mirror of
https://github.com/python-escpos/python-escpos
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66a2e78e16
* fix unfinished Python2 -> 3 translation * remove some six usage * annotate * fix regression in Six removal * mypy: self.enf is always defined * fix return type of cups.py * Usb idVendor/idProduct are integers * self.default_args is always defined * tweak usb_args, PEP589 is better * lp.py: reassure mypy * correctly cast call to CashDrawerError() * update CUPS test * add missing close() method in metaclass * document a bug in typeshed * query_status() returns bytes as seen in constants.py * remove more SIX usage * test examples too * remove type comment where type is annotated * adapt behavior of cups printer to match other implementations --------- Co-authored-by: Patrick Kanzler <dev@pkanzler.de> Co-authored-by: Patrick Kanzler <4189642+patkan@users.noreply.github.com>
71 lines
1.9 KiB
Python
71 lines
1.9 KiB
Python
#!/usr/bin/python
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# -*- coding: utf-8 -*-
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"""This module contains the implementation of the CupsPrinter printer driver.
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:author: python-escpos developers
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:organization: `python-escpos <https://github.com/python-escpos>`_
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:copyright: Copyright (c) 2012-2023 Bashlinux and python-escpos
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:license: MIT
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"""
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from typing import List
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from ..escpos import Escpos
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def is_usable() -> bool:
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"""Indicate whether this component can be used due to dependencies."""
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return True
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class Dummy(Escpos):
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"""Dummy printer.
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This class is used for saving commands to a variable, for use in situations where
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there is no need to send commands to an actual printer. This includes
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generating print jobs for later use, or testing output.
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inheritance:
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.. inheritance-diagram:: escpos.printer.Dummy
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:parts: 1
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"""
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@staticmethod
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def is_usable() -> bool:
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"""Indicate whether this printer class is usable.
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Will return True if dependencies are available.
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Will return False if not.
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"""
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return is_usable()
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def __init__(self, *args, **kwargs) -> None:
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"""Init with empty output list."""
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Escpos.__init__(self, *args, **kwargs)
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self._output_list: List[bytes] = []
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def _raw(self, msg: bytes) -> None:
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"""Print any command sent in raw format.
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:param msg: arbitrary code to be printed
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"""
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self._output_list.append(msg)
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@property
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def output(self) -> bytes:
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"""Get the data that was sent to this printer."""
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return b"".join(self._output_list)
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def clear(self) -> None:
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"""Clear the buffer of the printer.
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This method can be called if you send the contents to a physical printer
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and want to use the Dummy printer for new output.
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"""
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del self._output_list[:]
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def close(self) -> None:
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"""Close not implemented for Dummy printer."""
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pass
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