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Editing File: /home/ubuntu/combine_ai/combine/lib/python3.10/site-packages/dotenv/variables.py

import re
from abc import ABCMeta, abstractmethod
from typing import Iterator, Mapping, Optional, Pattern

_posix_variable: Pattern[str] = re.compile(
    r"""
    \$\{
        (?P<name>[^\}:]*)
        (?::-
            (?P<default>[^\}]*)
        )?
    \}
    """,
    re.VERBOSE,
)

class Atom(metaclass=ABCMeta):
    def __ne__(self, other: object) -> bool:
        result = self.__eq__(other)
        if result is NotImplemented:
            return NotImplemented
        return not result

@abstractmethod
    def resolve(self, env: Mapping[str, Optional[str]]) -> str: ...

class Literal(Atom):
    def __init__(self, value: str) -> None:
        self.value = value

def __repr__(self) -> str:
        return f"Literal(value={self.value})"

def __eq__(self, other: object) -> bool:
        if not isinstance(other, self.__class__):
            return NotImplemented
        return self.value == other.value

def __hash__(self) -> int:
        return hash((self.__class__, self.value))

def resolve(self, env: Mapping[str, Optional[str]]) -> str:
        return self.value

class Variable(Atom):
    def __init__(self, name: str, default: Optional[str]) -> None:
        self.name = name
        self.default = default

def __repr__(self) -> str:
        return f"Variable(name={self.name}, default={self.default})"

def __eq__(self, other: object) -> bool:
        if not isinstance(other, self.__class__):
            return NotImplemented
        return (self.name, self.default) == (other.name, other.default)

def __hash__(self) -> int:
        return hash((self.__class__, self.name, self.default))

def resolve(self, env: Mapping[str, Optional[str]]) -> str:
        default = self.default if self.default is not None else ""
        result = env.get(self.name, default)
        return result if result is not None else ""

def parse_variables(value: str) -> Iterator[Atom]:
    cursor = 0

for match in _posix_variable.finditer(value):
        (start, end) = match.span()
        name = match["name"]
        default = match["default"]

if start > cursor:
            yield Literal(value=value[cursor:start])

yield Variable(name=name, default=default)
        cursor = end

length = len(value)
    if cursor < length:
        yield Literal(value=value[cursor:length])

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