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require "pathname"
require "active_support/core_ext/class"
require "action_view/template"
module ActionView
# = Action View Resolver
class Resolver
cattr_accessor :caching
self.caching = true
class << self
alias :caching? :caching
end
def initialize
@cached = Hash.new { |h1,k1| h1[k1] = Hash.new { |h2,k2|
h2[k2] = Hash.new { |h3,k3| h3[k3] = Hash.new { |h4,k4| h4[k4] = {} } } } }
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, locals=[])
cached(key, [name, prefix, partial], details, locals) do
find_templates(name, prefix, partial, details)
end
end
private
delegate :caching?, :to => "self.class"
# 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
# Helpers that builds a path. Useful for building virtual paths.
def build_path(name, prefix, partial)
path = ""
path << "#{prefix}/" unless prefix.empty?
path << (partial ? "_#{name}" : name)
path
end
# Handles templates caching. If a key is given and caching is on
# always check the cache before hitting the resolver. Otherwise,
# it always hits the resolver but check if the resolver is fresher
# before returning it.
def cached(key, path_info, details, locals) #:nodoc:
name, prefix, partial = path_info
locals = sort_locals(locals)
if key && caching?
@cached[key][name][prefix][partial][locals] ||= decorate(yield, path_info, details, locals)
else
fresh = decorate(yield, path_info, details, locals)
return fresh unless key
scope = @cached[key][name][prefix][partial]
cache = scope[locals]
mtime = cache && cache.map(&:updated_at).max
if !mtime || fresh.empty? || fresh.any? { |t| t.updated_at > mtime }
scope[locals] = fresh
else
cache
end
end
end
# Ensures all the resolver information is set in the template.
def decorate(templates, path_info, details, locals) #:nodoc:
cached = nil
templates.each do |t|
t.locals = locals
t.formats = details[:formats] || [:html] if t.formats.empty?
t.virtual_path ||= (cached ||= build_path(*path_info))
end
end
if :symbol.respond_to?("<=>")
def sort_locals(locals) #:nodoc:
locals.sort.freeze
end
else
def sort_locals(locals) #:nodoc:
locals = locals.map{ |l| l.to_s }
locals.sort!
locals.freeze
end
end
end
class PathResolver < Resolver
EXTENSION_ORDER = [:locale, :formats, :handlers]
private
def find_templates(name, prefix, partial, details)
path = build_path(name, prefix, partial)
query(path, EXTENSION_ORDER.map { |ext| details[ext] }, details[:formats])
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)
contents = File.open(p, "rb") {|io| io.read }
Template.new(contents, File.expand_path(p), handler,
:virtual_path => path, :format => format, :updated_at => mtime(p))
end
end
# Returns the file mtime from the filesystem.
def mtime(p)
File.stat(p).mtime
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_for_extension(pieces.pop)
format = pieces.last && Mime[pieces.last]
[handler, format]
end
end
# A resolver that loads files from the filesystem.
class FileSystemResolver < PathResolver
def initialize(path)
raise ArgumentError, "path already is a Resolver class" if path.is_a?(Resolver)
super()
@path = File.expand_path(path)
end
def to_s
@path.to_s
end
alias :to_path :to_s
def eql?(resolver)
self.class.equal?(resolver.class) && to_path == resolver.to_path
end
alias :== :eql?
end
# The same as FileSystemResolver but does not allow templates to store
# a virtual path since it is invalid for such resolvers.
class FallbackFileSystemResolver < FileSystemResolver
def self.instances
[new(""), new("/")]
end
def decorate(*)
super.each { |t| t.virtual_path = nil }
end
end
end
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