ruby-dev

前田です。

In message "[ruby-list:6423] Re: rgrep (Re: call for scripts)"
Yukihiro Matsumoto <matz@netlab.co.jp> wrote:

|イテレータブロックをそのまま引き渡す
|
|  {|x| yield x}
|
|の代わりになる記号があれば良いのだろうと思うのですが，なかな
|か良いのが思い付きません．
|
|  foreach_files(path) xxx
|
|のxxxの部分に来るいかにもそれらしいもの(出来れば予約語でない
|方が望ましいが，予約語でも良い)が，あれば良いのですが…．

なかなか良い記号や名前はなさそうですね。

文法拡張はせずに、

obj.pass_block(:itername, args...)

というメソッドを用意する、というのはどうでしょう。


-- 
前田 修吾

Attachments (1)

eval.c.diff (1.12 KB, text/x-diff)

--- eval.c.orig	Mon Feb 16 12:18:24 1998
+++ eval.c	Mon Feb 16 12:29:27 1998
@@ -3396,6 +3396,35 @@
     return vid;
 }
 
+static VALUE
+f_pass_block(argc, argv, recv)
+    int argc;
+    VALUE *argv;
+    VALUE recv;
+{
+    VALUE vid;
+    ID mid;
+
+    if (argc == 0) ArgError("no iterator name given");
+    if (iterator_p())
+	ArgError("iterator block given to pass_block");
+    if (!f_iterator_p())
+	ArgError("pass_block called out of iterator");
+
+    vid = argv[0]; argc--; argv++;
+    if (TYPE(vid) == T_STRING) {
+	mid = rb_intern(RSTRING(vid)->ptr);
+    }
+    else {
+	mid = NUM2INT(vid);
+    }
+    PUSH_ITER(ITER_PRE);
+    vid = rb_call(CLASS_OF(recv), recv, mid, argc, argv, 1);
+    POP_ITER();
+
+    return vid;
+}
+
 #include <varargs.h>
 
 VALUE
@@ -4248,6 +4277,7 @@
     rb_define_global_function("global_variables", f_global_variables, 0);
 
     rb_define_method(mKernel, "send", f_send, -1);
+    rb_define_method(mKernel, "pass_block", f_pass_block, -1);
     rb_define_method(mKernel, "instance_eval", obj_instance_eval, 1);
 
     rb_define_private_method(cModule, "append_features", mod_append_features, 1);

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[ruby-dev:1463] iterator block passing (Re: rgrep)

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