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comparison src/org/tmatesoft/hg/internal/RangePairSeq.java @ 674:cce0387c6041

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Introduced dedicated IntSliceSeq/IntTuple in place of IntArray with subsequences
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 17 Jul 2013 15:40:51 +0200
parents src/org/tmatesoft/hg/internal/RangeSeq.java@d3c71498919c
children
comparison
equal deleted inserted replaced
673:545b1d4cc11d 674:cce0387c6041
1 /*
2 * Copyright (c) 2013 TMate Software Ltd
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; version 2 of the License.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * For information on how to redistribute this software under
14 * the terms of a license other than GNU General Public License
15 * contact TMate Software at support@hg4j.com
16 */
17 package org.tmatesoft.hg.internal;
18
19 import java.util.Formatter;
20
21 /**
22 * Sequence of range pairs (denoted origin and target), {originStart, targetStart, length}, tailored for diff/annotate
23 *
24 * @author Artem Tikhomirov
25 * @author TMate Software Ltd.
26 */
27 public final class RangePairSeq {
28 private final IntSliceSeq ranges = new IntSliceSeq(3);
29
30 public void add(int start1, int start2, int length) {
31 int count = ranges.size();
32 if (count > 0) {
33 int lastS1 = ranges.get(--count, 0);
34 int lastS2 = ranges.get(count, 1);
35 int lastLen = ranges.get(count, 2);
36 if (start1 == lastS1 + lastLen && start2 == lastS2 + lastLen) {
37 // new range continues the previous one - just increase the length
38 ranges.set(count, lastS1, lastS2, lastLen + length);
39 return;
40 }
41 }
42 ranges.add(start1, start2, length);
43 }
44
45 public void clear() {
46 ranges.clear();
47 }
48
49 public int size() {
50 return ranges.size();
51 }
52
53 /**
54 * find out line index in the target that matches specified origin line
55 */
56 public int mapLineIndex(int ln) {
57 for (IntTuple t : ranges) {
58 int s1 = t.at(0);
59 if (s1 > ln) {
60 return -1;
61 }
62 int l = t.at(2);
63 if (s1 + l > ln) {
64 int s2 = t.at(1);
65 return s2 + (ln - s1);
66 }
67 }
68 return -1;
69 }
70
71 /**
72 * find out line index in origin that matches specified target line
73 */
74 public int reverseMapLine(int targetLine) {
75 for (IntTuple t : ranges) {
76 int ts = t.at(1);
77 if (ts > targetLine) {
78 return -1;
79 }
80 int l = t.at(2);
81 if (ts + l > targetLine) {
82 int os = t.at(0);
83 return os + (targetLine - ts);
84 }
85 }
86 return -1;
87 }
88
89 public RangePairSeq intersect(RangePairSeq target) {
90 RangePairSeq v = new RangePairSeq();
91 for (IntTuple t : ranges) {
92 int originLine = t.at(0);
93 int targetLine = t.at(1);
94 int length = t.at(2);
95 int startTargetLine = -1, startOriginLine = -1, c = 0;
96 for (int j = 0; j < length; j++) {
97 int lnInFinal = target.mapLineIndex(targetLine + j);
98 if (lnInFinal == -1 || (startTargetLine != -1 && lnInFinal != startTargetLine + c)) {
99 // the line is not among "same" in ultimate origin
100 // or belongs to another/next "same" chunk
101 if (startOriginLine == -1) {
102 continue;
103 }
104 v.add(startOriginLine, startTargetLine, c);
105 c = 0;
106 startOriginLine = startTargetLine = -1;
107 // fall-through to check if it's not complete miss but a next chunk
108 }
109 if (lnInFinal != -1) {
110 if (startOriginLine == -1) {
111 startOriginLine = originLine + j;
112 startTargetLine = lnInFinal;
113 c = 1;
114 } else {
115 // lnInFinal != startTargetLine + s is covered above
116 assert lnInFinal == startTargetLine + c;
117 c++;
118 }
119 }
120 }
121 if (startOriginLine != -1) {
122 assert c > 0;
123 v.add(startOriginLine, startTargetLine, c);
124 }
125 }
126 return v;
127 }
128
129 // true when specified line in origin is equal to a line in target
130 public boolean includesOriginLine(int ln) {
131 return includes(ln, 0);
132 }
133
134 // true when specified line in target is equal to a line in origin
135 public boolean includesTargetLine(int ln) {
136 return includes(ln, 1);
137 }
138
139 private boolean includes(int ln, int o) {
140 for (IntTuple t : ranges) {
141 int rangeStart = t.at(o);
142 if (rangeStart > ln) {
143 return false;
144 }
145 int rangeLen = t.at(2);
146 if (rangeStart + rangeLen > ln) {
147 return true;
148 }
149 }
150 return false;
151 }
152
153 public CharSequence dump() {
154 StringBuilder sb = new StringBuilder();
155 Formatter f = new Formatter(sb);
156 for (IntTuple t : ranges) {
157 int s1 = t.at(0);
158 int s2 = t.at(1);
159 int len = t.at(2);
160 f.format("[%d..%d) == [%d..%d); ", s1, s1 + len, s2, s2 + len);
161 }
162 return sb;
163 }
164
165 @Override
166 public String toString() {
167 return String.format("RangeSeq[%d]:%s", size(), dump());
168 }
169 }