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* enumerator.c: Optimize Lazy#zip when passed only arrays

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[Bug #7706]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38925 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
marcandre 2013-01-24 07:05:42 +00:00
parent cc6e6de22f
commit 1af390b1ea
3 changed files with 54 additions and 3 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
Thu Jan 24 16:05:08 2013 Marc-Andre Lafortune <ruby-core@marc-andre.ca>
* enumerator.c: Optimize Lazy#zip when passed only arrays
[Bug #7706]
Thu Jan 24 15:21:17 2013 Marc-Andre Lafortune <ruby-core@marc-andre.ca>
* enumerator.c: Fix state handling for Lazy#zip,{drop_take}{_while}

38
enumerator.c
View file

@ -1601,6 +1601,26 @@ next_stopped(VALUE obj)
return Qnil;
}
static VALUE
lazy_zip_arrays_func(VALUE val, VALUE arrays, int argc, VALUE *argv)
{
VALUE yielder, ary, memo;
long i, count;
yielder = argv[0];
memo = rb_ivar_get(yielder, id_memo);
count = NIL_P(memo) ? 0 : NUM2LONG(memo);
ary = rb_ary_new2(RARRAY_LEN(arrays) + 1);
rb_ary_push(ary, argv[1]);
for (i = 0; i < RARRAY_LEN(arrays); i++) {
rb_ary_push(ary, rb_ary_entry(RARRAY_PTR(arrays)[i], count));
}
rb_funcall(yielder, id_yield, 1, ary);
rb_ivar_set(yielder, id_memo, LONG2NUM(++count));
return Qnil;
}
static VALUE
lazy_zip_func(VALUE val, VALUE zip_args, int argc, VALUE *argv)
{
@ -1631,15 +1651,27 @@ lazy_zip_func(VALUE val, VALUE zip_args, int argc, VALUE *argv)
static VALUE
lazy_zip(int argc, VALUE *argv, VALUE obj)
{
VALUE ary;
VALUE ary, v;
long i;
rb_block_call_func *func = lazy_zip_arrays_func;
if (rb_block_given_p()) {
return rb_call_super(argc, argv);
}
ary = rb_ary_new4(argc, argv);
ary = rb_ary_new2(argc);
for (i = 0; i < argc; i++) {
v = rb_check_array_type(argv[i]);
if (NIL_P(v)) {
ary = rb_ary_new4(argc, argv);
func = lazy_zip_func;
break;
}
rb_ary_push(ary, v);
}
return lazy_set_method(rb_block_call(rb_cLazy, id_new, 1, &obj,
lazy_zip_func, ary),
func, ary),
ary, lazy_receiver_size);
}

14
test/ruby/test_lazy_enumerator.rb
View file

@ -272,6 +272,20 @@ class TestLazyEnumerator < Test::Unit::TestCase
assert_equal([[1, 'a', 'a'], [2, 'b', 'b'], [3, 'c', 'c']]*3, zip.flat_map{zip}.force, bug7696)
end
def test_zip_lazy_on_args
zip = Step.new(1..2).lazy.zip(42..Float::INFINITY)
assert_equal [[1, 42], [2, 43]], zip.force
end
def test_zip_efficient_on_array_args
ary = [42, :foo]
%i[to_enum enum_for lazy each].each do |forbid|
ary.define_singleton_method(forbid){ fail "#{forbid} was called"}
end
zip = Step.new(1..2).lazy.zip(ary)
assert_equal [[1, 42], [2, :foo]], zip.force
end
def test_take_rewound
bug7696 = '[ruby-core:51470]'
e=(1..42).lazy.take(2)