replicate behaviour of angular 'replace' in directives (will be removed in future angularjs versions)

angular-replace-behaviour

/// Replace element with it's first child
Utils.replaceWithChild = function(element) {
    var child = angular.element(element[0].firstChild);
    Utils.mergeAttributes(element, child);
    element.replaceWith(child);
}

/// Copy attributes from sourceElement to targetElement, merging their values if the attribute is already present
Utils.mergeAttributes = function(sourceElement, targetElement) {
    var arr = sourceElement[0].attributes;
    for(var i = 0; i < arr.length; i++) {
        var item = arr[i];
        if(!item.specified)
            continue;

        var key = item.name;
        var sourceVal = item.value;
        var targetVal = targetElement.attr(key);

        if(sourceVal === targetVal)
            continue;

        var newVal = targetVal === undefined
            ? sourceVal
            : sourceVal + ' ' + targetVal;

        targetElement.attr(key, newVal);
    }
}

angular.module('test')
.directive('unwrap', function() {
    return {
        restrict: 'AE',
        templateUrl: 'unwrap.part.html',
        compile: function() {
            return function postCompile(scope, element, attr) {
                Utils.replaceWithChild(element);
            };
        }
    }; 
});