Mercurial > jhg

annotate src/org/tmatesoft/hg/repo/HgIgnore.java @ 338:3cfa4d908fc9

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Add options to control DataAccessProvider, allow to turn off use of file memory mapping in particular to solve potential sharing violation (os file handle gets released on MappedByteByffer being GC'd, not on FileChannel.close())
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 15 Nov 2011 04:47:03 +0100
parents 3d41dc148d14
children 863356c2847e
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 import java.util.regex.PatternSyntaxException;
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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 }
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94 try {
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95 result.add(Pattern.compile(line)); // case-sensitive
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96 } catch (PatternSyntaxException ex) {
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97 errors.add(line + "@" + ex.getMessage());
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98 }
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99 }
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100 }
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101 result.trimToSize();
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102 entries = result;
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103 return errors.isEmpty() ? null : errors;
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104 }
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105
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106 // note, #isIgnored(), even if queried for directories and returned positive reply, may still get
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107 // a file from that ignored folder to get examined. Thus, patterns like "bin" shall match not only a folder,
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108 // but any file under that folder as well
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109 // Alternatively, file walker may memorize folder is ignored and uses this information for all nested files. However,
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110 // this approach would require walker (a) return directories (b) provide nesting information. This may become
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111 // troublesome when one walks not over io.File, but Eclipse's IResource or any other custom VFS.
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112 //
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113 //
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114 // might be interesting, although looks like of no direct use in my case
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115 // @see http://stackoverflow.com/questions/1247772/is-there-an-equivalent-of-java-util-regex-for-glob-type-patterns
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116 //
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117 // TODO consider refactoring to reuse in PathGlobMatcher#glob2regexp
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118 private static String glob2regex(String line) {
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119 assert line.length() > 0;
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120 StringBuilder sb = new StringBuilder(line.length() + 10);
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121 if (line.charAt(0) != '*') {
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122 sb.append('^'); // help avoid matcher.find() to match 'bin' pattern in the middle of the filename
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123 }
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124 int start = 0, end = line.length() - 1;
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125 // '*' at the beginning and end of a line are useless for Pattern
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126 // XXX although how about **.txt - such globs can be seen in a config, are they valid for HgIgnore?
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127 while (start <= end && line.charAt(start) == '*') start++;
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128 while (end > start && line.charAt(end) == '*') end--;
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129
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130 int inCurly = 0;
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131 for (int i = start; i <= end; i++) {
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132 char ch = line.charAt(i);
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133 if (ch == '.' || ch == '\\') {
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134 sb.append('\\');
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135 } else if (ch == '?') {
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136 // simple '.' substitution might work out, however, more formally
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137 // a char class seems more appropriate to avoid accidentally
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138 // matching a subdirectory with ? char (i.e. /a/b?d against /a/bad, /a/bed and /a/b/d)
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139 // @see http://pubs.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html#tag_02_13_03
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140 // quote: "The slash character in a pathname shall be explicitly matched by using one or more slashes in the pattern;
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141 // it shall neither be matched by the asterisk or question-mark special characters nor by a bracket expression"
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142 sb.append("[^/]");
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143 continue;
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144 } else if (ch == '*') {
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145 sb.append("[^/]*?");
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146 continue;
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147 } else if (ch == '{') {
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148 // XXX in fact, need to respect if last char was escaping ('\\'), then don't need to treat this as special
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149 // see link at javadoc above for reasonable example
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150 inCurly++;
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151 sb.append('(');
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152 continue;
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153 } else if (ch == '}') {
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154 if (inCurly > 0) {
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155 inCurly--;
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156 sb.append(')');
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157 continue;
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158 }
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159 } else if (ch == ',' && inCurly > 0) {
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160 sb.append('|');
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161 continue;
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162 }
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163 sb.append(ch);
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164 }
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165 return sb.toString();
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166 }
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167
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168 /**
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169 * @param path file or directory name in question
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170 * @return <code>true</code> if matches repository configuration of ignored files.
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171 */
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172 public boolean isIgnored(Path path) {
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173 for (Pattern p : entries) {
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174 if (p.matcher(path).find()) {
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175 return true;
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176 }
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177 }
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178 return false;
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179 }
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180
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181 /**
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182 * A handy wrap of {@link #isIgnored(Path)} into {@link Path.Matcher}. Yields same result as {@link #isIgnored(Path)}.
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183 * @return <code>true</code> if file is deemed ignored.
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184 */
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185 public boolean accept(Path path) {
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186 return isIgnored(path);
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187 }
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188 }