/**
 * 选取路径命令
 * @file
 */
UE.plugins['elementpath'] = function(){
    var currentLevel,
        tagNames,
        me = this;
    me.setOpt('elementPathEnabled',true);
    if(!me.options.elementPathEnabled){
        return;
    }
    me.commands['elementpath'] = {
        execCommand : function( cmdName, level ) {
            var start = tagNames[level],
                range = me.selection.getRange();
            currentLevel = level*1;
            range.selectNode(start).select();
        },
        queryCommandValue : function() {
            //产生一个副本，不能修改原来的startElementPath;
            var parents = [].concat(this.selection.getStartElementPath()).reverse(),
                names = [];
            tagNames = parents;
            for(var i=0,ci;ci=parents[i];i++){
                if(ci.nodeType == 3) {
                    continue;
                }
                var name = ci.tagName.toLowerCase();
                if(name == 'img' && ci.getAttribute('anchorname')){
                    name = 'anchor';
                }
                names[i] = name;
                if(currentLevel == i){
                   currentLevel = -1;
                    break;
                }
            }
            return names;
        }
    };
};

