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Edit File : resolver.rb \| Size : 14.20 KB
# frozen_string_literal: true module Bundler class Resolver require "bundler/vendored_molinillo" require "bundler/resolver/spec_group" # Figures out the best possible configuration of gems that satisfies # the list of passed dependencies and any child dependencies without # causing any gem activation errors. # # ==== Parameters # dependencies<Gem::Dependency>:: The list of dependencies to resolve # # ==== Returns # <GemBundle>,nil:: If the list of dependencies can be resolved, a # collection of gemspecs is returned. Otherwise, nil is returned. def self.resolve(requirements, index, source_requirements = {}, base = [], gem_version_promoter = GemVersionPromoter.new, additional_base_requirements = [], platforms = nil) platforms = Set.new(platforms) if platforms base = SpecSet.new(base) unless base.is_a?(SpecSet) resolver = new(index, source_requirements, base, gem_version_promoter, additional_base_requirements, platforms) result = resolver.start(requirements) SpecSet.new(result) end def initialize(index, source_requirements, base, gem_version_promoter, additional_base_requirements, platforms) @index = index @source_requirements = source_requirements @base = base @resolver = Molinillo::Resolver.new(self, self) @search_for = {} @base_dg = Molinillo::DependencyGraph.new @base.each do \|ls\| dep = Dependency.new(ls.name, ls.version) @base_dg.add_vertex(ls.name, DepProxy.new(dep, ls.platform), true) end additional_base_requirements.each {\|d\| @base_dg.add_vertex(d.name, d) } @platforms = platforms @gem_version_promoter = gem_version_promoter @allow_bundler_dependency_conflicts = Bundler.feature_flag.allow_bundler_dependency_conflicts? @lockfile_uses_separate_rubygems_sources = Bundler.feature_flag.lockfile_uses_separate_rubygems_sources? @use_gvp = Bundler.feature_flag.use_gem_version_promoter_for_major_updates? \|\| !@gem_version_promoter.major? end def start(requirements) @gem_version_promoter.prerelease_specified = @prerelease_specified = {} requirements.each {\|dep\| @prerelease_specified[dep.name] \|\|= dep.prerelease? } verify_gemfile_dependencies_are_found!(requirements) dg = @resolver.resolve(requirements, @base_dg) dg.map(&:payload). reject {\|sg\| sg.name.end_with?("\0") }. map(&:to_specs).flatten rescue Molinillo::VersionConflict => e message = version_conflict_message(e) raise VersionConflict.new(e.conflicts.keys.uniq, message) rescue Molinillo::CircularDependencyError => e names = e.dependencies.sort_by(&:name).map {\|d\| "gem '#{d.name}'" } raise CyclicDependencyError, "Your bundle requires gems that depend" \ " on each other, creating an infinite loop. Please remove" \ " #{names.count > 1 ? "either " : ""}#{names.join(" or ")}" \ " and try again." end include Molinillo::UI # Conveys debug information to the user. # # @param [Integer] depth the current depth of the resolution process. # @return [void] def debug(depth = 0) return unless debug? debug_info = yield debug_info = debug_info.inspect unless debug_info.is_a?(String) STDERR.puts debug_info.split("\n").map {\|s\| " " depth + s } end def debug? return @debug_mode if defined?(@debug_mode) @debug_mode = ENV["DEBUG_RESOLVER"] \|\| ENV["DEBUG_RESOLVER_TREE"] \|\| false end def before_resolution Bundler.ui.info "Resolving dependencies...", debug? end def after_resolution Bundler.ui.info "" end def indicate_progress Bundler.ui.info ".", false unless debug? end include Molinillo::SpecificationProvider def dependencies_for(specification) specification.dependencies_for_activated_platforms end def search_for(dependency) platform = dependency.__platform dependency = dependency.dep unless dependency.is_a? Gem::Dependency search = @search_for[dependency] \|\|= begin index = index_for(dependency) results = index.search(dependency, @base[dependency.name]) if vertex = @base_dg.vertex_named(dependency.name) locked_requirement = vertex.payload.requirement end if !@prerelease_specified[dependency.name] && (!@use_gvp \|\| locked_requirement.nil?) # Move prereleases to the beginning of the list, so they're considered # last during resolution. pre, results = results.partition {\|spec\| spec.version.prerelease? } results = pre + results end spec_groups = if results.any? nested = [] results.each do \|spec\| version, specs = nested.last if version == spec.version specs << spec else nested << [spec.version, [spec]] end end nested.reduce([]) do \|groups, (version, specs)\| next groups if locked_requirement && !locked_requirement.satisfied_by?(version) spec_group = SpecGroup.new(specs) spec_group.ignores_bundler_dependencies = @allow_bundler_dependency_conflicts groups << spec_group end else [] end # GVP handles major itself, but it's still a bit risky to trust it with it # until we get it settled with new behavior. For 2.x it can take over all cases. if !@use_gvp spec_groups else @gem_version_promoter.sort_versions(dependency, spec_groups) end end search.select {\|sg\| sg.for?(platform) }.each {\|sg\| sg.activate_platform!(platform) } end def index_for(dependency) source = @source_requirements[dependency.name] if source source.specs elsif @lockfile_uses_separate_rubygems_sources Index.build do \|idx\| if dependency.all_sources dependency.all_sources.each {\|s\| idx.add_source(s.specs) if s } else idx.add_source @source_requirements[:default].specs end end else @index end end def name_for(dependency) dependency.name end def name_for_explicit_dependency_source Bundler.default_gemfile.basename.to_s rescue "Gemfile" end def name_for_locking_dependency_source Bundler.default_lockfile.basename.to_s rescue "Gemfile.lock" end def requirement_satisfied_by?(requirement, activated, spec) return false unless requirement.matches_spec?(spec) \|\| spec.source.is_a?(Source::Gemspec) spec.activate_platform!(requirement.__platform) if !@platforms \|\| @platforms.include?(requirement.__platform) true end def relevant_sources_for_vertex(vertex) if vertex.root? [@source_requirements[vertex.name]] elsif @lockfile_uses_separate_rubygems_sources vertex.recursive_predecessors.map do \|v\| @source_requirements[v.name] end << @source_requirements[:default] end end def sort_dependencies(dependencies, activated, conflicts) dependencies.sort_by do \|dependency\| dependency.all_sources = relevant_sources_for_vertex(activated.vertex_named(dependency.name)) name = name_for(dependency) vertex = activated.vertex_named(name) [ @base_dg.vertex_named(name) ? 0 : 1, vertex.payload ? 0 : 1, vertex.root? ? 0 : 1, amount_constrained(dependency), conflicts[name] ? 0 : 1, vertex.payload ? 0 : search_for(dependency).count, self.class.platform_sort_key(dependency.__platform), ] end end # Sort platforms from most general to most specific def self.sort_platforms(platforms) platforms.sort_by do \|platform\| platform_sort_key(platform) end end def self.platform_sort_key(platform) return ["", "", ""] if Gem::Platform::RUBY == platform platform.to_a.map {\|part\| part \|\| "" } end private # returns an integer \in (-\infty, 0] # a number closer to 0 means the dependency is less constraining # # dependencies w/ 0 or 1 possibilities (ignoring version requirements) # are given very negative values, so they _always_ sort first, # before dependencies that are unconstrained def amount_constrained(dependency) @amount_constrained \|\|= {} @amount_constrained[dependency.name] \|\|= begin if (base = @base[dependency.name]) && !base.empty? dependency.requirement.satisfied_by?(base.first.version) ? 0 : 1 else all = index_for(dependency).search(dependency.name).size if all <= 1 all - 1_000_000 else search = search_for(dependency) search = @prerelease_specified[dependency.name] ? search.count : search.count {\|s\| !s.version.prerelease? } search - all end end end end def verify_gemfile_dependencies_are_found!(requirements) requirements.each do \|requirement\| name = requirement.name next if name == "bundler" next unless search_for(requirement).empty? cache_message = begin " or in gems cached in #{Bundler.settings.app_cache_path}" if Bundler.app_cache.exist? rescue GemfileNotFound nil end if (base = @base[name]) && !base.empty? version = base.first.version message = "You have requested:\n" \ " #{name} #{requirement.requirement}\n\n" \ "The bundle currently has #{name} locked at #{version}.\n" \ "Try running `bundle update #{name}`\n\n" \ "If you are updating multiple gems in your Gemfile at once,\n" \ "try passing them all to `bundle update`" elsif source = @source_requirements[name] specs = source.specs[name] versions_with_platforms = specs.map {\|s\| [s.version, s.platform] } message = String.new("Could not find gem '#{SharedHelpers.pretty_dependency(requirement)}' in #{source}#{cache_message}.\n") message << if versions_with_platforms.any? "The source contains '#{name}' at: #{formatted_versions_with_platforms(versions_with_platforms)}" else "The source does not contain any versions of '#{name}'" end else message = "Could not find gem '#{requirement}' in any of the gem sources " \ "listed in your Gemfile#{cache_message}." end raise GemNotFound, message end end def formatted_versions_with_platforms(versions_with_platforms) version_platform_strs = versions_with_platforms.map do \|vwp\| version = vwp.first platform = vwp.last version_platform_str = String.new(version.to_s) version_platform_str << " #{platform}" unless platform.nil? \|\| platform == Gem::Platform::RUBY version_platform_str end version_platform_strs.join(", ") end def version_conflict_message(e) e.message_with_trees( :solver_name => "Bundler", :possibility_type => "gem", :reduce_trees => lambda do \|trees\| # called first, because we want to reduce the amount of work required to find maximal empty sets trees = trees.uniq {\|t\| t.flatten.map {\|dep\| [dep.name, dep.requirement] } } # bail out if tree size is too big for Array#combination to make any sense return trees if trees.size > 15 maximal = 1.upto(trees.size).map do \|size\| trees.map(&:last).flatten(1).combination(size).to_a end.flatten(1).select do \|deps\| Bundler::VersionRanges.empty?(Bundler::VersionRanges.for_many(deps.map(&:requirement))) end.min_by(&:size) trees.reject! {\|t\| !maximal.include?(t.last) } if maximal trees = trees.sort_by {\|t\| t.flatten.map(&:to_s) } trees.uniq! {\|t\| t.flatten.map {\|dep\| [dep.name, dep.requirement] } } trees.sort_by {\|t\| t.reverse.map(&:name) } end, :printable_requirement => lambda {\|req\| SharedHelpers.pretty_dependency(req) }, :additional_message_for_conflict => lambda do \|o, name, conflict\| if name == "bundler" o << %(\n Current Bundler version:\n bundler (#{Bundler::VERSION})) other_bundler_required = !conflict.requirement.requirement.satisfied_by?(Gem::Version.new Bundler::VERSION) end if name == "bundler" && other_bundler_required o << "\n" o << "This Gemfile requires a different version of Bundler.\n" o << "Perhaps you need to update Bundler by running `gem install bundler`?\n" end if conflict.locked_requirement o << "\n" o << %(Running `bundle update` will rebuild your snapshot from scratch, using only\n) o << %(the gems in your Gemfile, which may resolve the conflict.\n) elsif !conflict.existing o << "\n" relevant_sources = if conflict.requirement.source [conflict.requirement.source] elsif conflict.requirement.all_sources conflict.requirement.all_sources elsif @lockfile_uses_separate_rubygems_sources # every conflict should have an explicit group of sources when we # enforce strict pinning raise "no source set for #{conflict}" else [] end.compact.map(&:to_s).uniq.sort o << "Could not find gem '#{SharedHelpers.pretty_dependency(conflict.requirement)}'" if conflict.requirement_trees.first.size > 1 o << ", which is required by " o << "gem '#{SharedHelpers.pretty_dependency(conflict.requirement_trees.first[-2])}'," end o << " " o << if relevant_sources.empty? "in any of the sources.\n" else "in any of the relevant sources:\n #{relevant_sources "\n "}\n" end end end, :version_for_spec => lambda {\|spec\| spec.version } ) end end end Back

Edit File : resolver.rb | Size : 14.20 KB

# frozen_string_literal: true

module Bundler
  class Resolver
    require "bundler/vendored_molinillo"
    require "bundler/resolver/spec_group"

# Figures out the best possible configuration of gems that satisfies
    # the list of passed dependencies and any child dependencies without
    # causing any gem activation errors.
    #
    # ==== Parameters
    # *dependencies<Gem::Dependency>:: The list of dependencies to resolve
    #
    # ==== Returns
    # <GemBundle>,nil:: If the list of dependencies can be resolved, a
    #   collection of gemspecs is returned. Otherwise, nil is returned.
    def self.resolve(requirements, index, source_requirements = {}, base = [], gem_version_promoter = GemVersionPromoter.new, additional_base_requirements = [], platforms = nil)
      platforms = Set.new(platforms) if platforms
      base = SpecSet.new(base) unless base.is_a?(SpecSet)
      resolver = new(index, source_requirements, base, gem_version_promoter, additional_base_requirements, platforms)
      result = resolver.start(requirements)
      SpecSet.new(result)
    end

def initialize(index, source_requirements, base, gem_version_promoter, additional_base_requirements, platforms)
      @index = index
      @source_requirements = source_requirements
      @base = base
      @resolver = Molinillo::Resolver.new(self, self)
      @search_for = {}
      @base_dg = Molinillo::DependencyGraph.new
      @base.each do |ls|
        dep = Dependency.new(ls.name, ls.version)
        @base_dg.add_vertex(ls.name, DepProxy.new(dep, ls.platform), true)
      end
      additional_base_requirements.each {|d| @base_dg.add_vertex(d.name, d) }
      @platforms = platforms
      @gem_version_promoter = gem_version_promoter
      @allow_bundler_dependency_conflicts = Bundler.feature_flag.allow_bundler_dependency_conflicts?
      @lockfile_uses_separate_rubygems_sources = Bundler.feature_flag.lockfile_uses_separate_rubygems_sources?
      @use_gvp = Bundler.feature_flag.use_gem_version_promoter_for_major_updates? || !@gem_version_promoter.major?
    end

def start(requirements)
      @gem_version_promoter.prerelease_specified = @prerelease_specified = {}
      requirements.each {|dep| @prerelease_specified[dep.name] ||= dep.prerelease? }

verify_gemfile_dependencies_are_found!(requirements)
      dg = @resolver.resolve(requirements, @base_dg)
      dg.map(&:payload).
        reject {|sg| sg.name.end_with?("\0") }.
        map(&:to_specs).flatten
    rescue Molinillo::VersionConflict => e
      message = version_conflict_message(e)
      raise VersionConflict.new(e.conflicts.keys.uniq, message)
    rescue Molinillo::CircularDependencyError => e
      names = e.dependencies.sort_by(&:name).map {|d| "gem '#{d.name}'" }
      raise CyclicDependencyError, "Your bundle requires gems that depend" \
        " on each other, creating an infinite loop. Please remove" \
        " #{names.count > 1 ? "either " : ""}#{names.join(" or ")}" \
        " and try again."
    end

include Molinillo::UI

# Conveys debug information to the user.
    #
    # @param [Integer] depth the current depth of the resolution process.
    # @return [void]
    def debug(depth = 0)
      return unless debug?
      debug_info = yield
      debug_info = debug_info.inspect unless debug_info.is_a?(String)
      STDERR.puts debug_info.split("\n").map {|s| "  " * depth + s }
    end

def debug?
      return @debug_mode if defined?(@debug_mode)
      @debug_mode = ENV["DEBUG_RESOLVER"] || ENV["DEBUG_RESOLVER_TREE"] || false
    end

def before_resolution
      Bundler.ui.info "Resolving dependencies...", debug?
    end

def after_resolution
      Bundler.ui.info ""
    end

def indicate_progress
      Bundler.ui.info ".", false unless debug?
    end

include Molinillo::SpecificationProvider

def dependencies_for(specification)
      specification.dependencies_for_activated_platforms
    end

def search_for(dependency)
      platform = dependency.__platform
      dependency = dependency.dep unless dependency.is_a? Gem::Dependency
      search = @search_for[dependency] ||= begin
        index = index_for(dependency)
        results = index.search(dependency, @base[dependency.name])

if vertex = @base_dg.vertex_named(dependency.name)
          locked_requirement = vertex.payload.requirement
        end

if !@prerelease_specified[dependency.name] && (!@use_gvp || locked_requirement.nil?)
          # Move prereleases to the beginning of the list, so they're considered
          # last during resolution.
          pre, results = results.partition {|spec| spec.version.prerelease? }
          results = pre + results
        end

spec_groups = if results.any?
          nested = []
          results.each do |spec|
            version, specs = nested.last
            if version == spec.version
              specs << spec
            else
              nested << [spec.version, [spec]]
            end
          end
          nested.reduce([]) do |groups, (version, specs)|
            next groups if locked_requirement && !locked_requirement.satisfied_by?(version)
            spec_group = SpecGroup.new(specs)
            spec_group.ignores_bundler_dependencies = @allow_bundler_dependency_conflicts
            groups << spec_group
          end
        else
          []
        end
        # GVP handles major itself, but it's still a bit risky to trust it with it
        # until we get it settled with new behavior. For 2.x it can take over all cases.
        if !@use_gvp
          spec_groups
        else
          @gem_version_promoter.sort_versions(dependency, spec_groups)
        end
      end
      search.select {|sg| sg.for?(platform) }.each {|sg| sg.activate_platform!(platform) }
    end

def index_for(dependency)
      source = @source_requirements[dependency.name]
      if source
        source.specs
      elsif @lockfile_uses_separate_rubygems_sources
        Index.build do |idx|
          if dependency.all_sources
            dependency.all_sources.each {|s| idx.add_source(s.specs) if s }
          else
            idx.add_source @source_requirements[:default].specs
          end
        end
      else
        @index
      end
    end

def name_for(dependency)
      dependency.name
    end

def name_for_explicit_dependency_source
      Bundler.default_gemfile.basename.to_s
    rescue
      "Gemfile"
    end

def name_for_locking_dependency_source
      Bundler.default_lockfile.basename.to_s
    rescue
      "Gemfile.lock"
    end

def requirement_satisfied_by?(requirement, activated, spec)
      return false unless requirement.matches_spec?(spec) || spec.source.is_a?(Source::Gemspec)
      spec.activate_platform!(requirement.__platform) if !@platforms || @platforms.include?(requirement.__platform)
      true
    end

def relevant_sources_for_vertex(vertex)
      if vertex.root?
        [@source_requirements[vertex.name]]
      elsif @lockfile_uses_separate_rubygems_sources
        vertex.recursive_predecessors.map do |v|
          @source_requirements[v.name]
        end << @source_requirements[:default]
      end
    end

def sort_dependencies(dependencies, activated, conflicts)
      dependencies.sort_by do |dependency|
        dependency.all_sources = relevant_sources_for_vertex(activated.vertex_named(dependency.name))
        name = name_for(dependency)
        vertex = activated.vertex_named(name)
        [
          @base_dg.vertex_named(name) ? 0 : 1,
          vertex.payload ? 0 : 1,
          vertex.root? ? 0 : 1,
          amount_constrained(dependency),
          conflicts[name] ? 0 : 1,
          vertex.payload ? 0 : search_for(dependency).count,
          self.class.platform_sort_key(dependency.__platform),
        ]
      end
    end

# Sort platforms from most general to most specific
    def self.sort_platforms(platforms)
      platforms.sort_by do |platform|
        platform_sort_key(platform)
      end
    end

def self.platform_sort_key(platform)
      return ["", "", ""] if Gem::Platform::RUBY == platform
      platform.to_a.map {|part| part || "" }
    end

private

# returns an integer \in (-\infty, 0]
    # a number closer to 0 means the dependency is less constraining
    #
    # dependencies w/ 0 or 1 possibilities (ignoring version requirements)
    # are given very negative values, so they _always_ sort first,
    # before dependencies that are unconstrained
    def amount_constrained(dependency)
      @amount_constrained ||= {}
      @amount_constrained[dependency.name] ||= begin
        if (base = @base[dependency.name]) && !base.empty?
          dependency.requirement.satisfied_by?(base.first.version) ? 0 : 1
        else
          all = index_for(dependency).search(dependency.name).size

if all <= 1
            all - 1_000_000
          else
            search = search_for(dependency)
            search = @prerelease_specified[dependency.name] ? search.count : search.count {|s| !s.version.prerelease? }
            search - all
          end
        end
      end
    end

def verify_gemfile_dependencies_are_found!(requirements)
      requirements.each do |requirement|
        name = requirement.name
        next if name == "bundler"
        next unless search_for(requirement).empty?

cache_message = begin
                            " or in gems cached in #{Bundler.settings.app_cache_path}" if Bundler.app_cache.exist?
                          rescue GemfileNotFound
                            nil
                          end

if (base = @base[name]) && !base.empty?
          version = base.first.version
          message = "You have requested:\n" \
            "  #{name} #{requirement.requirement}\n\n" \
            "The bundle currently has #{name} locked at #{version}.\n" \
            "Try running `bundle update #{name}`\n\n" \
            "If you are updating multiple gems in your Gemfile at once,\n" \
            "try passing them all to `bundle update`"
        elsif source = @source_requirements[name]
          specs = source.specs[name]
          versions_with_platforms = specs.map {|s| [s.version, s.platform] }
          message = String.new("Could not find gem '#{SharedHelpers.pretty_dependency(requirement)}' in #{source}#{cache_message}.\n")
          message << if versions_with_platforms.any?
                       "The source contains '#{name}' at: #{formatted_versions_with_platforms(versions_with_platforms)}"
                     else
                       "The source does not contain any versions of '#{name}'"
                     end
        else
          message = "Could not find gem '#{requirement}' in any of the gem sources " \
            "listed in your Gemfile#{cache_message}."
        end
        raise GemNotFound, message
      end
    end

def formatted_versions_with_platforms(versions_with_platforms)
      version_platform_strs = versions_with_platforms.map do |vwp|
        version = vwp.first
        platform = vwp.last
        version_platform_str = String.new(version.to_s)
        version_platform_str << " #{platform}" unless platform.nil? || platform == Gem::Platform::RUBY
        version_platform_str
      end
      version_platform_strs.join(", ")
    end

def version_conflict_message(e)
      e.message_with_trees(
        :solver_name => "Bundler",
        :possibility_type => "gem",
        :reduce_trees => lambda do |trees|
          # called first, because we want to reduce the amount of work required to find maximal empty sets
          trees = trees.uniq {|t| t.flatten.map {|dep| [dep.name, dep.requirement] } }

# bail out if tree size is too big for Array#combination to make any sense
          return trees if trees.size > 15
          maximal = 1.upto(trees.size).map do |size|
            trees.map(&:last).flatten(1).combination(size).to_a
          end.flatten(1).select do |deps|
            Bundler::VersionRanges.empty?(*Bundler::VersionRanges.for_many(deps.map(&:requirement)))
          end.min_by(&:size)
          trees.reject! {|t| !maximal.include?(t.last) } if maximal

trees = trees.sort_by {|t| t.flatten.map(&:to_s) }
          trees.uniq! {|t| t.flatten.map {|dep| [dep.name, dep.requirement] } }

trees.sort_by {|t| t.reverse.map(&:name) }
        end,
        :printable_requirement => lambda {|req| SharedHelpers.pretty_dependency(req) },
        :additional_message_for_conflict => lambda do |o, name, conflict|
          if name == "bundler"
            o << %(\n  Current Bundler version:\n    bundler (#{Bundler::VERSION}))
            other_bundler_required = !conflict.requirement.requirement.satisfied_by?(Gem::Version.new Bundler::VERSION)
          end

if name == "bundler" && other_bundler_required
            o << "\n"
            o << "This Gemfile requires a different version of Bundler.\n"
            o << "Perhaps you need to update Bundler by running `gem install bundler`?\n"
          end
          if conflict.locked_requirement
            o << "\n"
            o << %(Running `bundle update` will rebuild your snapshot from scratch, using only\n)
            o << %(the gems in your Gemfile, which may resolve the conflict.\n)
          elsif !conflict.existing
            o << "\n"

relevant_sources = if conflict.requirement.source
              [conflict.requirement.source]
            elsif conflict.requirement.all_sources
              conflict.requirement.all_sources
            elsif @lockfile_uses_separate_rubygems_sources
              # every conflict should have an explicit group of sources when we
              # enforce strict pinning
              raise "no source set for #{conflict}"
            else
              []
            end.compact.map(&:to_s).uniq.sort

o << "Could not find gem '#{SharedHelpers.pretty_dependency(conflict.requirement)}'"
            if conflict.requirement_trees.first.size > 1
              o << ", which is required by "
              o << "gem '#{SharedHelpers.pretty_dependency(conflict.requirement_trees.first[-2])}',"
            end
            o << " "

o << if relevant_sources.empty?
                   "in any of the sources.\n"
                 else
                   "in any of the relevant sources:\n  #{relevant_sources * "\n  "}\n"
                 end
          end
        end,
        :version_for_spec => lambda {|spec| spec.version }
      )
    end
  end
end

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