hashugar.rb

#!/usr/bin/env ruby
#
# https://github.com/jsuchal/hashugar
#
# MIT LICENSE
#
# Copyright (c) 2011 Sven Fuchs <svenfuchs@artweb-design.de>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

class Hashugar
  def initialize(hash)
    @table = {}
    @table_with_original_keys = {}
    hash.each_pair do |key, value|
      hashugar = value.to_hashugar
      @table_with_original_keys[key] = hashugar
      @table[stringify(key)] = hashugar
    end
  end

  def method_missing(method, *args, &_block)
    method = method.to_s
    if method.chomp!('=')
      @table[method] = args.first
    elsif @table.include? method
      @table[method]
    else
      raise KeyError, "unknown hash key: '#{method}'"
    end
  end

  def [](key)
    @table[stringify(key)]
  end

  def []=(key, value)
    @table[stringify(key)] = value
  end

  def respond_to?(key)
    super(key) || @table.key?(stringify(key))
  end

  def each(&block)
    @table_with_original_keys.each(&block)
  end

  def to_hash
    hash = @table_with_original_keys.to_hash
    hash.each do |key, value|
      hash[key] = value.to_hash if value.is_a?(Hashugar)
    end
  end

  def empty?
    @table.empty?
  end

  private

  def stringify(key)
    key.is_a?(Symbol) ? key.to_s : key
  end
end

class Hash
  def to_hashugar
    Hashugar.new(self)
  end
end

class Array
  def to_hashugar
    map(&:to_hashugar)
  end
end

class Object
  def to_hashugar
    self
  end
end