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annotate src/org/tmatesoft/hg/internal/NewlineFilter.java @ 113:67ae317408c9

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Filter implementation for newline translation
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 02 Feb 2011 21:19:02 +0100
parents
children 46291ec605a0
rev   line source
113
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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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15 * contact TMate Software at support@svnkit.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
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28 import org.tmatesoft.hg.core.Path;
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29 import org.tmatesoft.hg.repo.HgRepository;
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30
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31 /**
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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 NewlineFilter implements Filter {
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37
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38 // 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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39 // i.e. doesn't try to convert them into appropriate newline characters. XXX revisit if Keyword extension behaves differently
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40 private final boolean allowInconsistent;
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41 private final boolean winToNix;
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42
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43 private NewlineFilter(boolean failIfInconsistent, int transform) {
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44 winToNix = transform == 0;
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45 allowInconsistent = !failIfInconsistent;
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46 }
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47
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48 public ByteBuffer filter(ByteBuffer src) {
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49 if (winToNix) {
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50 return win2nix(src);
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51 } else {
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52 return nix2win(src);
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53 }
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54 }
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55
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56 private ByteBuffer win2nix(ByteBuffer src) {
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57 int x = src.position(); // source index
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58 int lookupStart = x;
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59 ByteBuffer dst = null;
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60 while (x < src.limit()) {
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61 // x, lookupStart, ir and in are absolute positions within src buffer, which is never read with modifying operations
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62 int ir = indexOf('\r', src, lookupStart);
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63 int in = indexOf('\n', src, lookupStart);
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64 if (ir == -1) {
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65 if (in == -1 || allowInconsistent) {
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66 if (dst != null) {
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67 copySlice(src, x, src.limit(), dst);
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68 x = src.limit(); // consumed all
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69 }
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70 break;
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71 } else {
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72 fail(src, in);
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73 }
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74 }
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75 // 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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76 if (in != -1 && in != ir+1 && !allowInconsistent) {
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77 fail(src, in);
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78 }
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79 if (dst == null) {
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80 dst = ByteBuffer.allocate(src.remaining());
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81 }
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82 copySlice(src, x, ir, dst);
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83 if (ir+1 == src.limit()) {
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84 // last char of the buffer -
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85 // consume src till that char and let next iteration work on it
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86 x = ir;
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87 break;
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88 }
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89 if (in != ir + 1) {
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90 x = ir+1; // generally in, but if allowInconsistent==true and \r is not followed by \n, then
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91 // cases like "one \r two \r\n three" shall be processed correctly (second pair would be ignored if x==in)
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92 lookupStart = ir+1;
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93 } else {
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94 x = in;
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95 lookupStart = x+1; // skip \n for next lookup
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96 }
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97 }
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98 src.position(x); // mark we've consumed up to x
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99 return dst == null ? src : (ByteBuffer) dst.flip();
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100 }
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101
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102 private ByteBuffer nix2win(ByteBuffer src) {
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103 int x = src.position();
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104 ByteBuffer dst = null;
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105 while (x < src.limit()) {
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106 int in = indexOf('\n', src, x);
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107 int ir = indexOf('\r', src, x, in == -1 ? src.limit() : in);
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108 if (in == -1) {
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109 if (ir == -1 || allowInconsistent) {
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110 break;
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111 } else {
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112 fail(src, ir);
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113 }
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114 } else if (ir != -1 && !allowInconsistent) {
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115 fail(src, ir);
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116 }
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117
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118 // x <= in < src.limit
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119 // allowInconsistent && x <= ir < in || ir == -1
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120 if (dst == null) {
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121 // buffer full of \n grows as much as twice in size
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122 dst = ByteBuffer.allocate(src.remaining() * 2);
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123 }
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124 copySlice(src, x, in, dst);
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125 if (ir == -1 || ir+1 != in) {
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126 dst.put((byte) '\r');
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127 } // otherwise (ir!=-1 && ir+1==in) we found \r\n pair, don't convert to \r\r\n
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128 // we may copy \n at src[in] on the next iteration, but would need extra lookupIndex variable then.
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129 dst.put((byte) '\n');
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130 x = in+1;
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131 }
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132 src.position(x);
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133 return dst == null ? src : (ByteBuffer) dst.flip();
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134 }
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135
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136
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137 private void fail(ByteBuffer b, int pos) {
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138 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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139 }
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140
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141 private static int indexOf(char ch, ByteBuffer b, int from) {
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142 return indexOf(ch, b, from, b.limit());
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143 }
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144
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145 // looks up in buf[from..to)
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146 private static int indexOf(char ch, ByteBuffer b, int from, int to) {
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147 for (int i = from; i < to; i++) {
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148 byte c = b.get(i);
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149 if (ch == c) {
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150 return i;
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151 }
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152 }
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153 return -1;
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154 }
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155
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156 public static class Factory implements Filter.Factory {
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157 private final boolean localIsWin = File.separatorChar == '\\'; // FIXME
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158 private final boolean failIfInconsistent = true;
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159
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160 public Filter create(HgRepository hgRepo, Path path, Options opts) {
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161 if (opts.getDirection() == FromRepo) {
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162 } else if (opts.getDirection() == ToRepo) {
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163 }
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164 return new NewlineFilter(failIfInconsistent, 1);
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165 }
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166 }
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167
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168 public static void main(String[] args) throws Exception {
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169 FileInputStream fis = new FileInputStream(new File("/temp/design.lf.txt"));
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170 FileOutputStream fos = new FileOutputStream(new File("/temp/design.newline.out"));
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171 ByteBuffer b = ByteBuffer.allocate(12);
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172 NewlineFilter nlFilter = new NewlineFilter(true, 1);
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173 while (fis.getChannel().read(b) != -1) {
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174 b.flip(); // get ready to be read
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175 ByteBuffer f = nlFilter.filter(b);
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176 fos.getChannel().write(f); // XXX in fact, f may not be fully consumed
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177 if (b.hasRemaining()) {
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178 b.compact();
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179 } else {
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180 b.clear();
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181 }
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182 }
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183 fis.close();
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184 fos.flush();
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185 fos.close();
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186 }
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187
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188 }