Mercurial > hg4j

annotate src/org/tmatesoft/hg/internal/NewlineFilter.java @ 133:4a948ec83980

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
core.Path to util.Path as it's not Hg repo dependant
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 16 Feb 2011 20:59:39 +0100
parents 7567f4a42fe5
children 6e1373b54e9b
rev   line source
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1 /*
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2 * Copyright (c) 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
130
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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 static org.tmatesoft.hg.internal.Filter.Direction.FromRepo;
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20 import static org.tmatesoft.hg.internal.Filter.Direction.ToRepo;
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21 import static org.tmatesoft.hg.internal.KeywordFilter.copySlice;
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22
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23 import java.io.File;
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24 import java.io.FileInputStream;
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25 import java.io.FileOutputStream;
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26 import java.nio.ByteBuffer;
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27 import java.util.ArrayList;
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28 import java.util.Map;
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29
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30 import org.tmatesoft.hg.repo.HgInternals;
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31 import org.tmatesoft.hg.repo.HgRepository;
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32 import org.tmatesoft.hg.util.Path;
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33
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34 /**
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35 *
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36 * @author Artem Tikhomirov
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37 * @author TMate Software Ltd.
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38 */
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39 public class NewlineFilter implements Filter {
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40
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41 // if allowInconsistent is true, filter simply pass incorrect newline characters (single \r or \r\n on *nix and single \n on Windows) as is,
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42 // i.e. doesn't try to convert them into appropriate newline characters. XXX revisit if Keyword extension behaves differently
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43 private final boolean allowInconsistent;
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44 private final boolean winToNix;
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45
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46 private NewlineFilter(boolean failIfInconsistent, int transform) {
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47 winToNix = transform == 0;
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48 allowInconsistent = !failIfInconsistent;
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49 }
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50
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51 public ByteBuffer filter(ByteBuffer src) {
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52 if (winToNix) {
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53 return win2nix(src);
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54 } else {
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55 return nix2win(src);
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56 }
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57 }
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58
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59 private ByteBuffer win2nix(ByteBuffer src) {
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60 int x = src.position(); // source index
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61 int lookupStart = x;
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62 ByteBuffer dst = null;
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63 while (x < src.limit()) {
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64 // x, lookupStart, ir and in are absolute positions within src buffer, which is never read with modifying operations
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65 int ir = indexOf('\r', src, lookupStart);
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66 int in = indexOf('\n', src, lookupStart);
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67 if (ir == -1) {
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68 if (in == -1 || allowInconsistent) {
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69 if (dst != null) {
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70 copySlice(src, x, src.limit(), dst);
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71 x = src.limit(); // consumed all
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72 }
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73 break;
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74 } else {
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75 fail(src, in);
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76 }
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77 }
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78 // in == -1 while ir != -1 may be valid case if ir is the last char of the buffer, we check below for that
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79 if (in != -1 && in != ir+1 && !allowInconsistent) {
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80 fail(src, in);
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81 }
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82 if (dst == null) {
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83 dst = ByteBuffer.allocate(src.remaining());
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84 }
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85 copySlice(src, x, ir, dst);
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86 if (ir+1 == src.limit()) {
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87 // last char of the buffer -
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88 // consume src till that char and let next iteration work on it
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89 x = ir;
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90 break;
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91 }
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92 if (in != ir + 1) {
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93 x = ir+1; // generally in, but if allowInconsistent==true and \r is not followed by \n, then
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94 // cases like "one \r two \r\n three" shall be processed correctly (second pair would be ignored if x==in)
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95 lookupStart = ir+1;
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96 } else {
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97 x = in;
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98 lookupStart = x+1; // skip \n for next lookup
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99 }
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100 }
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101 src.position(x); // mark we've consumed up to x
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102 return dst == null ? src : (ByteBuffer) dst.flip();
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103 }
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104
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105 private ByteBuffer nix2win(ByteBuffer src) {
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106 int x = src.position();
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107 ByteBuffer dst = null;
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108 while (x < src.limit()) {
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109 int in = indexOf('\n', src, x);
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110 int ir = indexOf('\r', src, x, in == -1 ? src.limit() : in);
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111 if (in == -1) {
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112 if (ir == -1 || allowInconsistent) {
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113 break;
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114 } else {
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115 fail(src, ir);
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116 }
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117 } else if (ir != -1 && !allowInconsistent) {
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118 fail(src, ir);
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119 }
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120
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121 // x <= in < src.limit
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122 // allowInconsistent && x <= ir < in || ir == -1
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123 if (dst == null) {
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124 // buffer full of \n grows as much as twice in size
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125 dst = ByteBuffer.allocate(src.remaining() * 2);
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126 }
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127 copySlice(src, x, in, dst);
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128 if (ir == -1 || ir+1 != in) {
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129 dst.put((byte) '\r');
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130 } // otherwise (ir!=-1 && ir+1==in) we found \r\n pair, don't convert to \r\r\n
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131 // we may copy \n at src[in] on the next iteration, but would need extra lookupIndex variable then.
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132 dst.put((byte) '\n');
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133 x = in+1;
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134 }
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135 src.position(x);
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136 return dst == null ? src : (ByteBuffer) dst.flip();
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137 }
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138
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139
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140 private void fail(ByteBuffer b, int pos) {
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141 throw new RuntimeException(String.format("Inconsistent newline characters in the stream (char 0x%x, local index:%d)", b.get(pos), pos));
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142 }
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143
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144 private static int indexOf(char ch, ByteBuffer b, int from) {
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145 return indexOf(ch, b, from, b.limit());
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146 }
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147
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148 // looks up in buf[from..to)
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149 private static int indexOf(char ch, ByteBuffer b, int from, int to) {
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150 for (int i = from; i < to; i++) {
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151 byte c = b.get(i);
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152 if (ch == c) {
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153 return i;
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154 }
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155 }
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156 return -1;
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157 }
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158
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159 public static class Factory implements Filter.Factory {
114
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160 private boolean failIfInconsistent = true;
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161 private Path.Matcher lfMatcher;
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162 private Path.Matcher crlfMatcher;
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163 private Path.Matcher binMatcher;
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164 private Path.Matcher nativeMatcher;
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165 private String nativeRepoFormat;
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166 private String nativeOSFormat;
113
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167
114
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168 public void initialize(HgRepository hgRepo, ConfigFile cfg) {
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169 failIfInconsistent = cfg.getBoolean("eol", "only-consistent", true);
118
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170 File cfgFile = new File(new HgInternals(hgRepo).getRepositoryDir().getParentFile(), ".hgeol");
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171 if (!cfgFile.canRead()) {
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172 return;
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173 }
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174 // XXX if .hgeol is not checked out, we may get it from repository
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175 // HgDataFile cfgFileNode = hgRepo.getFileNode(".hgeol");
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176 // if (!cfgFileNode.exists()) {
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177 // return;
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178 // }
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179 // XXX perhaps, add HgDataFile.hasWorkingCopy and workingCopyContent()?
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180 ConfigFile hgeol = new ConfigFile();
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181 hgeol.addLocation(cfgFile);
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182 nativeRepoFormat = hgeol.getSection("repository").get("native");
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183 if (nativeRepoFormat == null) {
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184 nativeRepoFormat = "LF";
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185 }
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186 final String os = System.getProperty("os.name"); // XXX need centralized set of properties
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187 nativeOSFormat = os.indexOf("Windows") != -1 ? "CRLF" : "LF";
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188 // I assume pattern ordering in .hgeol is not important
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189 ArrayList<String> lfPatterns = new ArrayList<String>();
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190 ArrayList<String> crlfPatterns = new ArrayList<String>();
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191 ArrayList<String> nativePatterns = new ArrayList<String>();
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192 ArrayList<String> binPatterns = new ArrayList<String>();
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193 for (Map.Entry<String,String> e : hgeol.getSection("patterns").entrySet()) {
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194 if ("CRLF".equals(e.getValue())) {
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195 crlfPatterns.add(e.getKey());
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196 } else if ("LF".equals(e.getValue())) {
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197 lfPatterns.add(e.getKey());
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198 } else if ("native".equals(e.getValue())) {
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199 nativePatterns.add(e.getKey());
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200 } else if ("BIN".equals(e.getValue())) {
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201 binPatterns.add(e.getKey());
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202 } else {
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203 System.out.printf("Can't recognize .hgeol entry: %s for %s", e.getValue(), e.getKey()); // FIXME log warning
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204 }
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205 }
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206 if (!crlfPatterns.isEmpty()) {
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207 crlfMatcher = new PathGlobMatcher(crlfPatterns.toArray(new String[crlfPatterns.size()]));
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208 }
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209 if (!lfPatterns.isEmpty()) {
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210 lfMatcher = new PathGlobMatcher(lfPatterns.toArray(new String[lfPatterns.size()]));
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211 }
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212 if (!binPatterns.isEmpty()) {
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213 binMatcher = new PathGlobMatcher(binPatterns.toArray(new String[binPatterns.size()]));
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214 }
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215 if (!nativePatterns.isEmpty()) {
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216 nativeMatcher = new PathGlobMatcher(nativePatterns.toArray(new String[nativePatterns.size()]));
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217 }
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218 }
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219
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220 public Filter create(Path path, Options opts) {
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221 if (binMatcher == null && crlfMatcher == null && lfMatcher == null && nativeMatcher == null) {
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222 // not initialized - perhaps, no .hgeol found
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223 return null;
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224 }
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225 if (binMatcher != null && binMatcher.accept(path)) {
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226 return null;
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227 }
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228 if (crlfMatcher != null && crlfMatcher.accept(path)) {
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229 return new NewlineFilter(failIfInconsistent, 1);
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230 } else if (lfMatcher != null && lfMatcher.accept(path)) {
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231 return new NewlineFilter(failIfInconsistent, 0);
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232 } else if (nativeMatcher != null && nativeMatcher.accept(path)) {
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233 if (nativeOSFormat.equals(nativeRepoFormat)) {
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234 return null;
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235 }
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236 if (opts.getDirection() == FromRepo) {
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237 int transform = "CRLF".equals(nativeOSFormat) ? 1 : 0;
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238 return new NewlineFilter(failIfInconsistent, transform);
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239 } else if (opts.getDirection() == ToRepo) {
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240 int transform = "CRLF".equals(nativeOSFormat) ? 0 : 1;
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241 return new NewlineFilter(failIfInconsistent, transform);
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242 }
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243 return null;
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244 }
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245 return null;
113
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246 }
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247 }
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248
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249 public static void main(String[] args) throws Exception {
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250 FileInputStream fis = new FileInputStream(new File("/temp/design.lf.txt"));
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251 FileOutputStream fos = new FileOutputStream(new File("/temp/design.newline.out"));
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252 ByteBuffer b = ByteBuffer.allocate(12);
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253 NewlineFilter nlFilter = new NewlineFilter(true, 1);
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254 while (fis.getChannel().read(b) != -1) {
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255 b.flip(); // get ready to be read
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256 ByteBuffer f = nlFilter.filter(b);
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257 fos.getChannel().write(f); // XXX in fact, f may not be fully consumed
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258 if (b.hasRemaining()) {
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259 b.compact();
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260 } else {
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261 b.clear();
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262 }
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263 }
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264 fis.close();
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265 fos.flush();
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266 fos.close();
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267 }
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268
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269 }