[rubygems/rubygems] Use a constant empty tar header to avoid extra allocations

[ruby.git] / lib / rdoc / top_level.rb

# frozen_string_literal: true
##
# A TopLevel context is a representation of the contents of a single file

class RDoc::TopLevel < RDoc::Context

  MARSHAL_VERSION = 0 # :nodoc:

  ##
  # This TopLevel's File::Stat struct

  attr_accessor :file_stat

  ##
  # Relative name of this file

  attr_accessor :relative_name

  ##
  # Absolute name of this file

  attr_accessor :absolute_name

  ##
  # All the classes or modules that were declared in
  # this file. These are assigned to either +#classes_hash+
  # or +#modules_hash+ once we know what they really are.

  attr_reader :classes_or_modules

  attr_accessor :diagram # :nodoc:

  ##
  # The parser class that processed this file

  attr_reader :parser

  ##
  # Creates a new TopLevel for the file at +absolute_name+.  If documentation
  # is being generated outside the source dir +relative_name+ is relative to
  # the source directory.

  def initialize absolute_name, relative_name = absolute_name
    super()
    @name = nil
    @absolute_name = absolute_name
    @relative_name = relative_name
    @file_stat     = File.stat(absolute_name) rescue nil # HACK for testing
    @diagram       = nil
    @parser        = nil

    @classes_or_modules = []
  end

  ##
  # Sets the parser for this toplevel context, also the store.

  def parser=(val)
    @parser = val
    @store.update_parser_of_file(absolute_name, val) if @store
    @parser
  end

  ##
  # An RDoc::TopLevel is equal to another with the same relative_name

  def == other
    self.class === other and @relative_name == other.relative_name
  end

  alias eql? ==

  ##
  # Adds +an_alias+ to +Object+ instead of +self+.

  def add_alias(an_alias)
    object_class.record_location self
    return an_alias unless @document_self
    object_class.add_alias an_alias
  end

  ##
  # Adds +constant+ to +Object+ instead of +self+.

  def add_constant constant
    object_class.record_location self
    return constant unless @document_self
    object_class.add_constant constant
  end

  ##
  # Adds +include+ to +Object+ instead of +self+.

  def add_include(include)
    object_class.record_location self
    return include unless @document_self
    object_class.add_include include
  end

  ##
  # Adds +method+ to +Object+ instead of +self+.

  def add_method(method)
    object_class.record_location self
    return method unless @document_self
    object_class.add_method method
  end

  ##
  # Adds class or module +mod+. Used in the building phase
  # by the Ruby parser.

  def add_to_classes_or_modules mod
    @classes_or_modules << mod
  end

  ##
  # Base name of this file

  def base_name
    File.basename @relative_name
  end

  alias name base_name

  ##
  # Only a TopLevel that contains text file) will be displayed.  See also
  # RDoc::CodeObject#display?

  def display?
    text? and super
  end

  ##
  # See RDoc::TopLevel::find_class_or_module
  #--
  # TODO Why do we search through all classes/modules found, not just the
  #       ones of this instance?

  def find_class_or_module name
    @store.find_class_or_module name
  end

  ##
  # Finds a class or module named +symbol+

  def find_local_symbol(symbol)
    find_class_or_module(symbol) || super
  end

  ##
  # Finds a module or class with +name+

  def find_module_named(name)
    find_class_or_module(name)
  end

  ##
  # Returns the relative name of this file

  def full_name
    @relative_name
  end

  ##
  # An RDoc::TopLevel has the same hash as another with the same
  # relative_name

  def hash
    @relative_name.hash
  end

  ##
  # URL for this with a +prefix+

  def http_url(prefix)
    path = [prefix, @relative_name.tr('.', '_')]

    File.join(*path.compact) + '.html'
  end

  def inspect # :nodoc:
    "#<%s:0x%x %p modules: %p classes: %p>" % [
      self.class, object_id,
      base_name,
      @modules.map { |n,m| m },
      @classes.map { |n,c| c }
    ]
  end

  ##
  # Time this file was last modified, if known

  def last_modified
    @file_stat ? file_stat.mtime : nil
  end

  ##
  # Dumps this TopLevel for use by ri.  See also #marshal_load

  def marshal_dump
    [
      MARSHAL_VERSION,
      @relative_name,
      @parser,
      parse(@comment),
    ]
  end

  ##
  # Loads this TopLevel from +array+.

  def marshal_load array # :nodoc:
    initialize array[1]

    @parser  = array[2]
    @comment = array[3]

    @file_stat          = nil
  end

  ##
  # Returns the NormalClass "Object", creating it if not found.
  #
  # Records +self+ as a location in "Object".

  def object_class
    @object_class ||= begin
      oc = @store.find_class_named('Object') || add_class(RDoc::NormalClass, 'Object')
      oc.record_location self
      oc
    end
  end

  ##
  # Base name of this file without the extension

  def page_name
    basename = File.basename @relative_name
    basename =~ /\.(rb|rdoc|txt|md)$/i

    $` || basename
  end

  ##
  # Path to this file for use with HTML generator output.

  def path
    http_url @store.rdoc.generator.file_dir
  end

  def pretty_print q # :nodoc:
    q.group 2, "[#{self.class}: ", "]" do
      q.text "base name: #{base_name.inspect}"
      q.breakable

      items = @modules.map { |n,m| m }
      items.concat @modules.map { |n,c| c }
      q.seplist items do |mod| q.pp mod end
    end
  end

  ##
  # Search record used by RDoc::Generator::JsonIndex

  def search_record
    return unless @parser < RDoc::Parser::Text

    [
      page_name,
      '',
      page_name,
      '',
      path,
      '',
      snippet(@comment),
    ]
  end

  ##
  # Is this TopLevel from a text file instead of a source code file?

  def text?
    @parser and @parser.include? RDoc::Parser::Text
  end

  def to_s # :nodoc:
    "file #{full_name}"
  end

end