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Contents
require 'active_support' unless defined?(ActiveSupport)
class Class
def dsl_accessor(name, options = {})
raise TypeError, "DSL Error: options should be a hash. but got `#{options.class}'" unless options.is_a?(Hash)
writer = options[:writer] || options[:setter]
writer =
case writer
when NilClass then Proc.new{|value| value}
when Symbol then Proc.new{|value| __send__(writer, value)}
when Proc then writer
else raise TypeError, "DSL Error: writer should be a symbol or proc. but got `#{options[:writer].class}'"
end
write_inheritable_attribute(:"#{name}_writer", writer)
default =
case options[:default]
when NilClass then nil
when [] then Proc.new{[]}
when {} then Proc.new{{}}
when Symbol then Proc.new{__send__(options[:default])}
when Proc then options[:default]
else Proc.new{options[:default]}
end
write_inheritable_attribute(:"#{name}_default", default)
self.class.class_eval do
define_method("#{name}=") do |value|
writer = read_inheritable_attribute(:"#{name}_writer")
value = writer.call(value) if writer
write_inheritable_attribute(:"#{name}", value)
end
define_method(name) do |*values|
if values.empty?
# getter method
key = :"#{name}"
if !inheritable_attributes.has_key?(key)
default = read_inheritable_attribute(:"#{name}_default")
value = default ? default.call(self) : nil
__send__("#{name}=", value)
end
read_inheritable_attribute(key)
else
# setter method
__send__("#{name}=", *values)
end
end
end
end
end
Version data entries
12 entries across 12 versions & 4 rubygems