mercurial/revlogutils/flagutil.py
author Pierre-Yves David <pierre-yves.david@octobus.net>
Thu, 08 Aug 2019 01:25:37 +0200
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permissions -rw-r--r--
flagutil: move insertflagprocessor to the new module (API)
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# flagutils.py - code to deal with revlog flags and their processors
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#
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# Copyright 2016 Remi Chaintron <remi@fb.com>
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# Copyright 2016-2019 Pierre-Yves David <pierre-yves.david@ens-lyon.org>
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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from __future__ import absolute_import
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from ..i18n import _
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from .constants import (
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    REVIDX_DEFAULT_FLAGS,
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    REVIDX_ELLIPSIS,
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    REVIDX_EXTSTORED,
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    REVIDX_FLAGS_ORDER,
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    REVIDX_ISCENSORED,
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    REVIDX_RAWTEXT_CHANGING_FLAGS,
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)
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from .. import (
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    error,
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    util
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)
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# blanked usage of all the name to prevent pyflakes constraints
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# We need these name available in the module for extensions.
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REVIDX_ISCENSORED
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REVIDX_ELLIPSIS
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REVIDX_EXTSTORED
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REVIDX_DEFAULT_FLAGS
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REVIDX_FLAGS_ORDER
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REVIDX_RAWTEXT_CHANGING_FLAGS
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REVIDX_KNOWN_FLAGS = util.bitsfrom(REVIDX_FLAGS_ORDER)
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# Store flag processors (cf. 'addflagprocessor()' to register)
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flagprocessors = {
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    REVIDX_ISCENSORED: None,
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}
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def insertflagprocessor(flag, processor, flagprocessors):
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    if not flag & REVIDX_KNOWN_FLAGS:
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        msg = _("cannot register processor on unknown flag '%#x'.") % (flag)
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        raise error.ProgrammingError(msg)
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    if flag not in REVIDX_FLAGS_ORDER:
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        msg = _("flag '%#x' undefined in REVIDX_FLAGS_ORDER.") % (flag)
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        raise error.ProgrammingError(msg)
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    if flag in flagprocessors:
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        msg = _("cannot register multiple processors on flag '%#x'.") % (flag)
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        raise error.Abort(msg)
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    flagprocessors[flag] = processor