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require "pathname"
require "active_support/core_ext/class"
require "active_support/core_ext/array/wrap"
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
def find(*args)
find_all(*args).first
end
# Normalizes the arguments and passes it on to find_template.
def find_all(name, prefix=nil, partial=false, details={}, key=nil)
name, prefix = normalize_name(name, prefix)
details = details.merge(:handlers => default_handlers)
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
def default_handlers
Template::Handlers.extensions + [nil]
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
# 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 = Template::Handlers.extensions.join('|')
name = name.to_s.gsub(/\.(?:#{handlers})$/, '')
parts = name.split('/')
return parts.pop, [prefix, *parts].compact.join("/")
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(partial, path, EXTENSION_ORDER.map { |ext| details[ext] })
end
def build_path(name, prefix, partial, details)
path = ""
path << "#{prefix}/" unless prefix.empty?
path << (partial ? "_#{name}" : name)
path
end
def query(partial, path, exts)
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)
Template.new(File.read(p), File.expand_path(p), handler,
:partial => partial, :virtual_path => path, :format => format)
end
end
def extract_handler_and_format(path)
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
[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
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