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module AbstractController
module Layouts
extend ActiveSupport::DependencyModule
depends_on Renderer
included do
extlib_inheritable_accessor :_layout_conditions
self._layout_conditions = {}
end
module ClassMethods
def layout(layout, conditions = {})
unless [String, Symbol, FalseClass, NilClass].include?(layout.class)
raise ArgumentError, "Layouts must be specified as a String, Symbol, false, or nil"
end
conditions.each {|k, v| conditions[k] = Array(v).map {|a| a.to_s} }
self._layout_conditions = conditions
@_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(details) #{@_layout.inspect} end}
when Symbol
self.class_eval %{def _layout(details) #{@_layout} end}
when false
self.class_eval %{def _layout(details) end}
else
self.class_eval %{
def _layout(details)
if view_paths.find_by_parts?("#{_implied_layout_name}", details, "layouts")
"#{_implied_layout_name}"
else
super
end
end
}
end
end
end
private
def _layout(details) end # This will be overwritten
# :api: plugin
# ====
# Override this to mutate the inbound layout name
def _layout_for_name(name, details = {:formats => formats})
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, details, _layout_prefix(name))
end
# TODO: Decide if this is the best hook point for the feature
def _layout_prefix(name)
"layouts"
end
def _default_layout(require_layout = false, details = {:formats => formats})
if require_layout && _action_has_layout? && !_layout(details)
raise ArgumentError,
"There was no default layout for #{self.class} in #{view_paths.inspect}"
end
begin
_layout_for_name(_layout(details), details) if _action_has_layout?
rescue NameError => e
raise NoMethodError,
"You specified #{@_layout.inspect} as the layout, but no such method was found"
end
end
def _action_has_layout?
conditions = _layout_conditions
if only = conditions[:only]
only.include?(action_name)
elsif except = conditions[:except]
!except.include?(action_name)
else
true
end
end
end
end
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