Source Code Cross Referenced for Perl5MatchResult.java in  » Development » Jakarta-ORO » org » apache » oro » text » regex » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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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: Perl5MatchResult.java,v 1.8 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:        /**
061:         * A class used to store and access the results of a Perl5Pattern match.
062:         *
063:         * @version @version@
064:         * @since 1.0
065:         * @see PatternMatcher
066:         * @see Perl5Matcher
067:         */
068:        final class Perl5MatchResult implements  MatchResult {
069:            /**
070:             * The character offset into the line or stream where the match
071:             * begins.  Pattern matching methods that look for matches a line at
072:             * a time should use this field as the offset into the line
073:             * of the match.  Methods that look for matches independent of line
074:             * boundaries should use this field as the offset into the entire
075:             * text stream.
076:             */
077:            int _matchBeginOffset;
078:
079:            /**
080:             * Arrays containing the beginning and end offsets of the pattern
081:             * groups matched within the actual matched pattern contained in the 
082:             * variable <code>match</code>.
083:             * Pattern matching methods that do not match subgroups, will only contain
084:             * entries for group 0, which always refers to the entire pattern.
085:             * <code>beginGroupOffset</code> contains the start offset of the groups,
086:             * indexed by group number, which will always be 0 for group 0.
087:             * <code>endGroupOffset</code> contains the ending offset + 1 of the groups.
088:             * A group matching the null string will have  <code>beginGroupOffset</code>
089:             * and <code>endGroupOffset</code> entries of equal value.  Following a
090:             * convention established by the GNU regular expression library for the
091:             * C language, groups that are not part of a match contain -1 as their
092:             * begin and end offsets.
093:             */
094:            int[] _beginGroupOffset, _endGroupOffset;
095:
096:            /**
097:             * The entire string that matched the pattern.
098:             */
099:            String _match;
100:
101:            /**
102:             * Constructs a MatchResult able to store match information for
103:             * a number of subpattern groups.
104:             * <p>
105:             * @param groups  The number of groups this MatchResult can store.
106:             *        Only postitive values greater than or equal to 1 make any
107:             *        sense.  At minimum, a MatchResult stores one group which
108:             *        represents the entire pattern matched including all subparts.
109:             */
110:            Perl5MatchResult(int groups) {
111:                _beginGroupOffset = new int[groups];
112:                _endGroupOffset = new int[groups];
113:            }
114:
115:            /**
116:             * @return The length of the match.
117:             */
118:            public int length() {
119:                int length;
120:
121:                length = (_endGroupOffset[0] - _beginGroupOffset[0]);
122:
123:                return (length > 0 ? length : 0);
124:            }
125:
126:            /**
127:             * @return The number of groups contained in the result.  This number
128:             *         includes the 0th group.  In other words, the result refers
129:             *         to the number of parenthesized subgroups plus the entire match
130:             *         itself.
131:             */
132:            public int groups() {
133:                return _beginGroupOffset.length;
134:            }
135:
136:            /**
137:             * @param group The pattern subgroup to return.
138:             * @return A string containing the indicated pattern subgroup.  Group
139:             *         0 always refers to the entire match.  If a group was never
140:             *         matched, it returns null.  This is not to be confused with
141:             *         a group matching the null string, which will return a String
142:             *         of length 0.
143:             */
144:            public String group(int group) {
145:                int begin, end, length;
146:
147:                if (group < _beginGroupOffset.length) {
148:                    begin = _beginGroupOffset[group];
149:                    end = _endGroupOffset[group];
150:                    length = _match.length();
151:
152:                    if (begin >= 0 && end >= 0) {
153:                        if (begin < length && end <= length && end > begin)
154:                            return _match.substring(begin, end);
155:                        else if (begin <= end)
156:                            return "";
157:                    }
158:                }
159:
160:                return null;
161:            }
162:
163:            /**
164:             * @param group The pattern subgroup.
165:             * @return The offset into group 0 of the first token in the indicated
166:             *         pattern subgroup.  If a group was never matched or does
167:             *         not exist, returns -1.
168:             */
169:            public int begin(int group) {
170:                int begin, end;//, length;
171:                if (group < _beginGroupOffset.length) {
172:                    begin = _beginGroupOffset[group];
173:                    end = _endGroupOffset[group];
174:                    //length = _match.length();
175:                    if (begin >= 0 && end >= 0)// && begin < length && end <= length)
176:                        //return _beginGroupOffset[group];
177:                        return begin;
178:                }
179:
180:                return -1;
181:            }
182:
183:            /**
184:             * @param group The pattern subgroup.
185:             * @return Returns one plus the offset into group 0 of the last token in
186:             *         the indicated pattern subgroup.  If a group was never matched
187:             *         or does not exist, returns -1.  A group matching the null
188:             *         string will return its start offset.
189:             */
190:            public int end(int group) {
191:                int begin, end; //, length;
192:                if (group < _beginGroupOffset.length) {
193:                    begin = _beginGroupOffset[group];
194:                    end = _endGroupOffset[group];
195:                    //length = _match.length();
196:                    if (begin >= 0 && end >= 0)// && begin < length && end <= length)
197:                        //return _endGroupOffset[group];
198:                        return end;
199:                }
200:                return -1;
201:            }
202:
203:            /**
204:             * Returns an offset marking the beginning of the pattern match
205:             * relative to the beginning of the input.
206:             * <p>
207:             * @param group The pattern subgroup.
208:             * @return The offset of the first token in the indicated
209:             *         pattern subgroup.  If a group was never matched or does
210:             *         not exist, returns -1.
211:             */
212:            public int beginOffset(int group) {
213:                int begin, end;//, length;
214:                if (group < _beginGroupOffset.length) {
215:                    begin = _beginGroupOffset[group];
216:                    end = _endGroupOffset[group];
217:                    //length = _match.length();
218:                    if (begin >= 0 && end >= 0)// && begin < length && end <= length)
219:                        //return _matchBeginOffset + _beginGroupOffset[group];
220:                        return _matchBeginOffset + begin;
221:                }
222:                return -1;
223:            }
224:
225:            /**
226:             * Returns an offset marking the end of the pattern match 
227:             * relative to the beginning of the input.
228:             * <p>
229:             * @param group The pattern subgroup.
230:             * @return Returns one plus the offset of the last token in
231:             *         the indicated pattern subgroup.  If a group was never matched
232:             *         or does not exist, returns -1.  A group matching the null
233:             *         string will return its start offset.
234:             */
235:            public int endOffset(int group) {
236:                int begin, end;//, length;
237:                if (group < _endGroupOffset.length) {
238:                    begin = _beginGroupOffset[group];
239:                    end = _endGroupOffset[group];
240:                    //length = _match.length();
241:                    if (begin >= 0 && end >= 0)// && begin < length && end <= length)
242:                        //return _matchBeginOffset + _endGroupOffset[group];
243:                        return _matchBeginOffset + end;
244:                }
245:                return -1;
246:            }
247:
248:            /**
249:             * The same as group(0).
250:             *
251:             * @return A string containing the entire match.
252:             */
253:            public String toString() {
254:                return group(0);
255:            }
256:        }
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