Added vendor lock on depsHEADmaster

1 files changed, 1549 insertions, 0 deletions

diff --git a/vendor/github.com/tdewolff/minify/v2/css/css.go b/vendor/github.com/tdewolff/minify/v2/css/css.go
new file mode 100644
index 0000000..4929609
--- /dev/null
+++ b/vendor/github.com/tdewolff/minify/v2/css/css.go
@@ -0,0 +1,1549 @@
+// Package css minifies CSS3 following the specifications at http://www.w3.org/TR/css-syntax-3/.
+package css
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"math"
+	"sort"
+	"strconv"
+	"strings"
+
+	"github.com/tdewolff/minify/v2"
+	"github.com/tdewolff/parse/v2"
+	"github.com/tdewolff/parse/v2/css"
+	strconvParse "github.com/tdewolff/parse/v2/strconv"
+)
+
+var (
+	spaceBytes        = []byte(" ")
+	colonBytes        = []byte(":")
+	semicolonBytes    = []byte(";")
+	commaBytes        = []byte(",")
+	leftBracketBytes  = []byte("{")
+	rightBracketBytes = []byte("}")
+	rightParenBytes   = []byte(")")
+	urlBytes          = []byte("url(")
+	zeroBytes         = []byte("0")
+	oneBytes          = []byte("1")
+	transparentBytes  = []byte("transparent")
+	blackBytes        = []byte("#0000")
+	initialBytes      = []byte("initial")
+	noneBytes         = []byte("none")
+	autoBytes         = []byte("auto")
+	leftBytes         = []byte("left")
+	topBytes          = []byte("top")
+	n400Bytes         = []byte("400")
+	n700Bytes         = []byte("700")
+	n50pBytes         = []byte("50%")
+	n100pBytes        = []byte("100%")
+	repeatXBytes      = []byte("repeat-x")
+	repeatYBytes      = []byte("repeat-y")
+	importantBytes    = []byte("!important")
+	dataSchemeBytes   = []byte("data:")
+)
+
+type cssMinifier struct {
+	m *minify.M
+	w io.Writer
+	p *css.Parser
+	o *Minifier
+
+	tokenBuffer []Token
+	tokensLevel int
+}
+
+////////////////////////////////////////////////////////////////
+
+// Minifier is a CSS minifier.
+type Minifier struct {
+	KeepCSS2     bool
+	Precision    int // number of significant digits
+	newPrecision int // precision for new numbers
+}
+
+// Minify minifies CSS data, it reads from r and writes to w.
+func Minify(m *minify.M, w io.Writer, r io.Reader, params map[string]string) error {
+	return (&Minifier{}).Minify(m, w, r, params)
+}
+
+// Token is a parsed token with extra information for functions.
+type Token struct {
+	css.TokenType
+	Data       []byte
+	Args       []Token // only filled for functions
+	Fun, Ident Hash    // only filled for functions and identifiers respectively
+}
+
+func (t Token) String() string {
+	if len(t.Args) == 0 {
+		return t.TokenType.String() + "(" + string(t.Data) + ")"
+	}
+	return fmt.Sprint(t.Args)
+}
+
+// Equal returns true if both tokens are equal.
+func (t Token) Equal(t2 Token) bool {
+	if t.TokenType == t2.TokenType && bytes.Equal(t.Data, t2.Data) && len(t.Args) == len(t2.Args) {
+		for i := 0; i < len(t.Args); i++ {
+			if t.Args[i].TokenType != t2.Args[i].TokenType || !bytes.Equal(t.Args[i].Data, t2.Args[i].Data) {
+				return false
+			}
+		}
+		return true
+	}
+	return false
+}
+
+// IsZero return true if a dimension, percentage, or number token is zero.
+func (t Token) IsZero() bool {
+	// as each number is already minified, starting with a zero means it is zero
+	return (t.TokenType == css.DimensionToken || t.TokenType == css.PercentageToken || t.TokenType == css.NumberToken) && t.Data[0] == '0'
+}
+
+// IsLength returns true if the token is a length.
+func (t Token) IsLength() bool {
+	if t.TokenType == css.DimensionToken {
+		return true
+	} else if t.TokenType == css.NumberToken && t.Data[0] == '0' {
+		return true
+	} else if t.TokenType == css.FunctionToken {
+		fun := ToHash(t.Data[:len(t.Data)-1])
+		if fun == Calc || fun == Min || fun == Max || fun == Clamp || fun == Attr || fun == Var || fun == Env {
+			return true
+		}
+	}
+	return false
+}
+
+// IsLengthPercentage returns true if the token is a length or percentage token.
+func (t Token) IsLengthPercentage() bool {
+	return t.TokenType == css.PercentageToken || t.IsLength()
+}
+
+////////////////////////////////////////////////////////////////
+
+// Minify minifies CSS data, it reads from r and writes to w.
+func (o *Minifier) Minify(m *minify.M, w io.Writer, r io.Reader, params map[string]string) error {
+	o.newPrecision = o.Precision
+	if o.newPrecision <= 0 || 15 < o.newPrecision {
+		o.newPrecision = 15 // minimum number of digits a double can represent exactly
+	}
+
+	z := parse.NewInput(r)
+	defer z.Restore()
+
+	isInline := params != nil && params["inline"] == "1"
+	c := &cssMinifier{
+		m: m,
+		w: w,
+		p: css.NewParser(z, isInline),
+		o: o,
+	}
+	c.minifyGrammar()
+
+	if _, err := w.Write(nil); err != nil {
+		return err
+	}
+	if c.p.Err() == io.EOF {
+		return nil
+	}
+	return c.p.Err()
+}
+
+func (c *cssMinifier) minifyGrammar() {
+	semicolonQueued := false
+	for {
+		gt, _, data := c.p.Next()
+		switch gt {
+		case css.ErrorGrammar:
+			if c.p.HasParseError() {
+				if semicolonQueued {
+					c.w.Write(semicolonBytes)
+				}
+
+				// write out the offending declaration (but save the semicolon)
+				vals := c.p.Values()
+				if len(vals) > 0 && vals[len(vals)-1].TokenType == css.SemicolonToken {
+					vals = vals[:len(vals)-1]
+					semicolonQueued = true
+				}
+				for _, val := range vals {
+					c.w.Write(val.Data)
+				}
+				continue
+			}
+			return
+		case css.EndAtRuleGrammar, css.EndRulesetGrammar:
+			c.w.Write(rightBracketBytes)
+			semicolonQueued = false
+			continue
+		}
+
+		if semicolonQueued {
+			c.w.Write(semicolonBytes)
+			semicolonQueued = false
+		}
+
+		switch gt {
+		case css.AtRuleGrammar:
+			c.w.Write(data)
+			values := c.p.Values()
+			if ToHash(data[1:]) == Import && len(values) == 2 && values[1].TokenType == css.URLToken && 4 < len(values[1].Data) && values[1].Data[len(values[1].Data)-1] == ')' {
+				url := values[1].Data
+				if url[4] != '"' && url[4] != '\'' {
+					a := 4
+					for parse.IsWhitespace(url[a]) || parse.IsNewline(url[a]) {
+						a++
+					}
+					b := len(url) - 2
+					for a < b && (parse.IsWhitespace(url[b]) || parse.IsNewline(url[b])) {
+						b--
+					}
+					if a == b {
+						url = url[:2]
+					} else {
+						url = url[a-1 : b+2]
+					}
+					url[0] = '"'
+					url[len(url)-1] = '"'
+				} else {
+					url = url[4 : len(url)-1]
+				}
+				values[1].Data = url
+			}
+			for _, val := range values {
+				c.w.Write(val.Data)
+			}
+			semicolonQueued = true
+		case css.BeginAtRuleGrammar:
+			c.w.Write(data)
+			for _, val := range c.p.Values() {
+				c.w.Write(val.Data)
+			}
+			c.w.Write(leftBracketBytes)
+		case css.QualifiedRuleGrammar:
+			c.minifySelectors(data, c.p.Values())
+			c.w.Write(commaBytes)
+		case css.BeginRulesetGrammar:
+			c.minifySelectors(data, c.p.Values())
+			c.w.Write(leftBracketBytes)
+		case css.DeclarationGrammar:
+			c.minifyDeclaration(data, c.p.Values())
+			semicolonQueued = true
+		case css.CustomPropertyGrammar:
+			c.w.Write(data)
+			c.w.Write(colonBytes)
+			value := parse.TrimWhitespace(c.p.Values()[0].Data)
+			if len(c.p.Values()[0].Data) != 0 && len(value) == 0 {
+				value = spaceBytes
+			}
+			c.w.Write(value)
+			semicolonQueued = true
+		case css.CommentGrammar:
+			if len(data) > 5 && data[1] == '*' && data[2] == '!' {
+				c.w.Write(data[:3])
+				comment := parse.TrimWhitespace(parse.ReplaceMultipleWhitespace(data[3 : len(data)-2]))
+				c.w.Write(comment)
+				c.w.Write(data[len(data)-2:])
+			}
+		default:
+			c.w.Write(data)
+		}
+	}
+}
+
+func (c *cssMinifier) minifySelectors(property []byte, values []css.Token) {
+	inAttr := false
+	isClass := false
+	for _, val := range c.p.Values() {
+		if !inAttr {
+			if val.TokenType == css.IdentToken {
+				if !isClass {
+					parse.ToLower(val.Data)
+				}
+				isClass = false
+			} else if val.TokenType == css.DelimToken && val.Data[0] == '.' {
+				isClass = true
+			} else if val.TokenType == css.LeftBracketToken {
+				inAttr = true
+			}
+		} else {
+			if val.TokenType == css.StringToken && len(val.Data) > 2 {
+				s := val.Data[1 : len(val.Data)-1]
+				if css.IsIdent(s) {
+					c.w.Write(s)
+					continue
+				}
+			} else if val.TokenType == css.RightBracketToken {
+				inAttr = false
+			} else if val.TokenType == css.IdentToken && len(val.Data) == 1 && (val.Data[0] == 'i' || val.Data[0] == 'I') {
+				c.w.Write(spaceBytes)
+			}
+		}
+		c.w.Write(val.Data)
+	}
+}
+
+func (c *cssMinifier) parseFunction(values []css.Token) ([]Token, int) {
+	i := 1
+	level := 0
+	args := []Token{}
+	for ; i < len(values); i++ {
+		tt := values[i].TokenType
+		data := values[i].Data
+		if tt == css.LeftParenthesisToken {
+			level++
+		} else if tt == css.RightParenthesisToken {
+			if level == 0 {
+				i++
+				break
+			}
+			level--
+		}
+		if tt == css.FunctionToken {
+			subArgs, di := c.parseFunction(values[i:])
+			h := ToHash(parse.ToLower(parse.Copy(data[:len(data)-1]))) // TODO: use ToHashFold
+			args = append(args, Token{tt, data, subArgs, h, 0})
+			i += di - 1
+		} else {
+			var h Hash
+			if tt == css.IdentToken {
+				h = ToHash(parse.ToLower(parse.Copy(data))) // TODO: use ToHashFold
+			}
+			args = append(args, Token{tt, data, nil, 0, h})
+		}
+	}
+	return args, i
+}
+
+func (c *cssMinifier) parseDeclaration(values []css.Token) []Token {
+	// Check if this is a simple list of values separated by whitespace or commas, otherwise we'll not be processing
+	prevSep := true
+	tokens := c.tokenBuffer[:0]
+	for i := 0; i < len(values); i++ {
+		tt := values[i].TokenType
+		data := values[i].Data
+		if tt == css.LeftParenthesisToken || tt == css.LeftBraceToken || tt == css.LeftBracketToken ||
+			tt == css.RightParenthesisToken || tt == css.RightBraceToken || tt == css.RightBracketToken {
+			return nil
+		}
+
+		if !prevSep && tt != css.WhitespaceToken && tt != css.CommaToken && (tt != css.DelimToken || values[i].Data[0] != '/') {
+			return nil
+		}
+
+		if tt == css.WhitespaceToken || tt == css.CommaToken || tt == css.DelimToken && values[i].Data[0] == '/' {
+			if tt != css.WhitespaceToken {
+				tokens = append(tokens, Token{tt, data, nil, 0, 0})
+			}
+			prevSep = true
+		} else if tt == css.FunctionToken {
+			args, di := c.parseFunction(values[i:])
+			h := ToHash(parse.ToLower(parse.Copy(data[:len(data)-1]))) // TODO: use ToHashFold
+			tokens = append(tokens, Token{tt, data, args, h, 0})
+			prevSep = true
+			i += di - 1
+		} else {
+			var h Hash
+			if tt == css.IdentToken {
+				h = ToHash(parse.ToLower(parse.Copy(data))) // TODO: use ToHashFold
+			}
+			tokens = append(tokens, Token{tt, data, nil, 0, h})
+			prevSep = tt == css.URLToken
+		}
+	}
+	c.tokenBuffer = tokens // update buffer size for memory reuse
+	return tokens
+}
+
+func (c *cssMinifier) minifyDeclaration(property []byte, components []css.Token) {
+	c.w.Write(property)
+	c.w.Write(colonBytes)
+
+	if len(components) == 0 {
+		return
+	}
+
+	// Strip !important from the component list, this will be added later separately
+	important := false
+	if len(components) > 2 && components[len(components)-2].TokenType == css.DelimToken && components[len(components)-2].Data[0] == '!' && ToHash(components[len(components)-1].Data) == Important {
+		components = components[:len(components)-2]
+		important = true
+	}
+
+	prop := ToHash(property)
+	values := c.parseDeclaration(components)
+
+	// Do not process complex values (eg. containing blocks or is not alternated between whitespace/commas and flat values
+	if values == nil {
+		if prop == Filter && len(components) == 11 {
+			if bytes.Equal(components[0].Data, []byte("progid")) &&
+				components[1].TokenType == css.ColonToken &&
+				bytes.Equal(components[2].Data, []byte("DXImageTransform")) &&
+				components[3].Data[0] == '.' &&
+				bytes.Equal(components[4].Data, []byte("Microsoft")) &&
+				components[5].Data[0] == '.' &&
+				bytes.Equal(components[6].Data, []byte("Alpha(")) &&
+				bytes.Equal(parse.ToLower(components[7].Data), []byte("opacity")) &&
+				components[8].Data[0] == '=' &&
+				components[10].Data[0] == ')' {
+				components = components[6:]
+				components[0].Data = []byte("alpha(")
+			}
+		}
+
+		for _, component := range components {
+			c.w.Write(component.Data)
+		}
+		if important {
+			c.w.Write(importantBytes)
+		}
+		return
+	}
+
+	values = c.minifyTokens(prop, 0, values)
+	if len(values) > 0 {
+		values = c.minifyProperty(prop, values)
+	}
+	c.writeDeclaration(values, important)
+}
+
+func (c *cssMinifier) writeFunction(args []Token) {
+	for _, arg := range args {
+		c.w.Write(arg.Data)
+		if arg.TokenType == css.FunctionToken {
+			c.writeFunction(arg.Args)
+			c.w.Write(rightParenBytes)
+		}
+	}
+}
+
+func (c *cssMinifier) writeDeclaration(values []Token, important bool) {
+	prevSep := true
+	for _, value := range values {
+		if !prevSep && value.TokenType != css.CommaToken && (value.TokenType != css.DelimToken || value.Data[0] != '/') {
+			c.w.Write(spaceBytes)
+		}
+
+		c.w.Write(value.Data)
+		if value.TokenType == css.FunctionToken {
+			c.writeFunction(value.Args)
+			c.w.Write(rightParenBytes)
+		}
+
+		if value.TokenType == css.CommaToken || value.TokenType == css.DelimToken && value.Data[0] == '/' || value.TokenType == css.FunctionToken || value.TokenType == css.URLToken {
+			prevSep = true
+		} else {
+			prevSep = false
+		}
+	}
+
+	if important {
+		c.w.Write(importantBytes)
+	}
+}
+
+func (c *cssMinifier) minifyTokens(prop Hash, fun Hash, values []Token) []Token {
+	if 100 < c.tokensLevel+1 {
+		return values
+	}
+	c.tokensLevel++
+
+	for i, value := range values {
+		tt := value.TokenType
+		switch tt {
+		case css.NumberToken:
+			if prop == Z_Index || prop == Counter_Increment || prop == Counter_Reset || prop == Orphans || prop == Widows {
+				break // integers
+			}
+			if c.o.KeepCSS2 {
+				values[i].Data = minify.Decimal(values[i].Data, c.o.Precision) // don't use exponents
+			} else {
+				values[i].Data = minify.Number(values[i].Data, c.o.Precision)
+			}
+		case css.PercentageToken:
+			n := len(values[i].Data) - 1
+			if c.o.KeepCSS2 {
+				values[i].Data = minify.Decimal(values[i].Data[:n], c.o.Precision) // don't use exponents
+			} else {
+				values[i].Data = minify.Number(values[i].Data[:n], c.o.Precision)
+			}
+			values[i].Data = append(values[i].Data, '%')
+		case css.DimensionToken:
+			var dim []byte
+			values[i], dim = c.minifyDimension(values[i])
+			if 1 < len(values[i].Data) && values[i].Data[0] == '0' && optionalZeroDimension[string(dim)] && prop != Flex && fun == 0 {
+				// cut dimension for zero value, TODO: don't hardcode check for Flex and remove the dimension in minifyDimension
+				values[i].Data = values[i].Data[:1]
+			}
+		case css.StringToken:
+			values[i].Data = removeMarkupNewlines(values[i].Data)
+		case css.URLToken:
+			if 10 < len(values[i].Data) {
+				uri := parse.TrimWhitespace(values[i].Data[4 : len(values[i].Data)-1])
+				delim := byte('"')
+				if 1 < len(uri) && (uri[0] == '\'' || uri[0] == '"') {
+					delim = uri[0]
+					uri = removeMarkupNewlines(uri)
+					uri = uri[1 : len(uri)-1]
+				}
+				if 4 < len(uri) && parse.EqualFold(uri[:5], dataSchemeBytes) {
+					uri = minify.DataURI(c.m, uri)
+				}
+				if css.IsURLUnquoted(uri) {
+					values[i].Data = append(append(urlBytes, uri...), ')')
+				} else {
+					values[i].Data = append(append(append(urlBytes, delim), uri...), delim, ')')
+				}
+			}
+		case css.FunctionToken:
+			values[i].Args = c.minifyTokens(prop, values[i].Fun, values[i].Args)
+
+			fun := values[i].Fun
+			args := values[i].Args
+			if fun == Rgb || fun == Rgba || fun == Hsl || fun == Hsla {
+				valid := true
+				vals := []float64{}
+				for i, arg := range args {
+					numeric := arg.TokenType == css.NumberToken || arg.TokenType == css.PercentageToken
+					separator := arg.TokenType == css.CommaToken || i != 5 && arg.TokenType == css.WhitespaceToken || i == 5 && arg.TokenType == css.DelimToken && arg.Data[0] == '/'
+					if i%2 == 0 && !numeric || i%2 == 1 && !separator {
+						valid = false
+						break
+					} else if numeric {
+						var d float64
+						if arg.TokenType == css.PercentageToken {
+							var err error
+							d, err = strconv.ParseFloat(string(arg.Data[:len(arg.Data)-1]), 32) // can overflow
+							if err != nil {
+								valid = false
+								break
+							}
+							d /= 100.0
+							if d < minify.Epsilon {
+								d = 0.0
+							} else if 1.0-minify.Epsilon < d {
+								d = 1.0
+							}
+						} else {
+							var err error
+							d, err = strconv.ParseFloat(string(arg.Data), 32) // can overflow
+							if err != nil {
+								valid = false
+								break
+							}
+						}
+						vals = append(vals, d)
+					}
+				}
+				if !valid {
+					break
+				}
+
+				a := 1.0
+				if len(vals) == 4 {
+					if vals[0] < minify.Epsilon && vals[1] < minify.Epsilon && vals[2] < minify.Epsilon && vals[3] < minify.Epsilon {
+						values[i] = Token{css.IdentToken, transparentBytes, nil, 0, Transparent}
+						break
+					} else if 1.0-minify.Epsilon < vals[3] {
+						vals = vals[:3]
+						values[i].Args = values[i].Args[:len(values[i].Args)-2]
+						if fun == Rgba || fun == Hsla {
+							values[i].Data = values[i].Data[:len(values[i].Data)-1]
+							values[i].Data[len(values[i].Data)-1] = '('
+						}
+					} else {
+						a = vals[3]
+					}
+				}
+
+				if a == 1.0 && (len(vals) == 3 || len(vals) == 4) { // only minify color if fully opaque
+					if fun == Rgb || fun == Rgba {
+						for j := 0; j < 3; j++ {
+							if args[j*2].TokenType == css.NumberToken {
+								vals[j] /= 255.0
+								if vals[j] < minify.Epsilon {
+									vals[j] = 0.0
+								} else if 1.0-minify.Epsilon < vals[j] {
+									vals[j] = 1.0
+								}
+							}
+						}
+						values[i] = rgbToToken(vals[0], vals[1], vals[2])
+						break
+					} else if fun == Hsl || fun == Hsla && args[0].TokenType == css.NumberToken && args[2].TokenType == css.PercentageToken && args[4].TokenType == css.PercentageToken {
+						vals[0] /= 360.0
+						_, vals[0] = math.Modf(vals[0])
+						if vals[0] < 0.0 {
+							vals[0] = 1.0 + vals[0]
+						}
+						r, g, b := css.HSL2RGB(vals[0], vals[1], vals[2])
+						values[i] = rgbToToken(r, g, b)
+						break
+					}
+				} else if len(vals) == 4 {
+					args[6] = minifyNumberPercentage(args[6])
+				}
+
+				if 3 <= len(vals) && (fun == Rgb || fun == Rgba) {
+					// 0%, 20%, 40%, 60%, 80% and 100% can be represented exactly as, 51, 102, 153, 204, and 255 respectively
+					removePercentage := true
+					for j := 0; j < 3; j++ {
+						if args[j*2].TokenType != css.PercentageToken || 2.0*minify.Epsilon <= math.Mod(vals[j]+minify.Epsilon, 0.2) {
+							removePercentage = false
+							break
+						}
+					}
+					if removePercentage {
+						for j := 0; j < 3; j++ {
+							args[j*2].TokenType = css.NumberToken
+							if vals[j] < minify.Epsilon {
+								args[j*2].Data = zeroBytes
+							} else if math.Abs(vals[j]-0.2) < minify.Epsilon {
+								args[j*2].Data = []byte("51")
+							} else if math.Abs(vals[j]-0.4) < minify.Epsilon {
+								args[j*2].Data = []byte("102")
+							} else if math.Abs(vals[j]-0.6) < minify.Epsilon {
+								args[j*2].Data = []byte("153")
+							} else if math.Abs(vals[j]-0.8) < minify.Epsilon {
+								args[j*2].Data = []byte("204")
+							} else if math.Abs(vals[j]-1.0) < minify.Epsilon {
+								args[j*2].Data = []byte("255")
+							}
+						}
+					}
+				}
+			}
+		}
+	}
+	c.tokensLevel--
+	return values
+}
+
+func (c *cssMinifier) minifyProperty(prop Hash, values []Token) []Token {
+	// limit maximum to prevent slow recursions (e.g. for background's append)
+	if 100 < len(values) {
+		return values
+	}
+
+	switch prop {
+	case Font:
+		if len(values) > 1 { // must contain atleast font-size and font-family
+			// the font-families are separated by commas and are at the end of font
+			// get index for last token before font family names
+			i := len(values) - 1
+			for j, value := range values[2:] {
+				if value.TokenType == css.CommaToken {
+					i = 2 + j - 1 // identifier before first comma is a font-family
+					break
+				}
+			}
+			i--
+
+			// advance i while still at font-families when they contain spaces but no quotes
+			for ; i > 0; i-- { // i cannot be 0, font-family must be prepended by font-size
+				if values[i-1].TokenType == css.DelimToken && values[i-1].Data[0] == '/' {
+					break
+				} else if values[i].TokenType != css.IdentToken && values[i].TokenType != css.StringToken {
+					break
+				} else if h := values[i].Ident; h == Xx_Small || h == X_Small || h == Small || h == Medium || h == Large || h == X_Large || h == Xx_Large || h == Smaller || h == Larger || h == Inherit || h == Initial || h == Unset {
+					// inherit, initial and unset are followed by an IdentToken/StringToken, so must be for font-size
+					break
+				}
+			}
+
+			// font-family minified in place
+			values = append(values[:i+1], c.minifyProperty(Font_Family, values[i+1:])...)
+
+			// fix for IE9, IE10, IE11: font name starting with `-` is not recognized
+			if values[i+1].Data[0] == '-' {
+				v := make([]byte, len(values[i+1].Data)+2)
+				v[0] = '\''
+				copy(v[1:], values[i+1].Data)
+				v[len(v)-1] = '\''
+				values[i+1].Data = v
+			}
+
+			if i > 0 {
+				// line-height
+				if i > 1 && values[i-1].TokenType == css.DelimToken && values[i-1].Data[0] == '/' {
+					if values[i].Ident == Normal {
+						values = append(values[:i-1], values[i+1:]...)
+					}
+					i -= 2
+				}
+
+				// font-size
+				i--
+
+				for ; i > -1; i-- {
+					if values[i].Ident == Normal {
+						values = append(values[:i], values[i+1:]...)
+					} else if values[i].Ident == Bold {
+						values[i].TokenType = css.NumberToken
+						values[i].Data = n700Bytes
+					} else if values[i].TokenType == css.NumberToken && bytes.Equal(values[i].Data, n400Bytes) {
+						values = append(values[:i], values[i+1:]...)
+					}
+				}
+			}
+		}
+	case Font_Family:
+		for i, value := range values {
+			if value.TokenType == css.StringToken && 2 < len(value.Data) {
+				unquote := true
+				parse.ToLower(value.Data)
+				s := value.Data[1 : len(value.Data)-1]
+				if 0 < len(s) {
+					for _, split := range bytes.Split(s, spaceBytes) {
+						// if len is zero, it contains two consecutive spaces
+						if len(split) == 0 || !css.IsIdent(split) {
+							unquote = false
+							break
+						}
+					}
+				}
+				if unquote {
+					values[i].Data = s
+				}
+			}
+		}
+	case Font_Weight:
+		if values[0].Ident == Normal {
+			values[0].TokenType = css.NumberToken
+			values[0].Data = n400Bytes
+		} else if values[0].Ident == Bold {
+			values[0].TokenType = css.NumberToken
+			values[0].Data = n700Bytes
+		}
+	case Url:
+		for i := 0; i < len(values); i++ {
+			if values[i].TokenType == css.FunctionToken && len(values[i].Args) == 1 {
+				fun := values[i].Fun
+				data := values[i].Args[0].Data
+				if fun == Local && (data[0] == '\'' || data[0] == '"') {
+					if css.IsURLUnquoted(data[1 : len(data)-1]) {
+						data = data[1 : len(data)-1]
+					}
+					values[i].Args[0].Data = data
+				}
+			}
+		}
+	case Margin, Padding, Border_Width:
+		switch len(values) {
+		case 2:
+			if values[0].Equal(values[1]) {
+				values = values[:1]
+			}
+		case 3:
+			if values[0].Equal(values[1]) && values[0].Equal(values[2]) {
+				values = values[:1]
+			} else if values[0].Equal(values[2]) {
+				values = values[:2]
+			}
+		case 4:
+			if values[0].Equal(values[1]) && values[0].Equal(values[2]) && values[0].Equal(values[3]) {
+				values = values[:1]
+			} else if values[0].Equal(values[2]) && values[1].Equal(values[3]) {
+				values = values[:2]
+			} else if values[1].Equal(values[3]) {
+				values = values[:3]
+			}
+		}
+	case Border, Border_Bottom, Border_Left, Border_Right, Border_Top:
+		for i := 0; i < len(values); i++ {
+			if values[i].Ident == None || values[i].Ident == Currentcolor || values[i].Ident == Medium {
+				values = append(values[:i], values[i+1:]...)
+				i--
+			} else {
+				values[i] = minifyColor(values[i])
+			}
+		}
+		if len(values) == 0 {
+			values = []Token{{css.IdentToken, noneBytes, nil, 0, None}}
+		}
+	case Outline:
+		for i := 0; i < len(values); i++ {
+			if values[i].Ident == Invert || values[i].Ident == None || values[i].Ident == Medium {
+				values = append(values[:i], values[i+1:]...)
+				i--
+			} else {
+				values[i] = minifyColor(values[i])
+			}
+		}
+		if len(values) == 0 {
+			values = []Token{{css.IdentToken, noneBytes, nil, 0, None}}
+		}
+	case Background:
+		start := 0
+		for end := 0; end <= len(values); end++ { // loop over comma-separated lists
+			if end != len(values) && values[end].TokenType != css.CommaToken {
+				continue
+			} else if start == end {
+				start++
+				continue
+			}
+
+			// minify background-size and lowercase all identifiers
+			for i := start; i < end; i++ {
+				if values[i].TokenType == css.DelimToken && values[i].Data[0] == '/' {
+					// background-size consists of either [<length-percentage> | auto | cover | contain] or [<length-percentage> | auto]{2}
+					// we can only minify the latter
+					if i+1 < end && (values[i+1].TokenType == css.NumberToken || values[i+1].IsLengthPercentage() || values[i+1].Ident == Auto) {
+						if i+2 < end && (values[i+2].TokenType == css.NumberToken || values[i+2].IsLengthPercentage() || values[i+2].Ident == Auto) {
+							sizeValues := c.minifyProperty(Background_Size, values[i+1:i+3])
+							if len(sizeValues) == 1 && sizeValues[0].Ident == Auto {
+								// remove background-size if it is '/ auto' after minifying the property
+								values = append(values[:i], values[i+3:]...)
+								end -= 3
+								i--
+							} else {
+								values = append(values[:i+1], append(sizeValues, values[i+3:]...)...)
+								end -= 2 - len(sizeValues)
+								i += len(sizeValues) - 1
+							}
+						} else if values[i+1].Ident == Auto {
+							// remove background-size if it is '/ auto'
+							values = append(values[:i], values[i+2:]...)
+							end -= 2
+							i--
+						}
+					}
+				}
+			}
+
+			// minify all other values
+			iPaddingBox := -1 // position of background-origin that is padding-box
+			for i := start; i < end; i++ {
+				h := values[i].Ident
+				values[i] = minifyColor(values[i])
+				if values[i].TokenType == css.IdentToken {
+					if i+1 < end && values[i+1].TokenType == css.IdentToken && (h == Space || h == Round || h == Repeat || h == No_Repeat) {
+						if h2 := values[i+1].Ident; h2 == Space || h2 == Round || h2 == Repeat || h2 == No_Repeat {
+							repeatValues := c.minifyProperty(Background_Repeat, values[i:i+2])
+							if len(repeatValues) == 1 && repeatValues[0].Ident == Repeat {
+								values = append(values[:i], values[i+2:]...)
+								end -= 2
+								i--
+							} else {
+								values = append(values[:i], append(repeatValues, values[i+2:]...)...)
+								end -= 2 - len(repeatValues)
+								i += len(repeatValues) - 1
+							}
+							continue
+						}
+					} else if h == None || h == Scroll || h == Transparent {
+						values = append(values[:i], values[i+1:]...)
+						end--
+						i--
+						continue
+					} else if h == Border_Box || h == Padding_Box {
+						if iPaddingBox == -1 && h == Padding_Box { // background-origin
+							iPaddingBox = i
+						} else if iPaddingBox != -1 && h == Border_Box { // background-clip
+							values = append(values[:i], values[i+1:]...)
+							values = append(values[:iPaddingBox], values[iPaddingBox+1:]...)
+							end -= 2
+							i -= 2
+						}
+						continue
+					}
+				} else if values[i].TokenType == css.HashToken && bytes.Equal(values[i].Data, blackBytes) {
+					values = append(values[:i], values[i+1:]...)
+					end--
+					i--
+					continue
+				}
+
+				// further minify background-position and background-size combination
+				if values[i].TokenType == css.NumberToken || values[i].IsLengthPercentage() || h == Left || h == Right || h == Top || h == Bottom || h == Center {
+					j := i + 1
+					for ; j < len(values); j++ {
+						if h := values[j].Ident; h == Left || h == Right || h == Top || h == Bottom || h == Center {
+							continue
+						} else if values[j].TokenType == css.NumberToken || values[j].IsLengthPercentage() {
+							continue
+						}
+						break
+					}
+
+					positionValues := c.minifyProperty(Background_Position, values[i:j])
+					hasSize := j < len(values) && values[j].TokenType == css.DelimToken && values[j].Data[0] == '/'
+					if !hasSize && len(positionValues) == 2 && positionValues[0].IsZero() && positionValues[1].IsZero() {
+						if end-start == 2 {
+							values[i] = Token{css.NumberToken, zeroBytes, nil, 0, 0}
+							values[i+1] = Token{css.NumberToken, zeroBytes, nil, 0, 0}
+							i++
+						} else {
+							values = append(values[:i], values[j:]...)
+							end -= j - i
+							i--
+						}
+					} else {
+						if len(positionValues) == j-i {
+							for k, positionValue := range positionValues {
+								values[i+k] = positionValue
+							}
+						} else {
+							values = append(values[:i], append(positionValues, values[j:]...)...)
+							end -= j - i - len(positionValues)
+						}
+						i += len(positionValues) - 1
+					}
+				}
+			}
+
+			if end-start == 0 {
+				values = append(values[:start], append([]Token{{css.NumberToken, zeroBytes, nil, 0, 0}, {css.NumberToken, zeroBytes, nil, 0, 0}}, values[end:]...)...)
+				end += 2
+			}
+			start = end + 1
+		}
+	case Background_Size:
+		start := 0
+		for end := 0; end <= len(values); end++ { // loop over comma-separated lists
+			if end != len(values) && values[end].TokenType != css.CommaToken {
+				continue
+			} else if start == end {
+				start++
+				continue
+			}
+
+			if end-start == 2 && values[start+1].Ident == Auto {
+				values = append(values[:start+1], values[start+2:]...)
+				end--
+			}
+			start = end + 1
+		}
+	case Background_Repeat:
+		start := 0
+		for end := 0; end <= len(values); end++ { // loop over comma-separated lists
+			if end != len(values) && values[end].TokenType != css.CommaToken {
+				continue
+			} else if start == end {
+				start++
+				continue
+			}
+
+			if end-start == 2 && values[start].TokenType == css.IdentToken && values[start+1].TokenType == css.IdentToken {
+				if values[start].Ident == values[start+1].Ident {
+					values = append(values[:start+1], values[start+2:]...)
+					end--
+				} else if values[start].Ident == Repeat && values[start+1].Ident == No_Repeat {
+					values[start].Data = repeatXBytes
+					values[start].Ident = Repeat_X
+					values = append(values[:start+1], values[start+2:]...)
+					end--
+				} else if values[start].Ident == No_Repeat && values[start+1].Ident == Repeat {
+					values[start].Data = repeatYBytes
+					values[start].Ident = Repeat_Y
+					values = append(values[:start+1], values[start+2:]...)
+					end--
+				}
+			}
+			start = end + 1
+		}
+	case Background_Position:
+		start := 0
+		for end := 0; end <= len(values); end++ { // loop over comma-separated lists
+			if end != len(values) && values[end].TokenType != css.CommaToken {
+				continue
+			} else if start == end {
+				start++
+				continue
+			}
+
+			if end-start == 3 || end-start == 4 {
+				// remove zero offsets
+				for _, i := range []int{end - start - 1, start + 1} {
+					if 2 < end-start && values[i].IsZero() {
+						values = append(values[:i], values[i+1:]...)
+						end--
+					}
+				}
+
+				j := start + 1 // position of second set of horizontal/vertical values
+				if 2 < end-start && values[start+2].TokenType == css.IdentToken {
+					j = start + 2
+				}
+
+				b := make([]byte, 0, 4)
+				offsets := make([]Token, 2)
+				for _, i := range []int{j, start} {
+					if i+1 < end && i+1 != j {
+						if values[i+1].TokenType == css.PercentageToken {
+							// change right or bottom with percentage offset to left or top respectively
+							if values[i].Ident == Right || values[i].Ident == Bottom {
+								n, _ := strconvParse.ParseInt(values[i+1].Data[:len(values[i+1].Data)-1])
+								b = strconv.AppendInt(b[:0], 100-n, 10)
+								b = append(b, '%')
+								values[i+1].Data = b
+								if values[i].Ident == Right {
+									values[i].Data = leftBytes
+									values[i].Ident = Left
+								} else {
+									values[i].Data = topBytes
+									values[i].Ident = Top
+								}
+							}
+						}
+						if values[i].Ident == Left {
+							offsets[0] = values[i+1]
+						} else if values[i].Ident == Top {
+							offsets[1] = values[i+1]
+						}
+					} else if values[i].Ident == Left {
+						offsets[0] = Token{css.NumberToken, zeroBytes, nil, 0, 0}
+					} else if values[i].Ident == Top {
+						offsets[1] = Token{css.NumberToken, zeroBytes, nil, 0, 0}
+					} else if values[i].Ident == Right {
+						offsets[0] = Token{css.PercentageToken, n100pBytes, nil, 0, 0}
+						values[i].Ident = Left
+					} else if values[i].Ident == Bottom {
+						offsets[1] = Token{css.PercentageToken, n100pBytes, nil, 0, 0}
+						values[i].Ident = Top
+					}
+				}
+
+				if values[start].Ident == Center || values[j].Ident == Center {
+					if values[start].Ident == Left || values[j].Ident == Left {
+						offsets = offsets[:1]
+					} else if values[start].Ident == Top || values[j].Ident == Top {
+						offsets[0] = Token{css.NumberToken, n50pBytes, nil, 0, 0}
+					}
+				}
+
+				if offsets[0].Data != nil && (len(offsets) == 1 || offsets[1].Data != nil) {
+					values = append(append(values[:start], offsets...), values[end:]...)
+					end -= end - start - len(offsets)
+				}
+			}
+			// removing zero offsets in the previous loop might make it eligible for the next loop
+			if end-start == 1 || end-start == 2 {
+				if end-start == 1 && (values[start].Ident == Top || values[start].Ident == Bottom) {
+					// we can't make this smaller, and converting to a number will break it
+					// (https://github.com/tdewolff/minify/issues/221#issuecomment-415419918)
+					break
+				}
+
+				if end-start == 2 && (values[start].Ident == Top || values[start].Ident == Bottom || values[start+1].Ident == Left || values[start+1].Ident == Right) {
+					// if it's a vertical position keyword, swap it with the next element
+					// since otherwise converted number positions won't be valid anymore
+					// (https://github.com/tdewolff/minify/issues/221#issue-353067229)
+					values[start], values[start+1] = values[start+1], values[start]
+				}
+
+				// transform keywords to lengths|percentages
+				for i := start; i < end; i++ {
+					if values[i].TokenType == css.IdentToken {
+						if values[i].Ident == Left || values[i].Ident == Top {
+							values[i].TokenType = css.NumberToken
+							values[i].Data = zeroBytes
+							values[i].Ident = 0
+						} else if values[i].Ident == Right || values[i].Ident == Bottom {
+							values[i].TokenType = css.PercentageToken
+							values[i].Data = n100pBytes
+							values[i].Ident = 0
+						} else if values[i].Ident == Center {
+							if i == start {
+								values[i].TokenType = css.PercentageToken
+								values[i].Data = n50pBytes
+								values[i].Ident = 0
+							} else {
+								values = append(values[:start+1], values[start+2:]...)
+								end--
+							}
+						}
+					} else if i == start+1 && values[i].TokenType == css.PercentageToken && bytes.Equal(values[i].Data, n50pBytes) {
+						values = append(values[:start+1], values[start+2:]...)
+						end--
+					} else if values[i].TokenType == css.PercentageToken && values[i].Data[0] == '0' {
+						values[i].TokenType = css.NumberToken
+						values[i].Data = zeroBytes
+						values[i].Ident = 0
+					}
+				}
+			}
+			start = end + 1
+		}
+	case Box_Shadow:
+		start := 0
+		for end := 0; end <= len(values); end++ { // loop over comma-separated lists
+			if end != len(values) && values[end].TokenType != css.CommaToken {
+				continue
+			} else if start == end {
+				start++
+				continue
+			}
+
+			if end-start == 1 && values[start].Ident == Initial {
+				values[start].Ident = None
+				values[start].Data = noneBytes
+			} else {
+				numbers := []int{}
+				for i := start; i < end; i++ {
+					if values[i].IsLength() {
+						numbers = append(numbers, i)
+					}
+				}
+				if len(numbers) == 4 && values[numbers[3]].IsZero() {
+					values = append(values[:numbers[3]], values[numbers[3]+1:]...)
+					numbers = numbers[:3]
+					end--
+				}
+				if len(numbers) == 3 && values[numbers[2]].IsZero() {
+					values = append(values[:numbers[2]], values[numbers[2]+1:]...)
+					end--
+				}
+			}
+			start = end + 1
+		}
+	case Ms_Filter:
+		alpha := []byte("progid:DXImageTransform.Microsoft.Alpha(Opacity=")
+		if values[0].TokenType == css.StringToken && 2 < len(values[0].Data) && bytes.HasPrefix(values[0].Data[1:len(values[0].Data)-1], alpha) {
+			values[0].Data = append(append([]byte{values[0].Data[0]}, []byte("alpha(opacity=")...), values[0].Data[1+len(alpha):]...)
+		}
+	case Color:
+		values[0] = minifyColor(values[0])
+	case Background_Color:
+		values[0] = minifyColor(values[0])
+		if !c.o.KeepCSS2 {
+			if values[0].Ident == Transparent {
+				values[0].Data = initialBytes
+				values[0].Ident = Initial
+			}
+		}
+	case Border_Color:
+		sameValues := true
+		for i := range values {
+			if values[i].Ident == Currentcolor {
+				values[i].Data = initialBytes
+				values[i].Ident = Initial
+			} else {
+				values[i] = minifyColor(values[i])
+			}
+			if 0 < i && sameValues && !bytes.Equal(values[0].Data, values[i].Data) {
+				sameValues = false
+			}
+		}
+		if sameValues {
+			values = values[:1]
+		}
+	case Border_Left_Color, Border_Right_Color, Border_Top_Color, Border_Bottom_Color, Text_Decoration_Color, Text_Emphasis_Color:
+		if values[0].Ident == Currentcolor {
+			values[0].Data = initialBytes
+			values[0].Ident = Initial
+		} else {
+			values[0] = minifyColor(values[0])
+		}
+	case Caret_Color, Outline_Color, Fill, Stroke:
+		values[0] = minifyColor(values[0])
+	case Column_Rule:
+		for i := 0; i < len(values); i++ {
+			if values[i].Ident == Currentcolor || values[i].Ident == None || values[i].Ident == Medium {
+				values = append(values[:i], values[i+1:]...)
+				i--
+			} else {
+				values[i] = minifyColor(values[i])
+			}
+		}
+		if len(values) == 0 {
+			values = []Token{{css.IdentToken, noneBytes, nil, 0, None}}
+		}
+	case Text_Shadow:
+		// TODO: minify better (can be comma separated list)
+		for i := 0; i < len(values); i++ {
+			values[i] = minifyColor(values[i])
+		}
+	case Text_Decoration:
+		for i := 0; i < len(values); i++ {
+			if values[i].Ident == Currentcolor || values[i].Ident == None || values[i].Ident == Solid {
+				values = append(values[:i], values[i+1:]...)
+				i--
+			} else {
+				values[i] = minifyColor(values[i])
+			}
+		}
+		if len(values) == 0 {
+			values = []Token{{css.IdentToken, noneBytes, nil, 0, None}}
+		}
+	case Text_Emphasis:
+		for i := 0; i < len(values); i++ {
+			if values[i].Ident == Currentcolor || values[i].Ident == None {
+				values = append(values[:i], values[i+1:]...)
+				i--
+			} else {
+				values[i] = minifyColor(values[i])
+			}
+		}
+		if len(values) == 0 {
+			values = []Token{{css.IdentToken, noneBytes, nil, 0, None}}
+		}
+	case Flex:
+		if len(values) == 2 && values[0].TokenType == css.NumberToken {
+			if values[1].TokenType != css.NumberToken && values[1].IsZero() {
+				values = values[:1] // remove <flex-basis> if it is zero
+			}
+		} else if len(values) == 3 && values[0].TokenType == css.NumberToken && values[1].TokenType == css.NumberToken {
+			if len(values[0].Data) == 1 && len(values[1].Data) == 1 {
+				if values[2].Ident == Auto {
+					if values[0].Data[0] == '0' && values[1].Data[0] == '1' {
+						values = values[:1]
+						values[0].TokenType = css.IdentToken
+						values[0].Data = initialBytes
+						values[0].Ident = Initial
+					} else if values[0].Data[0] == '1' && values[1].Data[0] == '1' {
+						values = values[:1]
+						values[0].TokenType = css.IdentToken
+						values[0].Data = autoBytes
+						values[0].Ident = Auto
+					} else if values[0].Data[0] == '0' && values[1].Data[0] == '0' {
+						values = values[:1]
+						values[0].TokenType = css.IdentToken
+						values[0].Data = noneBytes
+						values[0].Ident = None
+					}
+				} else if values[1].Data[0] == '1' && values[2].IsZero() {
+					values = values[:1] // remove <flex-shrink> and <flex-basis> if they are 1 and 0 respectively
+				} else if values[2].IsZero() {
+					values = values[:2] // remove auto to write 2-value syntax of <flex-grow> <flex-shrink>
+				} else {
+					values[2] = minifyLengthPercentage(values[2])
+				}
+			}
+		}
+	case Flex_Basis:
+		if values[0].Ident == Initial {
+			values[0].Data = autoBytes
+			values[0].Ident = Auto
+		} else {
+			values[0] = minifyLengthPercentage(values[0])
+		}
+	case Order, Flex_Grow:
+		if values[0].Ident == Initial {
+			values[0].TokenType = css.NumberToken
+			values[0].Data = zeroBytes
+			values[0].Ident = 0
+		}
+	case Flex_Shrink:
+		if values[0].Ident == Initial {
+			values[0].TokenType = css.NumberToken
+			values[0].Data = oneBytes
+			values[0].Ident = 0
+		}
+	case Unicode_Range:
+		ranges := [][2]int{}
+		for _, value := range values {
+			if value.TokenType == css.CommaToken {
+				continue
+			} else if value.TokenType != css.UnicodeRangeToken {
+				return values
+			}
+
+			i := 2
+			iWildcard := 0
+			start := 0
+			for i < len(value.Data) && value.Data[i] != '-' {
+				start *= 16
+				if '0' <= value.Data[i] && value.Data[i] <= '9' {
+					start += int(value.Data[i] - '0')
+				} else if 'a' <= value.Data[i]|32 && value.Data[i]|32 <= 'f' {
+					start += int(value.Data[i]|32-'a') + 10
+				} else if iWildcard == 0 && value.Data[i] == '?' {
+					iWildcard = i
+				}
+				i++
+			}
+			end := start
+			if iWildcard != 0 {
+				end = start + int(math.Pow(16.0, float64(len(value.Data)-iWildcard))) - 1
+			} else if i < len(value.Data) && value.Data[i] == '-' {
+				i++
+				end = 0
+				for i < len(value.Data) {
+					end *= 16
+					if '0' <= value.Data[i] && value.Data[i] <= '9' {
+						end += int(value.Data[i] - '0')
+					} else if 'a' <= value.Data[i]|32 && value.Data[i]|32 <= 'f' {
+						end += int(value.Data[i]|32-'a') + 10
+					}
+					i++
+				}
+				if end <= start {
+					end = start
+				}
+			}
+			ranges = append(ranges, [2]int{start, end})
+		}
+
+		// sort and remove overlapping ranges
+		sort.Slice(ranges, func(i, j int) bool { return ranges[i][0] < ranges[j][0] })
+		for i := 0; i < len(ranges)-1; i++ {
+			if ranges[i+1][1] <= ranges[i][1] {
+				// next range is fully contained in the current range
+				ranges = append(ranges[:i+1], ranges[i+2:]...)
+			} else if ranges[i+1][0] <= ranges[i][1]+1 {
+				// next range is partially covering the current range
+				ranges[i][1] = ranges[i+1][1]
+				ranges = append(ranges[:i+1], ranges[i+2:]...)
+			}
+		}
+
+		values = values[:0]
+		for i, ran := range ranges {
+			if i != 0 {
+				values = append(values, Token{css.CommaToken, commaBytes, nil, 0, None})
+			}
+			if ran[0] == ran[1] {
+				urange := []byte(fmt.Sprintf("U+%X", ran[0]))
+				values = append(values, Token{css.UnicodeRangeToken, urange, nil, 0, None})
+			} else if ran[0] == 0 && ran[1] == 0x10FFFF {
+				values = append(values, Token{css.IdentToken, initialBytes, nil, 0, None})
+			} else {
+				k := 0
+				for k < 6 && (ran[0]>>(k*4))&0xF == 0 && (ran[1]>>(k*4))&0xF == 0xF {
+					k++
+				}
+				wildcards := k
+				for k < 6 {
+					if (ran[0]>>(k*4))&0xF != (ran[1]>>(k*4))&0xF {
+						wildcards = 0
+						break
+					}
+					k++
+				}
+				var urange []byte
+				if wildcards != 0 {
+					if ran[0]>>(wildcards*4) == 0 {
+						urange = []byte(fmt.Sprintf("U+%s", strings.Repeat("?", wildcards)))
+					} else {
+						urange = []byte(fmt.Sprintf("U+%X%s", ran[0]>>(wildcards*4), strings.Repeat("?", wildcards)))
+					}
+				} else {
+					urange = []byte(fmt.Sprintf("U+%X-%X", ran[0], ran[1]))
+				}
+				values = append(values, Token{css.UnicodeRangeToken, urange, nil, 0, None})
+			}
+		}
+	}
+	return values
+}
+
+func minifyColor(value Token) Token {
+	data := value.Data
+	if value.TokenType == css.IdentToken {
+		if hexValue, ok := ShortenColorName[value.Ident]; ok {
+			value.TokenType = css.HashToken
+			value.Data = hexValue
+		}
+	} else if value.TokenType == css.HashToken {
+		parse.ToLower(data[1:])
+		if len(data) == 9 && data[7] == data[8] {
+			if data[7] == 'f' {
+				data = data[:7]
+			} else if data[7] == '0' {
+				data = blackBytes
+			}
+		}
+		if ident, ok := ShortenColorHex[string(data)]; ok {
+			value.TokenType = css.IdentToken
+			data = ident
+		} else if len(data) == 7 && data[1] == data[2] && data[3] == data[4] && data[5] == data[6] {
+			value.TokenType = css.HashToken
+			data[2] = data[3]
+			data[3] = data[5]
+			data = data[:4]
+		} else if len(data) == 9 && data[1] == data[2] && data[3] == data[4] && data[5] == data[6] && data[7] == data[8] {
+			// from working draft Color Module Level 4
+			value.TokenType = css.HashToken
+			data[2] = data[3]
+			data[3] = data[5]
+			data[4] = data[7]
+			data = data[:5]
+		}
+		value.Data = data
+	}
+	return value
+}
+
+func minifyNumberPercentage(value Token) Token {
+	// assumes input already minified
+	if value.TokenType == css.PercentageToken && len(value.Data) == 3 && value.Data[len(value.Data)-2] == '0' {
+		value.Data[1] = value.Data[0]
+		value.Data[0] = '.'
+		value.Data = value.Data[:2]
+		value.TokenType = css.NumberToken
+	} else if value.TokenType == css.NumberToken && 2 < len(value.Data) && value.Data[0] == '.' && value.Data[1] == '0' {
+		if value.Data[2] == '0' {
+			value.Data[0] = '.'
+			copy(value.Data[1:], value.Data[3:])
+			value.Data[len(value.Data)-2] = '%'
+			value.Data = value.Data[:len(value.Data)-1]
+			value.TokenType = css.PercentageToken
+		} else if len(value.Data) == 3 {
+			value.Data[0] = value.Data[2]
+			value.Data[1] = '%'
+			value.Data = value.Data[:2]
+			value.TokenType = css.PercentageToken
+		}
+	}
+	return value
+}
+
+func minifyLengthPercentage(value Token) Token {
+	if value.TokenType != css.NumberToken && value.IsZero() {
+		value.TokenType = css.NumberToken
+		value.Data = value.Data[:1] // remove dimension for zero value
+	}
+	return value
+}
+
+func (c *cssMinifier) minifyDimension(value Token) (Token, []byte) {
+	// TODO: add check for zero value
+	var dim []byte
+	if value.TokenType == css.DimensionToken {
+		n := len(value.Data)
+		for 0 < n {
+			lower := 'a' <= value.Data[n-1] && value.Data[n-1] <= 'z'
+			upper := 'A' <= value.Data[n-1] && value.Data[n-1] <= 'Z'
+			if !lower && !upper {
+				break
+			} else if upper {
+				value.Data[n-1] = value.Data[n-1] + ('a' - 'A')
+			}
+			n--
+		}
+
+		num := value.Data[:n]
+		if c.o.KeepCSS2 {
+			num = minify.Decimal(num, c.o.Precision) // don't use exponents
+		} else {
+			num = minify.Number(num, c.o.Precision)
+		}
+		dim = value.Data[n:]
+		value.Data = append(num, dim...)
+	}
+	return value, dim
+
+	// TODO: optimize
+	//if value.TokenType == css.DimensionToken {
+	//	// TODO: reverse; parse dim not number
+	//	n := parse.Number(value.Data)
+	//	num := value.Data[:n]
+	//	dim = value.Data[n:]
+	//	parse.ToLower(dim)
+
+	//	if c.o.KeepCSS2 {
+	//		num = minify.Decimal(num, c.o.Precision) // don't use exponents
+	//	} else {
+	//		num = minify.Number(num, c.o.Precision)
+	//	}
+
+	//	// change dimension to compress number
+	//	h := ToHash(dim)
+	//	if h == Px || h == Pt || h == Pc || h == In || h == Mm || h == Cm || h == Q || h == Deg || h == Grad || h == Rad || h == Turn || h == S || h == Ms || h == Hz || h == Khz || h == Dpi || h == Dpcm || h == Dppx {
+	//		d, _ := strconv.ParseFloat(string(num), 64) // can never fail
+	//		var dimensions []Hash
+	//		var multipliers []float64
+	//		switch h {
+	//		case Px:
+	//			//dimensions = []Hash{In, Cm, Pc, Mm, Pt, Q}
+	//			//multipliers = []float64{0.010416666666666667, 0.026458333333333333, 0.0625, 0.26458333333333333, 0.75, 1.0583333333333333}
+	//			dimensions = []Hash{In, Pc, Pt}
+	//			multipliers = []float64{0.010416666666666667, 0.0625, 0.75}
+	//		case Pt:
+	//			//dimensions = []Hash{In, Cm, Pc, Mm, Px, Q}
+	//			//multipliers = []float64{0.013888888888888889, 0.035277777777777778, 0.083333333333333333, 0.35277777777777778, 1.3333333333333333, 1.4111111111111111}
+	//			dimensions = []Hash{In, Pc, Px}
+	//			multipliers = []float64{0.013888888888888889, 0.083333333333333333, 1.3333333333333333}
+	//		case Pc:
+	//			//dimensions = []Hash{In, Cm, Mm, Pt, Px, Q}
+	//			//multipliers = []float64{0.16666666666666667, 0.42333333333333333, 4.2333333333333333, 12.0, 16.0, 16.933333333333333}
+	//			dimensions = []Hash{In, Pt, Px}
+	//			multipliers = []float64{0.16666666666666667, 12.0, 16.0}
+	//		case In:
+	//			//dimensions = []Hash{Cm, Pc, Mm, Pt, Px, Q}
+	//			//multipliers = []float64{2.54, 6.0, 25.4, 72.0, 96.0, 101.6}
+	//			dimensions = []Hash{Pc, Pt, Px}
+	//			multipliers = []float64{6.0, 72.0, 96.0}
+	//		case Cm:
+	//			//dimensions = []Hash{In, Pc, Mm, Pt, Px, Q}
+	//			//multipliers = []float64{0.39370078740157480, 2.3622047244094488, 10.0, 28.346456692913386, 37.795275590551181, 40.0}
+	//			dimensions = []Hash{Mm, Q}
+	//			multipliers = []float64{10.0, 40.0}
+	//		case Mm:
+	//			//dimensions = []Hash{In, Cm, Pc, Pt, Px, Q}
+	//			//multipliers = []float64{0.039370078740157480, 0.1, 0.23622047244094488, 2.8346456692913386, 3.7795275590551181, 4.0}
+	//			dimensions = []Hash{Cm, Q}
+	//			multipliers = []float64{0.1, 4.0}
+	//		case Q:
+	//			//dimensions = []Hash{In, Cm, Pc, Pt, Px} // Q to mm is never smaller
+	//			//multipliers = []float64{0.0098425196850393701, 0.025, 0.059055118110236220, 0.70866141732283465, 0.94488188976377953}
+	//			dimensions = []Hash{Cm} // Q to mm is never smaller
+	//			multipliers = []float64{0.025}
+	//		case Deg:
+	//			//dimensions = []Hash{Turn, Rad, Grad}
+	//			//multipliers = []float64{0.0027777777777777778, 0.017453292519943296, 1.1111111111111111}
+	//			dimensions = []Hash{Turn, Grad}
+	//			multipliers = []float64{0.0027777777777777778, 1.1111111111111111}
+	//		case Grad:
+	//			//dimensions = []Hash{Turn, Rad, Deg}
+	//			//multipliers = []float64{0.0025, 0.015707963267948966, 0.9}
+	//			dimensions = []Hash{Turn, Deg}
+	//			multipliers = []float64{0.0025, 0.9}
+	//		case Turn:
+	//			//dimensions = []Hash{Rad, Deg, Grad}
+	//			//multipliers = []float64{6.2831853071795865, 360.0, 400.0}
+	//			dimensions = []Hash{Deg, Grad}
+	//			multipliers = []float64{360.0, 400.0}
+	//		case Rad:
+	//			//dimensions = []Hash{Turn, Deg, Grad}
+	//			//multipliers = []float64{0.15915494309189534, 57.295779513082321, 63.661977236758134}
+	//		case S:
+	//			dimensions = []Hash{Ms}
+	//			multipliers = []float64{1000.0}
+	//		case Ms:
+	//			dimensions = []Hash{S}
+	//			multipliers = []float64{0.001}
+	//		case Hz:
+	//			dimensions = []Hash{Khz}
+	//			multipliers = []float64{0.001}
+	//		case Khz:
+	//			dimensions = []Hash{Hz}
+	//			multipliers = []float64{1000.0}
+	//		case Dpi:
+	//			dimensions = []Hash{Dppx, Dpcm}
+	//			multipliers = []float64{0.010416666666666667, 0.39370078740157480}
+	//		case Dpcm:
+	//			//dimensions = []Hash{Dppx, Dpi}
+	//			//multipliers = []float64{0.026458333333333333, 2.54}
+	//			dimensions = []Hash{Dpi}
+	//			multipliers = []float64{2.54}
+	//		case Dppx:
+	//			//dimensions = []Hash{Dpcm, Dpi}
+	//			//multipliers = []float64{37.795275590551181, 96.0}
+	//			dimensions = []Hash{Dpi}
+	//			multipliers = []float64{96.0}
+	//		}
+	//		for i := range dimensions {
+	//			if dimensions[i] != h { //&& (d < 1.0) == (multipliers[i] > 1.0) {
+	//				b, _ := strconvParse.AppendFloat([]byte{}, d*multipliers[i], -1)
+	//				if c.o.KeepCSS2 {
+	//					b = minify.Decimal(b, c.o.newPrecision) // don't use exponents
+	//				} else {
+	//					b = minify.Number(b, c.o.newPrecision)
+	//				}
+	//				newDim := []byte(dimensions[i].String())
+	//				if len(b)+len(newDim) < len(num)+len(dim) {
+	//					num = b
+	//					dim = newDim
+	//				}
+	//			}
+	//		}
+	//	}
+	//	value.Data = append(num, dim...)
+	//}
+	//return value, dim
+}