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module Bundler::PubGrub
class Strategy
def initialize(source)
@source = source
@root_package = Package.root
@root_version = Package.root_version
@version_indexes = Hash.new do |h,k|
if k == @root_package
h[k] = { @root_version => 0 }
else
h[k] = @source.all_versions_for(k).each.with_index.to_h
end
end
end
def next_package_and_version(unsatisfied)
package, range = next_term_to_try_from(unsatisfied)
[package, most_preferred_version_of(package, range)]
end
private
def most_preferred_version_of(package, range)
versions = @source.versions_for(package, range)
indexes = @version_indexes[package]
versions.min_by { |version| indexes[version] }
end
def next_term_to_try_from(unsatisfied)
unsatisfied.min_by do |package, range|
matching_versions = @source.versions_for(package, range)
higher_versions = @source.versions_for(package, range.upper_invert)
[matching_versions.count <= 1 ? 0 : 1, higher_versions.count]
end
end
end
end