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annotate src/org/tmatesoft/hg/internal/NewlineFilter.java @ 353:0f3687e79f5a

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Treat content with target line endings as correct regardless eol.only-consistent setting
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 01 Dec 2011 03:05:28 +0100
parents 7b34d24b8f4d
children f2c11fe7f3e9
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.IOException;
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25 import java.nio.ByteBuffer;
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26 import java.util.ArrayList;
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27 import java.util.Map;
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28
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29 import org.tmatesoft.hg.repo.HgInternals;
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30 import org.tmatesoft.hg.repo.HgRepository;
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31 import org.tmatesoft.hg.util.Path;
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32
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33 /**
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34 *
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35 * @author Artem Tikhomirov
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36 * @author TMate Software Ltd.
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37 */
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38 public class NewlineFilter implements Filter {
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39
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40 // 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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41 // i.e. doesn't try to convert them into appropriate newline characters. XXX revisit if Keyword extension behaves differently
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42 private final boolean processInconsistent;
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43 private final boolean winToNix;
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44
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45 // next two factory methods for testsing purposes
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46 public static NewlineFilter createWin2Nix(boolean allowMixed) {
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47 return new NewlineFilter(!allowMixed, 0);
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48 }
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49
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50 public static NewlineFilter createNix2Win(boolean allowMixed) {
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51 return new NewlineFilter(!allowMixed, 1);
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52 }
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53
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54 private NewlineFilter(boolean onlyConsistent, int transform) {
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55 winToNix = transform == 0;
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56 processInconsistent = !onlyConsistent;
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57 }
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58
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59 public ByteBuffer filter(ByteBuffer src) {
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60 if (winToNix) {
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61 return win2nix(src);
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62 } else {
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63 return nix2win(src);
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64 }
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65 }
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66
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67 private boolean foundLoneLF = false;
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68 private boolean foundCRLF = false;
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69
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70 private ByteBuffer win2nix(ByteBuffer src) {
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71 int lookupStart = src.position(); // source index
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72 ByteBuffer dst = null;
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73 final byte CR = (byte) '\r';
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74 final byte LF = (byte) '\n';
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75 while (lookupStart < src.limit()) {
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76 // x, lookupStart, ir and in are absolute positions within src buffer, which is never read with modifying operations
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77 int ir = indexOf(CR, src, lookupStart);
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78 int in = indexOf(LF, src, lookupStart);
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79 if (in != -1) {
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80 if (ir == -1 || ir > in) {
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81 // lone LF. CR, if present, goes after LF, process up to closest LF, let next iteration decide what to do with CR@ir
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82 foundLoneLF = true;
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83 // XXX respect onlyConsistent. if foundCRLF then shall not process further
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84 dst = consume(src, lookupStart, in+1, dst);
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85 lookupStart = in + 1;
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86 } else {
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87 // ir < in
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88 if (onlyCRup2limit(src, ir, in)) {
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89 // CR...CRLF;
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90 foundCRLF = true;
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91 // XXX respect onlyConsistent. if foundLoneLF then shall not process further
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92 dst = consume(src, lookupStart, ir, dst);
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93 dst.put(LF);
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94 lookupStart = in+1;
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95 } else {
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96 // CR...CR...^CR....LF
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97 dst = consume(src, lookupStart, ir+1, dst);
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98 // although can search for ^CR, here I copy CR one by one as I don't expect huge sequences of CR to optimize for
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99 lookupStart = ir+1;
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100 }
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101 }
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102 } else {
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103 // no newlines
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104 if (ir != -1 && onlyCRup2limit(src, ir, src.limit())) {
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105 // \r as last character(s) is the only case we care about when there're no LF found
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106 // cases like \r\r\r<EOB>\n shall be handled like \r\n, hence onlyCRup2limit
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107 dst = consume(src, lookupStart, ir, dst);
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108 lookupStart = src.limit() - 1; // leave only last CR for next buffer
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109 } else {
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110 // consume all. don't create a copy of src if there's no dst yet
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111 if (dst != null) {
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112 copySlice(src, lookupStart, src.limit(), dst);
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113 lookupStart = src.limit();
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114 }
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115 }
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116 break;
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117 }
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118 }
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119 src.position(lookupStart); // mark we've consumed up to x
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120 return dst == null ? src : (ByteBuffer) dst.flip();
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121 }
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122
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123 // true if [from..limit) are CR
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124 private static boolean onlyCRup2limit(ByteBuffer src, int from, int limit) {
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125 // extended version of (ir+1 == src.limit()): check all in [ir..src.limit) are CR
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126 for (int i = from; i < limit; i++) {
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127 if (src.get(i) != '\r') {
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128 return false;
113
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129 }
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130 }
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131 return true;
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132 }
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133 private static ByteBuffer consume(ByteBuffer src, int from, int to, ByteBuffer dst) {
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134 if (dst == null) {
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135 dst = ByteBuffer.allocate(src.remaining());
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136 }
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137 copySlice(src, from, to, dst);
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138 return dst;
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139 }
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140
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141 private ByteBuffer nix2win(ByteBuffer src) {
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142 int x = src.position();
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143 ByteBuffer dst = null;
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144 final byte CR = (byte) '\r';
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145 final byte LF = (byte) '\n';
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146 while (x < src.limit()) {
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147 int in = indexOf(LF, src, x);
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148 if (in != -1) {
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149 if (in > x && src.get(in - 1) == CR) {
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150 foundCRLF = true;
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151 // XXX respect onlyConsistent. if foundLoneLF then shall not process further
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152 if (dst == null) {
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153 dst = ByteBuffer.allocate(src.remaining() * 2);
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154 }
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155 copySlice(src, x, in+1, dst);
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156 x = in + 1;
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157 } else {
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158 // found stand-alone LF, need to output CRLF
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159 foundLoneLF = true;
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160 // XXX respect onlyConsistent. if foundCRLF then shall not process further
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161 if (dst == null) {
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162 dst = ByteBuffer.allocate(src.remaining() * 2);
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163 }
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164 copySlice(src, x, in, dst);
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165 dst.put(CR);
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166 dst.put(LF);
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167 x = in + 1;
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168 }
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169 } else {
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170 // no newlines (no LF), just copy what left
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171 if (dst != null) {
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172 copySlice(src, x, src.limit(), dst);
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173 x = src.limit();
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174 }
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175 break;
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176 }
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177 }
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178 src.position(x);
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179 return dst == null ? src : (ByteBuffer) dst.flip();
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180 }
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181
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182
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183 private void fail(ByteBuffer b, int pos) {
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184 // FIXME checked(?) HgFilterException instead
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185 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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186 }
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187
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188 private static int indexOf(byte ch, ByteBuffer b, int from) {
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189 return indexOf(ch, b, from, b.limit());
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190 }
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191
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192 // looks up in buf[from..to)
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193 private static int indexOf(byte ch, ByteBuffer b, int from, int to) {
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194 for (int i = from; i < to; i++) {
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195 byte c = b.get(i);
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196 if (ch == c) {
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197 return i;
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198 }
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199 }
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200 return -1;
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201 }
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202
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203 public static class Factory implements Filter.Factory {
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204 private boolean processOnlyConsistent = true;
114
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205 private Path.Matcher lfMatcher;
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206 private Path.Matcher crlfMatcher;
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207 private Path.Matcher binMatcher;
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208 private Path.Matcher nativeMatcher;
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209 private String nativeRepoFormat;
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210 private String nativeOSFormat;
113
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211
331
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212 public void initialize(HgRepository hgRepo) {
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213 processOnlyConsistent = hgRepo.getConfiguration().getBooleanValue("eol", "only-consistent", true);
237
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214 File cfgFile = new File(hgRepo.getWorkingDir(), ".hgeol");
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215 if (!cfgFile.canRead()) {
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216 return;
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217 }
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218 // XXX if .hgeol is not checked out, we may get it from repository
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219 // HgDataFile cfgFileNode = hgRepo.getFileNode(".hgeol");
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220 // if (!cfgFileNode.exists()) {
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221 // return;
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222 // }
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223 // XXX perhaps, add HgDataFile.hasWorkingCopy and workingCopyContent()?
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224 ConfigFile hgeol = new ConfigFile();
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225 try {
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226 hgeol.addLocation(cfgFile);
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227 } catch (IOException ex) {
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228 HgInternals.getContext(hgRepo).getLog().warn(getClass(), ex, null);
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229 }
114
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230 nativeRepoFormat = hgeol.getSection("repository").get("native");
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231 if (nativeRepoFormat == null) {
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232 nativeRepoFormat = "LF";
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233 }
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234 final String os = System.getProperty("os.name"); // XXX need centralized set of properties
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235 nativeOSFormat = os.indexOf("Windows") != -1 ? "CRLF" : "LF";
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236 // I assume pattern ordering in .hgeol is not important
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237 ArrayList<String> lfPatterns = new ArrayList<String>();
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238 ArrayList<String> crlfPatterns = new ArrayList<String>();
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239 ArrayList<String> nativePatterns = new ArrayList<String>();
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240 ArrayList<String> binPatterns = new ArrayList<String>();
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241 for (Map.Entry<String,String> e : hgeol.getSection("patterns").entrySet()) {
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242 if ("CRLF".equals(e.getValue())) {
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243 crlfPatterns.add(e.getKey());
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244 } else if ("LF".equals(e.getValue())) {
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245 lfPatterns.add(e.getKey());
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246 } else if ("native".equals(e.getValue())) {
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247 nativePatterns.add(e.getKey());
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248 } else if ("BIN".equals(e.getValue())) {
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249 binPatterns.add(e.getKey());
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250 } else {
295
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251 HgInternals.getContext(hgRepo).getLog().warn(getClass(), "Can't recognize .hgeol entry: %s for %s", e.getValue(), e.getKey());
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252 }
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253 }
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254 if (!crlfPatterns.isEmpty()) {
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255 crlfMatcher = new PathGlobMatcher(crlfPatterns.toArray(new String[crlfPatterns.size()]));
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256 }
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257 if (!lfPatterns.isEmpty()) {
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258 lfMatcher = new PathGlobMatcher(lfPatterns.toArray(new String[lfPatterns.size()]));
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259 }
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260 if (!binPatterns.isEmpty()) {
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261 binMatcher = new PathGlobMatcher(binPatterns.toArray(new String[binPatterns.size()]));
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262 }
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263 if (!nativePatterns.isEmpty()) {
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264 nativeMatcher = new PathGlobMatcher(nativePatterns.toArray(new String[nativePatterns.size()]));
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265 }
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266 }
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267
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268 public Filter create(Path path, Options opts) {
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269 if (binMatcher == null && crlfMatcher == null && lfMatcher == null && nativeMatcher == null) {
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270 // not initialized - perhaps, no .hgeol found
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271 return null;
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272 }
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273 if (binMatcher != null && binMatcher.accept(path)) {
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274 return null;
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275 }
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276 if (crlfMatcher != null && crlfMatcher.accept(path)) {
353
0f3687e79f5a Treat content with target line endings as correct regardless eol.only-consistent setting
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277 return new NewlineFilter(processOnlyConsistent, 1);
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278 } else if (lfMatcher != null && lfMatcher.accept(path)) {
353
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279 return new NewlineFilter(processOnlyConsistent, 0);
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280 } else if (nativeMatcher != null && nativeMatcher.accept(path)) {
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281 if (nativeOSFormat.equals(nativeRepoFormat)) {
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282 return null;
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283 }
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284 if (opts.getDirection() == FromRepo) {
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285 int transform = "CRLF".equals(nativeOSFormat) ? 1 : 0;
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286 return new NewlineFilter(processOnlyConsistent, transform);
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287 } else if (opts.getDirection() == ToRepo) {
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288 int transform = "CRLF".equals(nativeOSFormat) ? 0 : 1;
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289 return new NewlineFilter(processOnlyConsistent, transform);
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290 }
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291 return null;
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292 }
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293 return null;
113
67ae317408c9 Filter implementation for newline translation
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294 }
67ae317408c9 Filter implementation for newline translation
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295 }
67ae317408c9 Filter implementation for newline translation
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296 }