class IRB::ReadlineInputMethod

Public Class Methods

initialize_readline() click to toggle source

# File lib/irb/input-method.rb, line 156
def self.initialize_readline
  require "readline"
rescue LoadError
else
  include ::Readline
end

new() click to toggle source

Creates a new input method object using Readline

Calls superclass method IRB::InputMethod::new

# File lib/irb/input-method.rb, line 164
def initialize
  self.class.initialize_readline
  if Readline.respond_to?(:encoding_system_needs)
    IRB.__send__(:set_encoding, Readline.encoding_system_needs.name, override: false)
  end
  super

  @line_no = 0
  @line = []
  @eof = false

  @stdin = IO.open(STDIN.to_i, :external_encoding => IRB.conf[:LC_MESSAGES].encoding, :internal_encoding => "-")
  @stdout = IO.open(STDOUT.to_i, 'w', :external_encoding => IRB.conf[:LC_MESSAGES].encoding, :internal_encoding => "-")

  if Readline.respond_to?("basic_word_break_characters=")
    Readline.basic_word_break_characters = IRB::InputCompletor::BASIC_WORD_BREAK_CHARACTERS
  end
  Readline.completion_append_character = nil
  Readline.completion_proc = IRB::InputCompletor::CompletionProc
end

Public Instance Methods

encoding() click to toggle source

The external encoding for standard input.

# File lib/irb/input-method.rb, line 226
def encoding
  @stdin.external_encoding
end

eof?() click to toggle source

Whether the end of this input method has been reached, returns true if there is no more data to read.

See IO#eof? for more information.

# File lib/irb/input-method.rb, line 204
def eof?
  @eof
end

gets() click to toggle source

Reads the next line from this input method.

See IO#gets for more information.

# File lib/irb/input-method.rb, line 188
def gets
  Readline.input = @stdin
  Readline.output = @stdout
  if l = readline(@prompt, false)
    HISTORY.push(l) if !l.empty?
    @line[@line_no += 1] = l + "\n"
  else
    @eof = true
    l
  end
end

inspect() click to toggle source

For debug message

# File lib/irb/input-method.rb, line 231
def inspect
  readline_impl = (defined?(Reline) && Readline == Reline) ? 'Reline' : 'ext/readline'
  str = "ReadlineInputMethod with #{readline_impl} #{Readline::VERSION}"
  inputrc_path = File.expand_path(ENV['INPUTRC'] || '~/.inputrc')
  str += " and #{inputrc_path}" if File.exist?(inputrc_path)
  str
end

line(line_no) click to toggle source

Returns the current line number for io.

line counts the number of times gets is called.

See IO#lineno for more information.

# File lib/irb/input-method.rb, line 221
def line(line_no)
  @line[line_no]
end

readable_after_eof?() click to toggle source

Whether this input method is still readable when there is no more data to read.

See IO#eof for more information.

# File lib/irb/input-method.rb, line 212
def readable_after_eof?
  true
end