def _parse_identifier(sql, example, anonymize_values):
  """Parse the part relative to an Identifier in the SQL query."""
  successful_copy = True
  for item in sql:
    if item.ttype == sqlparse.tokens.Text.Whitespace:
      continue

    if _is_identifier(item):
      successful_copy = _parse_identifier(item, example,
                                          anonymize_values) and successful_copy
      continue

    if _is_order(item):
      _add_simple_step(item, example)
      continue

    if (_is_table_alias(item) or (_is_punctuation(item) and item.value == '.')):
      _add_simple_step(item, example)
      continue

    if _is_keyword(item) and item.value in ('as',):
      _add_simple_step(item, example)
      continue

    if _is_name(item):
      entity = _find_simple_entity(item.value, example)
      if entity is not None:
        schema_copy_action = None

        if isinstance(entity, DatabaseTable):
          schema_copy_action = SchemaEntityCopy(copied_table=entity)
        elif isinstance(entity, TableColumn):
          schema_copy_action = SchemaEntityCopy(copied_column=entity)
        else:
          raise ValueError('Type of entity is unexpected: ' + str(type(entity)))

        copy_action = SQLAction(entity_copy=schema_copy_action)
        example.gold_sql_query.actions.append(copy_action)
      else:
        try:
          _resolve_reference(item, example)
        except AttributeError as e:
          # Generally this means the reference wasn't found i.e., in WikiSQL, a
          # value didn't have quotes, so just add it as a value
          print(e)
          successful_copy = _add_simple_value(
              item, example, anonymize_values) and successful_copy
      continue

    if _is_literal(item):
      prev_len = len(example.gold_sql_query.actions)
      successful_copy = _add_simple_value(item, example,
                                          anonymize_values) and successful_copy
      if len(example.gold_sql_query.actions) == prev_len:
        raise ValueError(
            'Gold query did not change length when adding simple value!')
      continue

    _debug_state(item, example)
    raise ParseError('Incomplete _parse_identifier')

  return successful_copy
Parse the part relative to an Identifier in the SQL query.
language/xsp/data_preprocessing/sql_parsing.py