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vector_layer_split.py 3.94 KiB
#!/usr/bin/env python3
'''
Application for splitting groups from one SVG file into separate files
Usage:
python3 vector_layer_split.py infile format outdir
Usage Example:
python3 vector_layer_split.py vector_source.svg tw ../src/art/vector/layers/
'''
import lxml.etree as etree
import sys
import os
import copy
import re
import normalize_svg
input_file = sys.argv[1]
output_format = sys.argv[2]
output_directory = sys.argv[3]
if not os.path.exists(output_directory):
os.makedirs(output_directory)
ns = {
'svg' : 'http://www.w3.org/2000/svg',
'inkscape' : 'http://www.inkscape.org/namespaces/inkscape',
'sodipodi':"http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd",
}
tree = etree.parse(input_file)
normalize_svg.fix(tree)
# prepare output template
template = copy.deepcopy(tree)
root = template.getroot()
# remove all svg root attributes except document size
for a in root.attrib:
if (a != "viewBox"):
del root.attrib[a]
# add placeholder for CSS class (needed for workaround for non HTML 5.1 compliant browser)
if output_format == 'tw':
root.attrib["class"] = "'+_art_display_class+'"
# remove all content, including metadata
# for twine output, style definitions are removed, too
defs = None
for e in root:
if (e.tag == etree.QName(ns['svg'], 'defs')):
defs = e
if (e.tag == etree.QName(ns['svg'], 'g') or
e.tag == etree.QName(ns['svg'], 'metadata') or
e.tag == etree.QName(ns['svg'], 'defs') or
e.tag == etree.QName(ns['sodipodi'], 'namedview') or
(output_format == 'tw' and e.tag == etree.QName(ns['svg'], 'style'))
):
root.remove(e)
# template preparation finished
# prepare regex for later use
regex_xmlns = re.compile(' xmlns[^ ]+',)
regex_space = re.compile('[>][ ]+[<]',)
# find all groups
layers = tree.xpath('//svg:g',namespaces=ns)
for layer in layers:
i = layer.get('id')
if ( # disregard non-content groups
i.endswith("_") or # manually suppressed with underscore
i.startswith("XMLID") or # Illustrator generated group
i.startswith("g") # Inkscape generated group
):
continue
# create new canvas
output = copy.deepcopy(template)
# copy all shapes into template
canvas = output.getroot()
for e in layer:
canvas.append(e)
# represent template as SVG (binary string)
svg = etree.tostring(output, pretty_print=False)
# poor man's conditional defs insertion
# TODO: extract only referenced defs (filters, gradients, ...)
# TODO: detect necessity by traversing the elements. do not stupidly search in the string representation
if ("filter:" in svg.decode('utf-8')):
# it seems there is a filter referenced in the generated SVG, re-insert defs from main document
canvas.insert(0,defs)
# re-generate output
svg = etree.tostring(output, pretty_print=False)
if (output_format == 'tw'):
# remove unnecessary attributes
# TODO: never generate unnecessary attributes in the first place
svg = svg.decode('utf-8')
svg = regex_xmlns.sub('',svg)
svg = svg.replace(' inkscape:connector-curvature="0"','') # this just saves space
svg = svg.replace('\n','').replace('\r','') # print cannot be multi-line
svg = regex_space.sub('><',svg) # remove indentaion
svg = svg.replace('svg:','') # svg namespace was removed
svg = svg.replace('<g ','<g transform="\'+_art_transform+\'"') # internal groups are used for scaling
svg = svg.encode('utf-8')
# save SVG string to file
i = layer.get('id')
output_path = os.path.join(output_directory,i+'.'+output_format)
with open(output_path, 'wb') as f:
if (output_format == 'svg'):
# Header for normal SVG (XML)
f.write('<?xml version="1.0" encoding="UTF-8" standalone="no"?>\n'.encode("utf-8"))
f.write(svg)
elif (output_format == 'tw'):
# Header for SVG in Twine file (SugarCube print statement)
f.write((':: Art_Vector_%s [nobr]\n\n'%(i)).encode("utf-8"))
f.write("<<print '<html>".encode("utf-8"))
f.write(svg)
f.write("</html>' >>".encode("utf-8"))