235 lines
6.8 KiB
Python
235 lines
6.8 KiB
Python
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#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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"""`cssmin` - A Python port of the YUI CSS compressor."""
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"""
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Home page: https://github.com/zacharyvoase/cssmin
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License: BSD: https://github.com/zacharyvoase/cssmin/blob/master/LICENSE
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Original author: Zachary Voase
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Modified for inclusion into web2py by: Ross Peoples <ross.peoples@gmail.com>
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"""
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try:
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from StringIO import StringIO
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except ImportError:
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from io import StringIO
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import re
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__version__ = '0.1.4'
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def remove_comments(css):
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"""Remove all CSS comment blocks."""
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iemac = False
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preserve = False
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comment_start = css.find("/*")
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while comment_start >= 0:
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# Preserve comments that look like `/*!...*/`.
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# Slicing is used to make sure we don"t get an IndexError.
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preserve = css[comment_start + 2:comment_start + 3] == "!"
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comment_end = css.find("*/", comment_start + 2)
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if comment_end < 0:
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if not preserve:
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css = css[:comment_start]
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break
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elif comment_end >= (comment_start + 2):
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if css[comment_end - 1] == "\\":
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# This is an IE Mac-specific comment; leave this one and the
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# following one alone.
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comment_start = comment_end + 2
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iemac = True
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elif iemac:
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comment_start = comment_end + 2
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iemac = False
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elif not preserve:
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css = css[:comment_start] + css[comment_end + 2:]
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else:
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comment_start = comment_end + 2
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comment_start = css.find("/*", comment_start)
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return css
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def remove_unnecessary_whitespace(css):
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"""Remove unnecessary whitespace characters."""
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def pseudoclasscolon(css):
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"""
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Prevents 'p :link' from becoming 'p:link'.
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Translates 'p :link' into 'p ___PSEUDOCLASSCOLON___link'; this is
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translated back again later.
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"""
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regex = re.compile(r"(^|\})(([^\{\:])+\:)+([^\{]*\{)")
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match = regex.search(css)
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while match:
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css = ''.join([
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css[:match.start()],
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match.group().replace(":", "___PSEUDOCLASSCOLON___"),
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css[match.end():]])
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match = regex.search(css)
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return css
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css = pseudoclasscolon(css)
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# Remove spaces from before things.
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css = re.sub(r"\s+([!{};:>+\(\)\],])", r"\1", css)
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# If there is a `@charset`, then only allow one, and move to the beginning.
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css = re.sub(r"^(.*)(@charset \"[^\"]*\";)", r"\2\1", css)
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css = re.sub(r"^(\s*@charset [^;]+;\s*)+", r"\1", css)
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# Put the space back in for a few cases, such as `@media screen` and
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# `(-webkit-min-device-pixel-ratio:0)`.
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css = re.sub(r"\band\(", "and (", css)
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# Put the colons back.
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css = css.replace('___PSEUDOCLASSCOLON___', ':')
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# Remove spaces from after things.
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css = re.sub(r"([!{}:;>+\(\[,])\s+", r"\1", css)
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return css
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def remove_unnecessary_semicolons(css):
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"""Remove unnecessary semicolons."""
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return re.sub(r";+\}", "}", css)
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def remove_empty_rules(css):
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"""Remove empty rules."""
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return re.sub(r"[^\}\{]+\{\}", "", css)
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def normalize_rgb_colors_to_hex(css):
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"""Convert `rgb(51,102,153)` to `#336699`."""
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regex = re.compile(r"rgb\s*\(\s*([0-9,\s]+)\s*\)")
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match = regex.search(css)
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while match:
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colors = map(lambda s: s.strip(), match.group(1).split(","))
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hexcolor = '#%.2x%.2x%.2x' % tuple(map(int, colors))
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css = css.replace(match.group(), hexcolor)
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match = regex.search(css)
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return css
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def condense_zero_units(css):
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"""Replace `0(px, em, %, etc)` with `0`."""
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return re.sub(r"([\s:])(0)(px|em|%|in|cm|mm|pc|pt|ex)", r"\1\2", css)
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def condense_multidimensional_zeros(css):
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"""Replace `:0 0 0 0;`, `:0 0 0;` etc. with `:0;`."""
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css = css.replace(":0 0 0 0;", ":0;")
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css = css.replace(":0 0 0;", ":0;")
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css = css.replace(":0 0;", ":0;")
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# Revert `background-position:0;` to the valid `background-position:0 0;`.
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css = css.replace("background-position:0;", "background-position:0 0;")
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return css
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def condense_floating_points(css):
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"""Replace `0.6` with `.6` where possible."""
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return re.sub(r"(:|\s)0+\.(\d+)", r"\1.\2", css)
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def condense_hex_colors(css):
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"""Shorten colors from #AABBCC to #ABC where possible."""
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regex = re.compile(r"([^\"'=\s])(\s*)#([0-9a-fA-F])([0-9a-fA-F])([0-9a-fA-F])([0-9a-fA-F])([0-9a-fA-F])([0-9a-fA-F])")
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match = regex.search(css)
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while match:
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first = match.group(3) + match.group(5) + match.group(7)
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second = match.group(4) + match.group(6) + match.group(8)
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if first.lower() == second.lower():
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css = css.replace(
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match.group(), match.group(1) + match.group(2) + '#' + first)
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match = regex.search(css, match.end() - 3)
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else:
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match = regex.search(css, match.end())
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return css
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def condense_whitespace(css):
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"""Condense multiple adjacent whitespace characters into one."""
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return re.sub(r"\s+", " ", css)
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def condense_semicolons(css):
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"""Condense multiple adjacent semicolon characters into one."""
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return re.sub(r";;+", ";", css)
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def wrap_css_lines(css, line_length):
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"""Wrap the lines of the given CSS to an approximate length."""
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lines = []
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line_start = 0
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for i, char in enumerate(css):
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# It's safe to break after `}` characters.
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if char == '}' and (i - line_start >= line_length):
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lines.append(css[line_start:i + 1])
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line_start = i + 1
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if line_start < len(css):
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lines.append(css[line_start:])
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return '\n'.join(lines)
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def cssmin(css, wrap=None):
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css = remove_comments(css)
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css = condense_whitespace(css)
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# A pseudo class for the Box Model Hack
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# (see http://tantek.com/CSS/Examples/boxmodelhack.html)
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css = css.replace('"\\"}\\""', "___PSEUDOCLASSBMH___")
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css = remove_unnecessary_whitespace(css)
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css = remove_unnecessary_semicolons(css)
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css = condense_zero_units(css)
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css = condense_multidimensional_zeros(css)
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css = condense_floating_points(css)
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css = normalize_rgb_colors_to_hex(css)
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css = condense_hex_colors(css)
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if wrap is not None:
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css = wrap_css_lines(css, wrap)
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css = css.replace("___PSEUDOCLASSBMH___", '"\\"}\\""')
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css = condense_semicolons(css)
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return css.strip()
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def main():
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import optparse
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import sys
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p = optparse.OptionParser(
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prog="cssmin", version=__version__,
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usage="%prog [--wrap N]",
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description="""Reads raw CSS from stdin, and writes compressed CSS to stdout.""")
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p.add_option(
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'-w', '--wrap', type='int', default=None, metavar='N',
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help="Wrap output to approximately N chars per line.")
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options, args = p.parse_args()
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sys.stdout.write(cssmin(sys.stdin.read(), wrap=options.wrap))
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if __name__ == '__main__':
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main()
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