Function parseThreadPermissionString

lib/permissions/prefixes.js:22–63

(
  threadPermissionString: string,
)

  +membershipPrefix: ?ThreadPermissionMembershipPrefix,
};
function parseThreadPermissionString(
  threadPermissionString: string,
): ParsedThreadPermissionString {
  let remainingString = threadPermissionString;

  let propagationPrefix;
  for (const key of Object.keys(threadPermissionPropagationPrefixes)) {
    const prefix = threadPermissionPropagationPrefixes[key];
    if (!remainingString.startsWith(prefix)) {
      continue;
    }
    propagationPrefix = prefix;
    remainingString = remainingString.substr(prefix.length);
    break;
  }

  let filterPrefix;
  for (const key of Object.keys(threadPermissionFilterPrefixes)) {
    const prefix = threadPermissionFilterPrefixes[key];
    if (!remainingString.startsWith(prefix)) {
      continue;
    }
    filterPrefix = prefix;
    remainingString = remainingString.substr(prefix.length);
    break;
  }

  let membershipPrefix;
  for (const key of Object.keys(threadPermissionMembershipPrefixes)) {
    const prefix = threadPermissionMembershipPrefixes[key];
    if (!remainingString.startsWith(prefix)) {
      continue;
    }
    membershipPrefix = prefix;
    remainingString = remainingString.substr(prefix.length);
    break;
  }

  const permission = assertThreadPermission(remainingString);

  return { permission, propagationPrefix, filterPrefix, membershipPrefix };
}

function constructThreadPermissionString(
  parsed: ParsedThreadPermissionString,