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* enumerator.c: Support for lazy.size

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[Feature #6636]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37521 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
marcandre 2012-11-06 17:15:59 +00:00
parent 4437403426
commit c8426ce840
2 changed files with 27 additions and 2 deletions
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23
enumerator.c
View file

@ -104,7 +104,7 @@
*/
VALUE rb_cEnumerator;
VALUE rb_cLazy;
static ID id_rewind, id_each, id_new, id_initialize, id_yield, id_call;
static ID id_rewind, id_each, id_new, id_initialize, id_yield, id_call, id_size;
static ID id_eqq, id_next, id_result, id_lazy, id_receiver, id_arguments, id_method;
static VALUE sym_each, sym_cycle;
@ -1239,6 +1239,23 @@ generator_each(int argc, VALUE *argv, VALUE obj)
}
/* Lazy Enumerator methods */
static VALUE
lazy_receiver_size(VALUE self)
{
VALUE r = rb_check_funcall(rb_ivar_get(self, id_receiver), id_size, 0, 0);
return (r == Qundef) ? Qnil : r;
}
static VALUE
lazy_size(VALUE self)
{
struct enumerator *e = enumerator_ptr(self);
if (e->size_fn) {
return (*e->size_fn)(self);
}
return Qnil;
}
static VALUE
lazy_init_iterator(VALUE val, VALUE m, int argc, VALUE *argv)
{
@ -1313,7 +1330,7 @@ lazy_initialize(int argc, VALUE *argv, VALUE self)
rb_block_call(generator, id_initialize, 0, 0,
(rb_block_given_p() ? lazy_init_block_i : lazy_init_block),
obj);
enumerator_init(self, generator, meth, argc - offset, argv + offset, 0, Qnil);
enumerator_init(self, generator, meth, argc - offset, argv + offset, lazy_receiver_size, Qnil);
rb_ivar_set(self, id_receiver, obj);
return self;
@ -1820,6 +1837,7 @@ InitVM_Enumerator(void)
rb_define_method(rb_cLazy, "flat_map", lazy_flat_map, 0);
rb_define_method(rb_cLazy, "collect_concat", lazy_flat_map, 0);
rb_define_method(rb_cLazy, "select", lazy_select, 0);
rb_define_method(rb_cLazy, "size", lazy_size, 0);
rb_define_method(rb_cLazy, "find_all", lazy_select, 0);
rb_define_method(rb_cLazy, "reject", lazy_reject, 0);
rb_define_method(rb_cLazy, "grep", lazy_grep, 1);
@ -1860,6 +1878,7 @@ Init_Enumerator(void)
id_rewind = rb_intern("rewind");
id_each = rb_intern("each");
id_call = rb_intern("call");
id_size = rb_intern("size");
id_yield = rb_intern("yield");
id_new = rb_intern("new");
id_initialize = rb_intern("initialize");

6
test/ruby/test_lazy_enumerator.rb
View file

@ -323,4 +323,10 @@ class TestLazyEnumerator < Test::Unit::TestCase
#<Enumerator::Lazy: #<Enumerator::Lazy: #<Enumerator::Lazy: #<Enumerator::Lazy: #<Enumerator::Lazy: #<Enumerator::Lazy: #<Enumerator::Lazy: #<Enumerator::Lazy: #<Enumerator::Lazy: #<Enumerator::Lazy: #<Enumerator::Lazy: #<Enumerator::Lazy: #<Enumerator::Lazy: #<Enumerator::Lazy: #<Enumerator::Lazy: 1..10>:map>:collect>:flat_map>:collect_concat>:select>:find_all>:reject>:grep(1)>:zip("a".."c")>:take(10)>:take_while>:drop(3)>:drop_while>:cycle(3)>
EOS
end
def test_size
lazy = [1, 2, 3].lazy
assert_equal 3, lazy.size
assert_equal 42, Enumerator.new(42){}.lazy.size
end
end