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annotate src/org/tmatesoft/hg/internal/Patch.java @ 680:58a6900f845d

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Blame: alternative strategy to handle merge revisions: map(diff(p1->base->p2)) to understand merge intentions better
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sun, 21 Jul 2013 17:15:34 +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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323 // p1EntryAppliedStart-p2EntryStart = -p1DataPartEnd ==> p2EntryRange <= p1EntryLen - p1DataEndPart
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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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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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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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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 }
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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
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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 }
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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;
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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 }