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cssmin.py
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52 lines (47 loc) · 2.66 KB
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#!/usr/bin/env python
# Copyright (C) 2013 Apple Inc. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
# THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
# THE POSSIBILITY OF SUCH DAMAGE.
import re
def cssminify(css):
rules = (
(r"\/\*.*?\*\/", ""), # delete comments
(r"\n", ""), # delete new lines
(r"\s+", " "), # change multiple spaces to one space
(r"\s?([;{},~>!])\s?", r"\1"), # delete space where it is not needed
(r":\s", ":"), # delete spaces after colons, but not before. E.g. do not break selectors "a :focus", "b :matches(...)", "c :not(...)" where the leading space is significant
(r"\s?([-+])(?:\s(?![0-9(])(?!var))", r"\1"), # delete whitespace around + and - when not followed by a number, paren, or var(). E.g. strip for selector "a + b" but not "calc(a + b)" which requires spaces.
(r";}", "}") # change ';}' to '}' because the semicolon is not needed
)
css = css.replace("\r\n", "\n")
for rule in rules:
css = re.compile(rule[0], re.MULTILINE | re.UNICODE | re.DOTALL).sub(rule[1], css)
return css
if __name__ == "__main__":
import sys
if sys.version_info[0] >= 3:
import io
if sys.stdin.encoding != 'UTF-8':
sys.stdin = io.TextIOWrapper(sys.stdin.buffer, encoding='UTF-8')
if sys.stdout.encoding != 'UTF-8':
sys.stdout = io.TextIOWrapper(sys.stdout.buffer, encoding='UTF-8')
sys.stdout.write(cssminify(sys.stdin.read()))