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

This emulates (in part) an interpreter for the Tcl scripting language. Early versions were tested in browsers, but since the advent of node.js, I only use that, like a tclsh (interactive or with script file(s) to evaluate).

The test suite is also frequently tested against a real tclsh, currently 8.5.13. Only a few tests dealing with special numbers (Infinity, NaN) are skipped when real Tcl runs.

The tcljs project has a home at http://code.google.com/p/tcl-js/. 
Version control via mercurial (hg). 
Also via Fossil at https://chiselapp.com/user/suchenwi/repository/tcl-js/dir?ci=tip

I used to develop this with node.js v0.6.19 (which was standard via apt-get). Now that backslash escapes are finally working, the test suite (which is in UTF-8) needs to be parsed as such, so I upgraded to node.js v0.10.22.

On the command line you can pass code snippets that are executed before the Read-Eval-Print loop is entered For instance, this runs the test suite:

$ DEBUG=0 node tcl053.js "source /home/suchenwi/tcl-js/test_tcljs.tcl"

With DEBUG=1, all commands are reported before execution, and all exceptions.

Still missing:
- blocking [exec]
- blocking [gets]
- [expr] to also accept command calls in braced expressions, e.g.
        if {[llength $x] > 2} ...
- [open], [puts] to file, [close]
-
- and many more...

	if(found) {
	  if(i == list.length) i -= 2;
	    list.splice(i, 2);
	    interp.setVar(name, dict);
	}
	return dict;
      });












    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("exit",function (interp, args) {
	this.arity(args, 1,2);
	var rc = 0;
	if (args.length == 2) rc = args[1];
	process.exit(rc);
      });




    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
      var mx;
      var acos = Math.acos;
      var exp  = Math.exp;
      var sqrt = Math.sqrt; // "publish" other Math.* functions as needed
      try {
	mx = expression.match(/(\[.*\])/g);
	for (var 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 (var i in mx) {

        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; // will be 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    = "";

    });
    this.registerSubCommand("info", "exists", function (interp, args) {
        this.arity(args, 2);
	var name = args[1];
	try {interp.getVar(name); return 1;} catch(e) {return 0;}
    });
    this.registerSubCommand("info", "globals", function (interp, args) {
        return interp.infovars(0);
    });







    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", "nameofexecutable", function (interp, args) {
            return process.execPath;
    });
    this.registerSubCommand("info", "patchlevel", function (interp, args) {
	return interp.patchlevel;
    });
    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.infovars(interp.level);
      });
    this.infovars = function(level) { // also used in [info globals]
      var res = [];
      for(var i in this.callframe[level]) {
	try {
	  if(this.getVar(i) != null) {res.push(i);}
	} catch(e) {};
      }
      return res;

    }
    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  = /^{.*}$/;