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#include <mruby.h>
#include <mruby/range.h>
#include <math.h>
static mrb_bool
r_le(mrb_state *mrb, mrb_value a, mrb_value b)
{
mrb_value r = mrb_funcall(mrb, a, "<=>", 1, b); /* compare result */
/* output :a < b => -1, a = b => 0, a > b => +1 */
if (mrb_fixnum_p(r)) {
mrb_int c = mrb_fixnum(r);
if (c == 0 || c == -1) return TRUE;
}
return FALSE;
}
static mrb_bool
r_lt(mrb_state *mrb, mrb_value a, mrb_value b)
{
mrb_value r = mrb_funcall(mrb, a, "<=>", 1, b);
/* output :a < b => -1, a = b => 0, a > b => +1 */
return mrb_fixnum_p(r) && mrb_fixnum(r) == -1;
}
/*
* call-seq:
* rng.cover?(obj) -> true or false
*
* Returns <code>true</code> if +obj+ is between the begin and end of
* the range.
*
* This tests <code>begin <= obj <= end</code> when #exclude_end? is +false+
* and <code>begin <= obj < end</code> when #exclude_end? is +true+.
*
* ("a".."z").cover?("c") #=> true
* ("a".."z").cover?("5") #=> false
* ("a".."z").cover?("cc") #=> true
*/
static mrb_value
mrb_range_cover(mrb_state *mrb, mrb_value range)
{
mrb_value val;
struct RRange *r = mrb_range_ptr(mrb, range);
mrb_value beg, end;
mrb_get_args(mrb, "o", &val);
beg = r->edges->beg;
end = r->edges->end;
if (r_le(mrb, beg, val)) {
if (r->excl) {
if (r_lt(mrb, val, end))
return mrb_true_value();
}
else {
if (r_le(mrb, val, end))
return mrb_true_value();
}
}
return mrb_false_value();
}
/*
* call-seq:
* rng.last -> obj
* rng.last(n) -> an_array
*
* Returns the last object in the range,
* or an array of the last +n+ elements.
*
* Note that with no arguments +last+ will return the object that defines
* the end of the range even if #exclude_end? is +true+.
*
* (10..20).last #=> 20
* (10...20).last #=> 20
* (10..20).last(3) #=> [18, 19, 20]
* (10...20).last(3) #=> [17, 18, 19]
*/
static mrb_value
mrb_range_last(mrb_state *mrb, mrb_value range)
{
mrb_value num;
mrb_value array;
struct RRange *r = mrb_range_ptr(mrb, range);
if (mrb_get_args(mrb, "|o", &num) == 0) {
return r->edges->end;
}
array = mrb_funcall(mrb, range, "to_a", 0);
return mrb_funcall(mrb, array, "last", 1, mrb_to_int(mrb, num));
}
/*
* call-seq:
* rng.size -> num
*
* Returns the number of elements in the range. Both the begin and the end of
* the Range must be Numeric, otherwise nil is returned.
*
* (10..20).size #=> 11
* ('a'..'z').size #=> nil
*/
static mrb_value
mrb_range_size(mrb_state *mrb, mrb_value range)
{
struct RRange *r = mrb_range_ptr(mrb, range);
mrb_value beg, end;
mrb_float beg_f, end_f;
mrb_bool num_p = TRUE;
mrb_bool excl;
beg = r->edges->beg;
end = r->edges->end;
excl = r->excl;
if (mrb_fixnum_p(beg)) {
beg_f = (mrb_float)mrb_fixnum(beg);
}
else if (mrb_float_p(beg)) {
beg_f = mrb_float(beg);
}
else {
num_p = FALSE;
}
if (mrb_fixnum_p(end)) {
end_f = (mrb_float)mrb_fixnum(end);
}
else if (mrb_float_p(end)) {
end_f = mrb_float(end);
}
else {
num_p = FALSE;
}
if (num_p) {
mrb_float n = end_f - beg_f;
mrb_float err = (fabs(beg_f) + fabs(end_f) + fabs(end_f-beg_f)) * MRB_FLOAT_EPSILON;
if (err>0.5) err=0.5;
if (excl) {
if (n<=0) return mrb_fixnum_value(0);
if (n<1)
n = 0;
else
n = floor(n - err);
}
else {
if (n<0) return mrb_fixnum_value(0);
n = floor(n + err);
}
if (isinf(n+1))
return mrb_float_value(mrb, INFINITY);
return mrb_fixnum_value((mrb_int)n+1);
}
return mrb_nil_value();
}
void
mrb_mruby_range_ext_gem_init(mrb_state* mrb)
{
struct RClass * s = mrb_class_get(mrb, "Range");
mrb_define_method(mrb, s, "cover?", mrb_range_cover, MRB_ARGS_REQ(1));
mrb_define_method(mrb, s, "last", mrb_range_last, MRB_ARGS_OPT(1));
mrb_define_method(mrb, s, "size", mrb_range_size, MRB_ARGS_NONE());
}
void
mrb_mruby_range_ext_gem_final(mrb_state* mrb)
{
}
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