* array.c (take_items), enum.c (enum_zip): tries to convert to

  array first.  [ruby-core:21442]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@21678 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Tue Jan 20 06:48:56 2009  Nobuyoshi Nakada  <[email protected]>
+
+	* array.c (take_items), enum.c (enum_zip): tries to convert to
+	  array first.  [ruby-core:21442]
+
 Tue Jan 20 03:50:37 2009  NARUSE, Yui  <[email protected]>
 
 	* ext/nkf/nkf-utf8/nkf.c: Update nkf to 2.0.9.

array.c

@@ -2209,9 +2209,11 @@ take_i(VALUE val, VALUE *args, int argc, VALUE *argv)
 static VALUE
 take_items(VALUE obj, long n)
 {
-    VALUE result = rb_ary_new2(n);
+    VALUE result = to_ary(obj);
     VALUE args[2];
 
+    if (!NIL_P(result)) return rb_ary_subseq(result, 0, n);
+    result = rb_ary_new2(n);
     args[0] = result; args[1] = (VALUE)n;
     rb_block_call(obj, rb_intern("each"), 0, 0, take_i, (VALUE)args);
     return result;

enum.c

@@ -1558,13 +1558,17 @@ enum_zip(int argc, VALUE *argv, VALUE obj)
     ID conv;
     NODE *memo;
     VALUE result = Qnil;
+    VALUE args = rb_ary_new4(argc, argv);
     int allary = Qtrue;
 
+    argv = RARRAY_PTR(args);
     for (i=0; i<argc; i++) {
-	if (TYPE(argv[i]) != T_ARRAY) {
+	VALUE ary = rb_check_array_type(argv[i]);
+	if (NIL_P(ary)) {
 	    allary = Qfalse;
 	    break;
 	}
+	argv[i] = ary;
     }
     if (!allary) {
 	CONST_ID(conv, "to_enum");
@@ -1576,7 +1580,7 @@ enum_zip(int argc, VALUE *argv, VALUE obj)
 	result = rb_ary_new();
     }
     /* use NODE_DOT2 as memo(v, v, -) */
-    memo = rb_node_newnode(NODE_DOT2, result, rb_ary_new4(argc, argv), 0);
+    memo = rb_node_newnode(NODE_DOT2, result, args, 0);
     rb_block_call(obj, id_each, 0, 0, allary ? zip_ary : zip_i, (VALUE)memo);
 
     return result;

test/ruby/test_array.rb

@@ -1502,6 +1502,11 @@ def test_zip
     a = []
     [1, 2, 3].zip([:a, :b], ["a", "b", "c", "d"]) {|x| a << x }
     assert_equal([[1, :a, "a"], [2, :b, "b"], [3, nil, "c"]], a)
+
+    ary = Object.new
+    def ary.to_a;   [1, 2]; end
+    def ary.to_ary; [3, 4]; end
+    assert_equal([[5, 3], [6, 4]], [5, 6].zip(ary))
   end
 
   def test_transpose

test/ruby/test_enum.rb

@@ -211,6 +211,11 @@ def test_zip
     a = []
     @obj.zip([:a, :b, :c]) {|x,y| a << [x, y] }
     assert_equal([[1,:a],[2,:b],[3,:c],[1,nil],[2,nil]], a)
+
+    ary = Object.new
+    def ary.to_a;   [1, 2]; end
+    def ary.to_ary; [3, 4]; end
+    assert_equal([[1, 3], [2, 4], [3, nil], [1, nil], [2, nil]], @obj.zip(ary))
   end
 
   def test_take