1 | /*
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2 | * Copyright 2000,2002-2005 The Apache Software Foundation
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3 | *
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4 | * Licensed under the Apache License, Version 2.0 (the "License");
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5 | * you may not use this file except in compliance with the License.
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6 | * You may obtain a copy of the License at
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7 | *
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8 | * http://www.apache.org/licenses/LICENSE-2.0
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9 | *
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10 | * Unless required by applicable law or agreed to in writing, software
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11 | * distributed under the License is distributed on an "AS IS" BASIS,
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12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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13 | * See the License for the specific language governing permissions and
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14 | * limitations under the License.
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15 | *
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16 | */
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17 |
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18 | package org.apache.tools.ant.util;
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19 |
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20 | import java.util.Vector;
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21 | import org.apache.tools.ant.BuildException;
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22 | import org.apache.tools.ant.util.regexp.RegexpMatcher;
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23 | import org.apache.tools.ant.util.regexp.RegexpMatcherFactory;
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24 |
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25 | /**
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26 | * Implementation of FileNameMapper that does regular expression
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27 | * replacements.
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28 | *
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29 | */
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30 | public class RegexpPatternMapper implements FileNameMapper {
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31 | protected RegexpMatcher reg = null;
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32 | protected char[] to = null;
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33 | protected StringBuffer result = new StringBuffer();
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34 |
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35 | /**
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36 | * Constructor for RegexpPatternMapper.
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37 | * @throws BuildException on error.
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38 | */
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39 | public RegexpPatternMapper() throws BuildException {
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40 | reg = (new RegexpMatcherFactory()).newRegexpMatcher();
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41 | }
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42 |
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43 | private boolean handleDirSep = false;
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44 | private int regexpOptions = 0;
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45 |
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46 | /**
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47 | * Attribute specifing whether to ignore the difference
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48 | * between / and \ (the two common directory characters).
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49 | * @param handleDirSep a boolean, default is false.
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50 | * @since Ant 1.6.3
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51 | */
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52 | public void setHandleDirSep(boolean handleDirSep) {
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53 | this.handleDirSep = handleDirSep;
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54 | }
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55 |
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56 | /**
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57 | * Attribute specifing whether to ignore the case difference
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58 | * in the names.
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59 | *
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60 | * @param caseSensitive a boolean, default is false.
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61 | * @since Ant 1.6.3
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62 | */
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63 | public void setCaseSensitive(boolean caseSensitive) {
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64 | if (!caseSensitive) {
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65 | regexpOptions = RegexpMatcher.MATCH_CASE_INSENSITIVE;
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66 | } else {
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67 | regexpOptions = 0;
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68 | }
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69 | }
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70 |
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71 | /**
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72 | * Sets the "from" pattern. Required.
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73 | * @param from the from pattern.
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74 | * @throws BuildException on error.
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75 | */
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76 | public void setFrom(String from) throws BuildException {
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77 | try {
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78 | reg.setPattern(from);
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79 | } catch (NoClassDefFoundError e) {
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80 | // depending on the implementation the actual RE won't
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81 | // get instantiated in the constructor.
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82 | throw new BuildException("Cannot load regular expression matcher",
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83 | e);
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84 | }
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85 | }
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86 |
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87 | /**
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88 | * Sets the "to" pattern. Required.
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89 | * @param to the to pattern.
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90 | * @throws BuildException on error.
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91 | */
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92 | public void setTo(String to) {
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93 | this.to = to.toCharArray();
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94 | }
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95 |
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96 | /**
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97 | * Returns null if the source file name doesn't match the
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98 | * "from" pattern, an one-element array containing the
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99 | * translated file otherwise.
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100 | * @param sourceFileName the source file name
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101 | * @return a one-element array containing the translated file or
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102 | * null if the to pattern did not match
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103 | */
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104 | public String[] mapFileName(String sourceFileName) {
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105 | if (handleDirSep) {
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106 | if (sourceFileName.indexOf("\\") != -1) {
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107 | sourceFileName = sourceFileName.replace('\\', '/');
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108 | }
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109 | }
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110 | if (reg == null || to == null
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111 | || !reg.matches(sourceFileName, regexpOptions)) {
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112 | return null;
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113 | }
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114 | return new String[] {replaceReferences(sourceFileName)};
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115 | }
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116 |
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117 | /**
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118 | * Replace all backreferences in the to pattern with the matched
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119 | * groups of the source.
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120 | * @param source the source file name.
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121 | * @return the translated file name.
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122 | */
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123 | protected String replaceReferences(String source) {
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124 | Vector v = reg.getGroups(source, regexpOptions);
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125 |
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126 | result.setLength(0);
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127 | for (int i = 0; i < to.length; i++) {
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128 | if (to[i] == '\\') {
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129 | if (++i < to.length) {
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130 | int value = Character.digit(to[i], 10);
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131 | if (value > -1) {
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132 | result.append((String) v.elementAt(value));
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133 | } else {
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134 | result.append(to[i]);
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135 | }
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136 | } else {
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137 | // XXX - should throw an exception instead?
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138 | result.append('\\');
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139 | }
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140 | } else {
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141 | result.append(to[i]);
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142 | }
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143 | }
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144 | return result.substring(0);
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145 | }
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146 |
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147 | }
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