Source Code Cross Referenced for SimpleCharStream.java in  » Content-Management-System » apache-lenya-2.0 » org » apache » cocoon » components » xpointer » parser » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Content Management System » apache lenya 2.0 » org.apache.cocoon.components.xpointer.parser 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Licensed to the Apache Software Foundation (ASF) under one or more
003:         * contributor license agreements.  See the NOTICE file distributed with
004:         * this work for additional information regarding copyright ownership.
005:         * The ASF licenses this file to You under the Apache License, Version 2.0
006:         * (the "License"); you may not use this file except in compliance with
007:         * the License.  You may obtain a copy of the License at
008:         * 
009:         *      http://www.apache.org/licenses/LICENSE-2.0
010:         * 
011:         * Unless required by applicable law or agreed to in writing, software
012:         * distributed under the License is distributed on an "AS IS" BASIS,
013:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014:         * See the License for the specific language governing permissions and
015:         * limitations under the License.
016:         */
017:        package org.apache.cocoon.components.xpointer.parser;
018:
019:        /**
020:         * An implementation of interface CharStream, where the stream is assumed to
021:         * contain only ASCII characters (without unicode processing).
022:         * 
023:         * @version CVS $Id: SimpleCharStream.java 433543 2006-08-22 06:22:54Z crossley $
024:         */
025:
026:        public class SimpleCharStream {
027:            public static final boolean staticFlag = false;
028:            int bufsize;
029:            int available;
030:            int tokenBegin;
031:            public int bufpos = -1;
032:            protected int bufline[];
033:            protected int bufcolumn[];
034:
035:            protected int column = 0;
036:            protected int line = 1;
037:
038:            protected boolean prevCharIsCR = false;
039:            protected boolean prevCharIsLF = false;
040:
041:            protected java.io.Reader inputStream;
042:
043:            protected char[] buffer;
044:            protected int maxNextCharInd = 0;
045:            protected int inBuf = 0;
046:
047:            protected void expandBuff(boolean wrapAround) {
048:                char[] newbuffer = new char[bufsize + 2048];
049:                int newbufline[] = new int[bufsize + 2048];
050:                int newbufcolumn[] = new int[bufsize + 2048];
051:
052:                try {
053:                    if (wrapAround) {
054:                        System.arraycopy(buffer, tokenBegin, newbuffer, 0,
055:                                bufsize - tokenBegin);
056:                        System.arraycopy(buffer, 0, newbuffer, bufsize
057:                                - tokenBegin, bufpos);
058:                        buffer = newbuffer;
059:
060:                        System.arraycopy(bufline, tokenBegin, newbufline, 0,
061:                                bufsize - tokenBegin);
062:                        System.arraycopy(bufline, 0, newbufline, bufsize
063:                                - tokenBegin, bufpos);
064:                        bufline = newbufline;
065:
066:                        System.arraycopy(bufcolumn, tokenBegin, newbufcolumn,
067:                                0, bufsize - tokenBegin);
068:                        System.arraycopy(bufcolumn, 0, newbufcolumn, bufsize
069:                                - tokenBegin, bufpos);
070:                        bufcolumn = newbufcolumn;
071:
072:                        maxNextCharInd = (bufpos += (bufsize - tokenBegin));
073:                    } else {
074:                        System.arraycopy(buffer, tokenBegin, newbuffer, 0,
075:                                bufsize - tokenBegin);
076:                        buffer = newbuffer;
077:
078:                        System.arraycopy(bufline, tokenBegin, newbufline, 0,
079:                                bufsize - tokenBegin);
080:                        bufline = newbufline;
081:
082:                        System.arraycopy(bufcolumn, tokenBegin, newbufcolumn,
083:                                0, bufsize - tokenBegin);
084:                        bufcolumn = newbufcolumn;
085:
086:                        maxNextCharInd = (bufpos -= tokenBegin);
087:                    }
088:                } catch (Throwable t) {
089:                    throw new Error(t.getMessage());
090:                }
091:
092:                bufsize += 2048;
093:                available = bufsize;
094:                tokenBegin = 0;
095:            }
096:
097:            protected void fillBuff() throws java.io.IOException {
098:                if (maxNextCharInd == available) {
099:                    if (available == bufsize) {
100:                        if (tokenBegin > 2048) {
101:                            bufpos = maxNextCharInd = 0;
102:                            available = tokenBegin;
103:                        } else if (tokenBegin < 0)
104:                            bufpos = maxNextCharInd = 0;
105:                        else
106:                            expandBuff(false);
107:                    } else if (available > tokenBegin)
108:                        available = bufsize;
109:                    else if ((tokenBegin - available) < 2048)
110:                        expandBuff(true);
111:                    else
112:                        available = tokenBegin;
113:                }
114:
115:                int i;
116:                try {
117:                    if ((i = inputStream.read(buffer, maxNextCharInd, available
118:                            - maxNextCharInd)) == -1) {
119:                        inputStream.close();
120:                        throw new java.io.IOException();
121:                    } else
122:                        maxNextCharInd += i;
123:                    return;
124:                } catch (java.io.IOException e) {
125:                    --bufpos;
126:                    backup(0);
127:                    if (tokenBegin == -1)
128:                        tokenBegin = bufpos;
129:                    throw e;
130:                }
131:            }
132:
133:            public char beginToken() throws java.io.IOException {
134:                tokenBegin = -1;
135:                char c = readChar();
136:                tokenBegin = bufpos;
137:
138:                return c;
139:            }
140:
141:            protected void updateLineColumn(char c) {
142:                column++;
143:
144:                if (prevCharIsLF) {
145:                    prevCharIsLF = false;
146:                    line += (column = 1);
147:                } else if (prevCharIsCR) {
148:                    prevCharIsCR = false;
149:                    if (c == '\n') {
150:                        prevCharIsLF = true;
151:                    } else
152:                        line += (column = 1);
153:                }
154:
155:                switch (c) {
156:                case '\r':
157:                    prevCharIsCR = true;
158:                    break;
159:                case '\n':
160:                    prevCharIsLF = true;
161:                    break;
162:                case '\t':
163:                    column--;
164:                    column += (8 - (column & 07));
165:                    break;
166:                default:
167:                    break;
168:                }
169:
170:                bufline[bufpos] = line;
171:                bufcolumn[bufpos] = column;
172:            }
173:
174:            public char readChar() throws java.io.IOException {
175:                if (inBuf > 0) {
176:                    --inBuf;
177:
178:                    if (++bufpos == bufsize)
179:                        bufpos = 0;
180:
181:                    return buffer[bufpos];
182:                }
183:
184:                if (++bufpos >= maxNextCharInd)
185:                    fillBuff();
186:
187:                char c = buffer[bufpos];
188:
189:                updateLineColumn(c);
190:                return (c);
191:            }
192:
193:            /**
194:             * @deprecated 
195:             * @see #getEndColumn()
196:             */
197:
198:            public int getColumn() {
199:                return bufcolumn[bufpos];
200:            }
201:
202:            /**
203:             * @deprecated 
204:             * @see #getEndLine()
205:             */
206:
207:            public int getLine() {
208:                return bufline[bufpos];
209:            }
210:
211:            public int getEndColumn() {
212:                return bufcolumn[bufpos];
213:            }
214:
215:            public int getEndLine() {
216:                return bufline[bufpos];
217:            }
218:
219:            public int getBeginColumn() {
220:                return bufcolumn[tokenBegin];
221:            }
222:
223:            public int getBeginLine() {
224:                return bufline[tokenBegin];
225:            }
226:
227:            public void backup(int amount) {
228:
229:                inBuf += amount;
230:                if ((bufpos -= amount) < 0)
231:                    bufpos += bufsize;
232:            }
233:
234:            public SimpleCharStream(java.io.Reader dstream, int startline,
235:                    int startcolumn, int buffersize) {
236:                inputStream = dstream;
237:                line = startline;
238:                column = startcolumn - 1;
239:
240:                available = bufsize = buffersize;
241:                buffer = new char[buffersize];
242:                bufline = new int[buffersize];
243:                bufcolumn = new int[buffersize];
244:            }
245:
246:            public SimpleCharStream(java.io.Reader dstream, int startline,
247:                    int startcolumn) {
248:                this (dstream, startline, startcolumn, 4096);
249:            }
250:
251:            public SimpleCharStream(java.io.Reader dstream) {
252:                this (dstream, 1, 1, 4096);
253:            }
254:
255:            public void reInit(java.io.Reader dstream, int startline,
256:                    int startcolumn, int buffersize) {
257:                inputStream = dstream;
258:                line = startline;
259:                column = startcolumn - 1;
260:
261:                if (buffer == null || buffersize != buffer.length) {
262:                    available = bufsize = buffersize;
263:                    buffer = new char[buffersize];
264:                    bufline = new int[buffersize];
265:                    bufcolumn = new int[buffersize];
266:                }
267:                prevCharIsLF = prevCharIsCR = false;
268:                tokenBegin = inBuf = maxNextCharInd = 0;
269:                bufpos = -1;
270:            }
271:
272:            public void reInit(java.io.Reader dstream, int startline,
273:                    int startcolumn) {
274:                reInit(dstream, startline, startcolumn, 4096);
275:            }
276:
277:            public void reInit(java.io.Reader dstream) {
278:                reInit(dstream, 1, 1, 4096);
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, int startline,
288:                    int startcolumn) {
289:                this (dstream, startline, startcolumn, 4096);
290:            }
291:
292:            public SimpleCharStream(java.io.InputStream dstream) {
293:                this (dstream, 1, 1, 4096);
294:            }
295:
296:            public void reInit(java.io.InputStream dstream, int startline,
297:                    int startcolumn, int buffersize) {
298:                reInit(new java.io.InputStreamReader(dstream), startline,
299:                        startcolumn, buffersize);
300:            }
301:
302:            public void reInit(java.io.InputStream dstream) {
303:                reInit(dstream, 1, 1, 4096);
304:            }
305:
306:            public void reInit(java.io.InputStream dstream, int startline,
307:                    int startcolumn) {
308:                reInit(dstream, startline, startcolumn, 4096);
309:            }
310:
311:            public String getImage() {
312:                if (bufpos >= tokenBegin)
313:                    return new String(buffer, tokenBegin, bufpos - tokenBegin
314:                            + 1);
315:                else
316:                    return new String(buffer, tokenBegin, bufsize - tokenBegin)
317:                            + new String(buffer, 0, bufpos + 1);
318:            }
319:
320:            public char[] getSuffix(int len) {
321:                char[] ret = new char[len];
322:
323:                if ((bufpos + 1) >= len)
324:                    System.arraycopy(buffer, bufpos - len + 1, ret, 0, len);
325:                else {
326:                    System.arraycopy(buffer, bufsize - (len - bufpos - 1), ret,
327:                            0, len - bufpos - 1);
328:                    System.arraycopy(buffer, 0, ret, len - bufpos - 1,
329:                            bufpos + 1);
330:                }
331:
332:                return ret;
333:            }
334:
335:            public void done() {
336:                buffer = null;
337:                bufline = null;
338:                bufcolumn = null;
339:            }
340:
341:            /**
342:             * Method to adjust line and column numbers for the start of a token.<BR>
343:             */
344:            public void adjustBeginLineColumn(int newLine, int newCol) {
345:                int start = tokenBegin;
346:                int len;
347:
348:                if (bufpos >= tokenBegin) {
349:                    len = bufpos - tokenBegin + inBuf + 1;
350:                } else {
351:                    len = bufsize - tokenBegin + bufpos + 1 + inBuf;
352:                }
353:
354:                int i = 0, j = 0, k = 0;
355:                int nextColDiff = 0, columnDiff = 0;
356:
357:                while (i < len
358:                        && bufline[j = start % bufsize] == bufline[k = ++start
359:                                % bufsize]) {
360:                    bufline[j] = newLine;
361:                    nextColDiff = columnDiff + bufcolumn[k] - bufcolumn[j];
362:                    bufcolumn[j] = newCol + columnDiff;
363:                    columnDiff = nextColDiff;
364:                    i++;
365:                }
366:
367:                if (i < len) {
368:                    bufline[j] = newLine++;
369:                    bufcolumn[j] = newCol + columnDiff;
370:
371:                    while (i++ < len) {
372:                        if (bufline[j = start % bufsize] != bufline[++start
373:                                % bufsize])
374:                            bufline[j] = newLine++;
375:                        else
376:                            bufline[j] = newLine;
377:                    }
378:                }
379:
380:                line = bufline[j];
381:                column = bufcolumn[j];
382:            }
383:
384:        }
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