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Contents
require 'facet/kernel/instance_assign'
require 'facet/kernel/assign_from'
module Kernel
# Set setter methods and/or vars using a hash (or assoc array).
# #assign_with is a meta-programming method, which allows you to
# use a hash to do any kind of variable assignment and/or setting:
#
# For example, assuming that there is an accessor defined as <tt>d</tt>:
#
# assign_with( '@a'=>1, '@@b'=>2, '$c'=>3, 'd'=>4 )
# @a #=> 1
# @@b #=> 2
# $c #=> 3
# d #=> 4
#
# Note that while the global variable is strictly unnecessary,
# it works for completeness sake.
#
#--
# TODO This proabably should be called instance_assign_with given
# it's nature. Maybe consider that in the future.
#
# TODO Maybe assign_with should only handle instance vars, like
# assign from does. Then another method could do what this now does.
# Say instance_assign could be extended to handle a hash.
#
# TODO Make a little more flexiable to allow any hash-like object.
#++
def assign_with(*args)
harg = args.last.is_a?(Hash) ? args.pop : {}
unless args.empty?
# if not assoc array, eg. [ [], [], ... ]
# preserves order of opertation
unless args[0].is_a?(Array)
i = 0; a = []
while i < args.size
a << [ args[i], args[i+1] ]
i += 2
end
args = a
end
end
args.each do |k,v|
instance_assign( k, v )
end
harg.each do |k,v|
instance_assign( k, v )
end
return self
end
end
# _____ _
# |_ _|__ ___| |_
# | |/ _ \/ __| __|
# | | __/\__ \ |_
# |_|\___||___/\__|
#
=begin test
require 'test/unit'
class TCKernel < Test::Unit::TestCase
def test_assign_with
ahash = { "z"=>0, "@a"=>1, "@b"=>2 } #, "@@a"=>3 }
assign_with( ahash )
assert_equal( 0, @z )
assert_equal( 1, @a )
assert_equal( 2, @b )
#assert_equal( 3, @@a )
end
end
=end
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13 entries across 13 versions & 1 rubygems