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Contents
# Copyright 2011-2012 Rice University. Licensed under the Affero General Public
# License version 3 or later. See the COPYRIGHT file for details.
# A class for enum values
#
# Usage:
# class SomeClass < OpenStax::Utilities::Enum
# SOME_CONSTANT = 0
# ANOTHER_CONSTANT = 1
# end
#
# Note: do not use the same value more than once,
# or else only the last occurrence will be used
# when searching by value.
module OpenStax
module Utilities
class Enum
# When given a numeric value, returns the constant name
# When given a name, returns the constant value
def self.[](val)
return self.constants.select{|c| self.const_get(c) == val}.last if val.is_a?(Numeric)
val_sym = val.to_s.gsub(" ", "_").to_sym.upcase
self.const_defined?(val_sym) ? self.const_get(val_sym) : \
(self.const_defined?(val_sym.capitalize) ? self.const_get(val_sym.capitalize) : \
raise(NameError.new("wrong enum name #{val.to_s}")))
end
# Humanized list of constants
def self.list
self.constants.collect{|c| c.to_s.humanize}
end
# List of constant values
def self.values
self.constants.collect{|c| self.const_get(c)}
end
# Options ready to be used in a select tag
def self.options
self.constants.collect{|c| [c.to_s.humanize, self.const_get(c)]}
end
end
end
end
Version data entries
31 entries across 31 versions & 1 rubygems