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annotate src/xdiff/xemit.c @ 16985:914898e347fe

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Added tag v8.1.1492 for changeset d4ecdb8a4c58ae162f0f8d7b2fb0fcc97dadab32
author Bram Moolenaar <Bram@vim.org>
date Sat, 08 Jun 2019 12:15:09 +0200
parents 9c94cfe5dd31
children 3be01cf0a632
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /*
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2 * LibXDiff by Davide Libenzi ( File Differential Library )
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3 * Copyright (C) 2003 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 static long xdl_get_rec(xdfile_t *xdf, long ri, char const **rec) {
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26
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27 *rec = xdf->recs[ri]->ptr;
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28
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29 return xdf->recs[ri]->size;
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30 }
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31
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32
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33 static int xdl_emit_record(xdfile_t *xdf, long ri, char const *pre, xdemitcb_t *ecb) {
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34 long size, psize = (long)strlen(pre);
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35 char const *rec;
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36
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37 size = xdl_get_rec(xdf, ri, &rec);
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38 if (xdl_emit_diffrec(rec, size, pre, psize, ecb) < 0) {
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39
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40 return -1;
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41 }
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42
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43 return 0;
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44 }
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45
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46
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47 /*
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48 * Starting at the passed change atom, find the latest change atom to be included
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49 * inside the differential hunk according to the specified configuration.
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50 * Also advance xscr if the first changes must be discarded.
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51 */
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52 xdchange_t *xdl_get_hunk(xdchange_t **xscr, xdemitconf_t const *xecfg)
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53 {
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54 xdchange_t *xch, *xchp, *lxch;
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55 long max_common = 2 * xecfg->ctxlen + xecfg->interhunkctxlen;
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56 long max_ignorable = xecfg->ctxlen;
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57 unsigned long ignored = 0; /* number of ignored blank lines */
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58
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59 /* remove ignorable changes that are too far before other changes */
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60 for (xchp = *xscr; xchp && xchp->ignore; xchp = xchp->next) {
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61 xch = xchp->next;
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62
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63 if (xch == NULL ||
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64 xch->i1 - (xchp->i1 + xchp->chg1) >= max_ignorable)
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65 *xscr = xch;
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66 }
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67
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68 if (*xscr == NULL)
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69 return NULL;
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70
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71 lxch = *xscr;
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72
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73 for (xchp = *xscr, xch = xchp->next; xch; xchp = xch, xch = xch->next) {
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74 long distance = xch->i1 - (xchp->i1 + xchp->chg1);
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75 if (distance > max_common)
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76 break;
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77
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78 if (distance < max_ignorable && (!xch->ignore || lxch == xchp)) {
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79 lxch = xch;
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80 ignored = 0;
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81 } else if (distance < max_ignorable && xch->ignore) {
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82 ignored += xch->chg2;
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83 } else if (lxch != xchp &&
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84 xch->i1 + (long)ignored - (lxch->i1 + lxch->chg1) > max_common) {
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85 break;
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86 } else if (!xch->ignore) {
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87 lxch = xch;
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88 ignored = 0;
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89 } else {
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90 ignored += xch->chg2;
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91 }
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92 }
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93
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94 return lxch;
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95 }
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96
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97
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98 #if 0
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99 static long def_ff(const char *rec, long len, char *buf, long sz, void *priv UNUSED)
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100 {
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101 if (len > 0 &&
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102 (isalpha((unsigned char)*rec) || /* identifier? */
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103 *rec == '_' || /* also identifier? */
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104 *rec == '$')) { /* identifiers from VMS and other esoterico */
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105 if (len > sz)
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106 len = sz;
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107 while (0 < len && isspace((unsigned char)rec[len - 1]))
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108 len--;
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109 memcpy(buf, rec, len);
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110 return len;
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111 }
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112 return -1;
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113 }
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114 #endif
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115
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116 #if 0
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117 static long match_func_rec(xdfile_t *xdf, xdemitconf_t const *xecfg, long ri,
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118 char *buf, long sz)
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119 {
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120 const char *rec;
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121 long len = xdl_get_rec(xdf, ri, &rec);
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122 if (!xecfg->find_func)
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123 return def_ff(rec, len, buf, sz, xecfg->find_func_priv);
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124 return xecfg->find_func(rec, len, buf, sz, xecfg->find_func_priv);
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125 }
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126 #endif
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127
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128 #if 0
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129 static int is_func_rec(xdfile_t *xdf, xdemitconf_t const *xecfg, long ri)
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130 {
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131 char dummy[1];
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132 return match_func_rec(xdf, xecfg, ri, dummy, sizeof(dummy)) >= 0;
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133 }
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134 #endif
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135
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136 struct func_line {
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137 long len;
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138 char buf[80];
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139 };
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140
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141 #if 0
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142 static long get_func_line(xdfenv_t *xe, xdemitconf_t const *xecfg,
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143 struct func_line *func_line, long start, long limit)
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144 {
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145 long l, size, step = (start > limit) ? -1 : 1;
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146 char *buf, dummy[1];
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147
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148 buf = func_line ? func_line->buf : dummy;
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149 size = func_line ? sizeof(func_line->buf) : sizeof(dummy);
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150
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151 for (l = start; l != limit && 0 <= l && l < xe->xdf1.nrec; l += step) {
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152 long len = match_func_rec(&xe->xdf1, xecfg, l, buf, size);
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153 if (len >= 0) {
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154 if (func_line)
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155 func_line->len = len;
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156 return l;
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157 }
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158 }
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159 return -1;
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160 }
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161 #endif
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162
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163 #if 0
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164 static int is_empty_rec(xdfile_t *xdf, long ri)
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165 {
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166 const char *rec;
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167 long len = xdl_get_rec(xdf, ri, &rec);
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168
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169 while (len > 0 && XDL_ISSPACE(*rec)) {
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170 rec++;
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171 len--;
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172 }
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173 return !len;
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174 }
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175 #endif
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176
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177 int xdl_emit_diff(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
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178 xdemitconf_t const *xecfg) {
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179 long s1, s2, e1, e2, lctx;
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180 xdchange_t *xch, *xche;
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181 #if 0
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182 long funclineprev = -1;
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183 #endif
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184 struct func_line func_line;
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185
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186 func_line.len = 0;
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187
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188 for (xch = xscr; xch; xch = xche->next) {
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189 xche = xdl_get_hunk(&xch, xecfg);
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190 if (!xch)
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191 break;
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192
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193 s1 = XDL_MAX(xch->i1 - xecfg->ctxlen, 0);
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194 s2 = XDL_MAX(xch->i2 - xecfg->ctxlen, 0);
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195
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196 #if 0
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197 if (xecfg->flags & XDL_EMIT_FUNCCONTEXT) {
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198 long fs1, i1 = xch->i1;
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199
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200 /* Appended chunk? */
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201 if (i1 >= xe->xdf1.nrec) {
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202 long i2 = xch->i2;
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203
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204 /*
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205 * We don't need additional context if
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206 * a whole function was added.
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207 */
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208 while (i2 < xe->xdf2.nrec) {
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209 if (is_func_rec(&xe->xdf2, xecfg, i2))
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210 goto post_context_calculation;
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diff changeset
211 i2++;
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212 }
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
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213
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diff changeset
214 /*
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215 * Otherwise get more context from the
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216 * pre-image.
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217 */
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218 i1 = xe->xdf1.nrec - 1;
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219 }
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220
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221 fs1 = get_func_line(xe, xecfg, NULL, i1, -1);
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222 while (fs1 > 0 && !is_empty_rec(&xe->xdf1, fs1 - 1) &&
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223 !is_func_rec(&xe->xdf1, xecfg, fs1 - 1))
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diff changeset
224 fs1--;
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225 if (fs1 < 0)
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226 fs1 = 0;
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diff changeset
227 if (fs1 < s1) {
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228 s2 -= s1 - fs1;
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229 s1 = fs1;
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230 }
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diff changeset
231 }
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
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diff changeset
232
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diff changeset
233 post_context_calculation:
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234 #endif
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235 lctx = xecfg->ctxlen;
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diff changeset
236 lctx = XDL_MIN(lctx, xe->xdf1.nrec - (xche->i1 + xche->chg1));
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diff changeset
237 lctx = XDL_MIN(lctx, xe->xdf2.nrec - (xche->i2 + xche->chg2));
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diff changeset
238
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diff changeset
239 e1 = xche->i1 + xche->chg1 + lctx;
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diff changeset
240 e2 = xche->i2 + xche->chg2 + lctx;
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diff changeset
241
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242 #if 0
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243 if (xecfg->flags & XDL_EMIT_FUNCCONTEXT) {
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diff changeset
244 long fe1 = get_func_line(xe, xecfg, NULL,
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diff changeset
245 xche->i1 + xche->chg1,
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diff changeset
246 xe->xdf1.nrec);
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diff changeset
247 while (fe1 > 0 && is_empty_rec(&xe->xdf1, fe1 - 1))
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diff changeset
248 fe1--;
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diff changeset
249 if (fe1 < 0)
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diff changeset
250 fe1 = xe->xdf1.nrec;
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diff changeset
251 if (fe1 > e1) {
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diff changeset
252 e2 += fe1 - e1;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
253 e1 = fe1;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
254 }
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
255
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
256 /*
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
257 * Overlap with next change? Then include it
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
258 * in the current hunk and start over to find
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
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parents:
diff changeset
259 * its new end.
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
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diff changeset
260 */
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
261 if (xche->next) {
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
262 long l = XDL_MIN(xche->next->i1,
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
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diff changeset
263 xe->xdf1.nrec - 1);
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
264 if (l - xecfg->ctxlen <= e1 ||
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
265 get_func_line(xe, xecfg, NULL, l, e1) < 0) {
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Christian Brabandt <cb@256bit.org>
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266 xche = xche->next;
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Christian Brabandt <cb@256bit.org>
parents:
diff changeset
267 goto post_context_calculation;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
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diff changeset
268 }
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
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parents:
diff changeset
269 }
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
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270 }
14708
0e336b7d2090 patch 8.1.0366: pieces of the xdiff code are not used
Christian Brabandt <cb@256bit.org>
parents: 14704
diff changeset
271 #endif
14696
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parents:
diff changeset
272
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
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diff changeset
273 /*
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Christian Brabandt <cb@256bit.org>
parents:
diff changeset
274 * Emit current hunk header.
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Christian Brabandt <cb@256bit.org>
parents:
diff changeset
275 */
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
276
14708
0e336b7d2090 patch 8.1.0366: pieces of the xdiff code are not used
Christian Brabandt <cb@256bit.org>
parents: 14704
diff changeset
277 #if 0
14696
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Christian Brabandt <cb@256bit.org>
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diff changeset
278 if (xecfg->flags & XDL_EMIT_FUNCNAMES) {
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
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diff changeset
279 get_func_line(xe, xecfg, &func_line,
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
280 s1 - 1, funclineprev);
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
281 funclineprev = s1 - 1;
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Christian Brabandt <cb@256bit.org>
parents:
diff changeset
282 }
14708
0e336b7d2090 patch 8.1.0366: pieces of the xdiff code are not used
Christian Brabandt <cb@256bit.org>
parents: 14704
diff changeset
283 #endif
14696
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
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diff changeset
284 if (xdl_emit_hunk_hdr(s1 + 1, e1 - s1, s2 + 1, e2 - s2,
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
285 func_line.buf, func_line.len, ecb) < 0)
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
286 return -1;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
287
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
288 /*
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
289 * Emit pre-context.
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
290 */
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
291 for (; s2 < xch->i2; s2++)
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
292 if (xdl_emit_record(&xe->xdf2, s2, " ", ecb) < 0)
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
293 return -1;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
294
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
295 for (s1 = xch->i1, s2 = xch->i2;; 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
296 /*
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
297 * Merge previous with current change atom.
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
298 */
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
299 for (; s1 < xch->i1 && s2 < xch->i2; s1++, s2++)
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
300 if (xdl_emit_record(&xe->xdf2, s2, " ", ecb) < 0)
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
301 return -1;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
302
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
303 /*
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
304 * Removes lines from the first file.
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
305 */
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
306 for (s1 = xch->i1; s1 < xch->i1 + xch->chg1; s1++)
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
307 if (xdl_emit_record(&xe->xdf1, s1, "-", ecb) < 0)
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
308 return -1;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
309
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
310 /*
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
311 * Adds lines from the second file.
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
312 */
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
313 for (s2 = xch->i2; s2 < xch->i2 + xch->chg2; s2++)
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
314 if (xdl_emit_record(&xe->xdf2, s2, "+", ecb) < 0)
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
315 return -1;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
316
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
317 if (xch == xche)
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
318 break;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
319 s1 = xch->i1 + xch->chg1;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
320 s2 = xch->i2 + xch->chg2;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
321 }
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
322
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
323 /*
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
324 * Emit post-context.
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
325 */
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
326 for (s2 = xche->i2 + xche->chg2; s2 < e2; s2++)
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
327 if (xdl_emit_record(&xe->xdf2, s2, " ", ecb) < 0)
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
328 return -1;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
329 }
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
330
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
331 return 0;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
332 }