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Added tag v9.1.0429 for changeset 1912fb74683478f2de8709680a22df2551093fd7
author Christian Brabandt <cb@256bit.org>
date Tue, 21 May 2024 18:45:03 +0200
parents f84e5db372ea
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /*
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2 * LibXDiff by Davide Libenzi ( File Differential Library )
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3 * Copyright (C) 2003-2016 Davide Libenzi, Johannes E. Schindelin
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4 *
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5 * This library is free software; you can redistribute it and/or
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6 * modify it under the terms of the GNU Lesser General Public
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7 * License as published by the Free Software Foundation; either
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8 * version 2.1 of the License, or (at your option) any later version.
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9 *
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10 * This library is distributed in the hope that it will be useful,
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11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 * Lesser General Public License for more details.
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14 *
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15 * You should have received a copy of the GNU Lesser General Public
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16 * License along with this library; if not, see
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17 * <http://www.gnu.org/licenses/>.
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18 *
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19 * Davide Libenzi <davidel@xmailserver.org>
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20 *
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21 */
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22 #include "xinclude.h"
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23
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24 /*
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25 * The basic idea of patience diff is to find lines that are unique in
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26 * both files. These are intuitively the ones that we want to see as
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27 * common lines.
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28 *
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29 * The maximal ordered sequence of such line pairs (where ordered means
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30 * that the order in the sequence agrees with the order of the lines in
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31 * both files) naturally defines an initial set of common lines.
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32 *
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33 * Now, the algorithm tries to extend the set of common lines by growing
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34 * the line ranges where the files have identical lines.
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35 *
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36 * Between those common lines, the patience diff algorithm is applied
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37 * recursively, until no unique line pairs can be found; these line ranges
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38 * are handled by the well-known Myers algorithm.
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39 */
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40
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41 #define NON_UNIQUE ULONG_MAX
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42
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43 /*
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44 * This is a hash mapping from line hash to line numbers in the first and
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45 * second file.
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46 */
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47 struct hashmap {
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48 int nr, alloc;
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49 struct entry {
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50 unsigned long hash;
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51 /*
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52 * 0 = unused entry, 1 = first line, 2 = second, etc.
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53 * line2 is NON_UNIQUE if the line is not unique
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54 * in either the first or the second file.
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55 */
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56 unsigned long line1, line2;
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57 /*
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58 * "next" & "previous" are used for the longest common
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59 * sequence;
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60 * initially, "next" reflects only the order in file1.
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61 */
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62 struct entry *next, *previous;
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63
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64 /*
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65 * If 1, this entry can serve as an anchor. See
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66 * Documentation/diff-options.txt for more information.
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67 */
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68 unsigned anchor : 1;
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69 } *entries, *first, *last;
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70 /* were common records found? */
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71 unsigned long has_matches;
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72 xdfenv_t *env;
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73 xpparam_t const *xpp;
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74 };
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75
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76 static int is_anchor(xpparam_t const *xpp, const char *line)
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77 {
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78 int i;
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79 for (i = 0; i < (int)xpp->anchors_nr; i++) {
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80 if (!strncmp(line, xpp->anchors[i], strlen(xpp->anchors[i])))
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81 return 1;
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82 }
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83 return 0;
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84 }
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85
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86 /* The argument "pass" is 1 for the first file, 2 for the second. */
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87 static void insert_record(xpparam_t const *xpp, int line, struct hashmap *map,
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88 int pass)
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89 {
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90 xrecord_t **records = pass == 1 ?
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91 map->env->xdf1.recs : map->env->xdf2.recs;
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92 xrecord_t *record = records[line - 1];
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93 /*
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94 * After xdl_prepare_env() (or more precisely, due to
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95 * xdl_classify_record()), the "ha" member of the records (AKA lines)
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96 * is _not_ the hash anymore, but a linearized version of it. In
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97 * other words, the "ha" member is guaranteed to start with 0 and
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98 * the second record's ha can only be 0 or 1, etc.
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99 *
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100 * So we multiply ha by 2 in the hope that the hashing was
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101 * "unique enough".
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102 */
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103 int index = (int)((record->ha << 1) % map->alloc);
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104
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105 while (map->entries[index].line1) {
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106 if (map->entries[index].hash != record->ha) {
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107 if (++index >= map->alloc)
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108 index = 0;
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109 continue;
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110 }
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111 if (pass == 2)
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112 map->has_matches = 1;
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113 if (pass == 1 || map->entries[index].line2)
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114 map->entries[index].line2 = NON_UNIQUE;
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115 else
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116 map->entries[index].line2 = line;
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117 return;
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118 }
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119 if (pass == 2)
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120 return;
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121 map->entries[index].line1 = line;
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122 map->entries[index].hash = record->ha;
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123 map->entries[index].anchor = is_anchor(xpp, map->env->xdf1.recs[line - 1]->ptr);
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124 if (!map->first)
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125 map->first = map->entries + index;
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126 if (map->last) {
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127 map->last->next = map->entries + index;
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128 map->entries[index].previous = map->last;
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129 }
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130 map->last = map->entries + index;
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131 map->nr++;
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132 }
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133
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134 /*
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135 * This function has to be called for each recursion into the inter-hunk
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136 * parts, as previously non-unique lines can become unique when being
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137 * restricted to a smaller part of the files.
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138 *
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139 * It is assumed that env has been prepared using xdl_prepare().
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140 */
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141 static int fill_hashmap(xpparam_t const *xpp, xdfenv_t *env,
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142 struct hashmap *result,
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143 int line1, int count1, int line2, int count2)
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144 {
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145 result->xpp = xpp;
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146 result->env = env;
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147
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148 /* We know exactly how large we want the hash map */
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149 result->alloc = count1 * 2;
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150 if (!XDL_CALLOC_ARRAY(result->entries, result->alloc))
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151 return -1;
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152
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153 /* First, fill with entries from the first file */
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154 while (count1--)
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155 insert_record(xpp, line1++, result, 1);
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156
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157 /* Then search for matches in the second file */
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158 while (count2--)
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159 insert_record(xpp, line2++, result, 2);
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160
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161 return 0;
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162 }
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163
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164 /*
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165 * Find the longest sequence with a smaller last element (meaning a smaller
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166 * line2, as we construct the sequence with entries ordered by line1).
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167 */
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168 static int binary_search(struct entry **sequence, int longest,
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169 struct entry *entry)
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170 {
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171 int left = -1, right = longest;
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172
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173 while (left + 1 < right) {
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174 int middle = left + (right - left) / 2;
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175 /* by construction, no two entries can be equal */
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176 if (sequence[middle]->line2 > entry->line2)
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177 right = middle;
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178 else
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179 left = middle;
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180 }
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181 /* return the index in "sequence", _not_ the sequence length */
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182 return left;
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183 }
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184
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185 /*
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186 * The idea is to start with the list of common unique lines sorted by
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187 * the order in file1. For each of these pairs, the longest (partial)
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188 * sequence whose last element's line2 is smaller is determined.
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189 *
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190 * For efficiency, the sequences are kept in a list containing exactly one
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191 * item per sequence length: the sequence with the smallest last
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192 * element (in terms of line2).
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193 */
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194 static int find_longest_common_sequence(struct hashmap *map, struct entry **res)
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195 {
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196 struct entry **sequence;
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197 int longest = 0, i;
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198 struct entry *entry;
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199
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200 /*
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201 * If not -1, this entry in sequence must never be overridden.
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202 * Therefore, overriding entries before this has no effect, so
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203 * do not do that either.
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204 */
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205 int anchor_i = -1;
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206
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207 if (!XDL_ALLOC_ARRAY(sequence, map->nr))
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208 return -1;
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209
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210 for (entry = map->first; entry; entry = entry->next) {
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211 if (!entry->line2 || entry->line2 == NON_UNIQUE)
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212 continue;
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213 i = binary_search(sequence, longest, entry);
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214 entry->previous = i < 0 ? NULL : sequence[i];
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215 ++i;
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216 if (i <= anchor_i)
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217 continue;
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218 sequence[i] = entry;
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219 if (entry->anchor) {
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220 anchor_i = i;
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221 longest = anchor_i + 1;
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222 } else if (i == longest) {
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223 longest++;
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224 }
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225 }
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226
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227 /* No common unique lines were found */
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228 if (!longest) {
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229 *res = NULL;
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230 xdl_free(sequence);
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231 return 0;
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232 }
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233
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234 /* Iterate starting at the last element, adjusting the "next" members */
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235 entry = sequence[longest - 1];
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236 entry->next = NULL;
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237 while (entry->previous) {
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238 entry->previous->next = entry;
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239 entry = entry->previous;
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240 }
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241 *res = entry;
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242 xdl_free(sequence);
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243 return 0;
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244 }
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245
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246 static int match(struct hashmap *map, int line1, int line2)
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247 {
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248 xrecord_t *record1 = map->env->xdf1.recs[line1 - 1];
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249 xrecord_t *record2 = map->env->xdf2.recs[line2 - 1];
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250 return record1->ha == record2->ha;
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251 }
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252
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253 static int patience_diff(xpparam_t const *xpp, xdfenv_t *env,
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254 int line1, int count1, int line2, int count2);
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255
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
256 static int walk_common_sequence(struct hashmap *map, struct entry *first,
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
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parents:
diff changeset
257 int line1, int count1, int line2, int count2)
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
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parents:
diff changeset
258 {
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
259 int end1 = line1 + count1, end2 = line2 + count2;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
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parents:
diff changeset
260 int next1, next2;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
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parents:
diff changeset
261
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
262 for (;;) {
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d5142d87f898 patch 8.2.3390: included xdiff code is outdated
Bram Moolenaar <Bram@vim.org>
parents: 18802
diff changeset
263 /* Try to grow the line ranges of common lines */
14696
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
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parents:
diff changeset
264 if (first) {
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
265 next1 = first->line1;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
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diff changeset
266 next2 = first->line2;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
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parents:
diff changeset
267 while (next1 > line1 && next2 > line2 &&
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
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parents:
diff changeset
268 match(map, next1 - 1, next2 - 1)) {
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
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diff changeset
269 next1--;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
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diff changeset
270 next2--;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
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diff changeset
271 }
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
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parents:
diff changeset
272 } else {
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
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diff changeset
273 next1 = end1;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
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diff changeset
274 next2 = end2;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
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diff changeset
275 }
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
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diff changeset
276 while (line1 < next1 && line2 < next2 &&
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
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diff changeset
277 match(map, line1, line2)) {
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
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diff changeset
278 line1++;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
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diff changeset
279 line2++;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
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diff changeset
280 }
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
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diff changeset
281
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d5142d87f898 patch 8.2.3390: included xdiff code is outdated
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diff changeset
282 /* Recurse */
14696
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
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diff changeset
283 if (next1 > line1 || next2 > line2) {
32174
f84e5db372ea patch 9.0.1418: the included xdiff code is a bit outdated
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parents: 25709
diff changeset
284 if (patience_diff(map->xpp, map->env,
14696
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
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diff changeset
285 line1, next1 - line1,
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
286 line2, next2 - line2))
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
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diff changeset
287 return -1;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
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parents:
diff changeset
288 }
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
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diff changeset
289
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
290 if (!first)
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
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diff changeset
291 return 0;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
292
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
293 while (first->next &&
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
294 first->next->line1 == first->line1 + 1 &&
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
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parents:
diff changeset
295 first->next->line2 == first->line2 + 1)
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
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parents:
diff changeset
296 first = first->next;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
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diff changeset
297
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
298 line1 = first->line1 + 1;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
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diff changeset
299 line2 = first->line2 + 1;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
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parents:
diff changeset
300
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
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parents:
diff changeset
301 first = first->next;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
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parents:
diff changeset
302 }
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
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parents:
diff changeset
303 }
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
304
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
305 static int fall_back_to_classic_diff(struct hashmap *map,
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
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parents:
diff changeset
306 int line1, int count1, int line2, int count2)
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
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parents:
diff changeset
307 {
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
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parents:
diff changeset
308 xpparam_t xpp;
25709
d5142d87f898 patch 8.2.3390: included xdiff code is outdated
Bram Moolenaar <Bram@vim.org>
parents: 18802
diff changeset
309
d5142d87f898 patch 8.2.3390: included xdiff code is outdated
Bram Moolenaar <Bram@vim.org>
parents: 18802
diff changeset
310 memset(&xpp, 0, sizeof(xpp));
14696
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
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parents:
diff changeset
311 xpp.flags = map->xpp->flags & ~XDF_DIFF_ALGORITHM_MASK;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
312
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
313 return xdl_fall_back_diff(map->env, &xpp,
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
314 line1, count1, line2, count2);
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
315 }
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
316
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
317 /*
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
318 * Recursively find the longest common sequence of unique lines,
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
319 * and if none was found, ask xdl_do_diff() to do the job.
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
320 *
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
321 * This function assumes that env was prepared with xdl_prepare_env().
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
322 */
32174
f84e5db372ea patch 9.0.1418: the included xdiff code is a bit outdated
Bram Moolenaar <Bram@vim.org>
parents: 25709
diff changeset
323 static int patience_diff(xpparam_t const *xpp, xdfenv_t *env,
14696
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
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parents:
diff changeset
324 int line1, int count1, int line2, int count2)
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
325 {
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
326 struct hashmap map;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
327 struct entry *first;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
328 int result = 0;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
329
25709
d5142d87f898 patch 8.2.3390: included xdiff code is outdated
Bram Moolenaar <Bram@vim.org>
parents: 18802
diff changeset
330 /* trivial case: one side is empty */
14696
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
331 if (!count1) {
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
332 while(count2--)
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
333 env->xdf2.rchg[line2++ - 1] = 1;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
334 return 0;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
335 } else if (!count2) {
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
336 while(count1--)
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
337 env->xdf1.rchg[line1++ - 1] = 1;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
338 return 0;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
339 }
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
340
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
341 memset(&map, 0, sizeof(map));
32174
f84e5db372ea patch 9.0.1418: the included xdiff code is a bit outdated
Bram Moolenaar <Bram@vim.org>
parents: 25709
diff changeset
342 if (fill_hashmap(xpp, env, &map,
14696
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
343 line1, count1, line2, count2))
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
344 return -1;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
345
25709
d5142d87f898 patch 8.2.3390: included xdiff code is outdated
Bram Moolenaar <Bram@vim.org>
parents: 18802
diff changeset
346 /* are there any matching lines at all? */
14696
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
347 if (!map.has_matches) {
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
348 while(count1--)
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
349 env->xdf1.rchg[line1++ - 1] = 1;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
350 while(count2--)
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
351 env->xdf2.rchg[line2++ - 1] = 1;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
352 xdl_free(map.entries);
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
353 return 0;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
354 }
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
355
32174
f84e5db372ea patch 9.0.1418: the included xdiff code is a bit outdated
Bram Moolenaar <Bram@vim.org>
parents: 25709
diff changeset
356 result = find_longest_common_sequence(&map, &first);
f84e5db372ea patch 9.0.1418: the included xdiff code is a bit outdated
Bram Moolenaar <Bram@vim.org>
parents: 25709
diff changeset
357 if (result)
f84e5db372ea patch 9.0.1418: the included xdiff code is a bit outdated
Bram Moolenaar <Bram@vim.org>
parents: 25709
diff changeset
358 goto out;
14696
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
359 if (first)
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
360 result = walk_common_sequence(&map, first,
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
361 line1, count1, line2, count2);
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
362 else
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
363 result = fall_back_to_classic_diff(&map,
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
364 line1, count1, line2, count2);
32174
f84e5db372ea patch 9.0.1418: the included xdiff code is a bit outdated
Bram Moolenaar <Bram@vim.org>
parents: 25709
diff changeset
365 out:
14696
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
366 xdl_free(map.entries);
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
367 return result;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
368 }
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
369
32174
f84e5db372ea patch 9.0.1418: the included xdiff code is a bit outdated
Bram Moolenaar <Bram@vim.org>
parents: 25709
diff changeset
370 int xdl_do_patience_diff(xpparam_t const *xpp, xdfenv_t *env)
14696
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
371 {
32174
f84e5db372ea patch 9.0.1418: the included xdiff code is a bit outdated
Bram Moolenaar <Bram@vim.org>
parents: 25709
diff changeset
372 return patience_diff(xpp, env, 1, env->xdf1.nrec, 1, env->xdf2.nrec);
14696
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
373 }