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Input validation for a `Buffer`.
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Error raised by :meth:`.Validator.validate`.
:param cursor_position: The cursor position where the error occurred.
:param message: Text.
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Abstract base class for an input validator.
A validator is typically created in one of the following two ways:
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thread, this can be wrapped in a :class:`.ThreadedValidator`.
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Validate the input.
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:param document: :class:`~prompt_toolkit.document.Document` instance.
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Return a `Future` which is set when the validation is ready.
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Create a validator from a simple validate callable. E.g.:
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:param validate_func: Callable that takes the input string, and returns
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Validate input from a simple callable.
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Wrapper that runs input validation in a thread.
(Use this to prevent the user interface from becoming unresponsive if the
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Run the `validate` function in a thread.
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Validator class that accepts any input.
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Validator that can be switched on/off according to
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Validator class that can dynamically returns any Validator.
:param get_validator: Callable that returns a :class:`.Validator` instance.
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