Mercurial > hg4j
annotate src/org/tmatesoft/hg/repo/HgIgnore.java @ 386:73e875154afb
Do not fail with empty extras string in changeset
author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
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date | Mon, 13 Feb 2012 14:52:21 +0100 |
parents | 58016b1b8554 |
children | e732521a9eb4 |
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1 /* |
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2 * Copyright (c) 2010-2011 TMate Software Ltd |
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3 * |
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4 * This program is free software; you can redistribute it and/or modify |
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5 * it under the terms of the GNU General Public License as published by |
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6 * the Free Software Foundation; version 2 of the License. |
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7 * |
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8 * This program is distributed in the hope that it will be useful, |
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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11 * GNU General Public License for more details. |
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12 * |
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13 * For information on how to redistribute this software under |
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14 * the terms of a license other than GNU General Public License |
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15 * contact TMate Software at support@hg4j.com |
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16 */ |
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17 package org.tmatesoft.hg.repo; |
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18 |
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19 import java.io.BufferedReader; |
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20 import java.io.File; |
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21 import java.io.FileReader; |
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22 import java.io.IOException; |
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23 import java.util.ArrayList; |
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24 import java.util.Collections; |
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25 import java.util.List; |
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26 import java.util.regex.Pattern; |
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27 import java.util.regex.PatternSyntaxException; |
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28 |
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29 import org.tmatesoft.hg.util.Path; |
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30 |
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31 /** |
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32 * Handling of ignored paths according to .hgignore configuration |
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33 * |
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34 * @author Artem Tikhomirov |
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35 * @author TMate Software Ltd. |
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36 */ |
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37 public class HgIgnore implements Path.Matcher { |
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38 |
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39 private List<Pattern> entries; |
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40 |
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41 HgIgnore() { |
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42 entries = Collections.emptyList(); |
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43 } |
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44 |
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45 /* package-local */List<String> read(File hgignoreFile) throws IOException { |
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46 if (!hgignoreFile.exists()) { |
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47 return null; |
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48 } |
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49 BufferedReader fr = new BufferedReader(new FileReader(hgignoreFile)); |
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50 try { |
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51 return read(fr); |
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52 } finally { |
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53 fr.close(); |
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54 } |
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55 } |
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56 |
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57 /* package-local */List<String> read(BufferedReader content) throws IOException { |
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58 ArrayList<String> errors = new ArrayList<String>(); |
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59 ArrayList<Pattern> result = new ArrayList<Pattern>(entries); // start with existing |
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60 String syntax = "regexp"; // or "glob" |
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61 String line; |
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62 while ((line = content.readLine()) != null) { |
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63 line = line.trim(); |
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64 if (line.startsWith("syntax:")) { |
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65 syntax = line.substring("syntax:".length()).trim(); |
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66 if (!"regexp".equals(syntax) && !"glob".equals(syntax)) { |
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67 errors.add(line); |
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68 continue; |
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69 //throw new IllegalStateException(line); |
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70 } |
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71 } else if (line.length() > 0) { |
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72 // shall I account for local paths in the file (i.e. |
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73 // back-slashed on windows)? |
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74 int x, s = 0; |
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75 while ((x = line.indexOf('#', s)) >= 0) { |
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76 if (x > 0 && line.charAt(x-1) == '\\') { |
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77 // remove escape char |
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78 line = line.substring(0, x-1).concat(line.substring(x)); |
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79 s = x; // with exclusion of char at [x], s now points to what used to be at [x+1] |
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80 } else { |
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81 line = line.substring(0, x).trim(); |
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82 } |
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83 } |
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84 if (line.length() == 0) { |
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85 continue; |
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86 } |
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87 if ("glob".equals(syntax)) { |
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88 // hgignore(5) |
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89 // (http://www.selenic.com/mercurial/hgignore.5.html) says slashes '\' are escape characters, |
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90 // hence no special treatment of Windows path |
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91 // however, own attempts make me think '\' on Windows are not treated as escapes |
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92 line = glob2regex(line); |
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93 } else { |
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94 assert "regexp".equals(syntax); |
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95 // regular expression patterns need not match start of the line unless demanded explicitly |
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96 line = line.charAt(0) == '^' ? line : ".*" + line; |
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97 } |
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98 try { |
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99 result.add(Pattern.compile(line)); // case-sensitive |
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100 } catch (PatternSyntaxException ex) { |
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101 errors.add(line + "@" + ex.getMessage()); |
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102 } |
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103 } |
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104 } |
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105 result.trimToSize(); |
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106 entries = result; |
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107 return errors.isEmpty() ? null : errors; |
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108 } |
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109 |
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110 // note, #isIgnored(), even if queried for directories and returned positive reply, may still get |
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111 // a file from that ignored folder to get examined. Thus, patterns like "bin" shall match not only a folder, |
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112 // but any file under that folder as well |
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113 // Alternatively, file walker may memorize folder is ignored and uses this information for all nested files. However, |
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114 // this approach would require walker (a) return directories (b) provide nesting information. This may become |
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115 // troublesome when one walks not over io.File, but Eclipse's IResource or any other custom VFS. |
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116 // |
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117 // |
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118 // might be interesting, although looks like of no direct use in my case |
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119 // @see http://stackoverflow.com/questions/1247772/is-there-an-equivalent-of-java-util-regex-for-glob-type-patterns |
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120 // |
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121 // TODO consider refactoring to reuse in PathGlobMatcher#glob2regexp |
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122 private static String glob2regex(String line) { |
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123 assert line.length() > 0; |
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124 StringBuilder sb = new StringBuilder(line.length() + 10); |
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125 int start = 0, end = line.length() - 1; |
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126 sb.append("(?:|.*/)"); // glob patterns shall match file in any directory |
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127 |
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128 int inCurly = 0; |
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129 for (int i = start; i <= end; i++) { |
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130 char ch = line.charAt(i); |
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131 if (ch == '.' || ch == '\\') { |
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132 sb.append('\\'); |
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133 } else if (ch == '?') { |
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134 // simple '.' substitution might work out, however, more formally |
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135 // a char class seems more appropriate to avoid accidentally |
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136 // matching a subdirectory with ? char (i.e. /a/b?d against /a/bad, /a/bed and /a/b/d) |
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137 // @see http://pubs.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html#tag_02_13_03 |
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138 // quote: "The slash character in a pathname shall be explicitly matched by using one or more slashes in the pattern; |
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139 // it shall neither be matched by the asterisk or question-mark special characters nor by a bracket expression" |
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140 sb.append("[^/]"); |
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141 continue; |
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142 } else if (ch == '*') { |
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143 sb.append("[^/]*?"); |
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144 continue; |
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145 } else if (ch == '{') { |
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146 // XXX in fact, need to respect if last char was escaping ('\\'), then don't need to treat this as special |
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147 // see link at javadoc above for reasonable example |
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148 inCurly++; |
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149 sb.append('('); |
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150 continue; |
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151 } else if (ch == '}') { |
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152 if (inCurly > 0) { |
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153 inCurly--; |
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154 sb.append(')'); |
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155 continue; |
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156 } |
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157 } else if (ch == ',' && inCurly > 0) { |
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158 sb.append('|'); |
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159 continue; |
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160 } |
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161 sb.append(ch); |
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162 } |
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163 sb.append("(?:/|$)"); |
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164 return sb.toString(); |
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165 } |
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166 |
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167 /** |
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168 * @param path file or directory name in question |
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169 * @return <code>true</code> if matches repository configuration of ignored files. |
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170 */ |
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171 public boolean isIgnored(Path path) { |
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172 String ps = path.toString(); |
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173 for (Pattern p : entries) { |
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174 int x = ps.indexOf('/'); // reset for each pattern |
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175 if (p.matcher(ps).find()) { |
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176 return true; |
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177 } |
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178 while (x != -1 && x+1 != ps.length() /*skip very last segment not to check complete string twice*/) { |
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179 String fragment = ps.substring(0, x); |
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180 if (p.matcher(fragment).matches()) { |
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181 return true; |
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182 } |
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183 x = ps.indexOf('/', x+1); |
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184 } |
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185 } |
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186 return false; |
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187 } |
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188 |
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189 /** |
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190 * A handy wrap of {@link #isIgnored(Path)} into {@link Path.Matcher}. Yields same result as {@link #isIgnored(Path)}. |
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191 * @return <code>true</code> if file is deemed ignored. |
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192 */ |
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193 public boolean accept(Path path) { |
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194 return isIgnored(path); |
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195 } |
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196 } |