Method getGeo_

src/service/url-replacements-impl.js:784–794

* Resolves the value via geo service. * @param {function(!../../extensions/amp-geo/0.1/amp-geo.GeoDef)} getter * @param {string} expr * @return {!Promise<{[key: string]: (string|Array >} * @template T * @private

(getter, expr)

   * @private
   */
  getGeo_(getter, expr) {
    if (this.cachedGeo_ !== null) {
      return getter(this.cachedGeo_);
    }

    return Services.geoForDocOrNull(this.ampdoc.getHeadNode()).then((geo) => {
      userAssert(geo, 'To use variable %s, amp-geo should be configured', expr);
      this.cachedGeo_ = geo;
      return getter(geo);
    });
  }

  /**
   * Returns cached uach signal if available, calculate it if not.