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require "pathname"
require "active_support/core_ext/class"
require "action_view/template/template"
module ActionView
# Abstract superclass
class Resolver
class_inheritable_accessor(:registered_details)
self.registered_details = {}
def self.register_detail(name, options = {})
registered_details[name] = lambda do |val|
val ||= yield
val |= [nil] unless options[:allow_nil] == false
val
end
end
register_detail(:locale) { [I18n.locale] }
register_detail(:formats) { Mime::SET.symbols }
register_detail(:handlers, :allow_nil => false) do
TemplateHandlers.extensions
end
def initialize(options = {})
@cache = options[:cache]
@cached = {}
end
# Normalizes the arguments and passes it on to find_template
def find(*args)
find_all(*args).first
end
def find_all(name, details = {}, prefix = nil, partial = nil)
details = normalize_details(details)
name, prefix = normalize_name(name, prefix)
cached([name, details, prefix, partial]) do
find_templates(name, details, prefix, partial)
end
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 normalize_details(details)
details = details.dup
# TODO: Refactor this concern out of the resolver
details.delete(:formats) if details[:formats] == [:"*/*"]
registered_details.each do |k, v|
details[k] = v.call(details[k])
end
details
end
# Support legacy foo.erb names even though we now ignore .erb
# as well as incorrectly putting part of the path in the template
# name instead of the prefix.
def normalize_name(name, prefix)
handlers = TemplateHandlers.extensions.join('|')
name = name.to_s.gsub(/\.(?:#{handlers})$/, '')
parts = name.split('/')
return parts.pop, [prefix, *parts].compact.join("/")
end
def cached(key)
return yield unless @cache
return @cached[key] if @cached.key?(key)
@cached[key] = yield
end
end
class PathResolver < Resolver
EXTENSION_ORDER = [:locale, :formats, :handlers]
def to_s
@path.to_s
end
alias to_path to_s
def find_templates(name, details, prefix, partial)
path = build_path(name, details, prefix, partial)
query(path, EXTENSION_ORDER.map { |ext| details[ext] })
end
private
def build_path(name, details, prefix, partial)
path = ""
path << "#{prefix}/" unless prefix.empty?
path << (partial ? "_#{name}" : name)
path
end
def query(path, exts)
query = "#{@path}/#{path}"
exts.each do |ext|
query << '{' << ext.map {|e| e && ".#{e}" }.join(',') << '}'
end
Dir[query].map do |path|
next if File.directory?(path)
source = File.read(path)
identifier = Pathname.new(path).expand_path.to_s
Template.new(source, identifier, *path_to_details(path))
end.compact
end
# # TODO: fix me
# # :api: plugin
def path_to_details(path)
# [:erb, :format => :html, :locale => :en, :partial => true/false]
if m = path.match(%r'(?:^|/)(_)?[\w-]+(\.[\w-]+)*\.(\w+)$')
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 FileSystemResolver < PathResolver
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
end
# OMG HAX
# TODO: remove hax
class FileSystemResolverWithFallback < Resolver
def initialize(path, options = {})
super(options)
@paths = [FileSystemResolver.new(path, options), FileSystemResolver.new("", options), FileSystemResolver.new("/", options)]
end
def find_templates(*args)
@paths.each do |p|
template = p.find_templates(*args)
return template unless template.empty?
end
[]
end
def to_s
@paths.first.to_s
end
end
end
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