Keyword arguments support now!
You don't have to wait until Ruby 2.0 to get (named|keyword) arguments support. Arguments has been tested with Ruby 1.8.6 and ruby 1.9.1 and eventually will work with JRuby (if someone is interested in contributing, I guess is possible since merb-action-args works with JRuby)
require 'arguments' class Example def meth(a = :a, b = :b, c = :c) [a,b,c] end class << self def class_method(a = :a, b = :b, c = :c) [a,b,c] end def other_class_method(a = :a, b = :b, c = :c) [a,b,c] end named_args_for :class_method end named_args_for :meth, :'self.other_class_method' end nu = Example.new nu.meth #=> [:a,:b,:c] nu.meth(1, :c => ) #=> [1,:b,Class] nu.meth(:b => nil, :a => 'something') #=> ['something', nil, :c] Example.class_method(:b => nil, :a => 'something') #=> ['something', nil, :c] Example.other_class_method(:b => nil, :a => 'something') #=> ['something', nil, :c]
#named_arguments_for is aliased as #named_args_for and #named_args
Calling #named_args_for without arguments patches all previously declared methods in scope
Last Hash argument is used to assign argument values unless passing all accepted arguments:
nu.meth(1, :c => 'string') #=> [1, :b, 'string'] nu.meth(1, 2, :a => 'string') #=> [1, 2, => 'string']
Any number of method names (Symbol or String) corresponding to existing methods can be passed
Methods with no optionals won't be patched (will behave as usual with no named params)
Same for methods with splatted arguments and for native methods (not declared in Ruby)
Keyword argument take precedence over argument order:
nu.meth(10, :a => -10) #=> [-10, :b, :c]
pasing a key not corresponding to an argument name will raise ArgumentError:
nu.meth(10, :four => -10) #=> ArgumentError: `four` is not an argument name.
Performance penalty occurs only in 1.8.6 due to ParseTree use and only while calling Class#named_args_for, penalty while calling the actuall method is neglectable.
With Ruby 1.8.6 it can patch methods declared with eval, with 1.9.1 only methods declared in a source file.
ParseTree >= 3.0.3
RubyParser >= 2.0.2
sudo gem install maca-arguments –source http://gems.github.com
LATEST CHANGES (0.6)
Fixed a bug where converting a block to proc argument using ampersand would blow method call
Passing a keyword not corresponding to an argument name raises an error
Using RubyParser in Ruby 1.9.1 instead of Regexp to extract argument names and default values
Method definition that uses splat operator is now ignored
Last Hash argument is not used for assigning argument values if total number of arguments has been passed
named_arguments_for can be called passing a Class method name eg: named_args_for :instance_method, 'self.class_method'
(The MIT License)
Copyright © 2009 Macario Ortega
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