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# frozen_string_literal: true
##
# BasicSpecification is an abstract class which implements some common code
# used by both Specification and StubSpecification.

class Gem::BasicSpecification

  ##
  # Allows installation of extensions for git: gems.

  attr_writer :base_dir # :nodoc:

  ##
  # Sets the directory where extensions for this gem will be installed.

  attr_writer :extension_dir # :nodoc:

  ##
  # Is this specification ignored for activation purposes?

  attr_writer :ignored # :nodoc:

  ##
  # The path this gemspec was loaded from.  This attribute is not persisted.

  attr_accessor :loaded_from

  ##
  # Allows correct activation of git: and path: gems.

  attr_writer :full_gem_path # :nodoc:

  def initialize
    internal_init
  end

  def self.default_specifications_dir
    File.join(Gem.default_dir, "specifications", "default")
  end

  ##
  # The path to the gem.build_complete file within the extension install
  # directory.

  def gem_build_complete_path # :nodoc:
    File.join extension_dir, 'gem.build_complete'
  end

  ##
  # True when the gem has been activated

  def activated?
    raise NotImplementedError
  end

  ##
  # Returns the full path to the base gem directory.
  #
  # eg: /usr/local/lib/ruby/gems/1.8

  def base_dir
    raise NotImplementedError
  end

  ##
  # Return true if this spec can require +file+.

  def contains_requirable_file?(file)
    if @ignored
      return false
    elsif missing_extensions?
      @ignored = true

      warn "Ignoring #{full_name} because its extensions are not built. " +
        "Try: gem pristine #{name} --version #{version}"
      return false
    end

    have_file? file, Gem.suffixes
  end

  def default_gem?
    loaded_from &&
      File.dirname(loaded_from) == self.class.default_specifications_dir
  end

  ##
  # Returns full path to the directory where gem's extensions are installed.

  def extension_dir
    @extension_dir ||= File.expand_path(File.join(extensions_dir, full_name)).untaint
  end

  ##
  # Returns path to the extensions directory.

  def extensions_dir
    Gem.default_ext_dir_for(base_dir) ||
      File.join(base_dir, 'extensions', Gem::Platform.local.to_s,
                Gem.extension_api_version)
  end

  def find_full_gem_path # :nodoc:
    # TODO: also, shouldn't it default to full_name if it hasn't been written?
    path = File.expand_path File.join(gems_dir, full_name)
    path.untaint
    path
  end

  private :find_full_gem_path

  ##
  # The full path to the gem (install path + full name).

  def full_gem_path
    # TODO: This is a heavily used method by gems, so we'll need
    # to aleast just alias it to #gem_dir rather than remove it.
    @full_gem_path ||= find_full_gem_path
  end

  ##
  # Returns the full name (name-version) of this Gem.  Platform information
  # is included (name-version-platform) if it is specified and not the
  # default Ruby platform.

  def full_name
    if platform == Gem::Platform::RUBY or platform.nil?
      "#{name}-#{version}".dup.untaint
    else
      "#{name}-#{version}-#{platform}".dup.untaint
    end
  end

  ##
  # Full paths in the gem to add to <code>$LOAD_PATH</code> when this gem is
  # activated.

  def full_require_paths
    @full_require_paths ||=
    begin
      full_paths = raw_require_paths.map do |path|
        File.join full_gem_path, path.untaint
      end

      full_paths << extension_dir if have_extensions?

      full_paths
    end
  end

  ##
  # The path to the data directory for this gem.

  def datadir
    # TODO: drop the extra ", gem_name" which is uselessly redundant
    File.expand_path(File.join(gems_dir, full_name, "data", name)).untaint
  end

  ##
  # Full path of the target library file.
  # If the file is not in this gem, return nil.

  def to_fullpath(path)
    if activated?
      @paths_map ||= {}
      @paths_map[path] ||=
      begin
        fullpath = nil
        suffixes = Gem.suffixes
        suffixes.find do |suf|
          full_require_paths.find do |dir|
            File.file?(fullpath = "#{dir}/#{path}#{suf}")
          end
        end ? fullpath : nil
      end
    else
      nil
    end
  end

  ##
  # Returns the full path to this spec's gem directory.
  # eg: /usr/local/lib/ruby/1.8/gems/mygem-1.0

  def gem_dir
    @gem_dir ||= File.expand_path File.join(gems_dir, full_name)
  end

  ##
  # Returns the full path to the gems directory containing this spec's
  # gem directory. eg: /usr/local/lib/ruby/1.8/gems

  def gems_dir
    raise NotImplementedError
  end

  def internal_init # :nodoc:
    @extension_dir = nil
    @full_gem_path         = nil
    @gem_dir               = nil
    @ignored = nil
  end

  ##
  # Name of the gem

  def name
    raise NotImplementedError
  end

  ##
  # Platform of the gem

  def platform
    raise NotImplementedError
  end

  def raw_require_paths # :nodoc:
    raise NotImplementedError
  end

  ##
  # Paths in the gem to add to <code>$LOAD_PATH</code> when this gem is
  # activated.
  #
  # See also #require_paths=
  #
  # If you have an extension you do not need to add <code>"ext"</code> to the
  # require path, the extension build process will copy the extension files
  # into "lib" for you.
  #
  # The default value is <code>"lib"</code>
  #
  # Usage:
  #
  #   # If all library files are in the root directory...
  #   spec.require_path = '.'

  def require_paths
    return raw_require_paths unless have_extensions?

    [extension_dir].concat raw_require_paths
  end

  ##
  # Returns the paths to the source files for use with analysis and
  # documentation tools.  These paths are relative to full_gem_path.

  def source_paths
    paths = raw_require_paths.dup

    if have_extensions?
      ext_dirs = extensions.map do |extension|
        extension.split(File::SEPARATOR, 2).first
      end.uniq

      paths.concat ext_dirs
    end

    paths.uniq
  end

  ##
  # Return all files in this gem that match for +glob+.

  def matches_for_glob(glob) # TODO: rename?
    # TODO: do we need these?? Kill it
    glob = File.join(self.lib_dirs_glob, glob)

    Dir[glob].map { |f| f.untaint } # FIX our tests are broken, run w/ SAFE=1
  end

  ##
  # Returns a string usable in Dir.glob to match all requirable paths
  # for this spec.

  def lib_dirs_glob
    dirs = if self.raw_require_paths
             if self.raw_require_paths.size > 1
               "{#{self.raw_require_paths.join(',')}}"
             else
               self.raw_require_paths.first
             end
           else
             "lib" # default value for require_paths for bundler/inline
           end

    "#{self.full_gem_path}/#{dirs}".dup.untaint
  end

  ##
  # Return a Gem::Specification from this gem

  def to_spec
    raise NotImplementedError
  end

  ##
  # Version of the gem

  def version
    raise NotImplementedError
  end

  ##
  # Whether this specification is stubbed - i.e. we have information
  # about the gem from a stub line, without having to evaluate the
  # entire gemspec file.
  def stubbed?
    raise NotImplementedError
  end

  def this; self; end

  private

  def have_extensions?; !extensions.empty?; end

  def have_file?(file, suffixes)
    return true if raw_require_paths.any? do |path|
      base = File.join(gems_dir, full_name, path.untaint, file).untaint
      suffixes.any? { |suf| File.file? base + suf }
    end

    if have_extensions?
      base = File.join extension_dir, file
      suffixes.any? { |suf| File.file? base + suf }
    else
      false
    end
  end
end