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require 'semantic_puppet/dependency'
module SemanticPuppet
module Dependency
class Graph
include GraphNode
attr_reader :modules
# Create a new instance of a dependency graph.
#
# @param modules [{String => VersionRange}] the required module
# set and their version constraints
def initialize(modules = {})
@modules = modules.keys
modules.each do |name, range|
add_constraint('initialize', name, range.to_s) do |node|
range === node.version
end
add_dependency(name)
end
end
# Constrains graph solutions based on the given block. Graph constraints
# are used to describe fundamental truths about the tooling or module
# system (e.g.: module names contain a namespace component which is
# dropped during install, so module names must be unique excluding the
# namespace).
#
# @example Ensuring a single source for all modules
# @graph.add_constraint('installed', mod.name) do |nodes|
# nodes.count { |node| node.source } == 1
# end
#
# @see #considering_solution?
#
# @param source [String, Symbol] a name describing the source of the
# constraint
# @yieldparam nodes [Array<GraphNode>] the nodes to test the constraint
# against
# @yieldreturn [Boolean] whether the node passed the constraint
# @return [void]
def add_graph_constraint(source, &block)
constraints[:graph] << [ source, block ]
end
# Checks the proposed solution (or partial solution) against the graph's
# constraints.
#
# @see #add_graph_constraint
#
# @return [Boolean] true if none of the graph constraints are violated
def satisfies_graph?(solution)
constraints[:graph].all? { |_, check| check[solution] }
end
end
end
end
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