Sass extensions for emitting Sass text from a Sass::Tree

doc-src/lib/stylesheets.rb

@@ -49,17 +49,7 @@ def mixins(item)
 end
 
 def mixin_signature(mixin)
-  signature = "+#{mixin.name}"
+  mixin.sass_signature(:include)
-  if mixin.args && mixin.args.any?
-    signature << "("
-    signature << mixin.args.map do |a|
-      var = a.first
-      default_value = a.last
-      "#{var.inspect}#{" = " + default_value.inspect if default_value}"
-    end.join(", ")
-    signature << ")"
-  end
-  signature
 end
 
 def format_doc(docstring)

doc-src/lib/stylesheets/sass_extensions.rb

@@ -1,13 +1,96 @@
 require 'sass'
 module Sass
   module Tree
+    class Node
+      private
+      def tab(s, indent_level = 1)
+        s.split("\n").join("\n" + "  " * indent_level)
+      end
+      def children_to_sass
+        clean_children = children.inject([[],true]) do |m,c|
+          if c.respond_to?(:doc) && !c.doc.nil?
+            [m.first, c.doc]
+          else
+            if m.last
+              [m.first + [c], true]
+            else
+              m
+            end
+          end
+        end
+        raise clean_children.first.inspect if clean_children.first.detect{|c| TrueClass === c}
+        tab(clean_children.first.
+          map{|c| c.to_sass}.join("\n"))
+      end
+    end
     class VariableNode < Node
       attr_accessor :name unless method_defined? :name
     end
+    class IfNode < Node
+      def to_sass
+        sass_str = %Q{@if #{@expr.inspect unless @expr.nil?}
+                     -  #{tab children_to_sass}
+                     -}.gsub(/^\s+-/,'')
+        if @else
+          sass_str << %Q{@else
+                       -  #{tab @else.to_sass}
+                       -}.gsub(/^\s+-/,'')
+        end
+        sass_str
+      end
+    end
+    class DebugNode < Node
+      def to_sass
+        ""
+      end
+    end
+    class MixinNode < Node
+      attr_accessor :name unless method_defined? :name
+      attr_accessor :args unless method_defined? :args
+      def to_sass
+        sass_str = "+#{name}"
+        if args.any?
+          sass_str << "(#{args.map{|a| a.inspect}.join(", ")})"
+        end
+        sass_str
+      end
+    end
     class MixinDefNode < Node
       attr_accessor :name unless method_defined? :name
       attr_accessor :args unless method_defined? :args
       attr_accessor :comment unless method_defined? :comment
+      
+      def to_sass
+        "#{sass_signature}\n  #{children_to_sass}\n"
+      end
+
+      def sass_signature(mode = :definition)
+        prefix = case mode
+        when :definition
+          "="
+        when :include
+          "+"
+        end
+        "#{prefix}#{name}#{arglist_to_sass}"
+      end
+
+      private
+      def arglist_to_sass
+        if args.any?
+          "(#{args.map{|a| arg_to_sass(a)}.join(", ")})"
+        else
+          ""
+        end
+      end
+      def arg_to_sass(arg)
+        name, default_value = arg
+        sass_str = "#{name.inspect}"
+        if default_value
+          sass_str << " = "
+          sass_str << default_value.inspect
+        end
+        sass_str
+      end
     end
     class ImportNode < RootNode
       attr_accessor :imported_filename unless method_defined? :imported_filename
@@ -16,6 +99,13 @@ module Sass
       def docstring
         ([value] + lines).join("\n")
       end
+      def doc
+        if value == "@doc off"
+          false
+        elsif value == "@doc on"
+          true
+        end
+      end
     end
   end
 end