Mercurial > hg
annotate mercurial/diffhelpers.c @ 22806:65ccc733d58e
getlogrevs: remove user of baseset.append
A `baseset` has multiple cached results and will get even more in the future.
Making it an object "populated once" like the other smartsets makes it both safer
and simpler. The append method will be removed at some point.
author | Pierre-Yves David <pierre-yves.david@fb.com> |
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date | Tue, 07 Oct 2014 00:04:16 -0700 |
parents | 0a0933d3d59c |
children | c8e7fa41bfc5 |
rev | line source |
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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 |
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38 if (c == ' ' || c == '+') { |
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39 PyObject *rline = PyBytes_FromStringAndSize(l + 1, sz - 2); |
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40 PyList_SetItem(b, blen-1, rline); |
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41 } |
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42 if (c == ' ' || c == '-') { |
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43 Py_INCREF(hline); |
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44 PyList_SetItem(a, alen-1, hline); |
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45 } |
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46 PyList_SetItem(hunk, hunksz-1, hline); |
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47 } |
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48 |
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49 /* python callable form of _fix_newline */ |
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50 static PyObject * |
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51 fix_newline(PyObject *self, PyObject *args) |
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52 { |
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53 PyObject *hunk, *a, *b; |
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54 if (!PyArg_ParseTuple(args, "OOO", &hunk, &a, &b)) |
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55 return NULL; |
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56 _fix_newline(hunk, a, b); |
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57 return Py_BuildValue("l", 0); |
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58 } |
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59 |
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60 #if (PY_VERSION_HEX < 0x02050000) |
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61 static const char *addlines_format = "OOiiOO"; |
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62 #else |
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63 static const char *addlines_format = "OOnnOO"; |
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64 #endif |
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65 |
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66 /* |
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67 * read lines from fp into the hunk. The hunk is parsed into two arrays |
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68 * a and b. a gets the old state of the text, b gets the new state |
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69 * The control char from the hunk is saved when inserting into a, but not b |
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70 * (for performance while deleting files) |
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71 */ |
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72 static PyObject * |
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73 addlines(PyObject *self, PyObject *args) |
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74 { |
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75 |
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76 PyObject *fp, *hunk, *a, *b, *x; |
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77 Py_ssize_t i; |
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78 Py_ssize_t lena, lenb; |
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79 Py_ssize_t num; |
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80 Py_ssize_t todoa, todob; |
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81 char *s, c; |
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82 PyObject *l; |
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83 if (!PyArg_ParseTuple(args, addlines_format, |
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84 &fp, &hunk, &lena, &lenb, &a, &b)) |
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85 return NULL; |
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86 |
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87 while (1) { |
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88 todoa = lena - PyList_Size(a); |
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89 todob = lenb - PyList_Size(b); |
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90 num = todoa > todob ? todoa : todob; |
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91 if (num == 0) |
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92 break; |
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93 for (i = 0; i < num; i++) { |
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94 x = PyFile_GetLine(fp, 0); |
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95 s = PyBytes_AsString(x); |
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96 c = *s; |
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97 if (strcmp(s, "\\ No newline at end of file\n") == 0) { |
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98 _fix_newline(hunk, a, b); |
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99 continue; |
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100 } |
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101 if (c == '\n') { |
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102 /* Some patches may be missing the control char |
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103 * on empty lines. Supply a leading space. */ |
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104 Py_DECREF(x); |
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105 x = PyBytes_FromString(" \n"); |
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106 } |
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107 PyList_Append(hunk, x); |
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108 if (c == '+') { |
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109 l = PyBytes_FromString(s + 1); |
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110 PyList_Append(b, l); |
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111 Py_DECREF(l); |
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112 } else if (c == '-') { |
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113 PyList_Append(a, x); |
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114 } else { |
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115 l = PyBytes_FromString(s + 1); |
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116 PyList_Append(b, l); |
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117 Py_DECREF(l); |
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118 PyList_Append(a, x); |
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119 } |
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120 Py_DECREF(x); |
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121 } |
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122 } |
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123 return Py_BuildValue("l", 0); |
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124 } |
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125 |
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126 /* |
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127 * compare the lines in a with the lines in b. a is assumed to have |
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128 * a control char at the start of each line, this char is ignored in the |
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129 * compare |
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130 */ |
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131 static PyObject * |
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132 testhunk(PyObject *self, PyObject *args) |
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133 { |
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134 |
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135 PyObject *a, *b; |
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136 long bstart; |
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137 Py_ssize_t alen, blen; |
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138 Py_ssize_t i; |
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139 char *sa, *sb; |
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140 |
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141 if (!PyArg_ParseTuple(args, "OOl", &a, &b, &bstart)) |
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142 return NULL; |
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143 alen = PyList_Size(a); |
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144 blen = PyList_Size(b); |
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145 if (alen > blen - bstart || bstart < 0) { |
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146 return Py_BuildValue("l", -1); |
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147 } |
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148 for (i = 0; i < alen; i++) { |
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149 sa = PyBytes_AsString(PyList_GET_ITEM(a, i)); |
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150 sb = PyBytes_AsString(PyList_GET_ITEM(b, i + bstart)); |
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151 if (strcmp(sa + 1, sb) != 0) |
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152 return Py_BuildValue("l", -1); |
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153 } |
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154 return Py_BuildValue("l", 0); |
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155 } |
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156 |
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157 static PyMethodDef methods[] = { |
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158 {"addlines", addlines, METH_VARARGS, "add lines to a hunk\n"}, |
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159 {"fix_newline", fix_newline, METH_VARARGS, "fixup newline counters\n"}, |
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160 {"testhunk", testhunk, METH_VARARGS, "test lines in a hunk\n"}, |
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161 {NULL, NULL} |
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162 }; |
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163 |
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164 #ifdef IS_PY3K |
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165 static struct PyModuleDef diffhelpers_module = { |
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166 PyModuleDef_HEAD_INIT, |
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167 "diffhelpers", |
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168 diffhelpers_doc, |
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169 -1, |
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170 methods |
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171 }; |
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172 |
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173 PyMODINIT_FUNC PyInit_diffhelpers(void) |
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174 { |
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175 PyObject *m; |
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176 |
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177 m = PyModule_Create(&diffhelpers_module); |
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178 if (m == NULL) |
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179 return NULL; |
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180 |
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181 diffhelpers_Error = PyErr_NewException("diffhelpers.diffhelpersError", |
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182 NULL, NULL); |
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183 Py_INCREF(diffhelpers_Error); |
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184 PyModule_AddObject(m, "diffhelpersError", diffhelpers_Error); |
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185 |
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186 return m; |
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187 } |
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188 #else |
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189 PyMODINIT_FUNC |
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190 initdiffhelpers(void) |
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191 { |
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192 Py_InitModule3("diffhelpers", methods, diffhelpers_doc); |
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193 diffhelpers_Error = PyErr_NewException("diffhelpers.diffhelpersError", |
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194 NULL, NULL); |
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195 } |
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196 #endif |
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197 |