Selection = function(input) {
    this.isTA = (this.input = input).nodeName.toLowerCase() == "textarea";
};
with ({ o: Selection.prototype }) {
    o.setCaret = function(start, end) {
        var o = this.input;
        if (Selection.isStandard)
            o.setSelectionRange(start, end);
        else if (Selection.isSupported) {
            var t = this.input.createTextRange();
            end -= start + o.value.slice(start + 1, end).split("\n").length - 1;
            start -= o.value.slice(0, start).split("\n").length - 1;
            t.move("character", start), t.moveEnd("character", end), t.select();
        }
    };
    o.getCaret = function() {
        var o = this.input;
        if (Selection.isStandard)
            return { start: o.selectionStart, end: o.selectionEnd };
        else if (Selection.isSupported) {
            var s = (this.input.focus(), document.selection.createRange()), r, start, end, value;
            if (s.parentElement() != o)
                return { start: 0, end: 0 };
            if (this.isTA ? (r = s.duplicate()).moveToElementText(o) : r = o.createTextRange(), !this.isTA)
                return r.setEndPoint("EndToStart", s), { start: r.text.length, end: r.text.length + s.text.length };
            for (var $ = "[###]"; (value = o.value).indexOf($) + 1; $ += $);
            r.setEndPoint("StartToEnd", s), r.text = $ + r.text, end = o.value.indexOf($);
            s.text = $, start = o.value.indexOf($);
            if (document.execCommand && document.queryCommandSupported("Undo"))
                for (r in { 0: 0, 0: 0 })
                document.execCommand("Undo");
            return o.value = value, this.setCaret(start, end), { start: start, end: end };
        }
        return { start: 0, end: 0 };
    };
    o.getText = function() {
        var o = this.getCaret();
        return this.input.value.slice(o.start, o.end);
    };
    o.setText = function(text) {
        var o = this.getCaret(), i = this.input, s = i.value;
        i.value = s.slice(0, o.start) + text + s.slice(o.end);
        this.setCaret(o.start += text.length, o.start);
    };
    new function() {
        var d = document, o = d.createElement("input"), s = Selection;
        s.isStandard = "selectionStart" in o;
        s.isSupported = s.isStandard || (o = d.selection) && !!o.createRange();
    };
}