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module Compass
module Configuration
# The inheritance module makes it easy for configuration data to inherit from
# other instances of configuration data. This makes it easier for external code to layer
# bits of configuration from various sources.
module Inheritance
def self.included(base)
# inherited_data stores configuration data that this configuration object will
# inherit if not provided explicitly.
base.send :attr_accessor, :inherited_data, :set_attributes, :top_level
base.send(:include, InstanceMethods)
base.extend(ClassMethods)
end
module ClassMethods
def inherited_writer(*attributes)
attributes.each do |attribute|
line = __LINE__ + 1
class_eval %Q{
def #{attribute}=(value) # def css_dir=(value)
@set_attributes ||= {} # @set_attributes ||= {}
@set_attributes[#{attribute.inspect}] = true # @set_attributes[:css_dir] = true
@#{attribute} = value # @css_dir = value
end # end
def unset_#{attribute}! # def unset_css_dir!
unset!(#{attribute.inspect}) # unset!(:css_dir)
end # end
def #{attribute}_set? # def css_dir_set?
set?(#{attribute.inspect}) # set?(:css_dir)
end # end
}, __FILE__, line
end
end
# Defines the default reader to be an inherited_reader that will look at the inherited_data for its
# value when not set. The inherited reader calls to a raw reader that acts like a normal attribute
# reader but prefixes the attribute name with "raw_".
def inherited_reader(*attributes)
attributes.each do |attribute|
line = __LINE__ + 1
class_eval %Q{
def raw_#{attribute} # def raw_css_dir
@#{attribute} # @css_dir
end # end
def #{attribute}_without_default # def css_dir_without_default
read_without_default(#{attribute.inspect}) # read_without_default(:css_dir)
end # end
def #{attribute} # def css_dir
read(#{attribute.inspect}) # read(:css_dir)
end # end
}, __FILE__, line
end
end
def inherited_accessor(*attributes)
inherited_reader(*attributes)
inherited_writer(*attributes)
end
class ArrayProxy
def initialize(data, attr)
@data, @attr = data, attr
end
def to_ary
@data.send(:"read_inherited_#{@attr}_array")
end
def to_a
to_ary
end
def <<(v)
@data.send(:"add_to_#{@attr}", v)
end
def >>(v)
@data.send(:"remove_from_#{@attr}", v)
end
def serialize_to_config(prop)
if v = @data.raw(prop)
"#{prop} = #{v.inspect}"
else
s = ""
if added = @data.instance_variable_get("@added_to_#{@attr}")
added.each do |a|
s << "#{prop} << #{a.inspect}\n"
end
end
if removed = @data.instance_variable_get("@removed_from_#{@attr}")
removed.each do |r|
s << "#{prop} >> #{r.inspect}\n"
end
end
if s[-1..-1] == "\n"
s[0..-2]
else
s
end
end
end
def method_missing(m, *args, &block)
a = to_ary
if a.respond_to?(m)
a.send(m,*args, &block)
else
super
end
end
end
def inherited_array(*attributes)
options = attributes.last.is_a?(Hash) ? attributes.pop : {}
inherited_reader(*attributes)
inherited_writer(*attributes)
attributes.each do |attr|
line = __LINE__ + 1
class_eval %Q{
def #{attr} # def sprite_load_paths
ArrayProxy.new(self, #{attr.inspect}) # ArrayProxy.new(self, :sprite_load_paths)
end # end
def #{attr}=(value) # def sprite_load_paths=(value)
@set_attributes ||= {} # @set_attributes ||= {}
@set_attributes[#{attr.inspect}] = true # @set_attributes[:sprite_load_paths] = true
@#{attr} = Array(value) # @sprite_load_paths = Array(value)
@added_to_#{attr} = [] # @added_to_sprite_load_paths = []
@removed_from_#{attr} = [] # @removed_from_sprite_load_paths = []
end # end
def read_inherited_#{attr}_array # def read_inherited_sprite_load_paths_array
value = if inherited_data # value = if inherited_data
if #{!!options[:clobbers]} && #{attr}_set?
Array(@#{attr}) # Array(@#{attr})
else
Array(@#{attr}) + inherited_data.read_inherited_#{attr}_array # inherited_data.read_inherited_sprite_load_paths_array + Array(@sprite_load_paths)
end
elsif #{attr}_set? # elsif sprite_load_paths_set?
Array(@#{attr}) # Array(@#{attr})
else # else
top_level.default_for(#{attr.inspect}) || [] # top_level.default_for(:sprite_load_paths) || []
end # end
value -= Array(@removed_from_#{attr}) # value -= Array(@removed_from_sprite_load_paths)
Array(@added_to_#{attr}) + value # Array(@added_to_sprite_load_paths) + value
end # end
def add_to_#{attr}(v) # def add_to_sprite_load_paths(v)
if #{attr}_set? # if sprite_load_paths_set?
raw_#{attr} << v # raw_sprite_load_paths << v
else # else
(@added_to_#{attr} ||= []) << v # (@added_to_sprite_load_paths ||= []) << v
end # end
end # end
def remove_from_#{attr}(v) # def remove_from_sprite_load_paths(v)
if #{attr}_set? # if sprite_load_paths_set?
raw_#{attr}.reject!{|e| e == v} # raw_sprite_load_path.reject!{|e| e == v}s
else # else
(@removed_from_#{attr} ||= []) << v # (@removed_from_sprite_load_paths ||= []) << v
end # end
end # end
}, __FILE__, line
end
end
def chained_method(method)
line = __LINE__ + 1
class_eval %Q{
alias_method :_chained_#{method}, method
def #{method}(*args, &block)
_chained_#{method}(*args, &block)
if inherited_data
inherited_data.#{method}(*args, &block)
end
end
}, __FILE__, line
end
end
module InstanceMethods
def on_top!
self.set_top_level(self)
end
def set_top_level(new_top)
self.top_level = new_top
if self.inherited_data.respond_to?(:set_top_level)
self.inherited_data.set_top_level(new_top)
end
end
def inherit_from!(data)
if self.inherited_data
self.inherited_data.inherit_from!(data)
else
self.inherited_data = data
end
self
end
def reset_inheritance!
self.inherited_data = nil
end
def with_defaults(data)
inherit_from!(data)
yield
reset_inheritance!
end
def unset!(attribute)
@set_attributes ||= {}
send("#{attribute}=", nil)
@set_attributes.delete(attribute)
nil
end
def set?(attribute)
@set_attributes ||= {}
@set_attributes[attribute]
end
def any_attributes_set?
@set_attributes && @set_attributes.size > 0
end
def default_for(attribute)
method = "default_#{attribute}".to_sym
if respond_to?(method)
send(method)
end
end
# Read an explicitly set value that is either inherited or set on this instance
def read_without_default(attribute)
if set?(attribute)
send("raw_#{attribute}")
elsif inherited_data.nil?
nil
elsif inherited_data.respond_to?("#{attribute}_without_default")
inherited_data.send("#{attribute}_without_default")
elsif inherited_data.respond_to?(attribute)
inherited_data.send(attribute)
end
end
# Reads the raw value that was set on this object.
# you generally should call raw_<attribute>() instead.
def raw(attribute)
instance_variable_get("@#{attribute}")
end
# Read a value that is either inherited or set on this instance, if we get to the bottom-most configuration instance,
# we ask for the default starting at the top level.
def read(attribute)
if !(v = send("#{attribute}_without_default")).nil?
v
else
top_level.default_for(attribute)
end
end
def method_missing(meth, *args, &block)
if inherited_data
inherited_data.send(meth, *args, &block)
else
raise NoMethodError, meth.to_s
end
end
def respond_to?(meth)
if super
true
elsif inherited_data
inherited_data.respond_to?(meth)
else
false
end
end
def chain
instances = [self]
instances << instances.last.inherited_data while instances.last.inherited_data
instances
end
def debug
normalized_attrs = {}
(ATTRIBUTES + ARRAY_ATTRIBUTES).each do |prop|
values = []
chain.each do |instance|
values << {
:raw => (instance.send("raw_#{prop}") rescue nil),
:value => (instance.send("#{prop}_without_default") rescue nil),
:default => (instance.send("default_#{prop}") rescue nil),
:resolved => instance.send(prop)
}
end
normalized_attrs[prop] = values
end
normalized_attrs
end
end
end
end
end
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