Skip to content
Snippets Groups Projects
Commit 4574925d authored by Bryan O'Sullivan's avatar Bryan O'Sullivan
Browse files

Add Chris Mason's mpatch library.

parent ee04732f
No related branches found
No related tags found
No related merge requests found
/*
* diffhelpers.c - helper routines for mpatch
*
* Copyright 2007 Chris Mason <chris.mason@oracle.com>
*
* This software may be used and distributed according to the terms
* of the GNU General Public License v2, incorporated herein by reference.
*/
#include <Python.h>
#include <stdlib.h>
#include <string.h>
static char diffhelpers_doc[] = "Efficient diff parsing";
static PyObject *diffhelpers_Error;
/* fixup the last lines of a and b when the patch has no newline at eof */
static void _fix_newline(PyObject *hunk, PyObject *a, PyObject *b)
{
int hunksz = PyList_Size(hunk);
PyObject *s = PyList_GET_ITEM(hunk, hunksz-1);
char *l = PyString_AS_STRING(s);
int sz = PyString_GET_SIZE(s);
int alen = PyList_Size(a);
int blen = PyList_Size(b);
char c = l[0];
PyObject *hline = PyString_FromStringAndSize(l, sz-1);
if (c == ' ' || c == '+') {
PyObject *rline = PyString_FromStringAndSize(l+1, sz-2);
PyList_SetItem(b, blen-1, rline);
}
if (c == ' ' || c == '-') {
Py_INCREF(hline);
PyList_SetItem(a, alen-1, hline);
}
PyList_SetItem(hunk, hunksz-1, hline);
}
/* python callable form of _fix_newline */
static PyObject *
fix_newline(PyObject *self, PyObject *args)
{
PyObject *hunk, *a, *b;
if (!PyArg_ParseTuple(args, "OOO", &hunk, &a, &b))
return NULL;
_fix_newline(hunk, a, b);
return Py_BuildValue("l", 0);
}
/*
* read lines from fp into the hunk. The hunk is parsed into two arrays
* a and b. a gets the old state of the text, b gets the new state
* The control char from the hunk is saved when inserting into a, but not b
* (for performance while deleting files)
*/
static PyObject *
addlines(PyObject *self, PyObject *args)
{
PyObject *fp, *hunk, *a, *b, *x;
int i;
int lena, lenb;
int num;
int todoa, todob;
char *s, c;
PyObject *l;
if (!PyArg_ParseTuple(args, "OOiiOO", &fp, &hunk, &lena, &lenb, &a, &b))
return NULL;
while(1) {
todoa = lena - PyList_Size(a);
todob = lenb - PyList_Size(b);
num = todoa > todob ? todoa : todob;
if (num == 0)
break;
for (i = 0 ; i < num ; i++) {
x = PyFile_GetLine(fp, 0);
s = PyString_AS_STRING(x);
c = *s;
if (strcmp(s, "\\ No newline at end of file\n") == 0) {
_fix_newline(hunk, a, b);
continue;
}
PyList_Append(hunk, x);
if (c == '+') {
l = PyString_FromString(s + 1);
PyList_Append(b, l);
Py_DECREF(l);
} else if (c == '-') {
PyList_Append(a, x);
} else {
l = PyString_FromString(s + 1);
PyList_Append(b, l);
Py_DECREF(l);
PyList_Append(a, x);
}
Py_DECREF(x);
}
}
return Py_BuildValue("l", 0);
}
/*
* compare the lines in a with the lines in b. a is assumed to have
* a control char at the start of each line, this char is ignored in the
* compare
*/
static PyObject *
testhunk(PyObject *self, PyObject *args)
{
PyObject *a, *b;
long bstart;
int alen, blen;
int i;
char *sa, *sb;
if (!PyArg_ParseTuple(args, "OOl", &a, &b, &bstart))
return NULL;
alen = PyList_Size(a);
blen = PyList_Size(b);
if (alen > blen - bstart) {
return Py_BuildValue("l", -1);
}
for (i = 0 ; i < alen ; i++) {
sa = PyString_AS_STRING(PyList_GET_ITEM(a, i));
sb = PyString_AS_STRING(PyList_GET_ITEM(b, i + bstart));
if (strcmp(sa+1, sb) != 0)
return Py_BuildValue("l", -1);
}
return Py_BuildValue("l", 0);
}
static PyMethodDef methods[] = {
{"addlines", addlines, METH_VARARGS, "add lines to a hunk\n"},
{"fix_newline", fix_newline, METH_VARARGS, "fixup newline counters\n"},
{"testhunk", testhunk, METH_VARARGS, "test lines in a hunk\n"},
{NULL, NULL}
};
PyMODINIT_FUNC
initdiffhelpers(void)
{
Py_InitModule3("diffhelpers", methods, diffhelpers_doc);
diffhelpers_Error = PyErr_NewException("diffhelpers.diffhelpersError",
NULL, NULL);
}
This diff is collapsed.
......@@ -64,7 +64,8 @@
packages=['mercurial', 'mercurial.hgweb', 'hgext', 'hgext.convert'],
ext_modules=[Extension('mercurial.mpatch', ['mercurial/mpatch.c']),
Extension('mercurial.bdiff', ['mercurial/bdiff.c']),
Extension('mercurial.base85', ['mercurial/base85.c'])],
Extension('mercurial.base85', ['mercurial/base85.c']),
Extension('mercurial.diffhelpers', ['mercurial/diffhelpers.c'])],
data_files=[(os.path.join('mercurial', root),
[os.path.join(root, file_) for file_ in files])
for root, dirs, files in os.walk('templates')],
......
0% Loading or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment