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==dxf import script ==

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script for DXF import by kitsu (Ed Blake) - provide superior import to our native DXF import for many files
This commit is contained in:
Tom Musgrove
2007-01-05 00:51:12 +00:00
parent 770e816cee
commit e586ec7bcd
4 changed files with 2936 additions and 0 deletions
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release/scripts/bpymodules/dxfReader.py Normal file
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"""This module provides a function for reading dxf files and parsing them into a useful tree of objects and data.
The convert function is called by the readDXF fuction to convert dxf strings into the correct data based
on their type code. readDXF expects a (full path) file name as input.
"""
# --------------------------------------------------------------------------
# DXF Reader v0.8 by Ed Blake (AKA Kitsu)
# --------------------------------------------------------------------------
# ***** BEGIN GPL LICENSE BLOCK *****
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software Foundation,
# Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#
# ***** END GPL LICENCE BLOCK *****
# --------------------------------------------------------------------------
from dxfImportObjects import *
class InitializationError(Exception): pass
class StateMachine:
"""(finite) State Machine from the great David Mertz's great Charming Python article."""
def __init__(self):
self.handlers = []
self.startState = None
self.endStates = []
def add_state(self, handler, end_state=0):
"""All states and handlers are functions which return
a state and a cargo."""
self.handlers.append(handler)
if end_state:
self.endStates.append(handler)
def set_start(self, handler):
"""Sets the starting handler function."""
self.startState = handler
def run(self, cargo=None):
if not self.startState:
raise InitializationError,\
"must call .set_start() before .run()"
if not self.endStates:
raise InitializationError, \
"at least one state must be an end_state"
handler = self.startState
while 1:
(newState, cargo) = handler(cargo)
#print cargo
if newState in self.endStates:
return newState(cargo)
#break
elif newState not in self.handlers:
raise RuntimeError, "Invalid target %s" % newState
else:
handler = newState
def convert(code, value):
"""Convert a string to the correct Python type based on its dxf code.
code types:
ints = 60-79, 170-179, 270-289, 370-389, 400-409, 1060-1070
longs = 90-99, 420-429, 440-459, 1071
floats = 10-39, 40-59, 110-139, 140-149, 210-239, 460-469, 1010-1059
hex = 105, 310-379, 390-399
strings = 0-9, 100, 102, 300-309, 410-419, 430-439, 470-479, 999, 1000-1009
"""
if 59 < code < 80 or 169 < code < 180 or 269 < code < 290 or 369 < code < 390 or 399 < code < 410 or 1059 < code < 1071:
value = int(value)
elif 89 < code < 100 or 419 < code < 430 or 439 < code < 460 or code == 1071:
value = long(value)
elif 9 < code < 60 or 109 < code < 150 or 209 < code < 240 or 459 < code < 470 or 1009 < code < 1060:
value = float(value)
elif code == 105 or 309 < code < 380 or 389 < code < 400:
value = int(value, 16) # should be left as string?
else: # it's already a string so do nothing
pass
return value
def findObject(infile, kind=''):
"""Finds the next occurance of an object."""
obj = False
while 1:
line = infile.readline()
if not line: # readline returns '' at eof
return False
if not obj: # We're still looking for our object code
if line.lower().strip() == '0':
obj = True # found it
else: # we are in an object definition
if kind: # if we're looking for a particular kind
if line.lower().strip() == kind:
obj = Object(line.lower().strip())
break
else: # otherwise take anything non-numeric
if line.lower().strip() not in string.digits:
obj = Object(line.lower().strip())
break
obj = False # whether we found one or not it's time to start over
return obj
def handleObject(infile):
"""Add data to an object until end of object is found."""
line = infile.readline()
if line.lower().strip() == 'section':
return 'section' # this would be a problem
elif line.lower().strip() == 'endsec':
return 'endsec' # this means we are done with a section
else: # add data to the object until we find a new object
obj = Object(line.lower().strip())
obj.name = obj.type
done = False
data = []
while not done:
line = infile.readline()
if not data:
if line.lower().strip() == '0':
#we've found an object, time to return
return obj
else:
# first part is always an int
data.append(int(line.lower().strip()))
else:
data.append(convert(data[0], line.strip()))
obj.data.append(data)
data = []
def handleTable(table, infile):
"""Special handler for dealing with nested table objects."""
item, name = get_name(table.data)
if name: # We should always find a name
table.data.remove(item)
table.name = name.lower()
# This next bit is from handleObject
# handleObject should be generalized to work with any section like object
while 1:
obj = handleObject(infile)
if obj.type == 'table':
print "Warning: previous table not closed!"
return table
elif obj.type == 'endtab':
return table # this means we are done with the table
else: # add objects to the table until one of the above is found
table.data.append(obj)
def handleBlock(block, infile):
"""Special handler for dealing with nested table objects."""
item, name = get_name(block.data)
if name: # We should always find a name
block.data.remove(item)
block.name = name.lower()
# This next bit is from handleObject
# handleObject should be generalized to work with any section like object
while 1:
obj = handleObject(infile)
if obj.type == 'block':
print "Warning: previous block not closed!"
return block
elif obj.type == 'endblk':
return block # this means we are done with the table
else: # add objects to the table until one of the above is found
block.data.append(obj)
"""These are the states/functions used in the State Machine.
states:
start - find first section
start_section - add data, find first object
object - add obj-data, watch for next obj (called directly by start_section)
end_section - look for next section or eof
end - return results
"""
def start(cargo):
"""Expects the infile as cargo, initializes the cargo."""
#print "Entering start state!"
infile = cargo
drawing = Object('drawing')
section = findObject(infile, 'section')
if section:
return start_section, (infile, drawing, section)
else:
return error, (infile, "Failed to find any sections!")
def start_section(cargo):
"""Expects [infile, drawing, section] as cargo, builds a nested section object."""
#print "Entering start_section state!"
infile = cargo[0]
drawing = cargo[1]
section = cargo[2]
# read each line, if it is an object declaration go to object mode
# otherwise create a [index, data] pair and add it to the sections data.
done = False
data = []
while not done:
line = infile.readline()
if not data: # if we haven't found a dxf code yet
if line.lower().strip() == '0':
# we've found an object
while 1: # no way out unless we find an end section or a new section
obj = handleObject(infile)
if obj == 'section': # shouldn't happen
print "Warning: failed to close previous section!"
return end_section, (infile, drawing)
elif obj == 'endsec': # This section is over, look for the next
drawing.data.append(section)
return end_section, (infile, drawing)
elif obj.type == 'table': # tables are collections of data
obj = handleTable(obj, infile) # we need to find all there contents
section.data.append(obj) # before moving on
elif obj.type == 'block': # the same is true of blocks
obj = handleBlock(obj, infile) # we need to find all there contents
section.data.append(obj) # before moving on
else: # found another sub-object
section.data.append(obj)
else:
data.append(int(line.lower().strip()))
else: # we have our code, now we just need to convert the data and add it to our list.
data.append(convert(data[0], line.strip()))
section.data.append(data)
data = []
def end_section(cargo):
"""Expects (infile, drawing) as cargo, searches for next section."""
#print "Entering end_section state!"
infile = cargo[0]
drawing = cargo[1]
section = findObject(infile, 'section')
if section:
return start_section, (infile, drawing, section)
else:
return end, (infile, drawing)
def end(cargo):
"""Expects (infile, drawing) as cargo, called when eof has been reached."""
#print "Entering end state!"
infile = cargo[0]
drawing = cargo[1]
#infile.close()
return drawing
def error(cargo):
"""Expects a (infile, string) as cargo, called when there is an error during processing."""
#print "Entering error state!"
infile = cargo[0]
err = cargo[1]
infile.close()
print "There has been an error:"
print err
return False
def readDXF(filename):
"""Given a file name try to read it as a dxf file.
Output is an object with the following structure
drawing
header
header data
classes
class data
tables
table data
blocks
block data
entities
entity data
objects
object data
where foo data is a list of sub-objects. True object data
is of the form [code, data].
"""
infile = open(filename)
sm = StateMachine()
sm.add_state(error, True)
sm.add_state(end, True)
sm.add_state(start_section)
sm.add_state(end_section)
sm.add_state(start)
sm.set_start(start)
try:
drawing = sm.run(infile)
if drawing:
drawing.name = filename
for obj in drawing.data:
item, name = get_name(obj.data)
if name:
obj.data.remove(item)
obj.name = name.lower()
setattr(drawing, name.lower(), obj)
# Call the objectify function from dxfImportObjects to cast
# raw objects into the right types of object
obj.data = objectify(obj.data)
#print obj.name
finally:
infile.close()
return drawing
if __name__ == "__main__":
filename = r".\examples\block-test.dxf"
drawing = readDXF(filename)
for item in drawing.entities.data:
print item