# frozen_string_literal: true
module Gem::Molinillo
# A state that a {Resolution} can be in
# @attr [String] name the name of the current requirement
# @attr [Array<Object>] requirements currently unsatisfied requirements
# @attr [DependencyGraph] activated the graph of activated dependencies
# @attr [Object] requirement the current requirement
# @attr [Object] possibilities the possibilities to satisfy the current requirement
# @attr [Integer] depth the depth of the resolution
# @attr [Hash] conflicts unresolved conflicts, indexed by dependency name
# @attr [Array<UnwindDetails>] unused_unwind_options unwinds for previous conflicts that weren't explored
ResolutionState = Struct.new(
:name,
:requirements,
:activated,
:requirement,
:possibilities,
:depth,
:conflicts,
:unused_unwind_options
)
class ResolutionState
# Returns an empty resolution state
# @return [ResolutionState] an empty state
def self.empty
new(nil, [], DependencyGraph.new, nil, nil, 0, {}, [])
end
end
# A state that encapsulates a set of {#requirements} with an {Array} of
# possibilities
class DependencyState < ResolutionState
# Removes a possibility from `self`
# @return [PossibilityState] a state with a single possibility,
# the possibility that was removed from `self`
def pop_possibility_state
PossibilityState.new(
name,
requirements.dup,
activated,
requirement,
[possibilities.pop],
depth + 1,
conflicts.dup,
unused_unwind_options.dup
).tap do |state|
state.activated.tag(state)
end
end
end
# A state that encapsulates a single possibility to fulfill the given
# {#requirement}
class PossibilityState < ResolutionState
end
end
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