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# Purpose: generic tag wrapper
# Created: 21.07.2012, taken from my ezdxf project
# Copyright (C) 2012, Manfred Moitzi
# License: MIT License
from __future__ import unicode_literals
__author__ = "mozman <mozman@gmx.at>"
import os
from .const import ENV_CYTHON, XTYPE_NONE, XTYPE_2D, XTYPE_3D, XTYPE_2D_3D
cyDXFEntity = None
OPTIMIZE = True
if ENV_CYTHON in os.environ:
if os.environ[ENV_CYTHON].upper() in ('1', 'ON', 'TRUE'):
OPTIMIZE = True
else:
OPTIMIZE = False
try:
if OPTIMIZE:
from.cydxfentity import cyDXFEntity
except ImportError:
pass
class pyDXFEntity(object):
DXFATTRIBS = {}
def __init__(self, tags):
self.tags = tags
def dxftype(self):
return self.tags.noclass[0].value
def get_dxf_attrib(self, key, default=ValueError):
# core function - every optimization is useful
try:
dxfattr = self.DXFATTRIBS[key]
except KeyError:
# attribute is not defined - returning the default value is useful
# to query newer DXF attributes on older DXF files.
# !! Problem: misspelled attributes with default values do not
# raise an Exception !!
if default is ValueError:
raise ValueError("DXFAttrib '%s' is not defined." % key)
else:
return default
try:
return self._get_dxf_attrib(dxfattr)
except ValueError: # attribute is defined but no value is present
if default is ValueError:
raise ValueError("DXFAttrib '%s': value is not present." % key)
else:
return default
def _get_dxf_attrib(self, dxfattr):
# no subclass is subclass index 0
subclass_tags = self.tags.subclasses[dxfattr.subclass]
xtype = dxfattr.xtype
if xtype != XTYPE_NONE and xtype != XTYPE_2D_3D:
return self._get_extented_type(subclass_tags, dxfattr.code, xtype)
else:
return subclass_tags.get_value(dxfattr.code)
def paperspace(self):
return self.get_dxf_attrib('paperspace', default=0) == 1
def post_read_correction(self):
pass
@staticmethod
def _get_extented_type(tags, code, xtype):
value = tags.get_value(code)
if len(value) == 2:
if xtype == XTYPE_3D:
return value[0], value[1], 0.
elif xtype == XTYPE_2D:
return value[0], value[1]
return value
if cyDXFEntity is not None:
DXFEntity = cyDXFEntity
else:
DXFEntity = pyDXFEntity
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