Mercurial > hg4j

annotate src/org/tmatesoft/hg/internal/Patch.java @ 515:e6c8b9b654b2

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Provide access to HgDataFile being iterated into HgChangesetTreeHandler.TreeElement to give context for renamed files
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Mon, 17 Dec 2012 20:51:12 +0100
parents 6c22bdc0bdfd
children 0f6fa88e2162
rev   line source
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1 /*
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2 * Copyright (c) 2011-2012 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 /**
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24 * @see http://mercurial.selenic.com/wiki/BundleFormat
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25 * in Changelog group description
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26 *
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27 * range [start..end] in original source gets replaced with data of length (do not keep, use data.length instead)
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28 * range [end(i)..start(i+1)] is copied from the source
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29 *
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30 * @author Artem Tikhomirov
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31 * @author TMate Software Ltd.
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32 */
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33 public final class Patch {
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34 private final IntVector starts, ends;
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35 private final ArrayList<byte[]> data;
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36
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37 private static byte[] generate(int c) {
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38 byte[] rv = new byte[c];
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39 for (int i = 0; i < c; i++) {
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40 byte x = (byte) ('a' + i);
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41 rv[i] = x;
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42 }
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43 return rv;
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44 }
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45
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46 public static void main(String[] args) {
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47 Patch p1 = new Patch(), p2 = new Patch();
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48 // simple cases (one element in either patch)
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49 // 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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50 // II: (1,10,7) & (3,15,15) insideP2 = true and no more p1 entries
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51 // II: (1,1,10) & (3,11,15)
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52 // independent: (1,10,10) & (15,25,10); (15, 25, 10) & (1, 10, 10)
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53 // I: (15, 25, 10) & (10, 20, 10). result: [10, 20, 10] [20, 25, 5]
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54 // IV: (15, 25, 10) & (10, 30, 20)
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55 //
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56 // cycle with insideP2
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57 //
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58 // cycle with insideP1
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59 //
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60 // multiple elements in patches (offsets)
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61 p1.add(15, 25, generate(10));
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62 p2.add(10, 30, generate(20));
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63 System.out.println("p1: " + p1);
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64 System.out.println("p2: " + p2);
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65 Patch r = p1.apply(p2);
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66 System.out.println("r: " + r);
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67 }
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68
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69 public Patch() {
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70 starts = new IntVector();
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71 ends = new IntVector();
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72 data = new ArrayList<byte[]>();
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73 }
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74
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75 public String toString() {
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76 StringBuilder sb = new StringBuilder();
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77 Formatter f = new Formatter(sb);
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78 for (int i = 0; i < count(); i++) {
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79 f.format("[%d, %d, %d] ", starts.get(i), ends.get(i), data.get(i).length);
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80 }
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81 return sb.toString();
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82 }
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83
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84 public int count() {
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85 return data.size();
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86 }
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87
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88 // number of bytes this patch will add (or remove, if negative) from the base revision
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89 private int patchSizeDelta() {
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90 int rv = 0;
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91 int prevEnd = 0;
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92 for (int i = 0, x = data.size(); i < x; i++) {
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93 final int start = starts.get(i);
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94 final int len = data.get(i).length;
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95 rv += start - prevEnd; // would copy from original
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96 rv += len; // and add new
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97 prevEnd = ends.get(i);
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98 }
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99 rv -= prevEnd;
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100 return rv;
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101 }
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102
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103 public byte[] apply(DataAccess baseRevisionContent, int outcomeLen) throws IOException {
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104 if (outcomeLen == -1) {
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105 outcomeLen = baseRevisionContent.length() + patchSizeDelta();
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106 }
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107 int prevEnd = 0, destIndex = 0;
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108 byte[] rv = new byte[outcomeLen];
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109 for (int i = 0, x = data.size(); i < x; i++) {
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110 final int start = starts.get(i);
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111 baseRevisionContent.seek(prevEnd);
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112 // copy source bytes that were not modified (up to start of the record)
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113 baseRevisionContent.readBytes(rv, destIndex, start - prevEnd);
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114 destIndex += start - prevEnd;
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115 // insert new data from the patch, if any
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116 byte[] d = data.get(i);
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117 System.arraycopy(d, 0, rv, destIndex, d.length);
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118 destIndex += d.length;
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119 prevEnd = ends.get(i);
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120 }
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121 baseRevisionContent.seek(prevEnd);
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122 // copy everything in the source past last record's end
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123 baseRevisionContent.readBytes(rv, destIndex, (baseRevisionContent.length() - prevEnd));
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124 return rv;
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125 }
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126
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127 public void clear() {
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128 starts.clear();
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129 ends.clear();
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130 data.clear();
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131 }
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132
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133 /**
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134 * Initialize instance from stream. Any previous patch information (i.e. if instance if reused) is cleared first.
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135 * Read up to the end of DataAccess and interpret data as patch records.
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136 */
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137 public void read(DataAccess da) throws IOException {
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138 clear();
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139 while (!da.isEmpty()) {
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140 readOne(da);
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141 }
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142 }
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143
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144 /**
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145 * Caller is responsible to ensure stream got some data to read
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146 */
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147 public void readOne(DataAccess da) throws IOException {
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148 int s = da.readInt();
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149 int e = da.readInt();
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150 int len = da.readInt();
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151 byte[] src = new byte[len];
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152 da.readBytes(src, 0, len);
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153 starts.add(s);
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154 ends.add(e);
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155 data.add(src);
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156 }
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157
330
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158 private void add(Patch p, int i) {
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159 add(p.starts.get(i), p.ends.get(i), p.data.get(i));
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160 }
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161
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162 private void add(int start, int end, byte[] d) {
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163 starts.add(start);
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164 ends.add(end);
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165 data.add(d);
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166 }
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167
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168 private static byte[] subarray(byte[] d, int start, int end) {
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169 byte[] r = new byte[end-start+1];
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170 System.arraycopy(d, start, r, 0, r.length);
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171 return r;
329
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172 }
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173
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174 /**
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175 * Modify this patch with subsequent patch
330
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176 */
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177 private /*SHALL BE PUBLIC ONCE TESTING ENDS*/ Patch apply(Patch another) {
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178 Patch r = new Patch();
330
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179 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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180 // in the patched text, iow, directly comparable with respective indexes from the newer patch.
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181 int p1EntryStart = 0, p1EntryEnd = 0, p1EntryLen = 0;
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182 byte[] p1Data = null;
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183 boolean insideP1entry = false;
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184 int p2 = 0, p1 = 0;
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185 final int p2Max = another.count(), p1Max = this.count();
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186 L0: for (; p2 < p2Max; p2++) {
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187 int p2EntryStart = another.starts.get(p2);
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188 int p2EntryEnd = another.ends.get(p2);
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189 final int p2EntryRange = p2EntryEnd - p2EntryStart;
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190 final byte[] p2Data = another.data.get(p2);
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191 boolean insideP2entry = false;
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192 int p2EntryStartOffset = -1;
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193 ///
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194 p1EntryStart = p1EntryEnd = p1EntryLen = 0;
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195 p1Data = null;
329
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196
330
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197 L1: while (p1 < p1Max) {
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198 if (!insideP1entry) {
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199 p1EntryStart = starts.get(p1);
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200 p1EntryEnd = ends.get(p1);
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201 p1Data = data.get(p1);
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202 p1EntryLen = p1Data.length;
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203 }// else keep values
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204
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205 final int p1EntryDelta = p1EntryLen - (p1EntryEnd - p1EntryStart); // number of actually inserted(+) or deleted(-) chars
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206 final int p1EntryAppliedStart = p1TotalAppliedDelta + p1EntryStart;
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207 final int p1EntryAppliedEnd = p1EntryAppliedStart + p1EntryLen; // end of j'th patch entry in the text which is source for p2
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208
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209 if (insideP2entry) {
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210 if (p2EntryEnd < p1EntryAppliedStart) {
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211 r.add(p2EntryStart - p2EntryStartOffset, p2EntryEnd - p1TotalAppliedDelta, p2Data);
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212 insideP2entry = false;
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213 continue L0;
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214 }
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215 if (p2EntryEnd >= p1EntryAppliedEnd) {
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216 // 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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217 // 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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218 insideP1entry = false;
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219 p1++;
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220 p1TotalAppliedDelta += p1EntryDelta;
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221 continue L1;
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222 }
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223 // p1EntryAppliedStart <= p2EntryEnd < p1EntryAppliedEnd
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224 r.add(p2EntryStart - p2EntryStartOffset, p2EntryEnd - p1TotalAppliedDelta, p2Data);
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225 p1EntryStart = p2EntryEnd - p1TotalAppliedDelta;
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226 final int p1DataPartShift = p2EntryEnd - p1EntryAppliedStart + 1;
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227 if (p1DataPartShift >= p1EntryLen) {
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228 p1EntryLen = 0;
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229 p1Data = new byte[0];
329
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230 } else {
330
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231 p1EntryLen -= p1DataPartShift;
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232 p1Data = subarray(p1Data, p1DataPartShift, p1Data.length);
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233 }
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234 insideP1entry = true;
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235 insideP2entry = false;
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236 continue L0;
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237 }
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238
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239 if (p1EntryAppliedStart < p2EntryStart) {
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240 if (p1EntryAppliedEnd <= p2EntryStart) { // p1EntryAppliedEnd in fact index of the first char *after* patch
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241 // completely independent, copy and continue
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242 r.add(p1EntryStart, p1EntryEnd, p1Data);
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243 insideP1entry = false;
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244 p1++;
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245 // fall-through to get p1TotalAppliedDelta incremented
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246 } else { // SKETCH: II or III
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247 // remember, p1EntryDelta may be negative
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248 // shall break j'th entry into few
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249 // fix p1's end/length
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250 // p1EntryAppliedStart < p2EntryStart < p1EntryAppliedEnd
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251 int s = p2EntryStart - p1TotalAppliedDelta; // p2EntryStart in p1 scale. Is within p1 range
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252 if (s > p1EntryEnd) {
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253 s = p1EntryEnd;
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254 }
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255 int p1DataPartEnd = p2EntryStart - p1EntryAppliedStart; // index, not count. <= (p1EntryEnd-p1EntryStart).
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256 // add what left from p1
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257 if (p1DataPartEnd < p1EntryLen) {
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258 r.add(p1EntryStart, s, subarray(p1Data, 0, p1DataPartEnd));
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259 } else {
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260 p1DataPartEnd = p1EntryLen-1; // record factual number of p1 bytes we consumed.
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261 r.add(p1EntryStart, s, p1Data);
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262 }
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263 p1TotalAppliedDelta += p1DataPartEnd - (s - p1EntryStart); // (s2 - (s1+delta)) - (s2 - delta - s1) = s2-s1-delta-s2+delta+s1 = 0, unless p1DataPartEnd >= p1Data.length
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264 p1EntryLen -= (p1DataPartEnd+1);
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265 if (p2EntryEnd < p1EntryAppliedEnd) {
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266 // SKETCH: III
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267 insideP1entry = true;
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268 // p2 completely fits into changes of p1
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269 int e = p2EntryEnd - p1TotalAppliedDelta; // p2EntryEnd in p1 scale
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270 if (e > p1EntryEnd) {
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271 // any index past p1 end shall be calculated with respect to p1 end, thus it's unsafe to go past p1 end (there may be more p1 entries there)
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272 e = p1EntryEnd;
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273 }
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274 r.add(s, e, p2Data); // add p2
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275 // modify p1 leftover
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276 p1EntryStart = e;
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277 if (p2EntryRange >= p1EntryLen) {
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278 p1EntryLen = 0;
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279 p1Data = new byte[0];
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280 } else {
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281 p1Data = subarray(p1Data, p1DataPartEnd + p2EntryRange, p1Data.length-1 /*up to the last one*/);
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282 p1EntryLen -= p2EntryRange;
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283 }
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284 // p2 is handled, but there are leftovers of p1
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285 continue L0;
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286 } else { // p2EntryEnd >= p1EntryAppliedEnd
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287 // SKETCH: II
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288 insideP1entry = false;
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289 p1++;
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290 if (p1EntryAppliedStart + p1EntryDelta >= p2EntryEnd) {
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291 // here we know next p1 entry would be past p2 entry and thus can put p2 right away
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292 r.add(p2EntryStart - p1TotalAppliedDelta, p1EntryEnd, p2Data);
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293 p1TotalAppliedDelta += p1EntryDelta;
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294 continue L0;
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295 } else {
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296 // there are chances there are more p1 entries till p2 ends
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297 insideP2entry = true;
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298 p2EntryStartOffset = p1TotalAppliedDelta;
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299 // p2EntryEnd is past delta, no chances for p1Data leftovers to be in use
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300 // p2 processing is not over, need to fix end, depending on what else fits into p2 range (if nothing, can put p2.end right away)
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301 // fall-through to get p1TotalAppliedDelta incremented;
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302 }
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303 }
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304 }
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305 } else { // p1EntryAppliedStart >= p2EntryStart
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306 if (p2EntryEnd < p1EntryAppliedStart) {
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307 // newer patch completely fits between two older patches
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308 r.add(p2EntryStart - p1TotalAppliedDelta, p2EntryEnd - p1TotalAppliedDelta, p2Data);
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309 // SHALL NOT increment p1TotalAppliedDelta as we didn't use any of p1
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310 continue L0; // next p2
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311 } else { // p2EntryEnd >= p1EntryAppliedStart
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312 // SKETCH: I or IV
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313 // p2EntryEnd is either < p1EntryAppliedEnd or past it
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diff changeset
314 if (p2EntryEnd <= p1EntryAppliedEnd) {
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diff changeset
315 // SKETCH: I: copy p2, strip p1 to start from p2EntryEnd, next i (p2)
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316 insideP1entry = true;
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317 int e = p2EntryEnd - p1TotalAppliedDelta;
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318 if (e > p1EntryEnd) {
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diff changeset
319 e = p1EntryEnd; // added by analogy with above. Is needed?
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320 }
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321 r.add(p2EntryStart - p1TotalAppliedDelta, e, p2Data);
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322 p1EntryStart = e;
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323 int p1DataShift = p2EntryEnd - p1EntryAppliedStart;
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diff changeset
324 if (p1DataShift >= p1EntryLen) {
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325 p1EntryLen = 0;
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326 p1Data = new byte[0];
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327 } else {
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328 p1EntryLen -= p1DataShift;
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diff changeset
329 p1Data = subarray(p1Data, p1DataShift, p1Data.length - 1);
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diff changeset
330 }
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331 // p1TotalAppliedDelta would get incremented once this modified p1 is handled
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diff changeset
332 continue L0; // next p2;
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333 } else {
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334 // p2EntryEnd > p1EntryAppliedEnd
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diff changeset
335 // SKETCH IV: skip (rest of) p1 completely, continue the same unless found p1 with start or end past p2EntryEnd.
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336 insideP1entry = false;
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337 p1++;
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338 insideP2entry = true;
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339 p2EntryStartOffset = p1TotalAppliedDelta;
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diff changeset
340 // fall-through to get p1TotalAppliedDelta incremented
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341 }
329
694ebabb5cb3 Refactor revlog patch mechanism, towards patch merging
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342 }
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343 }
330
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344 p1TotalAppliedDelta += p1EntryDelta;
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345 } // while (p1 < p1Max)
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346 {
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diff changeset
347 // no more p1 entries, shall close p2 (if it's handled, code above jumps directly to L0)
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diff changeset
348 // regardless of whether insideP2 is .t
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349 int s = p2EntryStart;
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diff changeset
350 // p2EntryStartOffset != -1 when we started p2 entry processing, but not completed
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diff changeset
351 // 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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diff changeset
352 s -= p2EntryStartOffset == -1 ? p1TotalAppliedDelta : p2EntryStartOffset;
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diff changeset
353 r.add(s, p2EntryEnd - p1TotalAppliedDelta, p2Data);
329
694ebabb5cb3 Refactor revlog patch mechanism, towards patch merging
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354 }
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355 }
330
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diff changeset
356 if (p1 < p1Max && insideP1entry) {
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diff changeset
357 r.add(p1EntryStart, p1EntryEnd, p1Data);
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diff changeset
358 p1++;
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359 }
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diff changeset
360 while (p1 < p1Max) {
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diff changeset
361 r.add(this, p1);
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362 p1++;
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363 };
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364 return r;
329
694ebabb5cb3 Refactor revlog patch mechanism, towards patch merging
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365 }
694ebabb5cb3 Refactor revlog patch mechanism, towards patch merging
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366 }