Function parseFileUrl

src/util/functions/loadFunction.ts:106–134

(fileUrl: string)

 * @returns The file path and optional function name
 */
export function parseFileUrl(fileUrl: string): { filePath: string; functionName?: string } {
  if (!fileUrl.startsWith('file://')) {
    throw new Error('URL must start with file://');
  }

  const urlWithoutProtocol = fileUrl.slice('file://'.length);
  const lastColonIndex = urlWithoutProtocol.lastIndexOf(':');

  if (lastColonIndex > 1) {
    const candidateFilePath = urlWithoutProtocol.slice(0, lastColonIndex);

    // Only executable function files support a :functionName suffix. This preserves
    // colons that are part of a valid file or directory name on POSIX systems.
    if (!isJavascriptFile(candidateFilePath) && !candidateFilePath.endsWith('.py')) {
      return {
        filePath: normalizeFilePath(urlWithoutProtocol),
      };
    }

    return {
      filePath: normalizeFilePath(candidateFilePath),
      functionName: urlWithoutProtocol.slice(lastColonIndex + 1),
    };
  }

  return {
    filePath: normalizeFilePath(urlWithoutProtocol),
  };
}