/usr/share/gocode/src/github.com/dchest/cssmin/cssmin.go is in golang-github-dchest-cssmin-dev 0.0~git20151210.0.fb8d9b4-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 | // Go Port:
// Copyright (c) 2013 Dmitry Chestnykh <dmitry@codingrobots.com>
//
// Original:
// Copyright (c) 2008 Ryan Grove <ryan@wonko.com>
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * 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.
// * Neither the name of this project nor the names of its contributors may be
// used to endorse or promote products derived from this software without
// specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT OWNER OR 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.
// Package cssmin minifies CSS. It's a port of Ryan Grove's cssmin from Ruby.
package cssmin
import (
"bytes"
"fmt"
"regexp"
"strconv"
)
var (
rcomments = regexp.MustCompile(`\/\*[\s\S]*?\*\/`)
rwhitespace = regexp.MustCompile(`\s+`)
rbmh = regexp.MustCompile(`"\\"\}\\""`)
runspace1 = regexp.MustCompile(`(?:^|\})[^\{:]+\s+:+[^\{]*\{`)
runspace2 = regexp.MustCompile(`\s+([!\{\};:>+\(\)\],])`)
runspace3 = regexp.MustCompile(`([!\{\}:;>+\(\[,])\s+`)
rsemicolons = regexp.MustCompile(`([^;\}])\}`)
runits = regexp.MustCompile(`(?i)([\s:])([+-]?0)(?:%|em|ex|px|in|cm|mm|pt|pc)`)
rfourzero = regexp.MustCompile(`:(?:0 )+0;`)
rleadzero = regexp.MustCompile(`(:|\s)0+\.(\d+)`)
rrgb = regexp.MustCompile(`rgb\s*\(\s*([0-9,\s]+)\s*\)`)
rdigits = regexp.MustCompile(`\d+`)
rcompresshex = regexp.MustCompile(`(?i)([^"'=\s])(\s?)\s*#([0-9a-f]){6}`)
rhexval = regexp.MustCompile(`[0-9a-f]{2}`)
remptyrules = regexp.MustCompile(`[^\}]+\{;\}\n`)
rmediaspace = regexp.MustCompile(`\band\(`)
rredsemicolons = regexp.MustCompile(`;+\}`)
)
func Minify(css []byte) (minified []byte) {
// Remove comments.
css = rcomments.ReplaceAll(css, []byte{})
// Compress all runs of whitespace to a single space to make things easier
// to work with.
css = rwhitespace.ReplaceAll(css, []byte(" "))
// Replace box model hacks with placeholders.
css = rbmh.ReplaceAll(css, []byte("___BMH___"))
// Remove unnecessary spaces, but be careful not to turn "p :link {...}"
// into "p:link{...}".
css = runspace1.ReplaceAllFunc(css, func(match []byte) []byte {
return bytes.Replace(match, []byte(":"), []byte("___PSEUDOCLASSCOLON___"), -1)
})
css = runspace2.ReplaceAll(css, []byte("$1"))
css = bytes.Replace(css, []byte("___PSEUDOCLASSCOLON___"), []byte(":"), -1)
css = runspace3.ReplaceAll(css, []byte("$1"))
// Add missing semicolons.
css = rsemicolons.ReplaceAll(css, []byte("$1;}"))
// Replace 0(%, em, ex, px, in, cm, mm, pt, pc) with just 0.
css = runits.ReplaceAll(css, []byte("$1$2"))
// Replace 0 0 0 0; with 0.
css = rfourzero.ReplaceAll(css, []byte(":0;"))
// Replace background-position:0; with background-position:0 0;
css = bytes.Replace(css, []byte("background-position:0;"), []byte("background-position:0 0;"), -1)
// Replace 0.6 with .6, but only when preceded by : or a space.
css = rleadzero.ReplaceAll(css, []byte("$1.$2"))
// Convert rgb color values to hex values.
css = rrgb.ReplaceAllFunc(css, func(match []byte) (out []byte) {
out = []byte{'#'}
for _, v := range rdigits.FindAll(match, -1) {
d, err := strconv.Atoi(string(v))
if err != nil {
return match
}
out = append(out, []byte(fmt.Sprintf("%02x", d))...)
}
return out
})
// Compress color hex values, making sure not to touch values used in IE
// filters, since they would break.
css = rcompresshex.ReplaceAllFunc(css, func(match []byte) (out []byte) {
vals := rhexval.FindAll(match, -1)
if len(vals) != 3 {
return match
}
compressible := true
for _, v := range vals {
if v[0] != v[1] {
compressible = false
}
}
if !compressible {
return match
}
out = append(out, match[:bytes.IndexByte(match, '#')+1]...)
return append(out, vals[0][0], vals[1][0], vals[2][0])
})
// Remove empty rules.
css = remptyrules.ReplaceAll(css, []byte{})
// Re-insert box model hacks.
css = bytes.Replace(css, []byte("___BMH___"), []byte(`"\"}\""`), -1)
// Put the space back in for media queries
css = rmediaspace.ReplaceAll(css, []byte("and ("))
// Prevent redundant semicolons.
css = rredsemicolons.ReplaceAll(css, []byte("}"))
return bytes.TrimSpace(css)
}
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