from __future__ import annotations
from typing import NamedTuple, TypeVar, Generic

class Position(NamedTuple):
    index: int
    line: int
    col: int

    def __str__(self) -> str:
        return f"{self.line}:{self.col}"

class Span(NamedTuple):
    begin: Position
    end: Position

    def to(self, end: Span) -> Span:
        return Span(self.begin, end.end)

    def __str__(self) -> str:
        return f"{self.begin} to {self.end}"


T = TypeVar("T")


class Node(Generic[T]):
    def __init__(self, value: T, span: Span) -> None:
        super().__init__()
        self.value = value
        self.span = span

    def __str__(self) -> str:
        return str(self.value)