Mercurial > hg > mercurial-crew-with-dirclash
annotate mercurial/diffhelpers.c @ 5197:55860a45bbf2
Enable demandimport only in scripts, not in importable modules (issue605)
This way other applications can choose if and when they want this feature,
because it might be problematic if those applications rely on ImportError.
author | Thomas Arendsen Hein <thomas@intevation.de> |
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date | Sat, 18 Aug 2007 11:37:08 +0200 |
parents | 4574925db5c0 |
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rev | line source |
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4897
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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 static char diffhelpers_doc[] = "Efficient diff parsing"; |
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15 static PyObject *diffhelpers_Error; |
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16 |
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17 |
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18 /* fixup the last lines of a and b when the patch has no newline at eof */ |
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19 static void _fix_newline(PyObject *hunk, PyObject *a, PyObject *b) |
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20 { |
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21 int hunksz = PyList_Size(hunk); |
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22 PyObject *s = PyList_GET_ITEM(hunk, hunksz-1); |
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23 char *l = PyString_AS_STRING(s); |
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24 int sz = PyString_GET_SIZE(s); |
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25 int alen = PyList_Size(a); |
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26 int blen = PyList_Size(b); |
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27 char c = l[0]; |
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28 |
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29 PyObject *hline = PyString_FromStringAndSize(l, sz-1); |
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30 if (c == ' ' || c == '+') { |
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31 PyObject *rline = PyString_FromStringAndSize(l+1, sz-2); |
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32 PyList_SetItem(b, blen-1, rline); |
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33 } |
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34 if (c == ' ' || c == '-') { |
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35 Py_INCREF(hline); |
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36 PyList_SetItem(a, alen-1, hline); |
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37 } |
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38 PyList_SetItem(hunk, hunksz-1, hline); |
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39 } |
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40 |
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41 /* python callable form of _fix_newline */ |
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42 static PyObject * |
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43 fix_newline(PyObject *self, PyObject *args) |
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44 { |
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45 PyObject *hunk, *a, *b; |
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46 if (!PyArg_ParseTuple(args, "OOO", &hunk, &a, &b)) |
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47 return NULL; |
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48 _fix_newline(hunk, a, b); |
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49 return Py_BuildValue("l", 0); |
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50 } |
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51 |
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52 /* |
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53 * read lines from fp into the hunk. The hunk is parsed into two arrays |
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54 * a and b. a gets the old state of the text, b gets the new state |
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55 * The control char from the hunk is saved when inserting into a, but not b |
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56 * (for performance while deleting files) |
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57 */ |
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58 static PyObject * |
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59 addlines(PyObject *self, PyObject *args) |
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60 { |
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61 |
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62 PyObject *fp, *hunk, *a, *b, *x; |
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63 int i; |
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64 int lena, lenb; |
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65 int num; |
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66 int todoa, todob; |
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67 char *s, c; |
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68 PyObject *l; |
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69 if (!PyArg_ParseTuple(args, "OOiiOO", &fp, &hunk, &lena, &lenb, &a, &b)) |
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70 return NULL; |
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71 |
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72 while(1) { |
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73 todoa = lena - PyList_Size(a); |
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74 todob = lenb - PyList_Size(b); |
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75 num = todoa > todob ? todoa : todob; |
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76 if (num == 0) |
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77 break; |
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78 for (i = 0 ; i < num ; i++) { |
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79 x = PyFile_GetLine(fp, 0); |
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80 s = PyString_AS_STRING(x); |
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81 c = *s; |
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82 if (strcmp(s, "\\ No newline at end of file\n") == 0) { |
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83 _fix_newline(hunk, a, b); |
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84 continue; |
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85 } |
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86 PyList_Append(hunk, x); |
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87 if (c == '+') { |
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88 l = PyString_FromString(s + 1); |
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89 PyList_Append(b, l); |
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90 Py_DECREF(l); |
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91 } else if (c == '-') { |
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92 PyList_Append(a, x); |
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93 } else { |
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94 l = PyString_FromString(s + 1); |
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95 PyList_Append(b, l); |
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96 Py_DECREF(l); |
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97 PyList_Append(a, x); |
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98 } |
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99 Py_DECREF(x); |
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100 } |
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101 } |
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102 return Py_BuildValue("l", 0); |
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103 } |
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104 |
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105 /* |
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106 * compare the lines in a with the lines in b. a is assumed to have |
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107 * a control char at the start of each line, this char is ignored in the |
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108 * compare |
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109 */ |
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110 static PyObject * |
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111 testhunk(PyObject *self, PyObject *args) |
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112 { |
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113 |
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114 PyObject *a, *b; |
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115 long bstart; |
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116 int alen, blen; |
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117 int i; |
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118 char *sa, *sb; |
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119 |
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120 if (!PyArg_ParseTuple(args, "OOl", &a, &b, &bstart)) |
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121 return NULL; |
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122 alen = PyList_Size(a); |
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123 blen = PyList_Size(b); |
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124 if (alen > blen - bstart) { |
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125 return Py_BuildValue("l", -1); |
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126 } |
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127 for (i = 0 ; i < alen ; i++) { |
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128 sa = PyString_AS_STRING(PyList_GET_ITEM(a, i)); |
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129 sb = PyString_AS_STRING(PyList_GET_ITEM(b, i + bstart)); |
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130 if (strcmp(sa+1, sb) != 0) |
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131 return Py_BuildValue("l", -1); |
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132 } |
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133 return Py_BuildValue("l", 0); |
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134 } |
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135 |
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136 static PyMethodDef methods[] = { |
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137 {"addlines", addlines, METH_VARARGS, "add lines to a hunk\n"}, |
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138 {"fix_newline", fix_newline, METH_VARARGS, "fixup newline counters\n"}, |
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139 {"testhunk", testhunk, METH_VARARGS, "test lines in a hunk\n"}, |
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140 {NULL, NULL} |
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141 }; |
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142 |
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143 PyMODINIT_FUNC |
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144 initdiffhelpers(void) |
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145 { |
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146 Py_InitModule3("diffhelpers", methods, diffhelpers_doc); |
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147 diffhelpers_Error = PyErr_NewException("diffhelpers.diffhelpersError", |
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148 NULL, NULL); |
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149 } |
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150 |