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/************************************************
range.c -
$Author: matz $
$Date: 1994/12/06 09:30:12 $
created at: Thu Aug 19 17:46:47 JST 1993
Copyright (C) 1995 Yukihiro Matsumoto
************************************************/
#include "ruby.h"
VALUE M_Comparable;
VALUE C_Range;
static ID next;
static VALUE
Srng_new(class, start, end)
VALUE class, start, end;
{
VALUE obj;
if (!obj_is_kind_of(start, M_Comparable) || TYPE(start) != TYPE(end)) {
Fail("bad value for range");
}
obj = obj_alloc(class);
rb_iv_set(obj, "start", start);
rb_iv_set(obj, "end", end);
return obj;
}
VALUE
range_new(start, end)
VALUE start, end;
{
return Srng_new(C_Range, start, end);
}
static VALUE
Frng_match(rng, obj)
VALUE rng, obj;
{
VALUE beg, end;
beg = rb_iv_get(rng, "start");
end = rb_iv_get(rng, "end");
if (FIXNUM_P(beg) && FIXNUM_P(obj)) {
if (FIX2INT(beg) <= FIX2INT(obj) && FIX2INT(obj) <= FIX2INT(end)) {
return TRUE;
}
return FALSE;
}
else {
if (rb_funcall(beg, rb_intern("<="), 1, obj) &&
rb_funcall(end, rb_intern(">="), 1, obj)) {
return TRUE;
}
return FALSE;
}
}
struct upto_data {
VALUE beg;
VALUE end;
};
static rng_upto(data)
struct upto_data *data;
{
return rb_funcall(data->beg, rb_intern("upto"), 1, data->end);
}
static rng_upto_yield(v)
VALUE v;
{
rb_yield(v);
return Qnil;
}
static VALUE
Frng_each(obj)
VALUE obj;
{
VALUE b, e, current;
b = rb_iv_get(obj, "start");
e = rb_iv_get(obj, "end");
if (FIXNUM_P(b)) { /* fixnum is a special case(for performance) */
Fnum_upto(b, e);
}
else if (TYPE(b) == T_STRING) {
Fstr_upto(b, e);
}
else {
struct upto_data data;
data.beg = b;
data.end = e;
rb_iterate(rng_upto, &data, rng_upto_yield, Qnil);
}
return Qnil;
}
static VALUE
Frng_start(obj)
VALUE obj;
{
VALUE b;
b = rb_iv_get(obj, "start");
return b;
}
static VALUE
Frng_end(obj)
VALUE obj;
{
VALUE e;
e = rb_iv_get(obj, "end");
return e;
}
static VALUE
Frng_to_s(obj)
VALUE obj;
{
VALUE args[4];
args[0] = str_new2("%d..%d");
args[1] = rb_iv_get(obj, "start");
args[2] = rb_iv_get(obj, "end");
return Fsprintf(3, args);
}
extern VALUE M_Enumerable;
Init_Range()
{
C_Range = rb_define_class("Range", C_Object);
rb_include_module(C_Range, M_Enumerable);
rb_define_single_method(C_Range, "new", Srng_new, 2);
rb_define_method(C_Range, "=~", Frng_match, 1);
rb_define_method(C_Range, "each", Frng_each, 0);
rb_define_method(C_Range, "start", Frng_start, 0);
rb_define_method(C_Range, "end", Frng_end, 0);
rb_define_method(C_Range, "to_s", Frng_to_s, 0);
next = rb_intern("next");
}
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