def builder_from_source(source, filename, system_includes,<EOL>nonsystem_includes, quiet=False):
return ASTBuilder(tokenize.get_tokens(source),<EOL>filename,<EOL>system_includes,<EOL>nonsystem_includes,<EOL>quiet=quiet)<EOL>
Utility method that returns an ASTBuilder from source code.

    Args:
      source: 'C++ source code'
      filename: 'file1'

    Returns:
      ASTBuilder