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module ActionView #:nodoc:
class TemplateFinder #:nodoc:
class InvalidViewPath < StandardError #:nodoc:
attr_reader :unprocessed_path
def initialize(path)
@unprocessed_path = path
super("Unprocessed view path found: #{@unprocessed_path.inspect}. Set your view paths with #append_view_path, #prepend_view_path, or #view_paths=.")
end
end
cattr_reader :processed_view_paths
@@processed_view_paths = Hash.new {|hash, key| hash[key] = []}
cattr_reader :file_extension_cache
@@file_extension_cache = Hash.new {|hash, key|
hash[key] = Hash.new {|hash, key| hash[key] = []}
}
class << self #:nodoc:
# This method is not thread safe. Mutex should be used whenever this is accessed from an instance method
def process_view_paths(*view_paths)
view_paths.flatten.compact.each do |dir|
next if @@processed_view_paths.has_key?(dir)
@@processed_view_paths[dir] = []
Dir.glob("#{dir}/**/*").each do |file|
unless File.directory?(file)
@@processed_view_paths[dir] << file.split(dir).last.sub(/^\//, '')
# Build extension cache
extension = file.split(".").last
if template_handler_extensions.include?(extension)
key = file.split(dir).last.sub(/^\//, '').sub(/\.(\w+)$/, '')
@@file_extension_cache[dir][key] << extension
end
end
end
end
end
def update_extension_cache_for(extension)
@@processed_view_paths.keys.each do |dir|
Dir.glob("#{dir}/**/*.#{extension}").each do |file|
key = file.split(dir).last.sub(/^\//, '').sub(/\.(\w+)$/, '')
@@file_extension_cache[dir][key] << extension
end
end
end
def template_handler_extensions
ActionView::Template.template_handler_extensions
end
def reload!
view_paths = @@processed_view_paths.keys
@@processed_view_paths = Hash.new {|hash, key| hash[key] = []}
@@file_extension_cache = Hash.new {|hash, key|
hash[key] = Hash.new {|hash, key| hash[key] = []}
}
process_view_paths(view_paths)
end
end
attr_accessor :view_paths
def initialize(*args)
@template = args.shift
@view_paths = args.flatten
@view_paths = @view_paths.respond_to?(:find) ? @view_paths.dup : [*@view_paths].compact
check_view_paths(@view_paths)
end
def prepend_view_path(path)
@view_paths.unshift(*path)
self.class.process_view_paths(path)
end
def append_view_path(path)
@view_paths.push(*path)
self.class.process_view_paths(path)
end
def view_paths=(path)
@view_paths = path
self.class.process_view_paths(path)
end
def pick_template(template_path, extension)
file_name = "#{template_path}.#{extension}"
base_path = find_base_path_for(file_name)
base_path.blank? ? false : "#{base_path}/#{file_name}"
end
alias_method :template_exists?, :pick_template
def file_exists?(template_path)
# Clear the forward slash in the beginning if exists
template_path = template_path.sub(/^\//, '')
template_file_name, template_file_extension = path_and_extension(template_path)
if template_file_extension
template_exists?(template_file_name, template_file_extension)
else
template_exists?(template_file_name, pick_template_extension(template_path))
end
end
def find_base_path_for(template_file_name)
@view_paths.find { |path| @@processed_view_paths[path].include?(template_file_name) }
end
# Returns the view path that the full path resides in.
def extract_base_path_from(full_path)
@view_paths.find { |p| full_path[0..p.size - 1] == p }
end
# Gets the extension for an existing template with the given template_path.
# Returns the format with the extension if that template exists.
#
# pick_template_extension('users/show')
# # => 'html.erb'
#
# pick_template_extension('users/legacy')
# # => "rhtml"
#
def pick_template_extension(template_path)
find_template_extension_from_handler(template_path) || find_template_extension_from_first_render
end
def find_template_extension_from_handler(template_path)
formatted_template_path = "#{template_path}.#{@template.template_format}"
view_paths.each do |path|
if (extensions = @@file_extension_cache[path][formatted_template_path]).any?
return "#{@template.template_format}.#{extensions.first}"
elsif (extensions = @@file_extension_cache[path][template_path]).any?
return extensions.first.to_s
end
end
nil
end
# Splits the path and extension from the given template_path and returns as an array.
def path_and_extension(template_path)
template_path_without_extension = template_path.sub(/\.(\w+)$/, '')
[ template_path_without_extension, $1 ]
end
# Determine the template extension from the <tt>@first_render</tt> filename
def find_template_extension_from_first_render
File.basename(@template.first_render.to_s)[/^[^.]+\.(.+)$/, 1]
end
private
def check_view_paths(view_paths)
view_paths.each do |path|
raise InvalidViewPath.new(path) unless @@processed_view_paths.has_key?(path)
end
end
end
end
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