Improve performance of Remove Empty Groups extension. Thanks to Cyrille

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Mario Voigt 2022-04-18 19:44:50 +02:00
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@ -5,32 +5,40 @@ import inkex
"""
Extension for InkScape 1.0
This extension is totally minimal. It will just clean the whole document from groups without content (dangling groups). That usually happens if you have a group but remove it's paths for example. The group will possibly stay in the XML tree. This also applies for layers because layers are just special types of groups. This effect applies to the whole document ONLY!
This extension is totally minimal. It will just clean the whole document from groups without content (dangling groups). That usually happens if you have a group but remove its paths for example. The group will possibly stay in the XML tree. This also applies for layers because layers are just special types of groups. This effect applies to the whole document ONLY!
Author: Mario Voigt / FabLab Chemnitz
Mail: mario.voigt@stadtfabrikanten.org
Date: 19.08.2020
Last Patch: 01.04.2021
Last Patch: 18.04.2022
License: GNU GPL v3
Thanks to Cyrille
"""
class RemoveEmptyGroups(inkex.EffectExtension):
def effect(self):
while True:
groups = self.document.xpath('//svg:g',namespaces=inkex.NSS)
oldLen = len(groups)
#leave the loop if there are no groups at all
if len(groups) == 0:
break
#loop trough groups. we have minimum of one to check for emptyness
for group in groups:
if len(group.getchildren()) == 0 and group.getparent() is not None:
group.getparent().remove(group) #deletes the deepest empty group
continue #we found minimum of one element to delete. so we should run another cycle to check if the parent of this group is empty after deletion
newLen = len(self.document.xpath('//svg:g',namespaces=inkex.NSS))
if newLen == oldLen: #found no more empty groups. Leaving the loop
break
if __name__ == '__main__':
# gets all group elements in document, at any/all nested levels
groups = self.document.xpath('//svg:g',namespaces=inkex.NSS)
# end if there are no groups
if len(groups) == 0:
return
# used to track if we make changes
made_changes = False
# loop through groups
for group in groups:
# checks if item is empty leaf, and if so prune up branch
while len(group.getchildren()) == 0:
# this group is empty, delete it
parent = group.getparent()
parent.remove(group)
# see if we should delete the parent too, recursively
group = parent
if __name__ == '__main__':
RemoveEmptyGroups().run()