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diff --git a/vendor/github.com/tdewolff/parse/css/README.md b/vendor/github.com/tdewolff/parse/css/README.md
new file mode 100644
index 0000000..2013248
--- /dev/null
+++ b/vendor/github.com/tdewolff/parse/css/README.md
@@ -0,0 +1,171 @@
+# CSS [![GoDoc](http://godoc.org/github.com/tdewolff/parse/css?status.svg)](http://godoc.org/github.com/tdewolff/parse/css) [![GoCover](http://gocover.io/_badge/github.com/tdewolff/parse/css)](http://gocover.io/github.com/tdewolff/parse/css)
+
+This package is a CSS3 lexer and parser written in [Go][1]. Both follow the specification at [CSS Syntax Module Level 3](http://www.w3.org/TR/css-syntax-3/). The lexer takes an io.Reader and converts it into tokens until the EOF. The parser returns a parse tree of the full io.Reader input stream, but the low-level `Next` function can be used for stream parsing to returns grammar units until the EOF.
+
+## Installation
+Run the following command
+
+	go get github.com/tdewolff/parse/css
+
+or add the following import and run project with `go get`
+
+	import "github.com/tdewolff/parse/css"
+
+## Lexer
+### Usage
+The following initializes a new Lexer with io.Reader `r`:
+``` go
+l := css.NewLexer(r)
+```
+
+To tokenize until EOF an error, use:
+``` go
+for {
+	tt, text := l.Next()
+	switch tt {
+	case css.ErrorToken:
+		// error or EOF set in l.Err()
+		return
+	// ...
+	}
+}
+```
+
+All tokens (see [CSS Syntax Module Level 3](http://www.w3.org/TR/css3-syntax/)):
+``` go
+ErrorToken			// non-official token, returned when errors occur
+IdentToken
+FunctionToken		// rgb( rgba( ...
+AtKeywordToken		// @abc
+HashToken			// #abc
+StringToken
+BadStringToken
+UrlToken			// url(
+BadUrlToken
+DelimToken			// any unmatched character
+NumberToken			// 5
+PercentageToken		// 5%
+DimensionToken		// 5em
+UnicodeRangeToken
+IncludeMatchToken	// ~=
+DashMatchToken		// |=
+PrefixMatchToken	// ^=
+SuffixMatchToken	// $=
+SubstringMatchToken // *=
+ColumnToken			// ||
+WhitespaceToken
+CDOToken 			// <!--
+CDCToken 			// -->
+ColonToken
+SemicolonToken
+CommaToken
+BracketToken 		// ( ) [ ] { }, all bracket tokens use this, Data() can distinguish between the brackets
+CommentToken		// non-official token
+```
+
+### Examples
+``` go
+package main
+
+import (
+	"os"
+
+	"github.com/tdewolff/parse/css"
+)
+
+// Tokenize CSS3 from stdin.
+func main() {
+	l := css.NewLexer(os.Stdin)
+	for {
+		tt, text := l.Next()
+		switch tt {
+		case css.ErrorToken:
+			if l.Err() != io.EOF {
+				fmt.Println("Error on line", l.Line(), ":", l.Err())
+			}
+			return
+		case css.IdentToken:
+			fmt.Println("Identifier", string(text))
+		case css.NumberToken:
+			fmt.Println("Number", string(text))
+		// ...
+		}
+	}
+}
+```
+
+## Parser
+### Usage
+The following creates a new Parser.
+``` go
+// true because this is the content of an inline style attribute
+p := css.NewParser(bytes.NewBufferString("color: red;"), true)
+```
+
+To iterate over the stylesheet, use:
+``` go
+for {
+    gt, _, data := p.Next()
+    if gt == css.ErrorGrammar {
+        break
+    }
+    // ...
+}
+```
+
+All grammar units returned by `Next`:
+``` go
+ErrorGrammar
+AtRuleGrammar
+EndAtRuleGrammar
+RulesetGrammar
+EndRulesetGrammar
+DeclarationGrammar
+TokenGrammar
+```
+
+### Examples
+``` go
+package main
+
+import (
+	"bytes"
+	"fmt"
+
+	"github.com/tdewolff/parse/css"
+)
+
+func main() {
+	// true because this is the content of an inline style attribute
+	p := css.NewParser(bytes.NewBufferString("color: red;"), true)
+	out := ""
+	for {
+		gt, _, data := p.Next()
+		if gt == css.ErrorGrammar {
+			break
+		} else if gt == css.AtRuleGrammar || gt == css.BeginAtRuleGrammar || gt == css.BeginRulesetGrammar || gt == css.DeclarationGrammar {
+			out += string(data)
+			if gt == css.DeclarationGrammar {
+				out += ":"
+			}
+			for _, val := range p.Values() {
+				out += string(val.Data)
+			}
+			if gt == css.BeginAtRuleGrammar || gt == css.BeginRulesetGrammar {
+				out += "{"
+			} else if gt == css.AtRuleGrammar || gt == css.DeclarationGrammar {
+				out += ";"
+			}
+		} else {
+			out += string(data)
+		}
+	}
+	fmt.Println(out)
+}
+
+```
+
+## License
+Released under the [MIT license](https://github.com/tdewolff/parse/blob/master/LICENSE.md).
+
+[1]: http://golang.org/ "Go Language"
diff --git a/vendor/github.com/tdewolff/parse/css/hash.go b/vendor/github.com/tdewolff/parse/css/hash.go
new file mode 100644
index 0000000..95595c3
--- /dev/null
+++ b/vendor/github.com/tdewolff/parse/css/hash.go
@@ -0,0 +1,676 @@
+package css
+
+// generated by hasher -type=Hash -file=hash.go; DO NOT EDIT, except for adding more constants to the list and rerun go generate
+
+// uses github.com/tdewolff/hasher
+//go:generate hasher -type=Hash -file=hash.go
+
+// Hash defines perfect hashes for a predefined list of strings
+type Hash uint32
+
+// Unique hash definitions to be used instead of strings
+const (
+	Accelerator                 Hash = 0x47f0b // accelerator
+	Aliceblue                   Hash = 0x52509 // aliceblue
+	Alpha                       Hash = 0x5af05 // alpha
+	Antiquewhite                Hash = 0x45c0c // antiquewhite
+	Aquamarine                  Hash = 0x7020a // aquamarine
+	Azimuth                     Hash = 0x5b307 // azimuth
+	Background                  Hash = 0xa     // background
+	Background_Attachment       Hash = 0x3a15  // background-attachment
+	Background_Color            Hash = 0x11c10 // background-color
+	Background_Image            Hash = 0x99210 // background-image
+	Background_Position         Hash = 0x13    // background-position
+	Background_Position_X       Hash = 0x80815 // background-position-x
+	Background_Position_Y       Hash = 0x15    // background-position-y
+	Background_Repeat           Hash = 0x1511  // background-repeat
+	Behavior                    Hash = 0x3108  // behavior
+	Black                       Hash = 0x6005  // black
+	Blanchedalmond              Hash = 0x650e  // blanchedalmond
+	Blueviolet                  Hash = 0x52a0a // blueviolet
+	Bold                        Hash = 0x7a04  // bold
+	Border                      Hash = 0x8506  // border
+	Border_Bottom               Hash = 0x850d  // border-bottom
+	Border_Bottom_Color         Hash = 0x8513  // border-bottom-color
+	Border_Bottom_Style         Hash = 0xbe13  // border-bottom-style
+	Border_Bottom_Width         Hash = 0xe113  // border-bottom-width
+	Border_Collapse             Hash = 0x1020f // border-collapse
+	Border_Color                Hash = 0x1350c // border-color
+	Border_Left                 Hash = 0x15c0b // border-left
+	Border_Left_Color           Hash = 0x15c11 // border-left-color
+	Border_Left_Style           Hash = 0x17911 // border-left-style
+	Border_Left_Width           Hash = 0x18a11 // border-left-width
+	Border_Right                Hash = 0x19b0c // border-right
+	Border_Right_Color          Hash = 0x19b12 // border-right-color
+	Border_Right_Style          Hash = 0x1ad12 // border-right-style
+	Border_Right_Width          Hash = 0x1bf12 // border-right-width
+	Border_Spacing              Hash = 0x1d10e // border-spacing
+	Border_Style                Hash = 0x1f40c // border-style
+	Border_Top                  Hash = 0x2000a // border-top
+	Border_Top_Color            Hash = 0x20010 // border-top-color
+	Border_Top_Style            Hash = 0x21010 // border-top-style
+	Border_Top_Width            Hash = 0x22010 // border-top-width
+	Border_Width                Hash = 0x2300c // border-width
+	Bottom                      Hash = 0x8c06  // bottom
+	Burlywood                   Hash = 0x23c09 // burlywood
+	Cadetblue                   Hash = 0x25809 // cadetblue
+	Caption_Side                Hash = 0x2610c // caption-side
+	Charset                     Hash = 0x44207 // charset
+	Chartreuse                  Hash = 0x2730a // chartreuse
+	Chocolate                   Hash = 0x27d09 // chocolate
+	Clear                       Hash = 0x2ab05 // clear
+	Clip                        Hash = 0x2b004 // clip
+	Color                       Hash = 0x9305  // color
+	Content                     Hash = 0x2e507 // content
+	Cornflowerblue              Hash = 0x2ff0e // cornflowerblue
+	Cornsilk                    Hash = 0x30d08 // cornsilk
+	Counter_Increment           Hash = 0x31511 // counter-increment
+	Counter_Reset               Hash = 0x3540d // counter-reset
+	Cue                         Hash = 0x36103 // cue
+	Cue_After                   Hash = 0x36109 // cue-after
+	Cue_Before                  Hash = 0x36a0a // cue-before
+	Cursive                     Hash = 0x37b07 // cursive
+	Cursor                      Hash = 0x38e06 // cursor
+	Darkblue                    Hash = 0x7208  // darkblue
+	Darkcyan                    Hash = 0x7d08  // darkcyan
+	Darkgoldenrod               Hash = 0x2440d // darkgoldenrod
+	Darkgray                    Hash = 0x25008 // darkgray
+	Darkgreen                   Hash = 0x79209 // darkgreen
+	Darkkhaki                   Hash = 0x88509 // darkkhaki
+	Darkmagenta                 Hash = 0x4f40b // darkmagenta
+	Darkolivegreen              Hash = 0x7210e // darkolivegreen
+	Darkorange                  Hash = 0x7860a // darkorange
+	Darkorchid                  Hash = 0x87c0a // darkorchid
+	Darksalmon                  Hash = 0x8c00a // darksalmon
+	Darkseagreen                Hash = 0x9240c // darkseagreen
+	Darkslateblue               Hash = 0x3940d // darkslateblue
+	Darkslategray               Hash = 0x3a10d // darkslategray
+	Darkturquoise               Hash = 0x3ae0d // darkturquoise
+	Darkviolet                  Hash = 0x3bb0a // darkviolet
+	Deeppink                    Hash = 0x26b08 // deeppink
+	Deepskyblue                 Hash = 0x8930b // deepskyblue
+	Default                     Hash = 0x57b07 // default
+	Direction                   Hash = 0x9f109 // direction
+	Display                     Hash = 0x3c507 // display
+	Document                    Hash = 0x3d308 // document
+	Dodgerblue                  Hash = 0x3db0a // dodgerblue
+	Elevation                   Hash = 0x4a009 // elevation
+	Empty_Cells                 Hash = 0x4c20b // empty-cells
+	Fantasy                     Hash = 0x5ce07 // fantasy
+	Filter                      Hash = 0x59806 // filter
+	Firebrick                   Hash = 0x3e509 // firebrick
+	Float                       Hash = 0x3ee05 // float
+	Floralwhite                 Hash = 0x3f30b // floralwhite
+	Font                        Hash = 0xd804  // font
+	Font_Face                   Hash = 0xd809  // font-face
+	Font_Family                 Hash = 0x41d0b // font-family
+	Font_Size                   Hash = 0x42809 // font-size
+	Font_Size_Adjust            Hash = 0x42810 // font-size-adjust
+	Font_Stretch                Hash = 0x4380c // font-stretch
+	Font_Style                  Hash = 0x4490a // font-style
+	Font_Variant                Hash = 0x4530c // font-variant
+	Font_Weight                 Hash = 0x46e0b // font-weight
+	Forestgreen                 Hash = 0x3700b // forestgreen
+	Fuchsia                     Hash = 0x47907 // fuchsia
+	Gainsboro                   Hash = 0x14c09 // gainsboro
+	Ghostwhite                  Hash = 0x1de0a // ghostwhite
+	Goldenrod                   Hash = 0x24809 // goldenrod
+	Greenyellow                 Hash = 0x7960b // greenyellow
+	Height                      Hash = 0x68506 // height
+	Honeydew                    Hash = 0x5b908 // honeydew
+	Hsl                         Hash = 0xf303  // hsl
+	Hsla                        Hash = 0xf304  // hsla
+	Ime_Mode                    Hash = 0x88d08 // ime-mode
+	Import                      Hash = 0x4e306 // import
+	Important                   Hash = 0x4e309 // important
+	Include_Source              Hash = 0x7f20e // include-source
+	Indianred                   Hash = 0x4ec09 // indianred
+	Inherit                     Hash = 0x51907 // inherit
+	Initial                     Hash = 0x52007 // initial
+	Keyframes                   Hash = 0x40109 // keyframes
+	Lavender                    Hash = 0xf508  // lavender
+	Lavenderblush               Hash = 0xf50d  // lavenderblush
+	Lawngreen                   Hash = 0x4da09 // lawngreen
+	Layer_Background_Color      Hash = 0x11616 // layer-background-color
+	Layer_Background_Image      Hash = 0x98c16 // layer-background-image
+	Layout_Flow                 Hash = 0x5030b // layout-flow
+	Layout_Grid                 Hash = 0x53f0b // layout-grid
+	Layout_Grid_Char            Hash = 0x53f10 // layout-grid-char
+	Layout_Grid_Char_Spacing    Hash = 0x53f18 // layout-grid-char-spacing
+	Layout_Grid_Line            Hash = 0x55710 // layout-grid-line
+	Layout_Grid_Mode            Hash = 0x56d10 // layout-grid-mode
+	Layout_Grid_Type            Hash = 0x58210 // layout-grid-type
+	Left                        Hash = 0x16304 // left
+	Lemonchiffon                Hash = 0xcf0c  // lemonchiffon
+	Letter_Spacing              Hash = 0x5310e // letter-spacing
+	Lightblue                   Hash = 0x59e09 // lightblue
+	Lightcoral                  Hash = 0x5a70a // lightcoral
+	Lightcyan                   Hash = 0x5d509 // lightcyan
+	Lightgoldenrodyellow        Hash = 0x5de14 // lightgoldenrodyellow
+	Lightgray                   Hash = 0x60509 // lightgray
+	Lightgreen                  Hash = 0x60e0a // lightgreen
+	Lightpink                   Hash = 0x61809 // lightpink
+	Lightsalmon                 Hash = 0x6210b // lightsalmon
+	Lightseagreen               Hash = 0x62c0d // lightseagreen
+	Lightskyblue                Hash = 0x6390c // lightskyblue
+	Lightslateblue              Hash = 0x6450e // lightslateblue
+	Lightsteelblue              Hash = 0x6530e // lightsteelblue
+	Lightyellow                 Hash = 0x6610b // lightyellow
+	Limegreen                   Hash = 0x67709 // limegreen
+	Line_Break                  Hash = 0x5630a // line-break
+	Line_Height                 Hash = 0x6800b // line-height
+	List_Style                  Hash = 0x68b0a // list-style
+	List_Style_Image            Hash = 0x68b10 // list-style-image
+	List_Style_Position         Hash = 0x69b13 // list-style-position
+	List_Style_Type             Hash = 0x6ae0f // list-style-type
+	Magenta                     Hash = 0x4f807 // magenta
+	Margin                      Hash = 0x2c006 // margin
+	Margin_Bottom               Hash = 0x2c00d // margin-bottom
+	Margin_Left                 Hash = 0x2cc0b // margin-left
+	Margin_Right                Hash = 0x3320c // margin-right
+	Margin_Top                  Hash = 0x7cd0a // margin-top
+	Marker_Offset               Hash = 0x6bd0d // marker-offset
+	Marks                       Hash = 0x6ca05 // marks
+	Max_Height                  Hash = 0x6e90a // max-height
+	Max_Width                   Hash = 0x6f309 // max-width
+	Media                       Hash = 0xa1405 // media
+	Mediumaquamarine            Hash = 0x6fc10 // mediumaquamarine
+	Mediumblue                  Hash = 0x70c0a // mediumblue
+	Mediumorchid                Hash = 0x7160c // mediumorchid
+	Mediumpurple                Hash = 0x72f0c // mediumpurple
+	Mediumseagreen              Hash = 0x73b0e // mediumseagreen
+	Mediumslateblue             Hash = 0x7490f // mediumslateblue
+	Mediumspringgreen           Hash = 0x75811 // mediumspringgreen
+	Mediumturquoise             Hash = 0x7690f // mediumturquoise
+	Mediumvioletred             Hash = 0x7780f // mediumvioletred
+	Midnightblue                Hash = 0x7a60c // midnightblue
+	Min_Height                  Hash = 0x7b20a // min-height
+	Min_Width                   Hash = 0x7bc09 // min-width
+	Mintcream                   Hash = 0x7c509 // mintcream
+	Mistyrose                   Hash = 0x7e309 // mistyrose
+	Moccasin                    Hash = 0x7ec08 // moccasin
+	Monospace                   Hash = 0x8c709 // monospace
+	Namespace                   Hash = 0x49809 // namespace
+	Navajowhite                 Hash = 0x4a80b // navajowhite
+	None                        Hash = 0x4bf04 // none
+	Normal                      Hash = 0x4d506 // normal
+	Olivedrab                   Hash = 0x80009 // olivedrab
+	Orangered                   Hash = 0x78a09 // orangered
+	Orphans                     Hash = 0x48807 // orphans
+	Outline                     Hash = 0x81d07 // outline
+	Outline_Color               Hash = 0x81d0d // outline-color
+	Outline_Style               Hash = 0x82a0d // outline-style
+	Outline_Width               Hash = 0x8370d // outline-width
+	Overflow                    Hash = 0x2db08 // overflow
+	Overflow_X                  Hash = 0x2db0a // overflow-x
+	Overflow_Y                  Hash = 0x8440a // overflow-y
+	Padding                     Hash = 0x2b307 // padding
+	Padding_Bottom              Hash = 0x2b30e // padding-bottom
+	Padding_Left                Hash = 0x5f90c // padding-left
+	Padding_Right               Hash = 0x7d60d // padding-right
+	Padding_Top                 Hash = 0x8d90b // padding-top
+	Page                        Hash = 0x84e04 // page
+	Page_Break_After            Hash = 0x8e310 // page-break-after
+	Page_Break_Before           Hash = 0x84e11 // page-break-before
+	Page_Break_Inside           Hash = 0x85f11 // page-break-inside
+	Palegoldenrod               Hash = 0x8700d // palegoldenrod
+	Palegreen                   Hash = 0x89e09 // palegreen
+	Paleturquoise               Hash = 0x8a70d // paleturquoise
+	Palevioletred               Hash = 0x8b40d // palevioletred
+	Papayawhip                  Hash = 0x8d00a // papayawhip
+	Pause                       Hash = 0x8f305 // pause
+	Pause_After                 Hash = 0x8f30b // pause-after
+	Pause_Before                Hash = 0x8fe0c // pause-before
+	Peachpuff                   Hash = 0x59009 // peachpuff
+	Pitch                       Hash = 0x90a05 // pitch
+	Pitch_Range                 Hash = 0x90a0b // pitch-range
+	Play_During                 Hash = 0x3c80b // play-during
+	Position                    Hash = 0xb08   // position
+	Powderblue                  Hash = 0x9150a // powderblue
+	Progid                      Hash = 0x91f06 // progid
+	Quotes                      Hash = 0x93006 // quotes
+	Rgb                         Hash = 0x3803  // rgb
+	Rgba                        Hash = 0x3804  // rgba
+	Richness                    Hash = 0x9708  // richness
+	Right                       Hash = 0x1a205 // right
+	Rosybrown                   Hash = 0x15309 // rosybrown
+	Royalblue                   Hash = 0xb509  // royalblue
+	Ruby_Align                  Hash = 0x12b0a // ruby-align
+	Ruby_Overhang               Hash = 0x1400d // ruby-overhang
+	Ruby_Position               Hash = 0x16c0d // ruby-position
+	Saddlebrown                 Hash = 0x48e0b // saddlebrown
+	Sandybrown                  Hash = 0x4cc0a // sandybrown
+	Sans_Serif                  Hash = 0x5c50a // sans-serif
+	Scrollbar_3d_Light_Color    Hash = 0x9e18  // scrollbar-3d-light-color
+	Scrollbar_Arrow_Color       Hash = 0x29615 // scrollbar-arrow-color
+	Scrollbar_Base_Color        Hash = 0x40914 // scrollbar-base-color
+	Scrollbar_Dark_Shadow_Color Hash = 0x6ce1b // scrollbar-dark-shadow-color
+	Scrollbar_Face_Color        Hash = 0x93514 // scrollbar-face-color
+	Scrollbar_Highlight_Color   Hash = 0x9ce19 // scrollbar-highlight-color
+	Scrollbar_Shadow_Color      Hash = 0x94916 // scrollbar-shadow-color
+	Scrollbar_Track_Color       Hash = 0x95f15 // scrollbar-track-color
+	Seagreen                    Hash = 0x63108 // seagreen
+	Seashell                    Hash = 0x10f08 // seashell
+	Serif                       Hash = 0x5ca05 // serif
+	Size                        Hash = 0x42d04 // size
+	Slateblue                   Hash = 0x39809 // slateblue
+	Slategray                   Hash = 0x3a509 // slategray
+	Speak                       Hash = 0x97405 // speak
+	Speak_Header                Hash = 0x9740c // speak-header
+	Speak_Numeral               Hash = 0x9800d // speak-numeral
+	Speak_Punctuation           Hash = 0x9a211 // speak-punctuation
+	Speech_Rate                 Hash = 0x9b30b // speech-rate
+	Springgreen                 Hash = 0x75e0b // springgreen
+	Steelblue                   Hash = 0x65809 // steelblue
+	Stress                      Hash = 0x29106 // stress
+	Supports                    Hash = 0x9c708 // supports
+	Table_Layout                Hash = 0x4fd0c // table-layout
+	Text_Align                  Hash = 0x2840a // text-align
+	Text_Align_Last             Hash = 0x2840f // text-align-last
+	Text_Autospace              Hash = 0x1e60e // text-autospace
+	Text_Decoration             Hash = 0x4b10f // text-decoration
+	Text_Indent                 Hash = 0x9bc0b // text-indent
+	Text_Justify                Hash = 0x250c  // text-justify
+	Text_Kashida_Space          Hash = 0x4e12  // text-kashida-space
+	Text_Overflow               Hash = 0x2d60d // text-overflow
+	Text_Shadow                 Hash = 0x2eb0b // text-shadow
+	Text_Transform              Hash = 0x3250e // text-transform
+	Text_Underline_Position     Hash = 0x33d17 // text-underline-position
+	Top                         Hash = 0x20703 // top
+	Turquoise                   Hash = 0x3b209 // turquoise
+	Unicode_Bidi                Hash = 0x9e70c // unicode-bidi
+	Vertical_Align              Hash = 0x3800e // vertical-align
+	Visibility                  Hash = 0x9fa0a // visibility
+	Voice_Family                Hash = 0xa040c // voice-family
+	Volume                      Hash = 0xa1006 // volume
+	White                       Hash = 0x1e305 // white
+	White_Space                 Hash = 0x4630b // white-space
+	Whitesmoke                  Hash = 0x3f90a // whitesmoke
+	Widows                      Hash = 0x5c006 // widows
+	Width                       Hash = 0xef05  // width
+	Word_Break                  Hash = 0x2f50a // word-break
+	Word_Spacing                Hash = 0x50d0c // word-spacing
+	Word_Wrap                   Hash = 0x5f109 // word-wrap
+	Writing_Mode                Hash = 0x66b0c // writing-mode
+	Yellow                      Hash = 0x5ec06 // yellow
+	Yellowgreen                 Hash = 0x79b0b // yellowgreen
+	Z_Index                     Hash = 0xa1907 // z-index
+)
+
+// String returns the hash' name.
+func (i Hash) String() string {
+	start := uint32(i >> 8)
+	n := uint32(i & 0xff)
+	if start+n > uint32(len(_Hash_text)) {
+		return ""
+	}
+	return _Hash_text[start : start+n]
+}
+
+// ToHash returns the hash whose name is s. It returns zero if there is no
+// such hash. It is case sensitive.
+func ToHash(s []byte) Hash {
+	if len(s) == 0 || len(s) > _Hash_maxLen {
+		return 0
+	}
+	h := uint32(_Hash_hash0)
+	for i := 0; i < len(s); i++ {
+		h ^= uint32(s[i])
+		h *= 16777619
+	}
+	if i := _Hash_table[h&uint32(len(_Hash_table)-1)]; int(i&0xff) == len(s) {
+		t := _Hash_text[i>>8 : i>>8+i&0xff]
+		for i := 0; i < len(s); i++ {
+			if t[i] != s[i] {
+				goto NEXT
+			}
+		}
+		return i
+	}
+NEXT:
+	if i := _Hash_table[(h>>16)&uint32(len(_Hash_table)-1)]; int(i&0xff) == len(s) {
+		t := _Hash_text[i>>8 : i>>8+i&0xff]
+		for i := 0; i < len(s); i++ {
+			if t[i] != s[i] {
+				return 0
+			}
+		}
+		return i
+	}
+	return 0
+}
+
+const _Hash_hash0 = 0x700e0976
+const _Hash_maxLen = 27
+const _Hash_text = "background-position-ybackground-repeatext-justifybehaviorgba" +
+	"ckground-attachmentext-kashida-spaceblackblanchedalmondarkbl" +
+	"ueboldarkcyanborder-bottom-colorichnesscrollbar-3d-light-col" +
+	"oroyalblueborder-bottom-stylemonchiffont-faceborder-bottom-w" +
+	"idthslavenderblushborder-collapseashellayer-background-color" +
+	"uby-alignborder-coloruby-overhangainsborosybrownborder-left-" +
+	"coloruby-positionborder-left-styleborder-left-widthborder-ri" +
+	"ght-colorborder-right-styleborder-right-widthborder-spacingh" +
+	"ostwhitext-autospaceborder-styleborder-top-colorborder-top-s" +
+	"tyleborder-top-widthborder-widthburlywoodarkgoldenrodarkgray" +
+	"cadetbluecaption-sideeppinkchartreusechocolatext-align-lastr" +
+	"esscrollbar-arrow-colorclearclipadding-bottomargin-bottomarg" +
+	"in-leftext-overflow-xcontentext-shadoword-breakcornflowerblu" +
+	"ecornsilkcounter-incrementext-transformargin-rightext-underl" +
+	"ine-positioncounter-resetcue-aftercue-beforestgreencursivert" +
+	"ical-aligncursordarkslatebluedarkslategraydarkturquoisedarkv" +
+	"ioletdisplay-duringdocumentdodgerbluefirebrickfloatfloralwhi" +
+	"tesmokeyframescrollbar-base-colorfont-familyfont-size-adjust" +
+	"font-stretcharsetfont-stylefont-variantiquewhite-spacefont-w" +
+	"eightfuchsiacceleratorphansaddlebrownamespacelevationavajowh" +
+	"itext-decorationonempty-cellsandybrownormalawngreenimportant" +
+	"indianredarkmagentable-layout-floword-spacinginheritinitiali" +
+	"cebluevioletter-spacinglayout-grid-char-spacinglayout-grid-l" +
+	"ine-breaklayout-grid-modefaultlayout-grid-typeachpuffilterli" +
+	"ghtbluelightcoralphazimuthoneydewidowsans-serifantasylightcy" +
+	"anlightgoldenrodyelloword-wrapadding-leftlightgraylightgreen" +
+	"lightpinklightsalmonlightseagreenlightskybluelightslatebluel" +
+	"ightsteelbluelightyellowriting-modelimegreenline-heightlist-" +
+	"style-imagelist-style-positionlist-style-typemarker-offsetma" +
+	"rkscrollbar-dark-shadow-colormax-heightmax-widthmediumaquama" +
+	"rinemediumbluemediumorchidarkolivegreenmediumpurplemediumsea" +
+	"greenmediumslatebluemediumspringgreenmediumturquoisemediumvi" +
+	"oletredarkorangeredarkgreenyellowgreenmidnightbluemin-height" +
+	"min-widthmintcreamargin-topadding-rightmistyrosemoccasinclud" +
+	"e-sourceolivedrabackground-position-xoutline-coloroutline-st" +
+	"yleoutline-widthoverflow-ypage-break-beforepage-break-inside" +
+	"palegoldenrodarkorchidarkkhakime-modeepskybluepalegreenpalet" +
+	"urquoisepalevioletredarksalmonospacepapayawhipadding-topage-" +
+	"break-afterpause-afterpause-beforepitch-rangepowderblueprogi" +
+	"darkseagreenquotescrollbar-face-colorscrollbar-shadow-colors" +
+	"crollbar-track-colorspeak-headerspeak-numeralayer-background" +
+	"-imagespeak-punctuationspeech-ratext-indentsupportscrollbar-" +
+	"highlight-colorunicode-bidirectionvisibilityvoice-familyvolu" +
+	"mediaz-index"
+
+var _Hash_table = [1 << 9]Hash{
+	0x0:   0x4cc0a, // sandybrown
+	0x1:   0x20703, // top
+	0x4:   0xb509,  // royalblue
+	0x6:   0x4b10f, // text-decoration
+	0xb:   0x5030b, // layout-flow
+	0xc:   0x11c10, // background-color
+	0xd:   0x8c06,  // bottom
+	0x10:  0x62c0d, // lightseagreen
+	0x11:  0x8930b, // deepskyblue
+	0x12:  0x39809, // slateblue
+	0x13:  0x4c20b, // empty-cells
+	0x14:  0x2b004, // clip
+	0x15:  0x70c0a, // mediumblue
+	0x16:  0x49809, // namespace
+	0x18:  0x2c00d, // margin-bottom
+	0x1a:  0x1350c, // border-color
+	0x1b:  0x5b908, // honeydew
+	0x1d:  0x2300c, // border-width
+	0x1e:  0x9740c, // speak-header
+	0x1f:  0x8b40d, // palevioletred
+	0x20:  0x1d10e, // border-spacing
+	0x22:  0x2b307, // padding
+	0x23:  0x3320c, // margin-right
+	0x27:  0x7bc09, // min-width
+	0x29:  0x60509, // lightgray
+	0x2a:  0x6610b, // lightyellow
+	0x2c:  0x8e310, // page-break-after
+	0x2d:  0x2e507, // content
+	0x30:  0x250c,  // text-justify
+	0x32:  0x2840f, // text-align-last
+	0x34:  0x93514, // scrollbar-face-color
+	0x35:  0x40109, // keyframes
+	0x37:  0x4f807, // magenta
+	0x38:  0x3a509, // slategray
+	0x3a:  0x99210, // background-image
+	0x3c:  0x7f20e, // include-source
+	0x3d:  0x65809, // steelblue
+	0x3e:  0x81d0d, // outline-color
+	0x40:  0x1020f, // border-collapse
+	0x41:  0xf508,  // lavender
+	0x42:  0x9c708, // supports
+	0x44:  0x6800b, // line-height
+	0x45:  0x9a211, // speak-punctuation
+	0x46:  0x9fa0a, // visibility
+	0x47:  0x2ab05, // clear
+	0x4b:  0x52a0a, // blueviolet
+	0x4e:  0x57b07, // default
+	0x50:  0x6bd0d, // marker-offset
+	0x52:  0x31511, // counter-increment
+	0x53:  0x6450e, // lightslateblue
+	0x54:  0x10f08, // seashell
+	0x56:  0x16c0d, // ruby-position
+	0x57:  0x82a0d, // outline-style
+	0x58:  0x63108, // seagreen
+	0x59:  0x9305,  // color
+	0x5c:  0x2610c, // caption-side
+	0x5d:  0x68506, // height
+	0x5e:  0x7490f, // mediumslateblue
+	0x5f:  0x8fe0c, // pause-before
+	0x60:  0xcf0c,  // lemonchiffon
+	0x63:  0x37b07, // cursive
+	0x66:  0x4a80b, // navajowhite
+	0x67:  0xa040c, // voice-family
+	0x68:  0x2440d, // darkgoldenrod
+	0x69:  0x3e509, // firebrick
+	0x6a:  0x4490a, // font-style
+	0x6b:  0x9f109, // direction
+	0x6d:  0x7860a, // darkorange
+	0x6f:  0x4530c, // font-variant
+	0x70:  0x2c006, // margin
+	0x71:  0x84e11, // page-break-before
+	0x73:  0x2d60d, // text-overflow
+	0x74:  0x4e12,  // text-kashida-space
+	0x75:  0x30d08, // cornsilk
+	0x76:  0x46e0b, // font-weight
+	0x77:  0x42d04, // size
+	0x78:  0x53f0b, // layout-grid
+	0x79:  0x8d90b, // padding-top
+	0x7a:  0x44207, // charset
+	0x7d:  0x7e309, // mistyrose
+	0x7e:  0x5b307, // azimuth
+	0x7f:  0x8f30b, // pause-after
+	0x84:  0x38e06, // cursor
+	0x85:  0xf303,  // hsl
+	0x86:  0x5310e, // letter-spacing
+	0x8b:  0x3d308, // document
+	0x8d:  0x36109, // cue-after
+	0x8f:  0x36a0a, // cue-before
+	0x91:  0x5ce07, // fantasy
+	0x94:  0x1400d, // ruby-overhang
+	0x95:  0x2b30e, // padding-bottom
+	0x9a:  0x59e09, // lightblue
+	0x9c:  0x8c00a, // darksalmon
+	0x9d:  0x42810, // font-size-adjust
+	0x9e:  0x61809, // lightpink
+	0xa0:  0x9240c, // darkseagreen
+	0xa2:  0x85f11, // page-break-inside
+	0xa4:  0x24809, // goldenrod
+	0xa6:  0xa1405, // media
+	0xa7:  0x53f18, // layout-grid-char-spacing
+	0xa9:  0x4e309, // important
+	0xaa:  0x7b20a, // min-height
+	0xb0:  0x15c11, // border-left-color
+	0xb1:  0x84e04, // page
+	0xb2:  0x98c16, // layer-background-image
+	0xb5:  0x55710, // layout-grid-line
+	0xb6:  0x1511,  // background-repeat
+	0xb7:  0x8513,  // border-bottom-color
+	0xb9:  0x25008, // darkgray
+	0xbb:  0x5f90c, // padding-left
+	0xbc:  0x1a205, // right
+	0xc0:  0x40914, // scrollbar-base-color
+	0xc1:  0x6530e, // lightsteelblue
+	0xc2:  0xef05,  // width
+	0xc5:  0x3b209, // turquoise
+	0xc8:  0x3ee05, // float
+	0xca:  0x12b0a, // ruby-align
+	0xcb:  0xb08,   // position
+	0xcc:  0x7cd0a, // margin-top
+	0xce:  0x2cc0b, // margin-left
+	0xcf:  0x2eb0b, // text-shadow
+	0xd0:  0x2f50a, // word-break
+	0xd4:  0x3f90a, // whitesmoke
+	0xd6:  0x33d17, // text-underline-position
+	0xd7:  0x1bf12, // border-right-width
+	0xd8:  0x80009, // olivedrab
+	0xd9:  0x89e09, // palegreen
+	0xdb:  0x4e306, // import
+	0xdc:  0x6ca05, // marks
+	0xdd:  0x3bb0a, // darkviolet
+	0xde:  0x13,    // background-position
+	0xe0:  0x6fc10, // mediumaquamarine
+	0xe1:  0x7a04,  // bold
+	0xe2:  0x7690f, // mediumturquoise
+	0xe4:  0x8700d, // palegoldenrod
+	0xe5:  0x4f40b, // darkmagenta
+	0xe6:  0x15309, // rosybrown
+	0xe7:  0x18a11, // border-left-width
+	0xe8:  0x88509, // darkkhaki
+	0xea:  0x650e,  // blanchedalmond
+	0xeb:  0x52007, // initial
+	0xec:  0x6ce1b, // scrollbar-dark-shadow-color
+	0xee:  0x48e0b, // saddlebrown
+	0xef:  0x8a70d, // paleturquoise
+	0xf1:  0x19b12, // border-right-color
+	0xf3:  0x1e305, // white
+	0xf7:  0x9ce19, // scrollbar-highlight-color
+	0xf9:  0x56d10, // layout-grid-mode
+	0xfc:  0x1f40c, // border-style
+	0xfe:  0x69b13, // list-style-position
+	0x100: 0x11616, // layer-background-color
+	0x102: 0x58210, // layout-grid-type
+	0x103: 0x15c0b, // border-left
+	0x104: 0x2db08, // overflow
+	0x105: 0x7a60c, // midnightblue
+	0x10b: 0x2840a, // text-align
+	0x10e: 0x21010, // border-top-style
+	0x110: 0x5de14, // lightgoldenrodyellow
+	0x114: 0x8506,  // border
+	0x119: 0xd804,  // font
+	0x11c: 0x7020a, // aquamarine
+	0x11d: 0x60e0a, // lightgreen
+	0x11e: 0x5ec06, // yellow
+	0x120: 0x97405, // speak
+	0x121: 0x4630b, // white-space
+	0x123: 0x3940d, // darkslateblue
+	0x125: 0x1e60e, // text-autospace
+	0x128: 0xf50d,  // lavenderblush
+	0x12c: 0x6210b, // lightsalmon
+	0x12d: 0x51907, // inherit
+	0x131: 0x87c0a, // darkorchid
+	0x132: 0x2000a, // border-top
+	0x133: 0x3c80b, // play-during
+	0x137: 0x22010, // border-top-width
+	0x139: 0x48807, // orphans
+	0x13a: 0x41d0b, // font-family
+	0x13d: 0x3db0a, // dodgerblue
+	0x13f: 0x8d00a, // papayawhip
+	0x140: 0x8f305, // pause
+	0x143: 0x2ff0e, // cornflowerblue
+	0x144: 0x3c507, // display
+	0x146: 0x52509, // aliceblue
+	0x14a: 0x7208,  // darkblue
+	0x14b: 0x3108,  // behavior
+	0x14c: 0x3540d, // counter-reset
+	0x14d: 0x7960b, // greenyellow
+	0x14e: 0x75811, // mediumspringgreen
+	0x14f: 0x9150a, // powderblue
+	0x150: 0x53f10, // layout-grid-char
+	0x158: 0x81d07, // outline
+	0x159: 0x23c09, // burlywood
+	0x15b: 0xe113,  // border-bottom-width
+	0x15c: 0x4bf04, // none
+	0x15e: 0x36103, // cue
+	0x15f: 0x4fd0c, // table-layout
+	0x160: 0x90a0b, // pitch-range
+	0x161: 0xa1907, // z-index
+	0x162: 0x29106, // stress
+	0x163: 0x80815, // background-position-x
+	0x165: 0x4d506, // normal
+	0x167: 0x72f0c, // mediumpurple
+	0x169: 0x5a70a, // lightcoral
+	0x16c: 0x6e90a, // max-height
+	0x16d: 0x3804,  // rgba
+	0x16e: 0x68b10, // list-style-image
+	0x170: 0x26b08, // deeppink
+	0x173: 0x91f06, // progid
+	0x175: 0x75e0b, // springgreen
+	0x176: 0x3700b, // forestgreen
+	0x179: 0x7ec08, // moccasin
+	0x17a: 0x7780f, // mediumvioletred
+	0x17e: 0x9bc0b, // text-indent
+	0x181: 0x6ae0f, // list-style-type
+	0x182: 0x14c09, // gainsboro
+	0x183: 0x3ae0d, // darkturquoise
+	0x184: 0x3a10d, // darkslategray
+	0x189: 0x2db0a, // overflow-x
+	0x18b: 0x93006, // quotes
+	0x18c: 0x3a15,  // background-attachment
+	0x18f: 0x19b0c, // border-right
+	0x191: 0x6005,  // black
+	0x192: 0x79b0b, // yellowgreen
+	0x194: 0x59009, // peachpuff
+	0x197: 0x3f30b, // floralwhite
+	0x19c: 0x7210e, // darkolivegreen
+	0x19d: 0x5f109, // word-wrap
+	0x19e: 0x17911, // border-left-style
+	0x1a0: 0x9b30b, // speech-rate
+	0x1a1: 0x8370d, // outline-width
+	0x1a2: 0x9e70c, // unicode-bidi
+	0x1a3: 0x68b0a, // list-style
+	0x1a4: 0x90a05, // pitch
+	0x1a5: 0x95f15, // scrollbar-track-color
+	0x1a6: 0x47907, // fuchsia
+	0x1a8: 0x3800e, // vertical-align
+	0x1ad: 0x5af05, // alpha
+	0x1ae: 0x6f309, // max-width
+	0x1af: 0x9708,  // richness
+	0x1b0: 0x3803,  // rgb
+	0x1b1: 0x7d60d, // padding-right
+	0x1b2: 0x29615, // scrollbar-arrow-color
+	0x1b3: 0x16304, // left
+	0x1b5: 0x4a009, // elevation
+	0x1b6: 0x5630a, // line-break
+	0x1ba: 0x27d09, // chocolate
+	0x1bb: 0x9800d, // speak-numeral
+	0x1bd: 0x47f0b, // accelerator
+	0x1be: 0x67709, // limegreen
+	0x1c1: 0x7d08,  // darkcyan
+	0x1c3: 0x6390c, // lightskyblue
+	0x1c5: 0x5c50a, // sans-serif
+	0x1c6: 0x850d,  // border-bottom
+	0x1c7: 0xa,     // background
+	0x1c8: 0xa1006, // volume
+	0x1ca: 0x66b0c, // writing-mode
+	0x1cb: 0x9e18,  // scrollbar-3d-light-color
+	0x1cc: 0x5c006, // widows
+	0x1cf: 0x42809, // font-size
+	0x1d0: 0x15,    // background-position-y
+	0x1d1: 0x5d509, // lightcyan
+	0x1d4: 0x4ec09, // indianred
+	0x1d7: 0x1de0a, // ghostwhite
+	0x1db: 0x78a09, // orangered
+	0x1dc: 0x45c0c, // antiquewhite
+	0x1dd: 0x4da09, // lawngreen
+	0x1df: 0x73b0e, // mediumseagreen
+	0x1e0: 0x20010, // border-top-color
+	0x1e2: 0xf304,  // hsla
+	0x1e4: 0x3250e, // text-transform
+	0x1e6: 0x7160c, // mediumorchid
+	0x1e9: 0x8c709, // monospace
+	0x1ec: 0x94916, // scrollbar-shadow-color
+	0x1ed: 0x79209, // darkgreen
+	0x1ef: 0x25809, // cadetblue
+	0x1f0: 0x59806, // filter
+	0x1f1: 0x1ad12, // border-right-style
+	0x1f6: 0x8440a, // overflow-y
+	0x1f7: 0xd809,  // font-face
+	0x1f8: 0x50d0c, // word-spacing
+	0x1fa: 0xbe13,  // border-bottom-style
+	0x1fb: 0x4380c, // font-stretch
+	0x1fc: 0x7c509, // mintcream
+	0x1fd: 0x88d08, // ime-mode
+	0x1fe: 0x2730a, // chartreuse
+	0x1ff: 0x5ca05, // serif
+}
diff --git a/vendor/github.com/tdewolff/parse/css/hash_test.go b/vendor/github.com/tdewolff/parse/css/hash_test.go
new file mode 100644
index 0000000..e176cc1
--- /dev/null
+++ b/vendor/github.com/tdewolff/parse/css/hash_test.go
@@ -0,0 +1,16 @@
+package css // import "github.com/tdewolff/parse/css"
+
+import (
+	"testing"
+
+	"github.com/tdewolff/test"
+)
+
+func TestHashTable(t *testing.T) {
+	test.T(t, ToHash([]byte("font")), Font, "'font' must resolve to hash.Font")
+	test.T(t, Font.String(), "font")
+	test.T(t, Margin_Left.String(), "margin-left")
+	test.T(t, ToHash([]byte("")), Hash(0), "empty string must resolve to zero")
+	test.T(t, Hash(0xffffff).String(), "")
+	test.T(t, ToHash([]byte("fonts")), Hash(0), "'fonts' must resolve to zero")
+}
diff --git a/vendor/github.com/tdewolff/parse/css/lex.go b/vendor/github.com/tdewolff/parse/css/lex.go
new file mode 100644
index 0000000..3924bb7
--- /dev/null
+++ b/vendor/github.com/tdewolff/parse/css/lex.go
@@ -0,0 +1,710 @@
+// Package css is a CSS3 lexer and parser following the specifications at http://www.w3.org/TR/css-syntax-3/.
+package css // import "github.com/tdewolff/parse/css"
+
+// TODO: \uFFFD replacement character for NULL bytes in strings for example, or atleast don't end the string early
+
+import (
+	"bytes"
+	"io"
+	"strconv"
+
+	"github.com/tdewolff/parse"
+	"github.com/tdewolff/parse/buffer"
+)
+
+// TokenType determines the type of token, eg. a number or a semicolon.
+type TokenType uint32
+
+// TokenType values.
+const (
+	ErrorToken TokenType = iota // extra token when errors occur
+	IdentToken
+	FunctionToken  // rgb( rgba( ...
+	AtKeywordToken // @abc
+	HashToken      // #abc
+	StringToken
+	BadStringToken
+	URLToken
+	BadURLToken
+	DelimToken            // any unmatched character
+	NumberToken           // 5
+	PercentageToken       // 5%
+	DimensionToken        // 5em
+	UnicodeRangeToken     // U+554A
+	IncludeMatchToken     // ~=
+	DashMatchToken        // |=
+	PrefixMatchToken      // ^=
+	SuffixMatchToken      // $=
+	SubstringMatchToken   // *=
+	ColumnToken           // ||
+	WhitespaceToken       // space \t \r \n \f
+	CDOToken              // <!--
+	CDCToken              // -->
+	ColonToken            // :
+	SemicolonToken        // ;
+	CommaToken            // ,
+	LeftBracketToken      // [
+	RightBracketToken     // ]
+	LeftParenthesisToken  // (
+	RightParenthesisToken // )
+	LeftBraceToken        // {
+	RightBraceToken       // }
+	CommentToken          // extra token for comments
+	EmptyToken
+	CustomPropertyNameToken
+	CustomPropertyValueToken
+)
+
+// String returns the string representation of a TokenType.
+func (tt TokenType) String() string {
+	switch tt {
+	case ErrorToken:
+		return "Error"
+	case IdentToken:
+		return "Ident"
+	case FunctionToken:
+		return "Function"
+	case AtKeywordToken:
+		return "AtKeyword"
+	case HashToken:
+		return "Hash"
+	case StringToken:
+		return "String"
+	case BadStringToken:
+		return "BadString"
+	case URLToken:
+		return "URL"
+	case BadURLToken:
+		return "BadURL"
+	case DelimToken:
+		return "Delim"
+	case NumberToken:
+		return "Number"
+	case PercentageToken:
+		return "Percentage"
+	case DimensionToken:
+		return "Dimension"
+	case UnicodeRangeToken:
+		return "UnicodeRange"
+	case IncludeMatchToken:
+		return "IncludeMatch"
+	case DashMatchToken:
+		return "DashMatch"
+	case PrefixMatchToken:
+		return "PrefixMatch"
+	case SuffixMatchToken:
+		return "SuffixMatch"
+	case SubstringMatchToken:
+		return "SubstringMatch"
+	case ColumnToken:
+		return "Column"
+	case WhitespaceToken:
+		return "Whitespace"
+	case CDOToken:
+		return "CDO"
+	case CDCToken:
+		return "CDC"
+	case ColonToken:
+		return "Colon"
+	case SemicolonToken:
+		return "Semicolon"
+	case CommaToken:
+		return "Comma"
+	case LeftBracketToken:
+		return "LeftBracket"
+	case RightBracketToken:
+		return "RightBracket"
+	case LeftParenthesisToken:
+		return "LeftParenthesis"
+	case RightParenthesisToken:
+		return "RightParenthesis"
+	case LeftBraceToken:
+		return "LeftBrace"
+	case RightBraceToken:
+		return "RightBrace"
+	case CommentToken:
+		return "Comment"
+	case EmptyToken:
+		return "Empty"
+	case CustomPropertyNameToken:
+		return "CustomPropertyName"
+	case CustomPropertyValueToken:
+		return "CustomPropertyValue"
+	}
+	return "Invalid(" + strconv.Itoa(int(tt)) + ")"
+}
+
+////////////////////////////////////////////////////////////////
+
+// Lexer is the state for the lexer.
+type Lexer struct {
+	r *buffer.Lexer
+}
+
+// NewLexer returns a new Lexer for a given io.Reader.
+func NewLexer(r io.Reader) *Lexer {
+	return &Lexer{
+		buffer.NewLexer(r),
+	}
+}
+
+// Err returns the error encountered during lexing, this is often io.EOF but also other errors can be returned.
+func (l *Lexer) Err() error {
+	return l.r.Err()
+}
+
+// Restore restores the NULL byte at the end of the buffer.
+func (l *Lexer) Restore() {
+	l.r.Restore()
+}
+
+// Next returns the next Token. It returns ErrorToken when an error was encountered. Using Err() one can retrieve the error message.
+func (l *Lexer) Next() (TokenType, []byte) {
+	switch l.r.Peek(0) {
+	case ' ', '\t', '\n', '\r', '\f':
+		l.r.Move(1)
+		for l.consumeWhitespace() {
+		}
+		return WhitespaceToken, l.r.Shift()
+	case ':':
+		l.r.Move(1)
+		return ColonToken, l.r.Shift()
+	case ';':
+		l.r.Move(1)
+		return SemicolonToken, l.r.Shift()
+	case ',':
+		l.r.Move(1)
+		return CommaToken, l.r.Shift()
+	case '(', ')', '[', ']', '{', '}':
+		if t := l.consumeBracket(); t != ErrorToken {
+			return t, l.r.Shift()
+		}
+	case '#':
+		if l.consumeHashToken() {
+			return HashToken, l.r.Shift()
+		}
+	case '"', '\'':
+		if t := l.consumeString(); t != ErrorToken {
+			return t, l.r.Shift()
+		}
+	case '.', '+':
+		if t := l.consumeNumeric(); t != ErrorToken {
+			return t, l.r.Shift()
+		}
+	case '-':
+		if t := l.consumeNumeric(); t != ErrorToken {
+			return t, l.r.Shift()
+		} else if t := l.consumeIdentlike(); t != ErrorToken {
+			return t, l.r.Shift()
+		} else if l.consumeCDCToken() {
+			return CDCToken, l.r.Shift()
+		} else if l.consumeCustomVariableToken() {
+			return CustomPropertyNameToken, l.r.Shift()
+		}
+	case '@':
+		if l.consumeAtKeywordToken() {
+			return AtKeywordToken, l.r.Shift()
+		}
+	case '$', '*', '^', '~':
+		if t := l.consumeMatch(); t != ErrorToken {
+			return t, l.r.Shift()
+		}
+	case '/':
+		if l.consumeComment() {
+			return CommentToken, l.r.Shift()
+		}
+	case '<':
+		if l.consumeCDOToken() {
+			return CDOToken, l.r.Shift()
+		}
+	case '\\':
+		if t := l.consumeIdentlike(); t != ErrorToken {
+			return t, l.r.Shift()
+		}
+	case 'u', 'U':
+		if l.consumeUnicodeRangeToken() {
+			return UnicodeRangeToken, l.r.Shift()
+		} else if t := l.consumeIdentlike(); t != ErrorToken {
+			return t, l.r.Shift()
+		}
+	case '|':
+		if t := l.consumeMatch(); t != ErrorToken {
+			return t, l.r.Shift()
+		} else if l.consumeColumnToken() {
+			return ColumnToken, l.r.Shift()
+		}
+	case 0:
+		if l.Err() != nil {
+			return ErrorToken, nil
+		}
+	default:
+		if t := l.consumeNumeric(); t != ErrorToken {
+			return t, l.r.Shift()
+		} else if t := l.consumeIdentlike(); t != ErrorToken {
+			return t, l.r.Shift()
+		}
+	}
+	// can't be rune because consumeIdentlike consumes that as an identifier
+	l.r.Move(1)
+	return DelimToken, l.r.Shift()
+}
+
+////////////////////////////////////////////////////////////////
+
+/*
+The following functions follow the railroad diagrams in http://www.w3.org/TR/css3-syntax/
+*/
+
+func (l *Lexer) consumeByte(c byte) bool {
+	if l.r.Peek(0) == c {
+		l.r.Move(1)
+		return true
+	}
+	return false
+}
+
+func (l *Lexer) consumeComment() bool {
+	if l.r.Peek(0) != '/' || l.r.Peek(1) != '*' {
+		return false
+	}
+	l.r.Move(2)
+	for {
+		c := l.r.Peek(0)
+		if c == 0 && l.Err() != nil {
+			break
+		} else if c == '*' && l.r.Peek(1) == '/' {
+			l.r.Move(2)
+			return true
+		}
+		l.r.Move(1)
+	}
+	return true
+}
+
+func (l *Lexer) consumeNewline() bool {
+	c := l.r.Peek(0)
+	if c == '\n' || c == '\f' {
+		l.r.Move(1)
+		return true
+	} else if c == '\r' {
+		if l.r.Peek(1) == '\n' {
+			l.r.Move(2)
+		} else {
+			l.r.Move(1)
+		}
+		return true
+	}
+	return false
+}
+
+func (l *Lexer) consumeWhitespace() bool {
+	c := l.r.Peek(0)
+	if c == ' ' || c == '\t' || c == '\n' || c == '\r' || c == '\f' {
+		l.r.Move(1)
+		return true
+	}
+	return false
+}
+
+func (l *Lexer) consumeDigit() bool {
+	c := l.r.Peek(0)
+	if c >= '0' && c <= '9' {
+		l.r.Move(1)
+		return true
+	}
+	return false
+}
+
+func (l *Lexer) consumeHexDigit() bool {
+	c := l.r.Peek(0)
+	if (c >= '0' && c <= '9') || (c >= 'a' && c <= 'f') || (c >= 'A' && c <= 'F') {
+		l.r.Move(1)
+		return true
+	}
+	return false
+}
+
+func (l *Lexer) consumeEscape() bool {
+	if l.r.Peek(0) != '\\' {
+		return false
+	}
+	mark := l.r.Pos()
+	l.r.Move(1)
+	if l.consumeNewline() {
+		l.r.Rewind(mark)
+		return false
+	} else if l.consumeHexDigit() {
+		for k := 1; k < 6; k++ {
+			if !l.consumeHexDigit() {
+				break
+			}
+		}
+		l.consumeWhitespace()
+		return true
+	} else {
+		c := l.r.Peek(0)
+		if c >= 0xC0 {
+			_, n := l.r.PeekRune(0)
+			l.r.Move(n)
+			return true
+		} else if c == 0 && l.r.Err() != nil {
+			return true
+		}
+	}
+	l.r.Move(1)
+	return true
+}
+
+func (l *Lexer) consumeIdentToken() bool {
+	mark := l.r.Pos()
+	if l.r.Peek(0) == '-' {
+		l.r.Move(1)
+	}
+	c := l.r.Peek(0)
+	if !((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || c == '_' || c >= 0x80) {
+		if c != '\\' || !l.consumeEscape() {
+			l.r.Rewind(mark)
+			return false
+		}
+	} else {
+		l.r.Move(1)
+	}
+	for {
+		c := l.r.Peek(0)
+		if !((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c >= '0' && c <= '9') || c == '_' || c == '-' || c >= 0x80) {
+			if c != '\\' || !l.consumeEscape() {
+				break
+			}
+		} else {
+			l.r.Move(1)
+		}
+	}
+	return true
+}
+
+// support custom variables, https://www.w3.org/TR/css-variables-1/
+func (l *Lexer) consumeCustomVariableToken() bool {
+	// expect to be on a '-'
+	l.r.Move(1)
+	if l.r.Peek(0) != '-' {
+		l.r.Move(-1)
+		return false
+	}
+	if !l.consumeIdentToken() {
+		l.r.Move(-1)
+		return false
+	}
+	return true
+}
+
+func (l *Lexer) consumeAtKeywordToken() bool {
+	// expect to be on an '@'
+	l.r.Move(1)
+	if !l.consumeIdentToken() {
+		l.r.Move(-1)
+		return false
+	}
+	return true
+}
+
+func (l *Lexer) consumeHashToken() bool {
+	// expect to be on a '#'
+	mark := l.r.Pos()
+	l.r.Move(1)
+	c := l.r.Peek(0)
+	if !((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c >= '0' && c <= '9') || c == '_' || c == '-' || c >= 0x80) {
+		if c != '\\' || !l.consumeEscape() {
+			l.r.Rewind(mark)
+			return false
+		}
+	} else {
+		l.r.Move(1)
+	}
+	for {
+		c := l.r.Peek(0)
+		if !((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c >= '0' && c <= '9') || c == '_' || c == '-' || c >= 0x80) {
+			if c != '\\' || !l.consumeEscape() {
+				break
+			}
+		} else {
+			l.r.Move(1)
+		}
+	}
+	return true
+}
+
+func (l *Lexer) consumeNumberToken() bool {
+	mark := l.r.Pos()
+	c := l.r.Peek(0)
+	if c == '+' || c == '-' {
+		l.r.Move(1)
+	}
+	firstDigit := l.consumeDigit()
+	if firstDigit {
+		for l.consumeDigit() {
+		}
+	}
+	if l.r.Peek(0) == '.' {
+		l.r.Move(1)
+		if l.consumeDigit() {
+			for l.consumeDigit() {
+			}
+		} else if firstDigit {
+			// . could belong to the next token
+			l.r.Move(-1)
+			return true
+		} else {
+			l.r.Rewind(mark)
+			return false
+		}
+	} else if !firstDigit {
+		l.r.Rewind(mark)
+		return false
+	}
+	mark = l.r.Pos()
+	c = l.r.Peek(0)
+	if c == 'e' || c == 'E' {
+		l.r.Move(1)
+		c = l.r.Peek(0)
+		if c == '+' || c == '-' {
+			l.r.Move(1)
+		}
+		if !l.consumeDigit() {
+			// e could belong to next token
+			l.r.Rewind(mark)
+			return true
+		}
+		for l.consumeDigit() {
+		}
+	}
+	return true
+}
+
+func (l *Lexer) consumeUnicodeRangeToken() bool {
+	c := l.r.Peek(0)
+	if (c != 'u' && c != 'U') || l.r.Peek(1) != '+' {
+		return false
+	}
+	mark := l.r.Pos()
+	l.r.Move(2)
+	if l.consumeHexDigit() {
+		// consume up to 6 hexDigits
+		k := 1
+		for ; k < 6; k++ {
+			if !l.consumeHexDigit() {
+				break
+			}
+		}
+
+		// either a minus or a question mark or the end is expected
+		if l.consumeByte('-') {
+			// consume another up to 6 hexDigits
+			if l.consumeHexDigit() {
+				for k := 1; k < 6; k++ {
+					if !l.consumeHexDigit() {
+						break
+					}
+				}
+			} else {
+				l.r.Rewind(mark)
+				return false
+			}
+		} else {
+			// could be filled up to 6 characters with question marks or else regular hexDigits
+			if l.consumeByte('?') {
+				k++
+				for ; k < 6; k++ {
+					if !l.consumeByte('?') {
+						l.r.Rewind(mark)
+						return false
+					}
+				}
+			}
+		}
+	} else {
+		// consume 6 question marks
+		for k := 0; k < 6; k++ {
+			if !l.consumeByte('?') {
+				l.r.Rewind(mark)
+				return false
+			}
+		}
+	}
+	return true
+}
+
+func (l *Lexer) consumeColumnToken() bool {
+	if l.r.Peek(0) == '|' && l.r.Peek(1) == '|' {
+		l.r.Move(2)
+		return true
+	}
+	return false
+}
+
+func (l *Lexer) consumeCDOToken() bool {
+	if l.r.Peek(0) == '<' && l.r.Peek(1) == '!' && l.r.Peek(2) == '-' && l.r.Peek(3) == '-' {
+		l.r.Move(4)
+		return true
+	}
+	return false
+}
+
+func (l *Lexer) consumeCDCToken() bool {
+	if l.r.Peek(0) == '-' && l.r.Peek(1) == '-' && l.r.Peek(2) == '>' {
+		l.r.Move(3)
+		return true
+	}
+	return false
+}
+
+////////////////////////////////////////////////////////////////
+
+// consumeMatch consumes any MatchToken.
+func (l *Lexer) consumeMatch() TokenType {
+	if l.r.Peek(1) == '=' {
+		switch l.r.Peek(0) {
+		case '~':
+			l.r.Move(2)
+			return IncludeMatchToken
+		case '|':
+			l.r.Move(2)
+			return DashMatchToken
+		case '^':
+			l.r.Move(2)
+			return PrefixMatchToken
+		case '$':
+			l.r.Move(2)
+			return SuffixMatchToken
+		case '*':
+			l.r.Move(2)
+			return SubstringMatchToken
+		}
+	}
+	return ErrorToken
+}
+
+// consumeBracket consumes any bracket token.
+func (l *Lexer) consumeBracket() TokenType {
+	switch l.r.Peek(0) {
+	case '(':
+		l.r.Move(1)
+		return LeftParenthesisToken
+	case ')':
+		l.r.Move(1)
+		return RightParenthesisToken
+	case '[':
+		l.r.Move(1)
+		return LeftBracketToken
+	case ']':
+		l.r.Move(1)
+		return RightBracketToken
+	case '{':
+		l.r.Move(1)
+		return LeftBraceToken
+	case '}':
+		l.r.Move(1)
+		return RightBraceToken
+	}
+	return ErrorToken
+}
+
+// consumeNumeric consumes NumberToken, PercentageToken or DimensionToken.
+func (l *Lexer) consumeNumeric() TokenType {
+	if l.consumeNumberToken() {
+		if l.consumeByte('%') {
+			return PercentageToken
+		} else if l.consumeIdentToken() {
+			return DimensionToken
+		}
+		return NumberToken
+	}
+	return ErrorToken
+}
+
+// consumeString consumes a string and may return BadStringToken when a newline is encountered.
+func (l *Lexer) consumeString() TokenType {
+	// assume to be on " or '
+	delim := l.r.Peek(0)
+	l.r.Move(1)
+	for {
+		c := l.r.Peek(0)
+		if c == 0 && l.Err() != nil {
+			break
+		} else if c == '\n' || c == '\r' || c == '\f' {
+			l.r.Move(1)
+			return BadStringToken
+		} else if c == delim {
+			l.r.Move(1)
+			break
+		} else if c == '\\' {
+			if !l.consumeEscape() {
+				l.r.Move(1)
+				l.consumeNewline()
+			}
+		} else {
+			l.r.Move(1)
+		}
+	}
+	return StringToken
+}
+
+func (l *Lexer) consumeUnquotedURL() bool {
+	for {
+		c := l.r.Peek(0)
+		if c == 0 && l.Err() != nil || c == ')' {
+			break
+		} else if c == '"' || c == '\'' || c == '(' || c == '\\' || c == ' ' || c <= 0x1F || c == 0x7F {
+			if c != '\\' || !l.consumeEscape() {
+				return false
+			}
+		} else {
+			l.r.Move(1)
+		}
+	}
+	return true
+}
+
+// consumeRemnantsBadUrl consumes bytes of a BadUrlToken so that normal tokenization may continue.
+func (l *Lexer) consumeRemnantsBadURL() {
+	for {
+		if l.consumeByte(')') || l.Err() != nil {
+			break
+		} else if !l.consumeEscape() {
+			l.r.Move(1)
+		}
+	}
+}
+
+// consumeIdentlike consumes IdentToken, FunctionToken or UrlToken.
+func (l *Lexer) consumeIdentlike() TokenType {
+	if l.consumeIdentToken() {
+		if l.r.Peek(0) != '(' {
+			return IdentToken
+		} else if !parse.EqualFold(bytes.Replace(l.r.Lexeme(), []byte{'\\'}, nil, -1), []byte{'u', 'r', 'l'}) {
+			l.r.Move(1)
+			return FunctionToken
+		}
+		l.r.Move(1)
+
+		// consume url
+		for l.consumeWhitespace() {
+		}
+		if c := l.r.Peek(0); c == '"' || c == '\'' {
+			if l.consumeString() == BadStringToken {
+				l.consumeRemnantsBadURL()
+				return BadURLToken
+			}
+		} else if !l.consumeUnquotedURL() && !l.consumeWhitespace() {
+			l.consumeRemnantsBadURL()
+			return BadURLToken
+		}
+		for l.consumeWhitespace() {
+		}
+		if !l.consumeByte(')') && l.Err() != io.EOF {
+			l.consumeRemnantsBadURL()
+			return BadURLToken
+		}
+		return URLToken
+	}
+	return ErrorToken
+}
diff --git a/vendor/github.com/tdewolff/parse/css/lex_test.go b/vendor/github.com/tdewolff/parse/css/lex_test.go
new file mode 100644
index 0000000..0bdc891
--- /dev/null
+++ b/vendor/github.com/tdewolff/parse/css/lex_test.go
@@ -0,0 +1,143 @@
+package css // import "github.com/tdewolff/parse/css"
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"testing"
+
+	"github.com/tdewolff/test"
+)
+
+type TTs []TokenType
+
+func TestTokens(t *testing.T) {
+	var tokenTests = []struct {
+		css      string
+		expected []TokenType
+	}{
+		{" ", TTs{}},
+		{"5.2 .4", TTs{NumberToken, NumberToken}},
+		{"color: red;", TTs{IdentToken, ColonToken, IdentToken, SemicolonToken}},
+		{"background: url(\"http://x\");", TTs{IdentToken, ColonToken, URLToken, SemicolonToken}},
+		{"background: URL(x.png);", TTs{IdentToken, ColonToken, URLToken, SemicolonToken}},
+		{"color: rgb(4, 0%, 5em);", TTs{IdentToken, ColonToken, FunctionToken, NumberToken, CommaToken, PercentageToken, CommaToken, DimensionToken, RightParenthesisToken, SemicolonToken}},
+		{"body { \"string\" }", TTs{IdentToken, LeftBraceToken, StringToken, RightBraceToken}},
+		{"body { \"str\\\"ing\" }", TTs{IdentToken, LeftBraceToken, StringToken, RightBraceToken}},
+		{".class { }", TTs{DelimToken, IdentToken, LeftBraceToken, RightBraceToken}},
+		{"#class { }", TTs{HashToken, LeftBraceToken, RightBraceToken}},
+		{"#class\\#withhash { }", TTs{HashToken, LeftBraceToken, RightBraceToken}},
+		{"@media print { }", TTs{AtKeywordToken, IdentToken, LeftBraceToken, RightBraceToken}},
+		{"/*comment*/", TTs{CommentToken}},
+		{"/*com* /ment*/", TTs{CommentToken}},
+		{"~= |= ^= $= *=", TTs{IncludeMatchToken, DashMatchToken, PrefixMatchToken, SuffixMatchToken, SubstringMatchToken}},
+		{"||", TTs{ColumnToken}},
+		{"<!-- -->", TTs{CDOToken, CDCToken}},
+		{"U+1234", TTs{UnicodeRangeToken}},
+		{"5.2 .4 4e-22", TTs{NumberToken, NumberToken, NumberToken}},
+		{"--custom-variable", TTs{CustomPropertyNameToken}},
+
+		// unexpected ending
+		{"ident", TTs{IdentToken}},
+		{"123.", TTs{NumberToken, DelimToken}},
+		{"\"string", TTs{StringToken}},
+		{"123/*comment", TTs{NumberToken, CommentToken}},
+		{"U+1-", TTs{IdentToken, NumberToken, DelimToken}},
+
+		// unicode
+		{"fooδbar􀀀", TTs{IdentToken}},
+		{"foo\\æ\\†", TTs{IdentToken}},
+		// {"foo\x00bar", TTs{IdentToken}},
+		{"'foo\u554abar'", TTs{StringToken}},
+		{"\\000026B", TTs{IdentToken}},
+		{"\\26 B", TTs{IdentToken}},
+
+		// hacks
+		{`\-\mo\z\-b\i\nd\in\g:\url(//business\i\nfo.co.uk\/labs\/xbl\/xbl\.xml\#xss);`, TTs{IdentToken, ColonToken, URLToken, SemicolonToken}},
+		{"width/**/:/**/ 40em;", TTs{IdentToken, CommentToken, ColonToken, CommentToken, DimensionToken, SemicolonToken}},
+		{":root *> #quince", TTs{ColonToken, IdentToken, DelimToken, DelimToken, HashToken}},
+		{"html[xmlns*=\"\"]:root", TTs{IdentToken, LeftBracketToken, IdentToken, SubstringMatchToken, StringToken, RightBracketToken, ColonToken, IdentToken}},
+		{"body:nth-of-type(1)", TTs{IdentToken, ColonToken, FunctionToken, NumberToken, RightParenthesisToken}},
+		{"color/*\\**/: blue\\9;", TTs{IdentToken, CommentToken, ColonToken, IdentToken, SemicolonToken}},
+		{"color: blue !ie;", TTs{IdentToken, ColonToken, IdentToken, DelimToken, IdentToken, SemicolonToken}},
+
+		// escapes, null and replacement character
+		{"c\\\x00olor: white;", TTs{IdentToken, ColonToken, IdentToken, SemicolonToken}},
+		{"null\\0", TTs{IdentToken}},
+		{"eof\\", TTs{IdentToken}},
+		{"\"a\x00b\"", TTs{StringToken}},
+		{"a\\\x00b", TTs{IdentToken}},
+		{"url(a\x00b)", TTs{BadURLToken}}, // null character cannot be unquoted
+		{"/*a\x00b*/", TTs{CommentToken}},
+
+		// coverage
+		{"  \n\r\n\r\"\\\r\n\\\r\"", TTs{StringToken}},
+		{"U+?????? U+ABCD?? U+ABC-DEF", TTs{UnicodeRangeToken, UnicodeRangeToken, UnicodeRangeToken}},
+		{"U+? U+A?", TTs{IdentToken, DelimToken, DelimToken, IdentToken, DelimToken, IdentToken, DelimToken}},
+		{"-5.23 -moz", TTs{NumberToken, IdentToken}},
+		{"()", TTs{LeftParenthesisToken, RightParenthesisToken}},
+		{"url( //url  )", TTs{URLToken}},
+		{"url( ", TTs{URLToken}},
+		{"url( //url", TTs{URLToken}},
+		{"url(\")a", TTs{URLToken}},
+		{"url(a'\\\n)a", TTs{BadURLToken, IdentToken}},
+		{"url(\"\n)a", TTs{BadURLToken, IdentToken}},
+		{"url(a h)a", TTs{BadURLToken, IdentToken}},
+		{"<!- | @4 ## /2", TTs{DelimToken, DelimToken, DelimToken, DelimToken, DelimToken, NumberToken, DelimToken, DelimToken, DelimToken, NumberToken}},
+		{"\"s\\\n\"", TTs{StringToken}},
+		{"\"a\\\"b\"", TTs{StringToken}},
+		{"\"s\n", TTs{BadStringToken}},
+
+		// small
+		{"\"abcd", TTs{StringToken}},
+		{"/*comment", TTs{CommentToken}},
+		{"U+A-B", TTs{UnicodeRangeToken}},
+		{"url((", TTs{BadURLToken}},
+		{"id\u554a", TTs{IdentToken}},
+	}
+	for _, tt := range tokenTests {
+		t.Run(tt.css, func(t *testing.T) {
+			l := NewLexer(bytes.NewBufferString(tt.css))
+			i := 0
+			for {
+				token, _ := l.Next()
+				if token == ErrorToken {
+					test.T(t, l.Err(), io.EOF)
+					test.T(t, i, len(tt.expected), "when error occurred we must be at the end")
+					break
+				} else if token == WhitespaceToken {
+					continue
+				}
+				test.That(t, i < len(tt.expected), "index", i, "must not exceed expected token types size", len(tt.expected))
+				if i < len(tt.expected) {
+					test.T(t, token, tt.expected[i], "token types must match")
+				}
+				i++
+			}
+		})
+	}
+
+	test.T(t, WhitespaceToken.String(), "Whitespace")
+	test.T(t, EmptyToken.String(), "Empty")
+	test.T(t, CustomPropertyValueToken.String(), "CustomPropertyValue")
+	test.T(t, TokenType(100).String(), "Invalid(100)")
+	test.T(t, NewLexer(bytes.NewBufferString("x")).consumeBracket(), ErrorToken, "consumeBracket on 'x' must return error")
+}
+
+////////////////////////////////////////////////////////////////
+
+func ExampleNewLexer() {
+	l := NewLexer(bytes.NewBufferString("color: red;"))
+	out := ""
+	for {
+		tt, data := l.Next()
+		if tt == ErrorToken {
+			break
+		} else if tt == WhitespaceToken || tt == CommentToken {
+			continue
+		}
+		out += string(data)
+	}
+	fmt.Println(out)
+	// Output: color:red;
+}
diff --git a/vendor/github.com/tdewolff/parse/css/parse.go b/vendor/github.com/tdewolff/parse/css/parse.go
new file mode 100644
index 0000000..e48cd66
--- /dev/null
+++ b/vendor/github.com/tdewolff/parse/css/parse.go
@@ -0,0 +1,398 @@
+package css // import "github.com/tdewolff/parse/css"
+
+import (
+	"bytes"
+	"io"
+	"strconv"
+
+	"github.com/tdewolff/parse"
+)
+
+var wsBytes = []byte(" ")
+var endBytes = []byte("}")
+var emptyBytes = []byte("")
+
+// GrammarType determines the type of grammar.
+type GrammarType uint32
+
+// GrammarType values.
+const (
+	ErrorGrammar GrammarType = iota // extra token when errors occur
+	CommentGrammar
+	AtRuleGrammar
+	BeginAtRuleGrammar
+	EndAtRuleGrammar
+	QualifiedRuleGrammar
+	BeginRulesetGrammar
+	EndRulesetGrammar
+	DeclarationGrammar
+	TokenGrammar
+	CustomPropertyGrammar
+)
+
+// String returns the string representation of a GrammarType.
+func (tt GrammarType) String() string {
+	switch tt {
+	case ErrorGrammar:
+		return "Error"
+	case CommentGrammar:
+		return "Comment"
+	case AtRuleGrammar:
+		return "AtRule"
+	case BeginAtRuleGrammar:
+		return "BeginAtRule"
+	case EndAtRuleGrammar:
+		return "EndAtRule"
+	case QualifiedRuleGrammar:
+		return "QualifiedRule"
+	case BeginRulesetGrammar:
+		return "BeginRuleset"
+	case EndRulesetGrammar:
+		return "EndRuleset"
+	case DeclarationGrammar:
+		return "Declaration"
+	case TokenGrammar:
+		return "Token"
+	case CustomPropertyGrammar:
+		return "CustomProperty"
+	}
+	return "Invalid(" + strconv.Itoa(int(tt)) + ")"
+}
+
+////////////////////////////////////////////////////////////////
+
+// State is the state function the parser currently is in.
+type State func(*Parser) GrammarType
+
+// Token is a single TokenType and its associated data.
+type Token struct {
+	TokenType
+	Data []byte
+}
+
+// Parser is the state for the parser.
+type Parser struct {
+	l     *Lexer
+	state []State
+	err   error
+
+	buf   []Token
+	level int
+
+	tt      TokenType
+	data    []byte
+	prevWS  bool
+	prevEnd bool
+}
+
+// NewParser returns a new CSS parser from an io.Reader. isInline specifies whether this is an inline style attribute.
+func NewParser(r io.Reader, isInline bool) *Parser {
+	l := NewLexer(r)
+	p := &Parser{
+		l:     l,
+		state: make([]State, 0, 4),
+	}
+
+	if isInline {
+		p.state = append(p.state, (*Parser).parseDeclarationList)
+	} else {
+		p.state = append(p.state, (*Parser).parseStylesheet)
+	}
+	return p
+}
+
+// Err returns the error encountered during parsing, this is often io.EOF but also other errors can be returned.
+func (p *Parser) Err() error {
+	if p.err != nil {
+		return p.err
+	}
+	return p.l.Err()
+}
+
+// Restore restores the NULL byte at the end of the buffer.
+func (p *Parser) Restore() {
+	p.l.Restore()
+}
+
+// Next returns the next Grammar. It returns ErrorGrammar when an error was encountered. Using Err() one can retrieve the error message.
+func (p *Parser) Next() (GrammarType, TokenType, []byte) {
+	p.err = nil
+
+	if p.prevEnd {
+		p.tt, p.data = RightBraceToken, endBytes
+		p.prevEnd = false
+	} else {
+		p.tt, p.data = p.popToken(true)
+	}
+	gt := p.state[len(p.state)-1](p)
+	return gt, p.tt, p.data
+}
+
+// Values returns a slice of Tokens for the last Grammar. Only AtRuleGrammar, BeginAtRuleGrammar, BeginRulesetGrammar and Declaration will return the at-rule components, ruleset selector and declaration values respectively.
+func (p *Parser) Values() []Token {
+	return p.buf
+}
+
+func (p *Parser) popToken(allowComment bool) (TokenType, []byte) {
+	p.prevWS = false
+	tt, data := p.l.Next()
+	for tt == WhitespaceToken || tt == CommentToken {
+		if tt == WhitespaceToken {
+			p.prevWS = true
+		} else if allowComment && len(p.state) == 1 {
+			break
+		}
+		tt, data = p.l.Next()
+	}
+	return tt, data
+}
+
+func (p *Parser) initBuf() {
+	p.buf = p.buf[:0]
+}
+
+func (p *Parser) pushBuf(tt TokenType, data []byte) {
+	p.buf = append(p.buf, Token{tt, data})
+}
+
+////////////////////////////////////////////////////////////////
+
+func (p *Parser) parseStylesheet() GrammarType {
+	if p.tt == CDOToken || p.tt == CDCToken {
+		return TokenGrammar
+	} else if p.tt == AtKeywordToken {
+		return p.parseAtRule()
+	} else if p.tt == CommentToken {
+		return CommentGrammar
+	} else if p.tt == ErrorToken {
+		return ErrorGrammar
+	}
+	return p.parseQualifiedRule()
+}
+
+func (p *Parser) parseDeclarationList() GrammarType {
+	if p.tt == CommentToken {
+		p.tt, p.data = p.popToken(false)
+	}
+	for p.tt == SemicolonToken {
+		p.tt, p.data = p.popToken(false)
+	}
+	if p.tt == ErrorToken {
+		return ErrorGrammar
+	} else if p.tt == AtKeywordToken {
+		return p.parseAtRule()
+	} else if p.tt == IdentToken {
+		return p.parseDeclaration()
+	} else if p.tt == CustomPropertyNameToken {
+		return p.parseCustomProperty()
+	}
+
+	// parse error
+	p.initBuf()
+	p.err = parse.NewErrorLexer("unexpected token in declaration", p.l.r)
+	for {
+		tt, data := p.popToken(false)
+		if (tt == SemicolonToken || tt == RightBraceToken) && p.level == 0 || tt == ErrorToken {
+			p.prevEnd = (tt == RightBraceToken)
+			return ErrorGrammar
+		}
+		p.pushBuf(tt, data)
+	}
+}
+
+////////////////////////////////////////////////////////////////
+
+func (p *Parser) parseAtRule() GrammarType {
+	p.initBuf()
+	parse.ToLower(p.data)
+	atRuleName := p.data
+	if len(atRuleName) > 0 && atRuleName[1] == '-' {
+		if i := bytes.IndexByte(atRuleName[2:], '-'); i != -1 {
+			atRuleName = atRuleName[i+2:] // skip vendor specific prefix
+		}
+	}
+	atRule := ToHash(atRuleName[1:])
+
+	first := true
+	skipWS := false
+	for {
+		tt, data := p.popToken(false)
+		if tt == LeftBraceToken && p.level == 0 {
+			if atRule == Font_Face || atRule == Page {
+				p.state = append(p.state, (*Parser).parseAtRuleDeclarationList)
+			} else if atRule == Document || atRule == Keyframes || atRule == Media || atRule == Supports {
+				p.state = append(p.state, (*Parser).parseAtRuleRuleList)
+			} else {
+				p.state = append(p.state, (*Parser).parseAtRuleUnknown)
+			}
+			return BeginAtRuleGrammar
+		} else if (tt == SemicolonToken || tt == RightBraceToken) && p.level == 0 || tt == ErrorToken {
+			p.prevEnd = (tt == RightBraceToken)
+			return AtRuleGrammar
+		} else if tt == LeftParenthesisToken || tt == LeftBraceToken || tt == LeftBracketToken || tt == FunctionToken {
+			p.level++
+		} else if tt == RightParenthesisToken || tt == RightBraceToken || tt == RightBracketToken {
+			p.level--
+		}
+		if first {
+			if tt == LeftParenthesisToken || tt == LeftBracketToken {
+				p.prevWS = false
+			}
+			first = false
+		}
+		if len(data) == 1 && (data[0] == ',' || data[0] == ':') {
+			skipWS = true
+		} else if p.prevWS && !skipWS && tt != RightParenthesisToken {
+			p.pushBuf(WhitespaceToken, wsBytes)
+		} else {
+			skipWS = false
+		}
+		if tt == LeftParenthesisToken {
+			skipWS = true
+		}
+		p.pushBuf(tt, data)
+	}
+}
+
+func (p *Parser) parseAtRuleRuleList() GrammarType {
+	if p.tt == RightBraceToken || p.tt == ErrorToken {
+		p.state = p.state[:len(p.state)-1]
+		return EndAtRuleGrammar
+	} else if p.tt == AtKeywordToken {
+		return p.parseAtRule()
+	} else {
+		return p.parseQualifiedRule()
+	}
+}
+
+func (p *Parser) parseAtRuleDeclarationList() GrammarType {
+	for p.tt == SemicolonToken {
+		p.tt, p.data = p.popToken(false)
+	}
+	if p.tt == RightBraceToken || p.tt == ErrorToken {
+		p.state = p.state[:len(p.state)-1]
+		return EndAtRuleGrammar
+	}
+	return p.parseDeclarationList()
+}
+
+func (p *Parser) parseAtRuleUnknown() GrammarType {
+	if p.tt == RightBraceToken && p.level == 0 || p.tt == ErrorToken {
+		p.state = p.state[:len(p.state)-1]
+		return EndAtRuleGrammar
+	}
+	if p.tt == LeftParenthesisToken || p.tt == LeftBraceToken || p.tt == LeftBracketToken || p.tt == FunctionToken {
+		p.level++
+	} else if p.tt == RightParenthesisToken || p.tt == RightBraceToken || p.tt == RightBracketToken {
+		p.level--
+	}
+	return TokenGrammar
+}
+
+func (p *Parser) parseQualifiedRule() GrammarType {
+	p.initBuf()
+	first := true
+	inAttrSel := false
+	skipWS := true
+	var tt TokenType
+	var data []byte
+	for {
+		if first {
+			tt, data = p.tt, p.data
+			p.tt = WhitespaceToken
+			p.data = emptyBytes
+			first = false
+		} else {
+			tt, data = p.popToken(false)
+		}
+		if tt == LeftBraceToken && p.level == 0 {
+			p.state = append(p.state, (*Parser).parseQualifiedRuleDeclarationList)
+			return BeginRulesetGrammar
+		} else if tt == ErrorToken {
+			p.err = parse.NewErrorLexer("unexpected ending in qualified rule, expected left brace token", p.l.r)
+			return ErrorGrammar
+		} else if tt == LeftParenthesisToken || tt == LeftBraceToken || tt == LeftBracketToken || tt == FunctionToken {
+			p.level++
+		} else if tt == RightParenthesisToken || tt == RightBraceToken || tt == RightBracketToken {
+			p.level--
+		}
+		if len(data) == 1 && (data[0] == ',' || data[0] == '>' || data[0] == '+' || data[0] == '~') {
+			if data[0] == ',' {
+				return QualifiedRuleGrammar
+			}
+			skipWS = true
+		} else if p.prevWS && !skipWS && !inAttrSel {
+			p.pushBuf(WhitespaceToken, wsBytes)
+		} else {
+			skipWS = false
+		}
+		if tt == LeftBracketToken {
+			inAttrSel = true
+		} else if tt == RightBracketToken {
+			inAttrSel = false
+		}
+		p.pushBuf(tt, data)
+	}
+}
+
+func (p *Parser) parseQualifiedRuleDeclarationList() GrammarType {
+	for p.tt == SemicolonToken {
+		p.tt, p.data = p.popToken(false)
+	}
+	if p.tt == RightBraceToken || p.tt == ErrorToken {
+		p.state = p.state[:len(p.state)-1]
+		return EndRulesetGrammar
+	}
+	return p.parseDeclarationList()
+}
+
+func (p *Parser) parseDeclaration() GrammarType {
+	p.initBuf()
+	parse.ToLower(p.data)
+	if tt, _ := p.popToken(false); tt != ColonToken {
+		p.err = parse.NewErrorLexer("unexpected token in declaration", p.l.r)
+		return ErrorGrammar
+	}
+	skipWS := true
+	for {
+		tt, data := p.popToken(false)
+		if (tt == SemicolonToken || tt == RightBraceToken) && p.level == 0 || tt == ErrorToken {
+			p.prevEnd = (tt == RightBraceToken)
+			return DeclarationGrammar
+		} else if tt == LeftParenthesisToken || tt == LeftBraceToken || tt == LeftBracketToken || tt == FunctionToken {
+			p.level++
+		} else if tt == RightParenthesisToken || tt == RightBraceToken || tt == RightBracketToken {
+			p.level--
+		}
+		if len(data) == 1 && (data[0] == ',' || data[0] == '/' || data[0] == ':' || data[0] == '!' || data[0] == '=') {
+			skipWS = true
+		} else if p.prevWS && !skipWS {
+			p.pushBuf(WhitespaceToken, wsBytes)
+		} else {
+			skipWS = false
+		}
+		p.pushBuf(tt, data)
+	}
+}
+
+func (p *Parser) parseCustomProperty() GrammarType {
+	p.initBuf()
+	if tt, _ := p.popToken(false); tt != ColonToken {
+		p.err = parse.NewErrorLexer("unexpected token in declaration", p.l.r)
+		return ErrorGrammar
+	}
+	val := []byte{}
+	for {
+		tt, data := p.l.Next()
+		if (tt == SemicolonToken || tt == RightBraceToken) && p.level == 0 || tt == ErrorToken {
+			p.prevEnd = (tt == RightBraceToken)
+			p.pushBuf(CustomPropertyValueToken, val)
+			return CustomPropertyGrammar
+		} else if tt == LeftParenthesisToken || tt == LeftBraceToken || tt == LeftBracketToken || tt == FunctionToken {
+			p.level++
+		} else if tt == RightParenthesisToken || tt == RightBraceToken || tt == RightBracketToken {
+			p.level--
+		}
+		val = append(val, data...)
+	}
+}
diff --git a/vendor/github.com/tdewolff/parse/css/parse_test.go b/vendor/github.com/tdewolff/parse/css/parse_test.go
new file mode 100644
index 0000000..33f6f5f
--- /dev/null
+++ b/vendor/github.com/tdewolff/parse/css/parse_test.go
@@ -0,0 +1,248 @@
+package css // import "github.com/tdewolff/parse/css"
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"testing"
+
+	"github.com/tdewolff/parse"
+	"github.com/tdewolff/test"
+)
+
+////////////////////////////////////////////////////////////////
+
+func TestParse(t *testing.T) {
+	var parseTests = []struct {
+		inline   bool
+		css      string
+		expected string
+	}{
+		{true, " x : y ; ", "x:y;"},
+		{true, "color: red;", "color:red;"},
+		{true, "color : red;", "color:red;"},
+		{true, "color: red; border: 0;", "color:red;border:0;"},
+		{true, "color: red !important;", "color:red!important;"},
+		{true, "color: red ! important;", "color:red!important;"},
+		{true, "white-space: -moz-pre-wrap;", "white-space:-moz-pre-wrap;"},
+		{true, "display: -moz-inline-stack;", "display:-moz-inline-stack;"},
+		{true, "x: 10px / 1em;", "x:10px/1em;"},
+		{true, "x: 1em/1.5em \"Times New Roman\", Times, serif;", "x:1em/1.5em \"Times New Roman\",Times,serif;"},
+		{true, "x: hsla(100,50%, 75%, 0.5);", "x:hsla(100,50%,75%,0.5);"},
+		{true, "x: hsl(100,50%, 75%);", "x:hsl(100,50%,75%);"},
+		{true, "x: rgba(255, 238 , 221, 0.3);", "x:rgba(255,238,221,0.3);"},
+		{true, "x: 50vmax;", "x:50vmax;"},
+		{true, "color: linear-gradient(to right, black, white);", "color:linear-gradient(to right,black,white);"},
+		{true, "color: calc(100%/2 - 1em);", "color:calc(100%/2 - 1em);"},
+		{true, "color: calc(100%/2--1em);", "color:calc(100%/2--1em);"},
+		{false, "<!-- @charset; -->", "<!--@charset;-->"},
+		{false, "@media print, screen { }", "@media print,screen{}"},
+		{false, "@media { @viewport ; }", "@media{@viewport;}"},
+		{false, "@keyframes 'diagonal-slide' {  from { left: 0; top: 0; } to { left: 100px; top: 100px; } }", "@keyframes 'diagonal-slide'{from{left:0;top:0;}to{left:100px;top:100px;}}"},
+		{false, "@keyframes movingbox{0%{left:90%;}50%{left:10%;}100%{left:90%;}}", "@keyframes movingbox{0%{left:90%;}50%{left:10%;}100%{left:90%;}}"},
+		{false, ".foo { color: #fff;}", ".foo{color:#fff;}"},
+		{false, ".foo { ; _color: #fff;}", ".foo{_color:#fff;}"},
+		{false, "a { color: red; border: 0; }", "a{color:red;border:0;}"},
+		{false, "a { color: red; border: 0; } b { padding: 0; }", "a{color:red;border:0;}b{padding:0;}"},
+		{false, "/* comment */", "/* comment */"},
+
+		// extraordinary
+		{true, "color: red;;", "color:red;"},
+		{true, "color:#c0c0c0", "color:#c0c0c0;"},
+		{true, "background:URL(x.png);", "background:URL(x.png);"},
+		{true, "filter: progid : DXImageTransform.Microsoft.BasicImage(rotation=1);", "filter:progid:DXImageTransform.Microsoft.BasicImage(rotation=1);"},
+		{true, "/*a*/\n/*c*/\nkey: value;", "key:value;"},
+		{true, "@-moz-charset;", "@-moz-charset;"},
+		{true, "--custom-variable:  (0;)  ;", "--custom-variable:  (0;)  ;"},
+		{false, "@import;@import;", "@import;@import;"},
+		{false, ".a .b#c, .d<.e { x:y; }", ".a .b#c,.d<.e{x:y;}"},
+		{false, ".a[b~=c]d { x:y; }", ".a[b~=c]d{x:y;}"},
+		// {false, "{x:y;}", "{x:y;}"},
+		{false, "a{}", "a{}"},
+		{false, "a,.b/*comment*/ {x:y;}", "a,.b{x:y;}"},
+		{false, "a,.b/*comment*/.c {x:y;}", "a,.b.c{x:y;}"},
+		{false, "a{x:; z:q;}", "a{x:;z:q;}"},
+		{false, "@font-face { x:y; }", "@font-face{x:y;}"},
+		{false, "a:not([controls]){x:y;}", "a:not([controls]){x:y;}"},
+		{false, "@document regexp('https:.*') { p { color: red; } }", "@document regexp('https:.*'){p{color:red;}}"},
+		{false, "@media all and ( max-width:400px ) { }", "@media all and (max-width:400px){}"},
+		{false, "@media (max-width:400px) { }", "@media(max-width:400px){}"},
+		{false, "@media (max-width:400px)", "@media(max-width:400px);"},
+		{false, "@font-face { ; font:x; }", "@font-face{font:x;}"},
+		{false, "@-moz-font-face { ; font:x; }", "@-moz-font-face{font:x;}"},
+		{false, "@unknown abc { {} lala }", "@unknown abc{{}lala}"},
+		{false, "a[x={}]{x:y;}", "a[x={}]{x:y;}"},
+		{false, "a[x=,]{x:y;}", "a[x=,]{x:y;}"},
+		{false, "a[x=+]{x:y;}", "a[x=+]{x:y;}"},
+		{false, ".cla .ss > #id { x:y; }", ".cla .ss>#id{x:y;}"},
+		{false, ".cla /*a*/ /*b*/ .ss{}", ".cla .ss{}"},
+		{false, "a{x:f(a(),b);}", "a{x:f(a(),b);}"},
+		{false, "a{x:y!z;}", "a{x:y!z;}"},
+		{false, "[class*=\"column\"]+[class*=\"column\"]:last-child{a:b;}", "[class*=\"column\"]+[class*=\"column\"]:last-child{a:b;}"},
+		{false, "@media { @viewport }", "@media{@viewport;}"},
+		{false, "table { @unknown }", "table{@unknown;}"},
+
+		// early endings
+		{false, "selector{", "selector{"},
+		{false, "@media{selector{", "@media{selector{"},
+
+		// bad grammar
+		{true, "~color:red", "~color:red;"},
+		{false, ".foo { *color: #fff;}", ".foo{*color:#fff;}"},
+		{true, "*color: red; font-size: 12pt;", "*color:red;font-size:12pt;"},
+		{true, "_color: red; font-size: 12pt;", "_color:red;font-size:12pt;"},
+
+		// issues
+		{false, "@media print {.class{width:5px;}}", "@media print{.class{width:5px;}}"},                  // #6
+		{false, ".class{width:calc((50% + 2em)/2 + 14px);}", ".class{width:calc((50% + 2em)/2 + 14px);}"}, // #7
+		{false, ".class [c=y]{}", ".class [c=y]{}"},                                                       // tdewolff/minify#16
+		{false, "table{font-family:Verdana}", "table{font-family:Verdana;}"},                              // tdewolff/minify#22
+
+		// go-fuzz
+		{false, "@-webkit-", "@-webkit-;"},
+	}
+	for _, tt := range parseTests {
+		t.Run(tt.css, func(t *testing.T) {
+			output := ""
+			p := NewParser(bytes.NewBufferString(tt.css), tt.inline)
+			for {
+				grammar, _, data := p.Next()
+				data = parse.Copy(data)
+				if grammar == ErrorGrammar {
+					if err := p.Err(); err != io.EOF {
+						for _, val := range p.Values() {
+							data = append(data, val.Data...)
+						}
+						if perr, ok := err.(*parse.Error); ok && perr.Message == "unexpected token in declaration" {
+							data = append(data, ";"...)
+						}
+					} else {
+						test.T(t, err, io.EOF)
+						break
+					}
+				} else if grammar == AtRuleGrammar || grammar == BeginAtRuleGrammar || grammar == QualifiedRuleGrammar || grammar == BeginRulesetGrammar || grammar == DeclarationGrammar || grammar == CustomPropertyGrammar {
+					if grammar == DeclarationGrammar || grammar == CustomPropertyGrammar {
+						data = append(data, ":"...)
+					}
+					for _, val := range p.Values() {
+						data = append(data, val.Data...)
+					}
+					if grammar == BeginAtRuleGrammar || grammar == BeginRulesetGrammar {
+						data = append(data, "{"...)
+					} else if grammar == AtRuleGrammar || grammar == DeclarationGrammar || grammar == CustomPropertyGrammar {
+						data = append(data, ";"...)
+					} else if grammar == QualifiedRuleGrammar {
+						data = append(data, ","...)
+					}
+				}
+				output += string(data)
+			}
+			test.String(t, output, tt.expected)
+		})
+	}
+
+	test.T(t, ErrorGrammar.String(), "Error")
+	test.T(t, AtRuleGrammar.String(), "AtRule")
+	test.T(t, BeginAtRuleGrammar.String(), "BeginAtRule")
+	test.T(t, EndAtRuleGrammar.String(), "EndAtRule")
+	test.T(t, BeginRulesetGrammar.String(), "BeginRuleset")
+	test.T(t, EndRulesetGrammar.String(), "EndRuleset")
+	test.T(t, DeclarationGrammar.String(), "Declaration")
+	test.T(t, TokenGrammar.String(), "Token")
+	test.T(t, CommentGrammar.String(), "Comment")
+	test.T(t, CustomPropertyGrammar.String(), "CustomProperty")
+	test.T(t, GrammarType(100).String(), "Invalid(100)")
+}
+
+func TestParseError(t *testing.T) {
+	var parseErrorTests = []struct {
+		inline bool
+		css    string
+		col    int
+	}{
+		{false, "selector", 9},
+		{true, "color 0", 8},
+		{true, "--color 0", 10},
+		{true, "--custom-variable:0", 0},
+	}
+	for _, tt := range parseErrorTests {
+		t.Run(tt.css, func(t *testing.T) {
+			p := NewParser(bytes.NewBufferString(tt.css), tt.inline)
+			for {
+				grammar, _, _ := p.Next()
+				if grammar == ErrorGrammar {
+					if tt.col == 0 {
+						test.T(t, p.Err(), io.EOF)
+					} else if perr, ok := p.Err().(*parse.Error); ok {
+						test.T(t, perr.Col, tt.col)
+					} else {
+						test.Fail(t, "bad error:", p.Err())
+					}
+					break
+				}
+			}
+		})
+	}
+}
+
+func TestReader(t *testing.T) {
+	input := "x:a;"
+	p := NewParser(test.NewPlainReader(bytes.NewBufferString(input)), true)
+	for {
+		grammar, _, _ := p.Next()
+		if grammar == ErrorGrammar {
+			break
+		}
+	}
+}
+
+////////////////////////////////////////////////////////////////
+
+type Obj struct{}
+
+func (*Obj) F() {}
+
+var f1 func(*Obj)
+
+func BenchmarkFuncPtr(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		f1 = (*Obj).F
+	}
+}
+
+var f2 func()
+
+func BenchmarkMemFuncPtr(b *testing.B) {
+	obj := &Obj{}
+	for i := 0; i < b.N; i++ {
+		f2 = obj.F
+	}
+}
+
+func ExampleNewParser() {
+	p := NewParser(bytes.NewBufferString("color: red;"), true) // false because this is the content of an inline style attribute
+	out := ""
+	for {
+		gt, _, data := p.Next()
+		if gt == ErrorGrammar {
+			break
+		} else if gt == AtRuleGrammar || gt == BeginAtRuleGrammar || gt == BeginRulesetGrammar || gt == DeclarationGrammar {
+			out += string(data)
+			if gt == DeclarationGrammar {
+				out += ":"
+			}
+			for _, val := range p.Values() {
+				out += string(val.Data)
+			}
+			if gt == BeginAtRuleGrammar || gt == BeginRulesetGrammar {
+				out += "{"
+			} else if gt == AtRuleGrammar || gt == DeclarationGrammar {
+				out += ";"
+			}
+		} else {
+			out += string(data)
+		}
+	}
+	fmt.Println(out)
+	// Output: color:red;
+}
diff --git a/vendor/github.com/tdewolff/parse/css/util.go b/vendor/github.com/tdewolff/parse/css/util.go
new file mode 100644
index 0000000..676dee8
--- /dev/null
+++ b/vendor/github.com/tdewolff/parse/css/util.go
@@ -0,0 +1,47 @@
+package css // import "github.com/tdewolff/parse/css"
+
+import "github.com/tdewolff/parse/buffer"
+
+// IsIdent returns true if the bytes are a valid identifier.
+func IsIdent(b []byte) bool {
+	l := NewLexer(buffer.NewReader(b))
+	l.consumeIdentToken()
+	l.r.Restore()
+	return l.r.Pos() == len(b)
+}
+
+// IsURLUnquoted returns true if the bytes are a valid unquoted URL.
+func IsURLUnquoted(b []byte) bool {
+	l := NewLexer(buffer.NewReader(b))
+	l.consumeUnquotedURL()
+	l.r.Restore()
+	return l.r.Pos() == len(b)
+}
+
+// HSL2RGB converts HSL to RGB with all of range [0,1]
+// from http://www.w3.org/TR/css3-color/#hsl-color
+func HSL2RGB(h, s, l float64) (float64, float64, float64) {
+	m2 := l * (s + 1)
+	if l > 0.5 {
+		m2 = l + s - l*s
+	}
+	m1 := l*2 - m2
+	return hue2rgb(m1, m2, h+1.0/3.0), hue2rgb(m1, m2, h), hue2rgb(m1, m2, h-1.0/3.0)
+}
+
+func hue2rgb(m1, m2, h float64) float64 {
+	if h < 0.0 {
+		h += 1.0
+	}
+	if h > 1.0 {
+		h -= 1.0
+	}
+	if h*6.0 < 1.0 {
+		return m1 + (m2-m1)*h*6.0
+	} else if h*2.0 < 1.0 {
+		return m2
+	} else if h*3.0 < 2.0 {
+		return m1 + (m2-m1)*(2.0/3.0-h)*6.0
+	}
+	return m1
+}
diff --git a/vendor/github.com/tdewolff/parse/css/util_test.go b/vendor/github.com/tdewolff/parse/css/util_test.go
new file mode 100644
index 0000000..9eb5aa9
--- /dev/null
+++ b/vendor/github.com/tdewolff/parse/css/util_test.go
@@ -0,0 +1,34 @@
+package css // import "github.com/tdewolff/parse/css"
+
+import (
+	"testing"
+
+	"github.com/tdewolff/test"
+)
+
+func TestIsIdent(t *testing.T) {
+	test.That(t, IsIdent([]byte("color")))
+	test.That(t, !IsIdent([]byte("4.5")))
+}
+
+func TestIsURLUnquoted(t *testing.T) {
+	test.That(t, IsURLUnquoted([]byte("http://x")))
+	test.That(t, !IsURLUnquoted([]byte(")")))
+}
+
+func TestHsl2Rgb(t *testing.T) {
+	r, g, b := HSL2RGB(0.0, 1.0, 0.5)
+	test.T(t, r, 1.0)
+	test.T(t, g, 0.0)
+	test.T(t, b, 0.0)
+
+	r, g, b = HSL2RGB(1.0, 1.0, 0.5)
+	test.T(t, r, 1.0)
+	test.T(t, g, 0.0)
+	test.T(t, b, 0.0)
+
+	r, g, b = HSL2RGB(0.66, 0.0, 1.0)
+	test.T(t, r, 1.0)
+	test.T(t, g, 1.0)
+	test.T(t, b, 1.0)
+}