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Contents
# TITLE:
#
# HashBuilder
#
# DESCRIPTION:
#
# Build a hash programmatically via missing method calls.
#
# COPYRIGHT:
#
# Copyright (c) 2006 Thomas Sawyer
#
# LICENSE:
#
# Ruby License
#
# This module is free software. You may use, modify, and/or redistribute this
# software under the same terms as Ruby.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE.
#
# AUTHORS:
#
# - Thomas Sawyer
#
#
# TODO:
#
# - This does not currently use BuildingBlock. Fix.
# = HashBuilder
#
# Build a hash programmatically via missing method calls.
class HashBuilder
# Privatize a few Kernel methods that are most likely to clash,
# but arn't essential here. TODO Maybe more in this context?
alias :__class__ :class
private :class, :clone, :display, :type, :method, :to_a, :to_s
#private *instace_methods
def self.build( blockstr=nil, &block )
self.new.build( blockstr, &block ).to_h
end
def initialize( blockstr=nil, &block )
@hash = {}
@flag = {}
end
def build( blockstr=nil, &block )
raise "both string and block given" if blockstr and block_given?
if blockstr
instance_eval blockstr
else
instance_eval &block
end
self # or to_h ?
end
def to_h ; @hash ; end
def method_missing( sym, *args, &block )
sym = sym.to_s.downcase.chomp('=')
if @hash.key?(sym)
unless @flag[sym]
@hash[sym] = [ @hash[sym] ]
@flag[sym] = true
end
if block_given?
@hash[sym] << self.__class__.new( &block ).to_h
else
@hash[sym] << args[0]
end
else
if block_given?
@hash[sym] = self.__class__.new( &block ).to_h
else
@hash[sym] = args[0]
end
end
end
end
# Author:: Thomas Sawyer
# Copyright:: Copyright (c) 2006 Thomas Sawyer
# License:: Ruby License
Version data entries
13 entries across 13 versions & 1 rubygems