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-rw-r--r--enumerator.c37
1 files changed, 36 insertions, 1 deletions
diff --git a/enumerator.c b/enumerator.c
index 092e950ec52..141496112f9 100644
--- a/enumerator.c
+++ b/enumerator.c
@@ -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.
@@ -1691,6 +1691,40 @@ lazy_grep(VALUE obj, VALUE pattern)
}
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)
{
return rb_funcall(obj, id_next, 0);
@@ -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);