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annotate src/org/tmatesoft/hg/internal/RangeSeq.java @ 558:154718ae23ed

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Annotate: refactor/reuse range handling code
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Mon, 25 Feb 2013 18:41:44 +0100
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children d3c71498919c
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154718ae23ed Annotate: refactor/reuse range handling code
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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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;
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18
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19 import java.util.Formatter;
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20
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21 /**
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22 * Sequence of range pairs (denoted origin and target), {originStart, targetStart, length}, tailored for diff/annotate
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23 *
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24 * @author Artem Tikhomirov
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25 * @author TMate Software Ltd.
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26 */
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27 public final class RangeSeq {
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28 // XXX smth like IntSliceVector to access triples (or slices of any size, in fact)
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29 // with easy indexing, e.g. #get(sliceIndex, indexWithinSlice)
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30 // and vect.get(7,2) instead of vect.get(7*SIZEOF_SLICE+2)
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31 private final IntVector ranges = new IntVector(3*10, 3*5);
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32 private int count;
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33
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34 public void add(int start1, int start2, int length) {
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35 if (count > 0) {
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36 int lastIndex = 3 * (count-1);
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37 int lastS1 = ranges.get(lastIndex);
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38 int lastS2 = ranges.get(lastIndex + 1);
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39 int lastLen = ranges.get(lastIndex + 2);
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40 if (start1 == lastS1 + lastLen && start2 == lastS2 + lastLen) {
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41 // new range continues the previous one - just increase the length
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42 ranges.set(lastIndex + 2, lastLen + length);
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43 return;
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44 }
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45 }
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46 ranges.add(start1, start2, length);
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47 count++;
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48 }
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49
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50 public void clear() {
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51 ranges.clear();
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52 count = 0;
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53 }
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54
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55 public int size() {
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56 return count;
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57 }
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58
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59 /**
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60 * find out line index in the target that matches specified origin line
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61 */
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62 public int mapLineIndex(int ln) {
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63 for (int i = 0; i < ranges.size(); i += 3) {
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64 int s1 = ranges.get(i);
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65 if (s1 > ln) {
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66 return -1;
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67 }
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68 int l = ranges.get(i+2);
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69 if (s1 + l > ln) {
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70 int s2 = ranges.get(i + 1);
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71 return s2 + (ln - s1);
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72 }
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73 }
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74 return -1;
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75 }
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76
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77 /**
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78 * find out line index in origin that matches specified target line
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79 */
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80 public int reverseMapLine(int targetLine) {
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81 for (int i = 0; i < ranges.size(); i +=3) {
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82 int ts = ranges.get(i + 1);
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83 if (ts > targetLine) {
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84 return -1;
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85 }
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86 int l = ranges.get(i + 2);
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87 if (ts + l > targetLine) {
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88 int os = ranges.get(i);
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89 return os + (targetLine - ts);
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90 }
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91 }
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92 return -1;
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93 }
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94
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95 public RangeSeq intersect(RangeSeq target) {
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96 RangeSeq v = new RangeSeq();
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97 for (int i = 0; i < ranges.size(); i += 3) {
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98 int originLine = ranges.get(i);
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99 int targetLine = ranges.get(i + 1);
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100 int length = ranges.get(i + 2);
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101 int startTargetLine = -1, startOriginLine = -1, c = 0;
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102 for (int j = 0; j < length; j++) {
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103 int lnInFinal = target.mapLineIndex(targetLine + j);
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104 if (lnInFinal == -1 || (startTargetLine != -1 && lnInFinal != startTargetLine + c)) {
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105 // the line is not among "same" in ultimate origin
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106 // or belongs to another/next "same" chunk
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107 if (startOriginLine == -1) {
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108 continue;
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109 }
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110 v.add(startOriginLine, startTargetLine, c);
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111 c = 0;
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112 startOriginLine = startTargetLine = -1;
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113 // fall-through to check if it's not complete miss but a next chunk
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114 }
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115 if (lnInFinal != -1) {
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116 if (startOriginLine == -1) {
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117 startOriginLine = originLine + j;
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118 startTargetLine = lnInFinal;
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119 c = 1;
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120 } else {
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121 // lnInFinal != startTargetLine + s is covered above
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122 assert lnInFinal == startTargetLine + c;
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123 c++;
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124 }
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125 }
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126 }
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127 if (startOriginLine != -1) {
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128 assert c > 0;
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129 v.add(startOriginLine, startTargetLine, c);
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130 }
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131 }
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132 return v;
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133 }
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134
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135 // true when specified line in origin is equal to a line in target
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136 public boolean includesOriginLine(int ln) {
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137 return includes(ln, 0);
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138 }
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139
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140 // true when specified line in target is equal to a line in origin
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141 public boolean includesTargetLine(int ln) {
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142 return includes(ln, 1);
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143 }
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144
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145 private boolean includes(int ln, int o) {
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146 for (int i = 2; i < ranges.size(); o += 3, i+=3) {
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147 int rangeStart = ranges.get(o);
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148 if (rangeStart > ln) {
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149 return false;
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150 }
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151 int rangeLen = ranges.get(i);
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152 if (rangeStart + rangeLen > ln) {
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153 return true;
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154 }
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155 }
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156 return false;
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157 }
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158
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159 public CharSequence dump() {
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160 StringBuilder sb = new StringBuilder();
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161 Formatter f = new Formatter(sb);
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162 for (int i = 0; i < ranges.size(); i += 3) {
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163 int s1 = ranges.get(i);
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164 int s2 = ranges.get(i + 1);
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165 int len = ranges.get(i + 2);
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166 f.format("[%d..%d) == [%d..%d); ", s1, s1 + len, s2, s2 + len);
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167 }
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168 return sb;
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169 }
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170
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171 @Override
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172 public String toString() {
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173 return String.format("RangeSeq[%d]", count);
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174 }
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175 }