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* object.c (sym_to_proc): new method Symbol#to_proc; backported from 1.9. bug#19012

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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@15987 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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kazu 2008-04-13 07:02:24 +00:00
parent b4c621b641
commit 7cb1d35e23
4 changed files with 42 additions and 0 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
Sun Apr 13 15:55:52 2008 Kazuhiro NISHIYAMA <zn@mbf.nifty.com>
* object.c (sym_to_proc): new method Symbol#to_proc; backported
from 1.9. bug#19012
Fri Apr 11 19:14:30 2008 Kazuhiro NISHIYAMA <zn@mbf.nifty.com>
* object.c (rb_obj_tap): new method Object#tap; backported from

4
NEWS
View file

@ -71,6 +71,10 @@ with all sufficient information, see the ChangeLog file.
New exception class that causes Kernel#loop to stop iteration when
raised.
* Symbol#to_proc
New method.
* enumerator
* Enumerator is now a built-in module. The #next and #rewind

29
object.c
View file

@ -1205,6 +1205,34 @@ sym_to_sym(sym)
return sym;
}
static VALUE
sym_call(args, mid)
VALUE args, mid;
{
VALUE obj;
if (RARRAY_LEN(args) < 1) {
rb_raise(rb_eArgError, "no receiver given");
}
obj = rb_ary_shift(args);
return rb_apply(obj, (ID)mid, args);
}
/*
* call-seq:
* sym.to_proc
*
* Returns a _Proc_ object which respond to the given method by _sym_.
*
* (1..3).collect(&:to_s) #=> ["1", "2", "3"]
*/
static VALUE
sym_to_proc(VALUE sym)
{
return rb_proc_new(sym_call, (VALUE)SYM2ID(sym));
}
/***********************************************************************
*
@ -2749,6 +2777,7 @@ Init_Object()
rb_define_method(rb_cSymbol, "to_s", sym_to_s, 0);
rb_define_method(rb_cSymbol, "id2name", sym_to_s, 0);
rb_define_method(rb_cSymbol, "to_sym", sym_to_sym, 0);
rb_define_method(rb_cSymbol, "to_proc", sym_to_proc, 0);
rb_define_method(rb_cSymbol, "===", rb_obj_equal, 1);
rb_define_method(rb_cModule, "freeze", rb_mod_freeze, 0);

4
test/ruby/test_symbol.rb
View file

@ -74,4 +74,8 @@ class TestSymbol < Test::Unit::TestCase
assert_inspect_evaled(':$0')
assert_inspect_evaled(':$1')
end
def test_to_proc
assert_equal %w(1 2 3), (1..3).map(&:to_s)
end
end