Minifier
This commit is contained in:
Ruud
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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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