Mercurial > vim
annotate src/xdiff/xdiffi.c @ 19694:196dcd448100
Added tag v8.2.0403 for changeset 9fbeb3bdf49e51b60c5eb575d4399ecbff0100b8
author | Bram Moolenaar <Bram@vim.org> |
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date | Thu, 19 Mar 2020 12:45:05 +0100 |
parents | 3be01cf0a632 |
children | d5142d87f898 |
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 Davide Libenzi |
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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 |
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23 #include "xinclude.h" |
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24 |
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25 #define XDL_MAX_COST_MIN 256 |
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26 #define XDL_HEUR_MIN_COST 256 |
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27 #define XDL_LINE_MAX (long)((1UL << (CHAR_BIT * sizeof(long) - 1)) - 1) |
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28 #define XDL_SNAKE_CNT 20 |
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29 #define XDL_K_HEUR 4 |
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30 |
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31 typedef struct s_xdpsplit { |
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32 long i1, i2; |
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33 int min_lo, min_hi; |
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34 } xdpsplit_t; |
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35 |
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36 /* |
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37 * See "An O(ND) Difference Algorithm and its Variations", by Eugene Myers. |
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38 * Basically considers a "box" (off1, off2, lim1, lim2) and scan from both |
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39 * the forward diagonal starting from (off1, off2) and the backward diagonal |
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40 * starting from (lim1, lim2). If the K values on the same diagonal crosses |
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41 * returns the furthest point of reach. We might end up having to expensive |
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42 * cases using this algorithm is full, so a little bit of heuristic is needed |
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43 * to cut the search and to return a suboptimal point. |
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44 */ |
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45 static long xdl_split(unsigned long const *ha1, long off1, long lim1, |
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46 unsigned long const *ha2, long off2, long lim2, |
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47 long *kvdf, long *kvdb, int need_min, xdpsplit_t *spl, |
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48 xdalgoenv_t *xenv) { |
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49 long dmin = off1 - lim2, dmax = lim1 - off2; |
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50 long fmid = off1 - off2, bmid = lim1 - lim2; |
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51 long odd = (fmid - bmid) & 1; |
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52 long fmin = fmid, fmax = fmid; |
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53 long bmin = bmid, bmax = bmid; |
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54 long ec, d, i1, i2, prev1, best, dd, v, k; |
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55 |
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56 /* |
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57 * Set initial diagonal values for both forward and backward path. |
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58 */ |
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59 kvdf[fmid] = off1; |
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60 kvdb[bmid] = lim1; |
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61 |
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62 for (ec = 1;; ec++) { |
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63 int got_snake = 0; |
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64 |
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65 /* |
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66 * We need to extent the diagonal "domain" by one. If the next |
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67 * values exits the box boundaries we need to change it in the |
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68 * opposite direction because (max - min) must be a power of two. |
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69 * Also we initialize the external K value to -1 so that we can |
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70 * avoid extra conditions check inside the core loop. |
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71 */ |
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72 if (fmin > dmin) |
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73 kvdf[--fmin - 1] = -1; |
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74 else |
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75 ++fmin; |
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76 if (fmax < dmax) |
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77 kvdf[++fmax + 1] = -1; |
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78 else |
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79 --fmax; |
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80 |
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81 for (d = fmax; d >= fmin; d -= 2) { |
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82 if (kvdf[d - 1] >= kvdf[d + 1]) |
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83 i1 = kvdf[d - 1] + 1; |
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84 else |
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85 i1 = kvdf[d + 1]; |
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86 prev1 = i1; |
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87 i2 = i1 - d; |
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88 for (; i1 < lim1 && i2 < lim2 && ha1[i1] == ha2[i2]; i1++, i2++); |
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89 if (i1 - prev1 > xenv->snake_cnt) |
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90 got_snake = 1; |
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91 kvdf[d] = i1; |
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92 if (odd && bmin <= d && d <= bmax && kvdb[d] <= i1) { |
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93 spl->i1 = i1; |
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94 spl->i2 = i2; |
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95 spl->min_lo = spl->min_hi = 1; |
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96 return ec; |
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97 } |
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98 } |
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99 |
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100 /* |
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101 * We need to extent the diagonal "domain" by one. If the next |
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102 * values exits the box boundaries we need to change it in the |
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103 * opposite direction because (max - min) must be a power of two. |
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104 * Also we initialize the external K value to -1 so that we can |
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105 * avoid extra conditions check inside the core loop. |
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106 */ |
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107 if (bmin > dmin) |
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108 kvdb[--bmin - 1] = XDL_LINE_MAX; |
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109 else |
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110 ++bmin; |
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111 if (bmax < dmax) |
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112 kvdb[++bmax + 1] = XDL_LINE_MAX; |
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113 else |
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114 --bmax; |
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115 |
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116 for (d = bmax; d >= bmin; d -= 2) { |
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117 if (kvdb[d - 1] < kvdb[d + 1]) |
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118 i1 = kvdb[d - 1]; |
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119 else |
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120 i1 = kvdb[d + 1] - 1; |
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121 prev1 = i1; |
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122 i2 = i1 - d; |
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123 for (; i1 > off1 && i2 > off2 && ha1[i1 - 1] == ha2[i2 - 1]; i1--, i2--); |
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124 if (prev1 - i1 > xenv->snake_cnt) |
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125 got_snake = 1; |
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126 kvdb[d] = i1; |
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127 if (!odd && fmin <= d && d <= fmax && i1 <= kvdf[d]) { |
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128 spl->i1 = i1; |
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129 spl->i2 = i2; |
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130 spl->min_lo = spl->min_hi = 1; |
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131 return ec; |
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132 } |
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133 } |
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134 |
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135 if (need_min) |
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136 continue; |
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137 |
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138 /* |
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139 * If the edit cost is above the heuristic trigger and if |
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140 * we got a good snake, we sample current diagonals to see |
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141 * if some of the, have reached an "interesting" path. Our |
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142 * measure is a function of the distance from the diagonal |
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143 * corner (i1 + i2) penalized with the distance from the |
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144 * mid diagonal itself. If this value is above the current |
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145 * edit cost times a magic factor (XDL_K_HEUR) we consider |
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146 * it interesting. |
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147 */ |
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148 if (got_snake && ec > xenv->heur_min) { |
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149 for (best = 0, d = fmax; d >= fmin; d -= 2) { |
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150 dd = d > fmid ? d - fmid: fmid - d; |
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151 i1 = kvdf[d]; |
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152 i2 = i1 - d; |
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153 v = (i1 - off1) + (i2 - off2) - dd; |
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154 |
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155 if (v > XDL_K_HEUR * ec && v > best && |
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156 off1 + xenv->snake_cnt <= i1 && i1 < lim1 && |
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157 off2 + xenv->snake_cnt <= i2 && i2 < lim2) { |
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158 for (k = 1; ha1[i1 - k] == ha2[i2 - k]; k++) |
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159 if (k == xenv->snake_cnt) { |
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160 best = v; |
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161 spl->i1 = i1; |
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162 spl->i2 = i2; |
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163 break; |
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164 } |
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165 } |
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166 } |
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167 if (best > 0) { |
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168 spl->min_lo = 1; |
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169 spl->min_hi = 0; |
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170 return ec; |
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171 } |
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172 |
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173 for (best = 0, d = bmax; d >= bmin; d -= 2) { |
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174 dd = d > bmid ? d - bmid: bmid - d; |
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175 i1 = kvdb[d]; |
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176 i2 = i1 - d; |
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177 v = (lim1 - i1) + (lim2 - i2) - dd; |
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178 |
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179 if (v > XDL_K_HEUR * ec && v > best && |
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180 off1 < i1 && i1 <= lim1 - xenv->snake_cnt && |
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181 off2 < i2 && i2 <= lim2 - xenv->snake_cnt) { |
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182 for (k = 0; ha1[i1 + k] == ha2[i2 + k]; k++) |
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183 if (k == xenv->snake_cnt - 1) { |
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184 best = v; |
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185 spl->i1 = i1; |
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186 spl->i2 = i2; |
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187 break; |
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188 } |
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189 } |
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190 } |
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191 if (best > 0) { |
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192 spl->min_lo = 0; |
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193 spl->min_hi = 1; |
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194 return ec; |
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|
195 } |
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|
196 } |
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197 |
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198 /* |
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199 * Enough is enough. We spent too much time here and now we collect |
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200 * the furthest reaching path using the (i1 + i2) measure. |
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201 */ |
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202 if (ec >= xenv->mxcost) { |
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203 long fbest, fbest1, bbest, bbest1; |
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204 |
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205 fbest = fbest1 = -1; |
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206 for (d = fmax; d >= fmin; d -= 2) { |
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207 i1 = XDL_MIN(kvdf[d], lim1); |
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208 i2 = i1 - d; |
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209 if (lim2 < i2) |
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210 i1 = lim2 + d, i2 = lim2; |
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211 if (fbest < i1 + i2) { |
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212 fbest = i1 + i2; |
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213 fbest1 = i1; |
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214 } |
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215 } |
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216 |
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217 bbest = bbest1 = XDL_LINE_MAX; |
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218 for (d = bmax; d >= bmin; d -= 2) { |
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219 i1 = XDL_MAX(off1, kvdb[d]); |
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220 i2 = i1 - d; |
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221 if (i2 < off2) |
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222 i1 = off2 + d, i2 = off2; |
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223 if (i1 + i2 < bbest) { |
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224 bbest = i1 + i2; |
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225 bbest1 = i1; |
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226 } |
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227 } |
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228 |
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229 if ((lim1 + lim2) - bbest < fbest - (off1 + off2)) { |
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230 spl->i1 = fbest1; |
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231 spl->i2 = fbest - fbest1; |
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232 spl->min_lo = 1; |
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233 spl->min_hi = 0; |
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234 } else { |
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235 spl->i1 = bbest1; |
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236 spl->i2 = bbest - bbest1; |
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237 spl->min_lo = 0; |
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238 spl->min_hi = 1; |
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239 } |
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240 return ec; |
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241 } |
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242 } |
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243 } |
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244 |
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245 |
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246 /* |
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247 * Rule: "Divide et Impera". Recursively split the box in sub-boxes by calling |
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248 * the box splitting function. Note that the real job (marking changed lines) |
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249 * is done in the two boundary reaching checks. |
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250 */ |
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251 int xdl_recs_cmp(diffdata_t *dd1, long off1, long lim1, |
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252 diffdata_t *dd2, long off2, long lim2, |
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253 long *kvdf, long *kvdb, int need_min, xdalgoenv_t *xenv) { |
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254 unsigned long const *ha1 = dd1->ha, *ha2 = dd2->ha; |
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255 |
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256 /* |
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257 * Shrink the box by walking through each diagonal snake (SW and NE). |
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258 */ |
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259 for (; off1 < lim1 && off2 < lim2 && ha1[off1] == ha2[off2]; off1++, off2++); |
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260 for (; off1 < lim1 && off2 < lim2 && ha1[lim1 - 1] == ha2[lim2 - 1]; lim1--, lim2--); |
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261 |
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262 /* |
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263 * If one dimension is empty, then all records on the other one must |
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264 * be obviously changed. |
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265 */ |
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266 if (off1 == lim1) { |
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267 char *rchg2 = dd2->rchg; |
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268 long *rindex2 = dd2->rindex; |
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269 |
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270 for (; off2 < lim2; off2++) |
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271 rchg2[rindex2[off2]] = 1; |
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272 } else if (off2 == lim2) { |
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273 char *rchg1 = dd1->rchg; |
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274 long *rindex1 = dd1->rindex; |
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275 |
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276 for (; off1 < lim1; off1++) |
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277 rchg1[rindex1[off1]] = 1; |
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278 } else { |
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279 xdpsplit_t spl; |
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280 spl.i1 = spl.i2 = 0; |
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281 |
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282 /* |
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283 * Divide ... |
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284 */ |
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285 if (xdl_split(ha1, off1, lim1, ha2, off2, lim2, kvdf, kvdb, |
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286 need_min, &spl, xenv) < 0) { |
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287 |
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288 return -1; |
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289 } |
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290 |
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291 /* |
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292 * ... et Impera. |
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293 */ |
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294 if (xdl_recs_cmp(dd1, off1, spl.i1, dd2, off2, spl.i2, |
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295 kvdf, kvdb, spl.min_lo, xenv) < 0 || |
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296 xdl_recs_cmp(dd1, spl.i1, lim1, dd2, spl.i2, lim2, |
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297 kvdf, kvdb, spl.min_hi, xenv) < 0) { |
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298 |
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299 return -1; |
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300 } |
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301 } |
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302 |
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303 return 0; |
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304 } |
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305 |
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306 |
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307 int xdl_do_diff(mmfile_t *mf1, mmfile_t *mf2, xpparam_t const *xpp, |
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308 xdfenv_t *xe) { |
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309 long ndiags; |
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310 long *kvd, *kvdf, *kvdb; |
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311 xdalgoenv_t xenv; |
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312 diffdata_t dd1, dd2; |
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313 |
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314 if (XDF_DIFF_ALG(xpp->flags) == XDF_PATIENCE_DIFF) |
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315 return xdl_do_patience_diff(mf1, mf2, xpp, xe); |
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316 |
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317 if (XDF_DIFF_ALG(xpp->flags) == XDF_HISTOGRAM_DIFF) |
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318 return xdl_do_histogram_diff(mf1, mf2, xpp, xe); |
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319 |
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320 if (xdl_prepare_env(mf1, mf2, xpp, xe) < 0) { |
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321 |
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322 return -1; |
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323 } |
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324 |
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325 /* |
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326 * Allocate and setup K vectors to be used by the differential algorithm. |
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327 * One is to store the forward path and one to store the backward path. |
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328 */ |
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329 ndiags = xe->xdf1.nreff + xe->xdf2.nreff + 3; |
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330 if (!(kvd = (long *) xdl_malloc((2 * ndiags + 2) * sizeof(long)))) { |
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331 |
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332 xdl_free_env(xe); |
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333 return -1; |
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334 } |
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335 kvdf = kvd; |
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336 kvdb = kvdf + ndiags; |
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337 kvdf += xe->xdf2.nreff + 1; |
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338 kvdb += xe->xdf2.nreff + 1; |
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339 |
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340 xenv.mxcost = xdl_bogosqrt(ndiags); |
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341 if (xenv.mxcost < XDL_MAX_COST_MIN) |
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342 xenv.mxcost = XDL_MAX_COST_MIN; |
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343 xenv.snake_cnt = XDL_SNAKE_CNT; |
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344 xenv.heur_min = XDL_HEUR_MIN_COST; |
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345 |
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346 dd1.nrec = xe->xdf1.nreff; |
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347 dd1.ha = xe->xdf1.ha; |
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348 dd1.rchg = xe->xdf1.rchg; |
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349 dd1.rindex = xe->xdf1.rindex; |
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350 dd2.nrec = xe->xdf2.nreff; |
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351 dd2.ha = xe->xdf2.ha; |
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352 dd2.rchg = xe->xdf2.rchg; |
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353 dd2.rindex = xe->xdf2.rindex; |
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354 |
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355 if (xdl_recs_cmp(&dd1, 0, dd1.nrec, &dd2, 0, dd2.nrec, |
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356 kvdf, kvdb, (xpp->flags & XDF_NEED_MINIMAL) != 0, &xenv) < 0) { |
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357 |
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358 xdl_free(kvd); |
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359 xdl_free_env(xe); |
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360 return -1; |
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361 } |
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362 |
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363 xdl_free(kvd); |
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364 |
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365 return 0; |
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366 } |
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367 |
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368 |
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369 static xdchange_t *xdl_add_change(xdchange_t *xscr, long i1, long i2, long chg1, long chg2) { |
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370 xdchange_t *xch; |
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371 |
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372 if (!(xch = (xdchange_t *) xdl_malloc(sizeof(xdchange_t)))) |
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373 return NULL; |
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374 |
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375 xch->next = xscr; |
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376 xch->i1 = i1; |
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377 xch->i2 = i2; |
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378 xch->chg1 = chg1; |
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379 xch->chg2 = chg2; |
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380 xch->ignore = 0; |
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381 |
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382 return xch; |
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383 } |
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384 |
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385 |
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386 static int recs_match(xrecord_t *rec1, xrecord_t *rec2, long flags) |
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387 { |
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388 return (rec1->ha == rec2->ha && |
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389 xdl_recmatch(rec1->ptr, rec1->size, |
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390 rec2->ptr, rec2->size, |
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391 flags)); |
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392 } |
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393 |
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394 /* |
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395 * If a line is indented more than this, xget_indent() just returns this value. |
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396 * This avoids having to do absurd amounts of work for data that are not |
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397 * human-readable text, and also ensures that the output of xget_indent fits within |
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398 * an int. |
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399 */ |
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400 #define MAX_INDENT 200 |
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401 |
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402 /* |
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403 * Return the amount of indentation of the specified line, treating TAB as 8 |
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404 * columns. Return -1 if line is empty or contains only whitespace. Clamp the |
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405 * output value at MAX_INDENT. |
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406 */ |
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407 static int xget_indent(xrecord_t *rec) |
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408 { |
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409 long i; |
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410 int ret = 0; |
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411 |
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412 for (i = 0; i < rec->size; i++) { |
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413 char c = rec->ptr[i]; |
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414 |
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415 if (!XDL_ISSPACE(c)) |
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416 return ret; |
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417 else if (c == ' ') |
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418 ret += 1; |
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419 else if (c == '\t') |
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420 ret += 8 - ret % 8; |
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421 // ignore other whitespace characters |
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422 |
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423 if (ret >= MAX_INDENT) |
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424 return MAX_INDENT; |
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425 } |
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426 |
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427 // The line contains only whitespace. |
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428 return -1; |
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429 } |
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430 |
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431 /* |
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432 * If more than this number of consecutive blank rows are found, just return |
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433 * this value. This avoids requiring O(N^2) work for pathological cases, and |
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434 * also ensures that the output of score_split fits in an int. |
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435 */ |
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436 #define MAX_BLANKS 20 |
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437 |
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438 // Characteristics measured about a hypothetical split position. |
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439 struct split_measurement { |
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440 /* |
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441 * Is the split at the end of the file (aside from any blank lines)? |
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442 */ |
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443 int end_of_file; |
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444 |
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445 /* |
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446 * How much is the line immediately following the split indented (or -1 if |
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447 * the line is blank): |
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448 */ |
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449 int indent; |
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|
450 |
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451 /* |
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452 * How many consecutive lines above the split are blank? |
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453 */ |
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454 int pre_blank; |
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455 |
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456 /* |
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457 * How much is the nearest non-blank line above the split indented (or -1 |
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458 * if there is no such line)? |
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459 */ |
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460 int pre_indent; |
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461 |
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462 /* |
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463 * How many lines after the line following the split are blank? |
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464 */ |
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465 int post_blank; |
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466 |
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467 /* |
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468 * How much is the nearest non-blank line after the line following the |
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469 * split indented (or -1 if there is no such line)? |
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470 */ |
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471 int post_indent; |
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472 }; |
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473 |
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474 struct split_score { |
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475 // The effective indent of this split (smaller is preferred). |
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476 int effective_indent; |
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477 |
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478 // Penalty for this split (smaller is preferred). |
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479 int penalty; |
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480 }; |
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481 |
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482 /* |
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483 * Fill m with information about a hypothetical split of xdf above line split. |
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484 */ |
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485 static void measure_split(const xdfile_t *xdf, long split, |
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486 struct split_measurement *m) |
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487 { |
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488 long i; |
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489 |
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490 if (split >= xdf->nrec) { |
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491 m->end_of_file = 1; |
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492 m->indent = -1; |
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493 } else { |
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494 m->end_of_file = 0; |
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495 m->indent = xget_indent(xdf->recs[split]); |
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496 } |
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497 |
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498 m->pre_blank = 0; |
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499 m->pre_indent = -1; |
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500 for (i = split - 1; i >= 0; i--) { |
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501 m->pre_indent = xget_indent(xdf->recs[i]); |
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502 if (m->pre_indent != -1) |
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503 break; |
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504 m->pre_blank += 1; |
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505 if (m->pre_blank == MAX_BLANKS) { |
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506 m->pre_indent = 0; |
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507 break; |
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508 } |
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509 } |
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510 |
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511 m->post_blank = 0; |
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512 m->post_indent = -1; |
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513 for (i = split + 1; i < xdf->nrec; i++) { |
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514 m->post_indent = xget_indent(xdf->recs[i]); |
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515 if (m->post_indent != -1) |
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516 break; |
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517 m->post_blank += 1; |
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518 if (m->post_blank == MAX_BLANKS) { |
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519 m->post_indent = 0; |
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520 break; |
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521 } |
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522 } |
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523 } |
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524 |
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525 /* |
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526 * The empirically-determined weight factors used by score_split() below. |
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527 * Larger values means that the position is a less favorable place to split. |
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528 * |
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529 * Note that scores are only ever compared against each other, so multiplying |
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530 * all of these weight/penalty values by the same factor wouldn't change the |
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531 * heuristic's behavior. Still, we need to set that arbitrary scale *somehow*. |
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532 * In practice, these numbers are chosen to be large enough that they can be |
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533 * adjusted relative to each other with sufficient precision despite using |
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534 * integer math. |
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535 */ |
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536 |
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537 // Penalty if there are no non-blank lines before the split |
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538 #define START_OF_FILE_PENALTY 1 |
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539 |
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540 // Penalty if there are no non-blank lines after the split |
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541 #define END_OF_FILE_PENALTY 21 |
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542 |
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543 // Multiplier for the number of blank lines around the split |
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544 #define TOTAL_BLANK_WEIGHT (-30) |
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545 |
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546 // Multiplier for the number of blank lines after the split |
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547 #define POST_BLANK_WEIGHT 6 |
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548 |
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549 /* |
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550 * Penalties applied if the line is indented more than its predecessor |
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551 */ |
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552 #define RELATIVE_INDENT_PENALTY (-4) |
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553 #define RELATIVE_INDENT_WITH_BLANK_PENALTY 10 |
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554 |
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555 /* |
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556 * Penalties applied if the line is indented less than both its predecessor and |
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557 * its successor |
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558 */ |
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559 #define RELATIVE_OUTDENT_PENALTY 24 |
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560 #define RELATIVE_OUTDENT_WITH_BLANK_PENALTY 17 |
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561 |
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562 /* |
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563 * Penalties applied if the line is indented less than its predecessor but not |
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564 * less than its successor |
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565 */ |
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|
566 #define RELATIVE_DEDENT_PENALTY 23 |
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567 #define RELATIVE_DEDENT_WITH_BLANK_PENALTY 17 |
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568 |
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569 /* |
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570 * We only consider whether the sum of the effective indents for splits are |
195e8b1fcbbf
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571 * less than (-1), equal to (0), or greater than (+1) each other. The resulting |
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Christian Brabandt <cb@256bit.org>
parents:
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|
572 * value is multiplied by the following weight and combined with the penalty to |
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Christian Brabandt <cb@256bit.org>
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573 * determine the better of two scores. |
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574 */ |
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575 #define INDENT_WEIGHT 60 |
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576 |
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|
577 /* |
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578 * How far do we slide a hunk at most? |
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579 */ |
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580 #define INDENT_HEURISTIC_MAX_SLIDING 100 |
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581 |
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582 /* |
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583 * Compute a badness score for the hypothetical split whose measurements are |
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584 * stored in m. The weight factors were determined empirically using the tools and |
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585 * corpus described in |
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|
586 * |
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587 * https://github.com/mhagger/diff-slider-tools |
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|
588 * |
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589 * Also see that project if you want to improve the weights based on, for example, |
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590 * a larger or more diverse corpus. |
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591 */ |
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|
592 static void score_add_split(const struct split_measurement *m, struct split_score *s) |
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593 { |
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594 /* |
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595 * A place to accumulate penalty factors (positive makes this index more |
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596 * favored): |
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597 */ |
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|
598 int post_blank, total_blank, indent, any_blanks; |
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|
599 |
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600 if (m->pre_indent == -1 && m->pre_blank == 0) |
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601 s->penalty += START_OF_FILE_PENALTY; |
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|
602 |
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|
603 if (m->end_of_file) |
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604 s->penalty += END_OF_FILE_PENALTY; |
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605 |
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|
606 /* |
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|
607 * Set post_blank to the number of blank lines following the split, |
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608 * including the line immediately after the split: |
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609 */ |
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610 post_blank = (m->indent == -1) ? 1 + m->post_blank : 0; |
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611 total_blank = m->pre_blank + post_blank; |
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612 |
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613 // Penalties based on nearby blank lines: |
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614 s->penalty += TOTAL_BLANK_WEIGHT * total_blank; |
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615 s->penalty += POST_BLANK_WEIGHT * post_blank; |
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616 |
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617 if (m->indent != -1) |
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618 indent = m->indent; |
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619 else |
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620 indent = m->post_indent; |
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|
621 |
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622 any_blanks = (total_blank != 0); |
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623 |
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624 // Note that the effective indent is -1 at the end of the file: |
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625 s->effective_indent += indent; |
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626 |
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627 if (indent == -1) { |
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628 // No additional adjustments needed. |
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629 } else if (m->pre_indent == -1) { |
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630 // No additional adjustments needed. |
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631 } else if (indent > m->pre_indent) { |
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632 /* |
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633 * The line is indented more than its predecessor. |
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634 */ |
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635 s->penalty += any_blanks ? |
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636 RELATIVE_INDENT_WITH_BLANK_PENALTY : |
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637 RELATIVE_INDENT_PENALTY; |
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638 } else if (indent == m->pre_indent) { |
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639 /* |
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|
640 * The line has the same indentation level as its predecessor. |
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641 * No additional adjustments needed. |
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|
642 */ |
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643 } else { |
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|
644 /* |
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|
645 * The line is indented less than its predecessor. It could be |
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646 * the block terminator of the previous block, but it could |
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647 * also be the start of a new block (e.g., an "else" block, or |
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648 * maybe the previous block didn't have a block terminator). |
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649 * Try to distinguish those cases based on what comes next: |
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650 */ |
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651 if (m->post_indent != -1 && m->post_indent > indent) { |
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|
652 /* |
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|
653 * The following line is indented more. So it is likely |
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654 * that this line is the start of a block. |
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|
655 */ |
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|
656 s->penalty += any_blanks ? |
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657 RELATIVE_OUTDENT_WITH_BLANK_PENALTY : |
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658 RELATIVE_OUTDENT_PENALTY; |
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659 } else { |
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|
660 /* |
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|
661 * That was probably the end of a block. |
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|
662 */ |
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|
663 s->penalty += any_blanks ? |
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|
664 RELATIVE_DEDENT_WITH_BLANK_PENALTY : |
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|
665 RELATIVE_DEDENT_PENALTY; |
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|
666 } |
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|
667 } |
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|
668 } |
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|
669 |
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670 static int score_cmp(struct split_score *s1, struct split_score *s2) |
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671 { |
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672 // -1 if s1.effective_indent < s2->effective_indent, etc. |
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673 int cmp_indents = ((s1->effective_indent > s2->effective_indent) - |
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|
674 (s1->effective_indent < s2->effective_indent)); |
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|
675 |
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|
676 return INDENT_WEIGHT * cmp_indents + (s1->penalty - s2->penalty); |
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|
677 } |
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|
678 |
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|
679 /* |
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|
680 * Represent a group of changed lines in an xdfile_t (i.e., a contiguous group |
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681 * of lines that was inserted or deleted from the corresponding version of the |
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682 * file). We consider there to be such a group at the beginning of the file, at |
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|
683 * the end of the file, and between any two unchanged lines, though most such |
195e8b1fcbbf
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|
684 * groups will usually be empty. |
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|
685 * |
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Christian Brabandt <cb@256bit.org>
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|
686 * If the first line in a group is equal to the line following the group, then |
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patch 8.1.0360: using an external diff program is slow and inflexible
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687 * the group can be slid down. Similarly, if the last line in a group is equal |
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688 * to the line preceding the group, then the group can be slid up. See |
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|
689 * group_slide_down() and group_slide_up(). |
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Christian Brabandt <cb@256bit.org>
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|
690 * |
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Christian Brabandt <cb@256bit.org>
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|
691 * Note that loops that are testing for changed lines in xdf->rchg do not need |
195e8b1fcbbf
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Christian Brabandt <cb@256bit.org>
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|
692 * index bounding since the array is prepared with a zero at position -1 and N. |
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|
693 */ |
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|
694 struct xdlgroup { |
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changeset
|
695 /* |
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|
696 * The index of the first changed line in the group, or the index of |
195e8b1fcbbf
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Christian Brabandt <cb@256bit.org>
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|
697 * the unchanged line above which the (empty) group is located. |
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|
698 */ |
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|
699 long start; |
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|
700 |
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Christian Brabandt <cb@256bit.org>
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|
701 /* |
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changeset
|
702 * The index of the first unchanged line after the group. For an empty |
195e8b1fcbbf
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Christian Brabandt <cb@256bit.org>
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|
703 * group, end is equal to start. |
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704 */ |
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patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
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|
705 long end; |
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|
706 }; |
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|
707 |
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patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
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|
708 /* |
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patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
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|
709 * Initialize g to point at the first group in xdf. |
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patch 8.1.0360: using an external diff program is slow and inflexible
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parents:
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|
710 */ |
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Christian Brabandt <cb@256bit.org>
parents:
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changeset
|
711 static void group_init(xdfile_t *xdf, struct xdlgroup *g) |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
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|
712 { |
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patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
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|
713 g->start = g->end = 0; |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
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|
714 while (xdf->rchg[g->end]) |
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Christian Brabandt <cb@256bit.org>
parents:
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|
715 g->end++; |
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Christian Brabandt <cb@256bit.org>
parents:
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|
716 } |
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patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
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changeset
|
717 |
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patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
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|
718 /* |
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patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
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|
719 * Move g to describe the next (possibly empty) group in xdf and return 0. If g |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
720 * is already at the end of the file, do nothing and return -1. |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
721 */ |
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patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
722 static inline int group_next(xdfile_t *xdf, struct xdlgroup *g) |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
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changeset
|
723 { |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
724 if (g->end == xdf->nrec) |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
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changeset
|
725 return -1; |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
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changeset
|
726 |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
727 g->start = g->end + 1; |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
728 for (g->end = g->start; xdf->rchg[g->end]; g->end++) |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
729 ; |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
730 |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
731 return 0; |
195e8b1fcbbf
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Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
732 } |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
733 |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
734 /* |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
735 * Move g to describe the previous (possibly empty) group in xdf and return 0. |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
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changeset
|
736 * If g is already at the beginning of the file, do nothing and return -1. |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
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|
737 */ |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
738 static inline int group_previous(xdfile_t *xdf, struct xdlgroup *g) |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
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changeset
|
739 { |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
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changeset
|
740 if (g->start == 0) |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
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changeset
|
741 return -1; |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
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changeset
|
742 |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
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changeset
|
743 g->end = g->start - 1; |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
744 for (g->start = g->end; xdf->rchg[g->start - 1]; g->start--) |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
745 ; |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
746 |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
747 return 0; |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
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changeset
|
748 } |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
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changeset
|
749 |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
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changeset
|
750 /* |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
751 * If g can be slid toward the end of the file, do so, and if it bumps into a |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
752 * following group, expand this group to include it. Return 0 on success or -1 |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
753 * if g cannot be slid down. |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
754 */ |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
755 static int group_slide_down(xdfile_t *xdf, struct xdlgroup *g, long flags) |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
756 { |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
757 if (g->end < xdf->nrec && |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
758 recs_match(xdf->recs[g->start], xdf->recs[g->end], flags)) { |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
759 xdf->rchg[g->start++] = 0; |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
760 xdf->rchg[g->end++] = 1; |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
761 |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
762 while (xdf->rchg[g->end]) |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
763 g->end++; |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
764 |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
765 return 0; |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
766 } else { |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
767 return -1; |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
768 } |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
769 } |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
770 |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
771 /* |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
772 * If g can be slid toward the beginning of the file, do so, and if it bumps |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
773 * into a previous group, expand this group to include it. Return 0 on success |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
774 * or -1 if g cannot be slid up. |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
775 */ |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
776 static int group_slide_up(xdfile_t *xdf, struct xdlgroup *g, long flags) |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
777 { |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
778 if (g->start > 0 && |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
779 recs_match(xdf->recs[g->start - 1], xdf->recs[g->end - 1], flags)) { |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
780 xdf->rchg[--g->start] = 1; |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
781 xdf->rchg[--g->end] = 0; |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
782 |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
783 while (xdf->rchg[g->start - 1]) |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
784 g->start--; |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
785 |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
786 return 0; |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
787 } else { |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
788 return -1; |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
789 } |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
790 } |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
791 |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
792 static void xdl_bug(const char *msg) |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
793 { |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
794 fprintf(stderr, "BUG: %s\n", msg); |
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795 exit(1); |
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|
796 } |
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|
797 |
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|
798 /* |
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|
799 * Move back and forward change groups for a consistent and pretty diff output. |
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|
800 * This also helps in finding joinable change groups and reducing the diff |
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|
801 * size. |
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|
802 */ |
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|
803 int xdl_change_compact(xdfile_t *xdf, xdfile_t *xdfo, long flags) { |
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804 struct xdlgroup g, go; |
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805 long earliest_end, end_matching_other; |
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806 long groupsize; |
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|
807 |
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|
808 group_init(xdf, &g); |
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809 group_init(xdfo, &go); |
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|
810 |
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|
811 while (1) { |
18802
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|
812 // If the group is empty in the to-be-compacted file, skip it: |
14696
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|
813 if (g.end == g.start) |
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|
814 goto next; |
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|
815 |
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|
816 /* |
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|
817 * Now shift the change up and then down as far as possible in |
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818 * each direction. If it bumps into any other changes, merge them. |
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|
819 */ |
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820 do { |
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821 groupsize = g.end - g.start; |
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822 |
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|
823 /* |
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824 * Keep track of the last "end" index that causes this |
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825 * group to align with a group of changed lines in the |
195e8b1fcbbf
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826 * other file. -1 indicates that we haven't found such |
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827 * a match yet: |
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828 */ |
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829 end_matching_other = -1; |
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|
830 |
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831 // Shift the group backward as much as possible: |
14696
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832 while (!group_slide_up(xdf, &g, flags)) |
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|
833 if (group_previous(xdfo, &go)) |
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834 xdl_bug("group sync broken sliding up"); |
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835 |
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|
836 /* |
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837 * This is this highest that this group can be shifted. |
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838 * Record its end index: |
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839 */ |
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|
840 earliest_end = g.end; |
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|
841 |
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|
842 if (go.end > go.start) |
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843 end_matching_other = g.end; |
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844 |
18802
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845 // Now shift the group forward as far as possible: |
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846 while (1) { |
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847 if (group_slide_down(xdf, &g, flags)) |
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848 break; |
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849 if (group_next(xdfo, &go)) |
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850 xdl_bug("group sync broken sliding down"); |
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|
851 |
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|
852 if (go.end > go.start) |
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853 end_matching_other = g.end; |
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|
854 } |
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855 } while (groupsize != g.end - g.start); |
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|
856 |
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|
857 /* |
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changeset
|
858 * If the group can be shifted, then we can possibly use this |
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Christian Brabandt <cb@256bit.org>
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|
859 * freedom to produce a more intuitive diff. |
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860 * |
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861 * The group is currently shifted as far down as possible, so the |
195e8b1fcbbf
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862 * heuristics below only have to handle upwards shifts. |
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|
863 */ |
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|
864 |
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changeset
|
865 if (g.end == earliest_end) { |
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|
866 // no shifting was possible |
14696
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|
867 } else if (end_matching_other != -1) { |
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|
868 /* |
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|
869 * Move the possibly merged group of changes back to line |
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changeset
|
870 * up with the last group of changes from the other file |
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871 * that it can align with. |
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|
872 */ |
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|
873 while (go.end == go.start) { |
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|
874 if (group_slide_up(xdf, &g, flags)) |
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|
875 xdl_bug("match disappeared"); |
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|
876 if (group_previous(xdfo, &go)) |
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|
877 xdl_bug("group sync broken sliding to match"); |
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|
878 } |
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|
879 } else if (flags & XDF_INDENT_HEURISTIC) { |
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|
880 /* |
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Christian Brabandt <cb@256bit.org>
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|
881 * Indent heuristic: a group of pure add/delete lines |
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|
882 * implies two splits, one between the end of the "before" |
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Christian Brabandt <cb@256bit.org>
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|
883 * context and the start of the group, and another between |
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|
884 * the end of the group and the beginning of the "after" |
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|
885 * context. Some splits are aesthetically better and some |
195e8b1fcbbf
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|
886 * are worse. We compute a badness "score" for each split, |
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|
887 * and add the scores for the two splits to define a |
195e8b1fcbbf
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Christian Brabandt <cb@256bit.org>
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|
888 * "score" for each position that the group can be shifted |
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|
889 * to. Then we pick the shift with the lowest score. |
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|
890 */ |
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|
891 long shift, best_shift = -1; |
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|
892 struct split_score best_score; |
195e8b1fcbbf
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|
893 |
195e8b1fcbbf
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|
894 shift = earliest_end; |
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|
895 if (g.end - groupsize - 1 > shift) |
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|
896 shift = g.end - groupsize - 1; |
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|
897 if (g.end - INDENT_HEURISTIC_MAX_SLIDING > shift) |
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|
898 shift = g.end - INDENT_HEURISTIC_MAX_SLIDING; |
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|
899 for (; shift <= g.end; shift++) { |
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|
900 struct split_measurement m; |
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|
901 struct split_score score = {0, 0}; |
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|
902 |
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|
903 measure_split(xdf, shift, &m); |
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Christian Brabandt <cb@256bit.org>
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|
904 score_add_split(&m, &score); |
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|
905 measure_split(xdf, shift - groupsize, &m); |
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|
906 score_add_split(&m, &score); |
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Christian Brabandt <cb@256bit.org>
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|
907 if (best_shift == -1 || |
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changeset
|
908 score_cmp(&score, &best_score) <= 0) { |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
909 best_score.effective_indent = score.effective_indent; |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
910 best_score.penalty = score.penalty; |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
911 best_shift = shift; |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
912 } |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
913 } |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
914 |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
915 while (g.end > best_shift) { |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
916 if (group_slide_up(xdf, &g, flags)) |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
917 xdl_bug("best shift unreached"); |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
918 if (group_previous(xdfo, &go)) |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
919 xdl_bug("group sync broken sliding to blank line"); |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
920 } |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
921 } |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
922 |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
923 next: |
18802
3be01cf0a632
patch 8.1.2389: using old C style comments
Bram Moolenaar <Bram@vim.org>
parents:
14730
diff
changeset
|
924 // Move past the just-processed group: |
14696
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
925 if (group_next(xdf, &g)) |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
926 break; |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
927 if (group_next(xdfo, &go)) |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
928 xdl_bug("group sync broken moving to next group"); |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
929 } |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
930 |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
931 if (!group_next(xdfo, &go)) |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
932 xdl_bug("group sync broken at end of file"); |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
933 |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
934 return 0; |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
935 } |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
936 |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
937 |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
938 int xdl_build_script(xdfenv_t *xe, xdchange_t **xscr) { |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
939 xdchange_t *cscr = NULL, *xch; |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
940 char *rchg1 = xe->xdf1.rchg, *rchg2 = xe->xdf2.rchg; |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
941 long i1, i2, l1, l2; |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
942 |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
943 /* |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
944 * Trivial. Collects "groups" of changes and creates an edit script. |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
945 */ |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
946 for (i1 = xe->xdf1.nrec, i2 = xe->xdf2.nrec; i1 >= 0 || i2 >= 0; i1--, i2--) |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
947 if (rchg1[i1 - 1] || rchg2[i2 - 1]) { |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
948 for (l1 = i1; rchg1[i1 - 1]; i1--); |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
949 for (l2 = i2; rchg2[i2 - 1]; i2--); |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
950 |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
951 if (!(xch = xdl_add_change(cscr, i1, i2, l1 - i1, l2 - i2))) { |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
952 xdl_free_script(cscr); |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
953 return -1; |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
954 } |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
955 cscr = xch; |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
956 } |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
957 |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
958 *xscr = cscr; |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
959 |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
960 return 0; |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
961 } |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
962 |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
963 |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
964 void xdl_free_script(xdchange_t *xscr) { |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
965 xdchange_t *xch; |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
966 |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
967 while ((xch = xscr) != NULL) { |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
968 xscr = xscr->next; |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
969 xdl_free(xch); |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
970 } |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
971 } |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
972 |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
973 static int xdl_call_hunk_func(xdfenv_t *xe UNUSED, xdchange_t *xscr, xdemitcb_t *ecb, |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
974 xdemitconf_t const *xecfg) |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
975 { |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
976 xdchange_t *xch, *xche; |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
977 |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
978 for (xch = xscr; xch; xch = xche->next) { |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
979 xche = xdl_get_hunk(&xch, xecfg); |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
980 if (!xch) |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
981 break; |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
982 if (xecfg->hunk_func(xch->i1, xche->i1 + xche->chg1 - xch->i1, |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
983 xch->i2, xche->i2 + xche->chg2 - xch->i2, |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
984 ecb->priv) < 0) |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
985 return -1; |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
986 } |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
987 return 0; |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
988 } |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
989 |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
990 static void xdl_mark_ignorable(xdchange_t *xscr, xdfenv_t *xe, long flags) |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
991 { |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
992 xdchange_t *xch; |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
993 |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
994 for (xch = xscr; xch; xch = xch->next) { |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
995 int ignore = 1; |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
996 xrecord_t **rec; |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
997 long i; |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
998 |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
999 rec = &xe->xdf1.recs[xch->i1]; |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
1000 for (i = 0; i < xch->chg1 && ignore; i++) |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
1001 ignore = xdl_blankline(rec[i]->ptr, rec[i]->size, flags); |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
1002 |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
1003 rec = &xe->xdf2.recs[xch->i2]; |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
1004 for (i = 0; i < xch->chg2 && ignore; i++) |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
1005 ignore = xdl_blankline(rec[i]->ptr, rec[i]->size, flags); |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
1006 |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
1007 xch->ignore = ignore; |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
1008 } |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
1009 } |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
1010 |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
1011 int xdl_diff(mmfile_t *mf1, mmfile_t *mf2, xpparam_t const *xpp, |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
1012 xdemitconf_t const *xecfg, xdemitcb_t *ecb) { |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
1013 xdchange_t *xscr; |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
1014 xdfenv_t xe; |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
1015 emit_func_t ef = xecfg->hunk_func ? xdl_call_hunk_func : xdl_emit_diff; |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
1016 |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
1017 if (xdl_do_diff(mf1, mf2, xpp, &xe) < 0) { |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
1018 |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
|
1019 return -1; |
195e8b1fcbbf
patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff
changeset
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1020 } |
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1021 if (xdl_change_compact(&xe.xdf1, &xe.xdf2, xpp->flags) < 0 || |
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1022 xdl_change_compact(&xe.xdf2, &xe.xdf1, xpp->flags) < 0 || |
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1023 xdl_build_script(&xe, &xscr) < 0) { |
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1024 |
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1025 xdl_free_env(&xe); |
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1026 return -1; |
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1027 } |
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1028 if (xscr) { |
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1029 if (xpp->flags & XDF_IGNORE_BLANK_LINES) |
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1030 xdl_mark_ignorable(xscr, &xe, xpp->flags); |
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1031 |
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1032 if (ef(&xe, xscr, ecb, xecfg) < 0) { |
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1033 |
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1034 xdl_free_script(xscr); |
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1035 xdl_free_env(&xe); |
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1036 return -1; |
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1037 } |
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1038 xdl_free_script(xscr); |
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1039 } |
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1040 xdl_free_env(&xe); |
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1041 |
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1042 return 0; |
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1043 } |