Source Code Cross Referenced for SimpleCharStream.java in  » J2EE » Pustefix » de » schlund » pfixcore » webservice » json » parser » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » Pustefix » de.schlund.pfixcore.webservice.json.parser 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* Generated By:JavaCC: Do not edit this line. SimpleCharStream.java Version 4.0 */
002:        package de.schlund.pfixcore.webservice.json.parser;
003:
004:        /**
005:         * An implementation of interface CharStream, where the stream is assumed to
006:         * contain only ASCII characters (without unicode processing).
007:         */
008:
009:        public class SimpleCharStream {
010:            public static final boolean staticFlag = false;
011:            int bufsize;
012:            int available;
013:            int tokenBegin;
014:            public int bufpos = -1;
015:            protected int bufline[];
016:            protected int bufcolumn[];
017:
018:            protected int column = 0;
019:            protected int line = 1;
020:
021:            protected boolean prevCharIsCR = false;
022:            protected boolean prevCharIsLF = false;
023:
024:            protected java.io.Reader inputStream;
025:
026:            protected char[] buffer;
027:            protected int maxNextCharInd = 0;
028:            protected int inBuf = 0;
029:            protected int tabSize = 8;
030:
031:            protected void setTabSize(int i) {
032:                tabSize = i;
033:            }
034:
035:            protected int getTabSize(int i) {
036:                return tabSize;
037:            }
038:
039:            protected void ExpandBuff(boolean wrapAround) {
040:                char[] newbuffer = new char[bufsize + 2048];
041:                int newbufline[] = new int[bufsize + 2048];
042:                int newbufcolumn[] = new int[bufsize + 2048];
043:
044:                try {
045:                    if (wrapAround) {
046:                        System.arraycopy(buffer, tokenBegin, newbuffer, 0,
047:                                bufsize - tokenBegin);
048:                        System.arraycopy(buffer, 0, newbuffer, bufsize
049:                                - tokenBegin, bufpos);
050:                        buffer = newbuffer;
051:
052:                        System.arraycopy(bufline, tokenBegin, newbufline, 0,
053:                                bufsize - tokenBegin);
054:                        System.arraycopy(bufline, 0, newbufline, bufsize
055:                                - tokenBegin, bufpos);
056:                        bufline = newbufline;
057:
058:                        System.arraycopy(bufcolumn, tokenBegin, newbufcolumn,
059:                                0, bufsize - tokenBegin);
060:                        System.arraycopy(bufcolumn, 0, newbufcolumn, bufsize
061:                                - tokenBegin, bufpos);
062:                        bufcolumn = newbufcolumn;
063:
064:                        maxNextCharInd = (bufpos += (bufsize - tokenBegin));
065:                    } else {
066:                        System.arraycopy(buffer, tokenBegin, newbuffer, 0,
067:                                bufsize - tokenBegin);
068:                        buffer = newbuffer;
069:
070:                        System.arraycopy(bufline, tokenBegin, newbufline, 0,
071:                                bufsize - tokenBegin);
072:                        bufline = newbufline;
073:
074:                        System.arraycopy(bufcolumn, tokenBegin, newbufcolumn,
075:                                0, bufsize - tokenBegin);
076:                        bufcolumn = newbufcolumn;
077:
078:                        maxNextCharInd = (bufpos -= tokenBegin);
079:                    }
080:                } catch (Throwable t) {
081:                    throw new Error(t.getMessage());
082:                }
083:
084:                bufsize += 2048;
085:                available = bufsize;
086:                tokenBegin = 0;
087:            }
088:
089:            protected void FillBuff() throws java.io.IOException {
090:                if (maxNextCharInd == available) {
091:                    if (available == bufsize) {
092:                        if (tokenBegin > 2048) {
093:                            bufpos = maxNextCharInd = 0;
094:                            available = tokenBegin;
095:                        } else if (tokenBegin < 0)
096:                            bufpos = maxNextCharInd = 0;
097:                        else
098:                            ExpandBuff(false);
099:                    } else if (available > tokenBegin)
100:                        available = bufsize;
101:                    else if ((tokenBegin - available) < 2048)
102:                        ExpandBuff(true);
103:                    else
104:                        available = tokenBegin;
105:                }
106:
107:                int i;
108:                try {
109:                    if ((i = inputStream.read(buffer, maxNextCharInd, available
110:                            - maxNextCharInd)) == -1) {
111:                        inputStream.close();
112:                        throw new java.io.IOException();
113:                    } else
114:                        maxNextCharInd += i;
115:                    return;
116:                } catch (java.io.IOException e) {
117:                    --bufpos;
118:                    backup(0);
119:                    if (tokenBegin == -1)
120:                        tokenBegin = bufpos;
121:                    throw e;
122:                }
123:            }
124:
125:            public char BeginToken() throws java.io.IOException {
126:                tokenBegin = -1;
127:                char c = readChar();
128:                tokenBegin = bufpos;
129:
130:                return c;
131:            }
132:
133:            protected void UpdateLineColumn(char c) {
134:                column++;
135:
136:                if (prevCharIsLF) {
137:                    prevCharIsLF = false;
138:                    line += (column = 1);
139:                } else if (prevCharIsCR) {
140:                    prevCharIsCR = false;
141:                    if (c == '\n') {
142:                        prevCharIsLF = true;
143:                    } else
144:                        line += (column = 1);
145:                }
146:
147:                switch (c) {
148:                case '\r':
149:                    prevCharIsCR = true;
150:                    break;
151:                case '\n':
152:                    prevCharIsLF = true;
153:                    break;
154:                case '\t':
155:                    column--;
156:                    column += (tabSize - (column % tabSize));
157:                    break;
158:                default:
159:                    break;
160:                }
161:
162:                bufline[bufpos] = line;
163:                bufcolumn[bufpos] = column;
164:            }
165:
166:            public char readChar() throws java.io.IOException {
167:                if (inBuf > 0) {
168:                    --inBuf;
169:
170:                    if (++bufpos == bufsize)
171:                        bufpos = 0;
172:
173:                    return buffer[bufpos];
174:                }
175:
176:                if (++bufpos >= maxNextCharInd)
177:                    FillBuff();
178:
179:                char c = buffer[bufpos];
180:
181:                UpdateLineColumn(c);
182:                return (c);
183:            }
184:
185:            /**
186:             * @deprecated 
187:             * @see #getEndColumn
188:             */
189:
190:            public int getColumn() {
191:                return bufcolumn[bufpos];
192:            }
193:
194:            /**
195:             * @deprecated 
196:             * @see #getEndLine
197:             */
198:
199:            public int getLine() {
200:                return bufline[bufpos];
201:            }
202:
203:            public int getEndColumn() {
204:                return bufcolumn[bufpos];
205:            }
206:
207:            public int getEndLine() {
208:                return bufline[bufpos];
209:            }
210:
211:            public int getBeginColumn() {
212:                return bufcolumn[tokenBegin];
213:            }
214:
215:            public int getBeginLine() {
216:                return bufline[tokenBegin];
217:            }
218:
219:            public void backup(int amount) {
220:
221:                inBuf += amount;
222:                if ((bufpos -= amount) < 0)
223:                    bufpos += bufsize;
224:            }
225:
226:            public SimpleCharStream(java.io.Reader dstream, int startline,
227:                    int startcolumn, int buffersize) {
228:                inputStream = dstream;
229:                line = startline;
230:                column = startcolumn - 1;
231:
232:                available = bufsize = buffersize;
233:                buffer = new char[buffersize];
234:                bufline = new int[buffersize];
235:                bufcolumn = new int[buffersize];
236:            }
237:
238:            public SimpleCharStream(java.io.Reader dstream, int startline,
239:                    int startcolumn) {
240:                this (dstream, startline, startcolumn, 4096);
241:            }
242:
243:            public SimpleCharStream(java.io.Reader dstream) {
244:                this (dstream, 1, 1, 4096);
245:            }
246:
247:            public void ReInit(java.io.Reader dstream, int startline,
248:                    int startcolumn, int buffersize) {
249:                inputStream = dstream;
250:                line = startline;
251:                column = startcolumn - 1;
252:
253:                if (buffer == null || buffersize != buffer.length) {
254:                    available = bufsize = buffersize;
255:                    buffer = new char[buffersize];
256:                    bufline = new int[buffersize];
257:                    bufcolumn = new int[buffersize];
258:                }
259:                prevCharIsLF = prevCharIsCR = false;
260:                tokenBegin = inBuf = maxNextCharInd = 0;
261:                bufpos = -1;
262:            }
263:
264:            public void ReInit(java.io.Reader dstream, int startline,
265:                    int startcolumn) {
266:                ReInit(dstream, startline, startcolumn, 4096);
267:            }
268:
269:            public void ReInit(java.io.Reader dstream) {
270:                ReInit(dstream, 1, 1, 4096);
271:            }
272:
273:            public SimpleCharStream(java.io.InputStream dstream,
274:                    String encoding, int startline, int startcolumn,
275:                    int buffersize) throws java.io.UnsupportedEncodingException {
276:                this (encoding == null ? new java.io.InputStreamReader(dstream)
277:                        : new java.io.InputStreamReader(dstream, encoding),
278:                        startline, startcolumn, buffersize);
279:            }
280:
281:            public SimpleCharStream(java.io.InputStream dstream, int startline,
282:                    int startcolumn, int buffersize) {
283:                this (new java.io.InputStreamReader(dstream), startline,
284:                        startcolumn, buffersize);
285:            }
286:
287:            public SimpleCharStream(java.io.InputStream dstream,
288:                    String encoding, int startline, int startcolumn)
289:                    throws java.io.UnsupportedEncodingException {
290:                this (dstream, encoding, startline, startcolumn, 4096);
291:            }
292:
293:            public SimpleCharStream(java.io.InputStream dstream, int startline,
294:                    int startcolumn) {
295:                this (dstream, startline, startcolumn, 4096);
296:            }
297:
298:            public SimpleCharStream(java.io.InputStream dstream, String encoding)
299:                    throws java.io.UnsupportedEncodingException {
300:                this (dstream, encoding, 1, 1, 4096);
301:            }
302:
303:            public SimpleCharStream(java.io.InputStream dstream) {
304:                this (dstream, 1, 1, 4096);
305:            }
306:
307:            public void ReInit(java.io.InputStream dstream, String encoding,
308:                    int startline, int startcolumn, int buffersize)
309:                    throws java.io.UnsupportedEncodingException {
310:                ReInit(
311:                        encoding == null ? new java.io.InputStreamReader(
312:                                dstream) : new java.io.InputStreamReader(
313:                                dstream, encoding), startline, startcolumn,
314:                        buffersize);
315:            }
316:
317:            public void ReInit(java.io.InputStream dstream, int startline,
318:                    int startcolumn, int buffersize) {
319:                ReInit(new java.io.InputStreamReader(dstream), startline,
320:                        startcolumn, buffersize);
321:            }
322:
323:            public void ReInit(java.io.InputStream dstream, String encoding)
324:                    throws java.io.UnsupportedEncodingException {
325:                ReInit(dstream, encoding, 1, 1, 4096);
326:            }
327:
328:            public void ReInit(java.io.InputStream dstream) {
329:                ReInit(dstream, 1, 1, 4096);
330:            }
331:
332:            public void ReInit(java.io.InputStream dstream, String encoding,
333:                    int startline, int startcolumn)
334:                    throws java.io.UnsupportedEncodingException {
335:                ReInit(dstream, encoding, startline, startcolumn, 4096);
336:            }
337:
338:            public void ReInit(java.io.InputStream dstream, int startline,
339:                    int startcolumn) {
340:                ReInit(dstream, startline, startcolumn, 4096);
341:            }
342:
343:            public String GetImage() {
344:                if (bufpos >= tokenBegin)
345:                    return new String(buffer, tokenBegin, bufpos - tokenBegin
346:                            + 1);
347:                else
348:                    return new String(buffer, tokenBegin, bufsize - tokenBegin)
349:                            + new String(buffer, 0, bufpos + 1);
350:            }
351:
352:            public char[] GetSuffix(int len) {
353:                char[] ret = new char[len];
354:
355:                if ((bufpos + 1) >= len)
356:                    System.arraycopy(buffer, bufpos - len + 1, ret, 0, len);
357:                else {
358:                    System.arraycopy(buffer, bufsize - (len - bufpos - 1), ret,
359:                            0, len - bufpos - 1);
360:                    System.arraycopy(buffer, 0, ret, len - bufpos - 1,
361:                            bufpos + 1);
362:                }
363:
364:                return ret;
365:            }
366:
367:            public void Done() {
368:                buffer = null;
369:                bufline = null;
370:                bufcolumn = null;
371:            }
372:
373:            /**
374:             * Method to adjust line and column numbers for the start of a token.
375:             */
376:            public void adjustBeginLineColumn(int newLine, int newCol) {
377:                int start = tokenBegin;
378:                int len;
379:
380:                if (bufpos >= tokenBegin) {
381:                    len = bufpos - tokenBegin + inBuf + 1;
382:                } else {
383:                    len = bufsize - tokenBegin + bufpos + 1 + inBuf;
384:                }
385:
386:                int i = 0, j = 0, k = 0;
387:                int nextColDiff = 0, columnDiff = 0;
388:
389:                while (i < len
390:                        && bufline[j = start % bufsize] == bufline[k = ++start
391:                                % bufsize]) {
392:                    bufline[j] = newLine;
393:                    nextColDiff = columnDiff + bufcolumn[k] - bufcolumn[j];
394:                    bufcolumn[j] = newCol + columnDiff;
395:                    columnDiff = nextColDiff;
396:                    i++;
397:                }
398:
399:                if (i < len) {
400:                    bufline[j] = newLine++;
401:                    bufcolumn[j] = newCol + columnDiff;
402:
403:                    while (i++ < len) {
404:                        if (bufline[j = start % bufsize] != bufline[++start
405:                                % bufsize])
406:                            bufline[j] = newLine++;
407:                        else
408:                            bufline[j] = newLine;
409:                    }
410:                }
411:
412:                line = bufline[j];
413:                column = bufcolumn[j];
414:            }
415:
416:        }
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