Function _parse_hstore

lib/sqlalchemy/dialects/postgresql/hstore.py:362–401

Parse an hstore from its literal string representation. Attempts to approximate PG's hstore input parsing rules as closely as possible. Although currently this is not strictly necessary, since the current implementation of hstore's output syntax is stricter than what it accepts as i

(hstore_str: str)

def _parse_hstore(hstore_str: str) -> _HSTORE_VAL:
    """Parse an hstore from its literal string representation.

    Attempts to approximate PG's hstore input parsing rules as closely as
    possible. Although currently this is not strictly necessary, since the
    current implementation of hstore's output syntax is stricter than what it
    accepts as input, the documentation makes no guarantees that will always
    be the case.



    """
    result: _HSTORE_VAL = {}
    pos = 0
    pair_match = HSTORE_PAIR_RE.match(hstore_str)

    while pair_match is not None:
        key = pair_match.group("key").replace(r"\"", '"').replace("\\\\", "\\")
        if pair_match.group("value_null"):
            value = None
        else:
            value = (
                pair_match.group("value")
                .replace(r"\"", '"')
                .replace("\\\\", "\\")
            )
        result[key] = value

        pos += pair_match.end()

        delim_match = HSTORE_DELIMITER_RE.match(hstore_str[pos:])
        if delim_match is not None:
            pos += delim_match.end()

        pair_match = HSTORE_PAIR_RE.match(hstore_str[pos:])

    if pos != len(hstore_str):
        raise ValueError(_parse_error(hstore_str, pos))

    return result


def _serialize_hstore(val: _HSTORE_VAL) -> str: