* compile.[ch]: support for lambda()

* PROTO.h, mymalloc.h: added #ifdefs for TURBOC and GNUC.
* allobjects.h: added #include "rangeobject.h"
* Grammar: added lambda_input; relaxed syntax for exec.
* bltinmodule.c: added bagof, map, reduce, lambda, xrange.
* tupleobject.[ch]: added resizetuple().
* rangeobject.[ch]: new object type to speed up range operations (not
  convinced this is needed!!!)
This commit is contained in:
Guido van Rossum 1993-10-26 17:58:25 +00:00
parent 444fc7c90c
commit 12d12c5faf
12 changed files with 1683 additions and 750 deletions

View file

@ -37,6 +37,11 @@ OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
#include "compile.h"
#include "eval.h"
/* Forward */
static object *filterstring PROTO((object *, object *));
static object *filtertuple PROTO((object *, object *));
static object *exec_eval PROTO((object *v, int start));
static object *
builtin_abs(self, v)
object *self;
@ -61,6 +66,132 @@ builtin_apply(self, args)
return call_object(func, arglist);
}
static object *
builtin_bagof(self, args)
object *self;
object *args;
{
object *func, *seq, *arg, *result;
sequence_methods *sqf;
int len, newfunc = 0;
register int i,j;
static char bagof_err[] = "bagof() requires 1 or 2 args";
if (args == NULL) {
err_setstr(TypeError, bagof_err);
return NULL;
}
if (is_tupleobject(args)) {
if (gettuplesize(args) != 2) {
err_setstr(TypeError, bagof_err);
return NULL;
}
func = gettupleitem(args, 0);
seq = gettupleitem(args, 1);
if (is_stringobject(func)) {
if ((func = exec_eval(func, lambda_input)) == NULL)
return NULL;
newfunc = 1;
}
}
else {
func = None;
seq = args;
}
/* check for special cases; strings and tuples are returned as same */
if (is_stringobject(seq)) {
object *r = filterstring(func, seq);
if (newfunc)
DECREF(func);
return r;
}
else if (is_tupleobject(seq)) {
object *r = filtertuple(func, seq);
if (newfunc)
DECREF(func);
return r;
}
if (! (sqf = seq->ob_type->tp_as_sequence)) {
err_setstr(TypeError,
"argument to bagof() must be a sequence type");
goto Fail_2;
}
if ((len = (*sqf->sq_length)(seq)) < 0)
goto Fail_2;
if (is_listobject(seq) && seq->ob_refcnt == 1) {
INCREF(seq);
result = seq;
}
else
if ((result = newlistobject(len)) == NULL)
goto Fail_2;
if ((arg = newtupleobject(1)) == NULL)
goto Fail_1;
for (i = j = 0; i < len; ++i) {
object *ele, *value;
if (arg->ob_refcnt > 1) {
DECREF(arg);
if ((arg = newtupleobject(1)) == NULL)
goto Fail_1;
}
if ((ele = (*sqf->sq_item)(seq, i)) == NULL)
goto Fail_0;
if (func == None)
value = ele;
else {
if (settupleitem(arg, 0, ele) < 0)
goto Fail_0;
if ((value = call_object(func, arg)) == NULL)
goto Fail_0;
}
if (testbool(value)) {
INCREF(ele);
if (setlistitem(result, j++, ele) < 0)
goto Fail_0;
}
DECREF(value);
}
/* list_ass_slice() expects the rest of the list to be non-null */
for (i = j; i < len; ++i) {
INCREF(None);
if (setlistitem(result, i, None) < 0)
goto Fail_0;
}
DECREF(arg);
if (newfunc)
DECREF(func);
(*result->ob_type->tp_as_sequence->sq_ass_slice)(result, j, len, NULL);
return result;
Fail_0:
DECREF(arg);
Fail_1:
DECREF(result);
Fail_2:
if (newfunc)
DECREF(func);
return NULL;
}
static object *
builtin_chr(self, args)
object *self;
@ -191,6 +322,7 @@ exec_eval(v, start)
object *str = NULL, *globals = NULL, *locals = NULL;
char *s;
int n;
/* XXX This is a bit of a mess. Should make it varargs */
if (v != NULL) {
if (is_tupleobject(v) &&
((n = gettuplesize(v)) == 2 || n == 3)) {
@ -206,9 +338,10 @@ exec_eval(v, start)
globals != NULL && !is_dictobject(globals) ||
locals != NULL && !is_dictobject(locals)) {
err_setstr(TypeError,
"exec/eval arguments must be (string|code)[,dict[,dict]]");
"eval/lambda arguments must be (string|code)[,dict[,dict]]");
return NULL;
}
/* XXX The following is only correct for eval(), not for lambda() */
if (is_codeobject(str))
return eval_code((codeobject *) str, globals, locals,
(object *)NULL, (object *)NULL);
@ -217,7 +350,7 @@ exec_eval(v, start)
err_setstr(ValueError, "embedded '\\0' in string arg");
return NULL;
}
if (start == eval_input) {
if (start == eval_input || start == lambda_input) {
while (*s == ' ' || *s == '\t')
s++;
}
@ -335,6 +468,136 @@ builtin_id(self, args)
return newintobject((long)v);
}
static object *
builtin_map(self, args)
object *self;
object *args;
{
typedef struct {
object *seq;
sequence_methods *sqf;
int len;
} sequence;
object *func, *result;
sequence *seqs = NULL, *sqp;
int n, len, newfunc = 0;
register int i, j;
if (args == NULL || !is_tupleobject(args)) {
err_setstr(TypeError, "map() requires at least two args");
return NULL;
}
func = gettupleitem(args, 0);
n = gettuplesize(args) - 1;
if (is_stringobject(func)) {
if ((func = exec_eval(func, lambda_input)) == NULL)
return NULL;
newfunc = 1;
}
if ((seqs = (sequence *) malloc(n * sizeof(sequence))) == NULL)
return err_nomem();
for (len = -1, i = 0, sqp = seqs; i < n; ++i, ++sqp) {
int curlen;
if ((sqp->seq = gettupleitem(args, i + 1)) == NULL)
goto Fail_2;
if (! (sqp->sqf = sqp->seq->ob_type->tp_as_sequence)) {
static char errmsg[] =
"argument %d to map() must be a sequence object";
char errbuf[sizeof(errmsg) + 3];
sprintf(errbuf, errmsg, i+2);
err_setstr(TypeError, errbuf);
goto Fail_2;
}
if ((curlen = sqp->len = (*sqp->sqf->sq_length)(sqp->seq)) < 0)
goto Fail_2;
if (curlen > len)
len = curlen;
}
if ((result = (object *) newlistobject(len)) == NULL)
goto Fail_2;
if ((args = newtupleobject(n)) == NULL)
goto Fail_1;
for (i = 0; i < len; ++i) {
object *arg, *value;
if (args->ob_refcnt > 1) {
DECREF(args);
if ((args = newtupleobject(n)) == NULL)
goto Fail_1;
}
for (j = 0, sqp = seqs; j < n; ++j, ++sqp) {
if (i >= sqp->len) {
INCREF(None);
if (settupleitem(args, j, None) < 0)
goto Fail_0;
arg = None;
}
else {
if ((arg = (*sqp->sqf->sq_item)(sqp->seq, i)) == NULL)
goto Fail_0;
if (settupleitem(args, j, arg) < 0)
goto Fail_0;
}
}
if (func == None) {
if (n == 1) { /* avoid creating singleton */
INCREF(arg);
if (setlistitem(result, i, arg) < 0)
goto Fail_0;
}
else {
INCREF(args);
if (setlistitem(result, i, args) < 0)
goto Fail_0;
}
}
else {
if ((value = call_object(func, args)) == NULL)
goto Fail_0;
if (setlistitem((object *) result, i, value) < 0)
goto Fail_0;
}
}
if (seqs) free(seqs);
DECREF(args);
if (newfunc)
DECREF(func);
return result;
Fail_0:
DECREF(args);
Fail_1:
DECREF(result);
Fail_2:
if (newfunc)
DECREF(func);
if (seqs) free(seqs);
return NULL;
}
static object *
builtin_setattr(self, args)
object *self;
@ -413,6 +676,14 @@ builtin_int(self, v)
return (*nb->nb_int)(v);
}
static object *
builtin_lambda(self, v)
object *self;
object *v;
{
return exec_eval(v, lambda_input);
}
static object *
builtin_len(self, v)
object *self;
@ -640,6 +911,58 @@ builtin_range(self, v)
return v;
}
static object *
builtin_xrange(self, v)
object *self;
object *v;
{
static char *errmsg = "xrange() requires 1-3 int arguments";
int i, n;
long start, stop, step, len;
if (v != NULL && is_intobject(v))
start = 0, stop = getintvalue(v), step = 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) {
step = getintvalue(gettupleitem(v, 2));
--n;
}
else
step = 1;
stop = getintvalue(gettupleitem(v, --n));
if (n > 0)
start = getintvalue(gettupleitem(v, 0));
else
start = 0;
}
if (step == 0) {
err_setstr(ValueError, "zero step for xrange()");
return NULL;
}
len = (stop - start + step + ((step > 0) ? -1 : 1)) / step;
if (len < 0)
len = 0;
return newrangeobject(start, len, step, 1);
}
static object *
builtin_raw_input(self, v)
object *self;
@ -658,6 +981,103 @@ builtin_raw_input(self, v)
return filegetline(sysget("stdin"), -1);
}
static object *
builtin_reduce(self, args)
object *self;
object *args;
{
object *seq, *func, *result;
sequence_methods *sqf;
static char reduce_err[] = "reduce() requires 2 or 3 args";
register int i;
int start = 0, newfunc = 0;
int len;
if (args == NULL || !is_tupleobject(args)) {
err_setstr(TypeError, reduce_err);
return NULL;
}
switch (gettuplesize(args)) {
case 2:
start = 1; /* fall through */
case 3:
func = gettupleitem(args, 0);
seq = gettupleitem(args, 1);
break;
default:
err_setstr(TypeError, reduce_err);
}
if ((sqf = seq->ob_type->tp_as_sequence) == NULL) {
err_setstr(TypeError,
"2nd argument to reduce() must be a sequence object");
return NULL;
}
if (is_stringobject(func)) {
if ((func = exec_eval(func, lambda_input)) == NULL)
return NULL;
newfunc = 1;
}
if ((len = (*sqf->sq_length)(seq)) < 0)
goto Fail_2;
if (start == 1) {
if (len == 0) {
err_setstr(TypeError,
"reduce of empty sequence with no initial value");
goto Fail_2;
}
if ((result = (*sqf->sq_item)(seq, 0)) == NULL)
goto Fail_2;
}
else {
result = gettupleitem(args, 2);
INCREF(result);
}
if ((args = newtupleobject(2)) == NULL)
goto Fail_1;
for (i = start; i < len; ++i) {
object *op2;
if (args->ob_refcnt > 1) {
DECREF(args);
if ((args = newtupleobject(2)) == NULL)
goto Fail_1;
}
if ((op2 = (*sqf->sq_item)(seq, i)) == NULL)
goto Fail_2;
settupleitem(args, 0, result);
settupleitem(args, 1, op2);
if ((result = call_object(func, args)) == NULL)
goto Fail_0;
}
DECREF(args);
if (newfunc)
DECREF(func);
return result;
/* XXX I hate goto's. I hate goto's. I hate goto's. I hate goto's. */
Fail_0:
DECREF(args);
goto Fail_2;
Fail_1:
DECREF(result);
Fail_2:
if (newfunc)
DECREF(func);
return NULL;
}
static object *
builtin_reload(self, v)
object *self;
@ -740,6 +1160,7 @@ builtin_type(self, v)
static struct methodlist builtin_methods[] = {
{"abs", builtin_abs},
{"apply", builtin_apply},
{"bagof", builtin_bagof},
{"chr", builtin_chr},
{"cmp", builtin_cmp},
{"coerce", builtin_coerce},
@ -756,8 +1177,10 @@ static struct methodlist builtin_methods[] = {
{"id", builtin_id},
{"input", builtin_input},
{"int", builtin_int},
{"lambda", builtin_lambda},
{"len", builtin_len},
{"long", builtin_long},
{"map", builtin_map},
{"max", builtin_max},
{"min", builtin_min},
{"oct", builtin_oct},
@ -766,12 +1189,14 @@ static struct methodlist builtin_methods[] = {
{"pow", builtin_pow},
{"range", builtin_range},
{"raw_input", builtin_raw_input},
{"reduce", builtin_reduce},
{"reload", builtin_reload},
{"repr", builtin_repr},
{"round", builtin_round},
{"setattr", builtin_setattr},
{"str", builtin_str},
{"type", builtin_type},
{"xrange", builtin_xrange},
{NULL, NULL},
};
@ -883,3 +1308,155 @@ coerce(pv, pw)
err_setstr(TypeError, "number coercion failed");
return -1;
}
/* Filter a tuple through a function */
static object *
filtertuple(func, tuple)
object *func;
object *tuple;
{
object *arg, *result;
register int i, j;
int len = gettuplesize(tuple), shared = 0;
if (tuple->ob_refcnt == 1) {
result = tuple;
shared = 1;
/* defer INCREF (resizetuple wants it to be one) */
}
else
if ((result = newtupleobject(len)) == NULL)
return NULL;
if ((arg = newtupleobject(1)) == NULL)
goto Fail_1;
for (i = j = 0; i < len; ++i) {
object *ele, *value;
if (arg->ob_refcnt > 1) {
DECREF(arg);
if ((arg = newtupleobject(1)) == NULL)
goto Fail_1;
}
if ((ele = gettupleitem(tuple, i)) == NULL)
goto Fail_0;
INCREF(ele);
if (func == None)
value = ele;
else {
if (settupleitem(arg, 0, ele) < 0)
goto Fail_0;
if ((value = call_object(func, arg)) == NULL)
goto Fail_0;
}
if (testbool(value)) {
INCREF(ele);
if (settupleitem(result, j++, ele) < 0)
goto Fail_0;
}
DECREF(value);
}
DECREF(arg);
if (resizetuple(&result, j) < 0)
return NULL;
if (shared)
INCREF(result);
return result;
Fail_0:
DECREF(arg);
Fail_1:
if (!shared)
DECREF(result);
return NULL;
}
/* Filter a string through a function */
static object *
filterstring(func, strobj)
object *func;
object *strobj;
{
object *arg, *result;
register int i, j;
int len = getstringsize(strobj), shared = 0;
if (strobj->ob_refcnt == 1) {
result = strobj;
shared = 1;
/* defer INCREF (resizestring wants it to be one) */
if (func == None) {
INCREF(result);
return result;
}
}
else {
if ((result = newsizedstringobject(NULL, len)) == NULL)
return NULL;
if (func == None) {
strcpy(GETSTRINGVALUE((stringobject *)result),
GETSTRINGVALUE((stringobject *)strobj));
return result;
}
}
if ((arg = newtupleobject(1)) == NULL)
goto Fail_1;
for (i = j = 0; i < len; ++i) {
object *ele, *value;
if (arg->ob_refcnt > 1) {
DECREF(arg);
if ((arg = newtupleobject(1)) == NULL)
goto Fail_1;
}
if ((ele = (*strobj->ob_type->tp_as_sequence->sq_item)
(strobj, i)) == NULL)
goto Fail_0;
if (settupleitem(arg, 0, ele) < 0)
goto Fail_0;
if ((value = call_object(func, arg)) == NULL)
goto Fail_0;
if (testbool(value))
GETSTRINGVALUE((stringobject *)result)[j++] =
GETSTRINGVALUE((stringobject *)ele)[0];
DECREF(value);
}
DECREF(arg);
if (resizestring(&result, j) < 0)
return NULL;
if (shared)
INCREF(result);
return result;
Fail_0:
DECREF(arg);
Fail_1:
if (!shared)
DECREF(result);
return NULL;
}