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/*
** compar.c - Comparable module
**
** See Copyright Notice in mruby.h
*/
#include "mruby.h"
#include "mruby/string.h"
#include "mruby/numeric.h"
void
mrb_cmperr(mrb_state *mrb, mrb_value x, mrb_value y)
{
const char *classname;
if (SPECIAL_CONST_P(y)) {
y = mrb_inspect(mrb, y);
//classname = StringValuePtr(y);
classname = mrb_string_value_ptr(mrb, y);
}
else {
classname = mrb_obj_classname(mrb, y);
}
mrb_raise(mrb, E_ARGUMENT_ERROR, "comparison of %s with %s failed",
mrb_obj_classname(mrb, x), classname);
}
int
mrb_cmpint(mrb_state *mrb, mrb_value val, mrb_value a, mrb_value b)
{
if (mrb_nil_p(val)) {
mrb_cmperr(mrb, a, b);
}
if (FIXNUM_P(val)) {
long l = mrb_fixnum(val);
if (l > 0) return 1;
if (l < 0) return -1;
return 0;
}
if (mrb_test(mrb_funcall(mrb, val, ">", 1, mrb_fixnum_value(0)))) return 1;
if (mrb_test(mrb_funcall(mrb, val, "<", 1, mrb_fixnum_value(0)))) return -1;
return 0;
}
static mrb_value
cmp_equal(mrb_state *mrb, mrb_value x)
{
mrb_value y, c;
/* *** TEMPORAL IMPLEMENT *** */
mrb_get_args(mrb, "o", &y);
if (mrb_obj_equal(mrb, x, y)) return mrb_true_value();
c = mrb_funcall(mrb, x, "<=>", 1, y);
if (mrb_cmpint(mrb, c, x, y) == 0) return mrb_true_value();
return mrb_false_value();
}
#include <stdio.h>
static mrb_value
cmp_gt(mrb_state *mrb, mrb_value x, mrb_value y)
{
mrb_value c;
c = mrb_funcall(mrb, x, "<=>", 1, y);
if (mrb_cmpint(mrb, c, x, y) > 0) return mrb_true_value();
return mrb_false_value();
}
static mrb_value
cmp_gt_m(mrb_state *mrb, mrb_value x)
{
mrb_value y;
mrb_get_args(mrb, "o", &y);
return cmp_gt(mrb, x, y);
}
static mrb_value
cmp_ge_m(mrb_state *mrb, mrb_value x)
{
mrb_value y, c;
mrb_get_args(mrb, "o", &y);
c = mrb_funcall(mrb, x, "<=>", 1, y);
if (mrb_cmpint(mrb, c, x, y) >= 0) return mrb_true_value();
return mrb_false_value();
}
static mrb_value
cmp_lt(mrb_state *mrb, mrb_value x, mrb_value y)
{
mrb_value c;
c = mrb_funcall(mrb, x, "<=>", 1, y);
if (mrb_cmpint(mrb, c, x, y) < 0) return mrb_true_value();
return mrb_false_value();
}
static mrb_value
cmp_lt_m(mrb_state *mrb, mrb_value x)
{
mrb_value y;
mrb_get_args(mrb, "o", &y);
return cmp_lt(mrb, x, y);
}
static mrb_value
cmp_le_m(mrb_state *mrb, mrb_value x)
{
mrb_value y, c;
mrb_get_args(mrb, "o", &y);
c = mrb_funcall(mrb, x, "<=>", 1, y);
if (mrb_cmpint(mrb, c, x, y) <= 0) return mrb_true_value();
return mrb_false_value();
}
static mrb_value
cmp_between(mrb_state *mrb, mrb_value x)
{
mrb_value min, max;
mrb_get_args(mrb, "oo", &min, &max);
if (mrb_test(cmp_lt(mrb, x, min))) return mrb_false_value();
if (mrb_test(cmp_gt(mrb, x, max))) return mrb_false_value();
return mrb_true_value();
}
void
mrb_init_comparable(mrb_state *mrb)
{
struct RClass *comp;
comp = mrb_define_module(mrb, "Comparable");
mrb_define_method(mrb, comp, "<", cmp_lt_m, ARGS_REQ(1)); /* 15.3.3.2.1 */
mrb_define_method(mrb, comp, "<=", cmp_le_m, ARGS_REQ(1)); /* 15.3.3.2.2 */
mrb_define_method(mrb, comp, "==", cmp_equal, ARGS_REQ(1)); /* 15.3.3.2.3 */
mrb_define_method(mrb, comp, ">", cmp_gt_m, ARGS_REQ(1)); /* 15.3.3.2.4 */
mrb_define_method(mrb, comp, ">=", cmp_ge_m, ARGS_REQ(1)); /* 15.3.3.2.5 */
mrb_define_method(mrb, comp, "between?", cmp_between, ARGS_REQ(2)); /* 15.3.3.2.6 */
}
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