diff options
Diffstat (limited to 'ruby_2_2/lib/irb/input-method.rb')
| -rw-r--r-- | ruby_2_2/lib/irb/input-method.rb | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/ruby_2_2/lib/irb/input-method.rb b/ruby_2_2/lib/irb/input-method.rb new file mode 100644 index 0000000000..4ea3f585f8 --- /dev/null +++ b/ruby_2_2/lib/irb/input-method.rb @@ -0,0 +1,191 @@ +# +# irb/input-method.rb - input methods used irb +# $Release Version: 0.9.6$ +# $Revision$ +# 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 |