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from abc import ABCMeta, abstractmethod
from typing import TypeVar, Generic, NoReturn, Callable
from ._error import CruException
_T = TypeVar("_T")
class ParseException(CruException):
def __init__(
self, message, text: str, line_number: int | None = None, *args, **kwargs
):
super().__init__(message, *args, **kwargs)
self._text = text
self._line_number = line_number
@property
def text(self) -> str:
return self._text
@property
def line_number(self) -> int | None:
return self._line_number
class Parser(Generic[_T], metaclass=ABCMeta):
def __init__(self, name: str) -> None:
self._name = name
@property
def name(self) -> str:
return self._name
@abstractmethod
def parse(self, s: str) -> _T:
raise NotImplementedError()
def raise_parse_exception(
self, text: str, line_number: int | None = None
) -> NoReturn:
a = f" at line {line_number}" if line_number is not None else ""
raise ParseException(f"Parser {self.name} failed{a}.", text, line_number)
class SimpleLineConfigParser(Parser[list[tuple[str, str]]]):
def __init__(self) -> None:
super().__init__(type(self).__name__)
def _parse(self, s: str, callback: Callable[[str, str], None]) -> None:
for ln, line in enumerate(s.splitlines()):
line_number = ln + 1
# check if it's a comment
if line.strip().startswith("#"):
continue
# check if there is a '='
if line.find("=") == -1:
self.raise_parse_exception("There is even no '='!", line_number)
# split at first '='
key, value = line.split("=", 1)
key = key.strip()
value = value.strip()
callback(key, value)
def parse(self, s: str) -> list[tuple[str, str]]:
items = []
self._parse(s, lambda key, value: items.append((key, value)))
return items
def parse_to_dict(
self, s: str, /, allow_override: bool = False
) -> tuple[dict[str, str], list[tuple[str, str]]]:
result: dict[str, str] = {}
duplicate: list[tuple[str, str]] = []
def add(key: str, value: str) -> None:
if key in result:
if allow_override:
duplicate.append((key, result[key]))
result[key] = value
else:
self.raise_parse_exception(f"Key '{key}' already exists!", None)
result[key] = value
self._parse(s, add)
return result, duplicate
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