cpython/Python/bltinmodule.c

/***********************************************************
Copyright 1991, 1992 by Stichting Mathematisch Centrum, Amsterdam, The
Netherlands.

                        All Rights Reserved

Permission to use, copy, modify, and distribute this software and its 
documentation for any purpose and without fee is hereby granted, 
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in 
supporting documentation, and that the names of Stichting Mathematisch
Centrum or CWI not be used in advertising or publicity pertaining to
distribution of the software without specific, written prior permission.

STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

******************************************************************/

/* Built-in functions */

#include "allobjects.h"

#include "node.h"
#include "graminit.h"
#include "errcode.h"
#include "sysmodule.h"
#include "bltinmodule.h"
#include "import.h"
#include "pythonrun.h"
#include "ceval.h"
#include "modsupport.h"

static object *
builtin_abs(self, v)
	object *self;
	object *v;
{
	number_methods *nm;
	if (v == NULL || (nm = v->ob_type->tp_as_number) == NULL) {
		err_setstr(TypeError, "abs() requires numeric argument");
		return NULL;
	}
	return (*nm->nb_absolute)(v);
}

static object *
builtin_apply(self, args)
	object *self;
	object *args;
{
	object *func, *arglist;
	if (!getargs(args, "(OO)", &func, &arglist))
		return NULL;
	return call_object(func, arglist);
}

static object *
builtin_chr(self, args)
	object *self;
	object *args;
{
	long x;
	char s[1];
	if (!getargs(args, "l", &x))
		return NULL;
	if (x < 0 || x >= 256) {
		err_setstr(ValueError, "chr() arg not in range(256)");
		return NULL;
	}
	s[0] = x;
	return newsizedstringobject(s, 1);
}

static object *
builtin_cmp(self, args)
	object *self;
	object *args;
{
	object *a, *b;
	if (!getargs(args, "(OO)", &a, &b))
		return NULL;
	return newintobject((long)cmpobject(a, b));
}

static object *
builtin_coerce(self, args)
	object *self;
	object *args;
{
	object *v, *w;
	object *res;

	if (!getargs(args, "(OO)", &v, &w))
		return NULL;
	if (coerce(&v, &w) < 0)
		return NULL;
	res = mkvalue("(OO)", v, w);
	DECREF(v);
	DECREF(w);
	return res;
}

static object *
builtin_dir(self, v)
	object *self;
	object *v;
{
	object *d;
	if (v == NULL) {
		d = getlocals();
		INCREF(d);
	}
	else {
		d = getattr(v, "__dict__");
		if (d == NULL) {
			err_setstr(TypeError,
				"dir() argument must have __dict__ attribute");
			return NULL;
		}
	}
	if (is_dictobject(d)) {
		v = getdictkeys(d);
		if (sortlist(v) != 0) {
			DECREF(v);
			v = NULL;
		}
	}
	else {
		v = newlistobject(0);
	}
	DECREF(d);
	return v;
}

static object *
builtin_divmod(self, args)
	object *self;
	object *args;
{
	object *v, *w, *x;
	if (!getargs(args, "(OO)", &v, &w))
		return NULL;
	if (v->ob_type->tp_as_number == NULL ||
				w->ob_type->tp_as_number == NULL) {
		err_setstr(TypeError, "divmod() requires numeric arguments");
		return NULL;
	}
	if (coerce(&v, &w) != 0)
		return NULL;
	x = (*v->ob_type->tp_as_number->nb_divmod)(v, w);
	DECREF(v);
	DECREF(w);
	return x;
}

static object *
exec_eval(v, start)
	object *v;
	int start;
{
	object *str = NULL, *globals = NULL, *locals = NULL;
	char *s;
	int n;
	if (v != NULL) {
		if (is_stringobject(v))
			str = v;
		else if (is_tupleobject(v) &&
				((n = gettuplesize(v)) == 2 || n == 3)) {
			str = gettupleitem(v, 0);
			globals = gettupleitem(v, 1);
			if (n == 3)
				locals = gettupleitem(v, 2);
		}
	}
	if (str == NULL || !is_stringobject(str) ||
			globals != NULL && !is_dictobject(globals) ||
			locals != NULL && !is_dictobject(locals)) {
		err_setstr(TypeError,
		    "exec/eval arguments must be string[,dict[,dict]]");
		return NULL;
	}
	s = getstringvalue(str);
	if (strlen(s) != getstringsize(str)) {
		err_setstr(ValueError, "embedded '\\0' in string arg");
		return NULL;
	}
	if (start == eval_input) {
		while (*s == ' ' || *s == '\t')
			s++;
	}
	return run_string(s, start, globals, locals);
}

static object *
builtin_eval(self, v)
	object *self;
	object *v;
{
	return exec_eval(v, eval_input);
}

static object *
builtin_exec(self, v)
	object *self;
	object *v;
{
	return exec_eval(v, file_input);
}

static object *
builtin_execfile(self, v)
	object *self;
	object *v;
{
	object *str = NULL, *globals = NULL, *locals = NULL, *w;
	FILE* fp;
	char *s;
	int n;
	if (v != NULL) {
		if (is_stringobject(v))
			str = v;
		else if (is_tupleobject(v) &&
				((n = gettuplesize(v)) == 2 || n == 3)) {
			str = gettupleitem(v, 0);
			globals = gettupleitem(v, 1);
			if (n == 3)
				locals = gettupleitem(v, 2);
		}
	}
	if (str == NULL || !is_stringobject(str) ||
			globals != NULL && !is_dictobject(globals) ||
			locals != NULL && !is_dictobject(locals)) {
		err_setstr(TypeError,
		    "execfile arguments must be filename[,dict[,dict]]");
		return NULL;
	}
	s = getstringvalue(str);
	if (strlen(s) != getstringsize(str)) {
		err_setstr(ValueError, "embedded '\\0' in string arg");
		return NULL;
	}
	BGN_SAVE
	fp = fopen(s, "r");
	END_SAVE
	if (fp == NULL) {
		err_setstr(IOError, "execfile cannot open the file argument");
		return NULL;
	}
	w = run_file(fp, getstringvalue(str), file_input, globals, locals);
	BGN_SAVE
	fclose(fp);
	END_SAVE
	return w;
}

static object *
builtin_float(self, v)
	object *self;
	object *v;
{
	number_methods *nb;
	
	if (v == NULL || (nb = v->ob_type->tp_as_number) == NULL ||
	    nb->nb_float == NULL) {
		err_setstr(TypeError,
			   "float() argument can't be converted to float");
		return NULL;
	}
	return (*nb->nb_float)(v);
}

static object *
builtin_getattr(self, args)
	object *self;
	object *args;
{
	object *v;
	char *name;
	if (!getargs(args, "(Os)", &v, &name))
		return NULL;
	return getattr(v, name);
}

static object *
builtin_setattr(self, args)
	object *self;
	object *args;
{
	object *v;
	char *name;
	object *value;
	if (!getargs(args, "(OsO)", &v, &name, &value))
		return NULL;
	if (setattr(v, name, value) != 0)
		return NULL;
	INCREF(None);
	return None;
}

static object *
builtin_hex(self, v)
	object *self;
	object *v;
{
	number_methods *nb;
	
	if (v == NULL || (nb = v->ob_type->tp_as_number) == NULL ||
	    nb->nb_hex == NULL) {
		err_setstr(TypeError,
			   "hex() argument can't be converted to hex");
		return NULL;
	}
	return (*nb->nb_hex)(v);
}

static object *builtin_raw_input PROTO((object *, object *));

static object *
builtin_input(self, v)
	object *self;
	object *v;
{
	object *line = builtin_raw_input(self, v);
	if (line == NULL)
		return line;
	v = exec_eval(line, eval_input);
	DECREF(line);
	return v;
}

static object *
builtin_int(self, v)
	object *self;
	object *v;
{
	number_methods *nb;
	
	if (v == NULL || (nb = v->ob_type->tp_as_number) == NULL ||
	    nb->nb_int == NULL) {
		err_setstr(TypeError,
			   "int() argument can't be converted to int");
		return NULL;
	}
	return (*nb->nb_int)(v);
}

static object *
builtin_len(self, v)
	object *self;
	object *v;
{
	long len;
	typeobject *tp;
	if (v == NULL) {
		err_setstr(TypeError, "len() without argument");
		return NULL;
	}
	tp = v->ob_type;
	if (tp->tp_as_sequence != NULL) {
		len = (*tp->tp_as_sequence->sq_length)(v);
	}
	else if (tp->tp_as_mapping != NULL) {
		len = (*tp->tp_as_mapping->mp_length)(v);
	}
	else {
		err_setstr(TypeError, "len() of unsized object");
		return NULL;
	}
	if (len < 0)
		return NULL;
	else
		return newintobject(len);
}

static object *
builtin_long(self, v)
	object *self;
	object *v;
{
	number_methods *nb;
	
	if (v == NULL || (nb = v->ob_type->tp_as_number) == NULL ||
	    nb->nb_long == NULL) {
		err_setstr(TypeError,
			   "long() argument can't be converted to long");
		return NULL;
	}
	return (*nb->nb_long)(v);
}

static object *
min_max(v, sign)
	object *v;
	int sign;
{
	int i, n, cmp;
	object *w, *x;
	sequence_methods *sq;
	if (v == NULL) {
		err_setstr(TypeError, "min() or max() without argument");
		return NULL;
	}
	sq = v->ob_type->tp_as_sequence;
	if (sq == NULL) {
		err_setstr(TypeError, "min() or max() of non-sequence");
		return NULL;
	}
	n = (*sq->sq_length)(v);
	if (n < 0)
		return NULL;
	if (n == 0) {
		err_setstr(ValueError, "min() or max() of empty sequence");
		return NULL;
	}
	w = (*sq->sq_item)(v, 0); /* Implies INCREF */
	for (i = 1; i < n; i++) {
		x = (*sq->sq_item)(v, i); /* Implies INCREF */
		cmp = cmpobject(x, w);
		if (cmp * sign > 0) {
			DECREF(w);
			w = x;
		}
		else
			DECREF(x);
	}
	return w;
}

static object *
builtin_min(self, v)
	object *self;
	object *v;
{
	return min_max(v, -1);
}

static object *
builtin_max(self, v)
	object *self;
	object *v;
{
	return min_max(v, 1);
}

static object *
builtin_oct(self, v)
	object *self;
	object *v;
{
	number_methods *nb;
	
	if (v == NULL || (nb = v->ob_type->tp_as_number) == NULL ||
	    nb->nb_oct == NULL) {
		err_setstr(TypeError,
			   "oct() argument can't be converted to oct");
		return NULL;
	}
	return (*nb->nb_oct)(v);
}

static object *
builtin_open(self, args)
	object *self;
	object *args;
{
	char *name, *mode;
	if (!getargs(args, "(ss)", &name, &mode))
		return NULL;
	return newfileobject(name, mode);
}

static object *
builtin_ord(self, args)
	object *self;
	object *args;
{
	char *s;
	int len;
	if (!getargs(args, "s#", &s, &len))
		return NULL;
	if (len != 1) {
		err_setstr(ValueError, "ord() arg must have length 1");
		return NULL;
	}
	return newintobject((long)(s[0] & 0xff));
}

static object *
builtin_pow(self, args)
	object *self;
	object *args;
{
	object *v, *w, *x;
	if (!getargs(args, "(OO)", &v, &w))
		return NULL;
	if (v->ob_type->tp_as_number == NULL ||
				w->ob_type->tp_as_number == NULL) {
		err_setstr(TypeError, "pow() requires numeric arguments");
		return NULL;
	}
	if (coerce(&v, &w) != 0)
		return NULL;
	x = (*v->ob_type->tp_as_number->nb_power)(v, w);
	DECREF(v);
	DECREF(w);
	return x;
}

static object *
builtin_range(self, v)
	object *self;
	object *v;
{
	static char *errmsg = "range() requires 1-3 int arguments";
	int i, n;
	long ilow, ihigh, istep;
	if (v != NULL && is_intobject(v)) {
		ilow = 0; ihigh = getintvalue(v); istep = 1;
	}
	else if (v == NULL || !is_tupleobject(v)) {
		err_setstr(TypeError, errmsg);
		return NULL;
	}
	else {
		n = gettuplesize(v);
		if (n < 1 || n > 3) {
			err_setstr(TypeError, errmsg);
			return NULL;
		}
		for (i = 0; i < n; i++) {
			if (!is_intobject(gettupleitem(v, i))) {
				err_setstr(TypeError, errmsg);
				return NULL;
			}
		}
		if (n == 3) {
			istep = getintvalue(gettupleitem(v, 2));
			--n;
		}
		else
			istep = 1;
		ihigh = getintvalue(gettupleitem(v, --n));
		if (n > 0)
			ilow = getintvalue(gettupleitem(v, 0));
		else
			ilow = 0;
	}
	if (istep == 0) {
		err_setstr(ValueError, "zero step for range()");
		return NULL;
	}
	/* XXX ought to check overflow of subtraction */
	if (istep > 0)
		n = (ihigh - ilow + istep - 1) / istep;
	else
		n = (ihigh - ilow + istep + 1) / istep;
	if (n < 0)
		n = 0;
	v = newlistobject(n);
	if (v == NULL)
		return NULL;
	for (i = 0; i < n; i++) {
		object *w = newintobject(ilow);
		if (w == NULL) {
			DECREF(v);
			return NULL;
		}
		setlistitem(v, i, w);
		ilow += istep;
	}
	return v;
}

static object *
builtin_raw_input(self, v)
	object *self;
	object *v;
{
	object *f = sysget("stdout");
	if (f == NULL) {
		err_setstr(RuntimeError, "lost sys.stdout");
		return NULL;
	}
	flushline();
	if (v != NULL) {
		if (writeobject(v, f, PRINT_RAW) != 0)
			return NULL;
	}
	return filegetline(sysget("stdin"), -1);
}

static object *
builtin_reload(self, v)
	object *self;
	object *v;
{
	return reload_module(v);
}

static object *
builtin_repr(self, v)
	object *self;
	object *v;
{
	if (v == NULL) {
		err_badarg();
		return NULL;
	}
	return reprobject(v);
}

static object *
builtin_str(self, v)
	object *self;
	object *v;
{
	if (v == NULL) {
		err_badarg();
		return NULL;
	}
	if (is_stringobject(v)) {
		INCREF(v);
		return v;
	}
	else
		return reprobject(v);
}

static object *
builtin_type(self, v)
	object *self;
	object *v;
{
	if (v == NULL) {
		err_setstr(TypeError, "type() requires an argument");
		return NULL;
	}
	v = (object *)v->ob_type;
	INCREF(v);
	return v;
}

static struct methodlist builtin_methods[] = {
	{"abs",		builtin_abs},
	{"apply",	builtin_apply},
	{"chr",		builtin_chr},
	{"cmp",		builtin_cmp},
	{"coerce",	builtin_coerce},
	{"dir",		builtin_dir},
	{"divmod",	builtin_divmod},
	{"eval",	builtin_eval},
	{"exec",	builtin_exec},
	{"execfile",	builtin_execfile},
	{"float",	builtin_float},
	{"getattr",	builtin_getattr},
	{"hex",		builtin_hex},
	{"input",	builtin_input},
	{"int",		builtin_int},
	{"len",		builtin_len},
	{"long",	builtin_long},
	{"max",		builtin_max},
	{"min",		builtin_min},
	{"oct",		builtin_oct},
	{"open",	builtin_open},
	{"ord",		builtin_ord},
	{"pow",		builtin_pow},
	{"range",	builtin_range},
	{"raw_input",	builtin_raw_input},
	{"reload",	builtin_reload},
	{"repr",	builtin_repr},
	{"setattr",	builtin_setattr},
	{"str",		builtin_str},
	{"type",	builtin_type},
	{NULL,		NULL},
};

static object *builtin_dict;

object *
getbuiltin(name)
	object *name;
{
	return dict2lookup(builtin_dict, name);
}

/* Predefined exceptions */

object *AttributeError;
object *EOFError;
object *IOError;
object *ImportError;
object *IndexError;
object *KeyError;
object *KeyboardInterrupt;
object *MemoryError;
object *NameError;
object *OverflowError;
object *RuntimeError;
object *SyntaxError;
object *SystemError;
object *SystemExit;
object *TypeError;
object *ValueError;
object *ZeroDivisionError;

static object *
newstdexception(name)
	char *name;
{
	object *v = newstringobject(name);
	if (v == NULL || dictinsert(builtin_dict, name, v) != 0)
		fatal("no mem for new standard exception");
	return v;
}

static void
initerrors()
{
	AttributeError = newstdexception("AttributeError");
	EOFError = newstdexception("EOFError");
	IOError = newstdexception("IOError");
	ImportError = newstdexception("ImportError");
	IndexError = newstdexception("IndexError");
	KeyError = newstdexception("KeyError");
	KeyboardInterrupt = newstdexception("KeyboardInterrupt");
	MemoryError = newstdexception("MemoryError");
	NameError = newstdexception("NameError");
	OverflowError = newstdexception("OverflowError");
	RuntimeError = newstdexception("RuntimeError");
	SyntaxError = newstdexception("SyntaxError");
	SystemError = newstdexception("SystemError");
	SystemExit = newstdexception("SystemExit");
	TypeError = newstdexception("TypeError");
	ValueError = newstdexception("ValueError");
	ZeroDivisionError = newstdexception("ZeroDivisionError");
}

void
initbuiltin()
{
	object *m;
	m = initmodule("builtin", builtin_methods);
	builtin_dict = getmoduledict(m);
	INCREF(builtin_dict);
	initerrors();
	(void) dictinsert(builtin_dict, "None", None);
}

/* Coerce two numeric types to the "larger" one.
   Increment the reference count on each argument.
   Return -1 and raise an exception if no coercion is possible
   (and then no reference count is incremented).
*/

int
coerce(pv, pw)
	object **pv, **pw;
{
	register object *v = *pv;
	register object *w = *pw;
	int res;

	if (v->ob_type == w->ob_type) {
		INCREF(v);
		INCREF(w);
		return 0;
	}
	if (v->ob_type->tp_as_number && v->ob_type->tp_as_number->nb_coerce) {
		res = (*v->ob_type->tp_as_number->nb_coerce)(pv, pw);
		if (res <= 0)
			return res;
	}
	if (w->ob_type->tp_as_number && w->ob_type->tp_as_number->nb_coerce) {
		res = (*w->ob_type->tp_as_number->nb_coerce)(pw, pv);
		if (res <= 0)
			return res;
	}
	err_setstr(TypeError, "number coercion failed");
	return -1;
}