From f28eef9a272fd9280416fd8c0984f616ffe102fe Mon Sep 17 00:00:00 2001
From: Jamis Buck <jamis@37signals.com>
Date: Mon, 15 Jan 2007 17:12:32 +0000
Subject: Add Object#acts_like? and Time#acts_like_time? and
 Date#acts_like_date? to facilitate duck-typing

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@5951 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
---
 activesupport/lib/active_support/core_ext/date.rb          |  2 ++
 activesupport/lib/active_support/core_ext/date/behavior.rb | 13 +++++++++++++
 activesupport/lib/active_support/core_ext/date_time.rb     |  5 +++++
 activesupport/lib/active_support/core_ext/object/misc.rb   |  9 +++++++++
 activesupport/lib/active_support/core_ext/time.rb          |  2 ++
 activesupport/lib/active_support/core_ext/time/behavior.rb | 13 +++++++++++++
 6 files changed, 44 insertions(+)
 create mode 100644 activesupport/lib/active_support/core_ext/date/behavior.rb
 create mode 100644 activesupport/lib/active_support/core_ext/date_time.rb
 create mode 100644 activesupport/lib/active_support/core_ext/time/behavior.rb

(limited to 'activesupport/lib/active_support/core_ext')

diff --git a/activesupport/lib/active_support/core_ext/date.rb b/activesupport/lib/active_support/core_ext/date.rb
index effb749c25..9d9051dfbe 100644
--- a/activesupport/lib/active_support/core_ext/date.rb
+++ b/activesupport/lib/active_support/core_ext/date.rb
@@ -1,8 +1,10 @@
 require 'date'
+require File.dirname(__FILE__) + '/date/behavior'
 require File.dirname(__FILE__) + '/date/calculations'
 require File.dirname(__FILE__) + '/date/conversions'
 
 class Date#:nodoc:
+  include ActiveSupport::CoreExtensions::Date::Behavior
   include ActiveSupport::CoreExtensions::Date::Calculations
   include ActiveSupport::CoreExtensions::Date::Conversions
 end
diff --git a/activesupport/lib/active_support/core_ext/date/behavior.rb b/activesupport/lib/active_support/core_ext/date/behavior.rb
new file mode 100644
index 0000000000..011cc17cbf
--- /dev/null
+++ b/activesupport/lib/active_support/core_ext/date/behavior.rb
@@ -0,0 +1,13 @@
+module ActiveSupport #:nodoc:
+  module CoreExtensions #:nodoc:
+    module Date #:nodoc:
+      module Behavior
+        # Enable more predictable duck-typing on Date-like classes. See
+        # Object#acts_like?.
+        def acts_like_date?
+          true
+        end
+      end
+    end
+  end
+end
diff --git a/activesupport/lib/active_support/core_ext/date_time.rb b/activesupport/lib/active_support/core_ext/date_time.rb
new file mode 100644
index 0000000000..67463d2352
--- /dev/null
+++ b/activesupport/lib/active_support/core_ext/date_time.rb
@@ -0,0 +1,5 @@
+require "#{File.dirname(__FILE__)}/time/behavior"
+
+class DateTime
+  include ActiveSupport::CoreExtensions::Time::Behavior
+end
\ No newline at end of file
diff --git a/activesupport/lib/active_support/core_ext/object/misc.rb b/activesupport/lib/active_support/core_ext/object/misc.rb
index ea8e3a1d6a..aae336e6f4 100644
--- a/activesupport/lib/active_support/core_ext/object/misc.rb
+++ b/activesupport/lib/active_support/core_ext/object/misc.rb
@@ -31,4 +31,13 @@ class Object #:nodoc:
   def to_json
     ActiveSupport::JSON.encode(self)
   end
+
+  # A duck-type assistant method. For example, ActiveSupport extends Date
+  # to define an acts_like_date? method, and extends Time to define
+  # acts_like_time?. As a result, we can do "x.acts_like?(:time)" and
+  # "x.acts_like?(:date)" to do duck-type-safe comparisons, since classes that
+  # we want to act like Time simply need to define an acts_like_time? method.
+  def acts_like?(duck)
+    respond_to? :"acts_like_#{duck}?"
+  end
 end
\ No newline at end of file
diff --git a/activesupport/lib/active_support/core_ext/time.rb b/activesupport/lib/active_support/core_ext/time.rb
index 9e3c7a0329..a802c065a7 100644
--- a/activesupport/lib/active_support/core_ext/time.rb
+++ b/activesupport/lib/active_support/core_ext/time.rb
@@ -1,7 +1,9 @@
+require File.dirname(__FILE__) + '/time/behavior'
 require File.dirname(__FILE__) + '/time/calculations'
 require File.dirname(__FILE__) + '/time/conversions'
 
 class Time#:nodoc:
+  include ActiveSupport::CoreExtensions::Time::Behavior
   include ActiveSupport::CoreExtensions::Time::Calculations
   include ActiveSupport::CoreExtensions::Time::Conversions
 end
diff --git a/activesupport/lib/active_support/core_ext/time/behavior.rb b/activesupport/lib/active_support/core_ext/time/behavior.rb
new file mode 100644
index 0000000000..a5c0baacdf
--- /dev/null
+++ b/activesupport/lib/active_support/core_ext/time/behavior.rb
@@ -0,0 +1,13 @@
+module ActiveSupport #:nodoc:
+  module CoreExtensions #:nodoc:
+    module Time #:nodoc:
+      module Behavior
+        # Enable more predictable duck-typing on Time-like classes. See
+        # Object#acts_like?.
+        def acts_like_time?
+          true
+        end
+      end
+    end
+  end
+end
-- 
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