Mercurial > hg
annotate mercurial/cext/bdiff.c @ 51381:1d488f7be492
crecord: add `content` properties to all nodes
In order to have a unified API of what can be searched, let's provide
a `content` property to each node type. This way we can search
filenames, context headers (e.g. containing function names, if
deducible from patch context) or changed lines themselves.
author | Jordi Gutiérrez Hermoso <jordigh@octave.org> |
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date | Wed, 14 Feb 2024 22:43:51 -0500 |
parents | b0dd39b91e7a |
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rev | line source |
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1 /* |
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2 bdiff.c - efficient binary diff extension for Mercurial |
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3 |
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4 Copyright 2005, 2006 Olivia Mackall <olivia@selenic.com> |
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5 |
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6 This software may be used and distributed according to the terms of |
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7 the GNU General Public License, incorporated herein by reference. |
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8 |
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9 Based roughly on Python difflib |
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10 */ |
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11 |
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12 #define PY_SSIZE_T_CLEAN |
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13 #include <Python.h> |
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14 #include <limits.h> |
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15 #include <stdlib.h> |
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16 #include <string.h> |
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17 |
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18 #include "bdiff.h" |
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19 #include "bitmanipulation.h" |
36675 | 20 #include "thirdparty/xdiff/xdiff.h" |
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21 #include "util.h" |
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22 |
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23 static PyObject *blocks(PyObject *self, PyObject *args) |
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24 { |
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25 PyObject *sa, *sb, *rl = NULL, *m; |
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26 struct bdiff_line *a, *b; |
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27 struct bdiff_hunk l, *h; |
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28 int an, bn, count, pos = 0; |
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29 |
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30 l.next = NULL; |
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31 |
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32 if (!PyArg_ParseTuple(args, "SS:bdiff", &sa, &sb)) { |
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33 return NULL; |
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34 } |
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35 |
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36 an = bdiff_splitlines(PyBytes_AsString(sa), PyBytes_Size(sa), &a); |
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37 bn = bdiff_splitlines(PyBytes_AsString(sb), PyBytes_Size(sb), &b); |
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38 |
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39 if (!a || !b) { |
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40 goto nomem; |
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41 } |
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42 |
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43 count = bdiff_diff(a, an, b, bn, &l); |
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44 if (count < 0) { |
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45 goto nomem; |
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46 } |
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47 |
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48 rl = PyList_New(count); |
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49 if (!rl) { |
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50 goto nomem; |
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51 } |
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52 |
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53 for (h = l.next; h; h = h->next) { |
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54 m = Py_BuildValue("iiii", h->a1, h->a2, h->b1, h->b2); |
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55 PyList_SetItem(rl, pos, m); |
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56 pos++; |
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57 } |
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58 |
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59 nomem: |
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60 free(a); |
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61 free(b); |
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62 bdiff_freehunks(l.next); |
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63 return rl ? rl : PyErr_NoMemory(); |
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64 } |
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65 |
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66 static PyObject *bdiff(PyObject *self, PyObject *args) |
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67 { |
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68 Py_buffer ba, bb; |
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69 char *rb, *ia, *ib; |
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70 PyObject *result = NULL; |
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71 struct bdiff_line *al = NULL, *bl = NULL; |
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72 struct bdiff_hunk l, *h; |
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73 int an, bn, count; |
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74 Py_ssize_t len = 0, la, lb, li = 0, lcommon = 0, lmax; |
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75 PyThreadState *_save = NULL; |
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76 |
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77 l.next = NULL; |
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78 |
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79 if (!PyArg_ParseTuple(args, "y*y*:bdiff", &ba, &bb)) { |
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80 return NULL; |
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81 } |
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82 |
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83 if (!PyBuffer_IsContiguous(&ba, 'C') || ba.ndim > 1) { |
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84 PyErr_SetString(PyExc_ValueError, "bdiff input not contiguous"); |
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85 goto cleanup; |
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86 } |
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87 |
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88 if (!PyBuffer_IsContiguous(&bb, 'C') || bb.ndim > 1) { |
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89 PyErr_SetString(PyExc_ValueError, "bdiff input not contiguous"); |
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90 goto cleanup; |
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91 } |
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92 |
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93 la = ba.len; |
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94 lb = bb.len; |
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95 |
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96 if (la > UINT_MAX || lb > UINT_MAX) { |
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97 PyErr_SetString(PyExc_ValueError, "bdiff inputs too large"); |
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98 goto cleanup; |
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99 } |
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100 |
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101 _save = PyEval_SaveThread(); |
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102 |
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103 lmax = la > lb ? lb : la; |
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104 for (ia = ba.buf, ib = bb.buf; li < lmax && *ia == *ib; |
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105 ++li, ++ia, ++ib) { |
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106 if (*ia == '\n') { |
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107 lcommon = li + 1; |
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108 } |
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109 } |
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110 /* we can almost add: if (li == lmax) lcommon = li; */ |
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111 |
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Matt Harbison <matt_harbison@yahoo.com>
parents:
36675
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changeset
|
112 an = bdiff_splitlines((char *)ba.buf + lcommon, la - lcommon, &al); |
340e4b711df7
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|
113 bn = bdiff_splitlines((char *)bb.buf + lcommon, lb - lcommon, &bl); |
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Gregory Szorc <gregory.szorc@gmail.com>
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changeset
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114 if (!al || !bl) { |
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115 PyErr_NoMemory(); |
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116 goto cleanup; |
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|
117 } |
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118 |
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119 count = bdiff_diff(al, an, bl, bn, &l); |
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Gregory Szorc <gregory.szorc@gmail.com>
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120 if (count < 0) { |
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121 PyErr_NoMemory(); |
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122 goto cleanup; |
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123 } |
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124 |
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125 /* calculate length of output */ |
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126 la = lb = 0; |
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127 for (h = l.next; h; h = h->next) { |
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128 if (h->a1 != la || h->b1 != lb) { |
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129 len += 12 + bl[h->b1].l - bl[lb].l; |
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130 } |
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131 la = h->a2; |
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132 lb = h->b2; |
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133 } |
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134 PyEval_RestoreThread(_save); |
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135 _save = NULL; |
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136 |
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137 result = PyBytes_FromStringAndSize(NULL, len); |
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138 |
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139 if (!result) { |
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140 goto cleanup; |
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141 } |
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142 |
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143 /* build binary patch */ |
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144 rb = PyBytes_AsString(result); |
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145 la = lb = 0; |
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146 |
9631ff5ebbeb
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147 for (h = l.next; h; h = h->next) { |
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148 if (h->a1 != la || h->b1 != lb) { |
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149 len = bl[h->b1].l - bl[lb].l; |
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bdiff: early pruning of common prefix before doing expensive computations
Mads Kiilerich <madski@unity3d.com>
parents:
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150 putbe32((uint32_t)(al[la].l + lcommon - al->l), rb); |
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151 putbe32((uint32_t)(al[h->a1].l + lcommon - al->l), |
b4fdc6177b29
bdiff: add to clang-format oversight
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|
152 rb + 4); |
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153 putbe32((uint32_t)len, rb + 8); |
9631ff5ebbeb
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154 memcpy(rb + 12, bl[lb].l, len); |
9631ff5ebbeb
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155 rb += 12 + len; |
9631ff5ebbeb
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|
156 } |
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157 la = h->a2; |
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158 lb = h->b2; |
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changeset
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159 } |
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160 |
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161 cleanup: |
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Augie Fackler <augie@google.com>
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|
162 if (_save) { |
29541
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|
163 PyEval_RestoreThread(_save); |
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|
164 } |
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Gregory Szorc <gregory.szorc@gmail.com>
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|
165 PyBuffer_Release(&ba); |
68026dd7c4f9
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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changeset
|
166 PyBuffer_Release(&bb); |
38301
d9e87566f879
cext: stop worrying and love the free(NULL)
Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
parents:
37980
diff
changeset
|
167 free(al); |
d9e87566f879
cext: stop worrying and love the free(NULL)
Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
parents:
37980
diff
changeset
|
168 free(bl); |
38309
93b812d5b818
bdiff: one more safe call of bdiff_freehunks(NULL)
Yuya Nishihara <yuya@tcha.org>
parents:
38301
diff
changeset
|
169 bdiff_freehunks(l.next); |
36654
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170 return result; |
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171 } |
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parents:
diff
changeset
|
172 |
9631ff5ebbeb
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parents:
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changeset
|
173 /* |
9631ff5ebbeb
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changeset
|
174 * If allws != 0, remove all whitespace (' ', \t and \r). Otherwise, |
9631ff5ebbeb
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175 * reduce whitespace sequences to a single space and trim remaining whitespace |
9631ff5ebbeb
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changeset
|
176 * from end of lines. |
9631ff5ebbeb
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|
177 */ |
9631ff5ebbeb
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parents:
diff
changeset
|
178 static PyObject *fixws(PyObject *self, PyObject *args) |
9631ff5ebbeb
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Maciej Fijalkowski <fijall@gmail.com>
parents:
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changeset
|
179 { |
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changeset
|
180 PyObject *s, *result = NULL; |
9631ff5ebbeb
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|
181 char allws, c; |
9631ff5ebbeb
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Maciej Fijalkowski <fijall@gmail.com>
parents:
diff
changeset
|
182 const char *r; |
9631ff5ebbeb
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Maciej Fijalkowski <fijall@gmail.com>
parents:
diff
changeset
|
183 Py_ssize_t i, rlen, wlen = 0; |
9631ff5ebbeb
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Maciej Fijalkowski <fijall@gmail.com>
parents:
diff
changeset
|
184 char *w; |
9631ff5ebbeb
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diff
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|
185 |
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Augie Fackler <augie@google.com>
parents:
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changeset
|
186 if (!PyArg_ParseTuple(args, "Sb:fixws", &s, &allws)) { |
29541
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parents:
diff
changeset
|
187 return NULL; |
41336
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cleanup: use clang-tidy to add missing {} around one-line statements
Augie Fackler <augie@google.com>
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|
188 } |
29541
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Maciej Fijalkowski <fijall@gmail.com>
parents:
diff
changeset
|
189 r = PyBytes_AsString(s); |
9631ff5ebbeb
bdiff: split bdiff into cpy-aware and cpy-agnostic part
Maciej Fijalkowski <fijall@gmail.com>
parents:
diff
changeset
|
190 rlen = PyBytes_Size(s); |
9631ff5ebbeb
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Maciej Fijalkowski <fijall@gmail.com>
parents:
diff
changeset
|
191 |
31467
08ecec297521
bdiff: use Python memory allocator in fixws
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
192 w = (char *)PyMem_Malloc(rlen ? rlen : 1); |
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cleanup: use clang-tidy to add missing {} around one-line statements
Augie Fackler <augie@google.com>
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|
193 if (!w) { |
29541
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Maciej Fijalkowski <fijall@gmail.com>
parents:
diff
changeset
|
194 goto nomem; |
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Augie Fackler <augie@google.com>
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|
195 } |
29541
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parents:
diff
changeset
|
196 |
9631ff5ebbeb
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parents:
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changeset
|
197 for (i = 0; i != rlen; i++) { |
9631ff5ebbeb
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parents:
diff
changeset
|
198 c = r[i]; |
9631ff5ebbeb
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diff
changeset
|
199 if (c == ' ' || c == '\t' || c == '\r') { |
41336
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Augie Fackler <augie@google.com>
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|
200 if (!allws && (wlen == 0 || w[wlen - 1] != ' ')) { |
29541
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parents:
diff
changeset
|
201 w[wlen++] = ' '; |
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Augie Fackler <augie@google.com>
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|
202 } |
36055
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Augie Fackler <augie@google.com>
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34438
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|
203 } else if (c == '\n' && !allws && wlen > 0 && |
b4fdc6177b29
bdiff: add to clang-format oversight
Augie Fackler <augie@google.com>
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34438
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changeset
|
204 w[wlen - 1] == ' ') { |
29541
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parents:
diff
changeset
|
205 w[wlen - 1] = '\n'; |
9631ff5ebbeb
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diff
changeset
|
206 } else { |
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changeset
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207 w[wlen++] = c; |
9631ff5ebbeb
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diff
changeset
|
208 } |
9631ff5ebbeb
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diff
changeset
|
209 } |
9631ff5ebbeb
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parents:
diff
changeset
|
210 |
9631ff5ebbeb
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diff
changeset
|
211 result = PyBytes_FromStringAndSize(w, wlen); |
9631ff5ebbeb
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parents:
diff
changeset
|
212 |
9631ff5ebbeb
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parents:
diff
changeset
|
213 nomem: |
31467
08ecec297521
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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changeset
|
214 PyMem_Free(w); |
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|
215 return result ? result : PyErr_NoMemory(); |
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diff
changeset
|
216 } |
9631ff5ebbeb
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diff
changeset
|
217 |
36146
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bdiff: write a native version of splitnewlines
Augie Fackler <augie@google.com>
parents:
36055
diff
changeset
|
218 static bool sliceintolist(PyObject *list, Py_ssize_t destidx, |
29dd37a418aa
bdiff: write a native version of splitnewlines
Augie Fackler <augie@google.com>
parents:
36055
diff
changeset
|
219 const char *source, Py_ssize_t len) |
29dd37a418aa
bdiff: write a native version of splitnewlines
Augie Fackler <augie@google.com>
parents:
36055
diff
changeset
|
220 { |
29dd37a418aa
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Augie Fackler <augie@google.com>
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changeset
|
221 PyObject *sliced = PyBytes_FromStringAndSize(source, len); |
41336
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cleanup: use clang-tidy to add missing {} around one-line statements
Augie Fackler <augie@google.com>
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|
222 if (sliced == NULL) { |
36146
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bdiff: write a native version of splitnewlines
Augie Fackler <augie@google.com>
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|
223 return false; |
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Augie Fackler <augie@google.com>
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|
224 } |
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225 PyList_SET_ITEM(list, destidx, sliced); |
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226 return true; |
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227 } |
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228 |
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229 static PyObject *splitnewlines(PyObject *self, PyObject *args) |
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230 { |
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231 const char *text; |
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232 Py_ssize_t nelts = 0, size, i, start = 0; |
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233 PyObject *result = NULL; |
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234 |
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235 if (!PyArg_ParseTuple(args, "y#", &text, &size)) { |
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236 goto abort; |
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237 } |
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238 if (!size) { |
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239 return PyList_New(0); |
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240 } |
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241 /* This loops to size-1 because if the last byte is a newline, |
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242 * we don't want to perform a split there. */ |
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243 for (i = 0; i < size - 1; ++i) { |
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244 if (text[i] == '\n') { |
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245 ++nelts; |
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246 } |
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247 } |
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248 if ((result = PyList_New(nelts + 1)) == NULL) { |
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249 goto abort; |
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250 } |
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251 nelts = 0; |
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252 for (i = 0; i < size - 1; ++i) { |
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253 if (text[i] == '\n') { |
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254 if (!sliceintolist(result, nelts++, text + start, |
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255 i - start + 1)) { |
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256 goto abort; |
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257 } |
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258 start = i + 1; |
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259 } |
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260 } |
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261 if (!sliceintolist(result, nelts++, text + start, size - start)) { |
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262 goto abort; |
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263 } |
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264 return result; |
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265 abort: |
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266 Py_XDECREF(result); |
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267 return NULL; |
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268 } |
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269 |
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270 static int hunk_consumer(int64_t a1, int64_t a2, int64_t b1, int64_t b2, |
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271 void *priv) |
36675 | 272 { |
273 PyObject *rl = (PyObject *)priv; | |
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274 PyObject *m = Py_BuildValue("LLLL", a1, a2, b1, b2); |
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275 int r; |
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276 if (!m) { |
36675 | 277 return -1; |
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278 } |
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279 r = PyList_Append(rl, m); |
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280 Py_DECREF(m); |
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281 return r; |
36675 | 282 } |
283 | |
284 static PyObject *xdiffblocks(PyObject *self, PyObject *args) | |
285 { | |
286 Py_ssize_t la, lb; | |
287 mmfile_t a, b; | |
288 PyObject *rl; | |
289 | |
290 xpparam_t xpp = { | |
291 XDF_INDENT_HEURISTIC, /* flags */ | |
292 }; | |
293 xdemitconf_t xecfg = { | |
294 XDL_EMIT_BDIFFHUNK, /* flags */ | |
295 hunk_consumer, /* hunk_consume_func */ | |
296 }; | |
297 xdemitcb_t ecb = { | |
298 NULL, /* priv */ | |
299 }; | |
300 | |
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301 if (!PyArg_ParseTuple(args, "y#y#", &a.ptr, &la, &b.ptr, &lb)) { |
36675 | 302 return NULL; |
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303 } |
36675 | 304 |
305 a.size = la; | |
306 b.size = lb; | |
307 | |
308 rl = PyList_New(0); | |
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309 if (!rl) { |
36675 | 310 return PyErr_NoMemory(); |
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311 } |
36675 | 312 |
313 ecb.priv = rl; | |
314 | |
315 if (xdl_diff(&a, &b, &xpp, &xecfg, &ecb) != 0) { | |
316 Py_DECREF(rl); | |
317 return PyErr_NoMemory(); | |
318 } | |
319 | |
320 return rl; | |
321 } | |
322 | |
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323 static char mdiff_doc[] = "Efficient binary diff."; |
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324 |
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325 static PyMethodDef methods[] = { |
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326 {"bdiff", bdiff, METH_VARARGS, "calculate a binary diff\n"}, |
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327 {"blocks", blocks, METH_VARARGS, "find a list of matching lines\n"}, |
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328 {"fixws", fixws, METH_VARARGS, "normalize diff whitespaces\n"}, |
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329 {"splitnewlines", splitnewlines, METH_VARARGS, |
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330 "like str.splitlines, but only split on newlines\n"}, |
36675 | 331 {"xdiffblocks", xdiffblocks, METH_VARARGS, |
332 "find a list of matching lines using xdiff algorithm\n"}, | |
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333 {NULL, NULL}, |
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334 }; |
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335 |
36675 | 336 static const int version = 3; |
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337 |
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338 static struct PyModuleDef bdiff_module = { |
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339 PyModuleDef_HEAD_INIT, "bdiff", mdiff_doc, -1, methods, |
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340 }; |
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341 |
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342 PyMODINIT_FUNC PyInit_bdiff(void) |
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343 { |
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344 PyObject *m; |
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345 m = PyModule_Create(&bdiff_module); |
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346 PyModule_AddIntConstant(m, "version", version); |
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347 return m; |
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348 } |