From d34d8565d2ca1f667485bd389277ac676bd248e7 Mon Sep 17 00:00:00 2001
From: Markus Schirp <mbj@seonic.net>
Date: Sun, 13 Jan 2013 22:25:49 +0100
Subject: [PATCH] Add method specific subject subclass

---
 lib/mutant.rb                |  1 +
 lib/mutant/subject.rb        | 30 ++++++-------
 lib/mutant/subject/method.rb | 82 ++++++++++++++++++++++++++++++++++++
 3 files changed, 98 insertions(+), 15 deletions(-)
 create mode 100644 lib/mutant/subject/method.rb

diff --git a/lib/mutant.rb b/lib/mutant.rb
index b64121e7..5e9a0e24 100644
--- a/lib/mutant.rb
+++ b/lib/mutant.rb
@@ -84,6 +84,7 @@ require 'mutant/loader'
 require 'mutant/context'
 require 'mutant/context/scope'
 require 'mutant/subject'
+require 'mutant/subject/method'
 require 'mutant/matcher'
 require 'mutant/matcher/chain'
 require 'mutant/matcher/object_space'
diff --git a/lib/mutant/subject.rb b/lib/mutant/subject.rb
index 95a5286b..71c5762d 100644
--- a/lib/mutant/subject.rb
+++ b/lib/mutant/subject.rb
@@ -1,7 +1,7 @@
 module Mutant
   # Subject of a mutation
   class Subject
-    include Adamantium::Flat, Enumerable, Equalizer.new(:context, :matcher, :node)
+    include AbstractType, Adamantium::Flat, Enumerable, Equalizer.new(:context, :node)
 
     # Return context
     #
@@ -11,14 +11,6 @@ module Mutant
     #
     attr_reader :context
 
-    # Return matcher
-    #
-    # @return [Matcher]
-    #
-    # @api private
-    #
-    attr_reader :matcher
-
     # Return AST node
     #
     # @return [Rubinius::AST::Node]
@@ -84,7 +76,7 @@ module Mutant
     # @api private
     #
     def identification
-      "#{matcher.identification}:#{source_path}:#{source_line}"
+      "#{context.identitfication}#{subtype}:#{source_path}:#{source_line}"
     end
     memoize :identification
 
@@ -126,19 +118,27 @@ module Mutant
 
     # Initialize subject
     #
-    # @param [Matcher] matcher
-    #   the context of mutations
+    # @param [Mutant::Context] context
     #
     # @param [Rubinius::AST::Node] node
-    #   the node to be mutated
+    #   the original node to be mutated
     #
     # @return [unkown]
     #
     # @api private
     #
-    def initialize(matcher, context, node)
-      @matcher, @context, @node = matcher, context, node
+    def initialize(context, node)
+      @context, @node = context, node
     end
 
+    # Return subtype identifier
+    #
+    # @return [String]
+    #
+    # @api private
+    #
+    abstract_method :subtype
+    private :subtype
+
   end
 end
diff --git a/lib/mutant/subject/method.rb b/lib/mutant/subject/method.rb
new file mode 100644
index 00000000..f82abc46
--- /dev/null
+++ b/lib/mutant/subject/method.rb
@@ -0,0 +1,82 @@
+module Mutant
+  class Subject
+    # Abstract base class for method subjects
+    class Method < self
+
+      # Test if method is public
+      #
+      # @return [true]
+      #   if method is public
+      #
+      # @return [false]
+      #   otherwise
+      #
+      # @api private
+      #
+      abstract_method :public?
+
+      # Instance method subjects
+      class Instance < self
+
+        # Test if method is public
+        #
+        # @return [true]
+        #   if method is public
+        #
+        # @return [false]
+        #   otherwise
+        #
+        # @api private
+        #
+        def public?
+          scope.public_method_defined?(method_name)
+        end
+        memoize :public?
+
+      private
+
+        # Return subtype identifier
+        #
+        # @return [String]
+        #
+        # @api private
+        #
+        def subtype
+          "#{context.name}##{node.name}"
+        end
+
+      end
+
+      # Singleton method subjects
+      class Singleton < self 
+
+        # Test if method is public
+        #
+        # @return [true]
+        #   if method is public
+        #
+        # @return [false]
+        #   otherwise
+        #
+        # @api private
+        #
+        def public?
+          scope.singleton_class.public_method_defined?(method_name)
+        end
+        memoize :public?
+
+      private
+
+        # Return subtype identifier
+        #
+        # @return [String]
+        #
+        # @api private
+        #
+        def subtype
+          "#{context.name}.#{node.name}"
+        end
+      end
+    end
+  end
+end