From 0a132c2fe13fb2b8d5dade9cf6abd70601376287 Mon Sep 17 00:00:00 2001
From: Yehuda Katz + Carl Lerche <ykatz+clerche@engineyard.com>
Date: Wed, 22 Apr 2009 17:16:28 -0700
Subject: Refactor ActionView::Path

  * Decouple from ActionController and ActionMailer
  * Bring back localization support.
  * Prepare to decouple templates from the filesystem.
  * Prepare to decouple localization from ActionView
  * Fix ActionMailer to take advantage of ActionView::Path
---
 actionpack/lib/action_view/template/path.rb | 151 ++++++++++++++++++----------
 1 file changed, 97 insertions(+), 54 deletions(-)

(limited to 'actionpack/lib/action_view/template/path.rb')

diff --git a/actionpack/lib/action_view/template/path.rb b/actionpack/lib/action_view/template/path.rb
index 9709549b70..660a7e91a2 100644
--- a/actionpack/lib/action_view/template/path.rb
+++ b/actionpack/lib/action_view/template/path.rb
@@ -1,13 +1,81 @@
 module ActionView
   class Template
+  # Abstract super class
     class Path
-      attr_reader :path, :paths
-      delegate :hash, :inspect, :to => :path
-      
       def initialize(options)
-        @cache = options[:cache]
+        @cache  = options[:cache]
+        @cached = {}
       end
-
+    
+      # Normalizes the arguments and passes it on to find_template
+      def find_by_parts(*args)
+        find_all_by_parts(*args).first
+      end
+      
+      def find_all_by_parts(name, details = {}, prefix = nil, partial = nil)
+        details[:locales] = [I18n.locale]
+        name = name.to_s.gsub(handler_matcher, '').split("/")
+        find_templates(name.pop, details, [prefix, *name].compact.join("/"), partial)
+      end
+    
+    private
+      
+      # This is what child classes implement. No defaults are needed
+      # because Path guarentees that the arguments are present and
+      # normalized.
+      def find_templates(name, details, prefix, partial)
+        raise NotImplementedError
+      end
+  
+      # TODO: Refactor this to abstract out the file system
+      def initialize_template(file)
+        t = Template.new(file.split("#{self}/").last, self)
+        t.load!
+        t
+      end
+      
+      def valid_handlers
+        @valid_handlers ||= TemplateHandlers.extensions
+      end
+      
+      def handler_matcher
+        @handler_matcher ||= begin
+          e = valid_handlers.join('|')
+          /\.(?:#{e})$/
+        end
+      end
+      
+      def handler_glob
+        e = TemplateHandlers.extensions.join(',')
+        ".{#{e}}"
+      end
+      
+      def formats_glob
+        @formats_glob ||= begin
+          formats = Mime::SET.map { |m| m.symbol }
+          '{' + formats.map { |l| ".#{l}," }.join + '}'
+        end
+      end
+      
+      def cached(key)
+        return yield unless @cache
+        return @cached[key] if @cached.key?(key)
+        @cached[key] = yield
+      end
+    end
+  
+    class FileSystemPath < Path
+    
+      def initialize(path, options = {})
+        raise ArgumentError, "path already is a Path class" if path.is_a?(Path)
+        super(options)
+        @path = path
+      end
+    
+      # TODO: This is the currently needed API. Make this suck less
+      # ==== <suck>
+      attr_reader :path
+    
       def to_s
         if defined?(RAILS_ROOT)
           path.to_s.sub(/^#{Regexp.escape(File.expand_path(RAILS_ROOT))}\//, '')
@@ -27,61 +95,36 @@ module ActionView
       def eql?(path)
         to_str == path.to_str
       end
-
-      def find_by_parts(name, extensions = nil, prefix = nil, partial = nil)
-        path = prefix ? "#{prefix}/" : ""
+      # ==== </suck>
     
-        name = name.to_s.split("/")
-        name[-1] = "_#{name[-1]}" if partial
-    
-        path << name.join("/")
-
-        template = nil
-
-        Array(extensions).each do |extension|
-          extensioned_path = extension ? "#{path}.#{extension}" : path
-          break if (template = find_template(extensioned_path))
+      def find_templates(name, details, prefix, partial)
+        if glob = parts_to_glob(name, details, prefix, partial)
+          cached(glob) do
+            Dir[glob].map do |path|
+              initialize_template(path) unless File.directory?(path)
+            end.compact
+          end
         end
-        template || find_template(path)
       end
-  
-    private
-      def create_template(file)
-        Template.new(file.split("#{self}/").last, self)
-      end
-    end
-
-    class FileSystemPath < Path
-      def initialize(path, options = {})
-        raise ArgumentError, "path already is a Path class" if path.is_a?(Path)        
-        
-        super(options)
-        @path, @paths = path, {}
-        
-        # **/*/** is a hax for symlinked directories
-        load_templates("#{@path}/{**/*,**}/**") if @cache
-      end
-
-    private
-    
-      def load_template(template)
-        template.load!
-        template.accessible_paths.each do |path|
-          @paths[path] = template
-        end
-      end
-    
-      def find_template(path)
-        load_templates("#{@path}/#{path}{,.*}") unless @cache
-        @paths[path]
-      end    
     
-      def load_templates(glob)
-        Dir[glob].each do |file|
-          load_template(create_template(file)) unless File.directory?(file)
+    private
+  
+      def parts_to_glob(name, details, prefix, partial)
+        path = ""
+        path << "#{prefix}/" unless prefix.empty?
+        path << (partial ? "_#{name}" : name)
+      
+        extensions = ""
+        [:locales, :formats].each do |k|
+          extensions << if exts = details[k]
+            '{' + exts.map {|e| ".#{e},"}.join + '}'
+          else
+            k == :formats ? formats_glob : ''
+          end
         end
+        
+        "#{@path}/#{path}#{extensions}#{handler_glob}"
       end
-      
     end
   end
 end
\ No newline at end of file
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