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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) do
def <=>(other)
if version.equal?(INFINITY)
return 0 if other.version.equal?(INFINITY)
return 1
elsif other.version.equal?(INFINITY)
return -1
end
comp = version <=> other.version
return comp unless comp.zero?
if inclusive && !other.inclusive
1
elsif !inclusive && other.inclusive
-1
else
0
end
end
end
def to_s
"#{left.inclusive ? "[" : "("}#{left.version}, #{right.version}#{right.inclusive ? "]" : ")"}"
end
INFINITY = begin
inf = Object.new
def inf.to_s
"∞"
end
def inf.<=>(other)
return 0 if other.equal?(self)
1
end
inf.freeze
end
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
def <=>(other)
return -1 if other.equal?(INFINITY)
comp = left <=> other.left
return comp unless comp.zero?
right <=> other.right
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, 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
# higher
when 1 then next ReqR.new(curr_range.left, last_range.right)
# equal
when 0
if last_range.right.inclusive && curr_range.left.inclusive && !neqs.include?(curr_range.left.version)
ReqR.new(curr_range.left, [curr_range.right, last_range.right].max)
end
# lower
when -1 then next false
end
end
end
end
end