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module ActionView #:nodoc:
module TemplateHandlers #:nodoc:
autoload :ERB, 'action_view/template_handlers/erb'
autoload :RJS, 'action_view/template_handlers/rjs'
autoload :Builder, 'action_view/template_handlers/builder'
def self.extended(base)
base.register_default_template_handler :erb, TemplateHandlers::ERB
base.register_template_handler :rjs, TemplateHandlers::RJS
base.register_template_handler :builder, TemplateHandlers::Builder
# TODO: Depreciate old template extensions
base.register_template_handler :rhtml, TemplateHandlers::ERB
base.register_template_handler :rxml, TemplateHandlers::Builder
end
@@template_handlers = {}
@@default_template_handlers = nil
# Register a class that knows how to handle template files with the given
# extension. This can be used to implement new template types.
# The constructor for the class must take the ActiveView::Base instance
# as a parameter, and the class must implement a +render+ method that
# takes the contents of the template to render as well as the Hash of
# local assigns available to the template. The +render+ method ought to
# return the rendered template as a string.
def register_template_handler(extension, klass)
@@template_handlers[extension.to_sym] = klass
end
def valid_extension?(extension)
template_handler_extensions.include?(extension) || init_path_for_extension(extension)
end
def template_handler_extensions
@@template_handlers.keys.map(&:to_s).sort
end
def register_default_template_handler(extension, klass)
register_template_handler(extension, klass)
@@default_template_handlers = klass
end
def handler_class_for_extension(extension)
(extension && @@template_handlers[extension.to_sym] || autoload_handler_class(extension)) ||
@@default_template_handlers
end
private
def autoload_handler_class(extension)
return if Gem.loaded_specs[extension]
return unless init_path = init_path_for_extension(extension)
Gem.activate(extension)
load(init_path)
handler_class_for_extension(extension)
end
# Returns the path to the rails/init.rb file for the given extension,
# or nil if no gem provides it.
def init_path_for_extension(extension)
return unless spec = Gem.searcher.find(extension.to_s)
returning File.join(spec.full_gem_path, 'rails', 'init.rb') do |path|
return unless File.file?(path)
end
end
end
end
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