/* =================================================== -*- 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
 */
// 'use strict'; // breaks some tests, like expr 0376, for loop
var _step = 0; // set to 1 for debugging
if(process.env["DEBUG"] == 1) _step = 1;
var fs    = require('fs');
var puts  = console.log; // saves a lot of typing... ;^)

function TclInterp () {
    this.patchlevel = "0.5.3";
    this.callframe  = [{}];
    this.level      = 0;
    this.levelcall  = [];
    this.commands   = {};
    this.procs      = [];
    this.script     = "";
    this.getsing    = 0;
    this.OK  = 0;
    this.RET = 1;
    this.BRK = 2;
    this.CNT = 3;
    this.getVar = function(name) {
        var nm  = name.toString();
	// no arrays supported yet, but a read-only exception for ::env()
        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 (val != null && val.toString().match(/\\/))
	val = eval("'"+val.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";

      } catch (e) {
	var msg = code.substr(0,128);
	if(msg.length >= 125) msg += "...";
	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);
	if(_step) puts("e: "+e);
	throw e;
      }
    }
    this.eval2 = function(code) {
      this.code  = this.OK;
      var parser = new TclParser(code);
      var args   = [];

	  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("after", function (interp, args) {
        this.arity(args, 3);
	var code = args[2].toString();
	setTimeout(args[1], function(code) {interp.eval(code)});
	});*/
    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("continue", function (interp, args) {
        interp.code = interp.CNT;
        return;
      });
    this.registerSubCommand("clock", "format", function (interp, args) {
        var now = new Date();
        now.setTime(args[1]*1000);
        var ts = now.toString().split(" ");
	var tz = ts[6].toString().replace("(","").replace(")","");
	return ts[0]+" "+ts[1]+" "+ts[2]+" "+ts[4]+" "+tz+" "+ts[3];
      });
    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]);

    var 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
      var mx;
      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 val = interp.getVar(mx[i].slice(1)).toString();
	if(isNaN(val) || !isFinite(val)) val = '"'+val+'"';
	eval("var "+mx[i]+' = '+val);
      }
      var res = eval(expression);
      if(res == false) res = 0; else if(res == true) res = 1;
      return res;
    };
    this.registerSubCommand("file", "atime", function (interp, args) {
        this.arity(args, 2);
	var stat = fs.statSync(args[1].toString());
	return stat.atime.getTime()/1000;
      })
    this.registerSubCommand("file", "dirname", function (interp, args) {
        this.arity(args, 2);
	return interp.dirname(args[1].toString());
     });
    this.dirname = function(p) { // also used in [glob]
      //require("path"); //not working :(
      //return path.dirname(p.toString());
      if(p == ".") p = process.cwd();
      p = p.split("/"); 
      p.pop();
      if(p == "") return("/");
      return p.join("/");
    };
    this.registerSubCommand("file", "exists", function (interp, args) {
        this.arity(args, 2);
	var file = args[1].toString();
	try {var fd = fs.openSync(file,"r");} catch(e) {return 0;}
	fs.closeSync(fd);
	return 1;
     });
    this.registerSubCommand("file", "extension", function (interp, args) {
        this.arity(args, 2);
	var fn  = args[1].toString();
	var res = fn.split(".").pop();
	res = (res == fn)? "" : "."+res;
	return res;
     });
    this.registerSubCommand("file", "mtime", function (interp, args) {
        this.arity(args, 2);
	var stat = fs.statSync(args[1].toString());
	return stat.mtime.getTime()/1000;
      })
    this.registerSubCommand("file", "size", function (interp, args) {
        this.arity(args, 2);
	var stat = fs.statSync(args[1].toString());
	return stat.size;
      })
    this.registerSubCommand("file", "tail", function (interp, args) {
        this.arity(args, 2);
	return args[1].toString().split("/").pop();
      });
    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();

	if(fmt=="%x") {
	  var x = new Number(val);
	  return x.toString(16);
	} else if(fmt=="%X") {
	  var x = new Number(val);
	  return x.toString(16).toUpperCase();
	}
	else throw "unknown format";	

      });

   this.registerCommand("gets0", function (interp, args) {
	this.arity(args, 2, 3);

	interp.getsing = 1;
	//interp.buf = "";
	//while(interp.buf == "") {
	//interp.timeout = setTimeout(function(){}, 10000);
	//  if(interp.getsing==0) break;
	//}
	return; // result will be in interp.buf when done
     });
   this.gets = function(char) {
     try {
       if(char.match(/foo[\r\n]/)) {
	 this.getsing = 0;
	 puts("received: "+this.buf);
       } else {
	 puts("<"+char+">"+this.getsing);
	 this.buf += char;
       }
     } catch(e) {puts(e)};
   }
   this.registerCommand("glob", function (interp, args) {
	this.arity(args, 2, Infinity);
	args.shift();

	var res    = [];
	var prefix = "";
	var dir    = ".";
	for (var arg in args) {
	  var path    = args[arg].toString();
	  if(path.match("[/]")) {
	     var dir    = interp.dirname(path);
	     var prefix = dir+"/";
	  }
	  var pattern = path.split("/").pop().replace(/[*]/g,".*");
	  var files   = fs.readdirSync(dir);
	  for (var i in files) {
	    if(files[i].match("^[.]")) continue;
	    if(files[i] == pattern) {res.push(files[i]);}
	    if(files[i].match("^"+pattern+"$")) {
	      var file = (dir == ".")? files[i] : dir+"/"+files[i];
	      res.push(file.replace(/\/\//,"/"));
	    }
	  }
	}
	return res;

      });

    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; ) {

        return interp.mkList(interp.procs);
    });
    this.registerSubCommand("info", "script", function (interp, args) {
        return interp.script;
    });
    this.registerSubCommand("info", "vars", function (interp, args) {
	var res = [];
	for(var i in interp.callframe[interp.level]) {
	  try {
	    if(interp.getVar(i) != null) {res.push(i);}
	  } catch(e) {};
	}
	return res;
    });
    this.registerCommand("join", function (interp, 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("lreverse", function (interp, args) {
        this.arity(args, 2);
        return args[1].toList().reverse();

        if (args.length == 3) interp.setVar(name, val);
        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,{encoding: 'utf8'}).toString();
        } catch(e) {
	  puts("e: "+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 = (args.length == 3)? args[2].toString() : " ";

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    = []; 

       } 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 matches = 0, lastmatch = "";
    for (var i in ens) { // maybe unambiguous prefix?
      if (i.match("^"+sub) != null) {
	matches  += 1;
	lastmatch = i;
      } 
    }
    if(matches == 1) {

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 res = (this.func)(interp, args);
    res = interp.objectify(res);
    return res;
  }
  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;
    }
  } 

  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 == "\\") { // works not :(
	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 () {
    var level  = 0;
    this.start = this.index;
    while (true) {
      if (this.len == 0) {
	this.end  = this.index;
	this.type = this.EOL;
	return;
      }

      }
      if (this.cur == "#" && this.type == this.EOL) {
	this.parseComment();
	continue;
      }
      return this.parseString();
    }

    //return this.OK; // unreached
  }
  this.feedSequence = function () {
    //return;
    if (this.cur != "\\") throw "Invalid escape sequence";
    var cur = this.steal(1);
    puts("enter feedSequence, text: "+this.text+" cur: "+cur);
    var specials = {};

    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();
itp.gets = function(line) {
  if (itp.getsing == 0) {
    try {
      res = itp.eval(line.trim());
    } catch(e) {res = e;}
    if (itp.getsing == 0) {
      if(res != null && res.toString().length) 
	puts(res.toString());
      rl.prompt();



    }
  } else {itp.buf = line; itp.getsing = 0; rl.prompt();}
};
rl.on('line', itp.gets).on('close',function() {process.exit(0);});