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

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Report merged lines as changed block if possible, not as a sequence of added/deleted blocks. To facilitate access to merge parent lines AddBlock got mergeLineAt() method that reports index of the line in the second parent (if any), while insertedAt() has been changed to report index in the first parent always
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 21 Aug 2013 16:23:27 +0200
parents 7c0d2ce340b8
children
rev   line source
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1 /*
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2 * Copyright (c) 2011-2013 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.internal;
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18
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19 import java.io.IOException;
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20 import java.util.ArrayList;
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21 import java.util.Formatter;
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22
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23 import org.tmatesoft.hg.core.HgIOException;
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24
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25 /**
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26 * @see http://mercurial.selenic.com/wiki/BundleFormat
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27 * in Changelog group description
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28 *
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29 * range [start..end) in original source gets replaced with data of length (do not keep, use data.length instead)
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30 * range [end(i)..start(i+1)) is copied from the source
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31 *
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32 * @author Artem Tikhomirov
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33 * @author TMate Software Ltd.
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34 */
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35 public final class Patch {
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36 private final IntVector starts, ends;
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37 private final ArrayList<byte[]> data;
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38 private final boolean shallNormalize;
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39
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40 private static byte[] generate(int c) {
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41 byte[] rv = new byte[c];
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42 for (int i = 0; i < c; i++) {
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43 byte x = (byte) ('a' + i);
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44 rv[i] = x;
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45 }
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46 return rv;
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47 }
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48
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49 public static void main(String[] args) {
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50 Patch p1 = new Patch(), p2 = new Patch();
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51 // simple cases (one element in either patch)
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52 // III: (1,10 20) & (5,15,15) p2End from [p1End..p1AppliedEnd] (i.e. within p1 range but index is past p2 end index)
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53 // II: (1,10,7) & (3,15,15) insideP2 = true and no more p1 entries
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54 // II: (1,1,10) & (3,11,15)
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55 // independent: (1,10,10) & (15,25,10); (15, 25, 10) & (1, 10, 10)
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56 // I: (15, 25, 10) & (10, 20, 10). result: [10, 20, 10] [20, 25, 5]
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57 // IV: (15, 25, 10) & (10, 30, 20)
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58 //
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59 // cycle with insideP2
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60 //
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61 // cycle with insideP1
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62 //
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63 // multiple elements in patches (offsets)
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64 p1.add(15, 25, generate(10));
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65 p2.add(10, 30, generate(20));
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66 System.out.println("p1: " + p1);
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67 System.out.println("p2: " + p2);
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68 Patch r = p1.apply(p2);
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69 System.out.println("r: " + r);
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70 }
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71
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72 public Patch() {
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73 this(16, false);
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74 }
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75
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76 public Patch(boolean normalizeOnChange) {
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77 this(16, normalizeOnChange);
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78 }
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79
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80 public Patch(int sizeHint, boolean normalizeOnChange) {
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81 shallNormalize = normalizeOnChange;
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82 starts = new IntVector(sizeHint, -1);
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83 ends = new IntVector(sizeHint, -1);
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84 data = new ArrayList<byte[]>(sizeHint);
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85 }
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86
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87 public String toString() {
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88 StringBuilder sb = new StringBuilder();
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89 Formatter f = new Formatter(sb);
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90 for (int i = 0; i < count(); i++) {
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91 f.format("[%d, %d, %d] ", starts.get(i), ends.get(i), data.get(i).length);
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92 }
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93 return sb.toString();
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94 }
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95
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96 public int count() {
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97 return data.size();
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98 }
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99
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100 // number of bytes this patch will add (or remove, if negative) from the base revision
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101 public int patchSizeDelta() {
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102 int rv = 0;
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103 int prevEnd = 0;
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104 for (int i = 0, x = data.size(); i < x; i++) {
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105 final int start = starts.get(i);
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106 final int len = data.get(i).length;
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107 rv += start - prevEnd; // would copy from original
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108 rv += len; // and add new
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109 prevEnd = ends.get(i);
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110 }
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111 rv -= prevEnd;
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112 return rv;
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113 }
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114
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115 public byte[] apply(DataAccess baseRevisionContent, int outcomeLen) throws IOException {
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116 if (outcomeLen == -1) {
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117 outcomeLen = baseRevisionContent.length() + patchSizeDelta();
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118 }
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119 int prevEnd = 0, destIndex = 0;
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120 byte[] rv = new byte[outcomeLen];
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121 for (int i = 0, x = data.size(); i < x; i++) {
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122 final int start = starts.get(i);
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123 baseRevisionContent.seek(prevEnd);
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124 // copy source bytes that were not modified (up to start of the record)
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125 baseRevisionContent.readBytes(rv, destIndex, start - prevEnd);
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126 destIndex += start - prevEnd;
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127 // insert new data from the patch, if any
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128 byte[] d = data.get(i);
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129 System.arraycopy(d, 0, rv, destIndex, d.length);
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130 destIndex += d.length;
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131 prevEnd = ends.get(i);
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132 }
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133 baseRevisionContent.seek(prevEnd);
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134 // copy everything in the source past last record's end
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135 baseRevisionContent.readBytes(rv, destIndex, (baseRevisionContent.length() - prevEnd));
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136 return rv;
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137 }
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138
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139 public void clear() {
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140 starts.clear();
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141 ends.clear();
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142 data.clear();
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143 }
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144
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145 /**
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146 * Initialize instance from stream. Any previous patch information (i.e. if instance if reused) is cleared first.
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147 * Read up to the end of DataAccess and interpret data as patch records.
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148 */
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149 public void read(DataAccess da) throws IOException {
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150 clear();
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151 while (!da.isEmpty()) {
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152 readOne(da);
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153 }
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154 }
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155
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156 /**
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157 * Caller is responsible to ensure stream got some data to read
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158 */
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159 public void readOne(DataAccess da) throws IOException {
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160 int s = da.readInt();
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161 int e = da.readInt();
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162 int len = da.readInt();
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163 byte[] src = new byte[len];
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164 da.readBytes(src, 0, len);
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165 starts.add(s);
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166 ends.add(e);
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167 data.add(src);
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168 }
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169
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170 /**
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171 * @return how many bytes the patch would take if written down using BundleFormat structure (start, end, length, data)
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172 */
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173 public int serializedLength() {
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174 int totalDataLen = 0;
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175 for (byte[] d : data) {
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176 totalDataLen += d.length;
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177 }
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178 int prefix = 3 * 4 * count(); // 3 integer fields per entry * sizeof(int) * number of entries
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179 return prefix + totalDataLen;
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180 }
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181
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182 /*package-local*/ void serialize(DataSerializer out) throws HgIOException {
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183 for (int i = 0, x = data.size(); i < x; i++) {
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184 final int start = starts.get(i);
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185 final int end = ends.get(i);
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186 byte[] d = data.get(i);
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187 out.writeInt(start, end, d.length);
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188 out.write(d, 0, d.length);
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189 }
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190 }
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191
330
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192 private void add(Patch p, int i) {
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193 add(p.starts.get(i), p.ends.get(i), p.data.get(i));
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194 }
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195
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196 /*package-local*/ void add(int start, int end, byte[] d) {
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197 if (start == end && d.length == 0) {
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198 System.currentTimeMillis();
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199 return;
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200 }
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201 int last;
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202 if (shallNormalize && (last = starts.size()) > 0) {
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203 last--;
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204 if (ends.get(last) == start) {
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205 byte[] d1 = data.get(last);
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206 byte[] nd;
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207 if (d1.length > 0 && d.length > 0) {
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208 nd = new byte[d1.length + d.length];
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209 System.arraycopy(d1, 0, nd, 0, d1.length);
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210 System.arraycopy(d, 0, nd, d1.length, d.length);
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211 } else {
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212 nd = d1.length == 0 ? d : d1 ;
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213 }
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214 ends.set(last, end);
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215 data.set(last, nd);
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216 return;
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217 }
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218 // fall-through
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219 }
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220 starts.add(start);
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221 ends.add(end);
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222 data.add(d);
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223 }
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224
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225 // copies [start..end) bytes from the d
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226 private static byte[] subarray(byte[] d, int start, int end) {
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227 byte[] r = new byte[end-start];
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228 System.arraycopy(d, start, r, 0, r.length);
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229 return r;
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230 }
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231
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232 /**
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233 * Modify this patch with subsequent patch
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234 */
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235 public /*SHALL BE PUBLIC ONCE TESTING ENDS*/ Patch apply(Patch another) {
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236 Patch r = new Patch(count() + another.count() * 2, shallNormalize);
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237 int p1TotalAppliedDelta = 0; // value to add to start and end indexes of the older patch to get their values as if
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238 // in the patched text, iow, directly comparable with respective indexes from the newer patch.
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239 int p1EntryStart = 0, p1EntryEnd = 0, p1EntryLen = 0;
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240 byte[] p1Data = null;
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241 boolean insideP1entry = false;
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242 int p2 = 0, p1 = 0;
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243 final int p2Max = another.count(), p1Max = this.count();
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244 L0: for (; p2 < p2Max; p2++) {
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245 int p2EntryStart = another.starts.get(p2);
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246 int p2EntryEnd = another.ends.get(p2);
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247 final int p2EntryRange = p2EntryEnd - p2EntryStart;
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248 final byte[] p2Data = another.data.get(p2);
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249 boolean insideP2entry = false;
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250 // when we iterate p1 elements within single p2, we need to remember where p2
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251 // shall ultimately start in terms of p1
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252 int p2EntrySavedStart = -1;
330
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253 ///
329
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254
330
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255 L1: while (p1 < p1Max) {
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256 if (!insideP1entry) {
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257 p1EntryStart = starts.get(p1);
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258 p1EntryEnd = ends.get(p1);
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259 p1Data = data.get(p1);
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260 p1EntryLen = p1Data.length;
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261 }// else keep values
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262
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263 final int p1EntryDelta = p1EntryLen - (p1EntryEnd - p1EntryStart); // number of actually inserted(+) or deleted(-) chars
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264 final int p1EntryAppliedStart = p1TotalAppliedDelta + p1EntryStart;
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265 final int p1EntryAppliedEnd = p1EntryAppliedStart + p1EntryLen; // end of j'th patch entry in the text which is source for p2
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266
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267 if (insideP2entry) {
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268 if (p2EntryEnd <= p1EntryAppliedStart) {
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269 r.add(p2EntrySavedStart, p2EntryEnd - p1TotalAppliedDelta, p2Data);
330
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270 insideP2entry = false;
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271 continue L0;
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272 }
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273 if (p2EntryEnd >= p1EntryAppliedEnd) {
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274 // when p2EntryEnd == p1EntryAppliedEnd, I assume p1TotalAppliedDelta can't be used for p2EntryEnd to get it to p1 range, but rather shall be
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275 // augmented with current p1 entry and at the next p1 entry (likely to hit p1EntryAppliedStart > p2EntryEnd above) would do the rest
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276 insideP1entry = false;
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277 p1++;
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278 p1TotalAppliedDelta += p1EntryDelta;
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279 continue L1;
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280 }
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281 // p1EntryAppliedStart < p2EntryEnd < p1EntryAppliedEnd
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282 // can add up to p1EntryEnd here (not only to p1EntryStart), but decided
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283 // to leave p1 intact here, to avoid delta/range recalculation
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284 r.add(p2EntrySavedStart, p1EntryStart, p2Data);
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285 // consume part of p1 overlapped by current p2
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286 final int p1DataPartShift = p2EntryEnd - p1EntryAppliedStart;
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287 // p2EntryEnd < p1EntryAppliedEnd ==> p2EntryEnd < p1EntryAppliedStart + p1EntryLen
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288 // ==> p2EntryEnd - p1EntryAppliedStart < p1EntryLen
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289 assert p1DataPartShift < p1EntryLen;
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290 p1EntryLen -= p1DataPartShift;
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291 p1Data = subarray(p1Data, p1DataPartShift, p1Data.length);
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292 p1TotalAppliedDelta += p1DataPartShift;
330
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293 insideP1entry = true;
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294 insideP2entry = false;
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295 continue L0;
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296 }
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297
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298 if (p1EntryAppliedStart < p2EntryStart) {
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299 if (p1EntryAppliedEnd <= p2EntryStart) { // p1EntryAppliedEnd in fact index of the first char *after* patch
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300 // completely independent, copy and continue
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301 r.add(p1EntryStart, p1EntryEnd, p1Data);
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302 insideP1entry = false;
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303 p1++;
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304 // fall-through to get p1TotalAppliedDelta incremented
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305 } else { // SKETCH: II or III - p2 start inside p1 range
330
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306 // remember, p1EntryDelta may be negative
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307 // shall break j'th entry into few
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308 // fix p1's end/length
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309 // p1EntryAppliedStart < p2EntryStart < p1EntryAppliedEnd, or, alternatively
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310 // p2EntryStart is from (p1EntryAppliedStart .. p1EntryAppliedStart + p1EntryLen)
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311 int p1DataPartEnd = p2EntryStart - p1EntryAppliedStart;
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312 assert p1DataPartEnd < p1EntryLen;
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313 r.add(p1EntryStart, p1EntryEnd, subarray(p1Data, 0, p1DataPartEnd));
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314 if (p2EntryEnd <= p1EntryAppliedEnd) { // p2 fits completely into p1
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315 r.add(p1EntryEnd, p1EntryEnd, p2Data);
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316 // p2 consumed, p1 has p1EntryLen - p1DataPartEnd - p2EntryRange bytes left to *insert*
330
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317 insideP1entry = true;
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318 p1EntryStart = p1EntryEnd;
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319 p1EntryLen -= p1DataPartEnd;
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320 p1EntryLen -= p2EntryRange;
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321 // p2EntryEnd <= p1EntryAppliedEnd ==> p2EntryEnd <= p1EntryAppliedStart + p1EntryLen
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322 // -p2EntryStart ==> p2EntryRange <= p1EntryAppliedStart-p2EntryStart + p1EntryLen
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diff changeset
323 // p1EntryAppliedStart-p2EntryStart = -p1DataPartEnd ==> p2EntryRange <= p1EntryLen - p1DataEndPart
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diff changeset
324 // +p1DataEndPart ==> p2EntryRange + p1DataEndPart <= p1EntryLen
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diff changeset
325 assert p1EntryLen >= 0;
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326 // p1EntryLen==0 with insideP1entry == true is nor really good here (gives empty patch elements x;x;0),
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327 // however changing <= to < in p2EntryEnd <= p1EntryAppliedEnd above leads to errors
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328 p1Data = subarray(p1Data, p1DataPartEnd+p2EntryRange, p1Data.length);
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diff changeset
329 // augment total delta with p1EntryDelta part already consumed (p1EntryLen is pure insertion left for the next step)
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330 p1TotalAppliedDelta += (p1EntryDelta - p1EntryLen);
330
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diff changeset
331 continue L0;
583
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332 } else {
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333 // p1 is consumed, take next
330
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334 insideP1entry = false;
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335 p1++;
583
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336 insideP2entry = true;
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337 p2EntrySavedStart = p1EntryEnd; // this is how far we've progressed in p1
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diff changeset
338 // fall-through to get p1TotalAppliedDelta updated with consumed p1
330
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diff changeset
339 }
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340 }
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341 } else { // p1EntryAppliedStart >= p2EntryStart
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diff changeset
342 if (p2EntryEnd < p1EntryAppliedStart) {
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diff changeset
343 // newer patch completely fits between two older patches
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diff changeset
344 r.add(p2EntryStart - p1TotalAppliedDelta, p2EntryEnd - p1TotalAppliedDelta, p2Data);
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parents: 329
diff changeset
345 // SHALL NOT increment p1TotalAppliedDelta as we didn't use any of p1
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diff changeset
346 continue L0; // next p2
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347 } else { // p2EntryEnd >= p1EntryAppliedStart
583
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diff changeset
348 // SKETCH: I or IV:
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349 // p2 start is outside of p1 range.
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350 //
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351 // p2DataPartEnd: this is how many bytes prior to p1EntryStart is replaced by p2Data
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diff changeset
352 int p2DataPartEnd = p1EntryAppliedStart - p2EntryStart;
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diff changeset
353 if (p2EntryEnd < p1EntryAppliedEnd) {
330
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parents: 329
diff changeset
354 // SKETCH: I: copy p2, strip p1 to start from p2EntryEnd, next i (p2)
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diff changeset
355 insideP1entry = true;
583
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diff changeset
356 // replace whole p1 (extended to the left by (p2 \ p1) front bytes)
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parents: 534
diff changeset
357 r.add(p1EntryStart - p2DataPartEnd, p1EntryEnd, p2Data);
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diff changeset
358 p1EntryStart = p1EntryEnd;
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diff changeset
359 // see how much of p1 is left for insertion
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diff changeset
360 int p1DataPartEnd = p2EntryEnd - p1EntryAppliedStart; // #1
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parents: 534
diff changeset
361 // Similar, although incorrect: p1DataPartEnd == p2Data.length - p2DataPartEnd; // #2
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parents: 534
diff changeset
362 // #1(p2EntryStart + p2DataLen) - p1EntryAppliedStart
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parents: 534
diff changeset
363 // #2 p2DataLen - (p1EntryAppliedStart - p2EntryStart)
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parents: 534
diff changeset
364 // but this works only in assumption that p2EntryEnd-p2EntryStart == p2Data.length
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diff changeset
365 //
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diff changeset
366 // p1EntryAppliedStart <= p2EntryEnd < p1EntryAppliedStart + p1EntryLen
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parents: 534
diff changeset
367 // -p1EntryAppliedStart (to compare against p1DataPartEnd) ==> 0 <= p1DataPartEnd < p1EntryLen
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diff changeset
368 assert p1DataPartEnd < p1EntryLen;
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diff changeset
369 assert p1DataPartEnd >= 0;
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diff changeset
370 p1EntryLen -= p1DataPartEnd;
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diff changeset
371 p1Data = subarray(p1Data, p1DataPartEnd, p1Data.length);
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diff changeset
372
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diff changeset
373 // p1TotalAppliedDelta XXX
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diff changeset
374 p1TotalAppliedDelta += (p1EntryDelta - p1EntryLen);
330
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parents: 329
diff changeset
375 continue L0; // next p2;
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diff changeset
376 } else {
583
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diff changeset
377 // p2EntryEnd >= p1EntryAppliedEnd
330
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diff changeset
378 // SKETCH IV: skip (rest of) p1 completely, continue the same unless found p1 with start or end past p2EntryEnd.
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diff changeset
379 insideP1entry = false;
583
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diff changeset
380 // p1 consumed
330
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diff changeset
381 p1++;
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diff changeset
382 insideP2entry = true;
583
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parents: 534
diff changeset
383 // extend to the left of p1 by p2 \ p1 front bytes
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parents: 534
diff changeset
384 p2EntrySavedStart = p1EntryStart - p2DataPartEnd;
330
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parents: 329
diff changeset
385 // fall-through to get p1TotalAppliedDelta incremented
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386 }
329
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387 }
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388 }
330
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389 p1TotalAppliedDelta += p1EntryDelta;
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390 } // while (p1 < p1Max)
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391 {
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392 // no more p1 entries, shall close p2 (if it's handled, code above jumps directly to L0)
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393 // regardless of whether insideP2 is .t
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394 int s = p2EntrySavedStart != -1 ? p2EntrySavedStart : p2EntryStart - p1TotalAppliedDelta;
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395 // p2EntrySavedStart != -1 when we started p2 entry processing, but not completed
330
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396 // if we handled last p1 entry but didn't start with p2 entry processing, it's -1 and regular p1 delta shall be used
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397 r.add(s, p2EntryEnd - p1TotalAppliedDelta, p2Data);
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398 }
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399 }
330
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400 if (p1 < p1Max && insideP1entry) {
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401 r.add(p1EntryStart, p1EntryEnd, p1Data);
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402 p1++;
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403 }
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404 while (p1 < p1Max) {
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405 r.add(this, p1);
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406 p1++;
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407 };
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408 return r;
329
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409 }
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410
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411 /**
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412 * Combine consecutive regions into one.
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413 * XXX NOW only combines two subsequent regions, seems enough for quick test
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414 * @return <code>this</code> or new instance of consecutive regions found
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415 */
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416 public Patch normalize() {
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417 Patch rv = null;
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418 for (int i = 1, x = data.size(); i < x; i++) {
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419 if (starts.get(i) == ends.get(i-1)) {
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420 if (rv == null) {
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421 rv = new Patch();
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422 rv.copyOf(this, 0, i-1);
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423 // } else if (ends.get(i-1) == rv.ends.get(rv.ends.size()-1)) {
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424 // // "JUST IN CASE" code, i++ below prevents us from getting here
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425 // // if the last region is the one already merged,
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426 // // ignore this occurrence (otherwise data(i-1) would get copied again)
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427 // continue;
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428 }
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429 byte[] d1 = data.get(i-1);
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430 byte[] d = data.get(i);
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431 byte[] nd;
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432 if (d1.length > 0 && d.length > 0) {
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433 nd = new byte[d1.length + d.length];
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434 System.arraycopy(d1, 0, nd, 0, d1.length);
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435 System.arraycopy(d, 0, nd, d1.length, d.length);
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436 } else {
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437 nd = d1.length == 0 ? d : d1 ;
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438 }
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439 rv.add(starts.get(i-1), ends.get(i), nd);
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440 i++; // skip i-th element (effectively means we detect only pairs)
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441 // without this ++, element(i-1) is added to rv once "else" below is hit on the next step
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442 } else {
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443 if (rv != null) {
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444 rv.add(this, i-1);
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445 }
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446 }
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447 }
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448 if (rv == null) {
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449 return this;
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450 } else {
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451 int last = count() - 1;
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452 if (starts.get(last) != ends.get(last-1)) {
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453 rv.add(this, last);
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454 }
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455 }
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456 return rv;
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457 }
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458
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459 private void copyOf(Patch another, int fromIndex, int upToIndex) {
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460 while(fromIndex < upToIndex) {
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461 add(another, fromIndex++);
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462 }
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463 }
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464
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465 public class PatchDataSource implements DataSerializer.DataSource {
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466
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467 public void serialize(DataSerializer out) throws HgIOException {
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468 Patch.this.serialize(out);
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469 }
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470
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471 public int serializeLength() {
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472 return Patch.this.serializedLength();
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473 }
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474 }
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475 }