Source Code Cross Referenced for SimpleCharStream.java in  » J2EE » apache-common-EL » org » apache » commons » el » parser » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » apache common EL » org.apache.commons.el.parser 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* Generated By:JavaCC: Do not edit this line. SimpleCharStream.java Version 2.1 */
002:        package org.apache.commons.el.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 final class SimpleCharStream {
010:            public static final boolean staticFlag = false;
011:            int bufsize;
012:            int available;
013:            int tokenBegin;
014:            public int bufpos = -1;
015:            private int bufline[];
016:            private int bufcolumn[];
017:
018:            private int column = 0;
019:            private int line = 1;
020:
021:            private boolean prevCharIsCR = false;
022:            private boolean prevCharIsLF = false;
023:
024:            private java.io.Reader inputStream;
025:
026:            private char[] buffer;
027:            private int maxNextCharInd = 0;
028:            private int inBuf = 0;
029:
030:            private final void ExpandBuff(boolean wrapAround) {
031:                char[] newbuffer = new char[bufsize + 2048];
032:                int newbufline[] = new int[bufsize + 2048];
033:                int newbufcolumn[] = new int[bufsize + 2048];
034:
035:                try {
036:                    if (wrapAround) {
037:                        System.arraycopy(buffer, tokenBegin, newbuffer, 0,
038:                                bufsize - tokenBegin);
039:                        System.arraycopy(buffer, 0, newbuffer, bufsize
040:                                - tokenBegin, bufpos);
041:                        buffer = newbuffer;
042:
043:                        System.arraycopy(bufline, tokenBegin, newbufline, 0,
044:                                bufsize - tokenBegin);
045:                        System.arraycopy(bufline, 0, newbufline, bufsize
046:                                - tokenBegin, bufpos);
047:                        bufline = newbufline;
048:
049:                        System.arraycopy(bufcolumn, tokenBegin, newbufcolumn,
050:                                0, bufsize - tokenBegin);
051:                        System.arraycopy(bufcolumn, 0, newbufcolumn, bufsize
052:                                - tokenBegin, bufpos);
053:                        bufcolumn = newbufcolumn;
054:
055:                        maxNextCharInd = (bufpos += (bufsize - tokenBegin));
056:                    } else {
057:                        System.arraycopy(buffer, tokenBegin, newbuffer, 0,
058:                                bufsize - tokenBegin);
059:                        buffer = newbuffer;
060:
061:                        System.arraycopy(bufline, tokenBegin, newbufline, 0,
062:                                bufsize - tokenBegin);
063:                        bufline = newbufline;
064:
065:                        System.arraycopy(bufcolumn, tokenBegin, newbufcolumn,
066:                                0, bufsize - tokenBegin);
067:                        bufcolumn = newbufcolumn;
068:
069:                        maxNextCharInd = (bufpos -= tokenBegin);
070:                    }
071:                } catch (Throwable t) {
072:                    throw new Error(t.getMessage());
073:                }
074:
075:                bufsize += 2048;
076:                available = bufsize;
077:                tokenBegin = 0;
078:            }
079:
080:            private final void FillBuff() throws java.io.IOException {
081:                if (maxNextCharInd == available) {
082:                    if (available == bufsize) {
083:                        if (tokenBegin > 2048) {
084:                            bufpos = maxNextCharInd = 0;
085:                            available = tokenBegin;
086:                        } else if (tokenBegin < 0)
087:                            bufpos = maxNextCharInd = 0;
088:                        else
089:                            ExpandBuff(false);
090:                    } else if (available > tokenBegin)
091:                        available = bufsize;
092:                    else if ((tokenBegin - available) < 2048)
093:                        ExpandBuff(true);
094:                    else
095:                        available = tokenBegin;
096:                }
097:
098:                int i;
099:                try {
100:                    if ((i = inputStream.read(buffer, maxNextCharInd, available
101:                            - maxNextCharInd)) == -1) {
102:                        inputStream.close();
103:                        throw new java.io.IOException();
104:                    } else
105:                        maxNextCharInd += i;
106:                    return;
107:                } catch (java.io.IOException e) {
108:                    --bufpos;
109:                    backup(0);
110:                    if (tokenBegin == -1)
111:                        tokenBegin = bufpos;
112:                    throw e;
113:                }
114:            }
115:
116:            public final char BeginToken() throws java.io.IOException {
117:                tokenBegin = -1;
118:                char c = readChar();
119:                tokenBegin = bufpos;
120:
121:                return c;
122:            }
123:
124:            private final void UpdateLineColumn(char c) {
125:                column++;
126:
127:                if (prevCharIsLF) {
128:                    prevCharIsLF = false;
129:                    line += (column = 1);
130:                } else if (prevCharIsCR) {
131:                    prevCharIsCR = false;
132:                    if (c == '\n') {
133:                        prevCharIsLF = true;
134:                    } else
135:                        line += (column = 1);
136:                }
137:
138:                switch (c) {
139:                case '\r':
140:                    prevCharIsCR = true;
141:                    break;
142:                case '\n':
143:                    prevCharIsLF = true;
144:                    break;
145:                case '\t':
146:                    column--;
147:                    column += (8 - (column & 07));
148:                    break;
149:                default:
150:                    break;
151:                }
152:
153:                bufline[bufpos] = line;
154:                bufcolumn[bufpos] = column;
155:            }
156:
157:            public final char readChar() throws java.io.IOException {
158:                if (inBuf > 0) {
159:                    --inBuf;
160:
161:                    if (++bufpos == bufsize)
162:                        bufpos = 0;
163:
164:                    return buffer[bufpos];
165:                }
166:
167:                if (++bufpos >= maxNextCharInd)
168:                    FillBuff();
169:
170:                char c = buffer[bufpos];
171:
172:                UpdateLineColumn(c);
173:                return (c);
174:            }
175:
176:            /**
177:             * @deprecated 
178:             * @see #getEndColumn
179:             */
180:
181:            public final int getColumn() {
182:                return bufcolumn[bufpos];
183:            }
184:
185:            /**
186:             * @deprecated 
187:             * @see #getEndLine
188:             */
189:
190:            public final int getLine() {
191:                return bufline[bufpos];
192:            }
193:
194:            public final int getEndColumn() {
195:                return bufcolumn[bufpos];
196:            }
197:
198:            public final int getEndLine() {
199:                return bufline[bufpos];
200:            }
201:
202:            public final int getBeginColumn() {
203:                return bufcolumn[tokenBegin];
204:            }
205:
206:            public final int getBeginLine() {
207:                return bufline[tokenBegin];
208:            }
209:
210:            public final void backup(int amount) {
211:
212:                inBuf += amount;
213:                if ((bufpos -= amount) < 0)
214:                    bufpos += bufsize;
215:            }
216:
217:            public SimpleCharStream(java.io.Reader dstream, int startline,
218:                    int startcolumn, int buffersize) {
219:                inputStream = dstream;
220:                line = startline;
221:                column = startcolumn - 1;
222:
223:                available = bufsize = buffersize;
224:                buffer = new char[buffersize];
225:                bufline = new int[buffersize];
226:                bufcolumn = new int[buffersize];
227:            }
228:
229:            public SimpleCharStream(java.io.Reader dstream, int startline,
230:                    int startcolumn) {
231:                this (dstream, startline, startcolumn, 4096);
232:            }
233:
234:            public SimpleCharStream(java.io.Reader dstream) {
235:                this (dstream, 1, 1, 4096);
236:            }
237:
238:            public void ReInit(java.io.Reader dstream, int startline,
239:                    int startcolumn, int buffersize) {
240:                inputStream = dstream;
241:                line = startline;
242:                column = startcolumn - 1;
243:
244:                if (buffer == null || buffersize != buffer.length) {
245:                    available = bufsize = buffersize;
246:                    buffer = new char[buffersize];
247:                    bufline = new int[buffersize];
248:                    bufcolumn = new int[buffersize];
249:                }
250:                prevCharIsLF = prevCharIsCR = false;
251:                tokenBegin = inBuf = maxNextCharInd = 0;
252:                bufpos = -1;
253:            }
254:
255:            public void ReInit(java.io.Reader dstream, int startline,
256:                    int startcolumn) {
257:                ReInit(dstream, startline, startcolumn, 4096);
258:            }
259:
260:            public void ReInit(java.io.Reader dstream) {
261:                ReInit(dstream, 1, 1, 4096);
262:            }
263:
264:            public SimpleCharStream(java.io.InputStream dstream, int startline,
265:                    int startcolumn, int buffersize) {
266:                this (new java.io.InputStreamReader(dstream), startline,
267:                        startcolumn, 4096);
268:            }
269:
270:            public SimpleCharStream(java.io.InputStream dstream, int startline,
271:                    int startcolumn) {
272:                this (dstream, startline, startcolumn, 4096);
273:            }
274:
275:            public SimpleCharStream(java.io.InputStream dstream) {
276:                this (dstream, 1, 1, 4096);
277:            }
278:
279:            public void ReInit(java.io.InputStream dstream, int startline,
280:                    int startcolumn, int buffersize) {
281:                ReInit(new java.io.InputStreamReader(dstream), startline,
282:                        startcolumn, 4096);
283:            }
284:
285:            public void ReInit(java.io.InputStream dstream) {
286:                ReInit(dstream, 1, 1, 4096);
287:            }
288:
289:            public void ReInit(java.io.InputStream dstream, int startline,
290:                    int startcolumn) {
291:                ReInit(dstream, startline, startcolumn, 4096);
292:            }
293:
294:            public final String GetImage() {
295:                if (bufpos >= tokenBegin)
296:                    return new String(buffer, tokenBegin, bufpos - tokenBegin
297:                            + 1);
298:                else
299:                    return new String(buffer, tokenBegin, bufsize - tokenBegin)
300:                            + new String(buffer, 0, bufpos + 1);
301:            }
302:
303:            public final char[] GetSuffix(int len) {
304:                char[] ret = new char[len];
305:
306:                if ((bufpos + 1) >= len)
307:                    System.arraycopy(buffer, bufpos - len + 1, ret, 0, len);
308:                else {
309:                    System.arraycopy(buffer, bufsize - (len - bufpos - 1), ret,
310:                            0, len - bufpos - 1);
311:                    System.arraycopy(buffer, 0, ret, len - bufpos - 1,
312:                            bufpos + 1);
313:                }
314:
315:                return ret;
316:            }
317:
318:            public void Done() {
319:                buffer = null;
320:                bufline = null;
321:                bufcolumn = null;
322:            }
323:
324:            /**
325:             * Method to adjust line and column numbers for the start of a token.<BR>
326:             */
327:            public void adjustBeginLineColumn(int newLine, int newCol) {
328:                int start = tokenBegin;
329:                int len;
330:
331:                if (bufpos >= tokenBegin) {
332:                    len = bufpos - tokenBegin + inBuf + 1;
333:                } else {
334:                    len = bufsize - tokenBegin + bufpos + 1 + inBuf;
335:                }
336:
337:                int i = 0, j = 0, k = 0;
338:                int nextColDiff = 0, columnDiff = 0;
339:
340:                while (i < len
341:                        && bufline[j = start % bufsize] == bufline[k = ++start
342:                                % bufsize]) {
343:                    bufline[j] = newLine;
344:                    nextColDiff = columnDiff + bufcolumn[k] - bufcolumn[j];
345:                    bufcolumn[j] = newCol + columnDiff;
346:                    columnDiff = nextColDiff;
347:                    i++;
348:                }
349:
350:                if (i < len) {
351:                    bufline[j] = newLine++;
352:                    bufcolumn[j] = newCol + columnDiff;
353:
354:                    while (i++ < len) {
355:                        if (bufline[j = start % bufsize] != bufline[++start
356:                                % bufsize])
357:                            bufline[j] = newLine++;
358:                        else
359:                            bufline[j] = newLine;
360:                    }
361:                }
362:
363:                line = bufline[j];
364:                column = bufcolumn[j];
365:            }
366:
367:        }
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