Sha256: 285bffb64ad2a7b0166e0fee84ffe20570f31a4f33c8a215ebefe733cbbc1cab
Contents?: true
Size: 1.95 KB
Versions: 10
Compression:
Stored size: 1.95 KB
Contents
# TITLE:
#
# Overload
#
# SUMMARY:
#
# Write methods with signitures.
#
# COPYRIGHT:
#
# Copyright (c) 2005 Thomas Sawyer
#
# LICENSE:
#
# Ruby License
#
# This module is free software. You may use, modify, and/or redistribute this
# software under the same terms as Ruby.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE.
#
# AUTHORS:
#
# - Thomas Sawyer
#
class Module
def method_overloads
@method_overloads ||= {}
end
# Overload methods.
#
# class X
# def x
# "hello"
# end
#
# overload :x, Integer do |i|
# i
# end
#
# overload :x, String, String do |s1, s2|
# [s1, s2]
# end
# end
def overload( name, *signiture, &block )
name = name.to_sym
if method_overloads.key?( name )
method_overloads[name][signiture] = block
else
method_overloads[name] = {}
method_overloads[name][signiture] = block
if method_defined?( name )
#method_overloads[name][nil] = instance_method( name ) #true
alias_method( "#{name}Generic", name )
has_generic = true
else
has_generic = false
end
define_method( name ) do |*args|
ovr = self.class.method_overloads["#{name}".to_sym]
sig = args.collect{ |a| a.class }
hit = nil
faces = ovr.keys.sort { |a,b| b.size <=> a.size }
faces.each do |cmp|
next unless cmp.size == sig.size
cmp.size.times { |i|
next unless cmp[i] < sig[i]
}
hit = cmp
end
if hit
ovr[hit].call(*args)
else
if has_generic #ovr[nil]
send( "#{name}Generic", *args )
#ovr[nil].bind(self).call(*args)
else
raise NoMethodError
end
end
end
end
end
end
Version data entries
10 entries across 10 versions & 1 rubygems