test.html

<!-- ng-class style -->
<button class="btn btn-default" ng-keypress="{enter: doStuff, up-arrow: doStuff2}">Activate Me!</button>

<!-- dual attribtues -->
<button class="btn-default" ng-keypress="doStuff" key="up-arrow">Activate Me!</button>

Oh, my bad. That's a typo.

See, Angular has support for this; this is exactly what they do in the ng-class directive. So, I believe $parse is what we'd be looking for... but we can check the code of ng-class.