# Copyright, 2014, by Samuel G. D. Williams. <http://www.codeotaku.com>
# 
# 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.

require_relative 'list'

module Build
	module Files
		class Difference < List
			def initialize(list, excludes)
				@list = list
				@excludes = excludes
			end
			
			attr :files
			
			def freeze
				@list.freeze
				@excludes.freeze
				
				super
			end
			
			def each
				return to_enum(:each) unless block_given?
				
				@list.each do |path|
					yield path unless @excludes.include?(path)
				end
			end
			
			def -(list)
				self.class.new(@list, Composite.new(@excludes, list))
			end
			
			def include?(path)
				@list.includes?(path) and !@excludes.include?(path)
			end
			
			def rebase(root)
				self.class.new(@files.collect{|list| list.rebase(root)}, [root])
			end
			
			def inspect
				"<Difference #{@files.inspect} - #{@excludes.inspect}>"
			end
		end
	end
end