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# File 'lib/arguments/class.rb', line 2
def named_arguments_for *methods
methods = instance_methods - Object.methods if methods.empty?
methods.each do |meth|
meth = meth.to_s
klass = meth.sub!(/^self./, '') ? (class << self; self; end) : self
names = Arguments.names klass, meth
next if names.empty? or names.inject(false) { |bol, pair| bol || /^\*/ === pair.first.to_s }
assigns = []
names.pop if /^&/ === names[-1][0].to_s
names.each_with_index do |name, index|
unless name.size == 1
assigns << <<-RUBY_EVAL
#{ name.first } =
if opts.key? :#{ name.first }
opts.delete :#{ name.first }
else
args.size >= #{ index + 1 } ? args[#{ index }] : #{ name.last }
end
RUBY_EVAL
else
assigns << <<-RUBY_EVAL
begin
#{ name.first } = opts.key?(:#{ name.first }) ? opts.delete(:#{ name.first }) : args.fetch(#{ index })
rescue
raise ArgumentError.new('passing `#{ name.first }` is required')
end
RUBY_EVAL
end
end
klass.module_eval <<-RUBY_EVAL, __FILE__, __LINE__
def __#{ meth }_with_keyword_arguments *args, &block
opts = args.last.kind_of?( Hash ) && args.size < #{ names.size } ? args.pop : {}
#{ assigns.join("\n") }
unless opts.empty?
raise ArgumentError.new("`\#{ opts.keys.join(', ') }` \#{ opts.size == 1 ? 'is not a recognized argument keyword' : 'are not recognized argument keywords' }")
end
__original_#{ meth } #{ names.collect{ |n| n.first }.join(', ') }, &block
end
alias __original_#{ meth } #{ meth }
alias #{ meth } __#{ meth }_with_keyword_arguments
RUBY_EVAL
end
end
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