From: Yusuke ENDOH <mame@...>
Date: 2008-05-31T19:10:48+09:00
Subject: [ruby-dev:34902] Suggestion: Integer#hex

遠藤です。

Integer#hex と #oct を追加するのはどうでしょうか。
String#hex たちの反転です。

   10000.hex #=> "2710"

irb を計算機代わりに使う場合に便利だと思います。
10000.to_s(16) はちょっと長すぎですし。


Index: numeric.c
===================================================================
--- numeric.c	(revision 16716)
+++ numeric.c	(working copy)
@@ -3042,6 +3042,36 @@

 /*
  *  call-seq:
+ *     int.hex    => string
+ *
+ *  Returns a string of hexadecimal digits; equivalent to int.to_s(16).
+ *
+ *     0.hex       #=> "0"
+ *     10000.hex   #=> "2710"
+ */
+static VALUE
+int_hex(VALUE num)
+{
+    return rb_funcall(num, rb_intern("to_s"), 1, INT2FIX(16));
+}
+
+/*
+ *  call-seq:
+ *     int.oct    => string
+ *
+ *  Returns a string of octal digits; equivalent to int.to_s(8).
+ *
+ *     0.oct       #=> "0"
+ *     10000.oct   #=> "23420"
+ */
+static VALUE
+int_oct(VALUE num)
+{
+    return rb_funcall(num, rb_intern("to_s"), 1, INT2FIX(8));
+}
+
+/*
+ *  call-seq:
  *     fix.zero?    => true or false
  *
  *  Returns <code>true</code> if <i>fix</i> is zero.
@@ -3163,6 +3193,8 @@
     rb_define_method(rb_cInteger, "ceil", int_to_i, 0);
     rb_define_method(rb_cInteger, "truncate", int_to_i, 0);
     rb_define_method(rb_cInteger, "round", int_round, -1);
+    rb_define_method(rb_cInteger, "hex", int_hex, 0);
+    rb_define_method(rb_cInteger, "oct", int_oct, 0);

     rb_cFixnum = rb_define_class("Fixnum", rb_cInteger);
     rb_include_module(rb_cFixnum, rb_mPrecision);
Index: test/ruby/test_integer.rb
===================================================================
--- test/ruby/test_integer.rb	(revision 16716)
+++ test/ruby/test_integer.rb	(working copy)
@@ -190,4 +190,14 @@
     assert_equal(2 ** 50, Integer(2.0 ** 50))
     assert_raise(TypeError) { Integer(nil) }
   end
+
+  def test_hex
+    assert_equal("0", 0.hex)
+    assert_equal("2710", 10000.hex)
+  end
+
+  def test_oct
+    assert_equal("0", 0.oct)
+    assert_equal("23420", 10000.oct)
+  end
 end

-- 
Yusuke ENDOH <mame@tsg.ne.jp>