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# frozen_string_literal: true
module Bundler
module VersionRanges
NEq = Struct.new(:version)
ReqR = Struct.new(:left, :right)
class ReqR
Endpoint = Struct.new(:version, :inclusive)
def to_s
"#{left.inclusive ? "[" : "("}#{left.version}, #{right.version}#{right.inclusive ? "]" : ")"}"
end
INFINITY = Object.new.freeze
ZERO = Gem::Version.new("0.a")
def cover?(v)
return false if left.inclusive && left.version > v
return false if !left.inclusive && left.version >= v
if right.version != INFINITY
return false if right.inclusive && right.version < v
return false if !right.inclusive && right.version <= v
end
true
end
def empty?
left.version == right.version && !(left.inclusive && right.inclusive)
end
def single?
left.version == right.version
end
UNIVERSAL = ReqR.new(ReqR::Endpoint.new(Gem::Version.new("0.a"), true), ReqR::Endpoint.new(ReqR::INFINITY, false)).freeze
end
def self.for_many(requirements)
requirements = requirements.map(&:requirements).flatten(1).map {|r| r.join(" ") }
requirements << ">= 0.a" if requirements.empty?
requirement = Gem::Requirement.new(requirements)
self.for(requirement)
end
def self.for(requirement)
ranges = requirement.requirements.map do |op, v|
case op
when "=" then ReqR.new(ReqR::Endpoint.new(v, true), ReqR::Endpoint.new(v, true))
when "!=" then NEq.new(v)
when ">=" then ReqR.new(ReqR::Endpoint.new(v, true), ReqR::Endpoint.new(ReqR::INFINITY, false))
when ">" then ReqR.new(ReqR::Endpoint.new(v, false), ReqR::Endpoint.new(ReqR::INFINITY, false))
when "<" then ReqR.new(ReqR::Endpoint.new(ReqR::ZERO, true), ReqR::Endpoint.new(v, false))
when "<=" then ReqR.new(ReqR::Endpoint.new(ReqR::ZERO, true), ReqR::Endpoint.new(v, true))
when "~>" then ReqR.new(ReqR::Endpoint.new(v, true), ReqR::Endpoint.new(v.bump, false))
else raise "unknown version op #{op} in requirement #{requirement}"
end
end.uniq
ranges, neqs = ranges.partition {|r| !r.is_a?(NEq) }
[ranges.sort_by {|range| [range.left.version, range.left.inclusive ? 0 : 1] }, neqs.map(&:version)]
end
def self.empty?(ranges, neqs)
!ranges.reduce(ReqR::UNIVERSAL) do |last_range, curr_range|
next false unless last_range
next false if curr_range.single? && neqs.include?(curr_range.left.version)
next curr_range if last_range.right.version == ReqR::INFINITY
case last_range.right.version <=> curr_range.left.version
when 1 then next curr_range
when 0 then next(last_range.right.inclusive && curr_range.left.inclusive && !neqs.include?(curr_range.left.version) && curr_range)
when -1 then next false
end
end
end
end
end