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annotate src/org/tmatesoft/hg/repo/HgIgnore.java @ 255:5a6ab50b4cbf

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Improve memory footprint of tag collection (about 14 Mb saved for cpython repo without HashMap.Entry and Entry[])
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 16 Aug 2011 14:33:11 +0200
parents fad70a9e6c7f
children 7af843ecc378
rev   line source
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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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a3a2e5deb320 Updated contact address to support@hg4j.com
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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
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28 import org.tmatesoft.hg.util.Path;
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29
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30 /**
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31 * Handling of ignored paths according to .hgignore configuration
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32 *
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33 * @author Artem Tikhomirov
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34 * @author TMate Software Ltd.
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35 */
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36 public class HgIgnore {
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37
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38 private List<Pattern> entries;
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39
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40 HgIgnore() {
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41 entries = Collections.emptyList();
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42 }
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43
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44 /* package-local */void read(File hgignoreFile) throws IOException {
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45 if (!hgignoreFile.exists()) {
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46 return;
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47 }
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48 ArrayList<Pattern> result = new ArrayList<Pattern>(entries); // start with existing
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49 String syntax = "regex"; // or "glob"
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50 BufferedReader fr = new BufferedReader(new FileReader(hgignoreFile));
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51 String line;
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52 while ((line = fr.readLine()) != null) {
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53 line = line.trim();
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54 if (line.startsWith("syntax:")) {
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55 syntax = line.substring("syntax:".length()).trim();
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56 if (!"regex".equals(syntax) && !"glob".equals(syntax)) {
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57 throw new IllegalStateException(line);
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58 }
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59 } else if (line.length() > 0) {
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60 // shall I account for local paths in the file (i.e.
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61 // back-slashed on windows)?
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62 int x;
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63 if ((x = line.indexOf('#')) >= 0) {
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64 line = line.substring(0, x).trim();
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65 if (line.length() == 0) {
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66 continue;
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67 }
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68 }
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69 if ("glob".equals(syntax)) {
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70 // hgignore(5)
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71 // (http://www.selenic.com/mercurial/hgignore.5.html) says slashes '\' are escape characters,
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72 // hence no special treatment of Windows path
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73 // however, own attempts make me think '\' on Windows are not treated as escapes
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74 line = glob2regex(line);
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75 }
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76 result.add(Pattern.compile(line)); // case-sensitive
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77 }
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78 }
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79 fr.close();
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80 result.trimToSize();
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81 entries = result;
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82 }
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83
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84 // note, #isIgnored(), even if queried for directories and returned positive reply, may still get
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85 // a file from that ignored folder to get examined. Thus, patterns like "bin" shall match not only a folder,
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86 // but any file under that folder as well
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87 // Alternatively, file walker may memorize folder is ignored and uses this information for all nested files. However,
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88 // this approach would require walker (a) return directories (b) provide nesting information. This may become
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89 // troublesome when one walks not over io.File, but Eclipse's IResource or any other custom VFS.
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90 //
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91 //
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92 // might be interesting, although looks like of no direct use in my case
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93 // @see http://stackoverflow.com/questions/1247772/is-there-an-equivalent-of-java-util-regex-for-glob-type-patterns
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94 private String glob2regex(String line) {
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95 assert line.length() > 0;
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96 StringBuilder sb = new StringBuilder(line.length() + 10);
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97 sb.append('^'); // help avoid matcher.find() to match 'bin' pattern in the middle of the filename
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98 int start = 0, end = line.length() - 1;
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99 // '*' at the beginning and end of a line are useless for Pattern
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100 // XXX although how about **.txt - such globs can be seen in a config, are they valid for HgIgnore?
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101 while (start <= end && line.charAt(start) == '*') start++;
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102 while (end > start && line.charAt(end) == '*') end--;
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103
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104 for (int i = start; i <= end; i++) {
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105 char ch = line.charAt(i);
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106 if (ch == '.' || ch == '\\') {
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107 sb.append('\\');
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108 } else if (ch == '?') {
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109 // simple '.' substitution might work out, however, more formally
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110 // a char class seems more appropriate to avoid accidentally
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111 // matching a subdirectory with ? char (i.e. /a/b?d against /a/bad, /a/bed and /a/b/d)
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112 // @see http://pubs.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html#tag_02_13_03
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113 // quote: "The slash character in a pathname shall be explicitly matched by using one or more slashes in the pattern;
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114 // it shall neither be matched by the asterisk or question-mark special characters nor by a bracket expression"
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115 sb.append("[^/]");
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116 continue;
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117 } else if (ch == '*') {
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118 sb.append("[^/]*?");
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119 continue;
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120 }
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121 sb.append(ch);
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122 }
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123 return sb.toString();
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124 }
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125
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126 // TODO use PathGlobMatcher
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127 public boolean isIgnored(Path path) {
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128 for (Pattern p : entries) {
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129 if (p.matcher(path).find()) {
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130 return true;
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131 }
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132 }
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133 return false;
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134 }
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135 }