"""Decode source text without silently replacing characters in localisations."""
import io
import tokenize
from pathlib import Path

from app.converter.rpy_lexer import ParseError


def read_source(path: Path) -> str:
    raw = path.read_bytes()
    try:
        encoding, _ = tokenize.detect_encoding(io.BytesIO(raw).readline)
        return raw.decode(encoding)
    except (UnicodeError, SyntaxError, LookupError) as exc:
        raise ParseError(f"Не удалось прочитать кодировку сценария: {exc}", path.name) from exc