Source Code Cross Referenced for PerlSubstitution.java in  » Scripting » jruby » jregex » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Scripting » jruby » jregex 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /**
002:         * Copyright (c) 2001, Sergey A. Samokhodkin
003:         * All rights reserved.
004:         * 
005:         * Redistribution and use in source and binary forms, with or without modification, 
006:         * are permitted provided that the following conditions are met:
007:         * 
008:         * - Redistributions of source code must retain the above copyright notice, 
009:         * this list of conditions and the following disclaimer. 
010:         * - Redistributions in binary form 
011:         * must reproduce the above copyright notice, this list of conditions and the following 
012:         * disclaimer in the documentation and/or other materials provided with the distribution.
013:         * - Neither the name of jregex nor the names of its contributors may be used 
014:         * to endorse or promote products derived from this software without specific prior 
015:         * written permission. 
016:         * 
017:         * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY 
018:         * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 
019:         * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
020:         * IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
021:         * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
022:         * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 
023:         * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
024:         * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY 
025:         * WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
026:         * 
027:         * @version 1.2_01
028:         */package jregex;
029:
030:        import java.io.*;
031:        import java.util.Hashtable;
032:        import java.util.Vector;
033:
034:        /**
035:         * An implementation of the Substitution interface. Performs substitutions in accordance with Perl-like substitution scripts.<br>
036:         * The latter is a string, containing a mix of memory register references and plain text blocks.<br>
037:         * It may look like "some_chars $1 some_chars$2some_chars" or "123${1}45${2}67".<br>
038:         * A tag consisting of '$',not preceeded by the escape character'\' and  followed by some digits (possibly enclosed in the curled brackets) is interpreted as a memory register reference, the digits forming a register ID.
039:         * All the rest is considered as a plain text.<br>
040:         * Upon the Replacer has found a text block that matches the pattern, a references in a replacement string are replaced by the contents of 
041:         * corresponding memory registers, and the resulting text replaces the matched block.<br>
042:         * For example, the following code:
043:         * <pre>
044:         * System.out.println("\""+
045:         *    new Replacer(new Pattern("\\b(\\d+)\\b"),new PerlSubstitution("'$1'")).replace("abc 123 def")
046:         *    +"\"");
047:         * </pre>
048:         * will print <code>"abc '123' def"</code>.<br>
049:         * @see        Substitution
050:         * @see        Replacer
051:         * @see        Pattern
052:         */
053:
054:        public class PerlSubstitution implements  Substitution {
055:            //private static Pattern refPtn,argsPtn;
056:            private static Pattern refPtn;
057:            private static int NAME_ID;
058:            private static int ESC_ID;
059:            //private static int FN_NAME_ID;
060:            //private static int FN_ARGS_ID;
061:            //private static int ARG_NAME_ID;
062:
063:            private static final String groupRef = "\\$(?:\\{({=name}\\w+)\\}|({=name}\\d+|&))|\\\\({esc}.)";
064:            //private static final String fnRef="\\&({fn_name}\\w+)\\(({fn_args}"+groupRef+"(?:,"+groupRef+")*)*\\)";
065:
066:            static {
067:                try {
068:                    //refPtn=new Pattern("(?<!\\\\)"+fnRef+"|"+groupRef);
069:                    //argsPtn=new Pattern(groupRef);
070:                    //refPtn=new Pattern("(?<!\\\\)"+groupRef);
071:                    refPtn = new Pattern(groupRef);
072:                    NAME_ID = refPtn.groupId("name").intValue();
073:                    ESC_ID = refPtn.groupId("esc").intValue();
074:                    //ARG_NAME_ID=argsPtn.groupId("name").intValue();
075:                    //FN_NAME_ID=refPtn.groupId("fn_name").intValue();
076:                    //FN_ARGS_ID=refPtn.groupId("fn_args").intValue();
077:                } catch (PatternSyntaxException e) {
078:                    e.printStackTrace();
079:                }
080:            }
081:
082:            private Element queueEntry;
083:
084:            //It seems we should somehow throw an IllegalArgumentException if an expression 
085:            //holds a reference to a non-existing group. Such checking will require a Pattern instance.
086:            public PerlSubstitution(String s) {
087:                Matcher refMatcher = new Matcher(refPtn);
088:                refMatcher.setTarget(s);
089:                queueEntry = makeQueue(refMatcher);
090:            }
091:
092:            public String value(MatchResult mr) {
093:                TextBuffer dest = Replacer.wrap(new StringBuffer(mr.length()));
094:                appendSubstitution(mr, dest);
095:                return dest.toString();
096:            }
097:
098:            private static Element makeQueue(Matcher refMatcher) {
099:                if (refMatcher.find()) {
100:                    Element element;
101:                    if (refMatcher.isCaptured(NAME_ID)) {
102:                        char c = refMatcher.charAt(0, NAME_ID);
103:                        if (c == '&') {
104:                            element = new IntRefHandler(refMatcher.prefix(),
105:                                    new Integer(0));
106:                        } else if (Character.isDigit(c)) {
107:                            element = new IntRefHandler(refMatcher.prefix(),
108:                                    new Integer(refMatcher.group(NAME_ID)));
109:                        } else
110:                            element = new StringRefHandler(refMatcher.prefix(),
111:                                    refMatcher.group(NAME_ID));
112:                    } else {
113:                        //escaped char
114:                        element = new PlainElement(refMatcher.prefix(),
115:                                refMatcher.group(ESC_ID));
116:                    }
117:                    refMatcher.setTarget(refMatcher, MatchResult.SUFFIX);
118:                    element.next = makeQueue(refMatcher);
119:                    return element;
120:                } else
121:                    return new PlainElement(refMatcher.target());
122:            }
123:
124:            public void appendSubstitution(MatchResult match, TextBuffer dest) {
125:                for (Element element = this .queueEntry; element != null; element = element.next) {
126:                    element.append(match, dest);
127:                }
128:            }
129:
130:            public String toString() {
131:                StringBuffer sb = new StringBuffer();
132:                for (Element element = this .queueEntry; element != null; element = element.next) {
133:                    sb.append(element.toString());
134:                }
135:                return sb.toString();
136:            }
137:
138:            private static abstract class Element {
139:                protected String prefix;
140:                Element next;
141:
142:                abstract void append(MatchResult match, TextBuffer dest);
143:            }
144:
145:            private static class PlainElement extends Element {
146:                private String str;
147:
148:                PlainElement(String s) {
149:                    str = s;
150:                }
151:
152:                PlainElement(String pref, String s) {
153:                    prefix = pref;
154:                    str = s;
155:                }
156:
157:                void append(MatchResult match, TextBuffer dest) {
158:                    if (prefix != null)
159:                        dest.append(prefix);
160:                    if (str != null)
161:                        dest.append(str);
162:                }
163:            }
164:
165:            private static class IntRefHandler extends Element {
166:                private Integer index;
167:
168:                IntRefHandler(String s, Integer ind) {
169:                    prefix = s;
170:                    index = ind;
171:                }
172:
173:                void append(MatchResult match, TextBuffer dest) {
174:                    if (prefix != null)
175:                        dest.append(prefix);
176:                    if (index == null)
177:                        return;
178:                    int i = index.intValue();
179:                    if (i >= match.pattern().groupCount())
180:                        return;
181:                    if (match.isCaptured(i))
182:                        match.getGroup(i, dest);
183:                }
184:            }
185:
186:            private static class StringRefHandler extends Element {
187:                private String index;
188:
189:                StringRefHandler(String s, String ind) {
190:                    prefix = s;
191:                    index = ind;
192:                }
193:
194:                void append(MatchResult match, TextBuffer dest) {
195:                    if (prefix != null)
196:                        dest.append(prefix);
197:                    if (index == null)
198:                        return;
199:                    Integer id = match.pattern().groupId(index);
200:                    //if(id==null) return; //???
201:                    int i = id.intValue();
202:                    if (match.isCaptured(i))
203:                        match.getGroup(i, dest);
204:                }
205:            }
206:        }
207:
208:        abstract class GReference {
209:            public abstract String stringValue(MatchResult match);
210:
211:            public static GReference createInstance(MatchResult match, int grp) {
212:                if (match.length(grp) == 0)
213:                    throw new IllegalArgumentException(
214:                            "arg name cannot be an empty string");
215:                if (Character.isDigit(match.charAt(0, grp))) {
216:                    try {
217:                        return new IntReference(Integer.parseInt(match
218:                                .group(grp)));
219:                    } catch (NumberFormatException e) {
220:                        throw new IllegalArgumentException(
221:                                "illegal arg name, starts with digit but is not a number");
222:                    }
223:                }
224:                return new StringReference((match.group(grp)));
225:            }
226:        }
227:
228:        class IntReference extends GReference {
229:            protected int id;
230:
231:            IntReference(int id) {
232:                this .id = id;
233:            }
234:
235:            public String stringValue(MatchResult match) {
236:                return match.group(id);
237:            }
238:        }
239:
240:        class StringReference extends GReference {
241:            protected String name;
242:
243:            StringReference(String name) {
244:                this .name = name;
245:            }
246:
247:            public String stringValue(MatchResult match) {
248:                return match.group(name);
249:            }
250:        }
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