Class: TclTkInterpreter

Inherits:
Object show all
Defined in:
lib/tcltk.rb

Overview

class TclTkInterpreter: tcl/tk interpreter

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ TclTkInterpreter

initialize():



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# File 'lib/tcltk.rb', line 88

def initialize()
  # generate interpreter object
  @ip = TclTkIp.new()

  # add ruby_fmt command to tcl interpreter
  # ruby_fmt command format arguments by `format' and call `ruby' command
  # (notice ruby command receives only one argument)
  if $DEBUG
    @ip._eval("proc ruby_fmt {fmt args} { puts \"ruby_fmt: $fmt $args\" ; set cmd [list ruby [format $fmt $args]] ; uplevel $cmd }")
  else
    @ip._eval("proc ruby_fmt {fmt args} { set cmd [list ruby [format $fmt $args]] ; uplevel $cmd }")
  end

  # @ip._get_eval_string(*args): generate string to evaluate in tcl interpreter
  #   *args: script which is going to be evaluated under tcl/tk
  def @ip._get_eval_string(*args)
    argstr = ""
    args.each{|arg|
      argstr += " " if argstr != ""
      # call to_eval if it is defined
      if (arg.respond_to?(:to_eval))
        argstr += arg.to_eval()
      else
        # call to_s unless defined
        argstr += arg.to_s()
      end
    }
    return argstr
  end

  # @ip._eval_args(*args): evaluate string under tcl/tk interpreter
  #     returns result string.
  #   *args: script which is going to be evaluated under tcl/tk
  def @ip._eval_args(*args)
    # calculate the string to eval in the interpreter
    argstr = _get_eval_string(*args)

    # evaluate under the interpreter
    print("_eval: \"", argstr, "\"") if $DEBUG
    res = _eval(argstr)
    if $DEBUG
      print(" -> \"", res, "\"\n")
    elsif  _return_value() != 0
      print(res, "\n")
    end
    fail(%Q/can't eval "#{argstr}"/) if _return_value() != 0 #'
    return res
  end

  # generate tcl/tk command object and register in the hash
  @commands = {}
  # for all commands registered in tcl/tk interpreter:
  @ip._eval("info command").split(/ /).each{|comname|
    if comname =~ /^[.]/
      # if command is a widget (path), generate TclTkWidget,
      # and register it in the hash
      @commands[comname] = TclTkWidget.new(@ip, comname)
    else
      # otherwise, generate TclTkCommand
      @commands[comname] = TclTkCommand.new(@ip, comname)
    end
  }
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(id, *args) ⇒ Object

method_missing(id, *args): execute undefined method as tcl/tk command

id: method symbol
*args: method arguments



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# File 'lib/tcltk.rb', line 170

def method_missing(id, *args)
  # if command named by id registered, then execute it
  if @commands.key?(id.id2name)
    return @commands[id.id2name].e(*args)
  else
    # otherwise, exception
    super
  end
end

Class Method Details

._eval_args(*args) ⇒ Object

@ip._eval_args(*args): evaluate string under tcl/tk interpreter

  returns result string.
*args: script which is going to be evaluated under tcl/tk



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# File 'lib/tcltk.rb', line 121

def @ip._eval_args(*args)
  # calculate the string to eval in the interpreter
  argstr = _get_eval_string(*args)

  # evaluate under the interpreter
  print("_eval: \"", argstr, "\"") if $DEBUG
  res = _eval(argstr)
  if $DEBUG
    print(" -> \"", res, "\"\n")
  elsif  _return_value() != 0
    print(res, "\n")
  end
  fail(%Q/can't eval "#{argstr}"/) if _return_value() != 0 #'
  return res
end

._get_eval_string(*args) ⇒ Object

@ip._get_eval_string(*args): generate string to evaluate in tcl interpreter

*args: script which is going to be evaluated under tcl/tk



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# File 'lib/tcltk.rb', line 103

def @ip._get_eval_string(*args)
  argstr = ""
  args.each{|arg|
    argstr += " " if argstr != ""
    # call to_eval if it is defined
    if (arg.respond_to?(:to_eval))
      argstr += arg.to_eval()
    else
      # call to_s unless defined
      argstr += arg.to_s()
    end
  }
  return argstr
end

Instance Method Details

#_tcltkip ⇒ Object

_tcltkip(): returns @ip(TclTkIp)



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# File 'lib/tcltk.rb', line 163

def _tcltkip()
  return @ip
end

#commands ⇒ Object

commands(): returns hash of the tcl/tk commands



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# File 'lib/tcltk.rb', line 153

def commands()
  return @commands
end

#rootwidget ⇒ Object

rootwidget(): returns root widget(TclTkWidget)



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# File 'lib/tcltk.rb', line 158

def rootwidget()
  return @commands["."]
end