Mercurial > jhg

annotate src/org/tmatesoft/hg/internal/ConfigFile.java @ 709:497e697636fc

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Report merged lines as changed block if possible, not as a sequence of added/deleted blocks. To facilitate access to merge parent lines AddBlock got mergeLineAt() method that reports index of the line in the second parent (if any), while insertedAt() has been changed to report index in the first parent always
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 21 Aug 2013 16:23:27 +0200
parents 6526d8adbc0f
children
rev   line source
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1 /*
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2 * Copyright (c) 2011-2013 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.internal;
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18
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19 import java.io.ByteArrayOutputStream;
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20 import java.io.File;
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21 import java.io.FileOutputStream;
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22 import java.io.IOException;
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23 import java.io.PrintStream;
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24 import java.nio.ByteBuffer;
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25 import java.nio.channels.FileChannel;
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26 import java.nio.channels.FileLock;
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27 import java.util.ArrayList;
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28 import java.util.Collections;
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29 import java.util.Iterator;
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30 import java.util.LinkedHashMap;
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31 import java.util.List;
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32 import java.util.Map;
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33
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34 import org.tmatesoft.hg.core.HgIOException;
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35 import org.tmatesoft.hg.core.SessionContext;
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36 import org.tmatesoft.hg.util.LogFacility;
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37
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38 /**
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39 * .ini / .rc file reader
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40 * @author Artem Tikhomirov
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41 * @author TMate Software Ltd.
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42 */
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43 public class ConfigFile {
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44
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45 private final SessionContext sessionContext;
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46 private List<String> sections;
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47 private List<Map<String,String>> content;
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48
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49 public ConfigFile(SessionContext ctx) {
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50 sessionContext = ctx;
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51 }
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52
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53 public void addLocation(File path) throws HgIOException {
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54 read(path);
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55 }
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57 public boolean hasSection(String sectionName) {
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58 return sections == null ? false : sections.indexOf(sectionName) != -1;
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59 }
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60
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61 public List<String> getSectionNames() {
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62 return sections == null ? Collections.<String>emptyList() : Collections.unmodifiableList(sections);
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63 }
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65 /**
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66 * Access map of section keys and values.
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67 * @param sectionName name of the section to retrieve
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68 * @return never <code>null</code>, empty map in case no section with specified name found
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69 */
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70 public Map<String,String> getSection(String sectionName) {
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71 if (sections == null) {
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72 return Collections.emptyMap();
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73 }
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74 int x = sections.indexOf(sectionName);
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75 if (x == -1) {
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76 return Collections.emptyMap();
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77 }
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78 return Collections.unmodifiableMap(content.get(x));
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79 }
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81 public boolean getBoolean(String sectionName, String key, boolean defaultValue) {
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82 String value = getSection(sectionName).get(key);
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83 if (value == null) {
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84 return defaultValue;
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85 }
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86 for (String s : new String[] { "true", "yes", "on", "1" }) {
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87 if (s.equalsIgnoreCase(value)) {
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88 return true;
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89 }
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90 }
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91 return false;
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92 }
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94 public String getString(String sectionName, String key, String defaultValue) {
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95 String value = getSection(sectionName).get(key);
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96 return value == null ? defaultValue : value;
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97 }
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99 public int getInteger(String sectionName, String key, int defaultValue) {
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100 String value = getSection(sectionName).get(key);
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101 return value == null ? defaultValue : Integer.parseInt(value);
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102 }
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104 public void putString(String sectionName, String key, String newValue) {
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105 Map<String, String> section = null;
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106 if (sections == null) {
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107 // init, in case we didn't read any file with prev config
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108 sections = new ArrayList<String>();
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109 content = new ArrayList<Map<String,String>>();
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110 }
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111 int x = sections.indexOf(sectionName);
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112 if (x == -1) {
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113 if (newValue == null) {
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114 return;
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115 }
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116 sections.add(sectionName);
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117 content.add(section = new LinkedHashMap<String, String>());
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118 } else {
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119 section = content.get(x);
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120 }
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121 if (newValue == null) {
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122 section.remove(key);
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123 } else {
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124 section.put(key, newValue);
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125 }
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126 }
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127
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128 private void read(File f) throws HgIOException {
114
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129 if (f == null || !f.canRead()) {
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130 return;
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131 }
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132 if (sections == null) {
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133 sections = new ArrayList<String>();
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134 content = new ArrayList<Map<String,String>>();
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135 }
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136 new Parser().go(f, this);
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137 ((ArrayList<?>) sections).trimToSize();
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138 ((ArrayList<?>) content).trimToSize();
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139 assert sections.size() == content.size();
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140 }
378
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141
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142 public void writeTo(File f) throws IOException {
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143 byte[] data = compose();
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144 if (!f.exists()) {
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145 f.createNewFile();
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146 }
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147 FileChannel fc = new FileOutputStream(f).getChannel();
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148 FileLock fl = fc.lock();
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149 try {
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150 fc.write(ByteBuffer.wrap(data));
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151 } finally {
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152 fl.release();
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153 fc.close();
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154 }
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155 }
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156
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157 private byte[] compose() {
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158 ByteArrayOutputStream bos = new ByteArrayOutputStream(1024);
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159 PrintStream ps = new PrintStream(bos);
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160 Iterator<String> sectionNames = sections.iterator();
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161 for (Map<String,String> s : content) {
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162 final String name = sectionNames.next(); // iterate through names despite section may be empty
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163 if (s.isEmpty()) {
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164 continue; // do not write an empty section
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165 }
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166 ps.print('[');
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167 ps.print(name);
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168 ps.println(']');
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169 for (Map.Entry<String, String> e : s.entrySet()) {
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170 ps.print(e.getKey());
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171 ps.print('=');
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172 ps.println(e.getValue());
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173 }
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174 ps.println();
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175 }
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176 ps.flush();
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177 return bos.toByteArray();
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178 }
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179
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180 private static class Parser implements LineReader.LineConsumer<ConfigFile> {
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181
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182 private String sectionName = "";
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183 private Map<String,String> section = new LinkedHashMap<String, String>();
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184 private File contextFile;
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185
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186 // TODO [post-1.1] "" and lists
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187 // XXX perhaps, single string to keep whole section with substrings for keys/values to minimize number of arrays (String.value)
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188 public boolean consume(String line, ConfigFile cfg) throws IOException {
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189 int x;
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190 if ((x = line.indexOf('#')) != -1) {
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191 // do not keep comments in memory, get new, shorter string
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192 line = new String(line.substring(0, x).trim());
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193 }
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194 if (line.length() <= 2) { // a=b or [a] are at least of length 3
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195 return true;
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196 }
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197 if (line.charAt(0) == '[' && line.charAt(line.length() - 1) == ']') {
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198 sectionName = line.substring(1, line.length() - 1);
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199 if (cfg.sections.indexOf(sectionName) == -1) {
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200 cfg.sections.add(sectionName);
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201 cfg.content.add(section = new LinkedHashMap<String, String>());
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202 } else {
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203 section = null; // drop cached value
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204 }
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205 } else if (line.startsWith("%unset")) {
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206 if (section != null) {
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207 section.remove(line.substring(7).trim());
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208 }
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209 } else if (line.startsWith("%include")) {
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210 processInclude(line.substring(9).trim(), cfg);
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211 } else if ((x = line.indexOf('=')) != -1) {
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212 // share char[] of the original string
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213 String key = line.substring(0, x).trim();
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214 String value = line.substring(x+1).trim();
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215 if (section == null) {
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216 int i = cfg.sections.indexOf(sectionName);
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217 assert i >= 0;
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218 section = cfg.content.get(i);
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219 }
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220 if (sectionName.length() == 0) {
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221 // add fake section only if there are any values
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222 cfg.sections.add(sectionName);
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223 cfg.content.add(section);
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224 }
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225 section.put(key, value);
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226 }
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227 return true;
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228 }
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229
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230 public void go(File f, ConfigFile cfg) throws HgIOException {
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231 contextFile = f;
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232 LineReader lr = new LineReader(f, cfg.sessionContext.getLog());
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233 lr.ignoreLineComments("#");
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234 lr.read(this, cfg);
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235 }
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236
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237 // include failure doesn't propagate
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238 private void processInclude(String includeValue, ConfigFile cfg) {
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239 File f;
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240 // TODO [post-1.1] handle environment variable expansion
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241 if (includeValue.startsWith("~/")) {
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242 f = new File(System.getProperty("user.home"), includeValue.substring(2));
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243 } else {
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244 f = new File(contextFile.getParentFile(), includeValue);
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245 }
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246 try {
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247 if (f.canRead()) {
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248 new Parser().go(f, cfg);
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249 } else {
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250 LogFacility lf = cfg.sessionContext.getLog();
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251 lf.dump(ConfigFile.class, LogFacility.Severity.Debug, "Can't read file to include: %s", f);
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252 }
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253 } catch (HgIOException ex) {
483
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254 LogFacility lf = cfg.sessionContext.getLog();
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255 lf.dump(ConfigFile.class, LogFacility.Severity.Warn, "Can't include %s (%s)", f, includeValue);
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256 }
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257 }
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258 }
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259 }