Class: Sandbox::IRB

Inherits:
Object
  • Object
show all
Defined in:
lib/sandbox/irb.rb

Instance Method Summary collapse

Constructor Details

#initialize(box) ⇒ IRB

Returns a new instance of IRB.



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# File 'lib/sandbox/irb.rb', line 6

def initialize(box)
  @box, @sig, @p = box, :IN_IRB
  @box_errors = %w[StandardError ScriptError].map { |x| @box.eval(x) }
  @prompt = {:start => ">> ", :continue => ".. ", :nested => ".. ",
    :string => "   ", :return => "=> %s\n"}
end

Instance Method Details

#box_eval(str) ⇒ Object 



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# File 'lib/sandbox/irb.rb', line 13

def box_eval(str)
  @box.eval(str)
end

#prompt(prompt, ltype, indent, line_no) ⇒ Object 



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# File 'lib/sandbox/irb.rb', line 54

def prompt(prompt, ltype, indent, line_no)
  p = prompt.dup
  p.gsub!(/%([0-9]+)?([a-zA-Z])/) do
    case $2
    # when "N"
    #   @context.irb_name
    # when "m"
    #   @context.main.to_s
    # when "M"
    #   @context.main.inspect
    when "l"
      ltype
    when "i"
      if $1 
        format("%" + $1 + "d", indent)
      else
        indent.to_s
      end
    when "n"
      if $1 
        format("%" + $1 + "d", line_no)
      else
        line_no.to_s
      end
    when "%"
      "%"
    end
  end
  p
end

#signal_status(status) ⇒ Object 



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# File 'lib/sandbox/irb.rb', line 85

def signal_status(status)
  return yield if @sig == :IN_LOAD
  sig_back = @sig
  @sig = status
  begin
    yield
  ensure
    @sig = sig_back
  end
end

#start(io) ⇒ Object 



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# File 'lib/sandbox/irb.rb', line 17

def start(io)
  scanner = RubyLex.new
  scanner.exception_on_syntax_error = false
  scanner.set_prompt do |ltype, indent, continue, line_no|
    if ltype
      f = @prompt[:string]
    elsif continue
      f = @prompt[:continue]
    elsif indent > 0
      f = @prompt[:nested]
    else
      f = @prompt[:start]
    end
    f = "" unless f
    @p = prompt(f, ltype, indent, line_no)
  end

  scanner.set_input(io) do
    signal_status(:IN_INPUT) do
      io.print @p
      io.gets
    end
  end

  scanner.each_top_level_statement do |line, line_no|
    signal_status(:IN_EVAL) do
      line.untaint
      begin
        val = box_eval(line)
        io.puts @prompt[:return] % [val.inspect]
      rescue Sandbox::Exception, Sandbox::TimeoutError => e
        io.print e, "\n"
      end
    end
  end
end