Initial revision

git-svn-id: http://svn.ruby-lang.org/repos/ruby/trunk@1337 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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diff --git a/doc/irb/irb.rd b/doc/irb/irb.rd
new file mode 100644
index 000000000..77b59639d
--- /dev/null
+++ b/doc/irb/irb.rd
@@ -0,0 +1,377 @@
+irb -- interactive ruby
+				$Release Version: 0.5 $
+			   	$Revision$
+			   	$Date$
+			   	by Keiju ISHITSUKA(keiju@ishitsuka.com)
+				translate from japanese by gotoken-san
+
+==begin
+= What is irb?
+
+irb stands for `interactive ruby'. irb is a tool to execute interactively
+ruby expressions read from stdin. 
+
+= Invoking
+
+  % ruby -r irb -e0
+  % irb
+
+Either of the aboves. In the former style, options can be specified
+as follows:
+
+  % ruby -r irb -e0 -- -v
+
+= Usage
+
+Use of irb is easy if you know ruby.  Executing irb, prompts are 
+displayed as follows. Then, enter expression of ruby. A input is
+executed when it is syntacticaly completed. 
+
+  dim% irb
+  irb(main):001:0> 1+2
+  3
+  irb(main):002:0> class Foo
+  irb(main):003:1>  def foo
+  irb(main):004:2>    print 1
+  irb(main):005:2>  end
+  irb(main):006:1> end
+  nil
+  irb(main):007:0> 
+
+And, Readline extesion module can be used with irb. Using Readline
+is the standard default action if Readline is installed. 
+
+= Command line option
+
+  irb.rb [options] file_name opts
+  options:
+  -f		    suppress read ~/.irbrc 
+  -m		    bc mode (fraction or matrix are available)
+  -d                set $DEBUG  to true (same as `ruby -d')
+  -r load-module    same as `ruby -r'
+  --inspect	    uses `inspect' for output (the default except bc mode)
+  --noinspect	    doesn't uses inspect for output
+  --readline	    uses Readline extension module
+  --noreadline	    doesn't use Readline extension module
+  --prompt prompt-mode
+  --prompt-mode prompt-mode
+		    switches prompt mode. Pre-defined prompt modes are
+		    `defalut', `simple', `xmp' and `inf-ruby'
+			    
+  --inf-ruby-mode   uses prompt appreciate for inf-ruby-mode on emacs. 
+		    Suppresses --readline. 
+  --simple-prompt   simple prompt mode
+  --noprompt	    no prompt
+  --tracer	    display trace for each execution of commands.
+  --back-trace-limit n
+		    displayes backtrace top n and tail n. The default
+		    value is 16. 
+  --irb_debug n	    sets internal debug level to n (It shouldn't be used)
+  -v, --version	    prints the version of irb
+
+
+
+= Configurations
+
+irb reads `~/.irbrc' when it is invoked. If `~/.irbrb' doesn't exist
+irb try to read in the order `.irbrc', `irb.rc', `_irbrc' then `$irbrc'. 
+
+The following is altanative to the command line option. To use them
+type as follows in an irb session. 
+
+  IRB.conf[:IRB_NAME]="irb"
+  IRB.conf[:MATH_MODE]=false
+  IRB.conf[:USE_TRACER]=false
+  IRB.conf[:USE_LOADER]=false
+  IRB.conf[:IGNORE_SIGINT]=true
+  IRB.conf[:IGNORE_EOF]=false
+  IRB.conf[:INSPECT_MODE]=nil
+  IRB.conf[:IRB_RC] = nil
+  IRB.conf[:BACK_TRACE_LIMIT]=16
+  IRB.conf[:USE_LOADER] = false
+  IRB.conf[:USE_READLINE] = nil
+  IRB.conf[:USE_TRACER] = false
+  IRB.conf[:IGNORE_SIGINT] = true
+  IRB.conf[:IGNORE_EOF] = false
+  IRB.conf[:PROMPT_MODE] = :DEFALUT
+  IRB.conf[:PROMPT] = {...}
+  IRB.conf[:DEBUG_LEVEL]=0
+  IRB.conf[:VERBOSE]=true
+
+== Customizing prompt
+
+To costomize the prompt you set a variable
+
+  IRB.conf[:PROMPT]
+
+For example, describe as follows in `.irbrc'. 
+
+  IRB.conf[:PROMPT][:MY_PROMPT] = { # name of prompt mode
+    :PROMPT_I => nil,		  # normal prompt
+    :PROMPT_S => nil,		  # prompt for continuated strings
+    :PROMPT_C => nil,		  # prompt for continuated statement
+    :RETURN => "    ==>%s\n"	  # format to return value
+  }
+
+Then, invoke irb with the above prompt mode by
+
+  % irb --prompt my-prompt
+
+Or add the following in `.irbrc'. 
+
+  IRB.conf[:PROMPT_MODE] = :MY_PROMPT
+
+Constants PROMPT_I, PROMPT_S and PROMPT_C specifies the format. 
+In the prompt specification, some special strings are available. 
+
+  %N	command name which is running
+  %m	to_s of main object (self)
+  %M	inspect of main object (self)
+  %l	type of string(", ', /, ]), `]' is inner %w[...]
+  %NNi	indent level. NN is degits and means as same as printf("%NNd"). 
+        It can be ommited
+  %NNn	line number. 
+  %%    %
+
+For instance, the default prompt mode is defined as follows:
+
+IRB.conf[:PROMPT_MODE][:DEFAULT] = {
+      :PROMPT_I => "%N(%m):%03n:%i> ",
+      :PROMPT_S => "%N(%m):%03n:%i%l ",
+      :PROMPT_C => "%N(%m):%03n:%i* ",
+      :RETURN => "%s\n"
+} 
+
+RETURN is used to printf. 
+
+== Configurating subirb
+
+The command line option or IRB.conf specify the default behavior of
+(sub)irb. On the other hand, each conf of in the next sction `6. Command' 
+is used to individually configurate (sub)irb. 
+
+If proc is set to IRB.conf[:IRB_RC], its subirb will be invoked after
+execution of that proc under giving the context of irb as its
+aregument. By this mechanism each subirb can be configurated. 
+
+= Command
+
+For irb commands, both simple name and `irb_'-prefixed name are prepared. 
+
+--- exit, quit, irb_exit	
+    Quits (sub)irb. 
+    if you've done cb (see below), exit from the binding mode.
+
+--- conf, irb_context
+    Displays current configuration. Modifing the configuration is
+    achieved by sending message to `conf'. 
+
+--- conf.back_trace_limit
+    Sets display lines of backtrace as top n and tail n. 
+    The default value is 16.
+    
+--- conf.debug_level = N
+    Sets debug level of irb. 
+
+--- conf.ignore_eof = true/false
+    Whether ^D (control-d) will be ignored or not. 
+    If false is set, ^D means quit. 
+
+--- conf.ignore_sigint= true/false
+    Whether ^C (control-c) will be ignored or not. 
+    If false is set, ^D means quit.  If true, 
+      during input:   cancel inputing then return to top level. 
+      during execute: abondon current execution. 
+
+--- conf.inf_ruby_mode = true/false
+    Whether inf-ruby-mode or not. The default value is false.
+
+--- conf.inspect_mode = true/false/nil
+    Specifies inspect mode. 
+    true:  display inspect
+    false: display to_s
+    nil:   inspect mode in non math mode, 
+           non inspect mode in math mode. 
+
+--- conf.irb_level
+    The level of cb. 
+
+--- conf.math_mode
+    Whether bc mode or not. 
+
+--- conf.use_loader = true/false
+    Whether irb's own file reader method is used when load/require or not. 
+    This mode is globaly affected (irb wide). 
+
+--- conf.prompt_c
+    prompt for a continuating statement (e.g, immediately after of `if')
+
+--- conf.prompt_i
+    standard prompt
+
+--- conf.prompt_s
+    prompt for a continuating string
+
+--- conf.rc
+    Whether ~/.irbrc is read or not. 
+
+--- conf.use_prompt = true/false
+    Prompting or not. 
+
+--- conf.use_readline = true/false/nil
+    Whether readline is used or not. 
+    true: uses 
+    false: doen't use
+    nil: intends to use readline except for inf-reuby-mode (default)
+
+--- conf.verbose=T/F
+    Whether verbose messages are display or not. 
+
+--- cb, irb_change_binding [obj]
+    Enter new binding which has a distinct scope of local variables. 
+    If obj is given, obj will be self. 
+
+--- irb [obj]
+    Invoke subirb. If obj is given, obj will be self. 
+
+--- jobs, irb_jobs
+    List of subirb
+
+--- fg n, irb_fg n
+    Switch into specified subirb. The following is candidates of n:
+
+      irb number
+      thhread
+      irb object
+      self(obj which is specified of irb obj)
+
+--- kill n, irb_kill n
+    Kill subirb. The means of n is as same as the case of irb_fg. 
+
+= System variable
+
+   _  The latest value of evaluation (it is local)
+
+
+= Session Example
+
+  dim% ruby irb.rb
+  irb(main):001:0> irb                        # invoke subirb
+  irb#1(main):001:0> jobs                     # list of subirbs
+  #0->irb on main (#<Thread:0x400fb7e4> : stop)
+  #1->irb#1 on main (#<Thread:0x40125d64> : running)
+  nil
+  irb#1(main):002:0> fg 0                     # switch job
+  nil
+  irb(main):002:0> class Foo;end
+  nil
+  irb(main):003:0> irb Foo                    # invoke subirb which has the 
+					      #              context of Foo
+  irb#2(Foo):001:0> def foo                   # define Foo#foo
+  irb#2(Foo):002:1>   print 1
+  irb#2(Foo):003:1> end
+  nil
+  irb#2(Foo):004:0> fg 0                      # switch job
+  nil
+  irb(main):004:0> jobs                       # list of job
+  #0->irb on main (#<Thread:0x400fb7e4> : running)
+  #1->irb#1 on main (#<Thread:0x40125d64> : stop)
+  #2->irb#2 on Foo (#<Thread:0x4011d54c> : stop)
+  nil
+  irb(main):005:0> Foo.instance_methods       # Foo#foo is defined asurely
+  ["foo"]
+  irb(main):006:0> fg 2                       # switch job
+  nil
+  irb#2(Foo):005:0> def bar                   # define Foo#bar
+  irb#2(Foo):006:1>  print "bar"
+  irb#2(Foo):007:1> end
+  nil
+  irb#2(Foo):010:0>  Foo.instance_methods
+  ["bar", "foo"]
+  irb#2(Foo):011:0> fg 0                      
+  nil
+  irb(main):007:0> f = Foo.new
+  #<Foo:0x4010af3c>
+  irb(main):008:0> irb f                      # invoke subirb which has the
+					      #  context of f (instance of Foo)
+  irb#3(#<Foo:0x4010af3c>):001:0> jobs
+  #0->irb on main (#<Thread:0x400fb7e4> : stop)
+  #1->irb#1 on main (#<Thread:0x40125d64> : stop)
+  #2->irb#2 on Foo (#<Thread:0x4011d54c> : stop)
+  #3->irb#3 on #<Foo:0x4010af3c> (#<Thread:0x4010a1e0> : running)
+  nil
+  irb#3(#<Foo:0x4010af3c>):002:0> foo         # evaluate f.foo
+  1nil
+  irb#3(#<Foo:0x4010af3c>):003:0> bar         # evaluate f.bar
+  barnil
+  irb#3(#<Foo:0x4010af3c>):004:0> kill 1, 2, 3# kill job
+  nil
+  irb(main):009:0> jobs
+  #0->irb on main (#<Thread:0x400fb7e4> : running)
+  nil
+  irb(main):010:0> exit                       # exit
+  dim% 
+
+= Restrictions
+
+Because irb evaluates the inputs immediately after the imput is
+syntactically completed, irb gives slight different result than
+directly use ruby. Known difference is pointed out here. 
+
+
+== Declaration of the local variable
+
+The following causes an error in ruby:
+
+  eval "foo = 0"
+  foo
+  --
+  -:2: undefined local variable or method `foo' for #<Object:0x40283118> (NameError)
+  ---
+  NameError
+
+Though, the above will successfully done by irb. 
+
+  >> eval "foo = 0"
+ => 0
+ >> foo
+ => 0
+
+Ruby evaluates a code after reading entire of code and determination
+of the scope of local variables. On the other hand, irb do
+immediately. More precisely, irb evaluate at first
+
+  evel "foo = 0" 
+
+then foo is defined on this timing. It is because of this
+incompatibility.
+
+If you'd like to detect those differences, begin...end can be used:
+
+  >> begin
+  ?>   eval "foo = 0"
+  >>   foo
+  >> end
+  NameError: undefined local variable or method `foo' for #<Object:0x4013d0f0>
+  (irb):3
+  (irb_local_binding):1:in `eval'
+
+== Here-document
+
+Implementation of Here-document is incomplete. 
+
+== Symbol
+
+Irb can not always recognize a symbol as to be Symbol. Concretely, an
+expression have completed, however Irb regard it as continuation line.
+
+==end
+
+% Begin Emacs Environment
+% Local Variables:
+% mode: text
+% comment-column: 0
+% comment-start: "%"
+% comment-end: "\n"
+% End:
+%
diff --git a/doc/irb/irb.rd.jp b/doc/irb/irb.rd.jp
new file mode 100644
index 000000000..cf65d3e3c
--- /dev/null
+++ b/doc/irb/irb.rd.jp
@@ -0,0 +1,391 @@
+irb -- interactive ruby
+				$Release Version: 0.6 $
+			   	$Revision$
+			   	$Date$
+			   	by Keiju ISHITSUKA(keiju@ishitsuka.com)
+==begin
+= irb$B$H$O(B?
+
+irb$B$O(Binteractive ruby$B$NN,$G$9(B. ruby$B$N<0$rI8=`F~NO$+$i4JC1$KF~NO(B/$B<B9T$9(B
+$B$k$?$a$N%D!<%k$G$9(B.
+
+= $B5/F0(B
+
+  % ruby -r irb -e0
+  % irb
+
+$B$N$$$:$l$+$G9T$J$$$^$9(B. $BA0<T$N>l9g(Birb$B$X$N%*%W%7%g%s;XDj$O(B, $B0J2<$N$h$&$K(B
+$B$J$j$^$9(B.
+
+  % ruby -r irb -e0 -- -v
+
+= $B;H$$J}(B
+
+irb$B$N;H$$J}$O(B, Ruby$B$5$(CN$C$F$$$l$P$$$?$C$F4JC1$G$9(B. $B4pK\E*$K$O(B irb $B$H(B
+$B$$$&%3%^%s%I$r<B9T$9$k$@$1$G$9(B. irb$B$r<B9T$9$k$H(B, $B0J2<$N$h$&$J%W%m%s%W(B
+$B%H$,I=$l$F$-$^$9(B. $B8e$O(B, ruby$B$N<0$rF~$l$F2<$5$$(B. $B<0$,407k$7$?;~E@$G<B9T(B
+$B$5$l$^$9(B.
+
+  dim% irb
+  irb(main):001:0> 1+2
+  3
+  irb(main):002:0> class Foo
+  irb(main):003:1>  def foo
+  irb(main):004:2>    print 1
+  irb(main):005:2>  end
+  irb(main):006:1> end
+  nil
+  irb(main):007:0> 
+
+$B$^$?(B, irb$B$O(BReadline$B%b%8%e!<%k$K$bBP1~$7$F$$$^$9(B. Readline$B%b%8%e!<%k$,(B
+$B%$%s%9%H!<%k$5$l$F$$$k;~$K$O(B, $B$=$l$r;H$&$N$,I8=`$NF0:n$K$J$j$^$9(B.
+
+= $B%3%^%s%I%*%W%7%g%s(B
+
+  irb.rb [options] file_name opts
+  options:
+  -f		    ~/.irbrc $B$rFI$_9~$^$J$$(B.
+  -m		    bc$B%b!<%I(B($BJ,?t(B, $B9TNs$N7W;;$,$G$-$k(B)
+  -d                $DEBUG $B$r(Btrue$B$K$9$k(B(ruby -d $B$HF1$8(B)
+  -r load-module    ruby -r $B$HF1$8(B.
+  --inspect	    $B7k2L=PNO$K(Binspect$B$rMQ$$$k(B(bc$B%b!<%I0J30$O%G%U%)%k%H(B). 
+  --noinspect	    $B7k2L=PNO$K(Binspect$B$rMQ$$$J$$(B.
+  --readline	    readline$B%i%$%V%i%j$rMxMQ$9$k(B.
+  --noreadline	    readline$B%i%$%V%i%j$rMxMQ$7$J$$(B. $B%G%U%)%k%H$NF0:n$O(B,
+		    inf-reuby-mode$B0J30$G(Breadline$B%i%$%V%i%j$rMxMQ$7$h$&(B
+		    $B$H$9$k(B. 
+  --prompt prompt-mode
+  --prompt-mode prompt-mode
+		    $B%W%m%s%W%H%b!<%I$r@ZBX$($^$9(B. $B8=:_Dj5A$5$l$F$$$k%W(B
+		    $B%m%s%W%H%b!<%I$O(B, defalut, simple, xmp, inf-ruby$B$,(B
+		    $BMQ0U$5$l$F$$$^$9(B. $B%G%U%)%k%H$O(Bdefault$B%W%m%s%W%H%b!<(B
+		    $B%I$K$J$C$F$$$^$9(B.
+			    
+  --inf-ruby-mode   emacs$B$N(Binf-ruby-mode$BMQ$N%W%m%s%W%HI=<($r9T$J$&(B. $BFC(B
+		    $B$K;XDj$,$J$$8B$j(B, readline$B%i%$%V%i%j$O;H$o$J$/$J$k(B.
+  --simple-prompt
+		    $BHs>o$K%7%s%W%k$J%W%m%s%W%H$rMQ$$$k%b!<%I$G$9(B.
+  --noprompt	    $B%W%m%s%W%HI=<($r9T$J$o$J$$(B.
+  --tracer	    $B%3%^%s%I<B9T;~$K%H%l!<%9$r9T$J$&(B.
+  --back-trace-limit n
+		    $B%P%C%/%H%l!<%9I=<($r%P%C%/%H%l!<%9$NF,$+$i(B n, $B8e$m(B
+		    $B$+$i(Bn$B$@$19T$J$&(B. $B%G%U%)%k%H$O(B16 
+  --irb_debug n	    irb$B$N%G%P%C%0%G%P%C%0%l%Y%k$r(Bn$B$K@_Dj$9$k(B($BMxMQ$7$J(B
+		    $B$$J}$,L5Fq$G$7$g$&(B).
+  -v, --version	    irb$B$N%P!<%8%g%s$rI=<($9$k(B
+
+= $B%3%s%U%#%.%e%l!<%7%g%s(B
+
+irb$B5/F0;~$K(B``~/.irbrc''$B$rFI$_9~$_$^$9(B. $B$b$7B8:_$7$J$$>l9g$O(B,
+``.irbrc'', ``irb.rc'', ``_irbrc'', ``$irbrc''$B$N=g$K(Bload$B$r;n$_$^$9(B.
+
+$B%*%W%7%g%s$r@_Dj$9$kBe$o$j$K(B, $B0J2<$N%3%^%s%I$G$b%G%U%)%k%H$NF0:n$r@_Dj(B
+$B$G$-$^$9(B.
+
+  IRB.conf[:IRB_NAME]="irb"
+  IRB.conf[:MATH_MODE]=false
+  IRB.conf[:USE_TRACER]=false
+  IRB.conf[:USE_LOADER]=false
+  IRB.conf[:IGNORE_SIGINT]=true
+  IRB.conf[:IGNORE_EOF]=false
+  IRB.conf[:INSPECT_MODE]=nil
+  IRB.conf[:IRB_RC] = nil
+  IRB.conf[:BACK_TRACE_LIMIT]=16
+  IRB.conf[:USE_LOADER] = false
+  IRB.conf[:USE_READLINE] = nil
+  IRB.conf[:USE_TRACER] = false
+  IRB.conf[:IGNORE_SIGINT] = true
+  IRB.conf[:IGNORE_EOF] = false
+  IRB.conf[:PROMPT_MODE] = :DEFALUT
+  IRB.conf[:PROMPT] = {...}
+  IRB.conf[:DEBUG_LEVEL]=0
+  IRB.conf[:VERBOSE]=true
+
+== $B%W%m%s%W%H$N@_Dj(B
+
+$B%W%m%s%W%H$r%+%9%?%^%$%:$7$?$$;~$K$O(B, 
+
+   IRB.conf[:PROMPT]
+
+$B$rMQ$$$^$9(B. $BNc$($P(B, .irbrc$B$NCf$G2<$N$h$&$J<0$r5-=R$7$^$9(B:
+
+   IRB.conf[:PROMPT][:MY_PROMPT] = { # $B%W%m%s%W%H%b!<%I$NL>A0(B
+     :PROMPT_I => nil,		  # $BDL>o$N%W%m%s%W%H(B
+     :PROMPT_S => nil,		  # $BJ8;zNs$J$I$N7QB39T$N%W%m%s%W%H(B
+     :PROMPT_C => nil,		  # $B<0$,7QB3$7$F$$$k;~$N%W%m%s%W%H(B
+     :RETURN => "    ==>%s\n"	  # $B%j%?!<%s;~$N%W%m%s%W%H(B
+   }
+
+$B%W%m%s%W%H%b!<%I$r;XDj$7$?$$;~$K$O(B,
+
+  irb --prompt my-prompt
+
+$B$G$=$N%W%m%s%W%H%b!<%I$G5/F0$5$l$^$9(B. $B$^$?$O(B, .irbrc$B$K2<<0$r5-=R$7$F$b(B
+OK$B$G$9(B.
+
+  IRB.conf[:PROMPT_MODE] = :MY_PROMPT
+
+PROMPT_I, PROMPT_S, PROMPT_C$B$O(B, $B%U%)!<%^%C%H$r;XDj$7$^$9(B.
+
+  %N	$B5/F0$7$F$$$k%3%^%s%IL>$,=PNO$5$l$k(B.
+  %m	main$B%*%V%8%'%/%H(B(self)$B$,(Bto_s$B$G=PNO$5$l$k(B.
+  %M	main$B%*%V%8%'%/%H(B(self)$B$,(Binspect$B$5$l$F=PNO$5$l$k(B.
+  %l	$BJ8;zNsCf$N%?%$%W$rI=$9(B(", ', /, ], `]'$B$O(B%w$B$NCf$N;~(B)
+  %NNi	$B%$%s%G%s%H$N%l%Y%k$rI=$9(B. NN$B$O?t;z$,F~$j(Bprintf$B$N(B%NNd$B$HF1$8(B. $B>J(B
+	$BN,2DG=(B
+  %NNn	$B9THV9f$rI=$7$^$9(B.
+  %%    %
+
+$BNc$($P(B, $B%G%U%)%k%H$N%W%m%s%W%H%b!<%I$O(B:
+
+  IRB.conf[:PROMPT_MODE][:DEFAULT] = {
+      :PROMPT_I => "%N(%m):%03n:%i> ",
+      :PROMPT_S => "%N(%m):%03n:%i%l ",
+      :PROMPT_C => "%N(%m):%03n:%i* ",
+      :RETURN => "%s\n"
+  } 
+
+$B$H$J$C$F$$$^$9(B.
+
+RETURN$B$O(B, $B8=:_$N$H$3$m(Bprintf$B7A<0$G$9(B. $B>-Mh;EMM$,JQ$o$k$+$bCN$l$^$;$s(B.
+
+== $B%5%V(Birb$B$N@_Dj(B
+
+$B%3%^%s%I%i%$%s%*%W%7%g%s$*$h$S(BIRB.conf$B$O(B($B%5%V(B)irb$B5/F0;~$N%G%U%)%k%H$N(B
+$B@_Dj$r7h$a$k$b$N$G(B, `5. $B%3%^%s%I(B'$B$K$"$k(Bconf$B$G8DJL$N(B($B%5%V(B)irb$B$N@_Dj$,$G(B
+$B$-$k$h$&$K$J$C$F$$$^$9(B.
+
+IRB.conf[:IRB_RC]$B$K(Bproc$B$,@_Dj$5$l$F$$$k$H(B, $B%5%V(Birb$B$r5/F0$9$k;~$K$=$N(B
+proc$B$r(Birb$B$N%3%s%F%-%9%H$r0z?t$H$7$F8F$S=P$7$^$9(B. $B$3$l$K$h$C$F8DJL$N%5(B
+$B%V(Birb$B$4$H$K@_Dj$rJQ$($k$3$H$,$G$-$k$h$&$K$J$j$^$9(B.
+
+
+= $B%3%^%s%I(B
+
+irb$B3HD%%3%^%s%I$O(B, $B4JC1$JL>A0$HF,$K(B`irb_'$B$r$D$1$?L>A0$HN>J}Dj5A$5$l$F(B
+$B$$$^$9(B. $B$3$l$O(B, $B4JC1$JL>A0$,(Boverride$B$5$l$?;~$N$?$a$G$9(B.
+
+--- exit, quit, irb_exit	
+    $B=*N;$9$k(B. 
+    $B%5%V(Birb$B$N>l9g(B, $B$=$N%5%V(Birb$B$r=*N;$9$k(B.
+    cb$B$7$F$$$k>l9g(B, $B$=$N%P%$%s%G%#%s%0$N%b!<%I$r=*N;$9$k(B.
+
+--- conf, irb_context
+    irb$B$N8=:_$N@_Dj$rI=<($9$k(B. $B@_Dj$NJQ99$O(B, conf$B$K%a%C%;!<%8$rAw$k$3(B
+    $B$H$K$h$C$F9T$J$($k(B. 
+
+--- conf.back_trace_limit
+    $B%P%C%/%H%l!<%9I=<($r%P%C%/%H%l!<%9$NF,$+$i(Bn, $B8e$m$+$i(Bn$B$@$19T$J$&(B.
+    $B%G%U%)%k%H$O(B16
+    
+--- conf.debug_level = N
+    irb$BMQ$N%G%P%C%0%l%Y%k$N@_Dj(B
+
+--- conf.ignore_eof = true/false
+    ^D$B$,F~NO$5$l$?;~$NF0:n$r@_Dj$9$k(B. true$B$N;~$O(B^D$B$rL5;k$9$k(B, false$B$N(B
+    $B;~$O(Birb$B$r=*N;$9$k(B. 
+
+--- conf.ignore_sigint= true/false
+    ^C$B$,F~NO$5$l$?;~$NF0:n$r@_Dj$9$k(B. false$B;~$O(B, irb$B$r=*N;$9$k(B. true$B$N(B
+    $B;~$NF0:n$O0J2<$N$h$&$K$J$k(B:
+      $BF~NOCf(B: $B$3$l$^$GF~NO$7$?$b$N$r%-%c%s%;%k$7%H%C%W%l%Y%k$KLa$k(B. 
+      $B<B9TCf(B: $B<B9T$rCf;_$9$k(B.
+
+--- conf.inf_ruby_mode = true/false
+    inf-ruby-mode$BMQ$N%W%m%s%W%HI=<($r9T$J$&(B. $B%G%U%)%k%H$O(Bfalse.
+
+--- conf.inspect_mode = true/false/nil
+    $B%$%s%9%Z%/%H%b!<%I$r@_Dj$9$k(B.
+    true: $B%$%s%9%Z%/%H$7$FI=<($9$k(B.
+    false: $BDL>o$N(Bprint$B$GI=<($9$k(B.
+    nil: $BDL>o%b!<%I$G$"$l$P(B, inspect mode$B$H$J$j(B, math$B%b!<%I$N;~$O(B, non
+	 inspect mode$B$H$J$k(B.   
+
+--- conf.irb_level
+    $B;2>H$N$_(B. irb$B$,2?CJ(Bcb$B$7$F$$$k$+(B?
+
+--- conf.math_mode
+    $B;2>H$N$_(B. bc$B%b!<%I(B($BJ,?t(B, $B9TNs$N7W;;$,$G$-$^$9(B)$B$+$I$&$+(B?
+
+--- conf.use_loader = true/false
+    load/require$B;~$K(Birb$B$N(Bfile$BFI$_9~$_5!G=$rMQ$$$k%b!<%I$N%9%$%C%A(B($B%G%U%)(B
+    $B%k%H$OMQ$$$J$$(B). $B$3$N%b!<%I$O(BIRB$BA4BN$KH?1G$5$l$k(B.
+
+--- conf.prompt_c
+    if$B$ND>8e$J$I(B, $B9T$,7QB3$7$F$$$k;~$N%W%m%s%W%H(B.
+
+--- conf.prompt_i
+    $BDL>o$N%W%m%s%W%H(B.
+
+--- conf.prompt_s
+    $BJ8;zNsCf$J$I$rI=$9%W%m%s%W%H(B.
+
+--- conf.rc
+    ~/.irbrc$B$rFI$_9~$s$@$+$I$&$+(B?
+
+--- conf.use_prompt = true/false
+    $B%W%m%s%W%HI=<($9$k$+$I$&$+(B? $B%G%U%)%k%H$G$O%W%m%s%W%H$rI=<($9$k(B.
+
+--- conf.use_readline = true/false/nil
+    readline$B$r;H$&$+$I$&$+(B?
+    true: readline$B$r;H$&(B.
+    false: readline$B$r;H$o$J$$(B.
+    nil: ($B%G%U%)%k%H(B)inf-reuby-mode$B0J30$G(Breadline$B%i%$%V%i%j$rMxMQ$7$h(B
+         $B$&$H$9$k(B.  
+
+--- conf.verbose=T/F
+    irb$B$+$i$$$m$$$m$J%a%C%;!<%8$r=PNO$9$k$+(B?
+
+--- cb, irb_change_binding [obj]
+    $B%m!<%+%kJQ?t$N%9%3!<%W$,0c$&?7$?$J(Bbinding$B$K0\$k(B.  obj$B$,;XDj$5$l$?(B
+    $B;~$O(B, $B$=$N(Bobj$B$r(Bself$B$H$9$k(B. 
+
+--- irb [obj]
+    $B%5%V(Birb$B$rN)$A$"$2$k(B. obj$B$,;XDj$5$l$?;~$O(B, $B$=$N(Bobj$B$r(Bself$B$H$9$k(B.
+
+--- jobs, irb_jobs
+    $B%5%V(Birb$B$N%j%9%H(B
+
+--- fg n, irb_fg n
+    $B;XDj$7$?%5%V(Birb$B$K%9%$%C%A$9$k(B. n$B$O(B, $B<!$N$b$N$r;XDj$9$k(B.
+
+      irb$BHV9f(B
+      $B%9%l%C%I(B
+      irb$B%*%V%8%'%/%H(B
+      self(irb obj$B$G5/F0$7$?;~$N(Bobj)
+
+--- kill n, irb_kill n
+      $B%5%V(Birb$B$r(Bkill$B$9$k(B. n$B$O(Bfg$B$HF1$8(B.
+
+
+= $B%7%9%F%`JQ?t(B
+
+   _  $BA0$N7W;;$N<B9T7k2L$r3P$($F$$$k(B($B%m!<%+%kJQ?t(B).
+
+=  $B;HMQNc(B
+
+$B0J2<$N$h$&$J46$8$G$9(B.
+
+  dim% ruby irb.rb
+  irb(main):001:0> irb                        # $B%5%V(Birb$B$NN)$A$"$2(B
+  irb#1(main):001:0> jobs                     # $B%5%V(Birb$B$N%j%9%H(B
+  #0->irb on main (#<Thread:0x400fb7e4> : stop)
+  #1->irb#1 on main (#<Thread:0x40125d64> : running)
+  nil
+  irb#1(main):002:0> fg 0                     # job$B$N%9%$%C%A(B
+  nil
+  irb(main):002:0> class Foo;end
+  nil
+  irb(main):003:0> irb Foo                    # Foo$B$r%3%s%F%-%9%H$7$F(Birb
+					      # $BN)$A$"$2(B
+  irb#2(Foo):001:0> def foo                   # Foo#foo$B$NDj5A(B
+  irb#2(Foo):002:1>   print 1
+  irb#2(Foo):003:1> end
+  nil
+  irb#2(Foo):004:0> fg 0                      # job$B$r%9%$%C%A(B
+  nil
+  irb(main):004:0> jobs                       # job$B$N%j%9%H(B
+  #0->irb on main (#<Thread:0x400fb7e4> : running)
+  #1->irb#1 on main (#<Thread:0x40125d64> : stop)
+  #2->irb#2 on Foo (#<Thread:0x4011d54c> : stop)
+  nil
+  irb(main):005:0> Foo.instance_methods       # Foo#foo$B$,$A$c$s$HDj5A$5(B
+					      # $B$l$F$$$k(B
+  ["foo"]
+  irb(main):006:0> fg 2                       # job$B$r%9%$%C%A(B
+  nil
+  irb#2(Foo):005:0> def bar                   # Foo#bar$B$rDj5A(B
+  irb#2(Foo):006:1>  print "bar"
+  irb#2(Foo):007:1> end
+  nil
+  irb#2(Foo):010:0>  Foo.instance_methods
+  ["bar", "foo"]
+  irb#2(Foo):011:0> fg 0                      
+  nil
+  irb(main):007:0> f = Foo.new
+  #<Foo:0x4010af3c>
+  irb(main):008:0> irb f                      # Foo$B$N%$%s%9%?%s%9$G(Birb$B$r(B
+					      # $BN)$A$"$2$k(B.
+  irb#3(#<Foo:0x4010af3c>):001:0> jobs
+  #0->irb on main (#<Thread:0x400fb7e4> : stop)
+  #1->irb#1 on main (#<Thread:0x40125d64> : stop)
+  #2->irb#2 on Foo (#<Thread:0x4011d54c> : stop)
+  #3->irb#3 on #<Foo:0x4010af3c> (#<Thread:0x4010a1e0> : running)
+  nil
+  irb#3(#<Foo:0x4010af3c>):002:0> foo         # f.foo$B$N<B9T(B
+  nil
+  irb#3(#<Foo:0x4010af3c>):003:0> bar         # f.bar$B$N<B9T(B
+  barnil
+  irb#3(#<Foo:0x4010af3c>):004:0> kill 1, 2, 3# job$B$N(Bkill
+  nil
+  irb(main):009:0> jobs
+  #0->irb on main (#<Thread:0x400fb7e4> : running)
+  nil
+  irb(main):010:0> exit                       # $B=*N;(B
+  dim% 
+
+= $B;HMQ>e$N@)8B(B
+
+irb$B$O(B, $BI>2A$G$-$k;~E@(B($B<0$,JD$8$?;~E@(B)$B$G$NC`<!<B9T$r9T$J$$$^$9(B. $B$7$?$,$C(B
+$B$F(B, ruby$B$rD>@\;H$C$?;~$H(B, $B<c430[$J$kF0:n$r9T$J$&>l9g$,$"$j$^$9(B.
+
+$B8=:_L@$i$+$K$J$C$F$$$kLdBjE@$r@bL@$7$^$9(B.
+
+== $B%m!<%+%kJQ?t$N@k8@(B
+
+ruby$B$G$O(B, $B0J2<$N%W%m%0%i%`$O%(%i!<$K$J$j$^$9(B.
+
+  eval "foo = 0"
+  foo
+  --
+  -:2: undefined local variable or method `foo' for #<Object:0x40283118> (NameError)
+  ---
+  NameError
+
+$B$H$3$m$,(B, irb$B$rMQ$$$k$H(B
+
+  >> eval "foo = 0"
+  => 0
+  >> foo
+  => 0
+
+$B$H$J$j(B, $B%(%i!<$r5/$3$7$^$;$s(B. $B$3$l$O(B, ruby$B$,:G=i$K%9%/%j%W%HA4BN$r%3%s(B
+$B%Q%$%k$7$F%m!<%+%kJQ?t$r7hDj$9$k$+$i$G$9(B. $B$=$l$KBP$7(B, irb$B$O<B9T2DG=$K(B
+$B$J$k(B($B<0$,JD$8$k(B)$B$H<+F0E*$KI>2A$7$F$$$k$+$i$G$9(B. $B>e5-$NNc$G$O(B, 
+
+  evel "foo = 0" 
+
+$B$r9T$J$C$?;~E@$GI>2A$r9T$J$$(B, $B$=$N;~E@$GJQ?t$,Dj5A$5$l$k$?$a(B, $B<!<0$G(B 
+$BJQ?t(Bfoo$B$ODj5A$5$l$F$$$k$+$i$G$9(B.
+
+$B$3$N$h$&$J(Bruby$B$H(Birb$B$NF0:n$N0c$$$r2r7h$7$?$$>l9g$O(B, begin...end$B$G3g$C$F(B
+$B%P%C%AE*$K<B9T$7$F2<$5$$(B:
+
+  >> begin
+  ?>   eval "foo = 0"
+  >>   foo
+  >> end
+  NameError: undefined local variable or method `foo' for #<Object:0x4013d0f0>
+  (irb):3
+  (irb_local_binding):1:in `eval'
+
+== $B%R%"%I%-%e%a%s%H(B
+
+$B8=:_$N$H$3$m%R%"%I%-%e%a%s%H$N<BAu$OIT40A4$G$9(B. 
+
+== $B%7%s%\%k(B
+
+$B%7%s%\%k$G$"$k$+$I$&$+$NH=CG$r4V0c$($k$3$H$,$"$j$^$9(B. $B6qBNE*$K$O<0$,40N;(B
+$B$7$F$$$k$N$K7QB39T$H8+$J$9$3$H$,$"$j$^$9(B.
+
+==end
+
+% Begin Emacs Environment
+% Local Variables:
+% mode: text
+% comment-column: 0
+% comment-start: "%"
+% comment-end: "\n"
+% End:
+%
+
diff --git a/lib/irb.rb b/lib/irb.rb
new file mode 100644
index 000000000..bfeb3f8be
--- /dev/null
+++ b/lib/irb.rb
@@ -0,0 +1,317 @@
+#
+#   irb.rb - irb main module
+#   	$Release Version: 0.7.3 $
+#   	$Revision$
+#   	$Date$
+#   	by Keiju ISHITSUKA(keiju@ishitsuka.com)
+#
+# --
+#
+#
+#
+require "e2mmap"
+
+require "irb/init"
+require "irb/context"
+require "irb/extend-command"
+require "irb/workspace"
+
+require "irb/ruby-lex"
+require "irb/input-method"
+require "irb/locale"
+
+STDOUT.sync = true
+
+module IRB
+  @RCS_ID='-$Id$-'
+
+  class Abort < Exception;end
+
+  #
+  @CONF = {}
+
+  def IRB.conf
+    @CONF
+  end
+
+  # IRB version method
+  def IRB.version
+    if v = @CONF[:VERSION] then return v end
+
+    require "irb/version"
+    rv = @RELEASE_VERSION.sub(/\.0/, "")
+    @CONF[:VERSION] = format("irb %s(%s)", rv, @LAST_UPDATE_DATE)
+  end
+
+  # initialize IRB and start TOP_LEVEL irb
+  # (JP: IRB$B=i4|2=$H%H%C%W%l%Y%k(Birb$B5/F0(B)
+  def IRB.start(ap_path = nil)
+    $0 = File::basename(ap_path, ".rb") if ap_path
+
+    IRB.initialize(ap_path)
+    IRB.parse_opts
+    IRB.load_modules
+
+    if @CONF[:SCRIPT]
+      irb = Irb.new(nil, @CONF[:SCRIPT])
+    else
+      irb = Irb.new
+    end
+
+    @CONF[:IRB_RC].call(irb.context) if @CONF[:IRB_RC]
+    @CONF[:MAIN_CONTEXT] = irb.context
+
+    trap("SIGINT") do
+      irb.signal_handle
+    end
+    
+    catch(:IRB_EXIT) do
+      irb.eval_input
+    end
+    print "\n"
+  end
+
+  def IRB.irb_exit(irb, ret)
+    throw :IRB_EXIT, ret
+  end
+
+  def IRB.irb_abort(irb, exception = Abort)
+    if defined? Thread
+      irb.context.thread.raise exception, "abort then interrupt!!"
+    else
+      raise exception, "abort then interrupt!!"
+    end
+  end
+
+  #
+  # irb interpriter main routine 
+  # (JP: irb$B%$%s%?%W%j%?K\BN(B)
+  #
+  class Irb
+    def initialize(workspace = nil, input_method = nil)
+      @context = Context.new(self, workspace, input_method)
+      @context.main.extend ExtendCommand
+      @signal_status = :IN_IRB
+
+      @scanner = RubyLex.new
+      @scanner.exception_on_syntax_error = false
+    end
+    attr_reader :context
+    attr_accessor :scanner
+
+    def eval_input
+      @scanner.set_input(@context.io) do
+	signal_status(:IN_INPUT) do
+	  unless l = @context.io.gets
+	    if @context.ignore_eof? and @context.io.readable_atfer_eof?
+	      l = "\n"
+	      if @context.verbose?
+		printf "Use \"exit\" to leave %s\n", @context.ap_name
+	      end
+	    end
+	  end
+	  l
+	end
+      end
+
+      @scanner.set_prompt do
+	|ltype, indent, continue, line_no|
+	if ltype
+	  f = @context.prompt_s
+	elsif continue
+	  f = @context.prompt_c
+	else @context.prompt_i
+	  f = @context.prompt_i
+	end
+	f = "" unless f
+	@context.io.prompt = p = prompt(f, ltype, indent, line_no)
+	if @context.auto_indent_mode
+	  unless ltype
+	    ind = prompt(@context.prompt_i, ltype, indent, line_no).size + 
+	      indent * 2 - p.size
+	    ind += 2 if continue
+	    @context.io.prompt = p + " " * ind if ind > 0
+	  end
+	end
+      end
+       
+      @scanner.each_top_level_statement do
+	|line, line_no|
+	signal_status(:IN_EVAL) do
+	  begin
+	    trace_in do
+	      @context._ = @context.workspace.evaluate(line, 
+						       @context.irb_path, 
+						       line_no)
+#	      @context._ = irb_eval(line, @context.bind, @context.irb_path, line_no)
+	    end
+
+	    if @context.inspect?
+	      printf @context.return_format, @context._.inspect
+	    else
+	      printf @context.return_format, @context._
+	    end
+	  rescue StandardError, ScriptError, Abort
+	    $! = RuntimeError.new("unknown exception raised") unless $!
+	    print $!.type, ": ", $!, "\n"
+	    if  $@[0] =~ /irb(2)?(\/.*|-.*|\.rb)?:/ && $!.type.to_s !~ /^IRB/
+	      irb_bug = true 
+	    else
+	      irb_bug = false
+	    end
+	    
+	    messages = []
+	    lasts = []
+	    levels = 0
+	    for m in $@
+	      m = @context.workspace.filter_backtrace(m) unless irb_bug
+	      if m
+		if messages.size < @context.back_trace_limit
+		  messages.push "\tfrom "+m
+		else
+		  lasts.push "\tfrom "+m
+		  if lasts.size > @context.back_trace_limit
+		    lasts.shift 
+		    levels += 1
+		  end
+		end
+	      end
+	    end
+	    print messages.join("\n"), "\n"
+	    unless lasts.empty?
+	      printf "... %d levels...\n", levels if levels > 0
+	      print lasts.join("\n")
+	    end
+	    print "Maybe IRB bug!!\n" if irb_bug
+	  end
+	end
+      end
+    end
+
+#     def irb_eval(line, bind, path, line_no)
+#       id, str = catch(:IRB_TOPLEVEL_EVAL){
+# 	return eval(line, bind, path, line_no)
+#       }
+#       case id
+#       when :EVAL_TOPLEVEL
+# 	eval(str, bind, "(irb_internal)", 1)
+#       when :EVAL_CONTEXT
+# 	@context.instance_eval(str)
+#       else
+# 	IRB.fail IllegalParameter
+#       end
+#     end
+
+    def signal_handle
+      unless @context.ignore_sigint?
+	print "\nabort!!\n" if @context.verbose?
+	exit
+      end
+
+      case @signal_status
+      when :IN_INPUT
+	print "^C\n"
+	@scanner.initialize_input
+	print @context.io.prompt
+      when :IN_EVAL
+	IRB.irb_abort(self)
+      when :IN_LOAD
+	IRB.irb_abort(self, LoadAbort)
+      when :IN_IRB
+	# ignore (JP: $B2?$b$7$J$$(B.)
+      else
+	# ignore (JP: $B$=$NB>$N>l9g$b2?$b$7$J$$(B.)
+      end
+    end
+
+    def signal_status(status)
+      return yield if @signal_status == :IN_LOAD
+
+      signal_status_back = @signal_status
+      @signal_status = status
+      begin
+	yield
+      ensure
+	@signal_status = signal_status_back
+      end
+    end
+
+    def trace_in
+      Tracer.on if @context.use_tracer?
+      begin
+	yield
+      ensure
+	Tracer.off if @context.use_tracer?
+      end
+    end
+
+    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
+
+    def inspect
+      ary = []
+      for iv in instance_variables
+	case iv
+	when "@signal_status"
+	  ary.push format("%s=:%s", iv, @signal_status.id2name)
+	when "@context"
+	  ary.push format("%s=%s", iv, eval(iv).__to_s__)
+	else
+	  ary.push format("%s=%s", iv, eval(iv))
+	end
+      end
+      format("#<%s: %s>", type, ary.join(", "))
+    end
+  end
+
+  # Singleton method
+  def @CONF.inspect
+    IRB.version unless self[:VERSION]
+
+    array = []
+    for k, v in sort{|a1, a2| a1[0].id2name <=> a2[0].id2name}
+      case k
+      when :MAIN_CONTEXT
+	next
+      when :PROMPT
+	s = v.collect{
+	  |kk, vv|
+	  ss = vv.collect{|kkk, vvv| ":#{kkk.id2name}=>#{vvv.inspect}"}
+	  format(":%s=>{%s}", kk.id2name, ss.join(", "))
+	}
+	array.push format("CONF[:%s]={%s}", k.id2name, s.join(", "))
+      else
+	array.push format("CONF[:%s]=%s", k.id2name, v.inspect)
+      end
+    end
+    array.join("\n")
+  end
+end
diff --git a/lib/irb/context.rb b/lib/irb/context.rb
new file mode 100644
index 000000000..8fa9de63a
--- /dev/null
+++ b/lib/irb/context.rb
@@ -0,0 +1,290 @@
+#
+#   irb/context.rb - irb context
+#   	$Release Version: 0.7.3$
+#   	$Revision$
+#   	$Date$
+#   	by Keiju ISHITSUKA(keiju@ishitsuka.com)
+#
+# --
+#
+#   
+#
+module IRB
+  class Context
+    #
+    # Arguments:
+    #   input_method: nil -- stdin or readline
+    #		      String -- File
+    #		      other -- using this as InputMethod
+    #
+    def initialize(irb, workspace = nil, input_method = nil)
+      @irb = irb
+      if workspace
+	@workspace = workspace
+      else
+	@workspace = WorkSpace.new unless workspace
+      end
+      @thread = Thread.current if defined? Thread
+      @irb_level = 0
+
+      # copy of default configuration
+      # (JP: $B%G%U%)%k%H%3%s%U%#%.%e%l!<%7%g%s$N%3%T!<(B)
+      @ap_name = IRB.conf[:AP_NAME]
+      @rc = IRB.conf[:RC]
+      @load_modules = IRB.conf[:LOAD_MODULES]
+
+      self.math_mode = IRB.conf[:MATH_MODE]
+      @use_readline = IRB.conf[:USE_READLINE]
+      @inspect_mode = IRB.conf[:INSPECT_MODE]
+      self.use_tracer = IRB.conf[:USE_TRACER]
+#      @use_loader = IRB.conf[:USE_LOADER]
+
+      self.prompt_mode = IRB.conf[:PROMPT_MODE]
+  
+      @ignore_sigint = IRB.conf[:IGNORE_SIGINT]
+      @ignore_eof = IRB.conf[:IGNORE_EOF]
+
+      @back_trace_limit = IRB.conf[:BACK_TRACE_LIMIT]
+      
+      debug_level = IRB.conf[:DEBUG_LEVEL]
+      @verbose = IRB.conf[:VERBOSE]
+
+      @tracer_initialized = false
+
+      if IRB.conf[:SINGLE_IRB] or !defined?(JobManager)
+	@irb_name = IRB.conf[:IRB_NAME]
+      else
+	@irb_name = "irb#"+IRB.JobManager.n_jobs.to_s
+      end
+      @irb_path = "(" + @irb_name + ")"
+
+      case input_method
+      when nil
+	if (use_readline.nil? && IRB.conf[:PROMPT_MODE] != :INF_RUBY ||
+	     use_readline?)
+	  @io = ReadlineInputMethod.new
+	else
+	  @io = StdioInputMethod.new
+	end
+      when String
+	@io = FileInputMethod.new(input_method)
+	@irb_name = File.basename(input_method)
+	@irb_path = input_method
+      else
+	@io = input_method
+      end
+    end
+
+    def main
+      @workspace.main
+    end
+
+    attr_accessor :workspace
+    attr_reader :thread
+    attr_accessor :io
+    
+    attr_reader :_
+    
+    attr_accessor :irb
+    attr_accessor :ap_name
+    attr_accessor :rc
+    attr_accessor :load_modules
+    attr_accessor :irb_name
+    attr_accessor :irb_path
+
+    attr_accessor :math_mode
+    attr_accessor :use_readline
+    attr_reader :inspect_mode
+    attr_reader :use_tracer
+#    attr :use_loader
+
+    attr_reader :debug_level
+    attr_accessor :verbose
+
+    attr_reader :prompt_mode
+    attr_accessor :prompt_i
+    attr_accessor :prompt_s
+    attr_accessor :prompt_c
+    attr_accessor :auto_indent_mode
+    attr_accessor :return_format
+
+    attr_accessor :ignore_sigint
+    attr_accessor :ignore_eof
+
+    attr_accessor :back_trace_limit
+
+#    alias use_loader? use_loader
+    alias use_tracer? use_tracer
+    alias use_readline? use_readline
+    alias rc? rc
+    alias math? math_mode
+    alias verbose? verbose
+    alias ignore_sigint? ignore_sigint
+    alias ignore_eof? ignore_eof
+
+    def _=(value)
+      @_ = value
+      @workspace.evaluate "_ = IRB.conf[:MAIN_CONTEXT]._"
+    end
+
+    def irb_name
+      if @irb_level == 0
+	@irb_name 
+      elsif @irb_name =~ /#[0-9]*$/
+	@irb_name + "." + @irb_level.to_s
+      else
+	@irb_name + "#0." + @irb_level.to_s
+      end
+    end
+
+    def prompt_mode=(mode)
+      @prompt_mode = mode
+      pconf = IRB.conf[:PROMPT][mode]
+      @prompt_i = pconf[:PROMPT_I]
+      @prompt_s = pconf[:PROMPT_S]
+      @prompt_c = pconf[:PROMPT_C]
+      @return_format = pconf[:RETURN]
+      if ai = pconf.include?(:AUTO_INDENT)
+	@auto_indent_mode = ai
+      else
+	@auto_indent_mode = IRB.conf[:AUTO_INDENT]
+      end
+    end
+    
+    def inspect?
+      @inspect_mode.nil? && !@math_mode or @inspect_mode
+    end
+
+    def file_input?
+      @io.type == FileInputMethod
+    end
+
+    def use_tracer=(opt)
+      if opt
+	IRB.initialize_tracer
+	unless @tracer_initialized
+	  Tracer.set_get_line_procs(@irb_path) {
+	    |line_no|
+	    @io.line(line_no)
+	  }
+	  @tracer_initialized = true
+	end
+      elsif !opt && @use_tracer
+	Tracer.off
+      end
+      @use_tracer=opt
+    end
+
+    def use_loader
+      IRB.conf[:USE_LOADER]
+    end
+
+    def use_loader=(opt)
+      IRB.conf[:USE_LOADER] = opt
+      if opt
+	IRB.initialize_loader
+      end
+      print "Switch to load/require#{unless use_loader; ' non';end} trace mode.\n" if verbose?
+      opt
+    end
+
+    def inspect_mode=(opt)
+      if opt
+	@inspect_mode = opt
+      else
+	@inspect_mode = !@inspect_mode
+      end
+      print "Switch to#{unless @inspect_mode; ' non';end} inspect mode.\n" if verbose?
+      @inspect_mode
+    end
+
+    def math_mode=(opt)
+      if @math_mode == true && opt == false
+	IRB.fail CantRetuenNormalMode
+	return
+      end
+
+      @math_mode = opt
+      if math_mode
+	IRB.initialize_mathn
+	main.instance_eval("include Math")
+	print "start math mode\n" if verbose?
+      end
+    end
+
+    def use_readline=(opt)
+      @use_readline = opt
+      print "use readline module\n" if @use_readline
+    end
+
+    def debug_level=(value)
+      @debug_level = value
+      RubyLex.debug_level = value
+      SLex.debug_level = value
+    end
+
+    def debug?
+      @debug_level > 0
+    end
+
+    def change_binding(*_main)
+      back = @workspace
+      @workspace = WorkSpace.new(*_main)
+      unless _main.empty?
+	begin
+	  main.extend ExtendCommand
+	rescue
+	  print "can't change binding to: ", main.inspect, "\n"
+	  @workspace = back
+	  return nil
+	end
+      end
+      @irb_level += 1
+      begin
+	catch(:SU_EXIT) do
+	  @irb.eval_input
+	end
+      ensure
+	@irb_level -= 1
+ 	@workspace = back
+      end
+    end
+    alias change_workspace change_binding
+
+
+    alias __exit__ exit
+    def exit(ret = 0)
+      if @irb_level == 0
+	IRB.irb_exit(@irb, ret)
+      else
+	throw :SU_EXIT, ret
+      end
+    end
+
+    NOPRINTING_IVARS = ["@_"]
+    NO_INSPECTING_IVARS = ["@irb", "@io"]
+    IDNAME_IVARS = ["@prompt_mode"]
+
+    alias __inspect__ inspect
+    def inspect
+      array = []
+      for ivar in instance_variables.sort{|e1, e2| e1 <=> e2}
+	name = ivar.sub(/^@(.*)$/){$1}
+	val = instance_eval(ivar)
+	case ivar
+	when *NOPRINTING_IVARS
+	  next
+	when *NO_INSPECTING_IVARS
+	  array.push format("conf.%s=%s", name, val.to_s)
+	when *IDNAME_IVARS
+	  array.push format("conf.%s=:%s", name, val.id2name)
+	else
+	  array.push format("conf.%s=%s", name, val.inspect)
+	end
+      end
+      array.join("\n")
+    end
+    alias __to_s__ to_s
+    alias to_s inspect
+  end
+end
diff --git a/lib/irb/extend-command.rb b/lib/irb/extend-command.rb
new file mode 100644
index 000000000..bc657520a
--- /dev/null
+++ b/lib/irb/extend-command.rb
@@ -0,0 +1,127 @@
+#
+#   irb/extend-command.rb - irb command extend
+#   	$Release Version: 0.7.3$
+#   	$Revision$
+#   	$Date$
+#   	by Keiju ISHITSUKA(keiju@ishitsuka.com)
+#
+# --
+#
+#   
+#
+module IRB
+  #
+  # IRB extended command
+  # (JP: IRB$B3HD%%3%^%s%I(B)
+  #
+  module ExtendCommand
+#    include Loader
+    
+    def irb_exit(ret = 0)
+      irb_context.exit(ret)
+    end
+    alias irb_quit irb_exit
+
+    def irb_fork(&block)
+      pid = send ExtendCommand.irb_original_method_name("fork")
+      unless pid 
+	class<<self
+	  alias_method :exit, ExtendCommand.irb_original_method_name('exit')
+	end
+	if iterator?
+	  begin
+	    yield
+	  ensure
+	    exit
+	  end
+	end
+      end
+      pid
+    end
+
+    def irb_change_binding(*main)
+      irb_context.change_binding(*main)
+    end
+    alias irb_change_workspace irb_change_binding
+
+    def irb_source(file)
+      irb_context.source(file)
+    end
+
+    def irb(*obj)
+      require "irb/multi-irb"
+      IRB.irb(nil, *obj)
+    end
+
+    def irb_context
+      IRB.conf[:MAIN_CONTEXT]
+    end
+
+    def irb_jobs
+      require "irb/multi-irb"
+      IRB.JobManager
+    end
+
+    def irb_fg(key)
+      require "irb/multi-irb"
+      IRB.JobManager.switch(key)
+    end
+
+    def irb_kill(*keys)
+      require "irb/multi-irb"
+      IRB.JobManager.kill(*keys)
+    end
+
+    # extend command functions
+    def ExtendCommand.extend_object(obj)
+      super
+      unless (class<<obj;ancestors;end).include?(ExtendCommand)
+	obj.install_aliases
+      end
+    end
+
+    OVERRIDE_NOTHING = 0
+    OVERRIDE_PRIVATE_ONLY = 0x01
+    OVERRIDE_ALL = 0x02
+
+    def install_aliases(override = OVERRIDE_NOTHING)
+
+      install_alias_method(:exit, :irb_exit, override | OVERRIDE_PRIVATE_ONLY)
+      install_alias_method(:quit, :irb_quit, override | OVERRIDE_PRIVATE_ONLY)
+      install_alias_method(:fork, :irb_fork, override | OVERRIDE_PRIVATE_ONLY)
+      install_alias_method(:kill, :irb_kill, override | OVERRIDE_PRIVATE_ONLY)
+
+      install_alias_method(:irb_cb, :irb_change_binding, override)
+      install_alias_method(:irb_ws, :irb_change_workspace, override)
+      install_alias_method(:source, :irb_source, override)
+      install_alias_method(:conf, :irb_context, override)
+      install_alias_method(:jobs, :irb_jobs, override)
+      install_alias_method(:fg, :irb_fg, override)
+    end
+
+    # override = {OVERRIDE_NOTHING, OVERRIDE_PRIVATE_ONLY, OVERRIDE_ALL}
+    def install_alias_method(to, from, override = OVERRIDE_NOTHING)
+      to = to.id2name unless to.kind_of?(String)
+      from = from.id2name unless from.kind_of?(String)
+
+      if override == OVERRIDE_ALL or
+	  (override == OVERRIDE_PRIVATE_ONLY) && !respond_to?(to) or
+	  (override == OVERRIDE_NOTHING) &&  !respond_to?(to, true)
+	target = self
+	(class<<self;self;end).instance_eval{
+	  if target.respond_to?(to, true) && 
+	      !target.respond_to?(ExtendCommand.irb_original_method_name(to), true)
+	    alias_method(ExtendCommand.irb_original_method_name(to), to) 
+	  end
+	  alias_method to, from
+	}
+      else
+	print "irb: warn: can't alias #{to} from #{from}.\n"
+      end
+    end
+
+    def self.irb_original_method_name(method_name)
+      "irb_" + method_name + "_org"
+    end
+  end
+end
diff --git a/lib/irb/help.rb b/lib/irb/help.rb
new file mode 100644
index 000000000..0821f68d1
--- /dev/null
+++ b/lib/irb/help.rb
@@ -0,0 +1,33 @@
+#
+#   irb/help.rb - print usase module
+#   	$Release Version: 0.7.3$
+#   	$Revision$
+#   	$Date$
+#   	by Keiju ISHITSUKA(keiju@ishitsuka.com)
+#
+# --
+#
+#   
+#
+
+module IRB
+  def IRB.print_usage
+    lc = IRB.conf[:LC_MESSAGES]
+    path = lc.find("irb/help-message")
+    space_line = false
+    File.foreach(path) do
+      |l|
+      if /^\s*$/ =~ l
+	lc.puts l unless space_line
+	space_line = true
+	next
+      end
+      space_line = false
+      
+      l.sub!(/#.*$/, "")
+      next if /^\s*$/ =~ l
+      lc.puts l
+    end
+  end
+end
+
diff --git a/lib/irb/init.rb b/lib/irb/init.rb
new file mode 100644
index 000000000..abfd9cdc2
--- /dev/null
+++ b/lib/irb/init.rb
@@ -0,0 +1,238 @@
+#
+#   irb/init.rb - irb initialize module
+#   	$Release Version: 0.7.3$
+#   	$Revision$
+#   	$Date$
+#   	by Keiju ISHITSUKA(keiju@ishitsuka.com)
+#
+# --
+#
+#   
+#
+
+module IRB
+
+  # initialize config
+  # (JP: config$B$N=i4|2=(B)
+  def IRB.initialize(ap_path)
+    IRB.init_config(ap_path)
+    IRB.init_error
+    IRB.run_config
+  end
+
+  # @CONF default setting
+  def IRB.init_config(ap_path)
+    # class instance variables
+    @TRACER_INITIALIZED = false
+    @MATHN_INITIALIZED = false
+
+    # default configurations
+    # (JP: $B%G%U%)%k%H%3%s%U%#%.%e%l!<%7%g%s(B)
+    unless ap_path and @CONF[:AP_NAME]
+      ap_path = File.join(File.dirname(File.dirname(__FILE__)), "irb.rb")
+    end
+    @CONF[:AP_NAME] = File::basename(ap_path, ".rb")
+
+    @CONF[:IRB_NAME] = "irb"
+    @CONF[:IRB_LIB_PATH] = File.dirname(__FILE__)
+
+    @CONF[:RC] = true
+    @CONF[:LOAD_MODULES] = []
+    @CONF[:IRB_RC] = nil
+
+    @CONF[:MATH_MODE] = false
+    @CONF[:USE_READLINE] = false unless defined?(ReadlineInputMethod)
+    @CONF[:INSPECT_MODE] = nil
+    @CONF[:USE_TRACER] = false
+    @CONF[:USE_LOADER] = false
+    @CONF[:IGNORE_SIGINT] = true
+    @CONF[:IGNORE_EOF] = false
+
+    @CONF[:BACK_TRACE_LIMIT] = 16
+
+    @CONF[:PROMPT] = {
+      :NULL => {
+	:PROMPT_I => nil,
+	:PROMPT_S => nil,
+	:PROMPT_C => nil,
+	:RETURN => "%s\n"
+      },
+      :DEFAULT => {
+	:PROMPT_I => "%N(%m):%03n:%i> ",
+	:PROMPT_S => "%N(%m):%03n:%i%l ",
+	:PROMPT_C => "%N(%m):%03n:%i* ",
+	:RETURN => "%s\n"
+      },
+      :SIMPLE => {
+	:PROMPT_I => ">> ",
+	:PROMPT_S => nil,
+	:PROMPT_C => "?> ",
+	:RETURN => "=> %s\n"
+      },
+      :INF_RUBY => {
+	:PROMPT_I => "%N(%m):%03n:%i> ",
+	:PROMPT_S => nil,
+	:PROMPT_C => nil,
+	:RETURN => "%s\n",
+	:AUTO_INDENT => true
+      },
+      :XMP => {
+	:PROMPT_I => nil,
+	:PROMPT_S => nil,
+	:PROMPT_C => nil,
+	:RETURN => "    ==>%s\n"
+      }
+    }
+
+    @CONF[:PROMPT_MODE] = :DEFAULT
+    @CONF[:AUTO_INDENT] = false
+
+    @CONF[:CONTEXT_MODE] = 3 # use binding in function on TOPLEVEL_BINDING
+    @CONF[:SINGLE_IRB] = false
+
+#    @CONF[:LC_MESSAGES] = "en"
+    @CONF[:LC_MESSAGES] = Locale.new
+    
+    @CONF[:DEBUG_LEVEL] = 1
+    @CONF[:VERBOSE] = true
+  end
+
+  def IRB.init_error
+    @CONF[:LC_MESSAGES].load("irb/error.rb")
+  end
+
+  # option analyzing
+  # (JP: $B%*%W%7%g%s2r@O(B)
+  def IRB.parse_opts
+    while opt = ARGV.shift
+      case opt
+      when "-f"
+	opt = ARGV.shift
+	@CONF[:RC] = false
+      when "-m"
+	@CONF[:MATH_MODE] = true
+      when "-d"
+	$DEBUG = true
+      when "-r"
+	opt = ARGV.shift
+	@CONF[:LOAD_MODULES].push opt if opt
+      when "--inspect"
+	@CONF[:INSPECT_MODE] = true
+      when "--noinspect"
+	@CONF[:INSPECT_MODE] = false
+      when "--readline"
+	@CONF[:USE_READLINE] = true
+      when "--noreadline"
+	@CONF[:USE_READLINE] = false
+
+      when "--prompt-mode", "--prompt"
+	prompt_mode = ARGV.shift.upcase.tr("-", "_").intern
+	IRB.fail(UndefinedPromptMode,
+		 prompt_mode.id2name) unless @CONF[:PROMPT][prompt_mode]
+	@CONF[:PROMPT_MODE] = prompt_mode
+      when "--noprompt"
+	@CONF[:PROMPT_MODE] = :NULL
+      when "--inf-ruby-mode"
+	@CONF[:PROMPT_MODE] = :INF_RUBY
+      when "--sample-book-mode", "--simple-prompt"
+	@CONF[:PROMPT_MODE] = :SIMPLE
+
+      when "--tracer"
+	@CONF[:USE_TRACER] = true
+      when "--back-trace-limit"
+	@CONF[:BACK_TRACE_LIMIT] = ARGV.shift.to_i
+      when "--context-mode"
+	@CONF[:CONTEXT_MODE] = ARGV.shift.to_i
+      when "--single-irb"
+	@CONF[:SINGLE_IRB] = true
+      when "--irb_debug"
+	@CONF[:DEBUG_LEVEL] = ARGV.shift.to_i
+      when "-v", "--version"
+	print IRB.version, "\n"
+	exit 0
+      when "-h", "--help"
+	require "irb/help"
+	IRB.print_usage
+	exit 0
+      when /^-/
+	IRB.fail UnrecognizedSwitch, opt
+      else
+	@CONF[:USE_READLINE] = false
+	@CONF[:SCRIPT] = opt
+	$0 = opt
+	break
+      end
+    end
+  end
+
+  # running config
+  def IRB.run_config
+    if @CONF[:RC]
+      rcs = []
+      rcs.push File.expand_path("~/.irbrc") if ENV.key?("HOME")
+      rcs.push ".irbrc"
+      rcs.push "irb.rc"
+      rcs.push "_irbrc"
+      rcs.push "$irbrc"
+      catch(:EXIT) do
+	for rc in rcs
+	  begin
+	    load rc
+	    throw :EXIT
+	  rescue LoadError, Errno::ENOENT
+	  rescue
+	    print "load error: #{rc}\n"
+	    print $!.type, ": ", $!, "\n"
+	    for err in $@[0, $@.size - 2]
+	      print "\t", err, "\n"
+	    end
+	    throw :EXIT
+	  end
+	end
+      end
+    end
+  end
+
+  # loading modules
+  def IRB.load_modules
+    for m in @CONF[:LOAD_MODULES]
+      begin
+	require m
+      rescue
+	print $@[0], ":", $!.type, ": ", $!, "\n"
+      end
+    end
+  end
+
+  # initialize tracing function
+  # (JP: $B%H%l!<%5=i4|@_Dj(B)
+  def IRB.initialize_tracer
+    unless @TRACER_INITIALIZED
+      require("tracer")
+      Tracer.verbose = false
+      Tracer.add_filter {
+	|event, file, line, id, binding|
+	File::dirname(file) != @CONF[:IRB_LIB_PATH]
+      }
+      @TRACER_INITIALIZED = true
+    end
+  end
+
+  # initialize mathn function
+  # (JP: mathn$B=i4|@_Dj(B)
+  def IRB.initialize_mathn
+    unless @MATHN_INITIALIZED
+      require "mathn"
+    @MATHN_INITIALIZED = true
+    end
+  end
+
+  # initialize loader function
+  # (JP: loader$B=i4|@_Dj(B)
+  def IRB.initialize_loader
+    unless @LOADER_INITIALIZED
+      require "irb/loader"
+      @LOADER_INITIALIZED = true
+    end
+  end
+end
diff --git a/lib/irb/lc/error.rb b/lib/irb/lc/error.rb
new file mode 100644
index 000000000..15f3cab83
--- /dev/null
+++ b/lib/irb/lc/error.rb
@@ -0,0 +1,30 @@
+#
+#   irb/lc/error.rb - 
+#   	$Release Version: 0.7.3$
+#   	$Revision$
+#   	$Date$
+#   	by Keiju ISHITSUKA(keiju@ishitsuka.com)
+#
+# --
+#
+#   
+#
+require "e2mmap"
+
+module IRB
+
+  # exceptions (JP: $BNc30Dj5A(B)
+  extend Exception2MessageMapper
+  def_exception :UnrecognizedSwitch, "Unrecognized switch: %s"
+  def_exception :NotImplementError, "Need to define `%s'"
+  def_exception :CantRetuenNormalMode, "Can't return normal mode."
+  def_exception :IllegalParameter, "Illegal parameter(%s)."
+  def_exception :IrbAlreadyDead, "Irb is already dead."
+  def_exception :IrbSwitchToCurrentThread, "Change to current thread."
+  def_exception :NoSuchJob, "No such job(%s)."
+  def_exception :CanNotGoMultiIrbMode, "Can't go multi irb mode."
+  def_exception :CanNotChangeBinding, "Can't change binding to (%s)."
+  def_exception :UndefinedPromptMode, "Undefined prompt mode(%s)."
+
+end
+
diff --git a/lib/irb/lc/help-message b/lib/irb/lc/help-message
new file mode 100644
index 000000000..8a3d63803
--- /dev/null
+++ b/lib/irb/lc/help-message
@@ -0,0 +1,34 @@
+#
+#   irb/lc/help-message.rb - 
+#   	$Release Version: 0.7.3$
+#   	$Revision$
+#   	$Date$
+#   	by Keiju ISHITSUKA(keiju@ishitsuka.com)
+#
+# --
+#
+#   
+#
+Usage:  irb.rb [options] [programfile] [arguments]
+  -f		    suppress read ~/.irbrc 
+  -m		    bc mode (load mathn, fraction or matrix are available)
+  -d                set $DEBUG  to true (same as `ruby -d')
+  -r load-module    same as `ruby -r'
+  --inspect	    uses `inspect' for output (the default except bc mode)
+  --noinspect	    doesn't uses inspect for output
+  --readline	    uses Readline extension module
+  --noreadline	    doesn't use Readline extension module
+  --prompt prompt-mode
+  --prompt-mode prompt-mode
+		    switches prompt mode. Pre-defined prompt modes are
+		    `defalut', `simple', `xmp' and `inf-ruby'
+  --inf-ruby-mode   uses prompt appreciate for inf-ruby-mode on emacs. 
+		    Suppresses --readline. 
+  --simple-prompt   simple prompt mode
+  --noprompt	    no prompt
+  --tracer	    display trace for each execution of commands.
+  --back-trace-limit n
+		    displayes backtrace top n and tail n. The default
+		    value is 16. 
+  --irb_debug n	    sets internal debug level to n (It shouldn't be used)
+  -v, --version	    prints the version of irb
diff --git a/lib/irb/lc/ja/error.rb b/lib/irb/lc/ja/error.rb
new file mode 100644
index 000000000..1fa3ae328
--- /dev/null
+++ b/lib/irb/lc/ja/error.rb
@@ -0,0 +1,29 @@
+#
+#   irb/lc/ja/error.rb - 
+#   	$Release Version: 0.7.3$
+#   	$Revision$
+#   	$Date$
+#   	by Keiju ISHITSUKA(keiju@ishitsuka.com)
+#
+# --
+#
+#   
+#
+require "e2mmap"
+
+module IRB
+  # exceptions (JP: $BNc30Dj5A(B)
+  extend Exception2MessageMapper
+  def_exception :UnrecognizedSwitch, '$B%9%$%C%A(B(%s)$B$,J,$j$^$;$s(B'
+  def_exception :NotImplementError, '`%s\'$B$NDj5A$,I,MW$G$9(B'
+  def_exception :CantRetuenNormalMode, 'Normal$B%b!<%I$KLa$l$^$;$s(B.'
+  def_exception :IllegalParameter, '$B%Q%i%a!<%?(B(%s)$B$,4V0c$C$F$$$^$9(B.'
+  def_exception :IrbAlreadyDead, 'Irb$B$O4{$K;`$s$G$$$^$9(B.'
+  def_exception :IrbSwitchToCurrentThread, 'Change to current thread.'
+  def_exception :NoSuchJob, '$B$=$N$h$&$J%8%g%V(B(%s)$B$O$"$j$^$;$s(B.'
+  def_exception :CanNotGoMultiIrbMode, 'multi-irb mode$B$K0\$l$^$;$s(B.'
+  def_exception :CanNotChangeBinding, '$B%P%$%s%G%#%s%0(B(%s)$B$KJQ99$G$-$^$;$s(B.'
+  def_exception :UndefinedPromptMode, '$B%W%m%s%W%H%b!<%I(B(%s)$B$ODj5A$5$l$F$$$^$;$s(B.'
+end
+
+
diff --git a/lib/irb/lc/ja/help-message b/lib/irb/lc/ja/help-message
new file mode 100644
index 000000000..59f5c7a72
--- /dev/null
+++ b/lib/irb/lc/ja/help-message
@@ -0,0 +1,35 @@
+#
+#   irb/lc/ja/help-message.rb - 
+#   	$Release Version: 0.7.3$
+#   	$Revision$
+#   	$Date$
+#   	by Keiju ISHITSUKA(keiju@ishitsuka.com)
+#
+# --
+#
+#   
+#
+Usage:  irb.rb [options] [programfile] [arguments]
+  -f		    ~/.irbrc $B$rFI$_9~$^$J$$(B.
+  -m		    bc$B%b!<%I(B($BJ,?t(B, $B9TNs$N7W;;$,$G$-$k(B)
+  -d                $DEBUG $B$r(Btrue$B$K$9$k(B(ruby -d $B$HF1$8(B)
+  -r load-module    ruby -r $B$HF1$8(B.
+  --inspect	    $B7k2L=PNO$K(Binspect$B$rMQ$$$k(B(bc$B%b!<%I0J30$O%G%U%)%k%H(B). 
+  --noinspect	    $B7k2L=PNO$K(Binspect$B$rMQ$$$J$$(B.
+  --readline	    readline$B%i%$%V%i%j$rMxMQ$9$k(B.
+  --noreadline	    readline$B%i%$%V%i%j$rMxMQ$7$J$$(B. 
+  --prompt prompt-mode/--prompt-mode prompt-mode
+		    $B%W%m%s%W%H%b!<%I$r@ZBX$($^$9(B. $B8=:_Dj5A$5$l$F$$$k%W(B
+		    $B%m%s%W%H%b!<%I$O(B, defalut, simple, xmp, inf-ruby$B$,(B
+		    $BMQ0U$5$l$F$$$^$9(B. 
+  --inf-ruby-mode   emacs$B$N(Binf-ruby-mode$BMQ$N%W%m%s%W%HI=<($r9T$J$&(B. $BFC(B
+		    $B$K;XDj$,$J$$8B$j(B, readline$B%i%$%V%i%j$O;H$o$J$/$J$k(B.
+  --simple-prompt   $BHs>o$K%7%s%W%k$J%W%m%s%W%H$rMQ$$$k%b!<%I$G$9(B.
+  --noprompt	    $B%W%m%s%W%HI=<($r9T$J$o$J$$(B.
+  --tracer	    $B%3%^%s%I<B9T;~$K%H%l!<%9$r9T$J$&(B.
+  --back-trace-limit n
+		    $B%P%C%/%H%l!<%9I=<($r%P%C%/%H%l!<%9$NF,$+$i(B n, $B8e$m(B
+		    $B$+$i(Bn$B$@$19T$J$&(B. $B%G%U%)%k%H$O(B16 
+  --irb_debug n	    irb$B$N%G%P%C%0%G%P%C%0%l%Y%k$r(Bn$B$K@_Dj$9$k(B($BMxMQ$7$J(B
+		    $B$$J}$,L5Fq$G$7$g$&(B).
+  -v, --version	    irb$B$N%P!<%8%g%s$rI=<($9$k(B
diff --git a/lib/irb/locale.rb b/lib/irb/locale.rb
new file mode 100644
index 000000000..ef92ea137
--- /dev/null
+++ b/lib/irb/locale.rb
@@ -0,0 +1,187 @@
+#
+#   irb/locale.rb - internationalization module
+#   	$Release Version: 0.7.3$
+#   	$Revision$
+#   	$Date$
+#   	by Keiju ISHITSUKA(keiju@ishitsuka.com)
+#
+# --
+#
+#   
+#
+
+require "kconv"
+
+module IRB
+  class Locale
+    @RCS_ID='-$Id$-'
+
+    JPDefaultLocale = "ja"
+    LOCALE_DIR = "/lc/"
+
+    LC2KCONV = {
+#      "ja" => Kconv::JIS,
+#      "ja_JP" => Kconv::JIS,
+      "ja_JP.ujis" => Kconv::EUC,
+      "ja_JP.euc" => Kconv::EUC,
+      "ja_JP.eucJP" => Kconv::EUC,
+      "ja_JP.sjis" => Kconv::SJIS,
+      "ja_JP.SJIS" => Kconv::SJIS,
+    }
+
+    def initialize(locale = nil)
+      @lang = locale || ENV["IRB_LANG"] || ENV["LC_MESSAGES"] || ENV["LC_ALL"] || ENV["LANG"]
+      @lang = "C" unless @lang
+    end
+
+    attr_reader :lang
+
+    def String(mes)
+      mes = super(mes)
+      case @lang
+      when /^ja/
+	mes = Kconv::kconv(mes, LC2KCONV[@lang])
+      else
+	mes
+      end
+      mes
+    end
+
+    def format(*opts)
+      String(super(*opts))
+    end
+
+    def gets(*rs)
+      String(super(*rs))
+    end
+
+    def readline(*rs)
+      String(super(*rs))
+    end
+
+    def print(*opts)
+      ary = opts.collect{|opt| String(opt)}
+      super *ary
+    end
+
+    def printf(*opts)
+      s = format(*opts)
+      print s
+    end
+
+    def puts(*opts)
+      ary = opts.collect{|opt| String(opts)}
+      super *ary
+    end
+
+    autoload :Tempfile, "tempfile"
+
+    def require(file, priv = nil)
+      rex = Regexp.new("lc/#{Regexp.quote(file)}\.(so|o|sl|rb)?")
+      return false if $".find{|f| f =~ rex}
+
+      case file
+      when /\.rb$/
+	begin
+	  load(file, priv)
+	  $".push file
+	  return true
+	rescue LoadError
+	end
+      when /\.(so|o|sl)$/
+	return super
+      end
+
+      begin
+	load(f = file + ".rb")
+	$".push f  #"
+	return true
+      rescue LoadError
+	return ruby_require(file)
+      end
+    end
+
+    alias toplevel_load load
+    
+    def load(file, priv=nil)
+      dir = File.dirname(file)
+      dir = "" if dir == "."
+      base = File.basename(file)
+
+      if /^ja(_JP)?$/ =~ @lang
+ 	back, @lang = @lang, "C"
+      end
+      begin
+	if dir[0] == ?/ #/
+	  lc_path = search_file(dir, base)
+	  return real_load(lc_path, priv) if lc_path
+	end
+	
+	for path in $:
+	  lc_path = search_file(path + "/" + dir, base)
+	  return real_load(lc_path, priv) if lc_path
+	end
+      ensure
+	@lang = back if back
+      end
+      raise LoadError, "No such file to load -- #{file}"
+    end 
+
+    def real_load(path, priv)
+      tmp_base = path.tr("./:", "___")
+      lc_file = Tempfile.new(tmp_base)
+      File.foreach(path) do |line|
+	line = self.String(line)
+	lc_file.print(line)
+      end
+      lc_file.close
+      toplevel_load lc_file.path, priv
+    end
+    private :real_load
+
+    def find(file , paths = $:)
+      dir = File.dirname(file)
+      dir = "" if dir == "."
+      base = File.basename(file)
+      if dir[0] == ?/ #/
+	  return lc_path = search_file(dir, base)
+      else
+	for path in $:
+	  if lc_path = search_file(path + "/" + dir, base)
+	    return lc_path
+	  end
+	end
+      end
+      nil
+    end
+
+    def search_file(path, file)
+      if File.exists?(p1 = path + lc_path(file, "C"))
+	if File.exists?(p2 = path + lc_path(file))
+	  return p2
+	else
+	end
+	return p1
+      else
+      end
+      nil
+    end
+    private :search_file
+
+    def lc_path(file = "", lc = @lang)
+      case lc
+      when "C"
+	LOCALE_DIR + file
+      when /^ja/
+	LOCALE_DIR + "ja/" + file
+      else
+	LOCALE_DIR + @lang + "/" + file
+      end
+    end
+    private :lc_path
+  end
+end
+
+
+
+
diff --git a/lib/irb/workspace.rb b/lib/irb/workspace.rb
new file mode 100644
index 000000000..3550a758d
--- /dev/null
+++ b/lib/irb/workspace.rb
@@ -0,0 +1,106 @@
+#
+#   irb/workspace-binding.rb - 
+#   	$Release Version: 0.7.3$
+#   	$Revision$
+#   	$Date$
+#   	by Keiju ISHITSUKA(keiju@ishitsuka.com)
+#
+# --
+#
+#   
+#
+module IRB
+  class WorkSpace
+    # create new workspace. 
+    # (JP: $B?7$?$J(Bworkspace$B$r:n$k(B. main$B$r(Bself$B$H$9$k(B. $B>JN,$7$?$i(B, 
+    #      TOPLEVEL_BINDING$B$N(Bmain$B$r$=$N$^$^;H$&(B. )
+    def initialize(*main)
+      if IRB.conf[:SINGLE_IRB]
+	@binding = TOPLEVEL_BINDING
+      else
+	case IRB.conf[:CONTEXT_MODE]
+	when 0	# binding in proc on TOPLEVEL_BINDING
+	  @binding = eval("proc{binding}.call",
+		      TOPLEVEL_BINDING, 
+		      __FILE__,
+		      __LINE__)
+	when 1	# binding in loaded file
+	  require "tempfile"
+	  f = Tempfile.open("irb-binding")
+	  f.print <<EOF
+	  $binding = binding
+EOF
+	  f.close
+	  load f.path
+	  @binding = $binding
+
+	when 2	# binding in loaded file(thread use)
+	  unless defined? BINDING_QUEUE
+	    require "thread"
+	    
+	    IRB.const_set("BINDING_QUEUE", SizedQueue.new(1))
+	    Thread.abort_on_exception = true
+	    Thread.start do
+	      eval "require \"irb/ws-for-case-2\"", TOPLEVEL_BINDING, __FILE__, __LINE__
+	    end
+	    Thread.pass
+	  end
+	  @binding = BINDING_QUEUE.pop
+
+	when 3	# binging in function on TOPLEVEL_BINDING(default)
+	  @binding = eval("def irb_binding; binding; end; irb_binding",
+		      TOPLEVEL_BINDING, 
+		      __FILE__,
+		      __LINE__ - 3)
+	end
+      end
+      if main.empty?
+	@main = eval "self", @binding
+      else
+	@main = main[0]
+	IRB.conf[:__MAIN__] = @main
+	case @main
+	when Module
+	  @binding = eval("IRB.conf[:__MAIN__].module_eval('binding', __FILE__, __LINE__)", @binding, __FILE__, __LINE__)
+	else
+	  begin 
+	    @binding = eval("IRB.conf[:__MAIN__].instance_eval('binding', __FILE__, __LINE__)", @binding, __FILE__, __LINE__)
+	  rescue TypeError
+	    IRB.fail CanNotChangeBinding, @main.inspect
+	  end
+	end
+      end
+      eval("_=nil", @binding)
+    end
+
+    attr_reader :binding
+    attr_reader :main
+
+    def evaluate(statements, file = __FILE__, line = __LINE__)
+      eval statements, @binding, file, line
+    end
+
+    # error message manupilator
+    def filter_backtrace(bt)
+      case IRB.conf[:CONTEXT_MODE]
+      when 0
+	return nil if bt =~ /\(irb_local_binding\)/
+      when 1
+	if(bt =~ %r!/tmp/irb-binding! or
+	   bt =~ %r!irb/.*\.rb! or
+	   bt =~ /irb\.rb/)
+	  return nil
+	end
+      when 2
+	return nil if bt =~ /irb\/.*\.rb/
+      when 3
+	return nil if bt =~ /irb\/.*\.rb/
+	bt.sub!(/:\s*in `irb_binding'/){""} 
+      end
+      bt
+    end
+
+    def IRB.delete_caller
+    end
+  end
+end
diff --git a/lib/irb/ws-for-case-2.rb b/lib/irb/ws-for-case-2.rb
new file mode 100644
index 000000000..8cfa87ae3
--- /dev/null
+++ b/lib/irb/ws-for-case-2.rb
@@ -0,0 +1,15 @@
+#
+#   irb/ws-for-case-2.rb - 
+#   	$Release Version: 0.7.3$
+#   	$Revision$
+#   	$Date$
+#   	by Keiju ISHITSUKA(keiju@ishitsuka.com)
+#
+# --
+#
+#   
+#
+
+while true
+  IRB::BINDING_QUEUE.push b = binding
+end