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To Artifact [5a91eaf6f4]:

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  var sqrt = "";
  sqrt = Math.sqrt; // "publish" other Math.* functions as needed

  /* ==================== command expr ===================================== */
  interp.registerCommand("::expr", function (interp, args) {
    var result = null;
    var retcode;
print("::expr!"+args+"!");
    if (args.length == 2) {
      result = new Array();
      /* seems to be a braced expression argument */
      retcode = interp.eval_expression.evalExpression(args[1], result);
print("::expr retcode!"+retcode+"!"+result[0]+"!");
      // for being compatible with Tcl we need to return 0 or 1 instead of true or false!!
      result = result[0];
      if (result == "true") {
        return interp.objectify("1");
      }
      if (result == "false") {
        return interp.objectify("0");
      }
      return result;
      if (result.toString() == "true") {
        result = interp.objectify("1");
      } else {
        if (result.toString() == "false") {
          result = interp.objectify("0");
        } else {
          result = interp.objectify(result);
	}
      }
      interp.default_obj.setResult(result);
      return retcode;
    }
    var str = args.splice(0, args.length).join(' ');
    retcode = interp.eval_expression.evalExpression(args[1], result);
    // for being compatible with Tcl we need to return 0 or 1 instead of true or false!!
    if (result == "true") {
      return interp.objectify("1");
    }
    if (result == "false") {
      return interp.objectify("0");
    }
    return result
      result = interp.objectify("1");
    } else {
      if (result == "false") {
        result = interp.objectify("0");
      } else {
        result = interp.objectify(result);
      }
    }
    interp.default_obj.setResult(result);
    return retcode;
  });

  /* ==================== command file join ===================================== */
  interp.registerSubCommand("::file", "join", function (interp, args) {
    args.shift();
    this.requireMinArgc(args, 1, "file join", "");
    var path = args.shift();
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      interp.setVar(args[2],interp.statement_parser.objectify(reply));
      return reply.length;
    } else return reply;
  });

  /* ==================== command if ===================================== */
  interp.registerCommand("::if", function (interp, args) {
    args.shift();
    this.requireMinArgc(args, 2, "if", "");
    var cond = args.shift();
    var body = args.shift();
    cond = cond.toExprTree();
    var res = interp.eval_statement.evalExprSubTree(cond, null, 0);
    res = res.toBoolean();
    if (res) {
      var result = interp.eval_statement.eval(body);
      return result;
    }
    if (args.length == 0) {
      return;
    }
    for (var i = 0; i < args.length; ) {
      switch (args[i].toString()) {
      case "else":
        this.requireExactArgc(args, i + 2, "if", "");
        return interp.eval_statement.eval(args[i+1]);
      case "elseif":
        this.requireMinArgc(args, i + 3, "if", "");
    var idx = 1;
    var bool = new Array();
    var retcode;
    var current = 1;
    var falsebody = 0;
    var err = false;
    var argc = args.length;

    if (args.length >= 3) {
      while (1) {
        /* Far not enough arguments given! */
        if (current >= argc) {
          err = true;
          break;
        }
        if ((retval = interp.eval_expression.getBoolFromExpr(args[current++], bool)) != interp.OK) {
          return retval;
	}
	bool = bool[0];
        /* There lacks something, isn't it? */
        if (current >= argc) {
          err = true;
	  break;
        }
        if (args[current] == "then") {
          current++;
	}
        /* Tsk tsk, no then-clause? */
        if (current >= argc) {
          err = true;
	  break;
	}
        if (bool) {
          return interp.eval_statement.evalObj(args[current]);
	}
        /* Ok: no else-clause follows */
        if (++current >= argc) {
          interp.default_obj.setResult(intp.string_obj_type.newEmptyStringObj());
          return interp.OK;
        }
        falsebody = current++;
        if (args[falsebody] == "else") {
          /* IIICKS - else-clause isn't last cmd? */
          if (current != argc - 1) {
            err = true;
	    break
	  }
          return interp.eval_statement.evalObj(args[current]);
        } else {
          if (args[falsebody] == "elseif") {
        test = interp.statement_parser.objectify(interp.eval_statement.eval("::set _ "+args[i+1].toString()));
        if (test.toBoolean()) {
          return interp.eval_statement.eval(args[i+2].toString());
        }
        i += 3;
        break;
            /* Ok: elseif follows meaning all the stuff
             * again (how boring...) 
	     */
            continue;
	  } else {
            /* OOPS - else-clause is not last cmd? */
            if (falsebody != argc - 1) {
              err = true;
	      break;
	    }
            return interp.eval_statement.evalObj(args[falsebody]);
	  }
	}
      }
      if (!err) {
        return interp.OK;
      default:
        throw "Expected 'else' or 'elseif', got "+ args[i];
      }
    }
    interp.wrongNumArgs(1, args, "condition ?then? trueBody ?elseif ...? ?else? falseBody");
    return interp.ERROR;
  });

  /* ==================== command incr ===================================== */
  interp.registerCommand("::incr", function (interp, args) {
    args.shift();
    this.requireArgcRange(args, 1, 2, "incr", "");
    var name = args.shift();
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    args.shift();
    var result = eval(args[0].toString());
    return result;
  });

  /* ==================== command puts ===================================== */
  interp.registerCommand("::puts", function (interp, args) {
    args.shift();
print("::puts!"+args+"!");
    var idx = 1;
    this.requireMinArgc(args, 1, "puts", "");
    if ((args[0] == "stderr") || (args[0] == "stdout")) {
      args.shift();
    if ((args[1] == "stderr") || (args[1] == "stdout")) {
      idx++;
    }
    var val = args.shift();
    var val = args[idx];
    print(val);
    var result = interp.objectify("");
    return result;
  });

  /* ==================== command proc ===================================== */
  interp.registerCommand("::proc", function (interp, args) {
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