Class: IRB::StdioInputMethod

Inherits:
InputMethod show all
Defined in:
lib/irb/input-method.rb

Direct Known Subclasses

ReadlineInputMethod, RelineInputMethod

Constant Summary

Constants inherited from InputMethod

InputMethod::BASIC_WORD_BREAK_CHARACTERS

Instance Attribute Summary

Attributes inherited from InputMethod

#prompt

Instance Method Summary collapse

Methods inherited from InputMethod

#support_history_saving?, #winsize

Constructor Details

#initialize ⇒ StdioInputMethod

Creates a new input method object



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# File 'lib/irb/input-method.rb', line 59

def initialize
  @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

Instance Method Details

#encoding ⇒ Object

The external encoding for standard input.



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# File 'lib/irb/input-method.rb', line 113

def encoding
  @stdin.external_encoding
end

#eof? ⇒ Boolean

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.

Returns:

  • (Boolean) 


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# File 'lib/irb/input-method.rb', line 80

def eof?
  if @stdin.wait_readable(0.00001)
    c = @stdin.getc
    result = c.nil? ? true : false
    @stdin.ungetc(c) unless c.nil?
    result
  else # buffer is empty
    false
  end
end

#gets ⇒ Object

Reads the next line from this input method.

See IO#gets for more information.



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# File 'lib/irb/input-method.rb', line 69

def gets
  puts if @stdout.tty? # workaround for debug compatibility test
  print @prompt
  line = @stdin.gets
  @line[@line_no += 1] = line
end

#inspect ⇒ Object

For debug message



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# File 'lib/irb/input-method.rb', line 118

def inspect
  'StdioInputMethod'
end

#line(line_no) ⇒ Object

Returns the current line number for #io.

#line counts the number of times #gets is called.

See IO#lineno for more information.



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# File 'lib/irb/input-method.rb', line 108

def line(line_no)
  @line[line_no]
end

#prompting? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/irb/input-method.rb', line 99

def prompting?
  STDIN.tty?
end

#readable_after_eof? ⇒ Boolean

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

See IO#eof for more information.

Returns:

  • (Boolean) 


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# File 'lib/irb/input-method.rb', line 95

def readable_after_eof?
  true
end