Method matches

bpython/autocomplete.py:468–497

(
        self,
        cursor_offset: int,
        line: str,
        *,
        locals_: dict[str, Any] | None = None,
        **kwargs: Any,
    )

class DictKeyCompletion(BaseCompletionType):
    def matches(
        self,
        cursor_offset: int,
        line: str,
        *,
        locals_: dict[str, Any] | None = None,
        **kwargs: Any,
    ) -> set[str] | None:
        if locals_ is None:
            return None

        r = self.locate(cursor_offset, line)
        if r is None:
            return None
        current_dict_parts = lineparts.current_dict(cursor_offset, line)
        if current_dict_parts is None:
            return None

        dexpr = current_dict_parts.word
        try:
            obj = safe_eval(dexpr, locals_)
        except EvaluationError:
            return None
        if isinstance(obj, dict) and obj.keys():
            matches = {
                f"{k!r}]" for k in obj.keys() if repr(k).startswith(r.word)
            }
            return matches if matches else None
        else:
            return None

    def locate(self, cursor_offset: int, line: str) -> LinePart | None:
        return lineparts.current_dict_key(cursor_offset, line)