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path: root/ext/tk/lib/multi-tk.rb
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#
#		multi-tk.rb - supports multi Tk interpreters
#			by Hidetoshi NAGAI <nagai@ai.kyutech.ac.jp>

require 'tcltklib'
require 'tkutil'
require 'thread'

if defined? Tk
  fail RuntimeError, "'multi-tk' library must be required before requiring 'tk'"
end

################################################
# ignore exception on the mainloop?

TclTkLib.mainloop_abort_on_exception = true
# TclTkLib.mainloop_abort_on_exception = false
# TclTkLib.mainloop_abort_on_exception = nil


################################################
# exceptiopn to treat the return value from IP
class MultiTkIp_OK < Exception
  def self.send(thread, ret=nil)
    thread.raise self.new(ret)
  end

  def initialize(ret=nil)
    super('succeed')
    @return_value = ret
  end

  attr_reader :return_value
  alias value return_value
end
MultiTkIp_OK.freeze


################################################
# methods for construction
class MultiTkIp
  SLAVE_IP_ID = ['slave'.freeze, '0'.taint].freeze

  @@IP_TABLE = {}.taint unless defined?(@@IP_TABLE)

  @@INIT_IP_ENV  = [].taint unless defined?(@@INIT_IP_ENV)  # table of Procs
  @@ADD_TK_PROCS = [].taint unless defined?(@@ADD_TK_PROCS) # table of [name, args, body]

  @@TK_TABLE_LIST = [].taint unless defined?(@@TK_TABLE_LIST)

  @@TK_CMD_TBL = {}.taint unless defined?(@@TK_CMD_TBL)

  ######################################

  @@CB_ENTRY_CLASS = Class.new(TkCallbackEntry){|c|
    def initialize(ip, cmd)
      @ip = ip
      @cmd = cmd
    end
    attr_reader :ip, :cmd
    def inspect
      cmd.inspect
    end
    def call(*args)
      begin
	 unless @ip.deleted?
	   @ip.cb_eval(@cmd, *args)
	 end
      rescue TkCallbackBreak, TkCallbackContinue
	fail
      rescue Exception
      end
    end
  }.freeze

  ######################################

  def _keys2opts(src_keys)
    return nil if src_keys == nil
    keys = {}; src_keys.each{|k, v| keys[k.to_s] = v}
    #keys.collect{|k,v| "-#{k} #{v}"}.join(' ')
    keys.collect{|k,v| "-#{k} #{TclTkLib._conv_listelement(TkComm::_get_eval_string(v))}"}.join(' ')
  end
  private :_keys2opts

  def _check_and_return(thread, exception, wait=0)
    return nil unless thread

    if wait == 0
      # no wait
      thread.raise exception
      return thread
    end

    # wait to stop the caller thread
    wait.times{
      if thread.stop?
	# ready to send exception
	thread.raise exception
	return thread
      end

      # wait
      Thread.pass
    }

    # unexpected error
    thread.raise RuntimeError, "the thread may not wait for the return value"
    return thread
  end

  ######################################

  def set_safe_level(safe)
    @safe_level[0] = safe
    @cmd_queue.enq([@system, 'set_safe_level', safe])
    self
  end
  def safe_level=(safe)
    set_safe_level(safe)
  end
  def self.set_safe_level(safe)
    __getip.set_safe_level(safe)
    self
  end
  def self.safe_level=(safe)
    self.set_safe_level(safe)
  end
  def safe_level
    @safe_level[0]
  end
  def self.safe_level
    __getip.safe_level
  end

  def _create_receiver_and_watchdog(lvl = $SAFE)
    lvl = $SAFE if lvl < $SAFE

    # command-procedures receiver
    receiver = Thread.new(lvl){|safe_level|
      loop do
	thread, cmd, *args = @cmd_queue.deq
	if thread == @system
	  # control command
	  case cmd
	  when 'set_safe_level'
	    begin
	      safe_level = args[0] if safe_level < args[0] 
	    rescue Exception
	      nil
	    end
	  else
	    # ignore
	  end

	else
	  # procedure
	  begin
	    ret = proc{$SAFE = safe_level; cmd.call(*args)}.call
	  rescue SystemExit => e
	    # delete IP
	    unless @interp.deleted?
	      @slave_ip_tbl.each_value{|subip|
		unless subip.deleted?
		  begin
		    subip._invoke('destroy', '.') 
		  rescue Exception
		  end
		  subip.delete
		  # subip._invoke('exit') 
		  # subip._eval_without_enc('exit') 
		end
	      }
	      begin
		@interp._invoke('destroy', '.')
	      rescue Exception
	      end
	      if safe?
		# do 'exit' to call the delete_hook procedure
		@interp._eval_without_enc('exit')
	      else
		@interp.delete
	      end
	    end
	    if e.backtrace[0] =~ /\`exit'/
	      _check_and_return(thread, MultiTkIp_OK.new(true))
	    elsif e.backtrace[0] =~ /\`(exit!|abort)'/
	      _check_and_return(thread, MultiTkIp_OK.new(false))
	    else
	      _check_and_return(thread, MultiTkIp_OK.new(nil))
	    end
	    break
	  rescue SecurityError => e
	    # ignore security error in 'exit', 'exit!', and 'abort'
	    if e.backtrace[0] =~ /\`exit'/
	      unless @interp.deleted?
		@slave_ip_tbl.each_value{|subip|
		  unless subip.deleted?
		    begin
		      subip._invoke('destroy', '.') 
		    rescue Exception
		    end
		    subip.delete 
		    # subip._invoke('exit') 
		    # subip._eval_without_enc('exit') 
		  end
		}
		begin
		  @interp._invoke('destroy', '.')
		rescue Exception
		end
		# @interp.delete
		@interp._eval_without_enc('exit')
	      end
	      _check_and_return(thread, MultiTkIp_OK.new(true))
	      break
	    elsif e.backtrace[0] =~ /\`(exit!|abort)'/
	      unless @interp.deleted?
		@slave_ip_tbl.each_value{|subip|
		  unless subip.deleted?
		    begin
		      subip._invoke('destroy', '.') 
		    rescue Exception
		    end
		    subip.delete 
		    # subip._invoke('exit') 
		    # subip._eval_without_enc('exit') 
		  end
		}
		begin
		  @interp._invoke('destroy', '.')
		rescue Exception
		end
		# @interp.delete
		@interp._eval_without_enc('exit')
	      end
	      _check_and_return(thread, MultiTkIp_OK.new(false))
	      break
	    else
	      _check_and_return(thread, e)
	    end
	  rescue Exception => e
	    # raise exception
	    _check_and_return(thread, e)
	  else
	    # no exception
	    _check_and_return(thread, MultiTkIp_OK.new(ret))
	  end
	end
      end
    }

    # watchdog of receiver
    watchdog = Thread.new{
      begin
	loop do
	  sleep 1
	  break unless receiver.alive?
	end
      rescue Exception
	# ignore all kind of Exception
      end
      # receiver is dead
      loop do
	thread, cmd, *args = @cmd_queue.deq
	next unless thread
	if thread.alive?
	  if @interp.deleted?
	    thread.raise RuntimeError, 'the interpreter is already deleted'
	  else
	    thread.raise RuntimeError, 
	      'the interpreter no longer receives command procedures'
	  end
	end
      end
    }

    # return threads
    [receiver, watchdog]
  end
  private :_check_and_return, :_create_receiver_and_watchdog

  ######################################

  if self.const_defined? :DEFAULT_MASTER_NAME
    name = DEFAULT_MASTER_NAME.to_s
  else
    name = nil
  end
  if self.const_defined?(:DEFAULT_MASTER_OPTS) &&
      DEFAULT_MASTER_OPTS.kind_of?(Hash)
    keys = DEFAULT_MASTER_OPTS
  else
    keys = {}
  end

  @@DEFAULT_MASTER = self.allocate
  @@DEFAULT_MASTER.instance_eval{
    @tk_windows = {}.taint

    @tk_table_list = [].taint

    @slave_ip_tbl = {}.taint

    @slave_ip_top = {}.taint

    unless keys.kind_of? Hash
      fail ArgumentError, "expecting a Hash object for the 2nd argument"
    end

    @interp = TclTkIp.new(name, _keys2opts(keys))
    @ip_name = nil

    @system = Object.new

    @threadgroup  = Thread.current.group

    @safe_level = [$SAFE]

    @cmd_queue = Queue.new

    @cmd_receiver, @receiver_watchdog = _create_receiver_and_watchdog(@safe_level[0])

    @threadgroup.add @cmd_receiver
    @threadgroup.add @receiver_watchdog

    # NOT enclose @threadgroup for @@DEFAULT_MASTER

    @@IP_TABLE[ThreadGroup::Default] = self
    @@IP_TABLE[@threadgroup] = self
  }
  @@DEFAULT_MASTER.freeze # defend against modification

  ######################################

  def self.inherited(subclass)
    # trust if on ThreadGroup::Default or @@DEFAULT_MASTER's ThreadGroup
    if @@IP_TABLE[Thread.current.group] == @@DEFAULT_MASTER
      begin
	class << subclass
	  self.methods.each{|m|
	    begin
	      unless m == '__id__' || m == '__send__' || m == 'freeze'
		undef_method(m)
	      end
	    rescue Exception
	      # ignore all exceptions
	    end
	  }
	end
      ensure
	subclass.freeze
	fail SecurityError, 
	  "cannot create subclass of MultiTkIp on a untrusted ThreadGroup"
      end
    end
  end

  ######################################

  SAFE_OPT_LIST = [
    'accessPath'.freeze, 
    'statics'.freeze, 
    'nested'.freeze, 
    'deleteHook'.freeze
  ].freeze

  def _parse_slaveopts(keys)
    name = nil
    safe = false
    safe_opts = {}
    tk_opts   = {}

    keys.each{|k,v|
      k_str = k.to_s
      if k_str == 'name'
	name = v 
      elsif k_str == 'safe'
	safe = v
      elsif SAFE_OPT_LIST.member?(k_str)
	safe_opts[k_str] = v
      else
	tk_opts[k_str] = v
      end
    }

    if keys['without_tk'] || keys[:without_tk]
      [name, safe, safe_opts, nil]
    else
      [name, safe, safe_opts, tk_opts]
    end
  end
  private :_parse_slaveopts

  def _create_slave_ip_name
    name = SLAVE_IP_ID.join('')
    SLAVE_IP_ID[1].succ!
    name
  end
  private :_create_slave_ip_name

  ######################################

  def __check_safetk_optkeys(optkeys)
    # based on 'safetk.tcl'
    new_keys = {}
    optkeys.each{|k,v| new_keys[k.to_s] = v}

    # check 'display'
    if !new_keys.key?('display')
      begin
	#new_keys['display'] = @interp._invoke('winfo screen .')
	new_keys['display'] = @interp._invoke('winfo', 'screen', '.')
      rescue
	if ENV[DISPLAY]
	  new_keys['display'] = ENV[DISPLAY]
	elsif !new_keys.key?('use')
	  warn "Warning: no screen info or ENV[DISPLAY], so use ':0.0'"
	  new_keys['display'] = ':0.0'
	end
      end
    end

    # check 'use'
    if new_keys.key?('use')
      # given 'use'
      case new_keys['use']
      when TkWindow
	new_keys['use'] = TkWinfo.id(new_keys['use'])
	#assoc_display = @interp._eval('winfo screen .')
	assoc_display = @interp._invoke('winfo', 'screen', '.')
      when /^\..*/
	new_keys['use'] = @interp._invoke('winfo', 'id', new_keys['use'])
	assoc_display = @interp._invoke('winfo', 'screen', new_keys['use'])
      else
	begin
	  pathname = @interp._invoke('winfo', 'pathname', new_keys['use'])
	  assco_display = @interp._invoke('winfo', 'screen', pathname)
	rescue
	  assoc_display = new_keys['display']
	end
      end

      # match display?
      if assoc_display != new_keys['display']
	if optkeys.keys?(:display) || optkeys.keys?('display')
	  fail RuntimeError, 
	    "conflicting 'display'=>#{new_keys['display']} " + 
	    "and display '#{assoc_display}' on 'use'=>#{new_keys['use']}"
	else
	  new_keys['display'] = assoc_display
	end
      end
    end

    # return
    new_keys
  end
  private :__check_safetk_optkeys

  def __create_safetk_frame(slave_ip, slave_name, app_name, keys)
    # display option is used by ::safe::loadTk
    loadTk_keys = {}
    loadTk_keys['display'] = keys['display']
    dup_keys = keys.dup

    # keys for toplevel : allow followings
    toplevel_keys = {}
    ['height', 'width', 'background', 'menu'].each{|k|
      toplevel_keys[k] = dup_keys.delete(k) if dup_keys.key?(k)
    }
    toplevel_keys['classname'] = 'SafeTk'
    toplevel_keys['screen'] = dup_keys.delete('display')

    # other keys used by pack option of container frame

    # create toplevel widget
    begin
      top = TkToplevel.new(toplevel_keys)
    rescue NameError
      fail unless @interp.safe?
      fail SecurityError, "unable create toplevel on the safe interpreter"
    end
    msg = "Untrusted Ruby/Tk applet (#{slave_name})"
    if app_name.kind_of?(String)
      top.title "#{app_name} (#{slave_name})"
    else
      top.title msg
    end

    # procedure to delete slave interpreter
    slave_delete_proc = proc{
      unless slave_ip.deleted?
	#if slave_ip._invoke('info', 'command', '.') != ""
	#  slave_ip._invoke('destroy', '.')
	#end
	#slave_ip.delete
	slave_ip._eval_without_enc('exit')
      end
      top.destroy if top.winfo_exist?
    }
    tag = TkBindTag.new.bind('Destroy', slave_delete_proc)

    top.bindtags = top.bindtags.unshift(tag)

    # create control frame
    TkFrame.new(top, :bg=>'red', :borderwidth=>3, :relief=>'ridge') {|fc|
      fc.bindtags = fc.bindtags.unshift(tag)

      TkFrame.new(fc, :bd=>0){|f|
	TkButton.new(f, 
		     :text=>'Delete', :bd=>1, :padx=>2, :pady=>0, 
		     :highlightthickness=>0, :command=>slave_delete_proc
		     ).pack(:side=>:right, :fill=>:both)
	f.pack(:side=>:right, :fill=>:both, :expand=>true)
      }

      TkLabel.new(fc, :text=>msg, :padx=>2, :pady=>0, 
		  :anchor=>:w).pack(:side=>:left, :fill=>:both, :expand=>true)

      fc.pack(:side=>:bottom, :fill=>:x)
    }

    # container frame for slave interpreter
    dup_keys['fill'] = :both  unless dup_keys.key?('fill')
    dup_keys['expand'] = true unless dup_keys.key?('expand')
    c = TkFrame.new(top, :container=>true).pack(dup_keys)

    # return keys
    loadTk_keys['use'] = TkWinfo.id(c)
    [loadTk_keys, top.path]
  end
  private :__create_safetk_frame

  def __create_safe_slave_obj(safe_opts, app_name, tk_opts)
    # safe interpreter
    ip_name = _create_slave_ip_name
    slave_ip = @interp.create_slave(ip_name, true)
    @slave_ip_tbl[ip_name] = slave_ip

    @interp._eval("::safe::interpInit #{ip_name}")

    slave_ip._invoke('set', 'argv0', app_name) if app_name.kind_of?(String)

    if tk_opts
      tk_opts = __check_safetk_optkeys(tk_opts)
      if tk_opts.key?('use')
	@slave_ip_top[ip_name] = ''
      else
	tk_opts, top_path = __create_safetk_frame(slave_ip, ip_name, app_name, 
						  tk_opts)
	@slave_ip_top[ip_name] = top_path
      end
      @interp._eval("::safe::loadTk #{ip_name} #{_keys2opts(tk_opts)}")
    else
      @slave_ip_top[ip_name] = nil
    end

    if safe_opts.key?('deleteHook') || safe_opts.key?(:deleteHook)
      @interp._eval("::safe::interpConfigure #{ip_name} " + 
		    _keys2opts(safe_opts))
    else
      @interp._eval("::safe::interpConfigure #{ip_name} " + 
		    _keys2opts(safe_opts) + '-deleteHook {' + 
		    TkComm._get_eval_string(proc{|slave|
					      self._default_delete_hook(slave)
					    }) + '}')
    end

    [slave_ip, ip_name]
  end

  def __create_trusted_slave_obj(name, keys)
    ip_name = _create_slave_ip_name
    slave_ip = @interp.create_slave(ip_name, false)
    slave_ip._invoke('set', 'argv0', name) if name.kind_of?(String)
    slave_ip._invoke('set', 'argv', _keys2opts(keys))
    @interp._invoke('load', '', 'Tk', ip_name)
    @slave_ip_tbl[ip_name] = slave_ip
    [slave_ip, ip_name]
  end

  ######################################

  def _create_slave_object(keys={})
    ip = MultiTkIp.new_slave(self, keys={})
    @slave_ip_tbl[ip.name] = ip
  end

  ######################################

  def initialize(master, safeip=true, keys={})
    if $SAFE >= 4
      fail SecurityError, "cannot create a new interpreter at level #{$SAFE}"
    end

    if safeip == nil && $SAFE >= 2
      fail SecurityError, "cannot create a master-ip at level #{$SAFE}"
    end

    if !master.master? && master.safe?
      fail SecurityError, "safe-slave-ip cannot create a new interpreter"
    end

    if safeip == nil && !master.master?
      fail SecurityError, "slave-ip cannot create a master-ip"
    end

    unless keys.kind_of? Hash
      fail ArgumentError, "expecting a Hash object for the 2nd argument"
    end

    @tk_windows = {}
    @tk_table_list = []
    @slave_ip_tbl = {}
    @slave_ip_top = {}

    @tk_windows.taint unless @tk_windows.tainted?
    @tk_table_list.taint unless @tk_table_list.tainted?
    @slave_ip_tbl.taint unless @slave_ip_tbl.tainted?
    @slave_ip_top.taint unless @slave_ip_top.tainted?

    name, safe, safe_opts, tk_opts = _parse_slaveopts(keys)

    safe = 4 if safe && !safe.kind_of?(Fixnum)

    if safeip == nil
      # create master-ip
      @interp = TclTkIp.new(name, _keys2opts(tk_opts))
      @ip_name = nil
      if safe
	safe = $SAFE if safe < $SAFE
	@safe_level = [safe]
      else
	@safe_level = [$SAFE]
      end
    else
      # create slave-ip
      if safeip || master.safe?
	@interp, @ip_name = master.__create_safe_slave_obj(safe_opts, 
							   name, tk_opts)
	if safe
	  safe = master.safe_level if safe < master.safe_level
	  @safe_level = [safe]
	else
	  @safe_level = [4]
	end
      else
	@interp, @ip_name = master.__create_trusted_slave_obj(name, tk_opts)
	if safe
	  safe = master.safe_level if safe < master.safe_level
	  @safe_level = [safe]
	else
	  @safe_level = [master.safe_level]
	end
      end
      @set_alias_proc = proc{|name| 
	master._invoke('interp', 'alias', @ip_name, name, '', name)
      }.freeze
    end

    @system = Object.new

    @threadgroup  = ThreadGroup.new

    @cmd_queue = Queue.new

    @cmd_receiver, @receiver_watchdog = _create_receiver_and_watchdog(@safe_level[0])

    @threadgroup.add @cmd_receiver
    @threadgroup.add @receiver_watchdog

    @threadgroup.enclose

    @@IP_TABLE[@threadgroup] = self
    _init_ip_internal(@@INIT_IP_ENV, @@ADD_TK_PROCS)
    @@TK_TABLE_LIST.size.times{ 
      (tbl = {}).tainted? || tbl.taint
      @tk_table_list << tbl
    }

    self.freeze  # defend against modification
  end

  ######################################

  def _default_delete_hook(slave)
    if @slave_ip_top[slave].kind_of?(String)
      # call default hook of safetk.tcl (ignore exceptions)
      if @slave_ip_top[slave] == ''
	begin
	  @interp._eval("::safe::disallowTk #{slave}")
	rescue
	  warn("Waring: fail to call '::safe::disallowTk'") if $DEBUG
	end
      else # toplevel path
	begin
	  @interp._eval("::safe::tkDelete {} #{@slave_ip_top[slave]} #{slave}")
	rescue
	  warn("Waring: fail to call '::safe::tkDelete'") if $DEBUG
	  begin
	    @interp._eval("destroy #{@slave_ip_top[slave]}")
	  rescue
	    warn("Waring: fail to destroy toplevel") if $DEBUG
	  end
	end
      end
    end
    @slave_ip_tbl.delete(slave)
    @slave_ip_top.delete(slave)
  end
end


# get target IP
class MultiTkIp
  def self._ip_id_
    __getip._ip_id_
  end
  def _ip_id_
    ''
  end

  def self.__getip
    if Thread.current.group == ThreadGroup::Default
      @@DEFAULT_MASTER
    else
      ip = @@IP_TABLE[Thread.current.group]
      unless ip
	fail SecurityError, 
	  "cannot call Tk methods on #{Thread.current.inspect}"
      end
      ip
    end
  end
end


# aliases of constructor
class << MultiTkIp
  alias __new new
  private :__new


  def new_master(keys={})
    ip = __new(__getip, nil, keys)
    ip.eval_proc(proc{$SAFE=ip.safe_level; Proc.new}.call) if block_given?
    ip
  end

  alias new new_master

  def new_slave(keys={})
    ip = __new(__getip, false, keys)
    ip.eval_proc(proc{$SAFE=ip.safe_level; Proc.new}.call) if block_given?
    ip
  end
  alias new_trusted_slave new_slave

  def new_safe_slave(keys={})
    ip = __new(__getip, true, keys)
    ip.eval_proc(proc{$SAFE=ip.safe_level; Proc.new}.call) if block_given?
    ip
  end
  alias new_safeTk new_safe_slave
end


# get info
class MultiTkIp
  def inspect
    s = self.to_s.chop!
    if master?
      s << ':master'
    else
      if @interp.safe?
	s << ':safe-slave'
      else
	s << ':trusted-slave'
      end
    end
    s << '>'
  end

  def master?
    if @ip_name
      false
    else
      true
    end
  end
  def self.master?
    __getip.master?
  end

  def slave?
    not master?
  end
  def self.slave?
  end

  def alive?
    begin
      return false unless @cmd_receiver.alive?
      return false if @interp.deleted?
      return false if @interp._invoke('interp', 'exists', '') == '0'
    rescue Exception
      return false
    end
    true
  end
  def self.alive?
    __getip.alive?
  end

  def path
    @ip_name || ''
  end
  def self.path
    __getip.path
  end
  def ip_name
    @ip_name || ''
  end
  def self.ip_name
    __getip.ip_name
  end
  def to_eval
    @ip_name || ''
  end
  def self.to_eval
    __getip.to_eval
  end

  def slaves(all = false)
    @interp._invoke('interp','slaves').split.map!{|name| 
      if @slave_ip_tbl.key?(name)
	@slave_ip_tbl[name]
      elsif all
	name
      else
	nil
      end
    }.compact!
  end
  def self.slaves(all = false)
    __getip.slaves(all)
  end
end


# instance methods to treat tables
class MultiTkIp
  def _tk_cmd_tbl
    tbl = {}
    MultiTkIp.tk_cmd_tbl.each{|id, ent| tbl[id] = ent if ent.ip == self }
    tbl
  end

  def _tk_windows
    @tk_windows
  end

  def _tk_table_list
    @tk_table_list
  end

  def _add_new_tables
    (@@TK_TABLE_LIST.size - @tk_table_list.size).times{ 
      (tbl = {}).tainted? || tbl.taint
      @tk_table_list << tbl
    }
  end

  def _init_ip_env(script)
    script.call(self)
  end

  def _add_tk_procs(name, args, body)
    return if slave?
    @interp._invoke('proc', name, args, body) if args && body
    @interp._invoke('interp', 'slaves').split.each{|slave|
      @interp._invoke('interp', 'alias', slave, name, '', name)
    }
  end

  def _init_ip_internal(init_ip_env, add_tk_procs)
    init_ip_env.each{|script| script.call(self)}
    add_tk_procs.each{|name, args, body| 
      if master?
	@interp._invoke('proc', name, args, body) if args && body
      else
	@set_alias_proc.call(name)
      end
    }
  end
end


# class methods to treat tables
class MultiTkIp
  def self.tk_cmd_tbl
    @@TK_CMD_TBL
  end
  def self.tk_windows
    __getip._tk_windows
  end
  def self.tk_object_table(id)
    __getip._tk_table_list[id]
  end
  def self.create_table
    #if __getip.slave?
    #  raise SecurityError, "slave-IP has no permission creating a new table"
    #end
    id = @@TK_TABLE_LIST.size
    obj = Object.new
    @@TK_TABLE_LIST << obj
    obj.instance_eval <<-EOD
      def self.method_missing(m, *args)
	 MultiTkIp.tk_object_table(#{id}).__send__(m, *args)
      end
    EOD
    obj.freeze
    @@IP_TABLE.each{|tg, ip| ip._add_new_tables }
    return obj
  end

  def self.init_ip_env(script = Proc.new)
    @@INIT_IP_ENV << script
    @@IP_TABLE.each{|tg, ip| 
      ip._init_ip_env(script)
    }
  end

  def self.add_tk_procs(name, args=nil, body=nil)
    @@ADD_TK_PROCS << [name, args, body]
    @@IP_TABLE.each{|tg, ip| 
      ip._add_tk_procs(name, args, body)
    }
  end

  def self.init_ip_internal
    __getip._init_ip_internal(@@INIT_IP_ENV, @@ADD_TK_PROCS)
  end
end


# for callback operation
class MultiTkIp
  def self.get_cb_entry(cmd)
    @@CB_ENTRY_CLASS.new(__getip, cmd).freeze
  end

  def cb_eval(cmd, *args)
    self.eval_callback{ TkComm._get_eval_string(TkUtil.eval_cmd(cmd, *args)) }
  end
end


# evaluate a procedure on the proper interpreter
class MultiTkIp
  # instance method
  def eval_proc_core(req_val, cmd, *args)
    # cmd string ==> proc
    if cmd.kind_of?(String)
      xcmd  = cmd
      xargs = args
      cmd = proc{ 
	$SAFE=@safe_level[0]
	TkComm._get_eval_string(eval(xcmd, *xargs))
      }
      args = []
    end

    # check
    unless cmd.kind_of?(Proc) || cmd.kind_of?(Method)
      raise RuntimeError, "A Proc object is expected for the 'cmd' argument"
    end

    # on IP thread
    if (@cmd_receiver == Thread.current)
      begin
	ret = cmd.call(*args)
      rescue SystemExit
	# exit IP
	warn("Warning: "+ $! + " on " + self.inspect) if $DEBUG
	begin
	  self._eval_without_enc('exit')
	rescue Exception
	end
	self.delete
	ret = nil
      rescue Exception => e
	warn("Warning: " + e.class.inspect + 
	     ((e.message.length > 0)? ' "' + e.message + '"': '') +  
	     " on " + self.inspect)
	ret =  nil
      end
      return ret
    end
    
    # send cmd to the proc-queue
    unless req_val
      @cmd_queue.enq([nil, cmd, *args])
      return nil
    end

    # send and get return value by exception
    begin
      @cmd_queue.enq([Thread.current, cmd, *args])
      Thread.stop
    rescue MultiTkIp_OK => ret
      # return value
      return ret.value
    rescue SystemExit
      # exit IP
      warn("Warning: " + $! + " on " + self.inspect) if $DEBUG
      begin
	self._eval_without_enc('exit')
      rescue Exception
      end
      self.delete
    rescue Exception => e
      # others --> warning
	warn("Warning: " + e.class.inspect + 
	     ((e.message.length > 0)? ' "' + e.message + '"': '') +  
	     " on " + self.inspect) 
    end
    return nil
  end
  private :eval_proc_core

  def eval_callback(cmd = proc{$SAFE=@safe_level[0]; Proc.new}.call, *args)
    eval_proc_core(false, cmd, *args)
  end

  def eval_proc(cmd = proc{$SAFE=@safe_level[0]; Proc.new}.call, *args)
    eval_proc_core(true, cmd, *args)
  end
  alias call eval_proc
  alias eval_string eval_proc
end
class << MultiTkIp
  # class method
  def eval_proc(cmd = proc{$SAFE=__getip.safe_level; Proc.new}.call, *args)
    # class ==> interp object
    __getip.eval_proc(cmd, *args)
  end
  alias call eval_proc
  alias eval_string eval_proc
end


# event loop
# all master/slave IPs are controled by only one event-loop
class << MultiTkIp
  def mainloop(check_root = true)
    __getip.mainloop(check_root)
  end
  def mainloop_watchdog(check_root = true)
    __getip.mainloop_watchdog(check_root)
  end
  def do_one_event(flag = TclTkLib::EventFlag::ALL)
    __getip.do_one_event(flag)
  end
  def mainloop_abort_on_exception
    # __getip.mainloop_abort_on_exception
    TclTkLib.mainloop_abort_on_exception
  end
  def mainloop_abort_on_exception=(mode)
    # __getip.mainloop_abort_on_exception=(mode)
    TclTkLib.mainloop_abort_on_exception=(mode)
  end
  def set_eventloop_tick(tick)
    __getip.set_eventloop_tick(tick)
  end
  def get_eventloop_tick
    __getip.get_eventloop_tick
  end
  def set_no_event_wait(tick)
    __getip.set_no_event_wait(tick)
  end
  def get_no_event_wait
    __getip.get_no_event_wait
  end
  def set_eventloop_weight(loop_max, no_event_tick)
    __getip.set_eventloop_weight(loop_max, no_event_tick)
  end
  def get_eventloop_weight
    __getip.get_eventloop_weight
  end
end

# class methods to delegate to TclTkIp
class << MultiTkIp
  def method_missing(id, *args)
    __getip.__send__(id, *args)
  end

  def make_safe
    __getip.make_safe
  end

  def safe?
    __getip.safe?
  end

  def exit(st = 0)
    __getip.exit(st)
  end

  def restart(app_name = nil, keys = {})
    init_ip_internal

    __getip._invoke('set', 'argv0', app_name) if app_name
    if keys.kind_of?(Hash)
      __getip._invoke('set', 'argv', _keys2opts(keys))
    end

    __getip.restart
  end

  def _eval(str)
    __getip._eval(str)
  end

  def _invoke(*args)
    __getip._invoke(*args)
  end

  def _eval_without_enc(str)
    __getip._eval_without_enc(str)
  end

  def _invoke_without_enc(*args)
    __getip._invoke_without_enc(*args)
  end

  def _eval_with_enc(str)
    __getip._eval_with_enc(str)
  end

  def _invoke_with_enc(*args)
    __getip._invoke_with_enc(*args)
  end

  def _toUTF8(str, encoding)
    __getip._toUTF8(str, encoding)
  end

  def _fromUTF8(str, encoding)
    __getip._fromUTF8(str, encoding)
  end

  def _thread_vwait(var)
    __getip._thread_vwait(var)
  end

  def _thread_tkwait(mode, target)
    __getip._thread_tkwait(mode, target)
  end

  def _return_value
    __getip._return_value
  end

  def _get_variable(var, flag)
    __getip._get_variable(var, flag)
  end
  def _get_variable2(var, idx, flag)
    __getip._get_variable2(var, idx, flag)
  end
  def _set_variable(var, value, flag)
    __getip._set_variable(var, value, flag)
  end
  def _set_variable2(var, idx, value, flag)
    __getip._set_variable2(var, idx, value, flag)
  end
  def _unset_variable(var, flag)
    __getip._unset_variable(var, flag)
  end
  def _unset_variable2(var, idx, flag)
    __getip._unset_variable2(var, idx, flag)
  end

  def _get_global_var(var)
    __getip._get_global_var(var)
  end
  def _get_global_var2(var, idx)
    __getip._get_global_var2(var, idx)
  end
  def _set_global_var(var, value)
    __getip._set_global_var(var, value)
  end
  def _set_global_var2(var, idx, value)
    __getip._set_global_var2(var, idx, value)
  end
  def _unset_global_var(var)
    __getip._unset_global_var(var)
  end
  def _unset_global_var2(var, idx)
    __getip._unset_global_var2(var, idx)
  end

  def _split_tklist(str)
    __getip._split_tklist(str)
  end
  def _merge_tklist(*args)
    __getip._merge_tklist(*args)
  end
  def _conv_listelement(arg)
    __getip._conv_listelement(arg)
  end
end


# wrap methods on TclTkLib : not permit calling TclTkLib module methods
class << TclTkLib
  def mainloop(check_root = true)
    MultiTkIp.mainloop(check_root)
  end
  def mainloop_watchdog(check_root = true)
    MultiTkIp.mainloop_watchdog(check_root)
  end
  def do_one_event(flag = TclTkLib::EventFlag::ALL)
    MultiTkIp.do_one_event(flag)
  end
  #def mainloop_abort_on_exception
  #  MultiTkIp.mainloop_abort_on_exception
  #end
  #def mainloop_abort_on_exception=(mode)
  #  MultiTkIp.mainloop_abort_on_exception=(mode)
  #end
  def set_eventloop_tick(tick)
    MultiTkIp.set_eventloop_tick(tick)
  end
  def get_eventloop_tick
    MultiTkIp.get_eventloop_tick
  end
  def set_no_event_wait(tick)
    MultiTkIp.set_no_event_wait(tick)
  end
  def get_no_event_wait
    MultiTkIp.get_no_event_wait
  end
  def set_eventloop_weight(loop_max, no_event_tick)
    MultiTkIp.set_eventloop_weight(loop_max, no_event_tick)
  end
  def get_eventloop_weight
    MultiTkIp.get_eventloop_weight
  end
  def restart(*args)
    MultiTkIp.restart(*args)
  end

  def _merge_tklist(*args)
    MultiTkIp._merge_tklist(*args)
  end
  def _conv_listelement(arg)
    MultiTkIp._conv_listelement(arg)
  end
end


# depend on TclTkIp
class MultiTkIp
  def mainloop(check_root = true, restart_on_dead = false)
    return self if self.slave?
    unless restart_on_dead
      @interp.mainloop(check_root)
    else
      begin
	loop do
	  break unless self.alive?
	  if check_root
	    begin
	      break if TclTkLib.num_of_mainwindows == 0
	    rescue Exception
	      break
	    end
	  end
	  @interp.mainloop(check_root)
	end
      rescue StandardError
	if TclTkLib.mainloop_abort_on_exception != nil
	  STDERR.print("Warning: Tk mainloop on ", @interp.inspect, 
		       " receives ", $!.class.inspect, 
		       " exception (ignore) : ", $!.message, "\n");
	end
	retry
      end
    end
    self
  end

  def make_safe
    @interp.make_safe
  end

  def safe?
    @interp.safe?
  end

  def delete
    @slave_ip_tbl.each_value{|subip|
      unless subip.deleted?
	begin
	  subip._invoke('destroy', '.') 
	rescue Exception
	end
	subip.delete 
	#subip._invoke('exit') 
      end
    }
    if safe?
      # do 'exit' to call the delete_hook procedure
      @interp._eval_without_enc('exit')
    end
    @interp.delete unless @interp.deleted?
  end

  def deleted?
    @interp.deleted?
  end

  def exit(st = 0)
    if master?
      Kernel.exit(st)
    else
      delete
      st
    end
  end

  def restart(app_name = nil, keys = {})
    _init_ip_internal(@@INIT_IP_ENV, @@ADD_TK_PROCS)

    @interp._invoke('set', 'argv0', app_name) if app_name
    if keys.kind_of?(Hash)
      @interp._invoke('set', 'argv', _keys2opts(keys))
    end

    @interp.restart
  end

  def __eval(str)
    @interp.__eval(str)
  end

  def __invoke(*args)
    @interp.__invoke(*args)
  end

  def _eval(str)
    @interp._eval(str)
  end

  def _invoke(*args)
    @interp._invoke(*args)
  end

  def _eval_without_enc(str)
    @interp._eval_without_enc(str)
  end

  def _invoke_without_enc(*args)
    @interp._invoke_without_enc(*args)
  end

  def _eval_with_enc(str)
    @interp._eval_with_enc(str)
  end

  def _invoke_with_enc(*args)
    @interp._invoke_with_enc(*args)
  end

  def _toUTF8(str, encoding)
    @interp._toUTF8(str, encoding)
  end

  def _fromUTF8(str, encoding)
    @interp._fromUTF8(str, encoding)
  end

  def _thread_vwait(var)
    @interp._thread_vwait(var)
  end

  def _thread_tkwait(mode, target)
    @interp._thread_tkwait(mode, target)
  end

  def _return_value
    @interp._return_value
  end

  def _get_variable(var, flag)
    @interp._get_variable(var, flag)
  end
  def _get_variable2(var, idx, flag)
    @interp._get_variable2(var, idx, flag)
  end
  def _set_variable(var, value, flag)
    @interp._set_variable(var, value, flag)
  end
  def _set_variable2(var, idx, value, flag)
    @interp._set_variable2(var, idx, value, flag)
  end
  def _unset_variable(var, flag)
    @interp._unset_variable(var, flag)
  end
  def _unset_variable2(var, idx, flag)
    @interp._unset_variable2(var, idx, flag)
  end

  def _get_global_var(var)
    @interp._get_global_var(var)
  end
  def _get_global_var2(var, idx)
    @interp._get_global_var2(var, idx)
  end
  def _set_global_var(var, value)
    @interp._set_global_var(var, value)
  end
  def _set_global_var2(var, idx, value)
    @interp._set_global_var2(var, idx, value)
  end
  def _unset_global_var(var)
    @interp._unset_global_var(var)
  end
  def _unset_global_var2(var, idx)
    @interp._unset_global_var2(var, idx)
  end

  def _split_tklist(str)
    @interp._split_tklist(str)
  end
  def _merge_tklist(*args)
    @interp._merge_tklist(*args)
  end
  def _conv_listelement(arg)
    @interp._conv_listelement(arg)
  end
end


# interp command support
class MultiTkIp
  def _lst2ary(str)
    return [] if str == ""
    idx = str.index('{')
    while idx and idx > 0 and str[idx-1] == ?\\
      idx = str.index('{', idx+1)
    end
    return str.split unless idx

    list = str[0,idx].split
    str = str[idx+1..-1]
    i = -1
    brace = 1
    str.each_byte {|c|
      i += 1
      brace += 1 if c == ?{
      brace -= 1 if c == ?}
      break if brace == 0
    }
    if i == 0
      list.push ''
    elsif str[0, i] == ' '
      list.push ' '
    else
      list.push str[0..i-1]
    end
    #list += _lst2ary(str[i+1..-1])
    list.concat(_lst2ary(str[i+1..-1]))
    list
  end
  private :_lst2ary

  def _slavearg(slave)
    if slave.kind_of?(MultiTkIp)
      slave.path
    elsif slave.kind_of?(String)
      slave
    else
      cmd_name.to_s
    end
  end
  private :_slavearg

  def alias_info(slave, cmd_name)
    _lst2ary(@interp._invoke('interp', 'alias', _slavearg(slave), cmd_name))
  end
  def self.alias_info(slave, cmd_name)
    __getip.alias_info(slave, cmd_name)
  end

  def alias_delete(slave, cmd_name)
    @interp._invoke('interp', 'alias', _slavearg(slave), cmd_name, '')
    self
  end
  def self.alias_delete(slave, cmd_name)
    __getip.alias_delete(slave, cmd_name)
    self
  end

  def def_alias(slave, new_cmd, org_cmd, *args)
    ret = @interp._invoke('interp', 'alias', _slavearg(slave), new_cmd, 
			  '', org_cmd, *args)
    (ret == new_cmd)? self: nil
  end
  def self.def_alias(slave, new_cmd, org_cmd, *args)
    ret = __getip.def_alias(slave, new_cmd, org_cmd, *args)
    (ret == new_cmd)? self: nil
  end

  def aliases(slave = '')
    _lst2ary(@interp._invoke('interp', 'aliases', _slavearg(slave)))
  end
  def self.aliases(slave = '')
    __getip.aliases(slave)
  end

  def delete_slaves(*args)
    slaves = args.collect{|s| _slavearg(s)}
    @interp._invoke('interp', 'delete', *slaves) if slaves.size > 0
    self
  end
  def self.delete_slaves(*args)
    __getip.delete_slaves(*args)
    self
  end

  def exist?(slave = '')
    ret = @interp._invoke('interp', 'exists', _slavearg(slave))
    (ret == '1')? true: false
  end
  def self.exist?(slave = '')
    __getip.exist?(slave)
  end

  def delete_cmd(slave, cmd)
    slave_invoke = @interp._invoke('list', 'rename', cmd, '')
    @interp._invoke('interp', 'eval', _slavearg(slave), slave_invoke)
    self
  end
  def self.delete_cmd(slave, cmd)
    __getip.delete_cmd(slave, cmd)
    self
  end

  def expose_cmd(slave, cmd, aliasname = nil)
    if aliasname
      @interp._invoke('interp', 'expose', _slavearg(slave), cmd, aliasname)
    else
      @interp._invoke('interp', 'expose', _slavearg(slave), cmd)
    end
    self
  end
  def self.expose_cmd(slave, cmd, aliasname = nil)
    __getip.expose_cmd(slave, cmd, aliasname)
    self
  end

  def hide_cmd(slave, cmd, aliasname = nil)
    if aliasname
      @interp._invoke('interp', 'hide', _slavearg(slave), cmd, aliasname)
    else
      @interp._invoke('interp', 'hide', _slavearg(slave), cmd)
    end
    self
  end
  def self.hide_cmd(slave, cmd, aliasname = nil)
    __getip.hide_cmd(slave, cmd, aliasname)
    self
  end

  def hidden_cmds(slave = '')
    _lst2ary(@interp._invoke('interp', 'hidden', _slavearg(slave)))
  end
  def self.hidden_cmds(slave = '')
    __getip.hidden_cmds(slave)
  end

  def invoke_hidden(slave, cmd, *args)
    @interp._invoke('interp', 'invokehidden', _slavearg(slave), cmd, *args)
  end
  def self.invoke_hidden(slave, cmd, *args)
    __getip.invoke_hidden(slave, cmd, *args)
  end

  def invoke_hidden_on_global(slave, cmd, *args)
    @interp._invoke('interp', 'invokehidden', _slavearg(slave), 
		    '-global', cmd, *args)
  end
  def self.invoke_hidden_on_global(slave, cmd, *args)
    __getip.invoke_hidden_on_global(slave, cmd, *args)
  end

  def mark_trusted(slave = '')
    @interp._invoke('interp', 'marktrusted', _slavearg(slave))
    self
  end
  def self.mark_trusted(slave = '')
    __getip.mark_trusted(slave)
    self
  end

  def recursion_limit(slave = '', limit = None)
    number(@interp._invoke('interp', 'recursionlimit', 
			   _slavearg(slave), limit))
  end
  def self.recursion_limit(slave = '', limit = None)
    __getip.recursion_limit(slave)
  end

  def alias_target(aliascmd, slave = '')
    @interp._invoke('interp', 'target', _slavearg(slave), aliascmd)
  end
  def self.alias_target(aliascmd, slave = '')
    __getip.alias_target(aliascmd, slave)
  end

  def share_stdin(dist, src = '')
    @interp._invoke('interp', 'share', src, 'stdin', dist)
    self
  end
  def self.share_stdin(dist, src = '')
    __getip.share_stdin(dist, src)
    self
  end

  def share_stdout(dist, src = '')
    @interp._invoke('interp', 'share', src, 'stdout', dist)
    self
  end
  def self.share_stdout(dist, src = '')
    __getip.share_stdout(dist, src)
    self
  end

  def share_stderr(dist, src = '')
    @interp._invoke('interp', 'share', src, 'stderr', dist)
    self
  end
  def self.share_stderr(dist, src = '')
    __getip.share_stderr(dist, src)
    self
  end

  def transfer_stdin(dist, src = '')
    @interp._invoke('interp', 'transfer', src, 'stdin', dist)
    self
  end
  def self.transfer_stdin(dist, src = '')
    __getip.transfer_stdin(dist, src)
    self
  end

  def transfer_stdout(dist, src = '')
    @interp._invoke('interp', 'transfer', src, 'stdout', dist)
    self
  end
  def self.transfer_stdout(dist, src = '')
    __getip.transfer_stdout(dist, src)
    self
  end

  def transfer_stderr(dist, src = '')
    @interp._invoke('interp', 'transfer', src, 'stderr', dist)
    self
  end
  def self.transfer_stderr(dist, src = '')
    __getip.transfer_stderr(dist, src)
    self
  end

  def share_stdio(dist, src = '')
    @interp._invoke('interp', 'share', src, 'stdin',  dist)
    @interp._invoke('interp', 'share', src, 'stdout', dist)
    @interp._invoke('interp', 'share', src, 'stderr', dist)
    self
  end
  def self.share_stdio(dist, src = '')
    __getip.share_stdio(dist, src)
    self
  end

  def transfer_stdio(dist, src = '')
    @interp._invoke('interp', 'transfer', src, 'stdin',  dist)
    @interp._invoke('interp', 'transfer', src, 'stdout', dist)
    @interp._invoke('interp', 'transfer', src, 'stderr', dist)
    self
  end
  def self.transfer_stdio(dist, src = '')
    __getip.transfer_stdio(dist, src)
    self
  end
end


# Safe Base :: manipulating safe interpreter
class MultiTkIp
  def safeip_configure(slave, slot, value=None)
    # use for '-noStatics' option ==> {statics=>false}
    #     for '-nestedLoadOk' option ==> {nested=>true}
    if slot.kind_of?(Hash)
      ip = MultiTkIp.__getip
      ip._eval('::safe::interpConfigure ' + @ip_name + ' ' + _keys2opts(slot))
    else
      ip._eval('::safe::interpConfigure ' + @ip_name + ' ' + 
	       "-#{slot} #{_get_eval_string(value)}")
    end
    self
  end

  def safeip_configinfo(slot = nil)
    ip = MultiTkIp.__getip
    ret = {}
    if slot
      conf = _lst2ary(ip._eval("::safe::interpConfigure " + 
			       @ip_name + " -#{slot}"))
      if conf[0] == '-deleteHook'
	if conf[1] =~ /^rb_out\S* (c(_\d+_)?\d+)/
	  ret[conf[0][1..-1]] = MultiTkIp._tk_cmd_tbl[$1]
	else
	  ret[conf[0][1..-1]] = conf[1]
	end
      else
	ret[conf[0][1..-1]] = conf[1]
      end
    else
      Hash[*_lst2ary(ip._eval("::safe::interpConfigure " + 
			      @ip_name))].each{|k, v|
	if k == '-deleteHook'
	  if v =~ /^rb_out\S* (c(_\d+_)?\d+)/
	    ret[k[1..-1]] = MultiTkIp._tk_cmd_tbl[$1]
	  else
	    ret[k[1..-1]] = v
	  end
	else
	  ret[k[1..-1]] = v
	end
      }
    end
    ret
  end

  def safeip_delete(slave)
    ip = MultiTkIp.__getip
    ip._eval("::safe::interpDelete " + @ip_name)
  end

  def safeip_add_to_access_path(slave, dir)
    ip = MultiTkIp.__getip
    ip._eval("::safe::interpAddToAccessPath #{@ip_name} #{dir}")
  end

  def safeip_find_in_access_path(slave, dir)
    ip = MultiTkIp.__getip
    ip._eval("::safe::interpFindInAccessPath #{@ip_name} #{dir}")
  end

  def safeip_set_log_cmd(slave, cmd = Proc.new)
    ip = MultiTkIp.__getip
    ip._eval("::safe::setLogCmd #{@ip_name} #{_get_eval_string(cmd)}")
  end
end


# encoding convert
class MultiTkIp
  def encoding
    @interp.encoding
  end
  def encoding=(enc)
    @interp.encoding = enc
  end

  def encoding_convertfrom(str, enc=None)
    @interp.encoding_convertfrom(str, enc)
  end
  alias encoding_convert_from encoding_convertfrom

  def encoding_convertto(str, enc=None)
    @interp.encoding_convertto(str, enc)
  end
  alias encoding_convert_to encoding_convertto
end


# remove methods for security
class MultiTkIp
  undef_method :instance_eval
  undef_method :instance_variable_get
  undef_method :instance_variable_set
end


# end of MultiTkIp definition

# defend against modification
#MultiTkIp.freeze
#TclTkLib.freeze

########################################
#  start Tk which depends on MultiTkIp
module TkCore
  INTERP = MultiTkIp
end
require 'tk'