RS Following is source for Tcl in Javascript:
/*==================================================== -*- C++ -*-
* tcl.js "A Tcl implementation in Javascript"
*
* Released under the same terms as Tcl itself.
* (BSD license found at <https://www.tcl-lang.org/software/tcltk/license.html>)
*
* Based on Picol by Salvatore Sanfilippo (<http://antirez.com/page/picol>)
* (c) Stéphane Arnold 2007
* Richard Suchenwirth 2007: cleanup, additions
* vim: syntax=javascript autoindent softtabwidth=4
*/
_step = 0 // set to 1 for debugging
function TclInterp () {
this.callframe = new Array(new Object());
this.level = 0;
this.commands = new Object();
this.procs = new Array();
this.OK = 0;
this.RET = 1;
this.BRK = 2;
this.CNT = 3;
this.getVar = function(name) {
var val = this.callframe[this.level][name];
if (val == null) throw "No such variable: "+name;
return val;
}
this.setVar = function(name, val) {
this.callframe[this.level][name] = val;
return val;
}
this.incrLevel = function() {
this.callframe[++this.level] = new Object();
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.renameCommand = function (name, newname) {
this.commands[newname] = this.commands[name];
if (this.procs[name]) {
this.procs[name] = null;
this.procs[newname] = true;
}
this.commands[name] = null;
}
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 = new Object();
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, new Object());
ens[name] = cmd;
ens = cmd.ensemble;
ens["subcommands"] = new TclCommand(Tcl.InfoSubcommands, null);
}
}
ens[subcmd] = new TclCommand(func, privdata);
}
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();
if (args.length == 1) var code = args[0];
else var code = args.join("\",\"");
var script="$(\"" + selector + "\")." + fn + "(\"" + code + "\")";
eval(script).toString();
return "dom " + selector;
});
}
this.registerCommand("eval",function (interp, args) {
this.requireMinArgc(args, 2);
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("while", function (interp, args) {
this.requireExactArgc(args, 3);
var cond = "set _ "+args[1].toString();
var body = args[2].toString();
var res = "";
interp.inLoop = true;
interp.code = interp.OK;
while (true) {
test = interp.objectify(interp.eval(cond));
if (!test.toBoolean()) break;
res = 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 interp.objectify(res);
});
this.registerCommand("for", function (interp, args) {
this.requireExactArgc(args, 5);
interp.eval(args[1].toString());
if(interp.code != interp.OK) return;
var cond = "set _ "+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.eval(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.requireExactArgc(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("if", function (interp, args) {
this.requireMinArgc(args, 3);
var test = interp.objectify(interp.eval("set _ "+args[1].toString()));
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.requireExactArgc(args, i + 2);
return interp.eval(args[i+1].toString());
case "elseif":
this.requireMinArgc(args, i + 3);
test = interp.objectify(interp.eval("set _ "+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];
}
}
// unreached
});
this.registerCommand("incr", function (interp, args) {
this.requireArgcRange(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.registerCommand("puts", function (interp, args) {
this.requireExactArgc(args, 2);
alert(args[1]);
});
this.registerCommand("proc", function (interp, args) {
this.requireExactArgc(args, 4);
var name = args[1].toString();
var argl = interp.parseList(args[2]);
var body = args[3].toString();
var priv = new Array(argl,body);
interp.commands[name] = new TclCommand(Tcl.Proc, priv);
interp.procs[name] = true;
});
// native cmdname {function(interp, args) {...}}
this.registerCommand("native", function (interp, args) {
this.requireExactArgc(args, 3);
cmd = args[1].toList();
if (cmd.length == 1) {
interp.registerCommand(cmd[0].toString(), eval(args[2].toString()));
return;
}
base = cmd[0].toString();
cmd.shift();
interp.registerSubCommand(base, cmd.join(" "), eval(args[2].toString()));
return;
});
this.registerCommand("set", function (interp, args) {
this.requireArgcRange(args, 2, 3);
var name = args[1];
if (args.length == 3) interp.setVar(name, args[2]);
return interp.getVar(name);
});
this.registerCommand("unset", function (interp, args) {
this.requireExactArgc(args, 2);
interp.setVar(args[1], null);
});
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;
case ">": return a > b;
case "=": case "==": return a == b;
case "!=": return a != b;
default: throw "Unknown operator: '"+name+"'";
}
}
var ops = ["+","-","*","/","%","<",">","=","==","!="];
for (i in ops)
this.registerCommand(ops[i],function (interp, args) {
this.requireExactArgc(args, 3);
var name = args[0].toString();
var a = interp.objectify(args[1]);
var b = interp.objectify(args[2]);
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, x, y).toString());
});
this.registerCommand("and", function (interp, args) {
this.requireExactArgc(args, 3);
var a = interp.objectify(args[1]).toBoolean();
var b = interp.objectify(args[2]).toBoolean();
return (a && b);
});
this.registerCommand("or", function (interp, args) {
this.requireExactArgc(args, 3);
var a = interp.objectify(args[1]).toBoolean();
var b = interp.objectify(args[2]).toBoolean();
return (a || b);
});
this.registerCommand("not", function (interp, args) {
this.requireExactArgc(args, 2);
return !(interp.objectify(args[1]).toBoolean());
});
this.registerCommand("lindex", function (interp, args) {
this.requireMinArgc(args, 3);
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("llength", function (interp, args) {
this.requireExactArgc(args, 2);
return args[1].toList().length;
});
this.registerCommand("lsort", function (interp, args) {
this.requireExactArgc(args, 2);
return args[1].toList().sort();
});
this.registerCommand("list", function (interp, args) {
args.shift();
return new TclObject(args);
});
this.registerCommand("append", function (interp, args) {
this.requireMinArgc(args, 2);
var vname = args[1].toString();
if (interp.callframe[interp.level][vname] != null) {
var str = interp.getVar(vname);
} else var str = "";
for (var i = 2; i < args.length; i++) {
str += args[i].toString();
}
interp.setVar(vname, str);
return str;
});
this.registerCommand("lappend", function (interp, args) {
this.requireMinArgc(args, 2);
var vname = args[1].toString();
if (interp.callframe[interp.level][vname] != null) {
var list = interp.getVar(vname);
} else 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("lset", function (interp, args) {
this.requireMinArgc(args, 4);
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("lrange", function (interp, args) {
this.requireExactArgc(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 new Array();}
});
this.registerCommand("break", function (interp, args) {
interp.code = interp.BRK;
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", "scan", function (interp, args) {
return Date.parse(args[1]);
});
this.registerSubCommand("clock", "seconds", function (interp, args) {
return (new Date()).valueOf();
});
sqrt = Math.sqrt; // "publish" other Math.* functions as needed
this.registerCommand("expr", function (interp, args) {
return eval(args[1].toString());
});
this.registerCommand("gets", function (interp, args) {
this.requireArgcRange(args, 2, 3);
var reply = prompt(args[1],"");
if(args[2] != null) {
interp.setVar(args[2],interp.objectify(reply));
return reply.length;
} else return reply;
});
this.registerSubCommand("info", "commands", function (interp, args) {
var list = new Array();
for (var name in interp.commands) {list.push(name);}
return list;
});
this.registerSubCommand("info", "procs", function (interp, args) {
var list = new Array();
for (var name in interp.procs) {list.push(name);}
return list;
});
this.registerSubCommand("info", "body", function (interp, args) {
this.requireExactArgc(args, 2);
var name = args[1].toString();
if (!interp.procs[name]) throw "Not a procedure: "+name;
return interp.getCommand(name).privData[1];
});
this.registerSubCommand("info", "isensemble", function (interp, args) {
this.requireExactArgc(args, 2);
var name = args[1].toString();
return (interp.getCommand(name).ensemble != null);
});
this.registerCommand("jseval", function (interp, args) {
return eval(args[1].toString());
});
this.registerCommand("regexp", function (interp, args) {
this.requireExactArgc(args, 3);
var re = new RegExp(args[1].toString());
var str = args[2].toString();
return str.search(re);
});
this.registerCommand("rename", function (interp, args) {
this.requireExactArgc(args, 3);
interp.renameCommand(args[1], args[2]);
});
this.registerSubCommand("string", "equal", function (interp, args) {
this.requireExactArgc(args, 3);
return (args[1].toString() == args[2].toString());
});
this.registerSubCommand("string", "index", function (interp, args) {
this.requireExactArgc(args, 3);
var s = args[1].toString();
try {
return s.charAt(args[1].stringIndex(args[2]));
} catch (e) {return "";}
});
this.registerSubCommand("string", "range", function (interp, args) {
this.requireExactArgc(args, 4);
var s = args[1];
try {
var b = s.stringIndex(args[2].toString());
var e = s.stringIndex(args[3].toString());
if (b > e) return "";
return s.toString().substring(b, e + 1);
} catch (e) {return "";}
});
this.registerCommand("return", function (interp, args) {
this.requireArgcRange(args, 1, 2);
var r = args[1];
interp.code = interp.RET;
return r;
});
this.registerCommand("source", function (interp, args) {
this.requireExactArgc(args, 2);
return Tcl.Source(interp, args[1]);
});
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 = new Array(text);
break;
}
return this.objectify(text);
}
this.call = function(args) {
if(_step && !confirm("this.call "+args)) throw "user abort";
var func = this.getCommand(args[0].toString());
var r = func.call(this,args);
switch (this.code) {
case this.OK:
case this.RET:
return r;
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 r;
}
this.eval = function (code) {
try {
return this.eval2(code);
} catch (e) {
if(!confirm(e+"/"+e.description+"\nwhile evaluating "+code.substr(0,128)+"..."))
throw(e);
}
}
this.eval2 = function(code) {
this.code = this.OK;
var parser = new TclParser(code);
var args = new Array(0);
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)) {
try {
text = this.getVar(text);
} catch (e) {throw "No such variable '"+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) {
result = this.call(args);
if (this.code != this.OK) return this.objectify(result);
}
args = new Array();
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);
}
//---------------------- goodies if jQuery is available
if(typeof(jQuery) != 'undefined') {
this.eval("proc puts s {dom \"<div style='font-family:Courier'>$s</div>\" appendTo body}");
}
}
var Tcl = new Object();
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.Source = function (interp, url) {
var xhr_object = null;
if(window.ActiveXObject) // Internet Explorer
xhr_object = new ActiveXObject("Microsoft.XMLHTTP");
else if(window.XMLHttpRequest) // Firefox
xhr_object = new XMLHttpRequest();
else { // XMLHttpRequest non supporté par le navigateur
alert("Your browser does not support XMLHTTP requests. " +
"Sorry that we cannot deliver this page.");
return;
}
xhr_object.open("GET", url, false);
xhr_object.send(null);
return interp.eval(xhr_object.responseText);
}
Tcl.Proc = function (interp, args) {
var priv = this.privdata;
interp.incrLevel();
var arglist = priv[0].toList();
var body = priv[1];
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 r = interp.eval(body);
interp.code = interp.OK;
interp.decrLevel();
return r;
} 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 || ens[sub] == null) {
throw "Not an ensemble command: "+main;
}
return ens[sub].call(interp, args);
}
/** Get subcommands of the current ensemble command. */
Tcl.InfoSubcommands = function(interp, args) {
var r = new Array();
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 = new Array();
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.getList = function (text) {
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());
var content = new Array();
for (var i = 0; ; i++) {
parser.parseList();
content[i] = new TclObject(parser.getText());
if (parser.type == parser.EOL || parser.type == parser.ESC)
break;
}
return content;
}
this.toList = function () {
if (this.type != this.LIST) {
if (this.type != this.TEXT) this.content[0] = this.content;
else this.content = this.getList(this.content);
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);
if (r != null) interp.setVar("_", r);
return r;
}
this.requireExactArgc = function (args, argc) {
if (args.length != argc) {
throw argc+" arguments expected, got "+args.length;
}
}
this.requireMinArgc = function (args, argc) {
if (args.length < argc) {
throw argc+" arguments expected at least, got "+args.length;
}
}
this.requireArgcRange = function (args, min, max) {
if (args.length < min || args.length > max) {
throw min+" to "+max+" arguments 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 = new Object();
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);
}
}