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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
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