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Precompile optimizations REs and fix performance issue

This commit is contained in:
Florian Festi 2019-08-22 00:31:45 +02:00
parent 39bd912c90
commit 9a17e3efa9
1 changed files with 17 additions and 15 deletions
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32
boxes/svgutil.py
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@ -169,27 +169,29 @@ class SVGFile(object):
self.tree.write(self.filename) self.tree.write(self.filename)
d = r"(\-?\d+(\.\d+)?)"
optimize_patterns = [
(re.compile(" " + d + " " + d + r" (M|L) \1 \3 "),
r" \1 \3 "), # remove useless moves
# compress L parts of paths into V and H
(re.compile(" " + d + " " + d + r" L " + d + r" \3 "),
r" \1 \3 H \5 "),
(re.compile(" " + d + " " + d + r" L \1 " + d + " "),
r" \1 \3 V \5 "),
(re.compile(r"H " + d + r" L \1 " + d + " "),
r"H \1 V \3 "),
(re.compile(r"V " + d + " L " + d + " \1 "),
r"V \1 H \3 "),
]
def optimize(self, element): def optimize(self, element):
number = 0 number = 0
if element.tag.endswith("}path"): if element.tag.endswith("}path"):
path = element.attrib.get("d", "") path = element.attrib.get("d", "")
d = r"(\-?\d+(\.\d+)?)"
while True: while True:
old_number = number old_number = number
for pattern, replacement in ( for pattern, replacement in self.optimize_patterns:
(" " + d + " " + d + r" (M|L) \1 \3 ", path, n = pattern.subn(replacement, path)
r" \1 \3 "), # remove useless moves
# compress L parts of paths into V and H
(" " + d + " " + d + r" L " + d + r" \3 ",
r" \1 \3 H \5 "),
(" " + d + " " + d + r" L \1 " + d + " ",
r" \1 \3 V \5 "),
(r"H " + d + r" L \1 " + d + " ",
r"H \1 V \3 "),
(r"V " + d + " L " + d + " \1 ",
r"V \1 H \3 "),
):
path, n = re.subn(pattern, replacement, path, 2)
number += n number += n
if number == old_number: if number == old_number:
break break