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transmogrify.h
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264 lines (222 loc) · 6.9 KB
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/* NOTE: this API is -ONLY- for use with single byte character strings. */
/* Do not use it with Unicode. */
/* the more complicated methods. parts of these should be pulled out into the
shared code in bytes_methods.c to cut down on duplicate code bloat. */
PyDoc_STRVAR(expandtabs__doc__,
"B.expandtabs([tabsize]) -> copy of B\n\
\n\
Return a copy of B where all tab characters are expanded using spaces.\n\
If tabsize is not given, a tab size of 8 characters is assumed.");
static PyObject*
stringlib_expandtabs(PyObject *self, PyObject *args)
{
const char *e, *p;
char *q;
Py_ssize_t i, j;
PyObject *u;
int tabsize = 8;
if (!PyArg_ParseTuple(args, "|i:expandtabs", &tabsize))
return NULL;
/* First pass: determine size of output string */
i = j = 0;
e = STRINGLIB_STR(self) + STRINGLIB_LEN(self);
for (p = STRINGLIB_STR(self); p < e; p++) {
if (*p == '\t') {
if (tabsize > 0) {
Py_ssize_t incr = tabsize - (j % tabsize);
if (j > PY_SSIZE_T_MAX - incr)
goto overflow;
j += incr;
}
}
else {
if (j > PY_SSIZE_T_MAX - 1)
goto overflow;
j++;
if (*p == '\n' || *p == '\r') {
if (i > PY_SSIZE_T_MAX - j)
goto overflow;
i += j;
j = 0;
}
}
}
if (i > PY_SSIZE_T_MAX - j)
goto overflow;
/* Second pass: create output string and fill it */
u = STRINGLIB_NEW(NULL, i + j);
if (!u)
return NULL;
j = 0;
q = STRINGLIB_STR(u);
for (p = STRINGLIB_STR(self); p < e; p++) {
if (*p == '\t') {
if (tabsize > 0) {
i = tabsize - (j % tabsize);
j += i;
while (i--)
*q++ = ' ';
}
}
else {
j++;
*q++ = *p;
if (*p == '\n' || *p == '\r')
j = 0;
}
}
return u;
overflow:
PyErr_SetString(PyExc_OverflowError, "result too long");
return NULL;
}
Py_LOCAL_INLINE(PyObject *)
pad(PyObject *self, Py_ssize_t left, Py_ssize_t right, char fill)
{
PyObject *u;
if (left < 0)
left = 0;
if (right < 0)
right = 0;
if (left == 0 && right == 0 && STRINGLIB_CHECK_EXACT(self)) {
#if STRINGLIB_MUTABLE
/* We're defined as returning a copy; If the object is mutable
* that means we must make an identical copy. */
return STRINGLIB_NEW(STRINGLIB_STR(self), STRINGLIB_LEN(self));
#else
Py_INCREF(self);
return (PyObject *)self;
#endif /* STRINGLIB_MUTABLE */
}
u = STRINGLIB_NEW(NULL,
left + STRINGLIB_LEN(self) + right);
if (u) {
if (left)
memset(STRINGLIB_STR(u), fill, left);
Py_MEMCPY(STRINGLIB_STR(u) + left,
STRINGLIB_STR(self),
STRINGLIB_LEN(self));
if (right)
memset(STRINGLIB_STR(u) + left + STRINGLIB_LEN(self),
fill, right);
}
return u;
}
PyDoc_STRVAR(ljust__doc__,
"B.ljust(width[, fillchar]) -> copy of B\n"
"\n"
"Return B left justified in a string of length width. Padding is\n"
"done using the specified fill character (default is a space).");
static PyObject *
stringlib_ljust(PyObject *self, PyObject *args)
{
Py_ssize_t width;
char fillchar = ' ';
if (!PyArg_ParseTuple(args, "n|c:ljust", &width, &fillchar))
return NULL;
if (STRINGLIB_LEN(self) >= width && STRINGLIB_CHECK_EXACT(self)) {
#if STRINGLIB_MUTABLE
/* We're defined as returning a copy; If the object is mutable
* that means we must make an identical copy. */
return STRINGLIB_NEW(STRINGLIB_STR(self), STRINGLIB_LEN(self));
#else
Py_INCREF(self);
return (PyObject*) self;
#endif
}
return pad(self, 0, width - STRINGLIB_LEN(self), fillchar);
}
PyDoc_STRVAR(rjust__doc__,
"B.rjust(width[, fillchar]) -> copy of B\n"
"\n"
"Return B right justified in a string of length width. Padding is\n"
"done using the specified fill character (default is a space)");
static PyObject *
stringlib_rjust(PyObject *self, PyObject *args)
{
Py_ssize_t width;
char fillchar = ' ';
if (!PyArg_ParseTuple(args, "n|c:rjust", &width, &fillchar))
return NULL;
if (STRINGLIB_LEN(self) >= width && STRINGLIB_CHECK_EXACT(self)) {
#if STRINGLIB_MUTABLE
/* We're defined as returning a copy; If the object is mutable
* that means we must make an identical copy. */
return STRINGLIB_NEW(STRINGLIB_STR(self), STRINGLIB_LEN(self));
#else
Py_INCREF(self);
return (PyObject*) self;
#endif
}
return pad(self, width - STRINGLIB_LEN(self), 0, fillchar);
}
PyDoc_STRVAR(center__doc__,
"B.center(width[, fillchar]) -> copy of B\n"
"\n"
"Return B centered in a string of length width. Padding is\n"
"done using the specified fill character (default is a space).");
static PyObject *
stringlib_center(PyObject *self, PyObject *args)
{
Py_ssize_t marg, left;
Py_ssize_t width;
char fillchar = ' ';
if (!PyArg_ParseTuple(args, "n|c:center", &width, &fillchar))
return NULL;
if (STRINGLIB_LEN(self) >= width && STRINGLIB_CHECK_EXACT(self)) {
#if STRINGLIB_MUTABLE
/* We're defined as returning a copy; If the object is mutable
* that means we must make an identical copy. */
return STRINGLIB_NEW(STRINGLIB_STR(self), STRINGLIB_LEN(self));
#else
Py_INCREF(self);
return (PyObject*) self;
#endif
}
marg = width - STRINGLIB_LEN(self);
left = marg / 2 + (marg & width & 1);
return pad(self, left, marg - left, fillchar);
}
PyDoc_STRVAR(zfill__doc__,
"B.zfill(width) -> copy of B\n"
"\n"
"Pad a numeric string B with zeros on the left, to fill a field\n"
"of the specified width. B is never truncated.");
static PyObject *
stringlib_zfill(PyObject *self, PyObject *args)
{
Py_ssize_t fill;
PyObject *s;
char *p;
Py_ssize_t width;
if (!PyArg_ParseTuple(args, "n:zfill", &width))
return NULL;
if (STRINGLIB_LEN(self) >= width) {
if (STRINGLIB_CHECK_EXACT(self)) {
#if STRINGLIB_MUTABLE
/* We're defined as returning a copy; If the object is mutable
* that means we must make an identical copy. */
return STRINGLIB_NEW(STRINGLIB_STR(self), STRINGLIB_LEN(self));
#else
Py_INCREF(self);
return (PyObject*) self;
#endif
}
else
return STRINGLIB_NEW(
STRINGLIB_STR(self),
STRINGLIB_LEN(self)
);
}
fill = width - STRINGLIB_LEN(self);
s = pad(self, fill, 0, '0');
if (s == NULL)
return NULL;
p = STRINGLIB_STR(s);
if (p[fill] == '+' || p[fill] == '-') {
/* move sign to beginning of string */
p[0] = p[fill];
p[fill] = '0';
}
return (PyObject*) s;
}