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Copy pathcss.go
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950 lines (896 loc) · 29.1 KB
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// Package css minifies CSS3 following the specifications at http://www.w3.org/TR/css-syntax-3/.
package css // import "github.com/tdewolff/minify/css"
import (
"bytes"
"encoding/hex"
"fmt"
"io"
"strconv"
"github.com/tdewolff/minify/v2"
"github.com/tdewolff/parse/v2"
"github.com/tdewolff/parse/v2/css"
)
var (
spaceBytes = []byte(" ")
colonBytes = []byte(":")
semicolonBytes = []byte(";")
commaBytes = []byte(",")
leftBracketBytes = []byte("{")
rightBracketBytes = []byte("}")
zeroBytes = []byte("0")
transparentBytes = []byte("transparent")
importantBytes = []byte("!important")
)
type cssMinifier struct {
m *minify.M
w io.Writer
p *css.Parser
o *Minifier
valuesBuffer []Token
}
////////////////////////////////////////////////////////////////
// DefaultMinifier is the default minifier.
var DefaultMinifier = &Minifier{Decimals: -1, KeepCSS2: false}
// Minifier is a CSS minifier.
type Minifier struct {
Decimals int
KeepCSS2 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 DefaultMinifier.Minify(m, w, r, params)
}
// 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 {
isInline := params != nil && params["inline"] == "1"
c := &cssMinifier{
m: m,
w: w,
p: css.NewParser(r, isInline),
o: o,
}
defer c.p.Restore()
if err := c.minifyGrammar(); err != nil && err != io.EOF {
return err
}
return nil
}
func (c *cssMinifier) minifyGrammar() error {
semicolonQueued := false
for {
gt, _, data := c.p.Next()
switch gt {
case css.ErrorGrammar:
if perr, ok := c.p.Err().(*parse.Error); ok && perr.Message == "unexpected token in declaration" {
if semicolonQueued {
if _, err := c.w.Write(semicolonBytes); err != nil {
return err
}
}
// write out the offending declaration
if _, err := c.w.Write(data); err != nil {
return err
}
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 {
if _, err := c.w.Write(val.Data); err != nil {
return err
}
}
continue
}
return c.p.Err()
case css.EndAtRuleGrammar, css.EndRulesetGrammar:
if _, err := c.w.Write(rightBracketBytes); err != nil {
return err
}
semicolonQueued = false
continue
}
if semicolonQueued {
if _, err := c.w.Write(semicolonBytes); err != nil {
return err
}
semicolonQueued = false
}
switch gt {
case css.AtRuleGrammar:
if _, err := c.w.Write(data); err != nil {
return err
}
values := c.p.Values()
if css.ToHash(data[1:]) == css.Import && len(values) == 2 && values[1].TokenType == css.URLToken {
url := values[1].Data
if url[4] != '"' && url[4] != '\'' {
url = url[3:]
url[0] = '"'
url[len(url)-1] = '"'
} else {
url = url[4 : len(url)-1]
}
values[1].Data = url
}
for _, val := range values {
if _, err := c.w.Write(val.Data); err != nil {
return err
}
}
semicolonQueued = true
case css.BeginAtRuleGrammar:
if _, err := c.w.Write(data); err != nil {
return err
}
for _, val := range c.p.Values() {
if _, err := c.w.Write(val.Data); err != nil {
return err
}
}
if _, err := c.w.Write(leftBracketBytes); err != nil {
return err
}
case css.QualifiedRuleGrammar:
if err := c.minifySelectors(data, c.p.Values()); err != nil {
return err
}
if _, err := c.w.Write(commaBytes); err != nil {
return err
}
case css.BeginRulesetGrammar:
if err := c.minifySelectors(data, c.p.Values()); err != nil {
return err
}
if _, err := c.w.Write(leftBracketBytes); err != nil {
return err
}
case css.DeclarationGrammar:
if _, err := c.w.Write(data); err != nil {
return err
}
if _, err := c.w.Write(colonBytes); err != nil {
return err
}
if err := c.minifyDeclaration(data, c.p.Values()); err != nil {
return err
}
semicolonQueued = true
case css.CustomPropertyGrammar:
if _, err := c.w.Write(data); err != nil {
return err
}
if _, err := c.w.Write(colonBytes); err != nil {
return err
}
if _, err := c.w.Write(c.p.Values()[0].Data); err != nil {
return err
}
semicolonQueued = true
case css.CommentGrammar:
if len(data) > 5 && data[1] == '*' && data[2] == '!' {
if _, err := c.w.Write(data[:3]); err != nil {
return err
}
comment := parse.TrimWhitespace(parse.ReplaceMultipleWhitespace(data[3 : len(data)-2]))
if _, err := c.w.Write(comment); err != nil {
return err
}
if _, err := c.w.Write(data[len(data)-2:]); err != nil {
return err
}
}
default:
if _, err := c.w.Write(data); err != nil {
return err
}
}
}
}
func (c *cssMinifier) minifySelectors(property []byte, values []css.Token) error {
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) {
if _, err := c.w.Write(s); err != nil {
return err
}
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') {
if _, err := c.w.Write(spaceBytes); err != nil {
return err
}
}
}
if _, err := c.w.Write(val.Data); err != nil {
return err
}
}
return nil
}
type Token struct {
css.TokenType
Data []byte
Components []css.Token // only filled for functions
}
func (t Token) String() string {
if len(t.Components) == 0 {
return t.TokenType.String() + "(" + string(t.Data) + ")"
}
return fmt.Sprint(t.Components)
}
func (a Token) Equal(b Token) bool {
if a.TokenType == b.TokenType && bytes.Equal(a.Data, b.Data) && len(a.Components) == len(b.Components) {
for i := 0; i < len(a.Components); i++ {
if a.Components[i].TokenType != b.Components[i].TokenType || !bytes.Equal(a.Components[i].Data, b.Components[i].Data) {
return false
}
}
return true
}
return false
}
func (c *cssMinifier) minifyDeclaration(property []byte, components []css.Token) error {
if len(components) == 0 {
return nil
}
// 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] == '!' && css.ToHash(components[len(components)-1].Data) == css.Important {
components = components[:len(components)-2]
important = true
}
// Check if this is a simple list of values separated by whitespace or commas, otherwise we'll not be processing
simple := true
prevSep := true
values := c.valuesBuffer[:0]
for i := 0; i < len(components); i++ {
comp := components[i]
tt := comp.TokenType
if tt == css.LeftParenthesisToken || tt == css.LeftBraceToken || tt == css.LeftBracketToken ||
tt == css.RightParenthesisToken || tt == css.RightBraceToken || tt == css.RightBracketToken {
simple = false
break
}
if !prevSep && tt != css.WhitespaceToken && tt != css.CommaToken && (tt != css.DelimToken || comp.Data[0] != '/') {
simple = false
break
}
if tt == css.WhitespaceToken || tt == css.CommaToken || tt == css.DelimToken && comp.Data[0] == '/' {
prevSep = true
if tt != css.WhitespaceToken {
values = append(values, Token{tt, comp.Data, nil})
}
} else if tt == css.FunctionToken {
prevSep = false
j := i + 1
level := 0
for ; j < len(components); j++ {
if components[j].TokenType == css.LeftParenthesisToken {
level++
} else if components[j].TokenType == css.RightParenthesisToken {
if level == 0 {
j++
break
}
level--
}
}
values = append(values, Token{components[i].TokenType, components[i].Data, components[i:j]})
i = j - 1
} else {
prevSep = false
values = append(values, Token{components[i].TokenType, components[i].Data, nil})
}
}
c.valuesBuffer = values
prop := css.ToHash(property)
// Do not process complex values (eg. containing blocks or is not alternated between whitespace/commas and flat values
if !simple {
if prop == css.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 {
if _, err := c.w.Write(component.Data); err != nil {
return err
}
}
if important {
if _, err := c.w.Write(importantBytes); err != nil {
return err
}
}
return nil
}
for i := range values {
values[i].TokenType, values[i].Data = c.shortenToken(prop, values[i].TokenType, values[i].Data)
}
if len(values) > 0 {
values = c.minifyProperty(prop, values)
}
prevSep = true
for _, value := range values {
if !prevSep && value.TokenType != css.CommaToken && (value.TokenType != css.DelimToken || value.Data[0] != '/') {
if _, err := c.w.Write(spaceBytes); err != nil {
return err
}
}
if value.TokenType == css.FunctionToken {
err := c.minifyFunction(value.Components)
if err != nil {
return err
}
} else if _, err := c.w.Write(value.Data); err != nil {
return err
}
if value.TokenType == css.CommaToken || value.TokenType == css.DelimToken && value.Data[0] == '/' {
prevSep = true
} else {
prevSep = false
}
}
if important {
if _, err := c.w.Write(importantBytes); err != nil {
return err
}
}
return nil
}
func (c *cssMinifier) minifyProperty(prop css.Hash, values []Token) []Token {
switch prop {
case css.Font:
if len(values) > 1 {
// the font-families are separated by commas and are at the end of font
// get index for the first font-family given
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 values[i].TokenType == css.IdentToken {
h := css.ToHash(values[i].Data)
// inherit, initial and unset are followed by an IdentToken/StringToken, so must be for font-size
if h == css.Xx_Small || h == css.X_Small || h == css.Small || h == css.Medium || h == css.Large || h == css.X_Large || h == css.Xx_Large || h == css.Smaller || h == css.Larger || h == css.Inherit || h == css.Initial || h == css.Unset {
break
}
}
}
// font-family minified in place
values = append(values[:i+1], c.minifyProperty(css.Font_Family, values[i+1:])...)
if i > 0 {
// line-height
if i > 1 && values[i-1].TokenType == css.DelimToken && values[i-1].Data[0] == '/' {
if values[i].TokenType == css.IdentToken && bytes.Equal(values[i].Data, []byte("normal")) {
values = append(values[:i-1], values[i+1:]...)
}
i -= 2
}
// font-size
i--
for ; i > -1; i-- {
if values[i].TokenType == css.IdentToken {
val := css.ToHash(values[i].Data)
if val == css.Normal {
values = append(values[:i], values[i+1:]...)
} else if val == css.Bold {
values[i].TokenType = css.NumberToken
values[i].Data = []byte("700")
}
} else if values[i].TokenType == css.NumberToken && bytes.Equal(values[i].Data, []byte("400")) {
values = append(values[:i], values[i+1:]...)
}
}
}
}
case css.Font_Family:
for i, value := range values {
if value.TokenType == css.StringToken && len(value.Data) > 2 {
unquote := true
parse.ToLower(value.Data)
s := value.Data[1 : len(value.Data)-1]
if len(s) > 0 {
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 css.Font_Weight:
if len(values) == 1 && values[0].TokenType == css.IdentToken {
val := css.ToHash(values[0].Data)
if val == css.Normal {
values[0].TokenType = css.NumberToken
values[0].Data = []byte("400")
} else if val == css.Bold {
values[0].TokenType = css.NumberToken
values[0].Data = []byte("700")
}
}
case css.Margin, css.Padding, css.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 css.Border, css.Border_Bottom, css.Border_Left, css.Border_Right, css.Border_Top:
for i := 0; i < len(values); i++ {
if values[i].TokenType == css.IdentToken {
val := css.ToHash(values[i].Data)
if val == css.None || val == css.Currentcolor || val == css.Medium {
values = append(values[:i], values[i+1:]...)
i--
}
}
}
if len(values) == 0 {
values = []Token{{css.IdentToken, []byte("none"), nil}}
}
case css.Outline:
for i := 0; i < len(values); i++ {
if values[i].TokenType == css.IdentToken {
val := css.ToHash(values[i].Data)
if val == css.None || val == css.Medium { // color=invert is not supported by all browsers
values = append(values[:i], values[i+1:]...)
i--
}
}
}
if len(values) == 0 {
values = []Token{{css.IdentToken, []byte("none"), nil}}
}
case css.Background:
hasSize := false
for i := 0; i < len(values); i++ {
if values[i].TokenType == css.DelimToken && values[i].Data[0] == '/' {
hasSize = true
if i+1 < len(values) && (values[i+1].TokenType == css.NumberToken || values[i+1].TokenType == css.PercentageToken || values[i+1].TokenType == css.IdentToken && bytes.Equal(values[i+1].Data, []byte("auto"))) {
if i+2 < len(values) && (values[i+2].TokenType == css.NumberToken || values[i+2].TokenType == css.PercentageToken || values[i+2].TokenType == css.IdentToken && bytes.Equal(values[i+2].Data, []byte("auto"))) {
sizeValues := c.minifyProperty(css.Background_Size, values[i+1:i+3])
if len(sizeValues) == 1 && bytes.Equal(sizeValues[0].Data, []byte("auto")) {
values = append(values[:i], values[i+3:]...)
hasSize = false
i--
} else {
values = append(values[:i+1], append(sizeValues, values[i+3:]...)...)
i += len(sizeValues) - 1
}
} else if values[i+1].TokenType == css.IdentToken && bytes.Equal(values[i+1].Data, []byte("auto")) {
values = append(values[:i], values[i+2:]...)
hasSize = false
i--
}
}
}
}
var h css.Hash
iPaddingBox := -1 // position of background-origin that is padding-box
for i := 0; i < len(values); i++ {
if values[i].TokenType == css.IdentToken {
h = css.ToHash(values[i].Data)
if i+1 < len(values) && values[i+1].TokenType == css.IdentToken && (h == css.Space || h == css.Round || h == css.Repeat || h == css.No_Repeat) {
if h2 := css.ToHash(values[i+1].Data); h2 == css.Space || h2 == css.Round || h2 == css.Repeat || h2 == css.No_Repeat {
repeatValues := c.minifyProperty(css.Background_Repeat, values[i:i+2])
if len(repeatValues) == 1 && bytes.Equal(repeatValues[0].Data, []byte("repeat")) {
values = append(values[:i], values[i+2:]...)
i--
} else {
values = append(values[:i], append(repeatValues, values[i+2:]...)...)
i += len(repeatValues) - 1
}
continue
}
} else if h == css.None || h == css.Scroll || h == css.Transparent {
values = append(values[:i], values[i+1:]...)
i--
continue
} else if h == css.Border_Box || h == css.Padding_Box {
if iPaddingBox == -1 && h == css.Padding_Box { // background-origin
iPaddingBox = i
} else if iPaddingBox != -1 && h == css.Border_Box { // background-clip
values = append(values[:i], values[i+1:]...)
values = append(values[:iPaddingBox], values[iPaddingBox+1:]...)
i -= 2
}
continue
}
} else if values[i].TokenType == css.HashToken && bytes.Equal(values[i].Data, []byte("#0000")) {
values = append(values[:i], values[i+1:]...)
i--
continue
}
if values[i].TokenType == css.NumberToken || values[i].TokenType == css.PercentageToken || values[i].TokenType == css.IdentToken && (h == css.Left || h == css.Right || h == css.Top || h == css.Bottom || h == css.Center) {
j := i + 1
for ; j < len(values); j++ {
if values[j].TokenType == css.IdentToken {
h := css.ToHash(values[j].Data)
if h == css.Left || h == css.Right || h == css.Top || h == css.Bottom || h == css.Center {
continue
}
} else if values[j].TokenType == css.NumberToken || values[j].TokenType == css.PercentageToken {
continue
}
break
}
positionValues := c.minifyProperty(css.Background_Position, values[i:j])
if !hasSize && len(positionValues) == 2 && positionValues[0].TokenType == css.NumberToken && bytes.Equal(positionValues[0].Data, []byte("0")) && positionValues[0].Equal(positionValues[1]) {
values = append(values[:i], values[j:]...)
i--
} else {
values = append(values[:i], append(positionValues, values[j:]...)...)
i += len(positionValues) - 1
}
}
}
if len(values) == 0 {
values = []Token{{css.NumberToken, []byte("0"), nil}, {css.NumberToken, []byte("0"), nil}}
}
case css.Background_Size:
if len(values) == 2 && values[1].TokenType == css.IdentToken && bytes.Equal(values[1].Data, []byte("auto")) {
values = values[:1]
}
case css.Background_Repeat:
if len(values) == 2 && values[0].TokenType == css.IdentToken && values[1].TokenType == css.IdentToken {
h0 := css.ToHash(values[0].Data)
h1 := css.ToHash(values[1].Data)
if h0 == h1 {
values = values[:1]
} else if h0 == css.Repeat && h1 == css.No_Repeat {
values = values[:1]
values[0].Data = []byte("repeat-x")
} else if h0 == css.No_Repeat && h1 == css.Repeat {
values = values[:1]
values[0].Data = []byte("repeat-y")
}
}
case css.Background_Position:
if len(values) == 3 || len(values) == 4 {
// remove zero offsets
for i := 0; i < len(values); i++ {
if values[i].TokenType == css.IdentToken {
h := css.ToHash(values[i].Data)
if h == css.Left || h == css.Top || h == css.Right || h == css.Bottom {
if i+1 < len(values) {
if values[i+1].TokenType == css.NumberToken && bytes.Equal(values[i+1].Data, []byte("0")) || values[i+1].TokenType == css.PercentageToken && bytes.Equal(values[i+1].Data, []byte("0%")) {
values = append(values[:i+1], values[i+2:]...)
} else {
i++
}
}
}
}
}
}
// removing zero offsets in the previous loop might make it eligible for the next loop
if len(values) == 1 || len(values) == 2 {
if values[0].TokenType == css.IdentToken {
h := css.ToHash(values[0].Data)
if h == css.Top || h == css.Bottom {
if len(values) == 1 {
// 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 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[0], values[1] = values[1], values[0]
}
}
// transform keywords to lengths|percentages
for i := 0; i < len(values); i++ {
if values[i].TokenType == css.IdentToken {
h := css.ToHash(values[i].Data)
if h == css.Left || h == css.Top {
values[i].TokenType = css.NumberToken
values[i].Data = []byte("0")
} else if h == css.Right || h == css.Bottom {
values[i].TokenType = css.PercentageToken
values[i].Data = []byte("100%")
} else if h == css.Center {
if i == 0 {
values[i].TokenType = css.PercentageToken
values[i].Data = []byte("50%")
} else {
values = values[:1]
}
}
} else if i == 1 && values[i].TokenType == css.PercentageToken && bytes.Equal(values[i].Data, []byte("50%")) {
values = values[:1]
} else if values[i].TokenType == css.PercentageToken && bytes.Equal(values[i].Data, []byte("0%")) {
values[i].TokenType = css.NumberToken
values[i].Data = []byte("0")
}
}
}
case css.Box_Shadow:
if len(values) == 4 && len(values[0].Data) == 1 && values[0].Data[0] == '0' && len(values[1].Data) == 1 && values[1].Data[0] == '0' && len(values[2].Data) == 1 && values[2].Data[0] == '0' && len(values[3].Data) == 1 && values[3].Data[0] == '0' {
values = values[:2]
}
case css.Ms_Filter:
alpha := []byte("progid:DXImageTransform.Microsoft.Alpha(Opacity=")
if values[0].TokenType == css.StringToken && 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):]...)
}
}
return values
}
func (c *cssMinifier) minifyColorAsHex(rgba [3]byte) error {
val := make([]byte, 7)
val[0] = '#'
hex.Encode(val[1:], rgba[:])
parse.ToLower(val)
if s, ok := ShortenColorHex[string(val[:7])]; ok {
if _, err := c.w.Write(s); err != nil {
return err
}
return nil
} else if val[1] == val[2] && val[3] == val[4] && val[5] == val[6] {
val[2] = val[3]
val[3] = val[5]
val = val[:4]
} else {
val = val[:7]
}
_, err := c.w.Write(val)
return err
}
func (c *cssMinifier) minifyFunction(values []css.Token) error {
if n := len(values); n > 2 {
fun := css.ToHash(values[0].Data[0 : len(values[0].Data)-1])
if fun == css.Rgb || fun == css.Rgba || fun == css.Hsl || fun == css.Hsla {
valid := true
vals := make([]*css.Token, 0, 4)
for i, value := range values[1 : n-1] {
numeric := value.TokenType == css.NumberToken || value.TokenType == css.PercentageToken
separator := value.TokenType == css.CommaToken || i != 5 && value.TokenType == css.WhitespaceToken || i == 5 && value.TokenType == css.DelimToken && value.Data[0] == '/'
if i%2 == 0 && !numeric || i%2 == 1 && !separator {
valid = false
} else if numeric {
vals = append(vals, &values[i+1])
}
}
if valid {
for _, val := range vals {
val.TokenType, val.Data = c.shortenToken(0, val.TokenType, val.Data)
}
a := byte(255)
if len(vals) == 4 {
d, _ := strconv.ParseFloat(string(values[7].Data), 32) // can never fail because if valid == true than this is a NumberToken or PercentageToken
if d < minify.Epsilon { // zero or less
_, err := c.w.Write(transparentBytes)
return err
} else if d >= 1.0 {
values = values[:7]
} else {
a = byte(d*255.0 + 0.5)
}
}
if a == 255 { // only minify color if fully opaque
if (fun == css.Rgb || fun == css.Rgba) && (len(vals) == 3 || len(vals) == 4) {
rgb := [3]byte{}
for j, val := range vals[:3] {
if val.TokenType == css.NumberToken {
d, _ := strconv.ParseInt(string(val.Data), 10, 32)
if d < 0 {
d = 0
} else if d > 255 {
d = 255
}
rgb[j] = byte(d)
} else if val.TokenType == css.PercentageToken {
d, _ := strconv.ParseFloat(string(val.Data[:len(val.Data)-1]), 32)
if d < 0.0 {
d = 0.0
} else if d > 100.0 {
d = 100.0
}
rgb[j] = byte((d / 100.0 * 255.0) + 0.5)
}
}
return c.minifyColorAsHex(rgb)
} else if (fun == css.Hsl || fun == css.Hsla) && (len(vals) == 3 || len(vals) == 4) && vals[0].TokenType == css.NumberToken && vals[1].TokenType == css.PercentageToken && vals[2].TokenType == css.PercentageToken {
h, _ := strconv.ParseFloat(string(vals[0].Data), 32)
s, _ := strconv.ParseFloat(string(vals[1].Data[:len(vals[1].Data)-1]), 32)
l, _ := strconv.ParseFloat(string(vals[2].Data[:len(vals[2].Data)-1]), 32)
for h > 360.0 {
h -= 360.0
}
if s < 0.0 {
s = 0.0
} else if s > 100.0 {
s = 100.0
}
if l < 0.0 {
l = 0.0
} else if l > 100.0 {
l = 100.0
}
r, g, b := css.HSL2RGB(h/360.0, s/100.0, l/100.0)
rgb := [3]byte{byte((r * 255.0) + 0.5), byte((g * 255.0) + 0.5), byte((b * 255.0) + 0.5)}
return c.minifyColorAsHex(rgb)
}
}
}
} else if fun == css.Local && n == 3 {
data := values[1].Data
if data[0] == '\'' || data[0] == '"' {
data = removeStringNewlinex(data)
if css.IsURLUnquoted(data[1 : len(data)-1]) {
data = data[1 : len(data)-1]
}
values[1].Data = data
}
}
}
for _, value := range values {
if _, err := c.w.Write(value.Data); err != nil {
return err
}
}
return nil
}
func (c *cssMinifier) shortenToken(prop css.Hash, tt css.TokenType, data []byte) (css.TokenType, []byte) {
switch tt {
case css.NumberToken, css.PercentageToken, css.DimensionToken:
if tt == css.NumberToken && (prop == css.Z_Index || prop == css.Counter_Increment || prop == css.Counter_Reset || prop == css.Orphans || prop == css.Widows) {
return tt, data // integers
}
n := len(data)
if tt == css.PercentageToken {
n--
} else if tt == css.DimensionToken {
n = parse.Number(data)
}
dim := data[n:]
parse.ToLower(dim)
if !c.o.KeepCSS2 {
data = minify.Number(data[:n], c.o.Decimals)
} else {
data = minify.Decimal(data[:n], c.o.Decimals) // don't use exponents
}
if tt == css.DimensionToken && (len(data) != 1 || data[0] != '0' || !optionalZeroDimension[string(dim)] || prop == css.Flex) {
data = append(data, dim...)
} else if tt == css.PercentageToken {
data = append(data, '%') // TODO: drop percentage for properties that accept <percentage> and <length>
}
case css.IdentToken:
parse.ToLower(parse.Copy(data)) // not all identifiers are case-insensitive; all <custom-ident> properties are case-sensitive
hash := css.ToHash(data)
if hexValue, ok := ShortenColorName[hash]; ok {
tt = css.HashToken
data = hexValue
}
case css.HashToken:
parse.ToLower(data)
if len(data) == 9 && data[7] == data[8] {
if data[7] == 'f' {
data = data[:7]
} else if data[7] == '0' {
data = []byte("#0000")
}
}
if ident, ok := ShortenColorHex[string(data)]; ok {
tt = css.IdentToken
data = ident
} else if len(data) == 7 && data[1] == data[2] && data[3] == data[4] && data[5] == data[6] {
tt = 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
tt = css.HashToken
data[2] = data[3]
data[3] = data[5]
data[4] = data[7]
data = data[:5]
}
case css.StringToken:
data = removeStringNewlinex(data)
case css.URLToken:
parse.ToLower(data[:3])
if len(data) > 10 {
uri := parse.TrimWhitespace(data[4 : len(data)-1])
delim := byte('"')
if uri[0] == '\'' || uri[0] == '"' {
delim = uri[0]
uri = removeStringNewlinex(uri)
uri = uri[1 : len(uri)-1]
}
uri = minify.DataURI(c.m, uri)
if css.IsURLUnquoted(uri) {
data = append(append([]byte("url("), uri...), ')')
} else {
data = append(append(append([]byte("url("), delim), uri...), delim, ')')
}
}
}
return tt, data
}
func removeStringNewlinex(data []byte) []byte {
// remove any \\\r\n \\\r \\\n
for i := 1; i < len(data)-2; i++ {
if data[i] == '\\' && (data[i+1] == '\n' || data[i+1] == '\r') {
// encountered first replacee, now start to move bytes to the front
j := i + 2
if data[i+1] == '\r' && len(data) > i+2 && data[i+2] == '\n' {
j++
}
for ; j < len(data); j++ {
if data[j] == '\\' && len(data) > j+1 && (data[j+1] == '\n' || data[j+1] == '\r') {
if data[j+1] == '\r' && len(data) > j+2 && data[j+2] == '\n' {
j++
}
j++
} else {
data[i] = data[j]
i++
}
}
data = data[:i]
break
}
}
return data
}