[Sass] Add some piping that'll allow Sass::Script::Node to have access to options.

lib/sass/script/funcall.rb

@@ -46,6 +46,14 @@ module Sass
         raise e unless e.backtrace.any? {|t| t =~ /:in `(block in )?(#{name}|perform)'$/}
         raise Sass::SyntaxError.new("#{e.message} for `#{name}'")
       end
+
+      # Returns the arguments to the function.
+      #
+      # @return [Array<Node>]
+      # @see Node#children
+      def children
+        @args
+      end
     end
   end
 end

lib/sass/script/literal.rb

@@ -31,6 +31,14 @@ module Sass::Script
       self
     end
 
+    # Returns an empty array.
+    #
+    # @return [Array<Node>] empty
+    # @see Node#children
+    def children
+      []
+    end
+
     # The SassScript `and` operation.
     #
     # @param other [Literal] The right-hand side of the operator

lib/sass/script/node.rb

@@ -3,6 +3,21 @@ module Sass::Script
   #
   # Use \{#perform} to evaluate a parse tree.
   class Node
+    # The options hash for this node.
+    #
+    # @return [{Symbol => Object}]
+    attr_reader :options
+
+    # Sets the options hash for this node,
+    # as well as for all child nodes.
+    # See {file:SASS_REFERENCE.md#sass_options the Sass options documentation}.
+    #
+    # @param options [{Symbol => Object}] The options
+    def options=(options)
+      @options = options
+      children.each {|c| c.options = options}
+    end
+
     # Evaluates the node.
     #
     # @param environment [Sass::Environment] The environment in which to evaluate the SassScript
@@ -10,5 +25,12 @@ module Sass::Script
     def perform(environment)
       raise NotImplementedError.new("All subclasses of Sass::Script::Node must override #perform.")
     end
+
+    # Returns all child nodes of this node.
+    #
+    # @return [Array<Node>]
+    def children
+      raise NotImplementedError.new("All subclasses of Sass::Script::Node must override #children.")
+    end
   end
 end

lib/sass/script/operation.rb

@@ -41,5 +41,13 @@ module Sass::Script
         raise Sass::SyntaxError.new("Undefined operation: \"#{literal1} #{@operator} #{literal2}\".")
       end
     end
+
+    # Returns the operands for this operation.
+    #
+    # @return [Array<Node>]
+    # @see Node#children
+    def children
+      [@operand1, @operand2]
+    end
   end
 end

lib/sass/script/unary_operation.rb

@@ -30,5 +30,13 @@ module Sass::Script
       raise e unless e.name.to_s == operator.to_s
       raise Sass::SyntaxError.new("Undefined unary operation: \"#{@operator} #{literal}\".")
     end
+
+    # Returns the operand of the operation.
+    #
+    # @return [Array<Node>]
+    # @see Node#children
+    def children
+      [@operand]
+    end
   end
 end

lib/sass/script/variable.rb

@@ -26,6 +26,14 @@ module Sass
         (val = environment.var(name)) && (return val)
         raise SyntaxError.new("Undefined variable: \"!#{name}\".")
       end
+
+      # Returns an empty array.
+      #
+      # @return [Array<Node>] empty
+      # @see Node#children
+      def children
+        []
+      end
     end
   end
 end