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Java Source Code / Java Documentation » Development » Jakarta ORO » org.apache.oro.text.regex 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * $Id: Perl5Substitution.java,v 1.13 2003/11/07 20:16:25 dfs Exp $
003:         *
004:         * ====================================================================
005:         * The Apache Software License, Version 1.1
006:         *
007:         * Copyright (c) 2000 The Apache Software Foundation.  All rights
008:         * reserved.
009:         *
010:         * Redistribution and use in source and binary forms, with or without
011:         * modification, are permitted provided that the following conditions
012:         * are met:
013:         *
014:         * 1. Redistributions of source code must retain the above copyright
015:         *    notice, this list of conditions and the following disclaimer.
016:         *
017:         * 2. Redistributions in binary form must reproduce the above copyright
018:         *    notice, this list of conditions and the following disclaimer in
019:         *    the documentation and/or other materials provided with the
020:         *    distribution.
021:         *
022:         * 3. The end-user documentation included with the redistribution,
023:         *    if any, must include the following acknowledgment:
024:         *       "This product includes software developed by the
025:         *        Apache Software Foundation (http://www.apache.org/)."
026:         *    Alternately, this acknowledgment may appear in the software itself,
027:         *    if and wherever such third-party acknowledgments normally appear.
028:         *
029:         * 4. The names "Apache" and "Apache Software Foundation", "Jakarta-Oro" 
030:         *    must not be used to endorse or promote products derived from this
031:         *    software without prior written permission. For written
032:         *    permission, please contact apache@apache.org.
033:         *
034:         * 5. Products derived from this software may not be called "Apache" 
035:         *    or "Jakarta-Oro", nor may "Apache" or "Jakarta-Oro" appear in their 
036:         *    name, without prior written permission of the Apache Software Foundation.
037:         *
038:         * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
039:         * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
040:         * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
041:         * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
042:         * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
043:         * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
044:         * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
045:         * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
046:         * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
047:         * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
048:         * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
049:         * SUCH DAMAGE.
050:         * ====================================================================
051:         *
052:         * This software consists of voluntary contributions made by many
053:         * individuals on behalf of the Apache Software Foundation.  For more
054:         * information on the Apache Software Foundation, please see
055:         * <http://www.apache.org/>.
056:         */
057:
058:        package org.apache.oro.text.regex;
059:
060:        import java.util.*;
061:
062:        /**
063:         * Perl5Substitution implements a Substitution consisting of a
064:         * literal string, but allowing Perl5 variable interpolation referencing
065:         * saved groups in a match.  This class is intended for use with
066:         * {@link Util#substitute Util.substitute}.
067:         * <p>
068:         * The substitution string may contain variable interpolations referring
069:         * to the saved parenthesized groups of the search pattern.
070:         * A variable interpolation is denoted by <b>$1</b>, or <b>$2</b>,
071:         * or <b>$3</b>, etc.  If you want such expressions to be
072:         * interpreted literally, you should set the <b> numInterpolations </b>
073:         * parameter to <b> INTERPOLATE_NONE </b>.  It is easiest to explain
074:         * what an interpolated variable does by giving an example:
075:         * <ul>
076:         * Suppose you have the pattern <b>b\d+:</b> and you want to substitute
077:         * the <b>b</b>'s for <b>a</b>'s and the colon for a dash in parts of
078:         * your input matching the pattern.  You can do this by changing the
079:         * pattern to <b>b(\d+):</b> and using the substitution expression
080:         * <b>a$1-</b>.  When a substitution is made, the <b>$1</b> means
081:         * "Substitute whatever was matched by the first saved group of the
082:         *  matching pattern."  An input of <b>b123:</b> after substitution
083:         * would yield a result of <b>a123-</b>.  But there's a little more
084:         * to be aware of.  If you set the <b>numInterpolations</b> parameter to
085:         * <b>INTERPOLATE_ALL</b>, then every time a match is found, the 
086:         * interpolation variables are computed relative to that match.
087:         * But if <b>numInterpolations</b> is set to some positive integer, then
088:         * only the interpolation variables for the first <b>numInterpolations</b>
089:         * matches are computed relative to the most recent match.  After that,
090:         * the remaining substitutions have their variable interpolations performed
091:         * relative to the <b> numInterpolations </b>'th match.  So using the
092:         * previously mentioned pattern and substitution expression, if you have
093:         * an input of <pre><b>Tank b123: 85  Tank b256: 32  Tank b78: 22</b></pre>
094:         * and use a <b> numInterpolations </b> value of <b>INTERPOLATE_ALL</b> and
095:         * <b> numSubs </b> value (see
096:         * {@link Util#substitute Util.substitute})
097:         * of <b> SUBSTITUTE_ALL</b>, then your result  will be:
098:         * <pre><b>Tank a123- 85  Tank a256- 32  Tank a78- 22</b></pre>
099:         * But if you set <b> numInterpolations </b> to 2 and keep 
100:         * <b> numSubs </b> with a value of <b>SUBSTITUTE_ALL</b>, your result is:
101:         * <pre><b>Tank a123- 85  Tank a256- 32  Tank a256- 22</b></pre>
102:         * Notice how the last substitution uses the same value for <b>$1</b>
103:         * as the second substitution.
104:         * </ul>
105:         * <p>
106:         * A final thing to keep in mind is that if you use an interpolation variable
107:         * that corresponds to a group not contained in the match, then it is
108:         * interpreted as the empty string.  So given the regular expression from the
109:         * example, and a substitution expression of <b>a$2-</b>, the result
110:         * of the last sample input would be:
111:         * <pre><b>Tank a- 85  Tank a- 32  Tank a- 22</b></pre>
112:         * The special substitution <b>$&</b> will interpolate the entire portion
113:         * of the input matched by the regular expression.  <b>$0</b> will
114:         * do the same, but it is recommended that it be avoided because the
115:         * latest versions of Perl use <b>$0</b> to store the program name rather
116:         * than duplicate the behavior of <b>$&</b>.
117:         * Also, the result of substituting $ followed by a non-positive integer
118:         * is undefined.  In order to include a $ in a  substitution, it should
119:         * be escaped with a backslash (e.g., <b>"\\$0"</b>).
120:         * <p>
121:         * Perl5 double-quoted string case modification is also supported in
122:         * the substitution.  The following escape sequences are supported:
123:         * <dl compact>
124:         *  <dt> \\U <dd> make substitution uppercase until end of substitution or \\E
125:         *  <dt> \\u <dd> make next character uppercase
126: *  <dt> \\L <dd> make substitution uppercase until end of substitution or \\E
127: *  <dt> \\l <dd> make next character uppercase
128: *  <dt> \\E <dd> mark the end of the case modification
129: * </dl>
130: * The double backslashes are shown to remind you that to make a
131: * backslash get past Java's string handling and appear as a backslash
132: * to the substitution, you must escape the backslash.
133: *
134: * @version @version@
135: * @since 1.1
136: * @see Substitution
137: * @see Util
138: * @see Util#substitute
139: * @see Substitution
140: * @see StringSubstitution
141: */
142:        public class Perl5Substitution extends StringSubstitution {
143:            /**
144:             * A constant used when creating a Perl5Substitution indicating that
145:             * interpolation variables should be computed relative to the most
146:             * recent pattern match.
147:             */
148:            public static final int INTERPOLATE_ALL = 0;
149:
150:            /**
151:             * A constant used when creating a Perl5Substitution indicating that 
152:             * interpolation variables should be interpreted literally, effectively 
153:             * disabling interpolation.
154:             */
155:            public static final int INTERPOLATE_NONE = -1;
156:
157:            /**
158:             * The initial size and unit of growth for the
159:             * {@link #_subOpCodes _subOpCodes} array.
160:             */
161:            private static final int __OPCODE_STORAGE_SIZE = 32;
162:
163:            /**
164:             * The maximum number of groups supported by interpolation.
165:             */
166:            private static final int __MAX_GROUPS = Character.MAX_VALUE;
167:
168:            /**
169:             * A constant declaring opcode for copy operation.
170:             */
171:            static final int _OPCODE_COPY = -1;
172:
173:            /**
174:             * A constant declaring opcode for lowercase char operation.
175:             */
176:            static final int _OPCODE_LOWERCASE_CHAR = -2;
177:
178:            /**
179:             * A constant declaring opcode for uppercase char operation.
180:             */
181:            static final int _OPCODE_UPPERCASE_CHAR = -3;
182:
183:            /**
184:             * A constant declaring opcode for lowercase mode operation.
185:             */
186:            static final int _OPCODE_LOWERCASE_MODE = -4;
187:
188:            /**
189:             * A constant declaring opcode for lowercase mode operation.
190:             */
191:            static final int _OPCODE_UPPERCASE_MODE = -5;
192:
193:            /**
194:             * A constant declaring opcode for lowercase mode operation.
195:             */
196:            static final int _OPCODE_ENDCASE_MODE = -6;
197:
198:            int _numInterpolations;
199:            int[] _subOpcodes;
200:            int _subOpcodesCount;
201:            char[] _substitutionChars;
202:
203:            transient String _lastInterpolation;
204:
205:            private static final boolean __isInterpolationCharacter(char ch) {
206:                return (Character.isDigit(ch) || ch == '&');
207:            }
208:
209:            private void __addElement(int value) {
210:                int len = _subOpcodes.length;
211:                if (_subOpcodesCount == len) {
212:                    int[] newarray = new int[len + __OPCODE_STORAGE_SIZE];
213:                    System.arraycopy(_subOpcodes, 0, newarray, 0, len);
214:                    _subOpcodes = newarray;
215:                }
216:                _subOpcodes[_subOpcodesCount++] = value;
217:            }
218:
219:            private void __parseSubs(String sub) {
220:                boolean saveDigits, escapeMode, caseMode;
221:                int posParam;
222:                int offset;
223:
224:                char[] subChars = _substitutionChars = sub.toCharArray();
225:                int subLength = subChars.length;
226:
227:                _subOpcodes = new int[__OPCODE_STORAGE_SIZE];
228:                _subOpcodesCount = 0;
229:
230:                posParam = 0;
231:                offset = -1;
232:                saveDigits = false;
233:                escapeMode = false;
234:                caseMode = false;
235:
236:                for (int current = 0; current < subLength; current++) {
237:                    char c = subChars[current];
238:                    char nextc;
239:                    int next = current + 1;
240:
241:                    // Save digits
242:                    if (saveDigits) {
243:                        int digit = Character.digit(c, 10);
244:
245:                        if (digit > -1) {
246:                            if (posParam <= __MAX_GROUPS) {
247:                                posParam *= 10;
248:                                posParam += digit;
249:                            }
250:                            if (next == subLength) {
251:                                __addElement(posParam);
252:                            }
253:                            continue;
254:                        } else if (c == '&') {
255:                            if (/*current > 0 &&*/subChars[current - 1] == '$') {
256:                                __addElement(0);
257:                                posParam = 0;
258:                                saveDigits = false;
259:                                continue;
260:                            }
261:                        }
262:
263:                        __addElement(posParam);
264:                        posParam = 0;
265:                        saveDigits = false;
266:                    }
267:
268:                    if ((c != '$' && c != '\\') || escapeMode) {
269:                        escapeMode = false;
270:                        if (offset < 0) {
271:                            offset = current;
272:                            __addElement(_OPCODE_COPY);
273:                            __addElement(offset);
274:                        }
275:                        if (next == subLength) {
276:                            __addElement(next - offset);
277:                        }
278:                        continue;
279:                    }
280:
281:                    if (offset >= 0) {
282:                        __addElement(current - offset);
283:                        offset = -1;
284:                    }
285:
286:                    // Only do positional and escapes if we have a next char
287:                    if (next == subLength)
288:                        continue;
289:                    nextc = subChars[next];
290:
291:                    // Positional params
292:                    if (c == '$') {
293:                        saveDigits = __isInterpolationCharacter(nextc);
294:                    } else if (c == '\\') { // Escape codes
295:                        if (nextc == 'l') {
296:                            if (!caseMode) {
297:                                __addElement(_OPCODE_LOWERCASE_CHAR);
298:                                current++;
299:                            }
300:                        } else if (nextc == 'u') {
301:                            if (!caseMode) {
302:                                __addElement(_OPCODE_UPPERCASE_CHAR);
303:                                current++;
304:                            }
305:                        } else if (nextc == 'L') {
306:                            __addElement(_OPCODE_LOWERCASE_MODE);
307:                            current++;
308:                            caseMode = true;
309:                        } else if (nextc == 'U') {
310:                            __addElement(_OPCODE_UPPERCASE_MODE);
311:                            current++;
312:                            caseMode = true;
313:                        } else if (nextc == 'E') {
314:                            __addElement(_OPCODE_ENDCASE_MODE);
315:                            current++;
316:                            caseMode = false;
317:                        } else {
318:                            escapeMode = true;
319:                        }
320:                    }
321:                }
322:            }
323:
324:            String _finalInterpolatedSub(MatchResult result) {
325:                StringBuffer buffer = new StringBuffer(10);
326:                _calcSub(buffer, result);
327:                return buffer.toString();
328:            }
329:
330:            void _calcSub(StringBuffer buffer, MatchResult result) {
331:                int size, offset, count, caseMode;
332:                char[] sub, str, match;
333:                int[] subOpcodes = _subOpcodes;
334:
335:                caseMode = 0;
336:
337:                str = _substitutionChars;
338:                match = result.group(0).toCharArray();
339:
340:                size = _subOpcodesCount;
341:
342:                for (int element = 0; element < size; element++) {
343:                    int value = subOpcodes[element];
344:
345:                    // If we have a group, set up interpolation, else
346:                    // interpret op code.
347:                    if (value >= 0 && value < result.groups()) {
348:                        int end, len;
349:                        offset = result.begin(value);
350:
351:                        if (offset < 0)
352:                            continue;
353:
354:                        end = result.end(value);
355:
356:                        if (end < 0)
357:                            continue;
358:
359:                        len = result.length();
360:
361:                        if (offset >= len || end > len || offset >= end)
362:                            continue;
363:
364:                        count = end - offset;
365:                        sub = match;
366:                    } else if (value == _OPCODE_COPY) {
367:                        element++;
368:                        if (element >= size)
369:                            continue;
370:                        offset = subOpcodes[element];
371:                        element++;
372:                        if (element >= size)
373:                            continue;
374:                        count = subOpcodes[element];
375:                        sub = str;
376:                    } else if (value == _OPCODE_LOWERCASE_CHAR
377:                            || value == _OPCODE_UPPERCASE_CHAR) {
378:                        if (caseMode != _OPCODE_LOWERCASE_MODE
379:                                && caseMode != _OPCODE_UPPERCASE_MODE)
380:                            caseMode = value;
381:                        continue;
382:                    } else if (value == _OPCODE_LOWERCASE_MODE
383:                            || value == _OPCODE_UPPERCASE_MODE) {
384:                        caseMode = value;
385:                        continue;
386:                    } else if (value == _OPCODE_ENDCASE_MODE) {
387:                        caseMode = 0;
388:                        continue;
389:                    } else
390:                        continue;
391:
392:                    // Apply modes to buf
393:                    if (caseMode == _OPCODE_LOWERCASE_CHAR) {
394:                        buffer.append(Character.toLowerCase(sub[offset++]));
395:                        buffer.append(sub, offset, --count);
396:                        caseMode = 0;
397:                    } else if (caseMode == _OPCODE_UPPERCASE_CHAR) {
398:                        buffer.append(Character.toUpperCase(sub[offset++]));
399:                        buffer.append(sub, offset, --count);
400:                        caseMode = 0;
401:                    } else if (caseMode == _OPCODE_LOWERCASE_MODE) {
402:                        for (int end = offset + count; offset < end;) {
403:                            buffer.append(Character.toLowerCase(sub[offset++]));
404:                        }
405:                    } else if (caseMode == _OPCODE_UPPERCASE_MODE) {
406:                        for (int end = offset + count; offset < end;) {
407:                            buffer.append(Character.toUpperCase(sub[offset++]));
408:                        }
409:                    } else
410:                        buffer.append(sub, offset, count);
411:
412:                }
413:            }
414:
415:            /**
416:             * Default constructor initializing substitution to a zero length
417:             * String and the number of interpolations to
418:             * {@link #INTERPOLATE_ALL}.
419:             */
420:            public Perl5Substitution() {
421:                this ("", INTERPOLATE_ALL);
422:            }
423:
424:            /**
425:             * Creates a Perl5Substitution using the specified substitution
426:             * and setting the number of interpolations to
427:             * {@link #INTERPOLATE_ALL}.
428:             * <p>
429:             * @param substitution The string to use as a substitution.
430:             */
431:            public Perl5Substitution(String substitution) {
432:                this (substitution, INTERPOLATE_ALL);
433:            }
434:
435:            /**
436:             * Creates a Perl5Substitution using the specified substitution
437:             * and setting the number of interpolations to the specified value.
438:             * <p>
439:             * @param substitution The string to use as a substitution.
440:             * @param numInterpolations 
441:             *            If set to <b>INTERPOLATE_NONE</b>, interpolation variables are
442:             *            interpreted literally and not as references to the saved
443:             *            parenthesized groups of a pattern match.  If set to
444:             *            <b> INTERPOLATE_ALL </b>, all variable interpolations
445:             *            are computed relative to the pattern match responsible for
446:             *            the current substitution.  If set to a positive integer,
447:             *            the first <b> numInterpolations </b> substitutions have
448:             *            their variable interpolation performed relative to the
449:             *            most recent match, but the remaining substitutions have
450:             *            their variable interpolations performed relative to the
451:             *            <b> numInterpolations </b>'th match.
452:             */
453:            public Perl5Substitution(String substitution, int numInterpolations) {
454:                setSubstitution(substitution, numInterpolations);
455:            }
456:
457:            /**
458:             * Sets the substitution represented by this Perl5Substitution, also
459:             * setting the number of interpolations to
460:             * {@link #INTERPOLATE_ALL}.
461:             * You should use this method in order to avoid repeatedly allocating new
462:             * Perl5Substitutions.  It is recommended that you allocate a single
463:             * Perl5Substitution and reuse it by using this method when appropriate.
464:             * <p>
465:             * @param substitution The string to use as a substitution.
466:             */
467:            public void setSubstitution(String substitution) {
468:                setSubstitution(substitution, INTERPOLATE_ALL);
469:            }
470:
471:            /**
472:             * Sets the substitution represented by this Perl5Substitution, also
473:             * setting the number of interpolations to the specified value.
474:             * You should use this method in order to avoid repeatedly allocating new
475:             * Perl5Substitutions.  It is recommended that you allocate a single
476:             * Perl5Substitution and reuse it by using this method when appropriate.
477:             * <p>
478:             * @param substitution The string to use as a substitution.
479:             * @param numInterpolations 
480:             *            If set to <b>INTERPOLATE_NONE</b>, interpolation variables are
481:             *            interpreted literally and not as references to the saved
482:             *            parenthesized groups of a pattern match.  If set to
483:             *            <b> INTERPOLATE_ALL </b>, all variable interpolations
484:             *            are computed relative to the pattern match responsible for
485:             *            the current substitution.  If set to a positive integer,
486:             *            the first <b> numInterpolations </b> substitutions have
487:             *            their variable interpolation performed relative to the
488:             *            most recent match, but the remaining substitutions have
489:             *            their variable interpolations performed relative to the
490:             *            <b> numInterpolations </b>'th match.
491:             */
492:            public void setSubstitution(String substitution,
493:                    int numInterpolations) {
494:                super .setSubstitution(substitution);
495:                _numInterpolations = numInterpolations;
496:
497:                if (numInterpolations != INTERPOLATE_NONE
498:                        && (substitution.indexOf('$') != -1 || substitution
499:                                .indexOf('\\') != -1))
500:                    __parseSubs(substitution);
501:                else
502:                    _subOpcodes = null;
503:                _lastInterpolation = null;
504:            }
505:
506:            /**
507:             * Appends the substitution to a buffer containing the original input
508:             * with substitutions applied for the pattern matches found so far.
509:             * See 
510:             * {@link Substitution#appendSubstitution Substitution.appendSubstition()}
511:             * for more details regarding the expected behavior of this method.
512:             * <p>
513:             * @param appendBuffer The buffer containing the new string resulting
514:             * from performing substitutions on the original input.
515:             * @param match The current match causing a substitution to be made. 
516:             * @param substitutionCount  The number of substitutions that have been
517:             *  performed so far by Util.substitute.
518:             * @param originalInput The original input upon which the substitutions are
519:             * being performed.  This is a read-only parameter and is not modified.
520:             * @param matcher The PatternMatcher used to find the current match.
521:             * @param pattern The Pattern used to find the current match.
522:             */
523:            public void appendSubstitution(StringBuffer appendBuffer,
524:                    MatchResult match, int substitutionCount,
525:                    PatternMatcherInput originalInput, PatternMatcher matcher,
526:                    Pattern pattern) {
527:                if (_subOpcodes == null) {
528:                    super .appendSubstitution(appendBuffer, match,
529:                            substitutionCount, originalInput, matcher, pattern);
530:                    return;
531:                }
532:
533:                if (_numInterpolations < 1
534:                        || substitutionCount < _numInterpolations)
535:                    _calcSub(appendBuffer, match);
536:                else {
537:                    if (substitutionCount == _numInterpolations)
538:                        _lastInterpolation = _finalInterpolatedSub(match);
539:                    appendBuffer.append(_lastInterpolation);
540:                }
541:            }
542:
543:        }
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