module Arborist::MethodUtilities
A collection of methods for declaring other methods.
class MyClass extend Arborist::MethodUtilities singleton_attr_accessor :types singleton_method_alias :kinds, :types end MyClass.types = [ :pheno, :proto, :stereo ] MyClass.kinds # => [:pheno, :proto, :stereo]
Public Instance Methods
Create a reader in the form of a predicate for the given attrname
.
# File lib/arborist/mixins.rb, line 72 def attr_predicate( attrname ) attrname = attrname.to_s.chomp( '?' ) define_method( "#{attrname}?" ) do instance_variable_get( "@#{attrname}" ) ? true : false end end
Create a reader in the form of a predicate for the given attrname
as well as a regular writer method.
# File lib/arborist/mixins.rb, line 82 def attr_predicate_accessor( attrname ) attrname = attrname.to_s.chomp( '?' ) attr_writer( attrname ) attr_predicate( attrname ) end
Create an method that is both a reader and a writer for an instance variable. If called with a (non-nil) argument, it will set the variable to the new value. It returns whatever the instance variable is set to.
# File lib/arborist/mixins.rb, line 92 def dsl_accessor( attrname ) define_method( attrname ) do |arg=nil| instance_variable_set( "@#{attrname}", arg ) unless arg.nil? return instance_variable_get( "@#{attrname}" ) end end
Creates readers and writers that allow assignment to the attributes of the singleton of the declaring object that correspond to the specified symbols
.
# File lib/arborist/mixins.rb, line 51 def singleton_attr_accessor( *symbols ) symbols.each do |sym| singleton_class.__send__( :attr_accessor, sym ) end end
Creates instance variables and corresponding methods that return their values for each of the specified symbols
in the singleton of the declaring object (e.g., class instance variables and methods if declared in a Class).
# File lib/arborist/mixins.rb, line 26 def singleton_attr_reader( *symbols ) singleton_class.instance_exec( symbols ) do |attrs| attr_reader( *attrs ) end end
Creates methods that allow assignment to the attributes of the singleton of the declaring object that correspond to the specified symbols
.
# File lib/arborist/mixins.rb, line 42 def singleton_attr_writer( *symbols ) singleton_class.instance_exec( symbols ) do |attrs| attr_writer( *attrs ) end end
Creates an alias for the original
method named newname
.
# File lib/arborist/mixins.rb, line 66 def singleton_method_alias( newname, original ) singleton_class.__send__( :alias_method, newname, original ) end
Create predicate methods and writers that allow assignment to the attributes of the singleton of the declaring object that correspond to the specified symbols
.
# File lib/arborist/mixins.rb, line 60 def singleton_predicate_accessor( *symbols ) singleton_class.extend( Arborist::MethodUtilities ) singleton_class.attr_predicate_accessor( *symbols ) end
Create instance variables and corresponding methods that return true or false values for each of the specified symbols
in the singleton of the declaring object.
# File lib/arborist/mixins.rb, line 35 def singleton_predicate_reader( *symbols ) singleton_class.extend( Arborist::MethodUtilities ) singleton_class.attr_predicate( *symbols ) end