ioquatix/build-dependency

# Copyright, 2017, 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 'chain'

module Build
    module Dependency
        class Chain
            def partial(provider)
                PartialChain.expand(self, provider.dependencies)
            end
        end
        
        class PartialChain < Resolver
            # An `UnresolvedDependencyError` will be thrown if there are any unresolved dependencies.
            def self.expand(*args)
                chain = self.new(*args)
                
                chain.freeze
                
                return chain
            end
            
            def initialize(chain, dependencies)
                super()
                
                @chain = chain
                
                @dependencies = dependencies.collect{|dependency| Depends[dependency]}
                
                expand_top
            end
            
            def selection
                @chain.selection
            end
            
            # @attr [Array<Depends>] The list of dependencies that needs to be satisfied.
            attr :dependencies
            
            def providers
                @chain.providers
            end
            
            def freeze
                return unless frozen?
                
                @chain.freeze
                @dependencies.freeze
                
                super
            end
            
            protected
            
            def expand_top
                expand_nested(@dependencies, TOP)
            end
            
            def expand(dependency, parent)
                unless @dependencies.include?(dependency)
                    return if dependency.private?
                end
                
                super(dependency, parent)
            end
            
            def expand_dependency(dependency, parent)
                @chain.resolved[dependency]
            end
            
            def provision_for(provider, dependency)
                # @chain.resolved[provider] does work, but it points to the most recently added provision, but we want the provision related to the specific dependency.
                provider.provision_for(dependency)
            end
        end
    end
end