ADDED   tcl053.js
Index: tcl053.js
==================================================================
--- tcl053.js
+++ tcl053.js
@@ -0,0 +1,1300 @@
+/* =================================================== -*- C++ -*-
+ * tcl.js "A Tcl implementation in Javascript"
+ *
+ * Released under the same terms as Tcl itself.
+ * (BSD license found at <http://www.tcl.tk/software/tcltk/license.html>)
+ *
+ * Based on Picol by Salvatore Sanfilippo (<http://antirez.com/page/picol>)
+ * (c) Stéphane Arnold 2007
+ * Richard Suchenwirth 2007, 2013: cleanup, additions
+ * vim: syntax=javascript autoindent softtabwidth=4
+ */
+_step = 0; // set to 1 for debugging
+var fs = require('fs');
+puts = console.log;
+
+function TclInterp () {
+    this.patchlevel = "0.5.3";
+    this.callframe  = [{}];
+    this.level      = 0;
+    this.levelcall  = [];
+    this.commands   = {};
+    this.procs      = [];
+    this.script     = "";
+    this.OK  = 0;
+    this.RET = 1;
+    this.BRK = 2;
+    this.CNT = 3;
+    this.getVar = function(name) {
+        var nm = name.toString();
+        if (nm.match("^::env[(]")) nm=nm.substr(2);
+        if (nm.match("^env[(]")) {
+            var key = nm.substr(4,nm.length-5);
+            var val = process.env[key];
+        } else if (nm.match("^::")) {
+            var val = this.callframe[0][nm.substr(2)]; // global
+        } else {
+            var val = this.callframe[this.level][name];
+        }
+        if (val == null) throw 'can\'t read "'+name+'": no such variable';
+        return val;
+    }
+    this.setVar = function(name, val) {
+        var nm = name.toString();
+        if (nm.match("^::")) {
+            this.callframe[0][nm.substr(2)] = val;
+        } else {this.callframe[this.level][name] = val;}
+        return val;
+    }
+    this.setVar("argc",  process.argv.length-2);
+    this.setVar("argv0", process.argv[1]);
+    this.setVar("argv",  process.argv.slice(2));
+    this.setVar("errorInfo", "");
+
+    this.incrLevel = function() {
+        this.callframe[++this.level] = {};
+        return this.level;
+    }
+    this.decrLevel = function() {
+        this.callframe[this.level] = null;
+        this.level--;
+        if (this.level<0) throw "Exit application";
+        this.result = null;
+    }
+    this.getCommand = function(name) {
+        try {
+            return this.commands[name];
+        } catch (e) {throw "No such command '"+name+"'";}
+    }
+    this.registerCommand = function(name, func, privdata) {
+        if (func == null) throw "No such function: "+name;
+        this.commands[name] = new TclCommand(func, privdata);
+    }
+    this.registerSubCommand = function(name, subcmd, func, privdata) {
+      if (func == null) throw "No such subcommand: "+ name +" " + subcmd;
+      var path = name.split(" ");
+      var ens;
+      name = path.shift();
+      var cmd = this.commands[name];
+      if (cmd == null) {
+	ens = {};
+	// ens["subcommands"]  = new TclCommand(Tcl.InfoSubcommands, null);
+	this.commands[name] = new TclCommand(Tcl.EnsembleCommand, null, ens);
+      }
+      ens = this.commands[name].ensemble;
+      if (ens == null) throw "Not an ensemble command: '"+name+"'";
+      // walks deeply into the subcommands tree
+      while (path.length > 0) {
+	name = path.shift();
+	cmd  = ens[name];
+	if (cmd == null) {
+	  cmd = new TclCommand(Tcl.EnsembleCommand, null, {});
+	  ens[name] = cmd;
+	  ens = cmd.ensemble;
+	  // ens["subcommands"] = new TclCommand(Tcl.InfoSubcommands, null);
+	}
+      }
+      ens[subcmd] = new TclCommand(func, privdata);
+    }
+    this.eval = function (code) {
+      try {
+	return this.eval2(code);
+      } catch (e) {
+	var msg = code.substr(0,128);
+	if(msg.length >= 125) msg += "...";
+	puts(e);
+	var msg = e+'\n        while executing\n"'+msg+'"';
+	for(var i = this.level; i > 0; i--)
+	  msg += '\n        invoked from within\n"'+this.levelcall[i]+'"'
+	this.setVar("::errorInfo", msg);
+      }
+    }
+    this.eval2 = function(code) {
+      this.code  = this.OK;
+      var parser = new TclParser(code);
+      var args   = [];
+      var first  = true;
+      var text, prevtype, result;
+      result     = "";
+      while (true) {
+	prevtype = parser.type;
+	try {
+	  parser.getToken();
+	} catch (e) {break;}
+	if (parser.type == (parser.EOF)) break;
+	text = parser.getText();
+	if (parser.type == (parser.VAR)) {
+	  text = this.getVar(text);
+	} else if (parser.type == (parser.CMD)) {
+	  try {
+	    text = this.eval2(text);
+	  } catch (e) {throw (e + "\nwhile parsing \"" + text + "\"");}
+	} else if (parser.type == (parser.ESC)) {
+	  // escape handling missing!
+	} else if (parser.type == (parser.SEP)) {
+	  prevtype = parser.type;
+	  continue;
+	}
+	text = this.objectify(text);
+	if (parser.type ==parser.EOL || parser.type == parser.EOF) {
+	  prevtype = parser.type;
+	  if (args.length > 0) {
+	    try {
+	      result = this.call(args);
+	    } catch(e) {
+	      if(e.toString().match("Cannot call method")) 
+		throw 'invalid command name "'+args[0].toString()+'"';
+	      throw e;
+	    }
+	    if (this.code != this.OK) return this.objectify(result);
+	  }
+	  args = [];
+	  continue;
+	}
+	if (prevtype == parser.SEP || prevtype == parser.EOL) {
+	  args.push(text);
+	} else {
+	  args[args.length-1] = args[args.length-1].toString() + text.toString();
+	}
+      }
+      if (args.length > 0) result = this.call(args);
+      return this.objectify(result);
+    }
+    //---------------------------------- Commands in alphabetical order
+    this.registerCommand("append", function (interp, args) {
+        this.arity(args, 2, Infinity);
+        var vname = args[1].toString();
+	try {var str = interp.getVar(vname);} catch(e) {var str = "";}
+	for (var i = 2; i < args.length; i++) str += args[i].toString();
+        interp.setVar(vname, str);
+        return str;
+      });
+    this.registerCommand("break", function (interp, args) {
+        interp.code = interp.BRK;
+        return;
+      });
+    this.registerCommand("cd", function (interp, args) {
+	this.arity(args, 1, 2);
+	var dir = process.env.HOME;
+	if (args.length == 2) dir = args[1].toString();
+	process.chdir(dir);
+	return;
+      });
+    this.registerCommand("continue", function (interp, args) {
+        interp.code = interp.CNT;
+        return;
+      });
+    this.registerSubCommand("clock", "format", function (interp, args) {
+        var now = new Date();
+        now.setTime(args[1]);
+        return now.toString();
+      });
+    this.registerSubCommand("clock", "milliseconds", function (interp, args) {
+	var t = new Date();
+	return t.valueOf();
+      });
+    this.registerSubCommand("clock", "scan", function (interp, args) {
+        return Date.parse(args[1]);
+      });
+    this.registerSubCommand("clock", "seconds", function (interp, args) {
+	return Math.floor((new Date()).valueOf()/1000);
+      });
+    
+    this.registerSubCommand("dict", "create", function (interp, args) {
+	if(args.length % 2 == 0) 
+	  throw 'wrong # args: should be "dict create ?key value ...?"';
+	return new TclObject(args.slice(1));
+      });
+    this.registerSubCommand("dict", "get", function (interp, args) {
+	if(args.length < 2) 
+	  throw 'wrong # args: should be "dict get ?key ...?"';
+	var dict = args[1].toList();
+	var key  = args[2].toString();
+	for (var i=0;i < dict.length;i+=2) {
+	  if(dict[i].toString() == key) return dict[i+1];
+	}
+	throw 'key "'+key+'" not known in dictionary';
+      });
+    this.registerSubCommand("dict", "set", function (interp, args) {
+	this.arity(args, 4);
+	var name  = args[1];
+	var dict  = interp.getVar(name);
+	var key   = args[2].toString();
+	var val   = args[3].toString();
+	var found = false;
+	var list  = dict.toList();
+	for (var i=0;i < list.length;i+=2) {
+	  if(list[i].toString() == key) {
+	    list[i+1] = val;
+	    found = true;
+	    break;
+	  }
+	}
+	if (!found) {
+	  list.push(interp.objectify(key)); 
+	  list.push(interp.objectify(val));
+	} 
+	interp.setVar(name, dict);
+	return dict;
+      });
+    /*
+      if(typeof(jQuery) != 'undefined') {
+      this.registerCommand("dom", function (interp, args) {
+      var selector = args[1].toString();
+      var fn = args[2].toString();
+      args = args.slice(3);
+      for (var i in args) args[i] = args[i].toString();
+      var q = $(selector);
+      q[fn].apply(q,args);
+      return "dom    " + selector;
+      });
+      }*/
+    this.registerCommand("eval",function (interp, args) {
+        this.arity(args, 2,Infinity);
+        for (var i = 1; i < args.length; i++) args[i] = args[i].toString();
+        if (args.length == 2) var code = args[1];
+        else                  var code = args.slice(1).join(" ");
+        return interp.eval(code);
+      });
+    /*
+      this.registerCommand("exec",function (interp, args) {
+      this.arity(args, 2, Infinity);
+      var exec = require('child_process').exec,
+      child;
+      puts("exec "+args.slice(1).join(" "));
+      child = exec(args.slice(1).join(" "),
+      function (error, stdout, stderr) {
+      var res = stdout.toString();
+      //console.log('stdout: ' + stdout.toString());
+      if (error !== null) {
+      throw('exec error: ' + error);
+      } 
+      return res;
+      });
+      return this.execres;
+      });
+    */
+    this.registerCommand("exit",function (interp, args) {
+	this.arity(args, 1,2);
+	var rc = 0;
+	if (args.length == 2) rc = args[1];
+	process.exit(rc);
+      });
+    acos = Math.acos;
+    exp  = Math.exp;
+    sqrt = Math.sqrt; // "publish" other Math.* functions as needed
+
+    this.registerCommand("expr", function (interp, args) {
+	var expression = args.slice(1).join(" ");
+	return interp.expr(interp, expression);
+      });
+    this.expr = function ($interp, $expression) { // also used in for, if, while
+      try {
+	var $mx = $expression.match(/(\[.*\])/g);
+	for ($i in $mx)
+	  puts("have to deal with "+$mx[i].toString());
+      } catch(e) {puts(i+". exception: "+e);}
+      $mx = $expression.match(/(\$[A-Za-z0-9_:]+)/g);
+      for ($i in $mx)
+	eval("var "+$mx[$i]+" = "+$interp.getVar($mx[$i].slice(1)));
+      var res = eval($expression);
+      if(res == false) res = 0; else if(res == true) res = 1;
+      return res;
+    };
+    this.registerSubCommand("file", "dirname", function (interp, args) {
+        this.arity(args, 2);
+	var path = args[1].toString().split("/");
+	path.pop();
+	return path.join("/");
+      });
+    this.registerCommand("for", function (interp, args) {
+        this.arity(args, 5);
+        interp.eval(args[1].toString());
+        if(interp.code != interp.OK) return;
+        var cond = args[2].toString();
+        var step = args[3].toString();
+        var body = args[4].toString();
+        interp.inLoop = true;
+        interp.code = interp.OK;
+        while (true) {
+            test = interp.objectify(interp.expr(interp, cond));
+            if (!test.toBoolean()) break;
+            interp.eval(body);
+            var ic = interp.code; // tested after step command
+            interp.eval(step);
+            if(ic == interp.BRK) break;
+            if(ic == interp.CNT) continue;
+        }
+        interp.inLoop = false;
+        if(interp.code == interp.BRK || interp.code == interp.CNT)
+            interp.code = interp.OK;
+        return "";
+    });
+    this.registerCommand("foreach", function (interp, args) {
+        this.arity(args, 4);
+        var list = args[2].toList();
+        var body = args[3].toString();
+        var res    = "";
+        interp.inLoop = true;
+        interp.code = interp.OK;
+        for(i in list) {
+             interp.setVar(args[1],interp.objectify(list[i]));
+             interp.eval(body);
+             if(interp.code == interp.BRK) break;
+             if(interp.code == interp.CNT) continue;
+        }
+        interp.inLoop = false;
+        if(interp.code == interp.BRK || interp.code == interp.CNT)
+            interp.code=interp.OK;
+        return "";
+    });
+    /*    this.registerCommand("gets", function (interp, args) {
+        this.arity(args, 2, 3);
+        var reply; // = prompt(args[1],"");
+        process.stdin.resume();
+        process.stdin.on('data', function(str) {
+        reply = str;
+            });
+        if(args[2] != null) {
+            interp.setVar(args[2],interp.objectify(reply));
+            return reply.length;
+        } else return reply;
+        }); */
+    this.registerCommand("if", function (interp, args) {
+        this.arity(args, 3, Infinity);
+        var cond = args[1].toString();
+        var test = interp.objectify(interp.expr(interp, cond));
+        if (test.toBoolean()) return interp.eval(args[2].toString());
+        if (args.length == 3) return;
+        for (var i = 3; i < args.length; ) {
+            switch (args[i].toString()) {
+            case "else":
+                this.arity(args, i + 2);
+                return interp.eval(args[i+1].toString());
+            case "elseif":
+                this.arity(args, i + 3);
+                test = interp.objectify(interp.expr(interp, args[i+1].toString()));
+                if (test.toBoolean())
+                    return interp.eval(args[i+2].toString());
+                i += 3;
+                break;
+            default:
+                throw "Expected 'else' or 'elseif', got "+ args[i];
+            }
+        }
+    });
+    this.registerCommand("incr", function (interp, args) {
+        this.arity(args, 2, 3);
+        var name = args[1];
+        if (args.length == 2) var incr = 1;
+        else var incr = interp.objectify(args[2]).toInteger();
+        incr += interp.getVar(name).toInteger();
+        return interp.setVar(name, new TclObject(incr, "INTEGER"));
+    });
+    this.registerSubCommand("info", "args", function (interp, args) {
+        this.arity(args, 2);
+        var name = args[1].toString();
+        if (!interp.procs[name]) throw '"'+name+'" isn\'t a procedure';
+        return interp.getCommand(name).privdata[0];
+    });
+    this.registerSubCommand("info", "body", function (interp, args) {
+        this.arity(args, 2);
+        var name = args[1].toString();
+        if (!interp.procs[name]) throw '"'+name+'" isn\'t a procedure';
+        return interp.getCommand(name).privdata[1];
+    });
+    this.registerSubCommand("info", "commands", function (interp, args) {
+        return interp.mkList(interp.commands);
+    });
+    this.registerSubCommand("info", "exists", function (interp, args) {
+            var name = args[1];
+            try {interp.getVar(name); return 1;} catch(e) {return 0;}
+    });
+    this.registerSubCommand("info", "globals", function (interp, args) {
+        return interp.mkList(interp.callframe[0]);
+    });
+    this.registerSubCommand("info", "isensemble", function (interp, args) {
+        this.arity(args, 2);
+        var name = args[1].toString();
+        return (interp.getCommand(name).ensemble != null);
+    });
+    this.registerSubCommand("info", "level", function (interp, args) {
+	if(args.length == 1)
+	  return interp.level;
+	var delta = args[1];
+	return interp.levelcall[interp.level - delta];
+    });
+    this.registerSubCommand("info", "na", function (interp, args) {
+            return process.execPath;
+    });
+    this.registerSubCommand("info", "patchlevel", function (interp, args) {
+            return interp.patchlevel.toString();
+    });
+    this.registerSubCommand("info", "procs", function (interp, args) {
+        return interp.mkList(interp.procs);
+    });
+    this.registerSubCommand("info", "script", function (interp, args) {
+        return interp.script;
+    });
+    this.registerSubCommand("info", "vars", function (interp, args) {
+        return interp.mkList(interp.callframe[interp.level]);
+    });
+    this.registerCommand("join", function (interp, args) {
+	this.arity(args, 2, 3);
+	var lst = args[1].toList();
+	var sep = " ";
+	if(args.length == 3) sep = args[2].toString();
+	var res = [];
+	var re  = /^{.*}$/;
+	for (i in lst) {
+	  var word = lst[i].toString();
+	  if (re.test(word)) word = word.substring(1,word.length-1);
+	  res.push(word);
+	}
+	return res.join(sep);
+      });
+    this.registerCommand("jseval", function (interp, args) {
+        return eval(args[1].toString());
+      });
+    this.registerCommand("lappend", function (interp, args) {
+        this.arity(args, 2, Infinity);
+        var vname = args[1].toString();
+	try {
+	  var list = interp.getVar(vname);
+	} catch(e) {var list = new TclObject([]);}
+        list.toList();
+        for (var i = 2; i < args.length; i++) {
+	  list.content.push(interp.objectify(args[i]));
+        }
+        interp.setVar(vname, list);
+        return list;
+      });
+    this.registerCommand("lindex", function (interp, args) {
+        this.arity(args, 3, Infinity);
+        var list = interp.objectify(args[1]);
+        for (var i = 2; i < args.length; i++) {
+	  try {
+	    var index = list.listIndex(args[i]);
+	  } catch (e) {
+	    if (e == "Index out of bounds") return "";
+	    throw e;
+	  }
+	  list = list.content[index];
+        }
+        return interp.objectify(list);
+      });
+    this.registerCommand("list", function (interp, args) {
+	args.shift();
+	return new TclObject(args);
+      });
+    this.registerCommand("llength", function (interp, args) {
+        this.arity(args, 2);
+        return args[1].toList().length;
+      });
+    this.registerCommand("lrange", function (interp, args) {
+        this.arity(args, 4);
+        var list    = interp.objectify(args[1]);
+        var start = list.listIndex(args[2]);
+        var end     = list.listIndex(args[3])+1;
+        try {
+	  return list.content.slice(start, end);
+        } catch (e) {return [];}
+      });
+    this.registerCommand("lset", function (interp, args) {
+        this.arity(args, 4, Infinity);
+        var list = interp.getVar(args[1].toString());
+        var elt = list;
+        for (var i = 2; i < args.length-2; i++) {
+	  elt.toList();
+	  elt = interp.objectify(elt.content[elt.listIndex(args[i])]);
+        }
+        elt.toList();
+        i = args.length - 2;
+        elt.content[elt.listIndex(args[i])] = interp.objectify(args[i+1]);
+        return list;
+      });
+    this.registerCommand("lsearch", function (interp, args) {
+        this.arity(args, 3);
+        var lst = args[1].toList();
+        for(i in lst) if(lst[i] == args[2].toString()) return i;
+        return -1;
+      });
+    this.registerCommand("lsort", function (interp, args) {
+        this.arity(args, 2);
+        return args[1].toList().sort();
+      });
+    this.registerCommand("pid", function (interp, args) {
+	return process.pid;
+      });
+    this.registerCommand("puts", function (interp, args) {
+	this.arity(args, 2);
+	puts(args[1].toString());
+      });
+    this.registerCommand("pwd", function (interp, args) {
+	return process.cwd();
+      });
+    this.registerCommand("proc", function (interp, args) {
+        this.arity(args, 4);
+        var name = args[1].toString();
+        var argl = interp.parseList(args[2]);
+        var body = args[3].toString();
+        var priv = [argl, body];
+        interp.commands[name] = new TclCommand(Tcl.Proc, priv);
+        interp.procs[name]    = true;
+      });
+    this.registerCommand("regexp", function (interp, args) {
+        this.arity(args, 3);
+        var re    = new RegExp(args[1].toString());
+        var str = args[2].toString();
+        return (str.search(re) > -1? "1":"0");
+      });
+    this.registerCommand("regsub", function (interp, args) {
+        this.arity(args, 4);
+        var re    = new RegExp(args[1].toString());
+        var str = args[2].toString();
+        var trg = args[3].toString();
+        return (str.replace(re,trg));
+      });
+    this.registerCommand("rename", function (interp, args) {
+        this.arity(args, 3);
+	var name    = args[1];
+	var newname = args[2];
+	interp.commands[newname] = interp.commands[name];
+        if (interp.procs[name]) {
+	  interp.procs[name] = null;
+	  interp.procs[newname] = true;
+        }
+        interp.commands[name] = null;
+      });
+    this.registerCommand("return", function (interp, args) {
+        this.arity(args, 1, 2);
+        var r = args[1];
+        interp.code = interp.RET;
+        return r;
+    });
+    this.registerCommand("set", function (interp, args) {
+        this.arity(args, 2, 3);
+        var name = args[1];
+        if (args.length == 3) interp.setVar(name, args[2]);
+        return interp.getVar(name);
+    });
+    this.registerCommand("source", function (interp, args) {
+        this.arity(args, 2);
+        interp.script = args[1].toString();
+        try {
+	  var data = fs.readFileSync(interp.script).toString();
+        } catch(e) {
+	  throw 'couldn\' read file "'+interp.script+'": no such file or directory';}
+	var res    = interp.eval(data);
+	interp.script = "";
+	return res;
+      });
+    this.registerCommand("split", function (interp, args) {
+        this.arity(args, 2, 3);
+        var str = args[1].toString();
+        var sep = " ";
+        if (args.length == 3) sep = args[2].toString();
+	var res = [], e;
+        var tmp = str.split(sep);
+	for(i in tmp) {
+	  e = tmp[i];
+	  if(e == "") e = "{}";
+	  res.push(e);
+	}
+	return res.join(" ");
+      });
+    this.registerSubCommand("string", "equal", function (interp, args) {
+        this.arity(args, 3);
+        return (args[1].toString() == args[2].toString())? "1": "0";
+      });
+    this.registerSubCommand("string", "index", function (interp, args) {
+        this.arity(args, 3);
+        var s = args[1].toString();
+        try {
+	  return s.charAt(args[1].stringIndex(args[2]));
+        } catch (e) {return "";}
+      });
+    this.registerSubCommand("string", "length", function (interp, args) {
+        this.arity(args, 2);
+        return args[1].toString().length;
+      });
+    this.registerSubCommand("string", "range", function (interp, args) {
+        this.arity(args, 4);
+        var s = args[1];
+        try {
+            var b = s.stringIndex(args[2]);
+            var e = s.stringIndex(args[3]);
+            if (b > e) return "";
+            return s.toString().substring(b, e + 1);
+        } catch (e) {return "";}
+    });
+    this.registerSubCommand("string", "tolower", function (interp, args) {
+        this.arity(args, 2);
+        return args[1].toString().toLowerCase();
+    });
+    this.registerSubCommand("string", "toupper", function (interp, args) {
+        this.arity(args, 2);
+        return args[1].toString().toUpperCase();
+    });
+    this.registerSubCommand("string", "trim", function (interp, args) {
+        this.arity(args, 2);
+        return args[1].toString().trim();
+    });
+    function sec_msec () {
+        var t = new Date();
+        return t.getSeconds()*1000 + t.getMilliseconds();
+    }
+    this.registerCommand("time", function (interp, args) {
+        this.arity(args, 2, 3);
+        var body = args[1].toString();
+        var n    = (args.length == 3)? args[2] : 1;
+        var t0   = sec_msec();
+        for(var i = 0; i < n; i++) interp.eval(body);
+        return (sec_msec()-t0)*1000/n + " microseconds per iteration";
+    });
+    this.registerCommand("unset", function (interp, args) {
+        this.arity(args, 2, Infinity);
+        for (var i = 2; i < args.length; i++)
+            interp.setVar(args[i], null);
+    });
+    this.registerCommand("uplevel",function (interp, args) {
+        this.arity(args, 3, Infinity);
+        var delta = args[1].toInteger();
+        interp.level -= delta;
+	if(interp.level < 0) {
+	  interp.level += delta;
+	  throw 'bad level "'+delta+'"';
+	}
+        for (var i = 2; i < args.length; i++) args[i] = args[i].toString();
+        if (args.length == 3) {
+	  var code = args[2];
+        } else var code = args.slice(2).join(" ");
+        var res = interp.eval(code);
+        interp.level += delta;
+        return res;
+      });
+    this.registerCommand("while", function (interp, args) {
+        this.arity(args, 3);
+        var cond = args[1].toString();
+        var body = args[2].toString();
+        var res  = "";
+        interp.inLoop = true;
+        interp.code = interp.OK;
+        while (true) {
+	  test = interp.objectify(interp.expr(interp, cond));
+	  if (!test.toBoolean()) break;
+	  res = interp.eval(body);
+	  if(interp.code == interp.CNT) continue;
+	  if(interp.code != interp.OK)    break;
+        }
+        interp.inLoop = false;
+        if(interp.code == interp.BRK || interp.code == interp.CNT)
+	  interp.code=interp.OK;
+        return interp.objectify(res);
+      });
+    // native cmdname {function(interp, args) {...}}
+    this.registerCommand("native", function (interp, args) {
+        this.arity(args, 3);
+        var cmd = args[1].toList();
+        var func = eval(args[2].toString());
+        //alert("in: "+args[2].toString()+", func: "+ func);
+        if (cmd.length == 1) {
+	  interp.registerCommand(cmd[0].toString(), func);
+	  return;
+        }
+        base = cmd[0].toString();
+        cmd.shift();
+        interp.registerSubCommand(base, cmd.join(" "), eval(args[2].toString()));
+        return;
+      });
+    this.math = function (name, a, b) {
+      switch (name) {
+      case "+":  return a + b;
+      case "-":  return a - b;
+      case "*":  return a * b;
+      case "/":  return a / b;
+      case "%":  return a % b;
+      case "<":  return a < b? "1":"0";
+      case ">":  return a > b? "1":"0";
+      case "==": return a == b? "1":"0";
+      case "!=": return a != b? "1":"0";
+      default:   throw "Unknown operator: '"+name+"'";
+      }
+    }
+    var ops = ["+","-","*","/","%","<",">","==","!="];
+    for (i in ops)
+      this.registerCommand(ops[i],function (interp, args) {
+	  this.arity(args, 3);
+	  var name = args[0].toString();
+	  var a    = interp.objectify(args[1]);
+	  var b    = interp.objectify(args[2]);
+	  if (name == '==') 
+	    return new TclObject(a.toString() == b.toString()?"1":"0","BOOL");
+	  if (name == '!=') 
+	    return new TclObject(a.toString() != b.toString()?"1":"0","BOOL");
+	  
+	  var x = a.getNumber();
+	  var y = b.getNumber();
+	  if (a.isInteger() && b.isInteger())
+	    return new TclObject(interp.math(name, x, y),"INTEGER");
+	  if (a.isReal() && b.isReal())
+	    return new TclObject(interp.math(name, x, y),"REAL");
+	  return new TclObject(interp.math(name, args[1].toString(), 
+					   args[2].toString()));
+        });
+    this.mkList = function(x) {
+      var list = [];
+      for (var name in x) {list.push(name);}
+      return list;
+    }
+    this.objectify = function (text) {
+      if (text == null) text = "";
+      else if (text instanceof TclObject) return text;
+      return new TclObject(text);
+    }
+    this.parseString = function (text) {
+      text = text.toString();
+      switch (text.charAt(0)+text.substr(text.length-1)) {
+      case "{}":
+      case '""':
+	text = text.substr(1,text.length-2);
+      break;
+      }
+      return this.objectify(text);
+    }
+    this.parseList = function (text) {
+      text = text.toString();
+      switch (text.charAt(0)+text.substr(text.length-1)) {
+      case "{}":
+      case '""':
+	text = [text];
+      break;
+      }
+      return this.objectify(text);
+    }
+    this.call = function(args) {
+      if(_step) puts("this.call "+args);
+      var func = this.getCommand(args[0].toString());
+      var res  = func.call(this,args);
+      switch (this.code) {
+      case this.OK: case this.RET: return res;
+      case this.BRK:
+	if (!this.inLoop) throw "Invoked break outside of a loop";
+	break;
+      case this.CNT:
+	if (!this.inLoop) throw "Invoked continue outside of a loop";
+	break;
+      default: throw "Unknown return code " + this.code;
+      }
+      return res;
+    }
+}
+
+var Tcl = {};
+Tcl.isReal     = new RegExp("^[+\\-]?[0-9]+\\.[0-9]*([eE][+\\-]?[0-9]+)?$");
+Tcl.isDecimal  = new RegExp("^[+\\-]?[1-9][0-9]*$");
+Tcl.isHex      = new RegExp("^0x[0-9a-fA-F]+$");
+Tcl.isOctal    = new RegExp("^[+\\-]?0[0-7]*$");
+Tcl.isHexSeq   = new RegExp("[0-9a-fA-F]*");
+Tcl.isOctalSeq = new RegExp("[0-7]*");
+Tcl.isList     = new RegExp("[\\{\\} ]");
+Tcl.isNested   = new RegExp("^\\{.*\\}$");
+Tcl.getVar     = new RegExp("^[a-zA-Z0-9_]+", "g");
+
+Tcl.Proc = function (interp, args) {
+   var priv = this.privdata;
+   interp.incrLevel();
+   var arglist = priv[0].toList();
+   var body    = priv[1];
+   var call    = []; 
+   for(var i in args) {
+     var elt = args[i].toString();
+     if(elt.match(/ /)) elt = "{"+elt+"}";
+     call.push(elt);
+   }
+   interp.levelcall[interp.level] = call.join(" ");
+   args.shift();
+   for (var i = 0; i < arglist.length; i++) {
+       var name = arglist[i].toString();
+       if (i >= args.length) {
+           if (name == "args") {
+               interp.setVar("args", Tcl.empty);
+               break;
+           }
+       }
+       if (Tcl.isList.test(name)) {
+           name = interp.parseString(name).toList();
+           if (name[0] == "args") throw "'args' defaults to the empty string";
+           if (i >= args.length)
+               interp.setVar(name.shift(), interp.parseString(name.join(" ")));
+           else interp.setVar(name[0], interp.objectify(args[i]));
+       } else if (name == "args") {
+           interp.setVar("args", new TclObject(args.slice(i, args.length)));
+           break;
+       }
+       interp.setVar(name, interp.objectify(args[i]));
+   }
+   if (name == "args" && i+1 < arglist.length)
+       throw "'args' should be the last argument";
+   try {
+       var res = interp.eval(body);
+       interp.code = interp.OK;
+       interp.decrLevel();
+       return res;
+   } catch (e) {
+       interp.decrLevel();
+       throw "Tcl.Proc exception "+e;
+   }
+}
+/** Manage subcommands */
+Tcl.EnsembleCommand = function (interp, args) {
+   var sub    = args[1].toString();
+   var main = args.shift().toString()+" "+sub;
+   args[0] = main;
+   var ens = this.ensemble;
+   if (ens == null) {
+        throw "Not an ensemble command: "+main;
+    } else if( ens[sub] == null) {
+     var r = [];
+     for (var i in ens) r.push(i);
+     r[r.length-1] = "or "+r[r.length-1];
+     throw 'unknown or ambiguous subcommand "'+sub+'": must be '+
+     r.join(", ");
+    }
+    return ens[sub].call(interp, args);
+}
+/** Get subcommands of the current ensemble command. */
+/*
+Tcl.InfoSubcommands = function(interp, args) {
+    var r = [];
+    for (var i in this.ensemble) r.push(i);
+    return interp.objectify(r);
+}
+*/
+function TclObject(text) {
+    this.TEXT    = 0;
+    this.LIST    = 1;
+    this.INTEGER = 2;
+    this.REAL    = 3;
+    this.BOOL    = 4;
+    switch (arguments[0]) {
+    case "LIST":
+    case "INTEGER":
+    case "REAL":
+    case "BOOL":
+        this.type = this[arguments[0]];
+        break;
+    default:
+        this.type = this.TEXT;
+        if (text instanceof Array) this.type = this.LIST;
+        else text = text.toString();
+        break;
+    }
+    this.content = text;
+    this.stringIndex = function (i) {
+        this.toString();
+        return this.index(i, this.content.length);
+    }
+    this.listIndex = function (i) {
+        this.toList();
+        return this.index(i, this.content.length);
+    }
+    this.index = function (i, len) {
+        var index = i.toString();
+        if (index.substring(0,4) == "end-")
+            index = len - parseInt(index.substring(4)) - 1;
+        else if (index == "end") index = len-1;
+        else index = parseInt(index);
+        if (isNaN(index)) throw "Bad index "+i;
+        if (index < 0 || index >= len) throw "Index out of bounds";
+        return index;
+    }
+    this.isInteger = function () {return (this.type == this.INTEGER);}
+    this.isReal    = function () {return (this.type == this.REAL);}
+    this.getString = function (list, nested) {
+        var res = [];
+        for (var i in list) {
+            res[i] = list[i].toString();
+            if (Tcl.isList.test(res[i]) && !Tcl.isNested.test(res[i]))
+                res[i] = "{" + res[i] + "}";
+        }
+        if (res.length == 1) return res[0];
+        return res.join(" ");
+    }
+    this.toString = function () {
+        if (this.type != this.TEXT) {
+            if (this.type == this.LIST)
+                this.content = this.getString(this.content);
+            else this.content = this.content.toString();
+            this.type = this.TEXT;
+        }
+        return this.content;
+    }
+    this.toList = function () {
+        if (this.type != this.LIST) {
+            if (this.type != this.TEXT)
+                this.content[0] = this.content;
+            else {
+
+                var text = this.content;
+                if (text.charAt(0) == "{" && text.charAt(text.length-1) == "}")
+                    text = text.substring(1, text.length-1);
+                if (text == "")
+                    return [];
+
+                var parser = new TclParser(text.toString());
+                this.content = [];
+                for(;;) {
+                    parser.parseList();
+                    this.content.push(new TclObject(parser.getText()));
+                    if (parser.type == parser.EOL || parser.type == parser.ESC)
+                        break;
+                }
+            }
+
+            this.type = this.LIST;
+        }
+        return this.content;
+    }
+    this.toInteger = function () {
+        if (this.type == this.INTEGER) return this.content;
+        this.toString();
+        if (this.content.match(Tcl.isHex))
+            this.content = parseInt(this.content.substring(2), 16);
+        else if (this.content.match(Tcl.isOctal))
+            this.content = parseInt(this.content, 8);
+        else if (this.content.match(Tcl.isDecimal))
+            this.content = parseInt(this.content);
+        else throw "Not an integer: '"+this.content+"'";
+        if (isNaN(this.content)) throw "Not an integer: '"+this.content+"'";
+        this.type = this.INTEGER;
+        return this.content;
+    }
+    this.getFloat = function (text) {
+        if (!text.toString().match(Tcl.isReal))
+        throw "Not a real: '"+text+"'";
+        return parseFloat(text);
+    }
+    this.toReal = function () {
+        if (this.type == this.REAL)
+        return this.content;
+        this.toString();
+        // parseFloat doesn't control all the string, so need to check it
+        this.content = this.getFloat(this.content);
+        if (isNaN(this.content)) throw "Not a real: '"+this.content+"'";
+        this.type = this.REAL;
+        return this.content;
+    }
+    this.getNumber = function () {
+        try {
+            return this.toInteger();
+        } catch (e) {return this.toReal();}
+    }
+    this.toBoolean = function () {
+        if (this.type == this.BOOL) return this.content;
+        try {
+            this.content = (this.toInteger() != 0);
+        } catch (e) {
+            var t = this.content;
+            if (t instanceof Boolean) return t;
+            switch (t.toString().toLowerCase()) {
+            case "yes":case "true":case "on":
+                this.content = true;
+                break;
+            case "false":case "off":case "no":
+                this.content = false;
+                break;
+            default:
+                throw "Boolean expected, got: '"+this.content+"'";
+            }
+        }
+        this.type = this.BOOL;
+        return this.content;
+    }
+}
+function TclCommand(func, privdata) {
+  if (func == null) throw "No such function";
+  this.func     = func;
+  this.privdata = privdata;
+  this.ensemble = arguments[2];
+  
+  this.call = function(interp, args) {
+    var r = (this.func)(interp, args);
+    r = interp.objectify(r);
+    return r;
+  }
+  this.arity = function (args, min, max) {
+    if(max == undefined) max = min;
+    if (args.length < min || args.length > max) {
+      throw min + ".."+max + " words expected, got "+args.length;
+    }
+  } 
+}
+function TclParser(text) {
+  this.OK  = 0;
+  this.SEP = 0;
+  this.STR = 1;
+  this.EOL = 2;
+  this.EOF = 3;
+  this.ESC = 4;
+  this.CMD = 5;
+  this.VAR = 6;
+  this.text  = text;
+  this.start = 0;
+  this.end   = 0;
+  this.insidequote = false;
+  this.index = 0;
+  this.len = text.length;
+  this.type = this.EOL;
+  this.cur = this.text.charAt(0);
+  this.getText = function () {
+    return this.text.substring(this.start,this.end+1);
+  }
+  this.parseString = function () {
+    var newword = (this.type==this.SEP ||
+		   this.type == this.EOL || this.type == this.STR);
+    if (newword && this.cur == "{") return this.parseBrace();
+    else if (newword && this.cur == '"') {
+      this.insidequote = true;
+      this.feedchar();
+    }
+    this.start = this.index;
+    while (true) {
+      if (this.len == 0) {
+	this.end = this.index-1;
+	this.type = this.ESC;
+	return this.OK;
+      }
+      if (this.cur == "\\") {
+	if (this.len >= 2) this.feedSequence();
+      }
+      else if ("$[ \t\n\r;".indexOf(this.cur)>=0) {
+	if ("$[".indexOf(this.cur)>=0 || !this.insidequote) {
+	  this.end = this.index-1;
+	  this.type = this.ESC;
+	  return this.OK;
+	}
+      }
+      else if (this.cur == '"' && this.insidequote) {
+	this.end    = this.index-1;
+	this.type = this.ESC;
+	this.feedchar();
+	this.insidequote = false;
+	return this.OK;
+      }
+      this.feedchar();
+    }
+    return this.OK;
+  }
+  this.parseList = function () {
+    level = 0;
+    this.start = this.index;
+    while (true) {
+      if (this.len == 0) {
+	this.end = this.index;
+	this.type = this.EOL;
+	return;
+      }
+      switch (this.cur) {
+      case "\\":
+	if (this.len >= 2) this.feedSequence();
+	break;
+      case " ": case "\t": case "\n": case "\r":
+	if (level > 0) break;
+	this.end    = this.index - 1;
+	this.type = this.SEP;
+	this.feedchar();
+	return;
+      case '{': level++; break;
+      case '}': level--; break;
+      }
+      this.feedchar();
+    }
+    if (level != 0) throw "Not a list";
+    this.end = this.index;
+    return;
+  }
+  this.parseSep = function () {
+    this.start = this.index;
+    while (" \t\r\n".indexOf(this.cur)>=0) this.feedchar();
+    this.end    = this.index - 1;
+    this.type = this.SEP;
+    return this.OK;
+  }
+  this.parseEol = function () {
+    this.start = this.index;
+    while(" \t\n\r;".indexOf(this.cur)>=0) this.feedchar();
+    this.end    = this.index - 1;
+    this.type = this.EOL;
+    return this.OK;
+  }
+  this.parseCommand = function () {
+    var level = 1;
+    var blevel = 0;
+    this.feedcharstart();
+    while (true) {
+      if (this.len == 0) break;
+      if (this.cur == "[" && blevel == 0)
+	level++;
+      else if (this.cur == "]" && blevel == 0) {
+	level--;
+	if (level == 0) break;
+      } else if (this.cur == "\\") {
+	this.feedSequence();
+      } else if (this.cur == "{") {
+	blevel++;
+      } else if (this.cur == "}") {
+	if (blevel != 0) blevel--;
+      }
+      this.feedchar();
+    }
+    this.end    = this.index-1;
+    this.type = this.CMD;
+    if (this.cur == "]") this.feedchar();
+    return this.OK;
+  }
+  this.parseVar = function () {
+    this.feedcharstart();
+    this.end = this.index
+    + this.text.substring(this.index).match(Tcl.getVar).toString().length-1;
+    if (this.end == this.index-1) {
+      this.end = --this.index;
+      this.type = this.STR;
+    } else this.type = this.VAR;
+    this.setPos(this.end+1);
+    return this.OK;
+  }
+  this.parseBrace = function () {
+    var level = 1;
+    this.feedcharstart();
+    while (true) {
+      if (this.len > 1 && this.cur == "\\") {
+	this.feedSequence();
+      } else if (this.len == 0 || this.cur == "}") {
+	level--;
+	if (level == 0 || this.len == 0) {
+	  this.end = this.index-1;
+	  if (this.len > 0) this.feedchar();
+	  this.type = this.STR;
+	  return this.OK;
+	}
+      } else if (this.cur == "{") level++;
+      this.feedchar();
+    }
+    return this.OK; // unreached
+  }
+  this.parseComment = function () {
+    while (this.cur != "\n" && this.cur != "\r") this.feedchar();
+  }
+  this.getToken = function () {
+    while (true) {
+      if (this.len == 0) {
+	if (this.type == this.EOL) this.type = this.EOF;
+	if (this.type != this.EOF) this.type = this.EOL;
+	return this.OK;
+      }
+      switch (this.cur) {
+      case ' ':
+      case '\t':
+      if (this.insidequote) return this.parseString();
+      return this.parseSep();
+      case '\n':
+      case '\r':
+      case ';':
+      if (this.insidequote) return this.parseString();
+      return this.parseEol();
+      case '[': return this.parseCommand();
+      case '$': return this.parseVar();
+      }
+      if (this.cur == "#" && this.type == this.EOL) {
+	this.parseComment();
+	continue;
+      }
+      return this.parseString();
+    }
+    return this.OK; // unreached
+  }
+  this.feedSequence = function () {
+    if (this.cur != "\\") throw "Invalid escape sequence";
+    var cur = this.steal(1);
+    var specials = {};
+    specials.a = "\a";
+    specials.b = "\b";
+    specials.f = "\f";
+    specials.n = "\n";
+    specials.r = "\r";
+    specials.t = "\t";
+    specials.v = "\v";
+    switch (cur) {
+    case 'u':
+      var hex = this.steal(4);
+      if (hex != Tcl.isHexSeq.exec(hex))
+	throw "Invalid unicode escape sequence: "+hex;
+      cur = String.fromCharCode(parseInt(hex,16));
+      break;
+    case 'x':
+      var hex = this.steal(2);
+      if (hex != Tcl.isHexSeq.exec(hex))
+	throw "Invalid unicode escape sequence: "+hex;
+      cur = String.fromCharCode(parseInt(hex,16));
+      break;
+    case "a": case "b": case "f": case "n":
+    case "r": case "t": case "v":
+      cur = specials[cur];
+      break;
+    default:
+      if ("0123456789".indexOf(cur) >= 0) {
+	cur = cur + this.steal(2);
+	if (cur != Tcl.isOctalSeq.exec(cur))
+	  throw "Invalid octal escape sequence: "+cur;
+	cur = String.fromCharCode(parseInt(cur, 8));
+      }
+      break;
+    }
+    this.text[index] = cur;
+    this.feedchar();
+  }
+  this.steal = function (n) {
+    var tail = this.text.substring(this.index+1);
+    var word = tail.substr(0, n);
+    this.text = this.text.substring(0, this.index-1) + tail.substring(n);
+    return word;
+  }
+  this.feedcharstart = function () {
+    this.feedchar();
+    this.start = this.index;
+  }
+  this.setPos = function (index) {
+    var d = index-this.index;
+    this.index = index;
+    this.len -= d;
+    this.cur = this.text.charAt(this.index);
+  }
+  this.feedchar = function () {
+    this.index++;
+    this.len--;
+    if (this.len < 0)
+      throw "End of file reached";
+    this.cur = this.text.charAt(this.index);
+  }
+}
+//------------------------------------- main Read-Eval-Print loop
+var itp = new TclInterp();
+var res;
+process.argv.slice(2).forEach(function(cmd,index,array) {
+       itp.eval(cmd);
+     });
+var readline = require('readline');
+var rl = readline.createInterface(process.stdin, process.stdout);
+rl.setPrompt('% ');
+rl.prompt();
+rl.on('line', function(line) {
+    try {
+      res = itp.eval(line.trim());
+    } catch(e) {res = e;}
+    if(res != null && res.toString() != "" && res.toString().length) 
+      console.log(res.toString());
+    rl.prompt();
+  }).on('close',function() {
+    process.exit(0);
+  });

ADDED   test_tcljs.tcl
Index: test_tcljs.tcl
==================================================================
--- test_tcljs.tcl
+++ test_tcljs.tcl
@@ -0,0 +1,128 @@
+# test suite for TclJS
+# This file is designed so it can also run in a tclsh. Some JavaScript goodies,
+# like 1/0, sqrt(-1) were excluded from the tests.
+# [clock format 0] was excluded because the timezone string differed.
+
+set version 0.5.3
+set total  0
+set passed 0
+set fail   0
+puts "------------------------ [info script]"
+
+proc e.g. {cmd -> expected} {
+    incr ::total
+    incr ::fail ;# to also count exceptions
+    set mres [uplevel 1 $cmd]
+    if [!= $mres $expected] {
+	puts "**** $cmd -> $mres, expected $expected"
+    } else {incr ::passed; incr ::fail -1}
+}
+#------------------------------- commands not in real Tcl
+if [info exists auto_path] {
+    proc func {name argl body} {proc $name $argl [list expr $body]}
+    func +   {a b} {$a +  $b}
+    func !=  {a b} {$a != $b}
+    func *   {a b} {$a *  $b}
+    func ==  {a b} {$a == $b}
+    func <   {a b} {$a <  $b}
+    set noTcl 0
+} else {set noTcl 1}
+
+
+# e.g. {exec echo hello} -> hello
+
+e.g. {append new hello} -> hello
+e.g. {set x foo}        -> foo
+e.g. {append x bar}     -> foobar
+
+e.g. {set d [dict create a 1 b 2 c 3]} -> {a 1 b 2 c 3}
+e.g. {dict get $d b} -> 2
+e.g. {dict set d b 5} -> {a 1 b 5 c 3}
+e.g. {dict set d x 7} -> {a 1 b 5 c 3 x 7}
+
+e.g. {set home [file dirname [pwd]]; list} -> {}
+e.g. {string equal [set env(HOME)] $home}   -> 1
+e.g. {string equal [set ::env(HOME)] $home} -> 1
+
+e.g. {expr 6*7}         -> 42
+e.g. {expr {6 * 7 + 1}} -> 43
+e.g. {set x 43}         -> 43
+e.g. {expr {$x-1}}      -> 42
+e.g. {expr $x-1}        -> 42
+if $noTcl {
+    e.g. {clock format 0} -> {Thu Jan 01 1970 01:00:00 GMT+0100 (CET)}
+    e.g. {set i [expr 1/0]} -> Infinity
+    e.g. {expr $i==$i+42}   -> 1
+    e.g. {set n [expr sqrt(-1)]} -> NaN
+    e.g. {expr $n == $n} -> 0
+    e.g. {expr $n==$n}   -> 0
+    e.g. {expr $n!=$n}   -> 1
+}
+e.g. {expr 0xFF}   -> 255
+e.g. {expr 0376}   -> 254
+e.g. {expr 6 * 7}  -> 42
+
+e.g. {expr 1 == 2} -> 0
+e.g. {expr 1 < 2}  -> 1
+
+set forres ""
+e.g. {for {set i 0} {$i < 5} {incr i} {append forres $i}; set forres} -> 01234
+
+e.g. {set x 41}  -> 41
+e.g. {incr x}    -> 42
+e.g. {incr x 2}  -> 44
+e.g. {incr x -3} -> 41
+
+e.g. {info args e.g.} -> {cmd -> expected}
+e.g. {unset -nocomplain foo} -> {}
+e.g. {info exists foo} -> 0
+e.g. {set foo 42}      -> 42
+e.g. {info exists foo} -> 1
+e.g. {info level}      -> 0 ;# e.g. runs the command one level up
+e.g. {info patchlevel} -> $version
+
+e.g. {join {a b c}}     -> {a b c}
+e.g. {join {a b c} +}   -> {a+b+c}
+e.g. {join {a {b c} d}} -> {a b c d}
+
+e.g. {expr !0}  -> 1
+e.g. {expr !42} -> 0
+
+e.g. {regexp {X[ABC]Y} XAY}    -> 1
+e.g. {regexp {X[ABC]Y} XDY}    -> 0
+e.g. {regsub {[A-C]+} uBAAD x} -> uxD 
+
+e.g. {split "a b  c d"}     -> {a b {} c d}
+e.g. {split " a b  c d"}     -> {{} a b {} c d}
+e.g. {split "a b  c d "}     -> {a b {} c d {}}
+e.g. {split usr/local/bin /} -> {usr local bin}
+
+e.g. {string equal foo foo}   -> 1
+e.g. {string equal foo bar}   -> 0
+e.g. {string index abcde 2}   -> c
+e.g. {string length ""}       -> 0
+e.g. {string length foo}      -> 3
+e.g. {string range hello 1 3} -> ell
+e.g. {string tolower TCL}     -> tcl
+e.g. {string toupper tcl}     -> TCL
+e.g. {string trim " foo "}    -> foo
+
+e.g. {set x {a b c}} -> {a b c}
+e.g. {lappend x d}   -> {a b c d}
+e.g. {set x}         -> {a b c d}
+e.g. {lset x 3 e}    -> {a b c e}
+e.g. {llength $x}    -> 4
+e.g. {lindex $x 2}   -> c
+e.g. {lrange $x 1 2} -> {b c}
+e.g. {lsearch $x b}  -> 1
+e.g. {lsearch $x y}  -> -1
+e.g. {lsort {z x y}} -> {x y z}
+
+e.g. {proc f x {set y 0; info vars}} -> ""
+e.g. {f 41} -> {x y} ;# must fix proc call in uplevel issue
+set tmp [f 41]; e.g. {set tmp} -> {x y}
+e.g. {info args f} -> x
+e.g. {info body f} -> {set y 0; info vars}
+#e.g. {f 42} -> {x y} ;# must fix proc call in uplevel issue
+
+puts "total $total tests, passed $passed, failed $fail"