function specialKey()

in tapestry-contrib/src/org/apache/tapestry/contrib/form/MaskEdit.js [164:228]
64 lines of code
14 McCabe index (conditional complexity)

function specialKey(e) { // deal with special keys like backspace, delete etc
    var s = getEventObject(e);
    var code = e.keyCode;
    dontDoIt = true;  // Moz needs these, as I can't seem to cancel events properly
    isTab = false;    // Moz can't handle tabs well either
    switch (code) {
    case 8:   // backspace
        var b = getPrevEdit(s);
        if (b) {
            b.display.innerHTML = displayMaskChar(b.mask);
            var i = b.index;
            b.field.value = b.field.value.substr(0, i) + 
                displayMaskChar(b.mask) + b.field.value.substr(i+1, b.field.value.length - i);
            b.focus();
        }
        cancelEvent(e);
        return false;
    case 46:  // delete
        if (s.display) {
            s.display.innerHTML = displayMaskChar(s.mask);
            var i = s.index;
            s.field.value = s.field.value.substr(0, i) + displayMaskChar(s.mask) + 
                s.field.value.substr(i+1, s.field.value.length - i);
        }
        cancelEvent(e);
        return false;
        break;
    case 37: // left
        var p = getPrevEdit(s);
        if (p) {
            p.focus();
        }
        cancelEvent(e);
        return false;
    case 39: // right
        var n = getNextEdit(s);
        if (n) {
            n.focus();
        }
        cancelEvent(e);
        return false;
    case 36: // home
        s.div.firstChild.focus();
        cancelEvent(e);
        return false;
    case 35: // end
        s.div.lastChild.focus();
        cancelEvent(e);
        return false;
    case 9: // tab
        if (navigator.appName == "Microsoft Internet Explorer") {
            if (!e.shiftKey) {
                s.div.lastChild.focus();
            } else {
                s.div.firstChild.focus();
            }
            return;
        } else {  // is mozilla/netscape
            isTab = true;  // best i can do really
        }
        break;
    }
       
    dontDoIt = false;
}