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require "pathname"
require "action_view/template/template"
module ActionView
# Abstract superclass
class Resolver
def initialize(options = {})
@cache = options[:cache]
@cached = {}
end
# Normalizes the arguments and passes it on to find_template
def find(*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 Resolver guarantees that the arguments are present and
# normalized.
def find_templates(name, details, prefix, partial)
raise NotImplementedError
end
def valid_handlers
@valid_handlers ||= TemplateHandlers.extensions
end
def handler_matcher
@handler_matcher ||= begin
e = valid_handlers.join('|')
/\.(?:#{e})$/
end
end
def handler_glob
@handler_glob ||= begin
e = TemplateHandlers.extensions.map{|h| ".#{h}"}.join(",")
"{#{e}}"
end
end
def formats_glob
@formats_glob ||= begin
'{' + Mime::SET.symbols.map { |l| ".#{l}," }.join + '}'
end
end
def cached(key)
return yield unless @cache
return @cached[key] if @cached.key?(key)
@cached[key] = yield
end
end
class FileSystemResolver < Resolver
def self.cached_glob
@@cached_glob ||= {}
end
def initialize(path, options = {})
raise ArgumentError, "path already is a Resolver class" if path.is_a?(Resolver)
super(options)
@path = Pathname.new(path).expand_path
end
def to_s
@path.to_s
end
alias to_path to_s
def find_templates(name, details, prefix, partial, root = "#{@path}/")
if glob = details_to_glob(name, details, prefix, partial, root)
cached(glob) do
Dir[glob].map do |path|
next if File.directory?(path)
source = File.read(path)
identifier = Pathname.new(path).expand_path.to_s
Template.new(source, identifier, *path_to_details(path))
end.compact
end
end
end
private
# :api: plugin
def details_to_glob(name, details, prefix, partial, root)
self.class.cached_glob[[name, prefix, partial, details, root]] ||= begin
path = ""
path << "#{prefix}/" unless prefix.empty?
path << (partial ? "_#{name}" : name)
extensions = ""
[:locales, :formats].each do |k|
# TODO: OMG NO
if details[k] == [:"*/*"]
extensions << formats_glob if k == :formats
elsif exts = details[k]
extensions << '{' + exts.map {|e| ".#{e},"}.join + '}'
else
extensions << formats_glob if k == :formats
end
end
"#{root}#{path}#{extensions}#{handler_glob}"
end
end
# TODO: fix me
# :api: plugin
def path_to_details(path)
# [:erb, :format => :html, :locale => :en, :partial => true/false]
if m = path.match(%r'/(_)?[\w-]+(\.[\w-]+)*\.(\w+)$')
partial = m[1] == '_'
details = (m[2]||"").split('.').reject { |e| e.empty? }
handler = Template.handler_class_for_extension(m[3])
format = Mime[details.last] && details.pop.to_sym
locale = details.last && details.pop.to_sym
return handler, :format => format, :locale => locale, :partial => partial
end
end
end
class FileSystemResolverWithFallback < FileSystemResolver
def find_templates(name, details, prefix, partial)
templates = super
return super(name, details, prefix, partial, '') if templates.empty?
templates
end
end
end
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