Mercurial > hg
annotate mercurial/diffhelpers.c @ 26610:f9f82c444ff7
filemerge: only copy to backup during premerge step
The premerge might leave the original file in an unclean state. Therefore it's
important to only copy the file in the beginning.
author | Siddharth Agarwal <sid0@fb.com> |
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date | Sun, 11 Oct 2015 20:04:40 -0700 |
parents | f1c127df7c4f |
children | 2f51f4c535d2 |
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1 /* |
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2 * diffhelpers.c - helper routines for mpatch |
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3 * |
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4 * Copyright 2007 Chris Mason <chris.mason@oracle.com> |
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5 * |
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6 * This software may be used and distributed according to the terms |
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7 * of the GNU General Public License v2, incorporated herein by reference. |
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8 */ |
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9 |
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10 #include <Python.h> |
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11 #include <stdlib.h> |
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12 #include <string.h> |
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13 |
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14 #include "util.h" |
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15 |
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16 static char diffhelpers_doc[] = "Efficient diff parsing"; |
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17 static PyObject *diffhelpers_Error; |
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18 |
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19 |
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20 /* fixup the last lines of a and b when the patch has no newline at eof */ |
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21 static void _fix_newline(PyObject *hunk, PyObject *a, PyObject *b) |
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22 { |
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23 Py_ssize_t hunksz = PyList_Size(hunk); |
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24 PyObject *s = PyList_GET_ITEM(hunk, hunksz-1); |
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25 char *l = PyBytes_AsString(s); |
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26 Py_ssize_t alen = PyList_Size(a); |
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27 Py_ssize_t blen = PyList_Size(b); |
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28 char c = l[0]; |
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29 PyObject *hline; |
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30 Py_ssize_t sz = PyBytes_GET_SIZE(s); |
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31 |
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32 if (sz > 1 && l[sz-2] == '\r') |
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33 /* tolerate CRLF in last line */ |
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34 sz -= 1; |
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35 |
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36 hline = PyBytes_FromStringAndSize(l, sz-1); |
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37 if (!hline) { |
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38 return; |
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39 } |
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40 |
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41 if (c == ' ' || c == '+') { |
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42 PyObject *rline = PyBytes_FromStringAndSize(l + 1, sz - 2); |
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43 PyList_SetItem(b, blen-1, rline); |
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44 } |
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45 if (c == ' ' || c == '-') { |
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46 Py_INCREF(hline); |
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47 PyList_SetItem(a, alen-1, hline); |
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48 } |
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49 PyList_SetItem(hunk, hunksz-1, hline); |
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50 } |
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51 |
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52 /* python callable form of _fix_newline */ |
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53 static PyObject * |
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54 fix_newline(PyObject *self, PyObject *args) |
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55 { |
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56 PyObject *hunk, *a, *b; |
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57 if (!PyArg_ParseTuple(args, "OOO", &hunk, &a, &b)) |
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58 return NULL; |
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59 _fix_newline(hunk, a, b); |
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60 return Py_BuildValue("l", 0); |
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61 } |
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62 |
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63 #if (PY_VERSION_HEX < 0x02050000) |
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64 static const char *addlines_format = "OOiiOO"; |
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65 #else |
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66 static const char *addlines_format = "OOnnOO"; |
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67 #endif |
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68 |
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69 /* |
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70 * read lines from fp into the hunk. The hunk is parsed into two arrays |
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71 * a and b. a gets the old state of the text, b gets the new state |
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72 * The control char from the hunk is saved when inserting into a, but not b |
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73 * (for performance while deleting files) |
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74 */ |
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75 static PyObject * |
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76 addlines(PyObject *self, PyObject *args) |
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77 { |
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78 |
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79 PyObject *fp, *hunk, *a, *b, *x; |
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80 Py_ssize_t i; |
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81 Py_ssize_t lena, lenb; |
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82 Py_ssize_t num; |
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83 Py_ssize_t todoa, todob; |
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84 char *s, c; |
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85 PyObject *l; |
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86 if (!PyArg_ParseTuple(args, addlines_format, |
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87 &fp, &hunk, &lena, &lenb, &a, &b)) |
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88 return NULL; |
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89 |
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90 while (1) { |
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91 todoa = lena - PyList_Size(a); |
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92 todob = lenb - PyList_Size(b); |
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93 num = todoa > todob ? todoa : todob; |
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94 if (num == 0) |
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95 break; |
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96 for (i = 0; i < num; i++) { |
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97 x = PyFile_GetLine(fp, 0); |
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98 s = PyBytes_AsString(x); |
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99 c = *s; |
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100 if (strcmp(s, "\\ No newline at end of file\n") == 0) { |
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101 _fix_newline(hunk, a, b); |
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102 continue; |
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103 } |
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104 if (c == '\n') { |
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105 /* Some patches may be missing the control char |
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106 * on empty lines. Supply a leading space. */ |
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107 Py_DECREF(x); |
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108 x = PyBytes_FromString(" \n"); |
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109 } |
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110 PyList_Append(hunk, x); |
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111 if (c == '+') { |
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112 l = PyBytes_FromString(s + 1); |
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113 PyList_Append(b, l); |
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114 Py_DECREF(l); |
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115 } else if (c == '-') { |
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116 PyList_Append(a, x); |
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117 } else { |
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118 l = PyBytes_FromString(s + 1); |
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119 PyList_Append(b, l); |
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120 Py_DECREF(l); |
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121 PyList_Append(a, x); |
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122 } |
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123 Py_DECREF(x); |
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124 } |
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125 } |
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126 return Py_BuildValue("l", 0); |
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127 } |
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128 |
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129 /* |
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130 * compare the lines in a with the lines in b. a is assumed to have |
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131 * a control char at the start of each line, this char is ignored in the |
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132 * compare |
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133 */ |
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134 static PyObject * |
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135 testhunk(PyObject *self, PyObject *args) |
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136 { |
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137 |
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138 PyObject *a, *b; |
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139 long bstart; |
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140 Py_ssize_t alen, blen; |
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141 Py_ssize_t i; |
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142 char *sa, *sb; |
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143 |
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144 if (!PyArg_ParseTuple(args, "OOl", &a, &b, &bstart)) |
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145 return NULL; |
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146 alen = PyList_Size(a); |
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147 blen = PyList_Size(b); |
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148 if (alen > blen - bstart || bstart < 0) { |
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149 return Py_BuildValue("l", -1); |
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150 } |
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151 for (i = 0; i < alen; i++) { |
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152 sa = PyBytes_AsString(PyList_GET_ITEM(a, i)); |
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153 sb = PyBytes_AsString(PyList_GET_ITEM(b, i + bstart)); |
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154 if (strcmp(sa + 1, sb) != 0) |
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155 return Py_BuildValue("l", -1); |
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156 } |
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157 return Py_BuildValue("l", 0); |
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158 } |
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159 |
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160 static PyMethodDef methods[] = { |
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161 {"addlines", addlines, METH_VARARGS, "add lines to a hunk\n"}, |
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162 {"fix_newline", fix_newline, METH_VARARGS, "fixup newline counters\n"}, |
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163 {"testhunk", testhunk, METH_VARARGS, "test lines in a hunk\n"}, |
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164 {NULL, NULL} |
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165 }; |
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166 |
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167 #ifdef IS_PY3K |
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168 static struct PyModuleDef diffhelpers_module = { |
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169 PyModuleDef_HEAD_INIT, |
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170 "diffhelpers", |
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171 diffhelpers_doc, |
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172 -1, |
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173 methods |
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174 }; |
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175 |
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176 PyMODINIT_FUNC PyInit_diffhelpers(void) |
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177 { |
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178 PyObject *m; |
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179 |
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180 m = PyModule_Create(&diffhelpers_module); |
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181 if (m == NULL) |
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182 return NULL; |
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183 |
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184 diffhelpers_Error = PyErr_NewException("diffhelpers.diffhelpersError", |
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185 NULL, NULL); |
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186 Py_INCREF(diffhelpers_Error); |
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187 PyModule_AddObject(m, "diffhelpersError", diffhelpers_Error); |
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188 |
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189 return m; |
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190 } |
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191 #else |
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192 PyMODINIT_FUNC |
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193 initdiffhelpers(void) |
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194 { |
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195 Py_InitModule3("diffhelpers", methods, diffhelpers_doc); |
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196 diffhelpers_Error = PyErr_NewException("diffhelpers.diffhelpersError", |
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197 NULL, NULL); |
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198 } |
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199 #endif |