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/************************************************
compar.c -
$Author$
$Date$
created at: Thu Aug 26 14:39:48 JST 1993
Copyright (C) 1993-2000 Yukihiro Matsumoto
************************************************/
#include "ruby.h"
VALUE rb_mComparable;
static ID cmp;
static VALUE
cmp_eq(a)
VALUE *a;
{
VALUE c = rb_funcall(a[0], cmp, 1, a[1]);
int t = NUM2INT(c);
if (t == 0) return Qtrue;
return Qfalse;
}
static VALUE
cmp_failed()
{
return Qfalse;
}
static VALUE
cmp_equal(x, y)
VALUE x, y;
{
VALUE a[2];
if (x == y) return Qtrue;
a[0] = x; a[1] = y;
return rb_rescue(cmp_eq, (VALUE)a, cmp_failed, 0);
}
static VALUE
cmp_gt(x, y)
VALUE x, y;
{
VALUE c = rb_funcall(x, cmp, 1, y);
int t = NUM2INT(c);
if (t > 0) return Qtrue;
return Qfalse;
}
static VALUE
cmp_ge(x, y)
VALUE x, y;
{
VALUE c = rb_funcall(x, cmp, 1, y);
int t = NUM2INT(c);
if (t >= 0) return Qtrue;
return Qfalse;
}
static VALUE
cmp_lt(x, y)
VALUE x, y;
{
VALUE c = rb_funcall(x, cmp, 1, y);
int t = NUM2INT(c);
if (t < 0) return Qtrue;
return Qfalse;
}
static VALUE
cmp_le(x, y)
VALUE x, y;
{
VALUE c = rb_funcall(x, cmp, 1, y);
int t = NUM2INT(c);
if (t <= 0) return Qtrue;
return Qfalse;
}
static VALUE
cmp_between(x, min, max)
VALUE x, min, max;
{
VALUE c = rb_funcall(x, cmp, 1, min);
long t = NUM2LONG(c);
if (t < 0) return Qfalse;
c = rb_funcall(x, cmp, 1, max);
t = NUM2LONG(c);
if (t > 0) 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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