Destroy a filter compiler

because its design is not well-considered.

lib/hamlit/compilers/filter.rb

@@ -1,65 +1,25 @@
 require 'hamlit/concerns/included'
 require 'hamlit/concerns/registerable'
-require 'hamlit/filters/css'
-require 'hamlit/filters/javascript'
-require 'hamlit/filters/ruby'
 
 module Hamlit
   module Compilers
     module Filter
       extend Concerns::Included
 
-      BASE_DEPTH      = 2
-      IGNORED_FILTERS = %w[ruby].freeze
-
       included do
         extend Concerns::Registerable
-
-        register :javascript, Filters::Javascript
-        register :css,        Filters::Css
-        register :ruby,       Filters::Ruby
       end
 
       def on_haml_filter(name, exp)
-        exp = format_expressions(name, exp)
-
-        ast = Compiler.find(name).compile(exp)
+        ast = compile_filter(name, exp)
         compile(ast)
       end
 
       private
 
-      def format_expressions(name, lines)
-        return lines if IGNORED_FILTERS.include?(name)
-
-        lines = [''] if lines.empty?
-        lines = unindent_lines(lines)
-
-        [:multi, [:static, "\n"], *wrap_newlines(lines)]
-      end
-
-      def unindent_lines(lines)
-        base = lines.first.index(/[^\s]/) || 0
-        lines.map do |line|
-          change_indent(line, BASE_DEPTH - base)
-        end
-      end
-
-      def change_indent(line, diff)
-        if diff >= 0
-          ((' ' * diff) + line).gsub(/ *\Z/, '')
-        else
-          line.gsub(/^[[:blank:]]{#{-1 * diff}}/, '')
-        end
-      end
-
-      def wrap_newlines(lines)
-        ast = []
-        lines.each do |line|
-          ast << [:haml, :text, line]
-          ast << [:static, "\n"]
-        end
-        ast
+      def compile_filter(name, exp)
+        compiler = Compiler.find(name)
+        compiler.compile(exp)
       end
     end
   end

lib/hamlit/filters/css.rb

@@ -1,9 +0,0 @@
-module Hamlit
-  module Filters
-    class Css
-      def compile(exp)
-        [:html, :tag, 'style', [:html, :attrs], exp]
-      end
-    end
-  end
-end

lib/hamlit/filters/javascript.rb

@@ -1,9 +0,0 @@
-module Hamlit
-  module Filters
-    class Javascript
-      def compile(exp)
-        [:html, :tag, 'script', [:html, :attrs], [:html, :js, exp]]
-      end
-    end
-  end
-end

lib/hamlit/filters/ruby.rb

@@ -1,9 +0,0 @@
-module Hamlit
-  module Filters
-    class Ruby
-      def compile(exp)
-        [:multi, [:code, exp.join("\n")], [:newline]]
-      end
-    end
-  end
-end