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140 lines
5.0 KiB
Python
140 lines
5.0 KiB
Python
# -*- coding: utf-8 -*-
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#
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# Copyright © 2010 Eugeniy Meshcheryakov <eugen@debian.org>
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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 Lesser 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,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser 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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:mod:`gdsii.library` --- interface to a GDSII library
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=====================================================
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This module contains class that represents a GDSII library.
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.. moduleauthor:: Eugeniy Meshcheryakov <eugen@debian.org>
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"""
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from __future__ import absolute_import
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from . import exceptions, record, structure, tags, _records
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from datetime import datetime
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_HEADER = _records.SimpleRecord('version', tags.HEADER)
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_BGNLIB = _records.TimestampsRecord('mod_time', 'acc_time', tags.BGNLIB)
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_LIBDIRSIZE = _records.SimpleOptionalRecord('libdirsize', tags.LIBDIRSIZE)
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_SRFNAME = _records.OptionalWholeRecord('srfname', tags.SRFNAME)
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_LIBSECUR = _records.ACLRecord('acls', tags.LIBSECUR)
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_LIBNAME = _records.StringRecord('name', tags.LIBNAME)
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_REFLIBS = _records.OptionalWholeRecord('reflibs', tags.REFLIBS)
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_FONTS = _records.OptionalWholeRecord('fonts', tags.FONTS)
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_ATTRTABLE = _records.OptionalWholeRecord('attrtable', tags.ATTRTABLE)
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_GENERATIONS = _records.SimpleOptionalRecord('generations', tags.GENERATIONS)
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_FORMAT = _records.FormatRecord('format', 'masks', tags.FORMAT)
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_UNITS = _records.UnitsRecord('logical_unit', 'physical_unit', tags.UNITS)
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class Library(list):
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"""
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GDSII library class. This class is derived from :class:`list` and can contain
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one one more instances of :class:`gdsii.structure.Structure`.
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GDS syntax for the library:
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.. productionlist::
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library: HEADER
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: BGNLIB
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: [LIBDIRSIZE]
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: [SRFNAME]
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: [LIBSECUR]
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: LIBNAME
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: [REFLIBS]
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: [FONTS]
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: [ATTRTABLE]
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: [GENERATIONS]
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: [`format`]
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: UNITS
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: {`structure`}*
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: ENDLIB
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format: FORMAT
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: [MASK+ ENDMASKS]
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"""
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_gds_objs = (_HEADER, _BGNLIB, _LIBDIRSIZE, _SRFNAME, _LIBSECUR, _LIBNAME, _REFLIBS,
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_FONTS, _ATTRTABLE, _GENERATIONS, _FORMAT, _UNITS)
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def __init__(self, version, name, physical_unit, logical_unit, mod_time=None,
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acc_time=None):
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"""
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Initialize the library.
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`mod_time` and `acc_time` are set to current UTC time by default.
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"""
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list.__init__(self)
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self.version = version
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self.name = name
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self.physical_unit = physical_unit
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self.logical_unit = logical_unit
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self.mod_time = mod_time if mod_time is not None else datetime.utcnow()
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self.acc_time = acc_time if acc_time is not None else datetime.utcnow()
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self._init_optional()
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def _init_optional(self):
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"""Initialize optional attributes to None."""
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self.libdirsize = None
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self.srfname = None
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self.acls = None
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self.reflibs = None
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self.fonts = None
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self.attrtable = None
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self.generations = None
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self.format = None
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self.masks = None
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@classmethod
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def load(cls, stream):
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"""
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Load a GDS library from a file.
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:param stream: a :class:`file` or file-like object opened for reading in binary mode.
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:returns: a new library.
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"""
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self = cls.__new__(cls)
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list.__init__(self)
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self._init_optional()
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gen = record.Reader(stream)
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gen.read_next()
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for obj in self._gds_objs:
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obj.read(self, gen)
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# read structures starting with BGNSTR or ENDLIB
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rec = gen.current
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while True:
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if rec.tag == tags.BGNSTR:
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self.append(structure.Structure._load(gen))
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rec = gen.read_next()
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elif rec.tag == tags.ENDLIB:
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break
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else:
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raise exceptions.FormatError('unexpected tag where BGNSTR or ENDLIB are expected: %d', rec.tag)
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return self
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def save(self, stream):
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"""
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Save the library into a file.
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:param stream: a :class:`file` or file-like object opened for writing in binary mode.
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"""
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for obj in self._gds_objs:
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obj.save(self, stream)
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for struc in self:
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struc._save(stream)
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record.Record(tags.ENDLIB).save(stream)
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def __repr__(self):
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return '<Library: %s>' % self.name.decode()
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