#
# irb/input-method.rb - input methods used irb
# $Release Version: 0.9.6$
# $Revision: 47266 $
# by Keiju ISHITSUKA(keiju@ruby-lang.org)
#
# --
#
#
#
require 'irb/src_encoding'
require 'irb/magic-file'
module IRB
STDIN_FILE_NAME = "(line)" # :nodoc:
class InputMethod
# Creates a new input method object
def initialize(file = STDIN_FILE_NAME)
@file_name = file
end
# The file name of this input method, usually given during initialization.
attr_reader :file_name
# The irb prompt associated with this input method
attr_accessor :prompt
# Reads the next line from this input method.
#
# See IO#gets for more information.
def gets
IRB.fail NotImplementedError, "gets"
end
public :gets
# Whether this input method is still readable when there is no more data to
# read.
#
# See IO#eof for more information.
def readable_after_eof?
false
end
end
class StdioInputMethod < InputMethod
# Creates a new input method object
def initialize
super
@line_no = 0
@line = []
@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 => "-")
end
# Reads the next line from this input method.
#
# See IO#gets for more information.
def gets
print @prompt
line = @stdin.gets
@line[@line_no += 1] = line
end
# 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.
def eof?
@stdin.eof?
end
# Whether this input method is still readable when there is no more data to
# read.
#
# See IO#eof for more information.
def readable_after_eof?
true
end
# Returns the current line number for #io.
#
# #line counts the number of times #gets is called.
#
# See IO#lineno for more information.
def line(line_no)
@line[line_no]
end
# The external encoding for standard input.
def encoding
@stdin.external_encoding
end
end
# Use a File for IO with irb, see InputMethod
class FileInputMethod < InputMethod
# Creates a new input method object
def initialize(file)
super
@io = IRB::MagicFile.open(file)
end
# The file name of this input method, usually given during initialization.
attr_reader :file_name
# 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.
def eof?
@io.eof?
end
# Reads the next line from this input method.
#
# See IO#gets for more information.
def gets
print @prompt
l = @io.gets
l
end
# The external encoding for standard input.
def encoding
@io.external_encoding
end
end
begin
require "readline"
class ReadlineInputMethod < InputMethod
include Readline
# Creates a new input method object using Readline
def initialize
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 => "-")
end
# Reads the next line from this input method.
#
# See IO#gets for more information.
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
# 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.
def eof?
@eof
end
# Whether this input method is still readable when there is no more data to
# read.
#
# See IO#eof for more information.
def readable_after_eof?
true
end
# Returns the current line number for #io.
#
# #line counts the number of times #gets is called.
#
# See IO#lineno for more information.
def line(line_no)
@line[line_no]
end
# The external encoding for standard input.
def encoding
@stdin.external_encoding
end
end
rescue LoadError
end
end
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