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# frozen_string_literal: true
#--
# This file contains all the various exceptions and other errors that are used
# inside of RubyGems.
#
# DOC: Confirm _all_
#++

module Gem
  ##
  # Raised when RubyGems is unable to load or activate a gem.  Contains the
  # name and version requirements of the gem that either conflicts with
  # already activated gems or that RubyGems is otherwise unable to activate.

  class LoadError < ::LoadError
    # Name of gem
    attr_accessor :name

    # Version requirement of gem
    attr_accessor :requirement
  end

  ##
  # Raised when trying to activate a gem, and that gem does not exist on the
  # system.  Instead of rescuing from this class, make sure to rescue from the
  # superclass Gem::LoadError to catch all types of load errors.
  class MissingSpecError < Gem::LoadError
    def initialize(name, requirement, extra_message=nil)
      @name        = name
      @requirement = requirement
      @extra_message = extra_message
    end

    def message # :nodoc:
      build_message +
        "Checked in 'GEM_PATH=#{Gem.path.join(File::PATH_SEPARATOR)}' #{@extra_message}, execute `gem env` for more information"
    end

    private

    def build_message
      total = Gem::Specification.stubs.size
      "Could not find '#{name}' (#{requirement}) among #{total} total gem(s)\n"
    end
  end

  ##
  # Raised when trying to activate a gem, and the gem exists on the system, but
  # not the requested version. Instead of rescuing from this class, make sure to
  # rescue from the superclass Gem::LoadError to catch all types of load errors.
  class MissingSpecVersionError < MissingSpecError
    attr_reader :specs

    def initialize(name, requirement, specs)
      super(name, requirement)
      @specs = specs
    end

    private

    def build_message
      names = specs.map(&:full_name)
      "Could not find '#{name}' (#{requirement}) - did find: [#{names.join ','}]\n"
    end
  end

  # Raised when there are conflicting gem specs loaded

  class ConflictError < LoadError
    ##
    # A Hash mapping conflicting specifications to the dependencies that
    # caused the conflict

    attr_reader :conflicts

    ##
    # The specification that had the conflict

    attr_reader :target

    def initialize(target, conflicts)
      @target    = target
      @conflicts = conflicts
      @name      = target.name

      reason = conflicts.map do |act, dependencies|
        "#{act.full_name} conflicts with #{dependencies.join(", ")}"
      end.join ", "

      # TODO: improve message by saying who activated `con`

      super("Unable to activate #{target.full_name}, because #{reason}")
    end
  end

  class ErrorReason; end

  # Generated when trying to lookup a gem to indicate that the gem
  # was found, but that it isn't usable on the current platform.
  #
  # fetch and install read these and report them to the user to aid
  # in figuring out why a gem couldn't be installed.
  #
  class PlatformMismatch < ErrorReason
    ##
    # the name of the gem
    attr_reader :name

    ##
    # the version
    attr_reader :version

    ##
    # The platforms that are mismatched
    attr_reader :platforms

    def initialize(name, version)
      @name = name
      @version = version
      @platforms = []
    end

    ##
    # append a platform to the list of mismatched platforms.
    #
    # Platforms are added via this instead of injected via the constructor
    # so that we can loop over a list of mismatches and just add them rather
    # than perform some kind of calculation mismatch summary before creation.
    def add_platform(platform)
      @platforms << platform
    end

    ##
    # A wordy description of the error.
    def wordy
      "Found %s (%s), but was for platform%s %s" %
        [@name,
         @version,
         @platforms.size == 1 ? "" : "s",
         @platforms.join(" ,")]
    end
  end

  ##
  # An error that indicates we weren't able to fetch some
  # data from a source

  class SourceFetchProblem < ErrorReason
    ##
    # Creates a new SourceFetchProblem for the given +source+ and +error+.

    def initialize(source, error)
      @source = source
      @error = error
    end

    ##
    # The source that had the fetch problem.

    attr_reader :source

    ##
    # The fetch error which is an Exception subclass.

    attr_reader :error

    ##
    # An English description of the error.

    def wordy
      "Unable to download data from #{Gem::Uri.redact(@source.uri)} - #{@error.message}"
    end

    ##
    # The "exception" alias allows you to call raise on a SourceFetchProblem.

    alias exception error
  end
end