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require 'rubygems/remote_fetcher'
require 'rubygems/user_interaction'
require 'rubygems/errors'
require 'rubygems/text'
require 'rubygems/name_tuple'

##
# SpecFetcher handles metadata updates from remote gem repositories.

class Gem::SpecFetcher

  include Gem::UserInteraction
  include Gem::Text

  ##
  # Cache of latest specs

  attr_reader :latest_specs # :nodoc:

  ##
  # Cache of all released specs

  attr_reader :specs # :nodoc:

  ##
  # Cache of prerelease specs

  attr_reader :prerelease_specs # :nodoc:

  @fetcher = nil

  def self.fetcher
    @fetcher ||= new
  end

  def self.fetcher=(fetcher) # :nodoc:
    @fetcher = fetcher
  end

  def initialize
    @dir = File.join Gem.user_home, '.gem', 'specs'
    @update_cache =
      begin
        File.stat(Gem.user_home).uid == Process.uid
      rescue Errno::EACCES, Errno::ENOENT
        false
      end

    @specs = {}
    @latest_specs = {}
    @prerelease_specs = {}

    @caches = {
      :latest => @latest_specs,
      :prerelease => @prerelease_specs,
      :released => @specs,
    }

    @fetcher = Gem::RemoteFetcher.fetcher
  end

  ##
  #
  # Find and fetch gem name tuples that match +dependency+.
  #
  # If +matching_platform+ is false, gems for all platforms are returned.

  def search_for_dependency(dependency, matching_platform=true)
    found = {}

    rejected_specs = {}

    if dependency.prerelease?
      type = :complete
    elsif dependency.latest_version?
      type = :latest
    else
      type = :released
    end

    list, errors = available_specs(type)
    list.each do |source, specs|
      found[source] = specs.select do |tup|
        if dependency.match?(tup)
          if matching_platform and !Gem::Platform.match(tup.platform)
            pm = (
              rejected_specs[dependency] ||= \
                Gem::PlatformMismatch.new(tup.name, tup.version))
            pm.add_platform tup.platform
            false
          else
            true
          end
        end
      end
    end

    errors += rejected_specs.values

    tuples = []

    found.each do |source, specs|
      specs.each do |s|
        tuples << [s, source]
      end
    end

    tuples = tuples.sort_by { |x| x[0] }

    return [tuples, errors]
  end


  ##
  # Return all gem name tuples who's names match +obj+

  def detect(type=:complete)
    tuples = []

    list, _ = available_specs(type)
    list.each do |source, specs|
      specs.each do |tup|
        if yield(tup)
          tuples << [tup, source]
        end
      end
    end

    tuples
  end


  ##
  # Find and fetch specs that match +dependency+.
  #
  # If +matching_platform+ is false, gems for all platforms are returned.

  def spec_for_dependency(dependency, matching_platform=true)
    tuples, errors = search_for_dependency(dependency, matching_platform)

    specs = []
    tuples.each do |tup, source|
      begin
        spec = source.fetch_spec(tup)
      rescue Gem::RemoteFetcher::FetchError => e
        errors << Gem::SourceFetchProblem.new(source, e)
      else
        specs << [spec, source]
      end
    end

    return [specs, errors]
  end

  ##
  # Suggests gems based on the supplied +gem_name+. Returns an array of
  # alternative gem names.

  def suggest_gems_from_name gem_name
    gem_name        = gem_name.downcase.tr('_-', '')
    max             = gem_name.size / 2
    names           = available_specs(:complete).first.values.flatten(1)

    matches = names.map { |n|
      next unless n.match_platform?

      distance = levenshtein_distance gem_name, n.name.downcase.tr('_-', '')

      next if distance >= max

      return [n.name] if distance == 0

      [n.name, distance]
    }.compact

    matches = matches.uniq.sort_by { |name, dist| dist }

    matches.first(5).map { |name, dist| name }
  end

  ##
  # Returns a list of gems available for each source in Gem::sources.
  #
  # +type+ can be one of 3 values:
  # :released   => Return the list of all released specs
  # :complete   => Return the list of all specs
  # :latest     => Return the list of only the highest version of each gem
  # :prerelease => Return the list of all prerelease only specs
  #

  def available_specs(type)
    errors = []
    list = {}

    Gem.sources.each_source do |source|
      begin
        names = case type
                when :latest
                  tuples_for source, :latest
                when :released
                  tuples_for source, :released
                when :complete
                  tuples_for(source, :prerelease, true) +
                    tuples_for(source, :released)
                when :prerelease
                  tuples_for(source, :prerelease)
                else
                  raise Gem::Exception, "Unknown type - :#{type}"
                end
      rescue Gem::RemoteFetcher::FetchError => e
        errors << Gem::SourceFetchProblem.new(source, e)
      else
        list[source] = names
      end
    end

    [list, errors]
  end

  def tuples_for(source, type, gracefully_ignore=false)
    cache = @caches[type]

    if gracefully_ignore
      begin
        cache[source.uri] ||= source.load_specs(type)
      rescue Gem::RemoteFetcher::FetchError
        []
      end
    else
      cache[source.uri] ||= source.load_specs(type)
    end
  end

end

Filemanager

DIR : / usr/ share/ rubygems/ rubygems/
Name Type Size Permission Actions
commands Folder 0755
core_ext Folder 0755
defaults Folder 0755
ext Folder 0755
package Folder 0755
security Folder 0755
ssl_certs Folder 0755
LICENSE.txt File 2.27 KB 0644
available_set.rb File 1.56 KB 0644
command.rb File 13.43 KB 0644
command_manager.rb File 5.36 KB 0644
compatibility.rb File 1.58 KB 0644
config_file.rb File 11.82 KB 0644
defaults.rb File 3.06 KB 0644
dependency.rb File 7.74 KB 0644
dependency_installer.rb File 12.12 KB 0644
dependency_list.rb File 5.53 KB 0644
dependency_resolver.rb File 14.97 KB 0644
deprecate.rb File 1.73 KB 0644
doctor.rb File 2.86 KB 0644
errors.rb File 2.14 KB 0644
exceptions.rb File 2.7 KB 0644
ext.rb File 416 B 0644
gem_runner.rb File 1.98 KB 0644
gemcutter_utilities.rb File 2.91 KB 0644
indexer.rb File 12.89 KB 0644
install_message.rb File 281 B 0644
install_update_options.rb File 5.09 KB 0644
installer.rb File 23.04 KB 0644
installer_test_case.rb File 4.28 KB 0644
local_remote_options.rb File 3.36 KB 0644
mock_gem_ui.rb File 1.35 KB 0644
name_tuple.rb File 1.96 KB 0644
package.rb File 14.38 KB 0644
package_task.rb File 3.77 KB 0644
path_support.rb File 1.58 KB 0644
platform.rb File 5.63 KB 0644
psych_additions.rb File 249 B 0644
psych_tree.rb File 763 B 0644
rdoc.rb File 7.72 KB 0644
remote_fetcher.rb File 15.69 KB 0644
request_set.rb File 3.67 KB 0644
requirement.rb File 6.02 KB 0644
safe_yaml.rb File 1.11 KB 0644
security.rb File 20.56 KB 0644
server.rb File 22.03 KB 0644
source.rb File 3.12 KB 0644
source_list.rb File 1.22 KB 0644
source_local.rb File 1.88 KB 0644
source_specific_file.rb File 552 B 0644
spec_fetcher.rb File 5.17 KB 0644
specification.rb File 68.24 KB 0644
syck_hack.rb File 2.07 KB 0644
test_case.rb File 28.09 KB 0644
test_utilities.rb File 4.03 KB 0644
text.rb File 1.72 KB 0644
uninstaller.rb File 8.32 KB 0644
user_interaction.rb File 11.68 KB 0644
validator.rb File 4.08 KB 0644
version.rb File 10.5 KB 0644
version_option.rb File 1.59 KB 0644