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module AbstractController
module Layouts
depends_on Renderer
module ClassMethods
def layout(layout)
unless [String, Symbol, FalseClass, NilClass].include?(layout.class)
raise ArgumentError, "Layouts must be specified as a String, Symbol, false, or nil"
end
@_layout = layout || false # Converts nil to false
_write_layout_method
end
def _implied_layout_name
name.underscore
end
# Takes the specified layout and creates a _layout method to be called
# by _default_layout
#
# If the specified layout is a:
# String:: return the string
# Symbol:: call the method specified by the symbol
# false:: return nil
# none:: If a layout is found in the view paths with the controller's
# name, return that string. Otherwise, use the superclass'
# layout (which might also be implied)
def _write_layout_method
case @_layout
when String
self.class_eval %{def _layout() #{@_layout.inspect} end}
when Symbol
self.class_eval %{def _layout() #{@_layout} end}
when false
self.class_eval %{def _layout() end}
else
self.class_eval %{
def _layout
if view_paths.find_by_parts?("#{_implied_layout_name}", formats, "layouts")
"#{_implied_layout_name}"
else
super
end
end
}
end
end
end
def _render_template(template, options)
_action_view._render_template_with_layout(template, options[:_layout])
end
private
def _layout() end # This will be overwritten
def _layout_for_name(name)
unless [String, FalseClass, NilClass].include?(name.class)
raise ArgumentError, "String, false, or nil expected; you passed #{name.inspect}"
end
name && view_paths.find_by_parts(name, formats, "layouts")
end
def _default_layout(require_layout = false)
if require_layout && !_layout
raise ArgumentError,
"There was no default layout for #{self.class} in #{view_paths.inspect}"
end
begin
layout = _layout_for_name(_layout)
rescue NameError => e
raise NoMethodError,
"You specified #{@_layout.inspect} as the layout, but no such method was found"
end
end
end
end
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