
014:                case '0':
015:                    return 0;
016:                case '1':
017:                    return 1;
018:                case '2':
019:                    return 2;
020:                case '3':
021:                    return 3;
022:                case '4':
023:                    return 4;
024:                case '5':
025:                    return 5;
026:                case '6':
027:                    return 6;
028:                case '7':
029:                    return 7;
030:                case '8':
031:                    return 8;
032:                case '9':
033:                    return 9;
034:
035:                case 'a':
036:                case 'A':
037:                    return 10;
038:                case 'b':
039:                case 'B':
040:                    return 11;
041:                case 'c':
042:                case 'C':
043:                    return 12;
044:                case 'd':
045:                case 'D':
046:                    return 13;
047:                case 'e':
048:                case 'E':
049:                    return 14;
050:                case 'f':
051:                case 'F':
052:                    return 15;
053:                }
054:
055:                throw new java.io.IOException(); // Should never come here
056:            }
057:
058:            public int bufpos = -1;
059:            int bufsize;
060:            int available;
061:            int tokenBegin;
062:            protected int bufline[];
063:            protected int bufcolumn[];
064:
065:            protected int column = 0;
066:            protected int line = 1;
067:
068:            protected boolean prevCharIsCR = false;
069:            protected boolean prevCharIsLF = false;
070:
071:            protected java.io.Reader inputStream;
072:
073:            protected char[] nextCharBuf;
074:            protected char[] buffer;
075:            protected int maxNextCharInd = 0;
076:            protected int nextCharInd = -1;
077:            protected int inBuf = 0;
078:            protected int tabSize = 8;
079:
080:            protected void setTabSize(int i) {
081:                tabSize = i;
082:            }
083:
084:            protected int getTabSize(int i) {
085:                return tabSize;
086:            }
087:
088:            protected void ExpandBuff(boolean wrapAround) {
089:                char[] newbuffer = new char[bufsize + 2048];
090:                int newbufline[] = new int[bufsize + 2048];
091:                int newbufcolumn[] = new int[bufsize + 2048];
092:
093:                try {
094:                    if (wrapAround) {
095:                        System.arraycopy(buffer, tokenBegin, newbuffer, 0,
096:                                bufsize - tokenBegin);
097:                        System.arraycopy(buffer, 0, newbuffer, bufsize
098:                                - tokenBegin, bufpos);
099:                        buffer = newbuffer;
100:
101:                        System.arraycopy(bufline, tokenBegin, newbufline, 0,
102:                                bufsize - tokenBegin);
103:                        System.arraycopy(bufline, 0, newbufline, bufsize
104:                                - tokenBegin, bufpos);
105:                        bufline = newbufline;
106:
107:                        System.arraycopy(bufcolumn, tokenBegin, newbufcolumn,
108:                                0, bufsize - tokenBegin);
109:                        System.arraycopy(bufcolumn, 0, newbufcolumn, bufsize
110:                                - tokenBegin, bufpos);
111:                        bufcolumn = newbufcolumn;
112:
113:                        bufpos += (bufsize - tokenBegin);
114:                    } else {
115:                        System.arraycopy(buffer, tokenBegin, newbuffer, 0,
116:                                bufsize - tokenBegin);
117:                        buffer = newbuffer;
118:
119:                        System.arraycopy(bufline, tokenBegin, newbufline, 0,
120:                                bufsize - tokenBegin);
121:                        bufline = newbufline;
122:
123:                        System.arraycopy(bufcolumn, tokenBegin, newbufcolumn,
124:                                0, bufsize - tokenBegin);
125:                        bufcolumn = newbufcolumn;
126:
127:                        bufpos -= tokenBegin;
128:                    }
129:                } catch (Throwable t) {
130:                    throw new Error(t.getMessage());
131:                }
132:
133:                available = (bufsize += 2048);
134:                tokenBegin = 0;
135:            }
136:
137:            protected void FillBuff() throws java.io.IOException {
138:                int i;
139:                if (maxNextCharInd == 4096)
140:                    maxNextCharInd = nextCharInd = 0;
141:
142:                try {
143:                    if ((i = inputStream.read(nextCharBuf, maxNextCharInd,
144:                            4096 - maxNextCharInd)) == -1) {
145:                        inputStream.close();
146:                        throw new java.io.IOException();
147:                    } else
148:                        maxNextCharInd += i;
149:                    return;
150:                } catch (java.io.IOException e) {
151:                    if (bufpos != 0) {
152:                        --bufpos;
153:                        backup(0);
154:                    } else {
155:                        bufline[bufpos] = line;
156:                        bufcolumn[bufpos] = column;
157:                    }
158:                    throw e;
159:                }
160:            }
161:
162:            protected char ReadByte() throws java.io.IOException {
163:                if (++nextCharInd >= maxNextCharInd)
164:                    FillBuff();
165:
166:                return nextCharBuf[nextCharInd];
167:            }
168:
169:            public char BeginToken() throws java.io.IOException {
170:                if (inBuf > 0) {
171:                    --inBuf;
172:
173:                    if (++bufpos == bufsize)
174:                        bufpos = 0;
175:
176:                    tokenBegin = bufpos;
177:                    return buffer[bufpos];
178:                }
179:
180:                tokenBegin = 0;
181:                bufpos = -1;
182:
183:                return readChar();
184:            }
185:
186:            protected void AdjustBuffSize() {
187:                if (available == bufsize) {
188:                    if (tokenBegin > 2048) {
189:                        bufpos = 0;
190:                        available = tokenBegin;
191:                    } else
192:                        ExpandBuff(false);
193:                } else if (available > tokenBegin)
194:                    available = bufsize;
195:                else if ((tokenBegin - available) < 2048)
196:                    ExpandBuff(true);
197:                else
198:                    available = tokenBegin;
199:            }
200:
201:            protected void UpdateLineColumn(char c) {
202:                column++;
203:
204:                if (prevCharIsLF) {
205:                    prevCharIsLF = false;
206:                    line += (column = 1);
207:                } else if (prevCharIsCR) {
208:                    prevCharIsCR = false;
209:                    if (c == '\n') {
210:                        prevCharIsLF = true;
211:                    } else
212:                        line += (column = 1);
213:                }
214:
215:                switch (c) {
216:                case '\r':
217:                    prevCharIsCR = true;
218:                    break;
219:                case '\n':
220:                    prevCharIsLF = true;
221:                    break;
222:                case '\t':
223:                    column--;
224:                    column += (tabSize - (column % tabSize));
225:                    break;
226:                default:
227:                    break;
228:                }
229:
230:                bufline[bufpos] = line;
231:                bufcolumn[bufpos] = column;
232:            }
233:
234:            public char readChar() throws java.io.IOException {
235:                if (inBuf > 0) {
236:                    --inBuf;
237:
238:                    if (++bufpos == bufsize)
239:                        bufpos = 0;
240:
241:                    return buffer[bufpos];
242:                }
243:
244:                char c;
245:
246:                if (++bufpos == available)
247:                    AdjustBuffSize();
248:
249:                if ((buffer[bufpos] = c = ReadByte()) == '\\') {
250:                    UpdateLineColumn(c);
251:
252:                    int backSlashCnt = 1;
253:
254:                    for (;;) // Read all the backslashes
255:                    {
256:                        if (++bufpos == available)
257:                            AdjustBuffSize();
258:
259:                        try {
260:                            if ((buffer[bufpos] = c = ReadByte()) != '\\') {
261:                                UpdateLineColumn(c);
262:                                // found a non-backslash char.
263:                                if ((c == 'u') && ((backSlashCnt & 1) == 1)) {
264:                                    if (--bufpos < 0)
265:                                        bufpos = bufsize - 1;
266:
267:                                    break;
268:                                }
269:
270:                                backup(backSlashCnt);
271:                                return '\\';
272:                            }
273:                        } catch (java.io.IOException e) {
274:                            if (backSlashCnt > 1)
275:                                backup(backSlashCnt);
276:
277:                            return '\\';
278:                        }
279:
280:                        UpdateLineColumn(c);
281:                        backSlashCnt++;
282:                    }
283:
284:                    // Here, we have seen an odd number of backslash's followed by a 'u'
285:                    try {
286:                        while ((c = ReadByte()) == 'u')
287:                            ++column;
288:
289:                        buffer[bufpos] = c = (char) (hexval(c) << 12
290:                                | hexval(ReadByte()) << 8
291:                                | hexval(ReadByte()) << 4 | hexval(ReadByte()));
292:
293:                        column += 4;
294:                    } catch (java.io.IOException e) {
295:                        throw new Error("Invalid escape character at line "
296:                                + line + " column " + column + ".");
297:                    }
298:
299:                    if (backSlashCnt == 1)
300:                        return c;
301:                    else {
302:                        backup(backSlashCnt - 1);
303:                        return '\\';
304:                    }
305:                } else {
306:                    UpdateLineColumn(c);
307:                    return (c);
308:                }
309:            }
310:
311:            /**
312:             * @deprecated 
313:             * @see #getEndColumn
314:             */
315:
316:            public int getColumn() {
317:                return bufcolumn[bufpos];
318:            }
319:
320:            /**
321:             * @deprecated 
322:             * @see #getEndLine
323:             */
324:
325:            public int getLine() {
326:                return bufline[bufpos];
327:            }
328:
329:            public int getEndColumn() {
330:                return bufcolumn[bufpos];
331:            }
332:
333:            public int getEndLine() {
334:                return bufline[bufpos];
335:            }
336:
337:            public int getBeginColumn() {
338:                return bufcolumn[tokenBegin];
339:            }
340:
341:            public int getBeginLine() {
342:                return bufline[tokenBegin];
343:            }
344:
345:            public void backup(int amount) {
346:
347:                inBuf += amount;
348:                if ((bufpos -= amount) < 0)
349:                    bufpos += bufsize;
350:            }
351:
352:            public JavaCharStream(java.io.Reader dstream, int startline,
353:                    int startcolumn, int buffersize) {
354:                inputStream = dstream;
355:                line = startline;
356:                column = startcolumn - 1;
357:
358:                available = bufsize = buffersize;
359:                buffer = new char[buffersize];
360:                bufline = new int[buffersize];
361:                bufcolumn = new int[buffersize];
362:                nextCharBuf = new char[4096];
363:            }
364:
365:            public JavaCharStream(java.io.Reader dstream, int startline,
366:                    int startcolumn) {
367:                this (dstream, startline, startcolumn, 4096);
368:            }
369:
370:            public JavaCharStream(java.io.Reader dstream) {
371:                this (dstream, 1, 1, 4096);
372:            }
373:
374:            public void ReInit(java.io.Reader dstream, int startline,
375:                    int startcolumn, int buffersize) {
376:                inputStream = dstream;
377:                line = startline;
378:                column = startcolumn - 1;
379:
380:                if (buffer == null || buffersize != buffer.length) {
381:                    available = bufsize = buffersize;
382:                    buffer = new char[buffersize];
383:                    bufline = new int[buffersize];
384:                    bufcolumn = new int[buffersize];
385:                    nextCharBuf = new char[4096];
386:                }
387:                prevCharIsLF = prevCharIsCR = false;
388:                tokenBegin = inBuf = maxNextCharInd = 0;
389:                nextCharInd = bufpos = -1;
390:            }
391:
392:            public void ReInit(java.io.Reader dstream, int startline,
393:                    int startcolumn) {
394:                ReInit(dstream, startline, startcolumn, 4096);
395:            }
396:
397:            public void ReInit(java.io.Reader dstream) {
398:                ReInit(dstream, 1, 1, 4096);
399:            }
400:
401:            public JavaCharStream(java.io.InputStream dstream, String encoding,
402:                    int startline, int startcolumn, int buffersize)
403:                    throws java.io.UnsupportedEncodingException {
404:                this (encoding == null ? new java.io.InputStreamReader(dstream)
405:                        : new java.io.InputStreamReader(dstream, encoding),
406:                        startline, startcolumn, buffersize);
407:            }
408:
409:            public JavaCharStream(java.io.InputStream dstream, int startline,
410:                    int startcolumn, int buffersize) {
411:                this (new java.io.InputStreamReader(dstream), startline,
412:                        startcolumn, 4096);
413:            }
414:
415:            public JavaCharStream(java.io.InputStream dstream, String encoding,
416:                    int startline, int startcolumn)
417:                    throws java.io.UnsupportedEncodingException {
418:                this (dstream, encoding, startline, startcolumn, 4096);
419:            }
420:
421:            public JavaCharStream(java.io.InputStream dstream, int startline,
422:                    int startcolumn) {
423:                this (dstream, startline, startcolumn, 4096);
424:            }
425:
426:            public JavaCharStream(java.io.InputStream dstream, String encoding)
427:                    throws java.io.UnsupportedEncodingException {
428:                this (dstream, encoding, 1, 1, 4096);
429:            }
430:
431:            public JavaCharStream(java.io.InputStream dstream) {
432:                this (dstream, 1, 1, 4096);
433:            }
434:
435:            public void ReInit(java.io.InputStream dstream, String encoding,
436:                    int startline, int startcolumn, int buffersize)
437:                    throws java.io.UnsupportedEncodingException {
438:                ReInit(
439:                        encoding == null ? new java.io.InputStreamReader(
440:                                dstream) : new java.io.InputStreamReader(
441:                                dstream, encoding), startline, startcolumn,
442:                        buffersize);
443:            }
444:
445:            public void ReInit(java.io.InputStream dstream, int startline,
446:                    int startcolumn, int buffersize) {
447:                ReInit(new java.io.InputStreamReader(dstream), startline,
448:                        startcolumn, buffersize);
449:            }
450:
451:            public void ReInit(java.io.InputStream dstream, String encoding,
452:                    int startline, int startcolumn)
453:                    throws java.io.UnsupportedEncodingException {
454:                ReInit(dstream, encoding, startline, startcolumn, 4096);
455:            }
456:
457:            public void ReInit(java.io.InputStream dstream, int startline,
458:                    int startcolumn) {
459:                ReInit(dstream, startline, startcolumn, 4096);
460:            }
461:
462:            public void ReInit(java.io.InputStream dstream, String encoding)
463:                    throws java.io.UnsupportedEncodingException {
464:                ReInit(dstream, encoding, 1, 1, 4096);
465:            }
466:
467:            public void ReInit(java.io.InputStream dstream) {
468:                ReInit(dstream, 1, 1, 4096);
469:            }
470:
471:            public String GetImage() {
472:                if (bufpos >= tokenBegin)
473:                    return new String(buffer, tokenBegin, bufpos - tokenBegin
474:                            + 1);
475:                else
476:                    return new String(buffer, tokenBegin, bufsize - tokenBegin)
477:                            + new String(buffer, 0, bufpos + 1);
478:            }
479:
480:            public char[] GetSuffix(int len) {
481:                char[] ret = new char[len];
482:
483:                if ((bufpos + 1) >= len)
484:                    System.arraycopy(buffer, bufpos - len + 1, ret, 0, len);
485:                else {
486:                    System.arraycopy(buffer, bufsize - (len - bufpos - 1), ret,
487:                            0, len - bufpos - 1);
488:                    System.arraycopy(buffer, 0, ret, len - bufpos - 1,
489:                            bufpos + 1);
490:                }
491:
492:                return ret;
493:            }
494:
495:            public void Done() {
496:                nextCharBuf = null;
497:                buffer = null;
498:                bufline = null;
499:                bufcolumn = null;
500:            }
501:
502:            /**
503:             * Method to adjust line and column numbers for the start of a token.
504:             */
505:            public void adjustBeginLineColumn(int newLine, int newCol) {
506:                int start = tokenBegin;
507:                int len;
508:
509:                if (bufpos >= tokenBegin) {
510:                    len = bufpos - tokenBegin + inBuf + 1;
511:                } else {
512:                    len = bufsize - tokenBegin + bufpos + 1 + inBuf;
513:                }
514:
515:                int i = 0, j = 0, k = 0;
516:                int nextColDiff = 0, columnDiff = 0;
517:
518:                while (i < len
519:                        && bufline[j = start % bufsize] == bufline[k = ++start
520:                                % bufsize]) {
521:                    bufline[j] = newLine;
522:                    nextColDiff = columnDiff + bufcolumn[k] - bufcolumn[j];
523:                    bufcolumn[j] = newCol + columnDiff;
524:                    columnDiff = nextColDiff;
525:                    i++;
526:                }
527:
528:                if (i < len) {
529:                    bufline[j] = newLine++;
530:                    bufcolumn[j] = newCol + columnDiff;
531:
532:                    while (i++ < len) {
533:                        if (bufline[j = start % bufsize] != bufline[++start
534:                                % bufsize])
535:                            bufline[j] = newLine++;
536:                        else
537:                            bufline[j] = newLine;
538:                    }
539:                }
540:
541:                line = bufline[j];
542:                column = bufcolumn[j];
543:            }
544:
545:        }
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