module Invokable::Closure::ClassMethods
Public Instance Methods
arity()
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Return the “total” arity of the class (i.e. the arity of the initializer and the arity of the call method)
@version 0.5.0 @see ruby-doc.org/core-2.7.1/Proc.html#method-i-arity Proc#arity @see initializer_arity
@return [Integer]
# File lib/invokable/closure.rb, line 23 def arity initializer_arity + instance_method(:call).arity end
call(*args)
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Handle automatic currying–will accept either the initializer arity or the total arity of the class. If the initializer arity is used return a class instance. If the total arity is used instantiate the class and return the results of the `call` method.
@version 0.5.0 @see arity @see initializer_arity
# File lib/invokable/closure.rb, line 44 def call(*args) if args.length == initializer_arity new(*args) elsif args.length == arity init_args = args.slice(0, initializer_arity) call_args = args.slice(initializer_arity, args.length) new(*init_args).call(*call_args) else raise ArgumentError, "wrong number of arguments (given #{args.length}, expected #{initializer_arity} or #{arity})" end end
enclose(*names, &block)
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Specify any enclosed state with a block or named attributes
@example
class TwitterPater include Invokable::Command enclose :api_key def call(user) # interact with twitter, return results end end TwitterPater.new(API_KEY).call(User.find(1)) TwitterPater.new(API_KEY).api_key == API_KEY # => true class TwitterPater include Invokable::Command enclose do |api_key| @api_key = api_key end def call(user) # interact with twitter, return results end end TwitterPater.new(API_KEY).call(User.find(1)) TwitterPater.new(API_KEY).api_key # error 'method' missing
# File lib/invokable/closure.rb, line 86 def enclose(*names, &block) return define_initializer_with_block(block) unless block.nil? define_initializer_with_names(names) end
initializer_arity()
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Return the arity of the initializer
@version 0.5.0 @see arity
@return [Integer]
# File lib/invokable/closure.rb, line 33 def initializer_arity instance_method(:initialize).arity end
Private Instance Methods
define_initializer_with_block(block)
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# File lib/invokable/closure.rb, line 94 def define_initializer_with_block(block) @initializer = block define_method :initialize, &block end
define_initializer_with_names(names)
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# File lib/invokable/closure.rb, line 99 def define_initializer_with_names(names) @initializer_arity = names.length names.each do |name| attr_reader name end define_method :initialize do |*args| names.each_with_index do |name, i| instance_variable_set(:"@#{name}", args[i]) end end end