mirror of https://github.com/python/cpython
Several changes. Test program to follow.
- Where optional arguments were being used, converted to
PyArg_ParseTuple() style instead of nested PyArg_Parse() style.
- Check for and handle many potential error conditions that were never
being tested.
- internal reg_* functions renamed to regobj_* (makes it easier to
figure out which are global regex functions and which are for regex
objects).
- reg_group (now regobj_group) was quite extensively reworked. it no
longer recurses to do its job (by factoring core functionality into
a separate function that knows about string and integer indexes).
- some minor formatting fixes.
- regex_set_syntax() now invalidates the cache. Without this change
(in the example below), the second search would produce different
output depending on whether the first search were performed or not
(since performing the first search would cache the compiled object
with RE_SYNTAX_EMACS, causing the second test to unexpectedly fail).
regex.search('(a+)|(b+)', 'cdb')
prev = regex.set_syntax(RE_SYNTAX_AWK)
regex.search('(a+)|(b+)', 'cdb')
This commit is contained in:
Barry Warsaw
parent
4455cd8e19
commit
c357325663
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@ -80,6 +80,7 @@ makeresult(regs)
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PyObject *v;
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int i;
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static PyObject *filler = NULL;
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if (filler == NULL) {
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filler = Py_BuildValue("(ii)", -1, -1);
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if (filler == NULL)
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@ -88,6 +89,7 @@ makeresult(regs)
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v = PyTuple_New(RE_NREGS);
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if (v == NULL)
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return NULL;
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for (i = 0; i < RE_NREGS; i++) {
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int lo = regs->start[i];
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int hi = regs->end[i];
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@ -98,35 +100,27 @@ makeresult(regs)
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}
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else
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w = Py_BuildValue("(ii)", lo, hi);
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if (w == NULL) {
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Py_XDECREF(v);
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if (w == NULL || PyTuple_SetItem(v, i, w) < 0) {
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Py_DECREF(v);
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return NULL;
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}
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PyTuple_SetItem(v, i, w);
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}
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return v;
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}
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static PyObject *
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reg_match(re, args)
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regobj_match(re, args)
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regexobject *re;
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PyObject *args;
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{
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PyObject *argstring;
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char *buffer;
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int size;
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int offset;
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int offset = 0;
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int result;
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if (PyArg_Parse(args, "S", &argstring)) {
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offset = 0;
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}
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else {
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PyErr_Clear();
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if (!PyArg_Parse(args, "(Si)", &argstring, &offset))
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return NULL;
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}
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buffer = PyString_AsString(argstring);
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size = PyString_Size(argstring);
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if (!PyArg_ParseTuple(args, "s#|i", &buffer, &size, &offset))
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return NULL;
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if (offset < 0 || offset > size) {
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PyErr_SetString(RegexError, "match offset out of range");
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return NULL;
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@ -140,34 +134,28 @@ reg_match(re, args)
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return NULL;
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}
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if (result >= 0) {
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Py_INCREF(argstring);
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re->re_lastok = argstring;
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PyObject* str = PyString_FromStringAndSize(buffer, size);
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if (!str)
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return NULL;
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re->re_lastok = str;
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}
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return PyInt_FromLong((long)result); /* Length of the match or -1 */
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}
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static PyObject *
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reg_search(re, args)
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regobj_search(re, args)
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regexobject *re;
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PyObject *args;
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{
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PyObject *argstring;
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char *buffer;
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int size;
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int offset;
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int offset = 0;
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int range;
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int result;
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if (PyArg_Parse(args, "S", &argstring)) {
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offset = 0;
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}
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else {
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PyErr_Clear();
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if (!PyArg_Parse(args, "(Si)", &argstring, &offset))
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return NULL;
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}
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buffer = PyString_AsString(argstring);
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size = PyString_Size(argstring);
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if (!PyArg_ParseTuple(args, "s#|i", &buffer, &size, &offset))
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return NULL;
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if (offset < 0 || offset > size) {
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PyErr_SetString(RegexError, "search offset out of range");
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return NULL;
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@ -187,58 +175,45 @@ reg_search(re, args)
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return NULL;
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}
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if (result >= 0) {
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Py_INCREF(argstring);
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re->re_lastok = argstring;
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PyObject* str = PyString_FromStringAndSize(buffer, size);
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if (!str)
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return NULL;
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re->re_lastok = str;
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}
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return PyInt_FromLong((long)result); /* Position of the match or -1 */
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}
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static PyObject *
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reg_group(re, args)
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/* get the group from the regex where index can be a string (group name) or
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an integer index [0 .. 99]
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*/
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static PyObject*
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group_from_index(re, index)
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regexobject *re;
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PyObject *args;
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PyObject *index;
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{
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int i, a, b;
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if (args != NULL && PyTuple_Check(args)) {
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int n = PyTuple_Size(args);
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PyObject *res = PyTuple_New(n);
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if (res == NULL)
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char *v;
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if (PyString_Check(index))
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if (re->re_groupindex == NULL ||
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!(index = PyDict_GetItem(re->re_groupindex, index)))
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{
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PyErr_SetString(RegexError,
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"group() group name doesn't exist");
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return NULL;
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for (i = 0; i < n; i++) {
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PyObject *v = reg_group(re, PyTuple_GetItem(args, i));
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if (v == NULL) {
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Py_DECREF(res);
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return NULL;
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}
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PyTuple_SetItem(res, i, v);
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}
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return res;
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}
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if (!PyArg_Parse(args, "i", &i)) {
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PyObject *n;
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PyErr_Clear();
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if (!PyArg_Parse(args, "S", &n))
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return NULL;
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else {
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PyObject *index;
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if (re->re_groupindex == NULL)
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index = NULL;
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else
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index = PyDict_GetItem(re->re_groupindex, n);
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if (index == NULL) {
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PyErr_SetString(RegexError, "group() group name doesn't exist");
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return NULL;
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}
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i = PyInt_AsLong(index);
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}
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}
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i = PyInt_AsLong(index);
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if (i == -1 && PyErr_Occurred())
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return NULL;
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if (i < 0 || i >= RE_NREGS) {
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PyErr_SetString(RegexError, "group() index out of range");
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return NULL;
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}
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if (re->re_lastok == NULL) {
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PyErr_SetString(RegexError,
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"group() only valid after successful match/search");
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"group() only valid after successful match/search");
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return NULL;
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}
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a = re->re_regs.start[i];
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@ -247,18 +222,79 @@ reg_group(re, args)
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Py_INCREF(Py_None);
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return Py_None;
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}
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return PyString_FromStringAndSize(PyString_AsString(re->re_lastok)+a, b-a);
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if (!(v = PyString_AsString(re->re_lastok)))
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return NULL;
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return PyString_FromStringAndSize(v+a, b-a);
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}
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static PyObject *
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regobj_group(re, args)
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regexobject *re;
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PyObject *args;
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{
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int n = PyTuple_Size(args);
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int i;
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PyObject *res = NULL;
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if (n < 0)
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return NULL;
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if (n == 0) {
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PyErr_SetString(PyExc_TypeError, "not enough arguments");
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return NULL;
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}
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if (n == 1) {
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/* return value is a single string */
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PyObject *index = PyTuple_GetItem(args, 0);
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if (!index)
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return NULL;
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return group_from_index(re, index);
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}
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/* return value is a tuple */
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if (!(res = PyTuple_New(n)))
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return NULL;
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for (i = 0; i < n; i++) {
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PyObject *index = PyTuple_GetItem(args, i);
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PyObject *group = NULL;
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if (!index)
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goto finally;
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if (!(group = group_from_index(re, index)))
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goto finally;
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if (PyTuple_SetItem(res, i, group) < 0)
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goto finally;
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}
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return res;
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finally:
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Py_DECREF(res);
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return NULL;
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}
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static struct PyMethodDef reg_methods[] = {
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{"match", (PyCFunction)reg_match},
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{"search", (PyCFunction)reg_search},
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{"group", (PyCFunction)reg_group},
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{"match", (PyCFunction)regobj_match, 1},
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{"search", (PyCFunction)regobj_search, 1},
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{"group", (PyCFunction)regobj_group, 1},
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{NULL, NULL} /* sentinel */
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};
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static char* members[] = {
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"last", "regs", "translate",
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"groupindex", "realpat", "givenpat",
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NULL
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};
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static PyObject *
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reg_getattr(re, name)
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regobj_getattr(re, name)
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regexobject *re;
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char *name;
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{
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@ -310,18 +346,25 @@ reg_getattr(re, name)
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return re->re_givenpat;
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}
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if (strcmp(name, "__members__") == 0) {
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PyObject *list = PyList_New(6);
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if (list) {
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PyList_SetItem(list, 0, PyString_FromString("last"));
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PyList_SetItem(list, 1, PyString_FromString("regs"));
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PyList_SetItem(list, 2, PyString_FromString("translate"));
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PyList_SetItem(list, 3, PyString_FromString("groupindex"));
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PyList_SetItem(list, 4, PyString_FromString("realpat"));
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PyList_SetItem(list, 5, PyString_FromString("givenpat"));
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if (PyErr_Occurred()) {
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int i = 0;
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PyObject *list = NULL;
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/* okay, so it's unlikely this list will change that often.
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still, it's easier to change it in just one place.
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*/
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while (members[i])
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i++;
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if (!(list = PyList_New(i)))
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return NULL;
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i = 0;
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while (members[i]) {
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PyObject* v = PyString_FromString(members[i]);
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if (!v || PyList_SetItem(list, i, v) < 0) {
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Py_DECREF(list);
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list = NULL;
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return NULL;
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}
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i++;
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}
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return list;
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}
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@ -330,19 +373,25 @@ reg_getattr(re, name)
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static PyTypeObject Regextype = {
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PyObject_HEAD_INIT(&PyType_Type)
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0, /*ob_size*/
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"regex", /*tp_name*/
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sizeof(regexobject), /*tp_size*/
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0, /*tp_itemsize*/
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0, /*ob_size*/
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"regex", /*tp_name*/
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sizeof(regexobject), /*tp_size*/
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0, /*tp_itemsize*/
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/* methods */
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(destructor)reg_dealloc, /*tp_dealloc*/
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0, /*tp_print*/
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(getattrfunc)reg_getattr, /*tp_getattr*/
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0, /*tp_setattr*/
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0, /*tp_compare*/
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0, /*tp_repr*/
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(destructor)reg_dealloc, /*tp_dealloc*/
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0, /*tp_print*/
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(getattrfunc)regobj_getattr, /*tp_getattr*/
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0, /*tp_setattr*/
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0, /*tp_compare*/
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0, /*tp_repr*/
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};
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/* reference counting invariants:
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pattern: borrowed
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translate: borrowed
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givenpat: borrowed
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groupindex: transferred
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*/
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static PyObject *
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newregexobject(pattern, translate, givenpat, groupindex)
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PyObject *pattern;
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|
@ -351,12 +400,15 @@ newregexobject(pattern, translate, givenpat, groupindex)
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PyObject *groupindex;
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{
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regexobject *re;
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char *pat = PyString_AsString(pattern);
|
||||
int size = PyString_Size(pattern);
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char *pat;
|
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int size;
|
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|
||||
if (!PyArg_Parse(pattern, "s#", &pat, &size))
|
||||
return NULL;
|
||||
|
||||
if (translate != NULL && PyString_Size(translate) != 256) {
|
||||
PyErr_SetString(RegexError,
|
||||
"translation table must be 256 bytes");
|
||||
"translation table must be 256 bytes");
|
||||
return NULL;
|
||||
}
|
||||
re = PyObject_NEW(regexobject, &Regextype);
|
||||
|
|
@ -365,11 +417,14 @@ newregexobject(pattern, translate, givenpat, groupindex)
|
|||
re->re_patbuf.buffer = NULL;
|
||||
re->re_patbuf.allocated = 0;
|
||||
re->re_patbuf.fastmap = re->re_fastmap;
|
||||
if (translate)
|
||||
if (translate) {
|
||||
re->re_patbuf.translate = PyString_AsString(translate);
|
||||
if (!re->re_patbuf.translate)
|
||||
goto finally;
|
||||
Py_INCREF(translate);
|
||||
}
|
||||
else
|
||||
re->re_patbuf.translate = NULL;
|
||||
Py_XINCREF(translate);
|
||||
re->re_translate = translate;
|
||||
re->re_lastok = NULL;
|
||||
re->re_groupindex = groupindex;
|
||||
|
|
@ -380,11 +435,13 @@ newregexobject(pattern, translate, givenpat, groupindex)
|
|||
error = re_compile_pattern(pat, size, &re->re_patbuf);
|
||||
if (error != NULL) {
|
||||
PyErr_SetString(RegexError, error);
|
||||
Py_DECREF(re);
|
||||
re = NULL;
|
||||
goto finally;
|
||||
}
|
||||
}
|
||||
return (PyObject *)re;
|
||||
finally:
|
||||
Py_DECREF(re);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
static PyObject *
|
||||
|
|
@ -394,11 +451,9 @@ regex_compile(self, args)
|
|||
{
|
||||
PyObject *pat = NULL;
|
||||
PyObject *tran = NULL;
|
||||
if (!PyArg_Parse(args, "S", &pat)) {
|
||||
PyErr_Clear();
|
||||
if (!PyArg_Parse(args, "(SS)", &pat, &tran))
|
||||
return NULL;
|
||||
}
|
||||
|
||||
if (!PyArg_ParseTuple(args, "S|S", &pat, &tran))
|
||||
return NULL;
|
||||
return newregexobject(pat, tran, pat, NULL);
|
||||
}
|
||||
|
||||
|
|
@ -407,26 +462,31 @@ symcomp(pattern, gdict)
|
|||
PyObject *pattern;
|
||||
PyObject *gdict;
|
||||
{
|
||||
char *opat = PyString_AsString(pattern);
|
||||
char *oend = opat + PyString_Size(pattern);
|
||||
char *opat, *oend, *o, *n, *g, *v;
|
||||
int group_count = 0;
|
||||
int sz;
|
||||
int escaped = 0;
|
||||
char *o = opat;
|
||||
char *n;
|
||||
char name_buf[128];
|
||||
char *g;
|
||||
PyObject *npattern;
|
||||
int require_escape = re_syntax & RE_NO_BK_PARENS ? 0 : 1;
|
||||
|
||||
if (!(opat = PyString_AsString(pattern)))
|
||||
return NULL;
|
||||
|
||||
if ((sz = PyString_Size(pattern)) < 0)
|
||||
return NULL;
|
||||
|
||||
oend = opat + sz;
|
||||
o = opat;
|
||||
|
||||
if (oend == opat) {
|
||||
Py_INCREF(pattern);
|
||||
return pattern;
|
||||
}
|
||||
|
||||
npattern = PyString_FromStringAndSize((char*)NULL, PyString_Size(pattern));
|
||||
if (npattern == NULL)
|
||||
if (!(npattern = PyString_FromStringAndSize((char*)NULL, sz)) ||
|
||||
!(n = PyString_AsString(npattern)))
|
||||
return NULL;
|
||||
n = PyString_AsString(npattern);
|
||||
|
||||
while (o < oend) {
|
||||
if (*o == '(' && escaped == require_escape) {
|
||||
|
|
@ -443,20 +503,23 @@ symcomp(pattern, gdict)
|
|||
g = name_buf;
|
||||
for (++o; o < oend;) {
|
||||
if (*o == '>') {
|
||||
PyObject *group_name = NULL;
|
||||
PyObject *group_index = NULL;
|
||||
*g++ = '\0';
|
||||
group_name = PyString_FromString(name_buf);
|
||||
group_index = PyInt_FromLong(group_count);
|
||||
if (group_name == NULL || group_index == NULL
|
||||
|| PyDict_SetItem(gdict, group_name, group_index) != 0) {
|
||||
Py_XDECREF(group_name);
|
||||
Py_XDECREF(group_index);
|
||||
Py_XDECREF(npattern);
|
||||
return NULL;
|
||||
}
|
||||
++o; /* eat the '>' */
|
||||
break;
|
||||
PyObject *group_name = NULL;
|
||||
PyObject *group_index = NULL;
|
||||
*g++ = '\0';
|
||||
group_name = PyString_FromString(name_buf);
|
||||
group_index = PyInt_FromLong(group_count);
|
||||
if (group_name == NULL ||
|
||||
group_index == NULL ||
|
||||
PyDict_SetItem(gdict, group_name,
|
||||
group_index) != 0)
|
||||
{
|
||||
Py_XDECREF(group_name);
|
||||
Py_XDECREF(group_index);
|
||||
Py_XDECREF(npattern);
|
||||
return NULL;
|
||||
}
|
||||
++o; /* eat the '>' */
|
||||
break;
|
||||
}
|
||||
if (!isalnum(Py_CHARMASK(*o)) && *o != '_') {
|
||||
o = backtrack;
|
||||
|
|
@ -467,7 +530,7 @@ symcomp(pattern, gdict)
|
|||
}
|
||||
else if (*o == '[' && !escaped) {
|
||||
*n++ = *o;
|
||||
++o; /* eat the char following '[' */
|
||||
++o; /* eat the char following '[' */
|
||||
*n++ = *o;
|
||||
while (o < oend && *o != ']') {
|
||||
++o;
|
||||
|
|
@ -488,7 +551,12 @@ symcomp(pattern, gdict)
|
|||
}
|
||||
}
|
||||
|
||||
if (_PyString_Resize(&npattern, n - PyString_AsString(npattern)) == 0)
|
||||
if (!(v = PyString_AsString(npattern))) {
|
||||
Py_DECREF(npattern);
|
||||
return NULL;
|
||||
}
|
||||
/* _PyString_Resize() decrements npattern on failure */
|
||||
if (_PyString_Resize(&npattern, n - v) == 0)
|
||||
return npattern;
|
||||
else {
|
||||
return NULL;
|
||||
|
|
@ -505,14 +573,12 @@ regex_symcomp(self, args)
|
|||
PyObject *tran = NULL;
|
||||
PyObject *gdict = NULL;
|
||||
PyObject *npattern;
|
||||
if (!PyArg_Parse(args, "S", &pattern)) {
|
||||
PyErr_Clear();
|
||||
if (!PyArg_Parse(args, "(SS)", &pattern, &tran))
|
||||
return NULL;
|
||||
}
|
||||
|
||||
if (!PyArg_ParseTuple(args, "S|S", &pattern, &tran))
|
||||
return NULL;
|
||||
|
||||
gdict = PyDict_New();
|
||||
if (gdict == NULL
|
||||
|| (npattern = symcomp(pattern, gdict)) == NULL) {
|
||||
if (gdict == NULL || (npattern = symcomp(pattern, gdict)) == NULL) {
|
||||
Py_DECREF(gdict);
|
||||
Py_DECREF(pattern);
|
||||
return NULL;
|
||||
|
|
@ -528,17 +594,27 @@ static int
|
|||
update_cache(pat)
|
||||
PyObject *pat;
|
||||
{
|
||||
PyObject *tuple = Py_BuildValue("(O)", pat);
|
||||
int status = 0;
|
||||
|
||||
if (!tuple)
|
||||
return -1;
|
||||
|
||||
if (pat != cache_pat) {
|
||||
Py_XDECREF(cache_pat);
|
||||
cache_pat = NULL;
|
||||
Py_XDECREF(cache_prog);
|
||||
cache_prog = regex_compile((PyObject *)NULL, pat);
|
||||
if (cache_prog == NULL)
|
||||
return -1;
|
||||
cache_prog = regex_compile((PyObject *)NULL, tuple);
|
||||
if (cache_prog == NULL) {
|
||||
status = -1;
|
||||
goto finally;
|
||||
}
|
||||
cache_pat = pat;
|
||||
Py_INCREF(cache_pat);
|
||||
}
|
||||
return 0;
|
||||
finally:
|
||||
Py_DECREF(tuple);
|
||||
return status;
|
||||
}
|
||||
|
||||
static PyObject *
|
||||
|
|
@ -547,11 +623,18 @@ regex_match(self, args)
|
|||
PyObject *args;
|
||||
{
|
||||
PyObject *pat, *string;
|
||||
PyObject *tuple, *v;
|
||||
|
||||
if (!PyArg_Parse(args, "(SS)", &pat, &string))
|
||||
return NULL;
|
||||
if (update_cache(pat) < 0)
|
||||
return NULL;
|
||||
return reg_match((regexobject *)cache_prog, string);
|
||||
|
||||
if (!(tuple = Py_BuildValue("(S)", string)))
|
||||
return NULL;
|
||||
v = regobj_match((regexobject *)cache_prog, tuple);
|
||||
Py_DECREF(tuple);
|
||||
return v;
|
||||
}
|
||||
|
||||
static PyObject *
|
||||
|
|
@ -560,58 +643,80 @@ regex_search(self, args)
|
|||
PyObject *args;
|
||||
{
|
||||
PyObject *pat, *string;
|
||||
PyObject *tuple, *v;
|
||||
|
||||
if (!PyArg_Parse(args, "(SS)", &pat, &string))
|
||||
return NULL;
|
||||
if (update_cache(pat) < 0)
|
||||
return NULL;
|
||||
return reg_search((regexobject *)cache_prog, string);
|
||||
|
||||
if (!(tuple = Py_BuildValue("(S)", string)))
|
||||
return NULL;
|
||||
v = regobj_search((regexobject *)cache_prog, tuple);
|
||||
Py_DECREF(tuple);
|
||||
return v;
|
||||
}
|
||||
|
||||
static PyObject *
|
||||
regex_set_syntax(self, args)
|
||||
PyObject *self, *args;
|
||||
PyObject *self;
|
||||
PyObject *args;
|
||||
{
|
||||
int syntax;
|
||||
if (!PyArg_Parse(args, "i", &syntax))
|
||||
return NULL;
|
||||
syntax = re_set_syntax(syntax);
|
||||
/* wipe the global pattern cache */
|
||||
Py_XDECREF(cache_pat);
|
||||
cache_pat = NULL;
|
||||
Py_XDECREF(cache_prog);
|
||||
cache_prog = NULL;
|
||||
return PyInt_FromLong((long)syntax);
|
||||
}
|
||||
|
||||
static struct PyMethodDef regex_global_methods[] = {
|
||||
{"compile", regex_compile, 0},
|
||||
{"symcomp", regex_symcomp, 0},
|
||||
{"compile", regex_compile, 1},
|
||||
{"symcomp", regex_symcomp, 1},
|
||||
{"match", regex_match, 0},
|
||||
{"search", regex_search, 0},
|
||||
{"set_syntax", regex_set_syntax, 0},
|
||||
{NULL, NULL} /* sentinel */
|
||||
{NULL, NULL} /* sentinel */
|
||||
};
|
||||
|
||||
void
|
||||
initregex()
|
||||
{
|
||||
PyObject *m, *d, *v;
|
||||
int i;
|
||||
char *s;
|
||||
|
||||
m = Py_InitModule("regex", regex_global_methods);
|
||||
d = PyModule_GetDict(m);
|
||||
|
||||
/* Initialize regex.error exception */
|
||||
RegexError = PyString_FromString("regex.error");
|
||||
if (RegexError == NULL || PyDict_SetItemString(d, "error", RegexError) != 0)
|
||||
Py_FatalError("can't define regex.error");
|
||||
|
||||
v = RegexError = PyString_FromString("regex.error");
|
||||
if (v == NULL || PyDict_SetItemString(d, "error", v) != 0)
|
||||
goto finally;
|
||||
|
||||
/* Initialize regex.casefold constant */
|
||||
v = PyString_FromStringAndSize((char *)NULL, 256);
|
||||
if (v != NULL) {
|
||||
int i;
|
||||
char *s = PyString_AsString(v);
|
||||
for (i = 0; i < 256; i++) {
|
||||
if (isupper(i))
|
||||
s[i] = tolower(i);
|
||||
else
|
||||
s[i] = i;
|
||||
}
|
||||
PyDict_SetItemString(d, "casefold", v);
|
||||
Py_DECREF(v);
|
||||
if (!(v = PyString_FromStringAndSize((char *)NULL, 256)))
|
||||
goto finally;
|
||||
|
||||
if (!(s = PyString_AsString(v)))
|
||||
goto finally;
|
||||
|
||||
for (i = 0; i < 256; i++) {
|
||||
if (isupper(i))
|
||||
s[i] = tolower(i);
|
||||
else
|
||||
s[i] = i;
|
||||
}
|
||||
if (PyDict_SetItemString(d, "casefold", v) < 0)
|
||||
goto finally;
|
||||
Py_DECREF(v);
|
||||
|
||||
if (!PyErr_Occurred())
|
||||
return;
|
||||
finally:
|
||||
Py_FatalError("can't initialize regex module");
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue