errors.py

from typing import Union


class ParseError(Exception):
    def __init__(self, code: str, *args: Union[str, None]):
        self.code = code
        self.args = args
        self.message = get_error_message(code, args)


def get_error_message(code: str, args: tuple[Union[str, None], ...]) -> str:
    if code == "E0001":
        return "Generic error"
    if code == "E0002":
        return "Expected an entry start"
    if code == "E0003":
        return f'Expected token: "{args[0]}"'
    if code == "E0004":
        return f'Expected a character from range: "{args[0]}"'
    if code == "E0005":
        msg = 'Expected message "{}" to have a value or attributes'
        return msg.format(args[0])
    if code == "E0006":
        msg = 'Expected term "-{}" to have a value'
        return msg.format(args[0])
    if code == "E0007":
        return "Keyword cannot end with a whitespace"
    if code == "E0008":
        return "The callee has to be an upper-case identifier or a term"
    if code == "E0009":
        return "The argument name has to be a simple identifier"
    if code == "E0010":
        return "Expected one of the variants to be marked as default (*)"
    if code == "E0011":
        return 'Expected at least one variant after "->"'
    if code == "E0012":
        return "Expected value"
    if code == "E0013":
        return "Expected variant key"
    if code == "E0014":
        return "Expected literal"
    if code == "E0015":
        return "Only one variant can be marked as default (*)"
    if code == "E0016":
        return "Message references cannot be used as selectors"
    if code == "E0017":
        return "Terms cannot be used as selectors"
    if code == "E0018":
        return "Attributes of messages cannot be used as selectors"
    if code == "E0019":
        return "Attributes of terms cannot be used as placeables"
    if code == "E0020":
        return "Unterminated string expression"
    if code == "E0021":
        return "Positional arguments must not follow named arguments"
    if code == "E0022":
        return "Named arguments must be unique"
    if code == "E0024":
        return "Cannot access variants of a message."
    if code == "E0025":
        return f"Unknown escape sequence: \\{args[0]}."
    if code == "E0026":
        return f"Invalid Unicode escape sequence: {args[0]}."
    if code == "E0027":
        return "Unbalanced closing brace in TextElement."
    if code == "E0028":
        return "Expected an inline expression"
    if code == "E0029":
        return "Expected simple expression as selector"
    return code