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enumerator.c: lazy_grep_v

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* enumerator.c (lazy_grep_v): add Enumerator::Lazy#grep_v as well
  as Enumerable, to enumerate lazily.
  [ruby-core:71845] [Feature #11773]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52943 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2015-12-08 07:23:43 +00:00
parent 506b25aabf
commit 7d0b7fb4cf
3 changed files with 70 additions and 1 deletions
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37
enumerator.c
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@ -1423,7 +1423,7 @@ lazy_set_method(VALUE lazy, VALUE args, rb_enumerator_size_func *size_fn)
* e.lazy -> lazy_enumerator
*
* Returns a lazy enumerator, whose methods map/collect,
* flat_map/collect_concat, select/find_all, reject, grep, zip, take,
* flat_map/collect_concat, select/find_all, reject, grep, grep_v, zip, take,
* take_while, drop, and drop_while enumerate values only on an
* as-needed basis. However, if a block is given to zip, values
* are enumerated immediately.
@ -1690,6 +1690,40 @@ lazy_grep(VALUE obj, VALUE pattern)
rb_ary_new3(1, pattern), 0);
}
static VALUE
lazy_grep_v_func(RB_BLOCK_CALL_FUNC_ARGLIST(val, m))
{
VALUE i = rb_enum_values_pack(argc - 1, argv + 1);
VALUE result = rb_funcall(m, id_eqq, 1, i);
if (!RTEST(result)) {
rb_funcall(argv[0], id_yield, 1, i);
}
return Qnil;
}
static VALUE
lazy_grep_v_iter(RB_BLOCK_CALL_FUNC_ARGLIST(val, m))
{
VALUE i = rb_enum_values_pack(argc - 1, argv + 1);
VALUE result = rb_funcall(m, id_eqq, 1, i);
if (!RTEST(result)) {
rb_funcall(argv[0], id_yield, 1, rb_yield(i));
}
return Qnil;
}
static VALUE
lazy_grep_v(VALUE obj, VALUE pattern)
{
return lazy_set_method(rb_block_call(rb_cLazy, id_new, 1, &obj,
rb_block_given_p() ?
lazy_grep_v_iter : lazy_grep_v_func,
pattern),
rb_ary_new3(1, pattern), 0);
}
static VALUE
call_next(VALUE obj)
{
@ -2029,6 +2063,7 @@ InitVM_Enumerator(void)
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);
rb_define_method(rb_cLazy, "grep_v", lazy_grep_v, 1);
rb_define_method(rb_cLazy, "zip", lazy_zip, -1);
rb_define_method(rb_cLazy, "take", lazy_take, 1);
rb_define_method(rb_cLazy, "take_while", lazy_take_while, 0);