"""XML escape helpers for FODT output."""

from __future__ import annotations

import re
from xml.sax.saxutils import escape as _xml_escape


def escape_text(s: str) -> str:
    if not s:
        return ""
    return _xml_escape(s, {"\"": """, "'": "'"})


_LABEL_RE = re.compile(r"[^\w\-]+", re.UNICODE)


def xml_id(name: str | None, prefix: str = "obj") -> str:
    if not name:
        return prefix
    cleaned = _LABEL_RE.sub("-", name.strip()).strip("-")
    return f"{prefix}-{cleaned or 'x'}"