2020-01-06 07:21:52 -05:00

52 lines
1.7 KiB
Python

import re
def cssmin(path):
with open(path, "r") as f:
css = f.read()
# remove comments - this will break a lot of hacks :-P
css = re.sub(r"\s*/\*\s*\*/", "$$HACK1$$", css) # preserve IE<6 comment hack
css = re.sub(r"/\*[\s\S]*?\*/", "", css)
css = css.replace("$$HACK1$$", "/**/") # preserve IE<6 comment hack
# url() doesn't need quotes
css = re.sub(r'url\((["\'])([^)]*)\1\)', r"url(\2)", css)
# spaces may be safely collapsed as generated content will collapse them anyway
css = re.sub(r"\s+", " ", css)
# shorten collapsable colors: #aabbcc to #abc
css = re.sub(r"#([0-9a-f])\1([0-9a-f])\2([0-9a-f])\3(\s|;)", r"#\1\2\3\4", css)
# fragment values can loose zeros
css = re.sub(r":\s*0(\.\d+([cm]m|e[mx]|in|p[ctx]))\s*;", r":\1;", css)
return_string = ""
for rule in re.findall(r"([^{]+){([^}]*)}", css):
# we don't need spaces around operators
selectors = [
re.sub(r"(?<=[\[\(>+=])\s+|\s+(?=[=~^$*|>+\]\)])", r"", selector.strip())
for selector in rule[0].split(",")
]
# order is important, but we still want to discard repetitions
properties = {}
porder = []
for prop in re.findall("(.*?):(.*?)(;|$)", rule[1]):
key = prop[0].strip().lower()
if key not in porder:
porder.append(key)
properties[key] = prop[1].strip()
# output rule if it contains any declarations
if properties:
return_string += "%s{%s}" % (
",".join(selectors),
"".join(["%s:%s;" % (key, properties[key]) for key in porder])[:-1],
)
return return_string