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annotate src/org/tmatesoft/hg/internal/NewlineFilter.java @ 331:a37ce7145c3f

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author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sat, 05 Nov 2011 04:21:18 +0100
parents 981f9f50bb6c
children 7b34d24b8f4d
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
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7567f4a42fe5 Correct contact address
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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.io.IOException;
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27 import java.nio.ByteBuffer;
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28 import java.util.ArrayList;
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29 import java.util.Map;
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30
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31 import org.tmatesoft.hg.repo.HgInternals;
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32 import org.tmatesoft.hg.repo.HgRepository;
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33 import org.tmatesoft.hg.util.Path;
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34
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35 /**
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36 *
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37 * @author Artem Tikhomirov
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38 * @author TMate Software Ltd.
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39 */
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40 public class NewlineFilter implements Filter {
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41
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42 // 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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43 // i.e. doesn't try to convert them into appropriate newline characters. XXX revisit if Keyword extension behaves differently
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44 private final boolean allowInconsistent;
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45 private final boolean winToNix;
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46
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47 private NewlineFilter(boolean failIfInconsistent, int transform) {
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48 winToNix = transform == 0;
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49 allowInconsistent = !failIfInconsistent;
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50 }
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51
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52 public ByteBuffer filter(ByteBuffer src) {
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53 if (winToNix) {
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54 return win2nix(src);
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55 } else {
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56 return nix2win(src);
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57 }
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58 }
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59
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60 private ByteBuffer win2nix(ByteBuffer src) {
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61 int x = src.position(); // source index
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62 int lookupStart = x;
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63 ByteBuffer dst = null;
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64 while (x < src.limit()) {
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65 // x, lookupStart, ir and in are absolute positions within src buffer, which is never read with modifying operations
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66 int ir = indexOf('\r', src, lookupStart);
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67 int in = indexOf('\n', src, lookupStart);
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68 if (ir == -1) {
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69 if (in == -1 || allowInconsistent) {
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70 if (dst != null) {
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71 copySlice(src, x, src.limit(), dst);
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72 x = src.limit(); // consumed all
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73 }
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74 break;
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75 } else {
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76 fail(src, in);
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77 }
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78 }
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79 // 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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80 if (in != -1 && in != ir+1 && !allowInconsistent) {
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81 fail(src, in);
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82 }
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83 if (dst == null) {
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84 dst = ByteBuffer.allocate(src.remaining());
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85 }
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86 copySlice(src, x, ir, dst);
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87 if (ir+1 == src.limit()) {
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88 // last char of the buffer -
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89 // consume src till that char and let next iteration work on it
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90 x = ir;
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91 break;
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92 }
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93 if (in != ir + 1) {
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94 x = ir+1; // generally in, but if allowInconsistent==true and \r is not followed by \n, then
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95 // cases like "one \r two \r\n three" shall be processed correctly (second pair would be ignored if x==in)
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96 lookupStart = ir+1;
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97 } else {
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98 x = in;
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99 lookupStart = x+1; // skip \n for next lookup
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100 }
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101 }
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102 src.position(x); // mark we've consumed up to x
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103 return dst == null ? src : (ByteBuffer) dst.flip();
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104 }
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105
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106 private ByteBuffer nix2win(ByteBuffer src) {
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107 int x = src.position();
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108 ByteBuffer dst = null;
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109 while (x < src.limit()) {
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110 int in = indexOf('\n', src, x);
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111 int ir = indexOf('\r', src, x, in == -1 ? src.limit() : in);
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112 if (in == -1) {
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113 if (ir == -1 || allowInconsistent) {
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114 break;
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115 } else {
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116 fail(src, ir);
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117 }
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118 } else if (ir != -1 && !allowInconsistent) {
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119 fail(src, ir);
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120 }
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121
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122 // x <= in < src.limit
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123 // allowInconsistent && x <= ir < in || ir == -1
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124 if (dst == null) {
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125 // buffer full of \n grows as much as twice in size
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126 dst = ByteBuffer.allocate(src.remaining() * 2);
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127 }
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128 copySlice(src, x, in, dst);
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129 if (ir == -1 || ir+1 != in) {
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130 dst.put((byte) '\r');
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131 } // otherwise (ir!=-1 && ir+1==in) we found \r\n pair, don't convert to \r\r\n
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132 // we may copy \n at src[in] on the next iteration, but would need extra lookupIndex variable then.
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133 dst.put((byte) '\n');
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134 x = in+1;
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135 }
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136 src.position(x);
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137 return dst == null ? src : (ByteBuffer) dst.flip();
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138 }
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139
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140
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141 private void fail(ByteBuffer b, int pos) {
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142 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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143 }
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144
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145 private static int indexOf(char ch, ByteBuffer b, int from) {
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146 return indexOf(ch, b, from, b.limit());
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147 }
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148
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149 // looks up in buf[from..to)
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150 private static int indexOf(char ch, ByteBuffer b, int from, int to) {
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151 for (int i = from; i < to; i++) {
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152 byte c = b.get(i);
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153 if (ch == c) {
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154 return i;
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155 }
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156 }
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157 return -1;
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158 }
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159
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160 public static class Factory implements Filter.Factory {
114
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161 private boolean failIfInconsistent = true;
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162 private Path.Matcher lfMatcher;
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163 private Path.Matcher crlfMatcher;
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164 private Path.Matcher binMatcher;
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165 private Path.Matcher nativeMatcher;
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166 private String nativeRepoFormat;
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167 private String nativeOSFormat;
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168
331
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169 public void initialize(HgRepository hgRepo) {
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170 failIfInconsistent = hgRepo.getConfiguration().getBooleanValue("eol", "only-consistent", true);
237
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171 File cfgFile = new File(hgRepo.getWorkingDir(), ".hgeol");
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172 if (!cfgFile.canRead()) {
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173 return;
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174 }
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175 // XXX if .hgeol is not checked out, we may get it from repository
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176 // HgDataFile cfgFileNode = hgRepo.getFileNode(".hgeol");
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177 // if (!cfgFileNode.exists()) {
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178 // return;
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179 // }
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180 // XXX perhaps, add HgDataFile.hasWorkingCopy and workingCopyContent()?
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181 ConfigFile hgeol = new ConfigFile();
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182 try {
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183 hgeol.addLocation(cfgFile);
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184 } catch (IOException ex) {
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185 HgInternals.getContext(hgRepo).getLog().warn(getClass(), ex, null);
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186 }
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187 nativeRepoFormat = hgeol.getSection("repository").get("native");
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188 if (nativeRepoFormat == null) {
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189 nativeRepoFormat = "LF";
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190 }
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191 final String os = System.getProperty("os.name"); // XXX need centralized set of properties
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192 nativeOSFormat = os.indexOf("Windows") != -1 ? "CRLF" : "LF";
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193 // I assume pattern ordering in .hgeol is not important
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194 ArrayList<String> lfPatterns = new ArrayList<String>();
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195 ArrayList<String> crlfPatterns = new ArrayList<String>();
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196 ArrayList<String> nativePatterns = new ArrayList<String>();
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197 ArrayList<String> binPatterns = new ArrayList<String>();
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198 for (Map.Entry<String,String> e : hgeol.getSection("patterns").entrySet()) {
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199 if ("CRLF".equals(e.getValue())) {
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200 crlfPatterns.add(e.getKey());
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201 } else if ("LF".equals(e.getValue())) {
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202 lfPatterns.add(e.getKey());
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203 } else if ("native".equals(e.getValue())) {
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204 nativePatterns.add(e.getKey());
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205 } else if ("BIN".equals(e.getValue())) {
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206 binPatterns.add(e.getKey());
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207 } else {
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208 HgInternals.getContext(hgRepo).getLog().warn(getClass(), "Can't recognize .hgeol entry: %s for %s", e.getValue(), e.getKey());
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209 }
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210 }
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211 if (!crlfPatterns.isEmpty()) {
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212 crlfMatcher = new PathGlobMatcher(crlfPatterns.toArray(new String[crlfPatterns.size()]));
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213 }
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214 if (!lfPatterns.isEmpty()) {
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215 lfMatcher = new PathGlobMatcher(lfPatterns.toArray(new String[lfPatterns.size()]));
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216 }
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217 if (!binPatterns.isEmpty()) {
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218 binMatcher = new PathGlobMatcher(binPatterns.toArray(new String[binPatterns.size()]));
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219 }
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220 if (!nativePatterns.isEmpty()) {
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221 nativeMatcher = new PathGlobMatcher(nativePatterns.toArray(new String[nativePatterns.size()]));
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222 }
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223 }
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224
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225 public Filter create(Path path, Options opts) {
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226 if (binMatcher == null && crlfMatcher == null && lfMatcher == null && nativeMatcher == null) {
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227 // not initialized - perhaps, no .hgeol found
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228 return null;
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229 }
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230 if (binMatcher != null && binMatcher.accept(path)) {
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231 return null;
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232 }
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233 if (crlfMatcher != null && crlfMatcher.accept(path)) {
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234 return new NewlineFilter(failIfInconsistent, 1);
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235 } else if (lfMatcher != null && lfMatcher.accept(path)) {
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236 return new NewlineFilter(failIfInconsistent, 0);
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237 } else if (nativeMatcher != null && nativeMatcher.accept(path)) {
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238 if (nativeOSFormat.equals(nativeRepoFormat)) {
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239 return null;
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240 }
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241 if (opts.getDirection() == FromRepo) {
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242 int transform = "CRLF".equals(nativeOSFormat) ? 1 : 0;
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243 return new NewlineFilter(failIfInconsistent, transform);
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244 } else if (opts.getDirection() == ToRepo) {
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245 int transform = "CRLF".equals(nativeOSFormat) ? 0 : 1;
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246 return new NewlineFilter(failIfInconsistent, transform);
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247 }
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248 return null;
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249 }
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250 return null;
113
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251 }
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252 }
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253
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254 public static void main(String[] args) throws Exception {
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255 FileInputStream fis = new FileInputStream(new File("/temp/design.lf.txt"));
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256 FileOutputStream fos = new FileOutputStream(new File("/temp/design.newline.out"));
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257 ByteBuffer b = ByteBuffer.allocate(12);
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258 NewlineFilter nlFilter = new NewlineFilter(true, 1);
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259 while (fis.getChannel().read(b) != -1) {
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260 b.flip(); // get ready to be read
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261 ByteBuffer f = nlFilter.filter(b);
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262 fos.getChannel().write(f); // XXX in fact, f may not be fully consumed
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263 if (b.hasRemaining()) {
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264 b.compact();
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265 } else {
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266 b.clear();
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267 }
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268 }
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269 fis.close();
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270 fos.flush();
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271 fos.close();
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272 }
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273
67ae317408c9 Filter implementation for newline translation
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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