Function getAttrsForDirectiveMatching

packages/compiler/src/render3/view/util.ts:207–230

* Extract a map of properties to values for a given element or template node, which can be used * by the directive matching machinery. * * @param elOrTpl the element or template in question * @return an object set up for directive matching. For attributes on the element/template, this * object

(elOrTpl: t.Element | t.Template)

 * property name to an empty string.
 */
function getAttrsForDirectiveMatching(elOrTpl: t.Element | t.Template): {[name: string]: string} {
  const attributesMap: {[name: string]: string} = {};

  if (elOrTpl instanceof t.Template && elOrTpl.tagName !== 'ng-template') {
    elOrTpl.templateAttrs.forEach((a) => (attributesMap[a.name] = ''));
  } else {
    elOrTpl.attributes.forEach((a) => {
      if (!isI18nAttribute(a.name)) {
        attributesMap[a.name] = a.value;
      }
    });

    elOrTpl.inputs.forEach((i) => {
      if (i.type === BindingType.Property || i.type === BindingType.TwoWay) {
        attributesMap[i.name] = '';
      }
    });
    elOrTpl.outputs.forEach((o) => {
      attributesMap[o.name] = '';
    });
  }

  return attributesMap;
}