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annotate src/org/tmatesoft/hg/repo/HgIgnore.java @ 705:b4242b7e7dfe

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Merge command: implement conflict resolution alternatives
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 15 Aug 2013 18:43:50 +0200
parents 7efabe0cddcf
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1 /*
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2 * Copyright (c) 2010-2013 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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19 import static org.tmatesoft.hg.repo.HgRepositoryFiles.HgIgnore;
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20 import static org.tmatesoft.hg.util.LogFacility.Severity.Warn;
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21
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22 import java.io.BufferedReader;
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23 import java.io.File;
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24 import java.io.FileReader;
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25 import java.io.IOException;
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26 import java.util.ArrayList;
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27 import java.util.Collections;
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28 import java.util.HashSet;
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29 import java.util.List;
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30 import java.util.Set;
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31 import java.util.regex.Pattern;
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32 import java.util.regex.PatternSyntaxException;
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33
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34 import org.tmatesoft.hg.internal.FileChangeMonitor;
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35 import org.tmatesoft.hg.internal.Internals;
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36 import org.tmatesoft.hg.util.Path;
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37 import org.tmatesoft.hg.util.PathRewrite;
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38
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39 /**
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40 * Handling of ignored paths according to .hgignore configuration
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41 *
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42 * @author Artem Tikhomirov
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43 * @author TMate Software Ltd.
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44 */
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45 public class HgIgnore implements Path.Matcher {
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46
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47 private List<Pattern> entries;
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48 private final PathRewrite globPathHelper;
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49 private FileChangeMonitor ignoreFileTracker;
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50 // if pattern matches first fragment of a path, it will
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51 // match any other path with this fragment, so we can avoid pattern matching
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52 // if path starts with one of such fragments (often for e.g. ignored 'bin/' folders)
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53 private final Set<String> ignoredFirstFragments;
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54
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55 HgIgnore(PathRewrite globPathRewrite) {
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56 entries = Collections.emptyList();
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57 globPathHelper = globPathRewrite;
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58 ignoredFirstFragments = new HashSet<String>();
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59 }
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61 /* package-local */ void read(Internals repo) throws HgInvalidControlFileException {
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62 File ignoreFile = repo.getRepositoryFile(HgIgnore);
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63 BufferedReader fr = null;
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64 try {
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65 if (ignoreFile.canRead() && ignoreFile.isFile()) {
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66 fr = new BufferedReader(new FileReader(ignoreFile));
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67 final List<String> errors = read(fr);
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68 if (errors != null) {
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69 repo.getLog().dump(getClass(), Warn, "Syntax errors parsing %s:\n%s", ignoreFile.getName(), Internals.join(errors, ",\n"));
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70 }
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71 }
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72 if (ignoreFileTracker == null) {
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73 ignoreFileTracker = new FileChangeMonitor(ignoreFile);
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74 }
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75 ignoreFileTracker.touch(this);
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76 } catch (IOException ex) {
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77 final String m = String.format("Error reading %s file", ignoreFile);
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78 throw new HgInvalidControlFileException(m, ex, ignoreFile);
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79 } finally {
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80 try {
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81 if (fr != null) {
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82 fr.close();
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83 }
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84 } catch (IOException ex) {
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85 repo.getLog().dump(getClass(), Warn, ex, null); // it's read, don't treat as error
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86 }
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87 }
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88 }
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90 /*package-local*/ void reloadIfChanged(Internals repo) throws HgInvalidControlFileException {
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91 assert ignoreFileTracker != null;
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92 if (ignoreFileTracker.changed(this)) {
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93 entries = Collections.emptyList();
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94 read(repo);
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95 }
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96 }
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98 /* package-local */ List<String> read(BufferedReader content) throws IOException {
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99 final String REGEXP = "regexp", GLOB = "glob";
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100 final String REGEXP_PREFIX1 = REGEXP + ":", REGEXP_PREFIX2 = "re:", GLOB_PREFIX = GLOB + ":";
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101 ArrayList<String> errors = new ArrayList<String>();
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102 ArrayList<Pattern> result = new ArrayList<Pattern>(entries); // start with existing
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103 String syntax = REGEXP;
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104 String line;
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105 while ((line = content.readLine()) != null) {
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106 line = line.trim();
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107 if (line.startsWith("syntax:")) {
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108 syntax = line.substring("syntax:".length()).trim();
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109 if (!REGEXP.equals(syntax) && !GLOB.equals(syntax)) {
335
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110 errors.add(line);
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111 continue;
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112 //throw new IllegalStateException(line);
91
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113 }
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114 } else if (line.length() > 0) {
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115 // shall I account for local paths in the file (i.e.
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116 // back-slashed on windows)?
269
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117 int x, s = 0;
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118 while ((x = line.indexOf('#', s)) >= 0) {
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119 if (x > 0 && line.charAt(x-1) == '\\') {
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120 // remove escape char
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121 line = line.substring(0, x-1).concat(line.substring(x));
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122 s = x; // with exclusion of char at [x], s now points to what used to be at [x+1]
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123 } else {
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124 line = line.substring(0, x).trim();
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125 }
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126 }
408
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127 // due to the nature of Mercurial implementation, lines prefixed with syntax kind
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128 // are processed correctly (despite the fact hgignore(5) suggest "syntax:<kind>" as the
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129 // only way to specify it). lineSyntax below leaves a chance for the line to switch
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130 // syntax in use without affecting default kind.
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131 String lineSyntax;
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132 if (line.startsWith(GLOB_PREFIX)) {
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133 line = line.substring(GLOB_PREFIX.length()).trim();
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134 lineSyntax = GLOB;
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135 } else if (line.startsWith(REGEXP_PREFIX1)) {
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136 line = line.substring(REGEXP_PREFIX1.length()).trim();
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137 lineSyntax = REGEXP;
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138 } else if (line.startsWith(REGEXP_PREFIX2)) {
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139 line = line.substring(REGEXP_PREFIX2.length()).trim();
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140 lineSyntax = REGEXP;
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141 } else {
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142 lineSyntax = syntax;
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143 }
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144 if (line.length() == 0) {
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145 continue;
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146 }
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147 if (GLOB.equals(lineSyntax)) {
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148 // hgignore(5) says slashes '\' are escape characters,
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149 // however, for glob patterns on Windows first get backslashes converted to slashes
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150 if (globPathHelper != null) {
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151 line = globPathHelper.rewrite(line).toString();
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152 }
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153 line = glob2regex(line);
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154 } else {
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155 assert REGEXP.equals(lineSyntax);
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156 // regular expression patterns need not match start of the line unless demanded explicitly
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157 line = line.charAt(0) == '^' ? line : ".*" + line;
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158 }
335
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159 try {
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160 result.add(Pattern.compile(line)); // case-sensitive
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161 } catch (PatternSyntaxException ex) {
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162 errors.add(line + "@" + ex.getMessage());
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163 }
15
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164 }
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165 }
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166 result.trimToSize();
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167 entries = result;
335
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168 return errors.isEmpty() ? null : errors;
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169 }
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170
91
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171 // note, #isIgnored(), even if queried for directories and returned positive reply, may still get
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172 // a file from that ignored folder to get examined. Thus, patterns like "bin" shall match not only a folder,
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173 // but any file under that folder as well
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174 // Alternatively, file walker may memorize folder is ignored and uses this information for all nested files. However,
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175 // this approach would require walker (a) return directories (b) provide nesting information. This may become
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176 // troublesome when one walks not over io.File, but Eclipse's IResource or any other custom VFS.
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177 //
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178 //
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179 // might be interesting, although looks like of no direct use in my case
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180 // @see http://stackoverflow.com/questions/1247772/is-there-an-equivalent-of-java-util-regex-for-glob-type-patterns
289
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181 //
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182 // TODO consider refactoring to reuse in PathGlobMatcher#glob2regexp
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183 private static String glob2regex(String line) {
91
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184 assert line.length() > 0;
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185 StringBuilder sb = new StringBuilder(line.length() + 10);
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186 int start = 0, end = line.length() - 1;
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187 sb.append("(?:|.*/)"); // glob patterns shall match file in any directory
91
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188
269
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189 int inCurly = 0;
91
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190 for (int i = start; i <= end; i++) {
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191 char ch = line.charAt(i);
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192 if (ch == '.' || ch == '\\') {
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193 sb.append('\\');
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194 } else if (ch == '?') {
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195 // simple '.' substitution might work out, however, more formally
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196 // a char class seems more appropriate to avoid accidentally
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197 // matching a subdirectory with ? char (i.e. /a/b?d against /a/bad, /a/bed and /a/b/d)
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198 // @see http://pubs.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html#tag_02_13_03
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199 // quote: "The slash character in a pathname shall be explicitly matched by using one or more slashes in the pattern;
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200 // it shall neither be matched by the asterisk or question-mark special characters nor by a bracket expression"
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201 sb.append("[^/]");
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202 continue;
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203 } else if (ch == '*') {
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204 sb.append("[^/]*?");
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diff changeset
205 continue;
269
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diff changeset
206 } else if (ch == '{') {
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207 // XXX in fact, need to respect if last char was escaping ('\\'), then don't need to treat this as special
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208 // see link at javadoc above for reasonable example
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209 inCurly++;
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210 sb.append('(');
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211 continue;
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212 } else if (ch == '}') {
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213 if (inCurly > 0) {
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214 inCurly--;
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215 sb.append(')');
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216 continue;
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217 }
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diff changeset
218 } else if (ch == ',' && inCurly > 0) {
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diff changeset
219 sb.append('|');
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diff changeset
220 continue;
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221 }
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222 sb.append(ch);
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223 }
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224 // Python impl doesn't keep empty segments in directory names (ntpath.normpath and posixpath.normpath),
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225 // effectively removing trailing separators, thus patterns like "bin/" get translated into "bin$"
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226 // Our glob rewriter doesn't strip last empty segment, and "bin/$" would be incorrect pattern,
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227 // (e.g. isIgnored("bin/file") performs two matches, against "bin/file" and "bin") hence the check.
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228 if (sb.charAt(sb.length() - 1) != '/') {
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229 sb.append('$');
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230 }
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231 return sb.toString();
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232 }
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233
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234 /**
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235 * @param path file or directory name in question
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236 * @return <code>true</code> if matches repository configuration of ignored files.
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237 */
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238 public boolean isIgnored(Path path) {
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239 String ps = path.toString();
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240 int x = ps.indexOf('/');
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241 if (x != -1 && ignoredFirstFragments.contains(ps.substring(0, x))) {
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242 return true;
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243 }
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244 for (Pattern p : entries) {
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245 if (p.matcher(ps).find()) {
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246 return true;
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247 }
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248 }
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249 boolean firstFragment = true;
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250 while (x != -1 && x+1 != ps.length() /*skip very last segment not to check complete string twice*/) {
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251 String fragment = ps.substring(0, x);
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252 for (Pattern p : entries) {
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253 if (p.matcher(fragment).matches()) {
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254 if (firstFragment) {
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255 ignoredFirstFragments.add(new String(fragment));
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256 }
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257 return true;
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258 }
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259 }
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260 x = ps.indexOf('/', x+1);
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261 firstFragment = false;
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262 }
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263 return false;
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264 }
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265
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266 /**
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267 * A handy wrap of {@link #isIgnored(Path)} into {@link org.tmatesoft.hg.util.Path.Matcher}. Yields same result as {@link #isIgnored(Path)}.
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268 * @return <code>true</code> if file is deemed ignored.
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269 */
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270 public boolean accept(Path path) {
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271 return isIgnored(path);
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272 }
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273 }