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Copy pathcss.go
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1568 lines (1486 loc) · 49.4 KB
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// 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(")
varBytes = []byte("var(")
zeroBytes = []byte("0")
>
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
Inline bool
}
// 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) + ")"
}
sb := strings.Builder{}
sb.Write(t.Data)
for _, arg := range t.Args {
sb.WriteString(arg.String())
}
sb.WriteByte(')')
return sb.String()
}
// 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].Equal(t2.Args[i]) {
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 {
tmp := &Minifier{}
*tmp = *o
o = tmp
o.newPrecision = o.Precision
if o.newPrecision <= 0 || 15 < o.newPrecision {
o.newPrecision = 15 // minimum number of digits a double can represent exactly
}
if !o.Inline {
o.Inline = params != nil && params["inline"] == "1"
}
z := parse.NewInput(r)
defer z.Restore()
c := &cssMinifier{
m: m,
w: w,
p: css.NewParser(z, o.Inline),
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 5 < len(data) && 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:])
} else if 5 < len(data) && (data[2] == '#' || data[2] == '@') {
c.w.Write(data) // sourceMappingURL
}
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)
}
10000
return
}
values = c.minifyTokens(prop, 0, values)
if 0 < len(values) {
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
} else if values[i].TokenType == css.FunctionToken && bytes.Equal(values[i].Data, varBytes) {
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, '%')