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Contents
# TITLE:
#
# Kernel Constant
#
# DESCRIPTION:
#
# Get a constant. But more convenient than const_get.
#
module Kernel
# This is similar to +Module#const_get+ but is accessible at all levels,
# and, unlike +const_get+, can handle module hierarchy.
#
# constant("Fixnum") # -> Fixnum
# constant(:Fixnum) # -> Fixnum
#
# constant("Process::Sys") # -> Process::Sys
# constant("Regexp::MULTILINE") # -> 4
#
# require 'test/unit'
# Test.constant("Unit::Assertions") # -> Test::Unit::Assertions
# Test.constant("::Test::Unit") # -> Test::Unit
#
def constant(const)
const = const.to_s.dup
base = const.sub!(/^::/, '') ? Object : ( self.kind_of?(Module) ? self : self.class )
const.split(/::/).inject(base){ |mod, name| mod.const_get(name) }
end
end
# _____ _
# |_ _|__ ___| |_
# | |/ _ \/ __| __|
# | | __/\__ \ |_
# |_|\___||___/\__|
#
=begin test
require 'test/unit'
class TCKernel < Test::Unit::TestCase
def test_constant
c = ::Test::Unit::TestCase.name
assert_equal( ::Test::Unit::TestCase, constant(c) )
c = "Test::Unit::TestCase"
assert_equal( ::Test::Unit::TestCase, constant(c) )
c = "Unit::TestCase"
assert_equal( ::Test::Unit::TestCase, Test.constant(c) )
c = "TestCase"
assert_equal( ::Test::Unit::TestCase, Test::Unit.constant(c) )
end
end
=end
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10 entries across 10 versions & 1 rubygems