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/**********************************************************************
compar.c -
$Author$
$Date$
created at: Thu Aug 26 14:39:48 JST 1993
Copyright (C) 1993-2002 Yukihiro Matsumoto
**********************************************************************/
#include "ruby.h"
VALUE rb_mComparable;
static ID cmp;
int
rb_cmpint(val)
VALUE val;
{
if (FIXNUM_P(val)) return FIX2INT(val);
if (TYPE(val) == T_BIGNUM) {
if (RBIGNUM(val)->sign) return 1;
return -1;
}
if (RTEST(rb_funcall(val, '>', 1, INT2FIX(0)))) return 1;
if (RTEST(rb_funcall(val, '<', 1, INT2FIX(0)))) return -1;
return 0;
}
static VALUE
cmp_equal(x, y)
VALUE x, y;
{
int c;
if (x == y) return Qtrue;
c = rb_funcall(x, cmp, 1, y);
if (NIL_P(c)) return Qfalse;
if (c == INT2FIX(0)) return Qtrue;
if (rb_cmpint(c) == 0) return Qtrue;
return Qfalse;
}
static VALUE
cmp_gt(x, y)
VALUE x, y;
{
VALUE c = rb_funcall(x, cmp, 1, y);
if (NIL_P(c)) return Qfalse;
if (rb_cmpint(c) > 0) return Qtrue;
return Qfalse;
}
static VALUE
cmp_ge(x, y)
VALUE x, y;
{
VALUE c = rb_funcall(x, cmp, 1, y);
if (NIL_P(c)) return Qfalse;
if (rb_cmpint(c) >= 0) return Qtrue;
return Qfalse;
}
static VALUE
cmp_lt(x, y)
VALUE x, y;
{
VALUE c = rb_funcall(x, cmp, 1, y);
if (rb_cmpint(c) < 0) return Qtrue;
return Qfalse;
}
static VALUE
cmp_le(x, y)
VALUE x, y;
{
VALUE c = rb_funcall(x, cmp, 1, y);
if (NIL_P(c)) return Qfalse;
if (rb_cmpint(c) <= 0) return Qtrue;
return Qfalse;
}
static VALUE
cmp_between(x, min, max)
VALUE x, min, max;
{
if (cmp_lt(x, min)) return Qfalse;
if (cmp_gt(x, max)) return Qfalse;
return Qtrue;
}
void
Init_Comparable()
{
rb_mComparable = rb_define_module("Comparable");
rb_define_method(rb_mComparable, "==", cmp_equal, 1);
rb_define_method(rb_mComparable, ">", cmp_gt, 1);
rb_define_method(rb_mComparable, ">=", cmp_ge, 1);
rb_define_method(rb_mComparable, "<", cmp_lt, 1);
rb_define_method(rb_mComparable, "<=", cmp_le, 1);
rb_define_method(rb_mComparable, "between?", cmp_between, 2);
cmp = rb_intern("<=>");
}
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