Программирование, т. 5.1.

var gotoLabels= {};
var whileLabels = {};

// overload the oritinal Selenium reset function
Selenium.prototype.reset = function() {
  // reset the labels
  this.initialiseLabels();
  // proceed with original reset code
  this.defaultTimeout = Selenium.DEFAULT_TIMEOUT;
  this.browserbot.selectWindow("null");
  this.browserbot.resetPopups();
}

Selenium.prototype.initialiseLabels = function()
{
gotoLabels  = {};
whileLabels = { ends: {}, whiles: {} };
var command_rows = [];
var numCommands = testCase.commands.length;
for (var i = 0; i < numCommands; ++i) {
   var x = testCase.commands[i];
   command_rows.push(x);
}	
var cycles = [];
for( var i = 0; i < command_rows.length; i++ ) {
	if (command_rows[i].type == 'command')
	switch( command_rows[i].command.toLowerCase() ) {
		case "label":
			gotoLabels[ command_rows[i].target ] = i;
			break;
		case "while":
		case "endwhile":
			cycles.push( [command_rows[i].command.toLowerCase(), i] )
			break;	
	}
}
var i = 0;	
while( cycles.length ) {
	if( i >= cycles.length ) {
		throw new Error( "non-matching while/endWhile found" );
	}
	switch( cycles[i][0] ) {
		case "while":
			 if(	( i+1 < cycles.length )  && ( "endwhile" == cycles[i+1][0] ) ) {
				 // pair found
				 whileLabels.ends[ cycles[i+1][1] ] = cycles[i][1];
				 whileLabels.whiles[ cycles[i][1] ] = cycles[i+1][1];
				 cycles.splice( i, 2 );
				 i = 0;
			 } else ++i;
			 break;
		 case "endwhile":
			 ++i;
			 break;
	}
}
}	

Selenium.prototype.continueFromRow = function( row_num )
{
if(row_num == undefined || row_num == null || row_num < 0) {
	throw new Error( "Invalid row_num specified." );
}
testCase.debugContext.debugIndex = row_num;
}

// do nothing. simple label
Selenium.prototype.doLabel	  = function(){};

Selenium.prototype.doGotolabel  = function( label )
{
if( undefined == gotoLabels[label] ) {
	throw new Error( "Specified label '" + label + "' is not found." );
}
this.continueFromRow( gotoLabels[ label ] );
};

Selenium.prototype.doGoto = Selenium.prototype.doGotolabel;

Selenium.prototype.doGotoIf = function( condition, label )
{
if( eval(condition) ) this.doGotolabel( label );
}

Selenium.prototype.doWhile = function( condition )
{
if( !eval(condition) ) {
	var last_row = testCase.debugContext.debugIndex;
	var end_while_row = whileLabels.whiles[ last_row ];
	if( undefined == end_while_row ) throw new Error( "Corresponding 'endWhile' is not found." );
	this.continueFromRow( end_while_row );
}
}

Selenium.prototype.doEndWhile = function()
{
var last_row = testCase.debugContext.debugIndex;
var while_row = whileLabels.ends[ last_row ] - 1;
if( undefined == while_row ) throw new Error( "Corresponding 'While' is not found." );
this.continueFromRow( while_row );