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module Solve
module Errors
class SolveError < StandardError
alias_method :mesage, :to_s
end
class EngineNotAvailable < SolveError
end
class InvalidEngine < SolveError
end
class NoSolutionError < SolveError
# Artifacts that don't exist at any version but are required for a valid
# solution
# @return [Array<String>] Missing artifact names
attr_reader :missing_artifacts
# Constraints that eliminate all versions of an artifact, e.g. you ask
# for mysql >= 2.0.0 but only 1.0.0 exists.
# @return [Array<String>] Invalid constraints as strings
attr_reader :constraints_excluding_all_artifacts
# A demand that has conflicting dependencies
# @return [String] the unsatisfiable demand
attr_reader :unsatisfiable_demand
# The artifact for which there are conflicting dependencies
# @return [Array<String>] The "most constrained" artifacts
attr_reader :artifacts_with_no_satisfactory_version
# @param [#to_s] message
# @option causes [Array<String>] :missing_artifacts ([])
# @option causes [Array<String>] :constraints_excluding_all_artifacts ([])
# @option causes [#to_s] :unsatisfiable_demand (nil)
# @option causes [Array<String>] :artifacts_with_no_satisfactory_version ([])
def initialize(message = nil, causes = {})
super(message)
@message = message
@missing_artifacts = causes[:missing_artifacts] || []
@constraints_excluding_all_artifacts = causes[:constraints_excluding_all_artifacts] || []
@unsatisfiable_demand = causes[:unsatisfiable_demand] || nil
@artifacts_with_no_satisfactory_version = causes[:artifacts_with_no_satisfactory_version] || []
end
def to_s
s = ""
s << "#{@message}\n"
s << "Missing artifacts: #{missing_artifacts.join(",")}\n" unless missing_artifacts.empty?
unless constraints_excluding_all_artifacts.empty?
pretty = constraints_excluding_all_artifacts.map { |constraint| "(#{constraint[0]} #{constraint[1]})" }.join(",")
s << "Constraints that match no available version: #{pretty}\n"
end
s << "Demand that cannot be met: #{unsatisfiable_demand}\n" if unsatisfiable_demand
unless artifacts_with_no_satisfactory_version.empty?
s << "Artifacts for which there are conflicting dependencies: #{artifacts_with_no_satisfactory_version.join(",")}"
end
s
end
end
# Indicates that the solver could not find the conflicting constraints when
# solving the given demands and graph.
class NoSolutionCauseUnknown < NoSolutionError; end
class UnsortableSolutionError < SolveError
attr_reader :internal_exception
attr_reader :unsorted_solution
def initialize(internal_exception, unsorted_solution)
@internal_exception = internal_exception
@unsorted_solution = unsorted_solution
end
def to_s
"The solution contains a cycle and cannot be topologically sorted. See #unsorted_solution on this exception for the unsorted solution"
end
end
end
end
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