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/************************************************
range.c -
$Author: matz $
$Date: 1994/06/17 14:23:50 $
created at: Thu Aug 19 17:46:47 JST 1993
Copyright (C) 1994 Yukihiro Matsumoto
************************************************/
#include "ruby.h"
VALUE M_Comparable;
VALUE C_Range;
static ID next, eq;
VALUE
range_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;
}
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;
}
}
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) */
int beg, end, i;
beg = FIX2INT(b);
end = FIX2INT(e);
for (i=beg; i<=end; i++) {
rb_yield(INT2FIX(i));
}
}
else {
GC_LINK;
GC_PRO3(current, b);
for (;;) {
rb_yield(current);
if (rb_funcall(current, eq, 1, e)) break;
current = rb_funcall(current, next, 0);
}
GC_UNLINK;
}
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;
{
int beg, end;
VALUE fmt, str, args[4];
beg = rb_iv_get(obj, "start");
end = rb_iv_get(obj, "end");
GC_LINK;
GC_PRO3(fmt, str_new2("%d..%d"));
args[0] = obj; args[1] = fmt; args[2]= beg; args[3] = end;
str = Fsprintf(4, args);
GC_UNLINK;
return str;
}
extern VALUE M_Enumerable;
Init_Range()
{
C_Range = rb_define_class("Range", C_Object);
rb_include_module(C_Range, M_Enumerable);
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);
eq = rb_intern("==");
next = rb_intern("next");
}
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