From 81c0fda8ecdd6dd4eab8ed64c968d841617df333 Mon Sep 17 00:00:00 2001
From: skandhas <skandhas@163.com>
Date: Tue, 8 Oct 2013 21:47:11 +0800
Subject: add some methods to Symbol

---
 mrbgems/mruby-symbol-ext/mrblib/symbol.rb | 51 +++++++++++++++++++++++++++++++
 mrbgems/mruby-symbol-ext/test/symbol.rb   | 22 +++++++++++++
 2 files changed, 73 insertions(+)

diff --git a/mrbgems/mruby-symbol-ext/mrblib/symbol.rb b/mrbgems/mruby-symbol-ext/mrblib/symbol.rb
index f716162e8..a4e8ef7a8 100644
--- a/mrbgems/mruby-symbol-ext/mrblib/symbol.rb
+++ b/mrbgems/mruby-symbol-ext/mrblib/symbol.rb
@@ -6,4 +6,55 @@ class Symbol
     end
   end
 
+  ##
+  # call-seq:
+  #   sym.length    -> integer
+  #
+  # Same as <code>sym.to_s.length</code>.
+
+  def length
+    self.to_s.length
+  end
+  alias :size :length
+
+  ##
+  # call-seq:
+  #   sym.capitalize  -> symbol
+  #
+  # Same as <code>sym.to_s.capitalize.intern</code>.
+
+  def capitalize
+    self.to_s.capitalize.intern
+  end
+
+  ##
+  # call-seq:
+  #   sym.downcase  -> symbol
+  #
+  # Same as <code>sym.to_s.downcase.intern</code>.
+
+  def downcase
+    self.to_s.downcase.intern
+  end
+
+  ##
+  # call-seq:
+  #   sym.upcase    -> symbol
+  #
+  # Same as <code>sym.to_s.upcase.intern</code>.
+
+  def upcase
+    self.to_s.upcase.intern
+  end
+
+  #
+  # call-seq:
+  #   sym.empty?   -> true or false
+  #
+  # Returns that _sym_ is :"" or not.
+
+  def empty?
+    self.to_s.empty?
+  end
+
 end
diff --git a/mrbgems/mruby-symbol-ext/test/symbol.rb b/mrbgems/mruby-symbol-ext/test/symbol.rb
index 741315d74..35bb31aef 100644
--- a/mrbgems/mruby-symbol-ext/test/symbol.rb
+++ b/mrbgems/mruby-symbol-ext/test/symbol.rb
@@ -10,3 +10,25 @@ assert('Symbol.all_symbols') do
   symbols = Symbol.all_symbols.select{|sym|sym.to_s.include? '__symbol_test'}.sort
   assert_equal foo, symbols
 end
+
+assert("Symbol#length") do
+  assert_equal 5, :hello.size
+  assert_equal 5, :mruby.length
+end
+
+assert("Symbol#capitalize") do
+  assert_equal :Hello, :hello.capitalize
+  assert_equal :Hello, :HELLO.capitalize
+end
+
+assert("Symbol#downcase") do
+  assert_equal :hello, :hEllO.downcase
+end
+
+assert("Symbol#upcase") do
+  assert_equal :HELLO, :hEllO.upcase
+end
+
+assert("Symbol#empty?") do
+  assert_true :''.empty?
+end
-- 
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