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Contents
require 'ludy/kernel/public_send'
module Ludy
# someone who does the pattern matching thing
# see Kernel#defun
class PatternMatcher
# init for the first parameter
def initialize args, &fun; @params = [[args, fun]]; end
# find the first match of this arguments. notice,
# this is not the best match. maybe someday i could
# implement the match policy accordingly or selectable policy.
def first_match args
@params.find{ |parameters, fun|
match? parameters, args
}.ergo.last
end
# delegate all the rest message to @params array
def method_missing msg, *args, &block
if @params.respond_to? msg
@params.public_send msg, *args, &block
else
raise NoMethodError.new("PatternMatcher doesn't respond to #{msg}")
end
end
private
def match? parameters, arguments
return false unless parameters.size == arguments.size
parameters.zip(arguments).each{ |param, arg|
if param.kind_of? Class
return false unless arg.kind_of?(param)
else
return false unless arg == param
end
}
return true
end
end
end # of Ludy
Version data entries
14 entries across 14 versions & 2 rubygems