require "pathname" require "active_support/core_ext/class" require "action_view/template" module ActionView class Resolver def initialize @cached = Hash.new { |h1,k1| h1[k1] = Hash.new { |h2,k2| h2[k2] = Hash.new { |h3, k3| h3[k3] = {} } } } end def clear_cache @cached.clear end # Normalizes the arguments and passes it on to find_template. def find_all(name, prefix=nil, partial=false, details={}, key=nil) cached(key, prefix, name, partial) do find_templates(name, prefix, partial, details) end end private def caching? @caching ||= !defined?(Rails.application) || Rails.application.config.cache_classes end # This is what child classes implement. No defaults are needed # because Resolver guarantees that the arguments are present and # normalized. def find_templates(name, prefix, partial, details) raise NotImplementedError end def cached(key, prefix, name, partial) return yield unless key && caching? scope = @cached[key][prefix][name] if scope.key?(partial) scope[partial] else scope[partial] = yield end end end class PathResolver < Resolver EXTENSION_ORDER = [:locale, :formats, :handlers] def to_s @path.to_s end alias :to_path :to_s private def find_templates(name, prefix, partial, details) path = build_path(name, prefix, partial, details) query(path, EXTENSION_ORDER.map { |ext| details[ext] }, details[:formats]) end def build_path(name, prefix, partial, details) path = "" path << "#{prefix}/" unless prefix.empty? path << (partial ? "_#{name}" : name) path end def query(path, exts, formats) query = File.join(@path, path) exts.each do |ext| query << '{' << ext.map {|e| e && ".#{e}" }.join(',') << ',}' end Dir[query].reject { |p| File.directory?(p) }.map do |p| handler, format = extract_handler_and_format(p, formats) Template.new(File.read(p), File.expand_path(p), handler, :virtual_path => path, :format => format) end end # Extract handler and formats from path. If a format cannot be a found neither # from the path, or the handler, we should return the array of formats given # to the resolver. def extract_handler_and_format(path, default_formats) pieces = File.basename(path).split(".") pieces.shift handler = Template.handler_class_for_extension(pieces.pop) format = pieces.last && Mime[pieces.last] && pieces.pop.to_sym format ||= handler.default_format if handler.respond_to?(:default_format) format ||= default_formats [handler, format] end end class FileSystemResolver < PathResolver def initialize(path) raise ArgumentError, "path already is a Resolver class" if path.is_a?(Resolver) super() @path = Pathname.new(path).expand_path end def eql?(resolver) self.class.equal?(resolver.class) && to_path == resolver.to_path end alias :== :eql? end end