Source Code Cross Referenced for UCode_CharStream.java in  » Database-DBMS » db-derby-10.2 » org » apache » derby » impl » tools » ij » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » db derby 10.2 » org.apache.derby.impl.tools.ij 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:
003:           Derby - Class org.apache.derby.impl.tools.ij.UCode_CharStream
004:
005:           Licensed to the Apache Software Foundation (ASF) under one or more
006:           contributor license agreements.  See the NOTICE file distributed with
007:           this work for additional information regarding copyright ownership.
008:           The ASF licenses this file to You under the Apache License, Version 2.0
009:           (the "License"); you may not use this file except in compliance with
010:           the License.  You may obtain a copy of the License at
011:
012:              http://www.apache.org/licenses/LICENSE-2.0
013:
014:           Unless required by applicable law or agreed to in writing, software
015:           distributed under the License is distributed on an "AS IS" BASIS,
016:           WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
017:           See the License for the specific language governing permissions and
018:           limitations under the License.
019:
020:         */
021:
022:        /* Generated By:JavaCC: Do not edit this line. UCode_CharStream.java Version 0.7pre6 */
023:        package org.apache.derby.impl.tools.ij;
024:
025:        /**
026:         * An implementation of interface CharStream, where the stream is assumed to
027:         * contain only Unicode characters.
028:         */
029:
030:        public final class UCode_CharStream implements  CharStream {
031:            public static final boolean staticFlag = false;
032:            public int bufpos = -1;
033:            int bufsize;
034:            int available;
035:            int tokenBegin;
036:            private int bufline[];
037:            private int bufcolumn[];
038:
039:            private int column = 0;
040:            private int line = 1;
041:
042:            private boolean prevCharIsCR = false;
043:            private boolean prevCharIsLF = false;
044:
045:            private java.io.Reader inputStream;
046:
047:            private char[] nextCharBuf;
048:            private char[] buffer;
049:            private int maxNextCharInd = 0;
050:            private int nextCharInd = -1;
051:
052:            private final void ExpandBuff(boolean wrapAround) {
053:                char[] newbuffer = new char[bufsize + 2048];
054:                int newbufline[] = new int[bufsize + 2048];
055:                int newbufcolumn[] = new int[bufsize + 2048];
056:
057:                try {
058:                    if (wrapAround) {
059:                        System.arraycopy(buffer, tokenBegin, newbuffer, 0,
060:                                bufsize - tokenBegin);
061:                        System.arraycopy(buffer, 0, newbuffer, bufsize
062:                                - tokenBegin, bufpos);
063:                        buffer = newbuffer;
064:
065:                        System.arraycopy(bufline, tokenBegin, newbufline, 0,
066:                                bufsize - tokenBegin);
067:                        System.arraycopy(bufline, 0, newbufline, bufsize
068:                                - tokenBegin, bufpos);
069:                        bufline = newbufline;
070:
071:                        System.arraycopy(bufcolumn, tokenBegin, newbufcolumn,
072:                                0, bufsize - tokenBegin);
073:                        System.arraycopy(bufcolumn, 0, newbufcolumn, bufsize
074:                                - tokenBegin, bufpos);
075:                        bufcolumn = newbufcolumn;
076:
077:                        bufpos += (bufsize - tokenBegin);
078:                    } else {
079:                        System.arraycopy(buffer, tokenBegin, newbuffer, 0,
080:                                bufsize - tokenBegin);
081:                        buffer = newbuffer;
082:
083:                        System.arraycopy(bufline, tokenBegin, newbufline, 0,
084:                                bufsize - tokenBegin);
085:                        bufline = newbufline;
086:
087:                        System.arraycopy(bufcolumn, tokenBegin, newbufcolumn,
088:                                0, bufsize - tokenBegin);
089:                        bufcolumn = newbufcolumn;
090:
091:                        bufpos -= tokenBegin;
092:                    }
093:                } catch (Throwable t) {
094:                    throw new Error(t.getMessage());
095:                }
096:
097:                available = (bufsize += 2048);
098:                tokenBegin = 0;
099:            }
100:
101:            private final void FillBuff() throws java.io.IOException {
102:                if (maxNextCharInd == 4096)
103:                    maxNextCharInd = nextCharInd = 0;
104:
105:                int i;
106:                try {
107:                    if ((i = inputStream.read(nextCharBuf, maxNextCharInd,
108:                            4096 - maxNextCharInd)) == -1) {
109:                        inputStream.close();
110:                        throw new java.io.IOException();
111:                    } else
112:                        maxNextCharInd += i;
113:                    return;
114:                } catch (java.io.IOException e) {
115:                    if (bufpos != 0) {
116:                        --bufpos;
117:                        backup(0);
118:                    } else {
119:                        bufline[bufpos] = line;
120:                        bufcolumn[bufpos] = column;
121:                    }
122:                    if (tokenBegin == -1)
123:                        tokenBegin = bufpos;
124:                    throw e;
125:                }
126:            }
127:
128:            private final char ReadChar() throws java.io.IOException {
129:                if (++nextCharInd >= maxNextCharInd)
130:                    FillBuff();
131:
132:                return nextCharBuf[nextCharInd];
133:            }
134:
135:            public char BeginToken() throws java.io.IOException {
136:                tokenBegin = -1;
137:                char c = readChar();
138:                tokenBegin = bufpos;
139:
140:                return c;
141:            }
142:
143:            private final void UpdateLineColumn(char c) {
144:                column++;
145:
146:                if (prevCharIsLF) {
147:                    prevCharIsLF = false;
148:                    line += (column = 1);
149:                } else if (prevCharIsCR) {
150:                    prevCharIsCR = false;
151:                    if (c == '\n') {
152:                        prevCharIsLF = true;
153:                    } else
154:                        line += (column = 1);
155:                }
156:
157:                switch (c) {
158:                case '\r':
159:                    prevCharIsCR = true;
160:                    break;
161:                case '\n':
162:                    prevCharIsLF = true;
163:                    break;
164:                case '\t':
165:                    column--;
166:                    column += (8 - (column & 07));
167:                    break;
168:                default:
169:                    break;
170:                }
171:            }
172:
173:            private int inBuf = 0;
174:
175:            public final char readChar() throws java.io.IOException {
176:                if (inBuf > 0) {
177:                    --inBuf;
178:                    return (char) buffer[(bufpos == bufsize - 1) ? (bufpos = 0)
179:                            : ++bufpos];
180:                }
181:
182:                bufpos++;
183:                char c = ReadChar();
184:                UpdateLineColumn(c);
185:
186:                if (bufpos == available) {
187:                    if (available == bufsize) {
188:                        if (tokenBegin > 2048) {
189:                            bufpos = 0;
190:                            available = tokenBegin;
191:                        } else if (tokenBegin < 0)
192:                            bufpos = 0;
193:                        else
194:                            ExpandBuff(false);
195:                    } else if (available > tokenBegin)
196:                        available = bufsize;
197:                    else if ((tokenBegin - available) < 2048)
198:                        ExpandBuff(true);
199:                    else
200:                        available = tokenBegin;
201:                }
202:
203:                return (buffer[bufpos] = c);
204:            }
205:
206:            /**
207:             * @deprecated 
208:             * @see #getEndColumn
209:             */
210:
211:            public final int getColumn() {
212:                return bufcolumn[bufpos];
213:            }
214:
215:            /**
216:             * @deprecated 
217:             * @see #getEndLine
218:             */
219:
220:            public final int getLine() {
221:                return bufline[bufpos];
222:            }
223:
224:            public final int getEndColumn() {
225:                return bufcolumn[bufpos];
226:            }
227:
228:            public final int getEndLine() {
229:                return bufline[bufpos];
230:            }
231:
232:            public final int getBeginColumn() {
233:                return bufcolumn[tokenBegin];
234:            }
235:
236:            public final int getBeginLine() {
237:                return bufline[tokenBegin];
238:            }
239:
240:            public final void backup(int amount) {
241:
242:                inBuf += amount;
243:                if ((bufpos -= amount) < 0)
244:                    bufpos += bufsize;
245:            }
246:
247:            public UCode_CharStream(java.io.Reader dstream, int startline,
248:                    int startcolumn, int buffersize) {
249:                inputStream = dstream;
250:                line = startline;
251:                column = startcolumn - 1;
252:
253:                available = bufsize = buffersize;
254:                buffer = new char[buffersize];
255:                nextCharBuf = new char[buffersize];
256:                bufline = new int[buffersize];
257:                bufcolumn = new int[buffersize];
258:            }
259:
260:            public UCode_CharStream(java.io.Reader dstream, int startline,
261:                    int startcolumn) {
262:                this (dstream, startline, startcolumn, 4096);
263:            }
264:
265:            public void ReInit(java.io.Reader dstream, int startline,
266:                    int startcolumn, int buffersize) {
267:                inputStream = dstream;
268:                line = startline;
269:                column = startcolumn - 1;
270:
271:                if (buffer == null || buffersize != buffer.length) {
272:                    available = bufsize = buffersize;
273:                    buffer = new char[buffersize];
274:                    nextCharBuf = new char[buffersize];
275:                    bufline = new int[buffersize];
276:                    bufcolumn = new int[buffersize];
277:                }
278:                tokenBegin = inBuf = maxNextCharInd = 0;
279:                nextCharInd = bufpos = -1;
280:            }
281:
282:            public void ReInit(java.io.Reader dstream, int startline,
283:                    int startcolumn) {
284:                ReInit(dstream, startline, startcolumn, 4096);
285:            }
286:
287:            public UCode_CharStream(java.io.InputStream dstream, int startline,
288:                    int startcolumn, int buffersize) {
289:                this (new java.io.InputStreamReader(dstream), startline,
290:                        startcolumn, 4096);
291:            }
292:
293:            public UCode_CharStream(java.io.InputStream dstream, int startline,
294:                    int startcolumn) {
295:                this (dstream, startline, startcolumn, 4096);
296:            }
297:
298:            public void ReInit(java.io.InputStream dstream, int startline,
299:                    int startcolumn, int buffersize) {
300:                ReInit(new java.io.InputStreamReader(dstream), startline,
301:                        startcolumn, 4096);
302:            }
303:
304:            public void ReInit(java.io.InputStream dstream, int startline,
305:                    int startcolumn) {
306:                ReInit(dstream, startline, startcolumn, 4096);
307:            }
308:
309:            public final String GetImage() {
310:                if (bufpos >= tokenBegin)
311:                    return new String(buffer, tokenBegin, bufpos - tokenBegin
312:                            + 1);
313:                else
314:                    return new String(buffer, tokenBegin, bufsize - tokenBegin)
315:                            + new String(buffer, 0, bufpos + 1);
316:            }
317:
318:            public final char[] GetSuffix(int len) {
319:                char[] ret = new char[len];
320:
321:                if ((bufpos + 1) >= len)
322:                    System.arraycopy(buffer, bufpos - len + 1, ret, 0, len);
323:                else {
324:                    System.arraycopy(buffer, bufsize - (len - bufpos - 1), ret,
325:                            0, len - bufpos - 1);
326:                    System.arraycopy(buffer, 0, ret, len - bufpos - 1,
327:                            bufpos + 1);
328:                }
329:
330:                return ret;
331:            }
332:
333:            public void Done() {
334:                nextCharBuf = null;
335:                buffer = null;
336:                bufline = null;
337:                bufcolumn = null;
338:            }
339:
340:            /**
341:             * Method to adjust line and column numbers for the start of a token.<BR>
342:             */
343:            public void adjustBeginLineColumn(int newLine, int newCol) {
344:                int start = tokenBegin;
345:                int len;
346:
347:                if (bufpos >= tokenBegin) {
348:                    len = bufpos - tokenBegin + inBuf + 1;
349:                } else {
350:                    len = bufsize - tokenBegin + bufpos + 1 + inBuf;
351:                }
352:
353:                int i = 0, j = 0, k = 0;
354:                int nextColDiff = 0, columnDiff = 0;
355:
356:                while (i < len
357:                        && bufline[j = start % bufsize] == bufline[k = ++start
358:                                % bufsize]) {
359:                    bufline[j] = newLine;
360:                    nextColDiff = columnDiff + bufcolumn[k] - bufcolumn[j];
361:                    bufcolumn[j] = newCol + columnDiff;
362:                    columnDiff = nextColDiff;
363:                    i++;
364:                }
365:
366:                if (i < len) {
367:                    bufline[j] = newLine++;
368:                    bufcolumn[j] = newCol + columnDiff;
369:
370:                    while (i++ < len) {
371:                        if (bufline[j = start % bufsize] != bufline[++start
372:                                % bufsize])
373:                            bufline[j] = newLine++;
374:                        else
375:                            bufline[j] = newLine;
376:                    }
377:                }
378:
379:                line = bufline[j];
380:                column = bufcolumn[j];
381:            }
382:
383:        }
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