diff options
Diffstat (limited to 'enumerator.c')
| -rw-r--r-- | enumerator.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/enumerator.c b/enumerator.c index c1a553a705..9e3da15dd3 100644 --- a/enumerator.c +++ b/enumerator.c @@ -1272,6 +1272,32 @@ lazy_map(VALUE obj) return rb_block_call(rb_cLazy, id_new, 1, &obj, lazy_map_func, 0); } +static VALUE +lazy_flat_map_func(VALUE val, VALUE m, int argc, VALUE *argv) +{ + VALUE result = rb_yield_values2(argc - 1, &argv[1]); + VALUE ary = rb_check_array_type(result); + if (NIL_P(ary)) { + return rb_funcall(argv[0], id_yield, 1, result); + } + else { + int i; + for (i = 0; i < RARRAY_LEN(ary); i++) { + rb_funcall(argv[0], id_yield, 1, RARRAY_PTR(ary)[i]); + } + return Qnil; + } +} + +static VALUE +lazy_flat_map(VALUE obj) +{ + if (!rb_block_given_p()) { + rb_raise(rb_eArgError, "tried to call lazy flat_map without a block"); + } + + return rb_block_call(rb_cLazy, id_new, 1, &obj, lazy_flat_map_func, 0); +} static VALUE lazy_select_func(VALUE val, VALUE m, int argc, VALUE *argv) @@ -1377,11 +1403,13 @@ Init_Enumerator(void) rb_define_method(rb_mEnumerable, "lazy", enumerable_lazy, 0); rb_define_method(rb_cLazy, "initialize", lazy_initialize, 1); rb_define_method(rb_cLazy, "map", lazy_map, 0); + rb_define_method(rb_cLazy, "flat_map", lazy_flat_map, 0); rb_define_method(rb_cLazy, "select", lazy_select, 0); rb_define_method(rb_cLazy, "reject", lazy_reject, 0); rb_define_method(rb_cLazy, "grep", lazy_grep, 1); rb_define_alias(rb_cLazy, "collect", "map"); + rb_define_alias(rb_cLazy, "collect_concat", "flat_map"); rb_define_alias(rb_cLazy, "find_all", "select"); rb_eStopIteration = rb_define_class("StopIteration", rb_eIndexError); |