author | Juan Pablo Carbajal (desktop) <carbajal@ifi.uzh.ch> |
Sat, 29 Sep 2012 13:41:02 +0200 | |
changeset 17685 | 8fcef9614150 |
parent 16695 | 0a0933d3d59c |
child 23959 | c8e7fa41bfc5 |
permissions | -rw-r--r-- |
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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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#include "util.h" |
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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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Py_ssize_t hunksz = PyList_Size(hunk); |
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PyObject *s = PyList_GET_ITEM(hunk, hunksz-1); |
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char *l = PyBytes_AsString(s); |
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Py_ssize_t alen = PyList_Size(a); |
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Py_ssize_t blen = PyList_Size(b); |
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char c = l[0]; |
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PyObject *hline; |
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Py_ssize_t sz = PyBytes_GET_SIZE(s); |
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|
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if (sz > 1 && l[sz-2] == '\r') |
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/* tolerate CRLF in last line */ |
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sz -= 1; |
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hline = PyBytes_FromStringAndSize(l, sz-1); |
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if (c == ' ' || c == '+') { |
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PyObject *rline = PyBytes_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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#if (PY_VERSION_HEX < 0x02050000) |
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static const char *addlines_format = "OOiiOO"; |
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#else |
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static const char *addlines_format = "OOnnOO"; |
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#endif |
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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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Py_ssize_t i; |
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Py_ssize_t lena, lenb; |
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Py_ssize_t num; |
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Py_ssize_t todoa, todob; |
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char *s, c; |
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PyObject *l; |
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if (!PyArg_ParseTuple(args, addlines_format, |
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&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 = PyBytes_AsString(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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if (c == '\n') { |
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/* Some patches may be missing the control char |
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* on empty lines. Supply a leading space. */ |
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Py_DECREF(x); |
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x = PyBytes_FromString(" \n"); |
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} |
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PyList_Append(hunk, x); |
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108 |
if (c == '+') { |
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l = PyBytes_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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114 |
} else { |
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l = PyBytes_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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} |
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|
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/* |
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* compare the lines in a with the lines in b. a is assumed to have |
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* a control char at the start of each line, this char is ignored in the |
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* compare |
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*/ |
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static PyObject * |
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testhunk(PyObject *self, PyObject *args) |
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{ |
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PyObject *a, *b; |
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long bstart; |
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Py_ssize_t alen, blen; |
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Py_ssize_t i; |
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char *sa, *sb; |
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|
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if (!PyArg_ParseTuple(args, "OOl", &a, &b, &bstart)) |
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return NULL; |
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alen = PyList_Size(a); |
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blen = PyList_Size(b); |
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if (alen > blen - bstart || bstart < 0) { |
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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 = PyBytes_AsString(PyList_GET_ITEM(a, i)); |
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sb = PyBytes_AsString(PyList_GET_ITEM(b, i + bstart)); |
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if (strcmp(sa + 1, sb) != 0) |
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return Py_BuildValue("l", -1); |
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} |
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return Py_BuildValue("l", 0); |
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} |
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|
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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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|
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#ifdef IS_PY3K |
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static struct PyModuleDef diffhelpers_module = { |
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PyModuleDef_HEAD_INIT, |
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"diffhelpers", |
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diffhelpers_doc, |
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-1, |
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methods |
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}; |
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|
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PyMODINIT_FUNC PyInit_diffhelpers(void) |
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{ |
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PyObject *m; |
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|
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m = PyModule_Create(&diffhelpers_module); |
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if (m == NULL) |
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return NULL; |
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|
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diffhelpers_Error = PyErr_NewException("diffhelpers.diffhelpersError", |
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NULL, NULL); |
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Py_INCREF(diffhelpers_Error); |
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PyModule_AddObject(m, "diffhelpersError", diffhelpers_Error); |
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return m; |
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} |
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188 |
#else |
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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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#endif |
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197 |