Function dereferenceArgsVariables

src/service/action-impl.js:1132–1163

(args, event, opt_args)

 * @private
 */
export function dereferenceArgsVariables(args, event, opt_args) {
  if (!args) {
    return args;
  }
  const data = opt_args || {};
  if (event) {
    const detail = getDetail(/** @type {!Event} */ (event));
    if (detail) {
      data['event'] = detail;
    }
  }
  const applied = map();
  Object.keys(args).forEach((key) => {
    let value = args[key];
    // Only JSON expression strings that contain dereferences (e.g. `foo.bar`)
    // are processed as ActionInfoArgExpressionDef. We also support
    // dereferencing strings like `foo` iff there is a corresponding key in
    // `data`. Otherwise, `foo` is treated as a string "foo".
    if (typeof value == 'object' && value.expression) {
      const expr = /** @type {ActionInfoArgExpressionDef} */ (value).expression;
      const exprValue = getValueForExpr(data, expr);
      // If expr can't be found in data, use null instead of undefined.
      value = exprValue === undefined ? null : exprValue;
    }
    if (data[value]) {
      applied[key] = data[value];
    } else {
      applied[key] = value;
    }
  });
  return applied;
}

/**
 * @param {string} s