1 | /*
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2 | * Copyright 2000-2004 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.regexp;
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19 |
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20 | import java.util.Vector;
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21 | import org.apache.regexp.RE;
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22 | import org.apache.regexp.RESyntaxException;
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23 | import org.apache.tools.ant.BuildException;
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24 |
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25 | /**
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26 | * Implementation of RegexpMatcher for Jakarta-Regexp.
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27 | *
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28 | */
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29 | public class JakartaRegexpMatcher implements RegexpMatcher {
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30 |
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31 | private String pattern;
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32 |
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33 | /**
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34 | * Set the regexp pattern from the String description.
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35 | * @param pattern the pattern to match
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36 | */
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37 | public void setPattern(String pattern) {
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38 | this.pattern = pattern;
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39 | }
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40 |
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41 | /**
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42 | * Get a String representation of the regexp pattern
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43 | * @return the pattern
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44 | */
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45 | public String getPattern() {
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46 | return pattern;
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47 | }
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48 |
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49 | /**
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50 | * Compile the pattern.
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51 | *
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52 | * @param options the ant regexp options
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53 | * @return a compiled pattern
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54 | * @exception BuildException if an error occurs
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55 | */
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56 | protected RE getCompiledPattern(int options)
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57 | throws BuildException {
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58 | int cOptions = getCompilerOptions(options);
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59 | try {
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60 | RE reg = new RE(pattern);
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61 | reg.setMatchFlags(cOptions);
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62 | return reg;
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63 | } catch (RESyntaxException e) {
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64 | throw new BuildException(e);
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65 | }
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66 | }
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67 |
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68 | /**
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69 | * Does the given argument match the pattern?
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70 | * @param argument the string to match against
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71 | * @return true if the pattern matches
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72 | * @throws BuildException on error
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73 | */
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74 | public boolean matches(String argument) throws BuildException {
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75 | return matches(argument, MATCH_DEFAULT);
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76 | }
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77 |
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78 | /**
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79 | * Does the given argument match the pattern?
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80 | * @param input the string to match against
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81 | * @param options the regex options to use
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82 | * @return true if the pattern matches
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83 | * @throws BuildException on error
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84 | */
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85 | public boolean matches(String input, int options)
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86 | throws BuildException {
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87 | return matches(input, getCompiledPattern(options));
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88 | }
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89 |
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90 | private boolean matches(String input, RE reg) {
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91 | return reg.match(input);
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92 | }
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93 |
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94 | /**
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95 | * Returns a Vector of matched groups found in the argument
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96 | * using default options.
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97 | *
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98 | * <p>Group 0 will be the full match, the rest are the
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99 | * parenthesized subexpressions</p>.
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100 | *
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101 | * @param argument the string to match against
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102 | * @return the vector of groups
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103 | * @throws BuildException on error
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104 | */
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105 | public Vector getGroups(String argument) throws BuildException {
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106 | return getGroups(argument, MATCH_DEFAULT);
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107 | }
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108 |
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109 | /**
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110 | * Returns a Vector of matched groups found in the argument.
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111 | *
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112 | * <p>Group 0 will be the full match, the rest are the
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113 | * parenthesized subexpressions</p>.
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114 | *
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115 | * @param input the string to match against
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116 | * @param options the regex options to use
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117 | * @return the vector of groups
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118 | * @throws BuildException on error
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119 | */
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120 | public Vector getGroups(String input, int options)
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121 | throws BuildException {
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122 | RE reg = getCompiledPattern(options);
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123 | if (!matches(input, reg)) {
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124 | return null;
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125 | }
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126 | Vector v = new Vector();
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127 | int cnt = reg.getParenCount();
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128 | for (int i = 0; i < cnt; i++) {
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129 | String match = reg.getParen(i);
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130 | // treat non-matching groups as empty matches
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131 | if (match == null) {
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132 | match = "";
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133 | }
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134 | v.addElement(match);
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135 | }
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136 | return v;
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137 | }
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138 |
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139 | /**
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140 | * Convert the generic options to the regex compiler specific options.
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141 | * @param options the generic options
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142 | * @return the specific options
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143 | */
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144 | protected int getCompilerOptions(int options) {
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145 | int cOptions = RE.MATCH_NORMAL;
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146 |
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147 | if (RegexpUtil.hasFlag(options, MATCH_CASE_INSENSITIVE)) {
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148 | cOptions |= RE.MATCH_CASEINDEPENDENT;
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149 | }
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150 | if (RegexpUtil.hasFlag(options, MATCH_MULTILINE)) {
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151 | cOptions |= RE.MATCH_MULTILINE;
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152 | }
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153 | if (RegexpUtil.hasFlag(options, MATCH_SINGLELINE)) {
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154 | cOptions |= RE.MATCH_SINGLELINE;
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155 | }
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156 |
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157 | return cOptions;
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158 | }
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159 |
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160 | }
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