100 lines
3.2 KiB
Python
100 lines
3.2 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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"""
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ghostscript - A Python interface for the Ghostscript interpreter C-API
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"""
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#
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# Modifications 2018 by Vinayak Mehta <vmehta94@gmail.com>
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# Copyright 2010-2018 by Hartmut Goebel <h.goebel@crazy-compilers.com>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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from . import _gsprint as gs
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__author__ = "Hartmut Goebel <h.goebel@crazy-compilers.com>"
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__copyright__ = "Copyright 2010-2018 by Hartmut Goebel <h.goebel@crazy-compilers.com>"
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__license__ = "GNU General Public License version 3 (GPL v3)"
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__version__ = "0.6"
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class __Ghostscript(object):
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def __init__(self, instance, args, stdin=None, stdout=None, stderr=None):
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self._initialized = False
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self._callbacks = None
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if stdin or stdout or stderr:
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self.set_stdio(stdin, stdout, stderr)
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rc = gs.init_with_args(instance, args)
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self._initialized = True
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if rc == gs.e_Quit:
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self.exit()
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def __enter__(self):
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return self
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def __exit__(self, *args):
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self.exit()
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def set_stdio(self, stdin=None, stdout=None, stderr=None):
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"""Set stdin, stdout and stderr of the ghostscript interpreter.
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The ``stdin`` stream has to support the ``readline()``
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interface. The ``stdout`` and ``stderr`` streams have to
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support the ``write()`` and ``flush()`` interface.
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Please note that this does not affect the input- and output-
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streams of the devices. Esp. setting stdout does not allow
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catching the devise-output even when using ``-sOutputFile=-``.
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"""
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global __instance__
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self._callbacks = (
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stdin and gs._wrap_stdin(stdin) or None,
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stdout and gs._wrap_stdout(stdout) or None,
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stderr and gs._wrap_stderr(stderr) or None,
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)
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gs.set_stdio(__instance__, *self._callbacks)
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def __del__(self):
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self.exit()
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def exit(self):
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global __instance__
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if self._initialized:
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if __instance__ is not None:
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gs.exit(__instance__)
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gs.delete_instance(__instance__)
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__instance__ = None
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self._initialized = False
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def Ghostscript(*args, **kwargs):
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"""Factory function for setting up a Ghostscript instance
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"""
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global __instance__
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# Ghostscript only supports a single instance
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if __instance__ is None:
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__instance__ = gs.new_instance()
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return __Ghostscript(
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__instance__,
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args,
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stdin=kwargs.get("stdin", None),
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stdout=kwargs.get("stdout", None),
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stderr=kwargs.get("stderr", None),
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)
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__instance__ = None
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