/*
 * jQuery plugin: fieldSelection - v0.1.0 - last change: 2006-12-16
 * (c) 2006 Alex Brem <alex@0xab.cd> - http://blog.0xab.cd
 */

(function() {
    var fieldSelection = {
        getSelection: function() {
            var e = this.jquery ? this[0] : this;

            return (
                /* mozilla / dom 3.0 */
                ('selectionStart' in e && function() {
                    var l = e.selectionEnd - e.selectionStart;
                    return {
                        start: e.selectionStart,
                        end: e.selectionEnd,
                        length: l,
                        text: e.value.substr(e.selectionStart, l)};
                })

                /* exploder */
                || (document.selection && function() {
                    e.focus();

                    var r = document.selection.createRange();
                    if (r == null) {
                        return {
                            start: 0,
                            end: e.value.length,
                            length: 0};
                    }

                    var re = e.createTextRange();
                    var rc = re.duplicate();
                    re.moveToBookmark(r.getBookmark());
                    rc.setEndPoint('EndToStart', re);

                    // IE bug - it counts newline as 2 symbols when getting selection coordinates,
                    //  but counts it as one symbol when setting selection
                    var rcLen = rc.text.length,
                        i,
                        rcLenOut = rcLen;
                    for (i = 0; i < rcLen; i++) {
                        if (rc.text.charCodeAt(i) == 13) rcLenOut--;
                    }
                    var rLen = r.text.length,
                        rLenOut = rLen;
                    for (i = 0; i < rLen; i++) {
                        if (r.text.charCodeAt(i) == 13) rLenOut--;
                    }

                    return {
                        start: rcLenOut,
                        end: rcLenOut + rLenOut,
                        length: rLenOut,
                        text: r.text};
                })

                /* browser not supported */
                || function() {
                    return {
                        start: 0,
                        end: e.value.length,
                        length: 0};
                }

            )();

        },

        setSelection: function(start, end) {
            var e = document.getElementById($(this).attr('id')); // I don't know why... but $(this) don't want to work today :-/
            if (!e) {
                return $(this);
            } else if (e.setSelectionRange) { /* WebKit */
                e.focus(); e.setSelectionRange(start, end);
            } else if (e.createTextRange) { /* IE */
                var range = e.createTextRange();
                range.collapse(true);
                range.moveEnd('character', end);
                range.moveStart('character', start);
                range.select();
            } else if (e.selectionStart) { /* Others */
                e.selectionStart = start;
                e.selectionEnd = end;
            }

            return $(this);
        },

        replaceSelection: function() {
            var e = this.jquery ? this[0] : this;
            var text = arguments[0] || '';

            return (
                /* mozilla / dom 3.0 */
                ('selectionStart' in e && function() {
                    e.value = e.value.substr(0, e.selectionStart) + text + e.value.substr(e.selectionEnd, e.value.length);
                    return this;
                })

                /* exploder */
                || (document.selection && function() {
                    e.focus();
                    document.selection.createRange().text = text;
                    return this;
                })

                /* browser not supported */
                || function() {
                    e.value += text;
                    return this;
                }
            )();
        }
    };

    jQuery.each(fieldSelection, function(i) { jQuery.fn[i] = this; });

})();