def ini_parse()

in python/moz/l10n/formats/ini/parse.py [0:0]
65 lines of code
23 McCabe index (conditional complexity)

def ini_parse(source: TextIO | str | bytes) -> Resource[Message]:
    """
    Parse an .ini file into a message resource.

    The parsed resource will not include any metadata.
    """
    if isinstance(source, str):
        file: TextIO = StringIO(source)
    elif isinstance(source, bytes):
        file = StringIO(source.decode())
    else:
        file = source
    cfg = ini.INIConfig(file, optionxformvalue=None)

    resource = Resource[Message](Format.ini, [])
    section: Section[Message] | None = None
    pattern: list[str] | None = None
    comment = ""

    def add_comment(cl: str | None) -> None:
        nonlocal comment
        if cl is not None:
            cv = cl[1:] if cl and cl.startswith(" ") else cl
            comment = f"{comment}\n{cv}" if comment else cv

    for line in ini_lines(cfg._data):
        if pattern:
            if isinstance(line, ini.ContinuationLine):
                pattern[0] += "\n" + line.value
                continue
            elif isinstance(line, ini.EmptyLine):
                pattern[0] += "\n"
            else:
                pattern[0] = pattern[0].rstrip("\n")
                pattern = None
        if isinstance(line, ini.SectionLine):
            add_comment(line.comment)
            section = Section((line.name,), [], comment)
            comment = ""
            resource.sections.append(section)
        elif isinstance(line, ini.OptionLine):
            if not section:
                raise ValueError(f"Unexpected value {line.name} before section header")
            add_comment(line.comment)
            pattern = [line.value]
            msg = PatternMessage(pattern)  # type: ignore[arg-type]
            section.entries.append(Entry((line.name,), msg, comment))
            comment = ""
        elif isinstance(line, ini.CommentLine):
            add_comment(line.comment)
        elif isinstance(line, ini.EmptyLine):
            if comment:
                if section:
                    section.entries.append(Comment(comment))
                else:
                    resource.comment = (
                        f"{resource.comment}\n\n{comment}"
                        if resource.comment
                        else comment
                    )
                comment = ""
        else:
            raise ValueError(f"Unexpected {line.__class__.__name__}: {line.__dict__}")
    if pattern:
        pattern[0] = pattern[0].rstrip("\n")
    if comment:
        if section:
            section.entries.append(Comment(comment))
        else:
            resource.comment = (
                f"{resource.comment}\n\n{comment}" if resource.comment else comment
            )
    return resource