Mercurial > jhg

annotate src/org/tmatesoft/hg/internal/diff/RangePairSeq.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 7839ff0bfd78
children
rev   line source
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1 /*
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2 * Copyright (c) 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.diff;
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18
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19 import java.util.Formatter;
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20
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21 import org.tmatesoft.hg.internal.IntSliceSeq;
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22 import org.tmatesoft.hg.internal.IntTuple;
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23
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24 /**
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25 * Sequence of range pairs (denoted origin and target), {originStart, targetStart, length}, tailored for diff/annotate
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26 *
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27 * @author Artem Tikhomirov
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28 * @author TMate Software Ltd.
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29 */
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30 public final class RangePairSeq {
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31 private final IntSliceSeq ranges = new IntSliceSeq(3);
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32
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33 public void add(int start1, int start2, int length) {
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34 int count = ranges.size();
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35 if (count > 0) {
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36 int lastS1 = ranges.get(--count, 0);
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37 int lastS2 = ranges.get(count, 1);
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38 int lastLen = ranges.get(count, 2);
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39 if (start1 == lastS1 + lastLen && start2 == lastS2 + lastLen) {
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40 // new range continues the previous one - just increase the length
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41 ranges.set(count, lastS1, lastS2, lastLen + length);
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42 return;
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43 }
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44 }
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45 ranges.add(start1, start2, length);
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46 }
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47
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48 public void clear() {
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49 ranges.clear();
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50 }
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51
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52 public int size() {
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53 return ranges.size();
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54 }
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55
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56 /**
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57 * find out line index in the target that matches specified origin line
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58 */
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59 public int mapLineIndex(int ln) {
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60 for (IntTuple t : ranges) {
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61 int s1 = t.at(0);
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62 if (s1 > ln) {
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63 return -1;
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64 }
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65 int l = t.at(2);
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66 if (s1 + l > ln) {
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67 int s2 = t.at(1);
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68 return s2 + (ln - s1);
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69 }
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70 }
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71 return -1;
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72 }
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73
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74 /**
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75 * find out line index in origin that matches specified target line
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76 */
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77 public int reverseMapLine(int targetLine) {
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78 for (IntTuple t : ranges) {
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79 int ts = t.at(1);
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80 if (ts > targetLine) {
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81 return -1;
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82 }
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83 int l = t.at(2);
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84 if (ts + l > targetLine) {
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85 int os = t.at(0);
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86 return os + (targetLine - ts);
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87 }
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88 }
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89 return -1;
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90 }
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91
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92 public RangePairSeq intersect(RangePairSeq target) {
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93 RangePairSeq v = new RangePairSeq();
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94 for (IntTuple t : ranges) {
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95 int originLine = t.at(0);
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96 int targetLine = t.at(1);
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97 int length = t.at(2);
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98 int startTargetLine = -1, startOriginLine = -1, c = 0;
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99 for (int j = 0; j < length; j++) {
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100 int lnInFinal = target.mapLineIndex(targetLine + j);
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101 if (lnInFinal == -1 || (startTargetLine != -1 && lnInFinal != startTargetLine + c)) {
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102 // the line is not among "same" in ultimate origin
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103 // or belongs to another/next "same" chunk
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104 if (startOriginLine == -1) {
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105 continue;
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106 }
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107 v.add(startOriginLine, startTargetLine, c);
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108 c = 0;
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109 startOriginLine = startTargetLine = -1;
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110 // fall-through to check if it's not complete miss but a next chunk
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111 }
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112 if (lnInFinal != -1) {
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113 if (startOriginLine == -1) {
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114 startOriginLine = originLine + j;
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115 startTargetLine = lnInFinal;
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116 c = 1;
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117 } else {
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118 // lnInFinal != startTargetLine + s is covered above
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119 assert lnInFinal == startTargetLine + c;
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120 c++;
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121 }
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122 }
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123 }
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124 if (startOriginLine != -1) {
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125 assert c > 0;
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126 v.add(startOriginLine, startTargetLine, c);
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127 }
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128 }
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129 return v;
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130 }
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131
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132 // true when specified line in origin is equal to a line in target
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133 public boolean includesOriginLine(int ln) {
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134 return includes(ln, 0);
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135 }
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136
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137 // true when specified line in target is equal to a line in origin
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138 public boolean includesTargetLine(int ln) {
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139 return includes(ln, 1);
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140 }
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141
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142 private boolean includes(int ln, int o) {
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143 for (IntTuple t : ranges) {
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144 int rangeStart = t.at(o);
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145 if (rangeStart > ln) {
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146 return false;
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147 }
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148 int rangeLen = t.at(2);
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149 if (rangeStart + rangeLen > ln) {
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150 return true;
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151 }
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152 }
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153 return false;
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154 }
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155
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156 public CharSequence dump() {
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157 StringBuilder sb = new StringBuilder();
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158 Formatter f = new Formatter(sb);
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159 for (IntTuple t : ranges) {
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160 int s1 = t.at(0);
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161 int s2 = t.at(1);
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162 int len = t.at(2);
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163 f.format("[%d..%d) == [%d..%d); ", s1, s1 + len, s2, s2 + len);
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164 }
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165 return sb;
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166 }
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167
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168 @Override
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169 public String toString() {
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170 return String.format("RangeSeq[%d]:%s", size(), dump());
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171 }
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172 }