/**
     * Extends EditorParaBase with IE support
     * @class Plugin.EditorParaIE
     * @extends Plugin.EditorParaBase
     * @constructor
     * @module editor
     * @submodule editor-para-ie
     */


    var EditorParaIE = function() {
        EditorParaIE.superclass.constructor.apply(this, arguments);
    }, HOST = 'host', NODE_CHANGE = 'nodeChange',
    P = 'p';


    Y.extend(EditorParaIE, Y.Plugin.EditorParaBase, {
        /**
        * nodeChange handler to handle fixing an empty document.
        * @private
        * @method _onNodeChange
        */
        _onNodeChange: function(e) {
            var host = this.get(HOST), inst = host.getInstance(),
                btag = inst.EditorSelection.DEFAULT_BLOCK_TAG,
                prev, LAST_CHILD = ':last-child', para, b, para2,
                lc, lc2, found = false;

            switch (e.changedType) {
                case 'enter-up':
                    para = ((this._lastPara) ? this._lastPara : e.changedNode);
                    b = para.one('br.yui-cursor');

                    if (this._lastPara) {
                        delete this._lastPara;
                    }

                    if (b) {
                        if (b.previous() || b.next()) {
                            if (b.ancestor(P)) {
                                b.remove();
                            }
                        }
                    }
                    if (!para.test(btag)) {
                        para2 = para.ancestor(btag);
                        if (para2) {
                            para = para2;
                            para2 = null;
                        }
                    }
                    if (para.test(btag)) {
                        prev = para.previous();
                        if (prev) {
                            lc = prev.one(LAST_CHILD);
                            while (!found) {
                                if (lc) {
                                    lc2 = lc.one(LAST_CHILD);
                                    if (lc2) {
                                        lc = lc2;
                                    } else {
                                        found = true;
                                    }
                                } else {
                                    found = true;
                                }
                            }
                            if (lc) {
                                host.copyStyles(lc, para);
                            }
                        }
                    }
                    break;
                case 'enter':
                    if (e.changedNode.test('br')) {
                        e.changedNode.remove();
                    } else if (e.changedNode.test('p, span')) {
                        b = e.changedNode.one('br.yui-cursor');
                        if (b) {
                            b.remove();
                        }
                    }
                    break;
            }
        },
        initializer: function() {
            var host = this.get(HOST);
            if (host.editorBR) {
                Y.error('Can not plug EditorPara and EditorBR at the same time.');
                return;
            }

            host.on(NODE_CHANGE, Y.bind(this._onNodeChange, this));
        }
    }, {
        /**
        * editorPara
        * @static
        * @property NAME
        */
        NAME: 'editorPara',
        /**
        * editorPara
        * @static
        * @property NS
        */
        NS: 'editorPara',
        ATTRS: {
            host: {
                value: false
            }
        }
    });

    Y.namespace('Plugin');

    Y.Plugin.EditorPara = EditorParaIE;