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1 /* |
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2 * Copyright 2008-2009 Sun Microsystems, Inc. All Rights Reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Sun designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Sun in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
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22 * CA 95054 USA or visit www.sun.com if you need additional information or |
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23 * have any questions. |
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24 */ |
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25 |
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26 package sun.nio.fs; |
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27 |
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28 import java.util.regex.PatternSyntaxException; |
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29 |
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30 public class Globs { |
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31 private Globs() { } |
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32 |
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33 private static final String regexMetaChars = ".^$+{[]|()"; |
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34 private static final String globMetaChars = "\\*?[{"; |
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35 |
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36 private static boolean isRegexMeta(char c) { |
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37 return regexMetaChars.indexOf(c) != -1; |
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38 } |
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39 |
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40 private static boolean isGlobMeta(char c) { |
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41 return globMetaChars.indexOf(c) != -1; |
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42 } |
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43 private static char EOL = 0; //TBD |
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44 |
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45 private static char next(String glob, int i) { |
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46 if (i < glob.length()) { |
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47 return glob.charAt(i); |
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48 } |
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49 return EOL; |
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50 } |
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51 |
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52 /** |
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53 * Creates a regex pattern from the given glob expression. |
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54 * |
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55 * @throws PatternSyntaxException |
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56 */ |
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57 private static String toRegexPattern(String globPattern, boolean isDos) { |
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58 boolean inGroup = false; |
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59 StringBuilder regex = new StringBuilder("^"); |
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60 |
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61 int i = 0; |
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62 while (i < globPattern.length()) { |
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63 char c = globPattern.charAt(i++); |
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64 switch (c) { |
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65 case '\\': |
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66 // escape special characters |
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67 if (i == globPattern.length()) { |
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68 throw new PatternSyntaxException("No character to escape", |
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69 globPattern, i - 1); |
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70 } |
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71 char next = globPattern.charAt(i++); |
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72 if (isGlobMeta(next) || isRegexMeta(next)) { |
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73 regex.append('\\'); |
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74 } |
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75 regex.append(next); |
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76 break; |
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77 case '/': |
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78 if (isDos) { |
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79 regex.append("\\\\"); |
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80 } else { |
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81 regex.append(c); |
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82 } |
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83 break; |
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84 case '[': |
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85 // don't match name separator in class |
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86 if (isDos) { |
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87 regex.append("[[^\\\\]&&["); |
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88 } else { |
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89 regex.append("[[^/]&&["); |
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90 } |
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91 if (next(globPattern, i) == '^') { |
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92 // escape the regex negation char if it appears |
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93 regex.append("\\^"); |
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94 i++; |
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95 } else { |
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96 // negation |
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97 if (next(globPattern, i) == '!') { |
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98 regex.append('^'); |
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99 i++; |
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100 } |
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101 // hyphen allowed at start |
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102 if (next(globPattern, i) == '-') { |
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103 regex.append('-'); |
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104 i++; |
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105 } |
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106 } |
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107 boolean hasRangeStart = false; |
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108 char last = 0; |
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109 while (i < globPattern.length()) { |
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110 c = globPattern.charAt(i++); |
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111 if (c == ']') { |
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112 break; |
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113 } |
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114 if (c == '/' || (isDos && c == '\\')) { |
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115 throw new PatternSyntaxException("Explicit 'name separator' in class", |
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116 globPattern, i - 1); |
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117 } |
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118 // TBD: how to specify ']' in a class? |
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119 if (c == '\\' || c == '[' || |
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120 c == '&' && next(globPattern, i) == '&') { |
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121 // escape '\', '[' or "&&" for regex class |
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122 regex.append('\\'); |
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123 } |
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124 regex.append(c); |
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125 |
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126 if (c == '-') { |
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127 if (!hasRangeStart) { |
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128 throw new PatternSyntaxException("Invalid range", |
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129 globPattern, i - 1); |
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130 } |
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131 if ((c = next(globPattern, i++)) == EOL || c == ']') { |
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132 break; |
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133 } |
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134 if (c < last) { |
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135 throw new PatternSyntaxException("Invalid range", |
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136 globPattern, i - 3); |
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137 } |
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138 regex.append(c); |
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139 hasRangeStart = false; |
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140 } else { |
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141 hasRangeStart = true; |
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142 last = c; |
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143 } |
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144 } |
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145 if (c != ']') { |
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146 throw new PatternSyntaxException("Missing ']", globPattern, i - 1); |
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147 } |
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148 regex.append("]]"); |
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149 break; |
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150 case '{': |
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151 if (inGroup) { |
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152 throw new PatternSyntaxException("Cannot nest groups", |
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153 globPattern, i - 1); |
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154 } |
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155 regex.append("(?:(?:"); |
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156 inGroup = true; |
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157 break; |
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158 case '}': |
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159 if (inGroup) { |
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160 regex.append("))"); |
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161 inGroup = false; |
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162 } else { |
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163 regex.append('}'); |
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164 } |
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165 break; |
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166 case ',': |
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167 if (inGroup) { |
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168 regex.append(")|(?:"); |
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169 } else { |
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170 regex.append(','); |
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171 } |
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172 break; |
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173 case '*': |
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174 if (next(globPattern, i) == '*') { |
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175 // crosses directory boundaries |
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176 regex.append(".*"); |
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177 i++; |
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178 } else { |
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179 // within directory boundary |
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180 if (isDos) { |
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181 regex.append("[^\\\\]*"); |
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182 } else { |
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183 regex.append("[^/]*"); |
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184 } |
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185 } |
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186 break; |
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187 case '?': |
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188 if (isDos) { |
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189 regex.append("[^\\\\]"); |
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190 } else { |
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191 regex.append("[^/]"); |
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192 } |
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193 break; |
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194 |
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195 default: |
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196 if (isRegexMeta(c)) { |
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197 regex.append('\\'); |
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198 } |
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199 regex.append(c); |
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200 } |
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201 } |
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202 |
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203 if (inGroup) { |
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204 throw new PatternSyntaxException("Missing '}", globPattern, i - 1); |
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205 } |
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206 |
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207 return regex.append('$').toString(); |
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208 } |
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209 |
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210 static String toUnixRegexPattern(String globPattern) { |
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211 return toRegexPattern(globPattern, false); |
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212 } |
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213 |
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214 static String toWindowsRegexPattern(String globPattern) { |
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215 return toRegexPattern(globPattern, true); |
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216 } |
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217 } |