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Patch by Nick and Stephanie Lockwood to implement complex() with a string 

argument.  This closes TODO item 2.19.
This commit is contained in:
Guido van Rossum 1999-03-25 21:16:07 +00:00
parent 5fc9c869dd
commit 1195023b89
1 changed files with 133 additions and 4 deletions
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137
Python/bltinmodule.c
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@ -394,6 +394,133 @@ single (interactive) statement, or 'eval' to compile an expression.";
#ifndef WITHOUT_COMPLEX
static PyObject *
complex_from_string(v)
PyObject *v;
{
extern double strtod Py_PROTO((const char *, char **));
char a, *s, *start, *end;
double x=0.0, y=0.0, z;
int got_re=0, got_im=0, done=0;
int digit_or_dot;
int sw_error=0;
int sign;
char buffer[256]; /* For errors */
start = s = PyString_AS_STRING(v);
/* position on first nonblank */
while (*s && isspace(Py_CHARMASK(*s)))
s++;
if (s[0] == '\0') {
PyErr_SetString(PyExc_ValueError,
"empty string for complex()");
return NULL;
}
z = -1.0;
sign = 1;
do {
switch (*s) {
case '\0':
if (s-start != PyString_GET_SIZE(v)) {
PyErr_SetString(
PyExc_ValueError,
"null byte in argument for complex()");
return NULL;
}
if(!done) sw_error=1;
break;
case '-':
sign = -1;
/* Fallthrough */
case '+':
if (done) sw_error=1;
s++;
if ( *s=='\0'||*s=='+'||*s=='-' ||
isspace(Py_CHARMASK(*s)) ) sw_error=1;
break;
case 'J':
case 'j':
if (got_im || done) {
sw_error = 1;
break;
}
if (z<0.0) {
y=sign;
}
else{
y=sign*z;
}
got_im=1;
s++;
if (*s!='+' && *s!='-' )
done=1;
break;
default:
if (isspace(Py_CHARMASK(*s))) {
while (*s && isspace(Py_CHARMASK(*s)))
s++;
if (s[0] != '\0')
sw_error=1;
else
done = 1;
break;
}
digit_or_dot =
(*s=='.' || isdigit(Py_CHARMASK(*s)));
if (done||!digit_or_dot) {
sw_error=1;
break;
}
errno = 0;
PyFPE_START_PROTECT("strtod", return 0)
z = strtod(s, &end) ;
PyFPE_END_PROTECT(z)
if (errno != 0) {
sprintf(buffer,
"float() out of range: %.150s", s);
PyErr_SetString(
PyExc_ValueError,
buffer);
return NULL;
}
s=end;
if (*s=='J' || *s=='j') {
break;
}
if (got_re) {
sw_error=1;
break;
}
/* accept a real part */
x=sign*z;
got_re=1;
if (got_im) done=1;
z = -1.0;
sign = 1;
break;
} /* end of switch */
} while (*s!='\0' && !sw_error);
if (sw_error) {
PyErr_SetString(PyExc_ValueError,
"malformed string for complex()");
return NULL;
}
return PyComplex_FromDoubles(x,y);
}
static PyObject *
builtin_complex(self, args)
PyObject *self;
@ -407,6 +534,8 @@ builtin_complex(self, args)
i = NULL;
if (!PyArg_ParseTuple(args, "O|O:complex", &r, &i))
return NULL;
if (PyString_Check(r))
return complex_from_string(r);
if ((nbr = r->ob_type->tp_as_number) == NULL ||
nbr->nb_float == NULL ||
(i != NULL &&
@ -455,11 +584,11 @@ builtin_complex(self, args)
return NULL;
cr.real = PyFloat_AsDouble(tmp);
Py_DECREF(tmp);
cr.imag = 0.;
cr.imag = 0.0;
}
if (i == NULL) {
ci.real = 0.;
ci.imag = 0.;
ci.real = 0.0;
ci.imag = 0.0;
}
else if (PyComplex_Check(i))
ci = ((PyComplexObject*)i)->cval;
@ -2032,7 +2161,7 @@ PyObject *PyExc_ZeroDivisionError;
PyObject *PyExc_MemoryErrorInst;
static struct
static struct
{
char* name;
PyObject** exc;