Class: Bundler::Resolver

# File 'lib/bundler/resolver.rb', line 217

def debug?
  ENV["BUNDLER_DEBUG_RESOLVER"] ||
    ENV["BUNDLER_DEBUG_RESOLVER_TREE"] ||
    ENV["DEBUG_RESOLVER"] ||
    ENV["DEBUG_RESOLVER_TREE"] ||
    false
end

# File 'lib/bundler/resolver.rb', line 628

def apply_metadata_overrides(dependencies, name)
  return dependencies if @base.overrides.empty?

  dependencies.map do |dep|
    field = METADATA_DEP_FIELD[dep.name]
    next dep unless field
    override = Override.find_for(@base.overrides, name, field)
    next dep unless override
    Gem::Dependency.new(dep.name, override.apply_to(dep.requirement))
  end
end

# File 'lib/bundler/resolver.rb', line 613

def apply_overrides(dependencies)
  return dependencies if @base.overrides.empty?

  dependencies.map do |dep|
    override = Override.find_for(@base.overrides, dep.name, :version)
    next dep unless override
    Gem::Dependency.new(dep.name, override.apply_to(dep.requirement))
  end
end

# File 'lib/bundler/resolver.rb', line 522

def base_requirements
  @base.base_requirements
end

# File 'lib/bundler/resolver.rb', line 640

def bundler_not_found_message(conflict_dependencies)
  candidate_specs = filter_matching_specs(default_bundler_source.specs.search("bundler"), conflict_dependencies)

  if candidate_specs.any?
    target_version = candidate_specs.last.version
    new_command = [File.basename($PROGRAM_NAME), "_#{target_version}_", *ARGV].join(" ")
    "Your bundle requires a different version of Bundler than the one you're running.\n" \
    "Install the necessary version with `gem install bundler:#{target_version}` and rerun bundler using `#{new_command}`\n"
  else
    "Your bundle requires a different version of Bundler than the one you're running, and that version could not be found.\n"
  end
end

# File 'lib/bundler/resolver.rb', line 460

def cooldown_excluded?(spec)
  return false unless spec.respond_to?(:created_at) && spec.created_at
  return false unless spec.respond_to?(:remote) && spec.remote
  return false if locked_by_lockfile?(spec)
  days = spec.remote.effective_cooldown
  return false if days.nil? || days <= 0
  (cooldown_now - spec.created_at) < (days * 86_400)
end

# File 'lib/bundler/resolver.rb', line 445

def cooldown_excluded_versions(specs)
  excluded = {}
  specs.each do |spec|
    next unless cooldown_excluded?(spec)
    excluded[[spec.name, spec.version]] = true
  end
  excluded
end

# File 'lib/bundler/resolver.rb', line 454

def cooldown_hint(specs)
  excluded_versions = cooldown_excluded_versions(specs)
  return nil if excluded_versions.empty?
  "#{excluded_versions.size} version#{"s" if excluded_versions.size > 1} excluded by the cooldown setting; pass `--cooldown 0` to bypass"
end

# File 'lib/bundler/resolver.rb', line 488

def cooldown_now
  @cooldown_now ||= Time.now
end

# File 'lib/bundler/resolver.rb', line 325

def default_bundler_source
  @source_requirements[:default_bundler]
end

# File 'lib/bundler/resolver.rb', line 438

def filter_cooldown(specs)
  return specs if specs.empty?
  excluded_versions = cooldown_excluded_versions(specs)
  return specs if excluded_versions.empty?
  specs.reject {|s| excluded_versions.include?([s.name, s.version]) }
end

# File 'lib/bundler/resolver.rb', line 508

def filter_invalid_self_dependencies(specs, name)
  specs.reject do |s|
    s.dependencies.any? {|d| d.name == name && !d.requirement.satisfied_by?(s.version) }
  end
end

# File 'lib/bundler/resolver.rb', line 422

def filter_matching_specs(specs, requirements)
  Array(requirements).flat_map do |requirement|
    specs.select {| spec| requirement_satisfied_by?(requirement, spec) }
  end
end

# File 'lib/bundler/resolver.rb', line 432

def filter_prereleases(specs, package)
  return specs unless package.ignores_prereleases? && specs.size > 1

  specs.reject {|s| s.version.prerelease? }
end

# File 'lib/bundler/resolver.rb', line 492

def filter_remote_specs(specs, package)
  if package.prefer_local?
    local_specs = specs.select {|s| s.is_a?(StubSpecification) }

    if local_specs.empty?
      package.consider_remote_versions!
      specs
    else
      local_specs
    end
  else
    specs
  end
end

# File 'lib/bundler/resolver.rb', line 428

def filter_specs(specs, package)
  filter_remote_specs(filter_cooldown(filter_prereleases(specs, package)), package)
end

# File 'lib/bundler/resolver.rb', line 407

def filtered_versions_for(package)
  @gem_version_promoter.filter_versions(package, @all_versions[package])
end

# File 'lib/bundler/resolver.rb', line 145

def find_names_to_relax(incompatibility)
  names_to_unlock = []
  names_to_allow_prereleases_for = []
  names_to_allow_remote_specs_for = []
  extended_explanation = nil

  while incompatibility.conflict?
    cause = incompatibility.cause
    incompatibility = cause.incompatibility

    incompatibility.terms.each do |term|
      package = term.package
      name = package.name

      if base_requirements[name]
        names_to_unlock << name
      elsif package.ignores_prereleases? && @all_specs[name].any? {|s| s.version.prerelease? }
        names_to_allow_prereleases_for << name
      elsif package.prefer_local? && @all_specs[name].any? {|s| !s.is_a?(StubSpecification) }
        names_to_allow_remote_specs_for << name
      end

      no_versions_incompat = [cause.incompatibility, cause.satisfier].find {|incompat| incompat.cause.is_a?(PubGrub::Incompatibility::NoVersions) }
      next unless no_versions_incompat

      extended_explanation = no_versions_incompat.extended_explanation
    end
  end

  [names_to_unlock.uniq, names_to_allow_prereleases_for.uniq, names_to_allow_remote_specs_for.uniq, extended_explanation]
end

# File 'lib/bundler/resolver.rb', line 225

def incompatibilities_for(package, version)
  package_deps = @cached_dependencies[package]
  sorted_versions = @sorted_versions[package]
  package_deps[version].map do |dep_package, dep_constraint|
    low = high = sorted_versions.index(version)

    # find version low such that all >= low share the same dep
    while low > 0 && package_deps[sorted_versions[low - 1]][dep_package] == dep_constraint
      low -= 1
    end
    low =
      if low == 0
        nil
      else
        sorted_versions[low]
      end

    # find version high such that all < high share the same dep
    while high < sorted_versions.length && package_deps[sorted_versions[high]][dep_package] == dep_constraint
      high += 1
    end
    high =
      if high == sorted_versions.length
        nil
      else
        sorted_versions[high]
      end

    range = PubGrub::VersionRange.new(min: low, max: high, include_min: !low.nil?)

    self_constraint = PubGrub::VersionConstraint.new(package, range: range)

    dep_term = PubGrub::Term.new(dep_constraint, false)
    self_term = PubGrub::Term.new(self_constraint, true)

    custom_explanation = if dep_package.meta? && package.root?
      "current #{dep_package} version is #{dep_constraint.constraint_string}"
    end

    PubGrub::Incompatibility.new([self_term, dep_term], cause: :dependency, custom_explanation: custom_explanation)
  end
end

# File 'lib/bundler/resolver.rb', line 482

def locked_by_lockfile?(spec)
  return false unless defined?(@base) && @base
  return false if @base.explicitly_unlocked?(spec.name)
  @base.locked_specs[spec.name].any? {|locked| locked.version == spec.version }
end

# File 'lib/bundler/resolver.rb', line 333

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

# File 'lib/bundler/resolver.rb', line 191

def no_versions_incompatibility_for(package, unsatisfied_term)
  cause = PubGrub::Incompatibility::NoVersions.new(unsatisfied_term)
  name = package.name
  constraint = unsatisfied_term.constraint
  constraint_string = constraint.constraint_string
  requirements = constraint_string.split(" OR ").map {|req| Gem::Requirement.new(req.split(",")) }

  if name == "bundler" && bundler_pinned_to_current_version?
    custom_explanation = "the current Bundler version (#{Bundler::VERSION}) does not satisfy #{constraint}"
    extended_explanation = bundler_not_found_message(requirements)
  else
    specs_matching_other_platforms = filter_matching_specs(@all_specs[name], requirements)

    platforms_explanation = specs_matching_other_platforms.any? ? " for any resolution platforms (#{package.platforms.join(", ")})" : ""
    custom_explanation = "#{constraint} could not be found in #{repository_for(package)}#{platforms_explanation}"
    if hint = cooldown_hint(specs_matching_other_platforms)
      custom_explanation += " (#{hint})"
    end

    label = "#{name} (#{constraint_string})"
    extended_explanation = other_specs_matching_message(specs_matching_other_platforms, label) if specs_matching_other_platforms.any?
  end

  Incompatibility.new([unsatisfied_term], cause: cause, custom_explanation: custom_explanation, extended_explanation: extended_explanation)
end

# File 'lib/bundler/resolver.rb', line 560

def other_specs_matching_message(specs, requirement)
  message = String.new("The source contains the following gems matching '#{requirement}':\n")
  message << specs.map {|s| "  * #{s.full_name}" }.join("\n")
  message
end

# File 'lib/bundler/resolver.rb', line 132

def override_diagnostic_summary
  return nil if @base.overrides.empty?

  lines = ["Bundler applied the following overrides while resolving:"]
  @base.overrides.each do |override|
    target = override.target == :all ? ":all" : override.target.inspect
    location = override.source_location_label
    lines << "  override #{target}, #{override.field}: #{override.operation.inspect}" \
      "#{location ? " (declared at #{location})" : ""}"
  end
  "\n\n#{lines.join("\n")}"
end

# File 'lib/bundler/resolver.rb', line 177

def parse_dependency(package, dependency)
  range = if repository_for(package).is_a?(Source::Gemspec)
    PubGrub::VersionRange.any
  else
    requirement_to_range(dependency)
  end

  PubGrub::VersionConstraint.new(package, range: range)
end

# File 'lib/bundler/resolver.rb', line 393

def platform_mismatch_hint
  locked_platforms = Bundler.locked_gems&.platforms
  return unless locked_platforms

  local_platform = Bundler.local_platform
  return if locked_platforms.include?(local_platform)
  return if locked_platforms.any? {|p| p == Gem::Platform::RUBY }

  "Your current platform (#{local_platform}) is not included in the lockfile's platforms (#{locked_platforms.join(", ")}). " \
    "Add the current platform to the lockfile with\n`bundle lock --add-platform #{local_platform}` and try again."
rescue GemfileNotFound
  nil
end

# File 'lib/bundler/resolver.rb', line 526

def prepare_dependencies(requirements, packages)
  to_dependency_hash(requirements, packages).filter_map do |dep_package, dep_constraint|
    name = dep_package.name

    next [dep_package, dep_constraint] if name == "bundler"

    dep_range = dep_constraint.range
    versions = versions_for(dep_package, dep_range)
    if versions.empty?
      if dep_package.ignores_prereleases? || dep_package.prefer_local?
        @all_versions.delete(dep_package)
        @sorted_versions.delete(dep_package)
      end
      dep_package.consider_prereleases! if dep_package.ignores_prereleases?
      dep_package.consider_remote_versions! if dep_package.prefer_local?
      versions = versions_for(dep_package, dep_range)
    end

    if versions.empty? && select_all_versions(dep_package, dep_range).any?
      raise_all_versions_filtered_out!(dep_package)
    end

    next [dep_package, dep_constraint] unless versions.empty?

    next unless dep_package.current_platform?

    raise_not_found!(dep_package)
  end.to_h
end

# File 'lib/bundler/resolver.rb', line 411

def raise_all_versions_filtered_out!(package)
  level = @gem_version_promoter.level
  name = package.name
  locked_version = package.locked_version
  requirement = package.dependency

  raise GemNotFound,
    "#{name} is locked to #{locked_version}, while Gemfile is requesting #{requirement}. " \
    "--strict --#{level} was specified, but there are no #{level} level upgrades from #{locked_version} satisfying #{requirement}, so version solving has failed"
end

# File 'lib/bundler/resolver.rb', line 339

def raise_incomplete!(incomplete_specs)
  raise_not_found!(@base.get_package(incomplete_specs.first.name))
end

# File 'lib/bundler/resolver.rb', line 349

def raise_not_found!(package)
  name = package.name
  source = source_for(name)
  specs = @all_specs[name]
  matching_part = name
  requirement_label = SharedHelpers.pretty_dependency(package.dependency)
  cache_message = begin
                      " or in gems cached in #{Bundler.settings.app_cache_path}" if Bundler.app_cache.exist?
                    rescue GemfileNotFound
                      nil
                    end
  specs_matching_requirement = filter_matching_specs(specs, package.dependency.requirement)

  not_found_message = if specs_matching_requirement.any?
    specs = specs_matching_requirement
    matching_part = requirement_label
    platforms = package.platforms

    if platforms.size == 1
      "Could not find gem '#{requirement_label}' with platform '#{platforms.first}'"
    else
      "Could not find gems matching '#{requirement_label}' valid for all resolution platforms (#{platforms.join(", ")})"
    end
  else
    "Could not find gem '#{requirement_label}'"
  end

  message = String.new("#{not_found_message} in #{source}#{cache_message}.\n")

  if specs.any?
    message << "\n#{other_specs_matching_message(specs, matching_part)}"
  end

  if hint = cooldown_hint(specs_matching_requirement)
    message << "\n\n#{hint}."
  end

  if specs_matching_requirement.any? && (hint = platform_mismatch_hint)
    message << "\n\n#{hint}"
  end

  raise GemNotFound, message
end

# File 'lib/bundler/resolver.rb', line 518

def repository_for(package)
  source_for(package.name)
end

# File 'lib/bundler/resolver.rb', line 514

def requirement_satisfied_by?(requirement, spec)
  requirement.satisfied_by?(spec.version) || spec.source.is_a?(Source::Gemspec)
end

# File 'lib/bundler/resolver.rb', line 566

def requirement_to_range(requirement)
  ranges = requirement.requirements.map do |(op, version)|
    ver = Resolver::Candidate.new(version, priority: -1)
    platform_ver = Resolver::Candidate.new(version, priority: 1)

    case op
    when "~>"
      name = "~> #{ver}"
      bump = Resolver::Candidate.new(version.bump.to_s + ".A")
      PubGrub::VersionRange.new(name: name, min: ver, max: bump, include_min: true)
    when ">"
      PubGrub::VersionRange.new(min: platform_ver)
    when ">="
      PubGrub::VersionRange.new(min: ver, include_min: true)
    when "<"
      PubGrub::VersionRange.new(max: ver)
    when "<="
      PubGrub::VersionRange.new(max: platform_ver, include_max: true)
    when "="
      PubGrub::VersionRange.new(min: ver, max: platform_ver, include_min: true, include_max: true)
    when "!="
      PubGrub::VersionRange.new(min: ver, max: platform_ver, include_min: true, include_max: true).invert
    else
      raise "bad version specifier: #{op}"
    end
  end

  ranges.inject(&:intersect)
end

# File 'lib/bundler/resolver.rb', line 556

def select_all_versions(package, range)
  range.select_versions(@all_versions[package])
end

# File 'lib/bundler/resolver.rb', line 35

def setup_solver
  root = Resolver::Root.new(name_for_explicit_dependency_source)
  root_version = Resolver::Candidate.new(0)

  @all_specs = Hash.new do |specs, name|
    source = source_for(name)
    matches = source.specs.search(name)

    # Don't bother to check for circular deps when no dependency API are
    # available, since it's too slow to be usable. That edge case won't work
    # but resolution other than that should work fine and reasonably fast.
    if source.respond_to?(:dependency_api_available?) && source.dependency_api_available?
      matches = filter_invalid_self_dependencies(matches, name)
    end

    specs[name] = matches.sort_by {|s| [s.version, s.platform.to_s] }
  end

  @all_versions = Hash.new do |candidates, package|
    candidates[package] = all_versions_for(package)
  end

  @sorted_versions = Hash.new do |candidates, package|
    candidates[package] = filtered_versions_for(package).sort
  end

  @sorted_versions[root] = [root_version]

  root_dependencies = prepare_dependencies(@requirements, @packages)

  @cached_dependencies = Hash.new do |dependencies, package|
    dependencies[package] = Hash.new do |versions, version|
      deps = version.dependencies.reject {|d| d.name == package.name }
      deps = apply_metadata_overrides(deps, package.name)
      versions[version] = to_dependency_hash(deps, @packages)
    end
  end

  @cached_dependencies[root] = { root_version => root_dependencies }

  logger = Bundler::UI::Shell.new
  logger.level = debug? ? "debug" : "warn"

  [root, logger]
end

# File 'lib/bundler/resolver.rb', line 81

def solve_versions(root:, logger:)
  solver = PubGrub::VersionSolver.new(source: self, root: root, strategy: Strategy.new(self), logger: logger)
  result = solver.solve
  resolved_specs = result.flat_map {|package, version| version.to_specs(package, @most_specific_locked_platform) }
  Override.attach(resolved_specs, @base.overrides)
  SpecSet.new(resolved_specs).specs_with_additional_variants_from(@base.locked_specs)
rescue PubGrub::SolveFailure => e
  incompatibility = e.incompatibility

  names_to_unlock, names_to_allow_prereleases_for, names_to_allow_remote_specs_for, extended_explanation = find_names_to_relax(incompatibility)

  names_to_relax = names_to_unlock + names_to_allow_prereleases_for + names_to_allow_remote_specs_for

  if names_to_relax.any?
    if names_to_unlock.any?
      Bundler.ui.debug "Found conflicts with locked dependencies. Will retry with #{names_to_unlock.join(", ")} unlocked...", true

      @base.unlock_names(names_to_unlock)
    end

    if names_to_allow_prereleases_for.any?
      Bundler.ui.debug "Found conflicts with dependencies with prereleases. Will retry considering prereleases for #{names_to_allow_prereleases_for.join(", ")}...", true

      @base.include_prereleases(names_to_allow_prereleases_for)
    end

    if names_to_allow_remote_specs_for.any?
      Bundler.ui.debug "Found conflicts with local versions of #{names_to_allow_remote_specs_for.join(", ")}. Will retry considering remote versions...", true

      @base.include_remote_specs(names_to_allow_remote_specs_for)
    end

    root, logger = setup_solver

    Bundler.ui.debug "Retrying resolution...", true
    retry
  end

  explanation = e.message

  if extended_explanation
    explanation << "\n\n"
    explanation << extended_explanation
  end

  override_summary = override_diagnostic_summary
  explanation << override_summary if override_summary

  raise SolveFailure.new(explanation)
end

# File 'lib/bundler/resolver.rb', line 343

def sort_versions_by_preferred(package, versions)
  @gem_version_promoter.sort_versions(package, versions)
end

# File 'lib/bundler/resolver.rb', line 321

def source_for(name)
  @source_requirements[name] || @source_requirements[:default]
end

# File 'lib/bundler/resolver.rb', line 24

def start
  @requirements = @base.requirements
  @packages = @base.packages

  root, logger = setup_solver

  Bundler.ui.info "Resolving dependencies...", true

  solve_versions(root: root, logger: logger)
end

# File 'lib/bundler/resolver.rb', line 596

def to_dependency_hash(dependencies, packages)
  apply_overrides(dependencies).inject({}) do |deps, dep|
    package = packages[dep.name]

    current_req = deps[package]
    new_req = parse_dependency(package, dep.requirement)

    deps[package] = if current_req
      current_req.intersect(new_req)
    else
      new_req
    end

    deps
  end
end

# File 'lib/bundler/resolver.rb', line 187

def versions_for(package, range = VersionRange.any)
  range.select_versions(@sorted_versions[package])
end