Sha256: cd05aabbb82128bb568b495dc4a6dc281afb0a91c54c34363ac614c7b33b0375
Contents?: true
Size: 1.37 KB
Versions: 27
Compression:
Stored size: 1.37 KB
Contents
module Kernel
# simple (sequential) enumerated values
# usage :
#
# module Constants
# module Gradient
# enum :B, :A, :C
# end
# end
#
# then :
#
# puts Constants::Gradient::B -> 0
# puts Constants::Gradient::C -> 2
# puts Constants::Gradient::MINVALUE -> 0
# puts Constants::Gradient::MAXVALUE -> 2
# puts Constants::Gradient::NAMES -> [:B, :A, :C]
# puts Constants::Gradient[0] -> :B
# puts Constants::Gradient[1] -> :A
# puts Constants::Gradient[2] -> :C
def enum(*syms)
syms.each_index { |i|
const_set(syms[i], i)
}
const_set(:NAMES, syms || [])
const_set(:MINVALUE, syms==nil ? nil : 0)
const_set(:MAXVALUE, syms==nil ? nil : syms.length-1)
const_set(:VALUECOUNT, syms==nil ? nil : syms.length)
const_set(:ALL, syms==nil ? [] : (0..syms.length-1).to_a)
const_set(:HUMAN_NAMES, syms.map{|n| n.to_s.humanize} || [])
# this returns the enum name given the value
def self.[]( idx )
(idx.is_a? Integer) ? const_get(:NAMES)[idx] : nil
end
def self.valid?(idx)
(idx.is_a? Integer) && (idx >= 0) && (idx <= const_get(:MAXVALUE))
end
def self.parse(name,default=nil)
return default if name.nil? || name.empty?
return default if not name = name.to_sym
result = const_get(:NAMES).index(name)
return result==nil ? default : result
end
end
end
Version data entries
27 entries across 27 versions & 4 rubygems