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* enum.c (enum_each_slice): Support for Enumerable#each_slice.size

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[Feature #6636]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37508 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
marcandre 2012-11-06 17:12:50 +00:00
parent c82ad6d207
commit df8451e606
2 changed files with 29 additions and 1 deletions
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22
enum.c
View file

@ -18,8 +18,12 @@
#define STATIC_ASSERT(name, expr) typedef int static_assert_##name##_check[1 - 2*!(expr)]
VALUE rb_mEnumerable;
static ID id_next;
static ID id_div;
static ID id_call;
static ID id_size;
#define id_each idEach
#define id_eqq idEqq
#define id_cmp idCmp
@ -1778,6 +1782,20 @@ each_slice_i(VALUE i, VALUE m, int argc, VALUE *argv)
return v;
}
static VALUE
enum_each_slice_size(VALUE obj, VALUE args)
{
VALUE n, size;
long slice_size = NUM2LONG(RARRAY_PTR(args)[0]);
if (slice_size <= 0) rb_raise(rb_eArgError, "invalid slice size");
size = enum_size(obj, 0);
if (size == Qnil) return Qnil;
n = rb_funcall(size, '+', 1, LONG2NUM(slice_size-1));
return rb_funcall(n, id_div, 1, LONG2FIX(slice_size));
}
/*
* call-seq:
* enum.each_slice(n) { ... } -> nil
@ -1802,7 +1820,7 @@ enum_each_slice(VALUE obj, VALUE n)
NODE *memo;
if (size <= 0) rb_raise(rb_eArgError, "invalid slice size");
RETURN_ENUMERATOR(obj, 1, &n);
RETURN_SIZED_ENUMERATOR(obj, 1, &n, enum_each_slice_size);
ary = rb_ary_new2(size);
memo = NEW_MEMO(ary, 0, size);
rb_block_call(obj, id_each, 0, 0, each_slice_i, (VALUE)memo);
@ -2743,4 +2761,6 @@ Init_Enumerable(void)
id_next = rb_intern("next");
id_call = rb_intern("call");
id_size = rb_intern("size");
id_div = rb_intern("div");
}

8
test/ruby/test_enumerator.rb
View file

@ -482,5 +482,13 @@ class TestEnumerator < Test::Unit::TestCase
def test_size_for_loops
assert_equal Float::INFINITY, loop.size
end
def test_size_for_each_slice
assert_equal nil, @obj.each_slice(3).size
assert_equal 6, @sized.each_slice(7).size
assert_equal 5, @sized.each_slice(10).size
assert_equal 1, @sized.each_slice(70).size
assert_raise(ArgumentError){ @obj.each_slice(0).size }
end
end