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Contents
# -*- coding: utf-8 -*-
module Xot
module ConstSymbolAccessor
def const_symbol_accessor (name, **symbol2const)
const_symbol_writer name, **symbol2const
const_symbol_reader name, **symbol2const
end
def const_symbol_writer (name, **symbol2const)
writer = "#{name}=".intern
setter = "cs_set_#{name}__".intern
alias_method setter, writer
private setter
define_method writer do |symbol|
const = symbol2const[symbol]
raise ArgumentError unless const
__send__ setter, const
end
name
end
def const_symbol_reader (name, **symbol2const)
reader = name.intern
getter = "cs_get_#{name}__".intern
alias_method getter, reader
private getter
const2symbol = symbol2const.reduce({}) {|h, (k, v)| h[v] = k; h}
define_method reader do
const = __send__ getter
symbol = const2symbol[const]
raise "'#{const}' is unknown value." unless symbol
symbol
end
name
end
end# ConstSymbolAccessor
end# Xot
class Module
include Xot::ConstSymbolAccessor
end# Module
Version data entries
7 entries across 7 versions & 1 rubygems