Ruud
12 years ago
10 changed files with 1237 additions and 703 deletions
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#!/usr/bin/env python |
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# -*- coding: utf-8 -*- |
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# `cssmin.py` - A Python port of the YUI CSS compressor. |
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from StringIO import StringIO # The pure-Python StringIO supports unicode. |
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import re |
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__version__ = '0.1.1' |
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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 = 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(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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@ -0,0 +1,218 @@ |
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#!/usr/bin/python |
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# This code is original from jsmin by Douglas Crockford, it was translated to |
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# Python by Baruch Even. The original code had the following copyright and |
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# license. |
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# |
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# /* jsmin.c |
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# 2007-05-22 |
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# |
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# Copyright (c) 2002 Douglas Crockford (www.crockford.com) |
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# |
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# Permission is hereby granted, free of charge, to any person obtaining a copy of |
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# this software and associated documentation files (the "Software"), to deal in |
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# the Software without restriction, including without limitation the rights to |
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# use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies |
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# of the Software, and to permit persons to whom the Software is furnished to do |
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# so, subject to the following conditions: |
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# |
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# The above copyright notice and this permission notice shall be included in all |
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# copies or substantial portions of the Software. |
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# |
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# The Software shall be used for Good, not Evil. |
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# |
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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# SOFTWARE. |
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# */ |
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from StringIO import StringIO |
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def jsmin(js): |
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ins = StringIO(js) |
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outs = StringIO() |
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JavascriptMinify().minify(ins, outs) |
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str = outs.getvalue() |
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if len(str) > 0 and str[0] == '\n': |
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str = str[1:] |
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return str |
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def isAlphanum(c): |
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"""return true if the character is a letter, digit, underscore, |
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dollar sign, or non-ASCII character. |
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""" |
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return ((c >= 'a' and c <= 'z') or (c >= '0' and c <= '9') or |
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(c >= 'A' and c <= 'Z') or c == '_' or c == '$' or c == '\\' or (c is not None and ord(c) > 126)); |
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class UnterminatedComment(Exception): |
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pass |
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class UnterminatedStringLiteral(Exception): |
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pass |
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class UnterminatedRegularExpression(Exception): |
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pass |
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class JavascriptMinify(object): |
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def _outA(self): |
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self.outstream.write(self.theA) |
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def _outB(self): |
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self.outstream.write(self.theB) |
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def _get(self): |
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"""return the next character from stdin. Watch out for lookahead. If |
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the character is a control character, translate it to a space or |
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linefeed. |
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""" |
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c = self.theLookahead |
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self.theLookahead = None |
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if c == None: |
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c = self.instream.read(1) |
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if c >= ' ' or c == '\n': |
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return c |
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if c == '': # EOF |
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return '\000' |
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if c == '\r': |
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return '\n' |
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return ' ' |
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def _peek(self): |
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self.theLookahead = self._get() |
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return self.theLookahead |
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def _next(self): |
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"""get the next character, excluding comments. peek() is used to see |
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if a '/' is followed by a '/' or '*'. |
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""" |
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c = self._get() |
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if c == '/': |
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p = self._peek() |
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if p == '/': |
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c = self._get() |
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while c > '\n': |
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c = self._get() |
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return c |
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if p == '*': |
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c = self._get() |
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while 1: |
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c = self._get() |
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if c == '*': |
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if self._peek() == '/': |
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self._get() |
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return ' ' |
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if c == '\000': |
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raise UnterminatedComment() |
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return c |
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def _action(self, action): |
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"""do something! What you do is determined by the argument: |
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1 Output A. Copy B to A. Get the next B. |
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2 Copy B to A. Get the next B. (Delete A). |
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3 Get the next B. (Delete B). |
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action treats a string as a single character. Wow! |
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action recognizes a regular expression if it is preceded by ( or , or =. |
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""" |
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if action <= 1: |
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self._outA() |
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if action <= 2: |
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self.theA = self.theB |
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if self.theA == "'" or self.theA == '"': |
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while 1: |
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self._outA() |
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self.theA = self._get() |
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if self.theA == self.theB: |
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break |
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if self.theA <= '\n': |
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raise UnterminatedStringLiteral() |
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if self.theA == '\\': |
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self._outA() |
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self.theA = self._get() |
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if action <= 3: |
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self.theB = self._next() |
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if self.theB == '/' and (self.theA == '(' or self.theA == ',' or |
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self.theA == '=' or self.theA == ':' or |
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self.theA == '[' or self.theA == '?' or |
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self.theA == '!' or self.theA == '&' or |
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self.theA == '|' or self.theA == ';' or |
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self.theA == '{' or self.theA == '}' or |
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self.theA == '\n'): |
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self._outA() |
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self._outB() |
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while 1: |
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self.theA = self._get() |
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if self.theA == '/': |
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break |
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elif self.theA == '\\': |
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self._outA() |
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self.theA = self._get() |
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elif self.theA <= '\n': |
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raise UnterminatedRegularExpression() |
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self._outA() |
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self.theB = self._next() |
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def _jsmin(self): |
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"""Copy the input to the output, deleting the characters which are |
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insignificant to JavaScript. Comments will be removed. Tabs will be |
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replaced with spaces. Carriage returns will be replaced with linefeeds. |
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Most spaces and linefeeds will be removed. |
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""" |
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self.theA = '\n' |
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self._action(3) |
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while self.theA != '\000': |
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if self.theA == ' ': |
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if isAlphanum(self.theB): |
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self._action(1) |
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else: |
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self._action(2) |
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elif self.theA == '\n': |
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if self.theB in ['{', '[', '(', '+', '-']: |
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self._action(1) |
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elif self.theB == ' ': |
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self._action(3) |
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else: |
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if isAlphanum(self.theB): |
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self._action(1) |
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else: |
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self._action(2) |
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else: |
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if self.theB == ' ': |
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if isAlphanum(self.theA): |
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self._action(1) |
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else: |
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self._action(3) |
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elif self.theB == '\n': |
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if self.theA in ['}', ']', ')', '+', '-', '"', '\'']: |
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self._action(1) |
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else: |
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if isAlphanum(self.theA): |
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self._action(1) |
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else: |
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self._action(3) |
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else: |
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self._action(1) |
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def minify(self, instream, outstream): |
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self.instream = instream |
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self.outstream = outstream |
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self.theA = '\n' |
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self.theB = None |
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self.theLookahead = None |
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self._jsmin() |
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self.instream.close() |
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if __name__ == '__main__': |
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import sys |
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jsm = JavascriptMinify() |
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jsm.minify(sys.stdin, sys.stdout) |
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Reference in new issue