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Edit File : resolver.rb \| Size : 9.64 KB
# frozen_string_literal: true require_relative "dependency" require_relative "exceptions" require_relative "util/list" ## # Given a set of Gem::Dependency objects as +needed+ and a way to query the # set of available specs via +set+, calculates a set of ActivationRequest # objects which indicate all the specs that should be activated to meet the # all the requirements. class Gem::Resolver require_relative "resolver/molinillo" ## # If the DEBUG_RESOLVER environment variable is set then debugging mode is # enabled for the resolver. This will display information about the state # of the resolver while a set of dependencies is being resolved. DEBUG_RESOLVER = !ENV["DEBUG_RESOLVER"].nil? ## # Set to true if all development dependencies should be considered. attr_accessor :development ## # Set to true if immediate development dependencies should be considered. attr_accessor :development_shallow ## # When true, no dependencies are looked up for requested gems. attr_accessor :ignore_dependencies ## # List of dependencies that could not be found in the configured sources. attr_reader :missing attr_reader :stats ## # Hash of gems to skip resolution. Keyed by gem name, with arrays of # gem specifications as values. attr_accessor :skip_gems ## # When a missing dependency, don't stop. Just go on and record what was # missing. attr_accessor :soft_missing ## # Combines +sets+ into a ComposedSet that allows specification lookup in a # uniform manner. If one of the +sets+ is itself a ComposedSet its sets are # flattened into the result ComposedSet. def self.compose_sets(sets) sets.compact! sets = sets.map do \|set\| case set when Gem::Resolver::BestSet then set when Gem::Resolver::ComposedSet then set.sets else set end end.flatten case sets.length when 0 then raise ArgumentError, "one set in the composition must be non-nil" when 1 then sets.first else Gem::Resolver::ComposedSet.new(sets) end end ## # Creates a Resolver that queries only against the already installed gems # for the +needed+ dependencies. def self.for_current_gems(needed) new needed, Gem::Resolver::CurrentSet.new end ## # Create Resolver object which will resolve the tree starting # with +needed+ Dependency objects. # # +set+ is an object that provides where to look for specifications to # satisfy the Dependencies. This defaults to IndexSet, which will query # rubygems.org. def initialize(needed, set = nil) @set = set \|\| Gem::Resolver::IndexSet.new @needed = needed @development = false @development_shallow = false @ignore_dependencies = false @missing = [] @skip_gems = {} @soft_missing = false @stats = Gem::Resolver::Stats.new end def explain(stage, *data) # :nodoc: return unless DEBUG_RESOLVER d = data.map {\|x\| x.pretty_inspect }.join(", ") $stderr.printf "%10s %s\n", stage.to_s.upcase, d end def explain_list(stage) # :nodoc: return unless DEBUG_RESOLVER data = yield $stderr.printf "%10s (%d entries)\n", stage.to_s.upcase, data.size unless data.empty? require "pp" PP.pp data, $stderr end end ## # Creates an ActivationRequest for the given +dep+ and the last +possible+ # specification. # # Returns the Specification and the ActivationRequest def activation_request(dep, possible) # :nodoc: spec = possible.pop explain :activate, [spec.full_name, possible.size] explain :possible, possible activation_request = Gem::Resolver::ActivationRequest.new spec, dep, possible return spec, activation_request end def requests(s, act, reqs=[]) # :nodoc: return reqs if @ignore_dependencies s.fetch_development_dependencies if @development s.dependencies.reverse_each do \|d\| next if d.type == :development && !@development next if d.type == :development && @development_shallow && act.development? next if d.type == :development && @development_shallow && act.parent reqs << Gem::Resolver::DependencyRequest.new(d, act) @stats.requirement! end @set.prefetch reqs @stats.record_requirements reqs reqs end include Molinillo::UI def output @output \|\|= debug? ? $stdout : File.open(IO::NULL, "w") end def debug? DEBUG_RESOLVER end include Molinillo::SpecificationProvider ## # Proceed with resolution! Returns an array of ActivationRequest objects. def resolve locking_dg = Molinillo::DependencyGraph.new Molinillo::Resolver.new(self, self).resolve(@needed.map {\|d\| DependencyRequest.new d, nil }, locking_dg).tsort.map(&:payload).compact rescue Molinillo::VersionConflict => e conflict = e.conflicts.values.first raise Gem::DependencyResolutionError, Conflict.new(conflict.requirement_trees.first.first, conflict.existing, conflict.requirement) ensure @output.close if defined?(@output) && !debug? end ## # Extracts the specifications that may be able to fulfill +dependency+ and # returns those that match the local platform and all those that match. def find_possible(dependency) # :nodoc: all = @set.find_all dependency if (skip_dep_gems = skip_gems[dependency.name]) && !skip_dep_gems.empty? matching = all.select do \|api_spec\| skip_dep_gems.any? {\|s\| api_spec.version == s.version } end all = matching unless matching.empty? end matching_platform = select_local_platforms all return matching_platform, all end ## # Returns the gems in +specs+ that match the local platform. def select_local_platforms(specs) # :nodoc: specs.select do \|spec\| Gem::Platform.installable? spec end end def search_for(dependency) possibles, all = find_possible(dependency) if !@soft_missing && possibles.empty? @missing << dependency exc = Gem::UnsatisfiableDependencyError.new dependency, all exc.errors = @set.errors raise exc end groups = Hash.new {\|hash, key\| hash[key] = [] } # create groups & sources in the same loop sources = possibles.map do \|spec\| source = spec.source groups[source] << spec source end.uniq.reverse activation_requests = [] sources.each do \|source\| groups[source]. sort_by {\|spec\| [spec.version, spec.platform =~ Gem::Platform.local ? 1 : 0] }. map {\|spec\| ActivationRequest.new spec, dependency }. each {\|activation_request\| activation_requests << activation_request } end activation_requests end def dependencies_for(specification) return [] if @ignore_dependencies spec = specification.spec requests(spec, specification) end def requirement_satisfied_by?(requirement, activated, spec) matches_spec = requirement.matches_spec? spec return matches_spec if @soft_missing matches_spec && spec.spec.required_ruby_version.satisfied_by?(Gem.ruby_version) && spec.spec.required_rubygems_version.satisfied_by?(Gem.rubygems_version) end def name_for(dependency) dependency.name end def allow_missing?(dependency) @missing << dependency @soft_missing end def sort_dependencies(dependencies, activated, conflicts) dependencies.sort_by.with_index do \|dependency, i\| name = name_for(dependency) [ activated.vertex_named(name).payload ? 0 : 1, amount_constrained(dependency), conflicts[name] ? 0 : 1, activated.vertex_named(name).payload ? 0 : search_for(dependency).count, i, # for stable sort ] end end SINGLE_POSSIBILITY_CONSTRAINT_PENALTY = 1_000_000 private_constant :SINGLE_POSSIBILITY_CONSTRAINT_PENALTY if defined?(private_constant) # 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 name_dependency = Gem::Dependency.new(dependency.name) dependency_request_for_name = Gem::Resolver::DependencyRequest.new(name_dependency, dependency.requester) all = @set.find_all(dependency_request_for_name).size if all <= 1 all - SINGLE_POSSIBILITY_CONSTRAINT_PENALTY else search = search_for(dependency).size search - all end end end private :amount_constrained end require_relative "resolver/activation_request" require_relative "resolver/conflict" require_relative "resolver/dependency_request" require_relative "resolver/requirement_list" require_relative "resolver/stats" require_relative "resolver/set" require_relative "resolver/api_set" require_relative "resolver/composed_set" require_relative "resolver/best_set" require_relative "resolver/current_set" require_relative "resolver/git_set" require_relative "resolver/index_set" require_relative "resolver/installer_set" require_relative "resolver/lock_set" require_relative "resolver/vendor_set" require_relative "resolver/source_set" require_relative "resolver/specification" require_relative "resolver/spec_specification" require_relative "resolver/api_specification" require_relative "resolver/git_specification" require_relative "resolver/index_specification" require_relative "resolver/installed_specification" require_relative "resolver/local_specification" require_relative "resolver/lock_specification" require_relative "resolver/vendor_specification" Back

Edit File : resolver.rb | Size : 9.64 KB

# frozen_string_literal: true
require_relative "dependency"
require_relative "exceptions"
require_relative "util/list"

##
# Given a set of Gem::Dependency objects as +needed+ and a way to query the
# set of available specs via +set+, calculates a set of ActivationRequest
# objects which indicate all the specs that should be activated to meet the
# all the requirements.

class Gem::Resolver
  require_relative "resolver/molinillo"

##
  # If the DEBUG_RESOLVER environment variable is set then debugging mode is
  # enabled for the resolver.  This will display information about the state
  # of the resolver while a set of dependencies is being resolved.

DEBUG_RESOLVER = !ENV["DEBUG_RESOLVER"].nil?

##
  # Set to true if all development dependencies should be considered.

attr_accessor :development

##
  # Set to true if immediate development dependencies should be considered.

attr_accessor :development_shallow

##
  # When true, no dependencies are looked up for requested gems.

attr_accessor :ignore_dependencies

##
  # List of dependencies that could not be found in the configured sources.

attr_reader :missing

attr_reader :stats

##
  # Hash of gems to skip resolution.  Keyed by gem name, with arrays of
  # gem specifications as values.

attr_accessor :skip_gems

##
  # When a missing dependency, don't stop. Just go on and record what was
  # missing.

attr_accessor :soft_missing

##
  # Combines +sets+ into a ComposedSet that allows specification lookup in a
  # uniform manner.  If one of the +sets+ is itself a ComposedSet its sets are
  # flattened into the result ComposedSet.

def self.compose_sets(*sets)
    sets.compact!

sets = sets.map do |set|
      case set
      when Gem::Resolver::BestSet then
        set
      when Gem::Resolver::ComposedSet then
        set.sets
      else
        set
      end
    end.flatten

case sets.length
    when 0 then
      raise ArgumentError, "one set in the composition must be non-nil"
    when 1 then
      sets.first
    else
      Gem::Resolver::ComposedSet.new(*sets)
    end
  end

##
  # Creates a Resolver that queries only against the already installed gems
  # for the +needed+ dependencies.

def self.for_current_gems(needed)
    new needed, Gem::Resolver::CurrentSet.new
  end

##
  # Create Resolver object which will resolve the tree starting
  # with +needed+ Dependency objects.
  #
  # +set+ is an object that provides where to look for specifications to
  # satisfy the Dependencies. This defaults to IndexSet, which will query
  # rubygems.org.

def initialize(needed, set = nil)
    @set = set || Gem::Resolver::IndexSet.new
    @needed = needed

@development         = false
    @development_shallow = false
    @ignore_dependencies = false
    @missing             = []
    @skip_gems           = {}
    @soft_missing        = false
    @stats               = Gem::Resolver::Stats.new
  end

def explain(stage, *data) # :nodoc:
    return unless DEBUG_RESOLVER

d = data.map {|x| x.pretty_inspect }.join(", ")
    $stderr.printf "%10s %s\n", stage.to_s.upcase, d
  end

def explain_list(stage) # :nodoc:
    return unless DEBUG_RESOLVER

data = yield
    $stderr.printf "%10s (%d entries)\n", stage.to_s.upcase, data.size
    unless data.empty?
      require "pp"
      PP.pp data, $stderr
    end
  end

##
  # Creates an ActivationRequest for the given +dep+ and the last +possible+
  # specification.
  #
  # Returns the Specification and the ActivationRequest

def activation_request(dep, possible) # :nodoc:
    spec = possible.pop

explain :activate, [spec.full_name, possible.size]
    explain :possible, possible

activation_request =
      Gem::Resolver::ActivationRequest.new spec, dep, possible

return spec, activation_request
  end

def requests(s, act, reqs=[]) # :nodoc:
    return reqs if @ignore_dependencies

s.fetch_development_dependencies if @development

s.dependencies.reverse_each do |d|
      next if d.type == :development && !@development
      next if d.type == :development && @development_shallow &&
              act.development?
      next if d.type == :development && @development_shallow &&
              act.parent

reqs << Gem::Resolver::DependencyRequest.new(d, act)
      @stats.requirement!
    end

@set.prefetch reqs

@stats.record_requirements reqs

reqs
  end

include Molinillo::UI

def output
    @output ||= debug? ? $stdout : File.open(IO::NULL, "w")
  end

def debug?
    DEBUG_RESOLVER
  end

include Molinillo::SpecificationProvider

##
  # Proceed with resolution! Returns an array of ActivationRequest objects.

def resolve
    locking_dg = Molinillo::DependencyGraph.new
    Molinillo::Resolver.new(self, self).resolve(@needed.map {|d| DependencyRequest.new d, nil }, locking_dg).tsort.map(&:payload).compact
  rescue Molinillo::VersionConflict => e
    conflict = e.conflicts.values.first
    raise Gem::DependencyResolutionError, Conflict.new(conflict.requirement_trees.first.first, conflict.existing, conflict.requirement)
  ensure
    @output.close if defined?(@output) && !debug?
  end

##
  # Extracts the specifications that may be able to fulfill +dependency+ and
  # returns those that match the local platform and all those that match.

def find_possible(dependency) # :nodoc:
    all = @set.find_all dependency

if (skip_dep_gems = skip_gems[dependency.name]) && !skip_dep_gems.empty?
      matching = all.select do |api_spec|
        skip_dep_gems.any? {|s| api_spec.version == s.version }
      end

all = matching unless matching.empty?
    end

matching_platform = select_local_platforms all

return matching_platform, all
  end

##
  # Returns the gems in +specs+ that match the local platform.

def select_local_platforms(specs) # :nodoc:
    specs.select do |spec|
      Gem::Platform.installable? spec
    end
  end

def search_for(dependency)
    possibles, all = find_possible(dependency)
    if !@soft_missing && possibles.empty?
      @missing << dependency
      exc = Gem::UnsatisfiableDependencyError.new dependency, all
      exc.errors = @set.errors
      raise exc
    end

groups = Hash.new {|hash, key| hash[key] = [] }

# create groups & sources in the same loop
    sources = possibles.map do |spec|
      source = spec.source
      groups[source] << spec
      source
    end.uniq.reverse

activation_requests = []

sources.each do |source|
      groups[source].
        sort_by {|spec| [spec.version, spec.platform =~ Gem::Platform.local ? 1 : 0] }.
        map {|spec| ActivationRequest.new spec, dependency }.
        each {|activation_request| activation_requests << activation_request }
    end

activation_requests
  end

def dependencies_for(specification)
    return [] if @ignore_dependencies
    spec = specification.spec
    requests(spec, specification)
  end

def requirement_satisfied_by?(requirement, activated, spec)
    matches_spec = requirement.matches_spec? spec
    return matches_spec if @soft_missing

matches_spec &&
      spec.spec.required_ruby_version.satisfied_by?(Gem.ruby_version) &&
      spec.spec.required_rubygems_version.satisfied_by?(Gem.rubygems_version)
  end

def name_for(dependency)
    dependency.name
  end

def allow_missing?(dependency)
    @missing << dependency
    @soft_missing
  end

def sort_dependencies(dependencies, activated, conflicts)
    dependencies.sort_by.with_index do |dependency, i|
      name = name_for(dependency)
      [
        activated.vertex_named(name).payload ? 0 : 1,
        amount_constrained(dependency),
        conflicts[name] ? 0 : 1,
        activated.vertex_named(name).payload ? 0 : search_for(dependency).count,
        i, # for stable sort
      ]
    end
  end

SINGLE_POSSIBILITY_CONSTRAINT_PENALTY = 1_000_000
  private_constant :SINGLE_POSSIBILITY_CONSTRAINT_PENALTY if defined?(private_constant)

# 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
      name_dependency = Gem::Dependency.new(dependency.name)
      dependency_request_for_name = Gem::Resolver::DependencyRequest.new(name_dependency, dependency.requester)
      all = @set.find_all(dependency_request_for_name).size

if all <= 1
        all - SINGLE_POSSIBILITY_CONSTRAINT_PENALTY
      else
        search = search_for(dependency).size
        search - all
      end
    end
  end
  private :amount_constrained
end

require_relative "resolver/activation_request"
require_relative "resolver/conflict"
require_relative "resolver/dependency_request"
require_relative "resolver/requirement_list"
require_relative "resolver/stats"

require_relative "resolver/set"
require_relative "resolver/api_set"
require_relative "resolver/composed_set"
require_relative "resolver/best_set"
require_relative "resolver/current_set"
require_relative "resolver/git_set"
require_relative "resolver/index_set"
require_relative "resolver/installer_set"
require_relative "resolver/lock_set"
require_relative "resolver/vendor_set"
require_relative "resolver/source_set"

require_relative "resolver/specification"
require_relative "resolver/spec_specification"
require_relative "resolver/api_specification"
require_relative "resolver/git_specification"
require_relative "resolver/index_specification"
require_relative "resolver/installed_specification"
require_relative "resolver/local_specification"
require_relative "resolver/lock_specification"
require_relative "resolver/vendor_specification"

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