author | Thomas Arendsen Hein <thomas@intevation.de> |
Mon, 06 Aug 2007 20:31:15 +0200 | |
changeset 5098 | 90be02035993 |
parent 4897 | 4574925db5c0 |
permissions | -rw-r--r-- |
4897
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/* |
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* diffhelpers.c - helper routines for mpatch |
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* |
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* Copyright 2007 Chris Mason <chris.mason@oracle.com> |
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* |
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* This software may be used and distributed according to the terms |
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* of the GNU General Public License v2, incorporated herein by reference. |
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*/ |
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|
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#include <Python.h> |
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#include <stdlib.h> |
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#include <string.h> |
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|
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static char diffhelpers_doc[] = "Efficient diff parsing"; |
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static PyObject *diffhelpers_Error; |
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|
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|
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/* fixup the last lines of a and b when the patch has no newline at eof */ |
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static void _fix_newline(PyObject *hunk, PyObject *a, PyObject *b) |
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{ |
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int hunksz = PyList_Size(hunk); |
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PyObject *s = PyList_GET_ITEM(hunk, hunksz-1); |
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char *l = PyString_AS_STRING(s); |
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int sz = PyString_GET_SIZE(s); |
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int alen = PyList_Size(a); |
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int blen = PyList_Size(b); |
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char c = l[0]; |
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|
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PyObject *hline = PyString_FromStringAndSize(l, sz-1); |
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if (c == ' ' || c == '+') { |
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PyObject *rline = PyString_FromStringAndSize(l+1, sz-2); |
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PyList_SetItem(b, blen-1, rline); |
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} |
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if (c == ' ' || c == '-') { |
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Py_INCREF(hline); |
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PyList_SetItem(a, alen-1, hline); |
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} |
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PyList_SetItem(hunk, hunksz-1, hline); |
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} |
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|
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/* python callable form of _fix_newline */ |
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static PyObject * |
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fix_newline(PyObject *self, PyObject *args) |
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{ |
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PyObject *hunk, *a, *b; |
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if (!PyArg_ParseTuple(args, "OOO", &hunk, &a, &b)) |
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return NULL; |
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_fix_newline(hunk, a, b); |
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return Py_BuildValue("l", 0); |
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} |
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|
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/* |
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* read lines from fp into the hunk. The hunk is parsed into two arrays |
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* a and b. a gets the old state of the text, b gets the new state |
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* The control char from the hunk is saved when inserting into a, but not b |
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* (for performance while deleting files) |
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*/ |
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static PyObject * |
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addlines(PyObject *self, PyObject *args) |
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{ |
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|
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PyObject *fp, *hunk, *a, *b, *x; |
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int i; |
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int lena, lenb; |
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int num; |
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int todoa, todob; |
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char *s, c; |
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PyObject *l; |
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if (!PyArg_ParseTuple(args, "OOiiOO", &fp, &hunk, &lena, &lenb, &a, &b)) |
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return NULL; |
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|
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while(1) { |
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todoa = lena - PyList_Size(a); |
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todob = lenb - PyList_Size(b); |
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num = todoa > todob ? todoa : todob; |
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if (num == 0) |
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break; |
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for (i = 0 ; i < num ; i++) { |
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x = PyFile_GetLine(fp, 0); |
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s = PyString_AS_STRING(x); |
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c = *s; |
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if (strcmp(s, "\\ No newline at end of file\n") == 0) { |
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_fix_newline(hunk, a, b); |
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continue; |
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} |
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PyList_Append(hunk, x); |
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if (c == '+') { |
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l = PyString_FromString(s + 1); |
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PyList_Append(b, l); |
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Py_DECREF(l); |
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} else if (c == '-') { |
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PyList_Append(a, x); |
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} else { |
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l = PyString_FromString(s + 1); |
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PyList_Append(b, l); |
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Py_DECREF(l); |
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PyList_Append(a, x); |
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} |
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Py_DECREF(x); |
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} |
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} |
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return Py_BuildValue("l", 0); |
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103 |
} |
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104 |
|
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/* |
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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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*/ |
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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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return Py_BuildValue("l", -1); |
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} |
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for (i = 0 ; i < alen ; i++) { |
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sa = PyString_AS_STRING(PyList_GET_ITEM(a, i)); |
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sb = PyString_AS_STRING(PyList_GET_ITEM(b, i + bstart)); |
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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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return Py_BuildValue("l", 0); |
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134 |
} |
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135 |
|
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static PyMethodDef methods[] = { |
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{"addlines", addlines, METH_VARARGS, "add lines to a hunk\n"}, |
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{"fix_newline", fix_newline, METH_VARARGS, "fixup newline counters\n"}, |
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{"testhunk", testhunk, METH_VARARGS, "test lines in a hunk\n"}, |
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{NULL, NULL} |
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}; |
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142 |
|
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143 |
PyMODINIT_FUNC |
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initdiffhelpers(void) |
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{ |
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Py_InitModule3("diffhelpers", methods, diffhelpers_doc); |
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diffhelpers_Error = PyErr_NewException("diffhelpers.diffhelpersError", |
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NULL, NULL); |
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} |
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150 |