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Diffstat (limited to 'vendor/github.com/tdewolff/minify/css/css.go')
-rw-r--r--vendor/github.com/tdewolff/minify/css/css.go559
1 files changed, 559 insertions, 0 deletions
diff --git a/vendor/github.com/tdewolff/minify/css/css.go b/vendor/github.com/tdewolff/minify/css/css.go
new file mode 100644
index 0000000..de0a8c8
--- /dev/null
+++ b/vendor/github.com/tdewolff/minify/css/css.go
@@ -0,0 +1,559 @@
+// 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"
+ "io"
+ "strconv"
+
+ "github.com/tdewolff/minify"
+ "github.com/tdewolff/parse"
+ "github.com/tdewolff/parse/css"
+)
+
+var (
+ spaceBytes = []byte(" ")
+ colonBytes = []byte(":")
+ semicolonBytes = []byte(";")
+ commaBytes = []byte(",")
+ leftBracketBytes = []byte("{")
+ rightBracketBytes = []byte("}")
+ zeroBytes = []byte("0")
+ msfilterBytes = []byte("-ms-filter")
+ backgroundNoneBytes = []byte("0 0")
+)
+
+type cssMinifier struct {
+ m *minify.M
+ w io.Writer
+ p *css.Parser
+ o *Minifier
+}
+
+////////////////////////////////////////////////////////////////
+
+// DefaultMinifier is the default minifier.
+var DefaultMinifier = &Minifier{Decimals: -1}
+
+// Minifier is a CSS minifier.
+type Minifier struct {
+ Decimals int
+}
+
+// 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()
+ if gt == 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
+ }
+ for _, val := range c.p.Values() {
+ if _, err := c.w.Write(val.Data); err != nil {
+ return err
+ }
+ }
+ semicolonQueued = true
+ continue
+ } else {
+ return c.p.Err()
+ }
+ } else if gt == css.EndAtRuleGrammar || gt == 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
+ }
+
+ if gt == css.AtRuleGrammar {
+ 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
+ }
+ }
+ semicolonQueued = true
+ } else if gt == 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
+ }
+ } else if gt == css.QualifiedRuleGrammar {
+ if err := c.minifySelectors(data, c.p.Values()); err != nil {
+ return err
+ }
+ if _, err := c.w.Write(commaBytes); err != nil {
+ return err
+ }
+ } else if gt == css.BeginRulesetGrammar {
+ if err := c.minifySelectors(data, c.p.Values()); err != nil {
+ return err
+ }
+ if _, err := c.w.Write(leftBracketBytes); err != nil {
+ return err
+ }
+ } else if gt == 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
+ } else if gt == 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
+ } else if gt == 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
+ }
+ }
+ } else 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([]byte(s)) {
+ if _, err := c.w.Write(s); err != nil {
+ return err
+ }
+ continue
+ }
+ } else if val.TokenType == css.RightBracketToken {
+ inAttr = false
+ }
+ }
+ if _, err := c.w.Write(val.Data); err != nil {
+ return err
+ }
+ }
+ return nil
+}
+
+func (c *cssMinifier) minifyDeclaration(property []byte, values []css.Token) error {
+ if len(values) == 0 {
+ return nil
+ }
+ prop := css.ToHash(property)
+ inProgid := false
+ for i, value := range values {
+ if inProgid {
+ if value.TokenType == css.FunctionToken {
+ inProgid = false
+ }
+ continue
+ } else if value.TokenType == css.IdentToken && css.ToHash(value.Data) == css.Progid {
+ inProgid = true
+ continue
+ }
+ value.TokenType, value.Data = c.shortenToken(prop, value.TokenType, value.Data)
+ if prop == css.Font || prop == css.Font_Family || prop == css.Font_Weight {
+ if value.TokenType == css.IdentToken && (prop == css.Font || prop == css.Font_Weight) {
+ val := css.ToHash(value.Data)
+ if val == css.Normal && prop == css.Font_Weight {
+ // normal could also be specified for font-variant, not just font-weight
+ value.TokenType = css.NumberToken
+ value.Data = []byte("400")
+ } else if val == css.Bold {
+ value.TokenType = css.NumberToken
+ value.Data = []byte("700")
+ }
+ } else if value.TokenType == css.StringToken && (prop == css.Font || prop == css.Font_Family) && 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) {
+ val := css.ToHash(split)
+ // if len is zero, it contains two consecutive spaces
+ if val == css.Inherit || val == css.Serif || val == css.Sans_Serif || val == css.Monospace || val == css.Fantasy || val == css.Cursive || val == css.Initial || val == css.Default ||
+ len(split) == 0 || !css.IsIdent(split) {
+ unquote = false
+ break
+ }
+ }
+ }
+ if unquote {
+ value.Data = s
+ }
+ }
+ } else if prop == css.Outline || prop == css.Border || prop == css.Border_Bottom || prop == css.Border_Left || prop == css.Border_Right || prop == css.Border_Top {
+ if css.ToHash(value.Data) == css.None {
+ value.TokenType = css.NumberToken
+ value.Data = zeroBytes
+ }
+ }
+ values[i].TokenType, values[i].Data = value.TokenType, value.Data
+ }
+
+ important := false
+ if len(values) > 2 && values[len(values)-2].TokenType == css.DelimToken && values[len(values)-2].Data[0] == '!' && css.ToHash(values[len(values)-1].Data) == css.Important {
+ values = values[:len(values)-2]
+ important = true
+ }
+
+ if len(values) == 1 {
+ if prop == css.Background && css.ToHash(values[0].Data) == css.None {
+ values[0].Data = backgroundNoneBytes
+ } else if bytes.Equal(property, msfilterBytes) {
+ 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):]...)
+ }
+ }
+ } else {
+ if prop == css.Margin || prop == css.Padding || prop == css.Border_Width {
+ if (values[0].TokenType == css.NumberToken || values[0].TokenType == css.DimensionToken || values[0].TokenType == css.PercentageToken) && (len(values)+1)%2 == 0 {
+ valid := true
+ for i := 1; i < len(values); i += 2 {
+ if values[i].TokenType != css.WhitespaceToken || values[i+1].TokenType != css.NumberToken && values[i+1].TokenType != css.DimensionToken && values[i+1].TokenType != css.PercentageToken {
+ valid = false
+ break
+ }
+ }
+ if valid {
+ n := (len(values) + 1) / 2
+ if n == 2 {
+ if bytes.Equal(values[0].Data, values[2].Data) {
+ values = values[:1]
+ }
+ } else if n == 3 {
+ if bytes.Equal(values[0].Data, values[2].Data) && bytes.Equal(values[0].Data, values[4].Data) {
+ values = values[:1]
+ } else if bytes.Equal(values[0].Data, values[4].Data) {
+ values = values[:3]
+ }
+ } else if n == 4 {
+ if bytes.Equal(values[0].Data, values[2].Data) && bytes.Equal(values[0].Data, values[4].Data) && bytes.Equal(values[0].Data, values[6].Data) {
+ values = values[:1]
+ } else if bytes.Equal(values[0].Data, values[4].Data) && bytes.Equal(values[2].Data, values[6].Data) {
+ values = values[:3]
+ } else if bytes.Equal(values[2].Data, values[6].Data) {
+ values = values[:5]
+ }
+ }
+ }
+ }
+ } else if prop == css.Filter && len(values) == 11 {
+ if bytes.Equal(values[0].Data, []byte("progid")) &&
+ values[1].TokenType == css.ColonToken &&
+ bytes.Equal(values[2].Data, []byte("DXImageTransform")) &&
+ values[3].Data[0] == '.' &&
+ bytes.Equal(values[4].Data, []byte("Microsoft")) &&
+ values[5].Data[0] == '.' &&
+ bytes.Equal(values[6].Data, []byte("Alpha(")) &&
+ bytes.Equal(parse.ToLower(values[7].Data), []byte("opacity")) &&
+ values[8].Data[0] == '=' &&
+ values[10].Data[0] == ')' {
+ values = values[6:]
+ values[0].Data = []byte("alpha(")
+ }
+ }
+ }
+
+ for i := 0; i < len(values); i++ {
+ if values[i].TokenType == css.FunctionToken {
+ n, err := c.minifyFunction(values[i:])
+ if err != nil {
+ return err
+ }
+ i += n - 1
+ } else if _, err := c.w.Write(values[i].Data); err != nil {
+ return err
+ }
+ }
+ if important {
+ if _, err := c.w.Write([]byte("!important")); err != nil {
+ return err
+ }
+ }
+ return nil
+}
+
+func (c *cssMinifier) minifyFunction(values []css.Token) (int, error) {
+ n := 1
+ simple := true
+ for i, value := range values[1:] {
+ if value.TokenType == css.RightParenthesisToken {
+ n++
+ break
+ }
+ if i%2 == 0 && (value.TokenType != css.NumberToken && value.TokenType != css.PercentageToken) || (i%2 == 1 && value.TokenType != css.CommaToken) {
+ simple = false
+ }
+ n++
+ }
+ values = values[:n]
+ if simple && (n-1)%2 == 0 {
+ fun := css.ToHash(values[0].Data[:len(values[0].Data)-1])
+ nArgs := (n - 1) / 2
+ if (fun == css.Rgba || fun == css.Hsla) && nArgs == 4 {
+ d, _ := strconv.ParseFloat(string(values[7].Data), 32) // can never fail because if simple == true than this is a NumberToken or PercentageToken
+ if d-1.0 > -minify.Epsilon {
+ if fun == css.Rgba {
+ values[0].Data = []byte("rgb(")
+ fun = css.Rgb
+ } else {
+ values[0].Data = []byte("hsl(")
+ fun = css.Hsl
+ }
+ values = values[:len(values)-2]
+ values[len(values)-1].Data = []byte(")")
+ nArgs = 3
+ } else if d < minify.Epsilon {
+ values[0].Data = []byte("transparent")
+ values = values[:1]
+ fun = 0
+ nArgs = 0
+ }
+ }
+ if fun == css.Rgb && nArgs == 3 {
+ var err [3]error
+ rgb := [3]byte{}
+ for j := 0; j < 3; j++ {
+ val := values[j*2+1]
+ if val.TokenType == css.NumberToken {
+ var d int64
+ d, err[j] = 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 {
+ var d float64
+ d, err[j] = 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)
+ }
+ }
+ if err[0] == nil && err[1] == nil && err[2] == nil {
+ val := make([]byte, 7)
+ val[0] = '#'
+ hex.Encode(val[1:], rgb[:])
+ parse.ToLower(val)
+ if s, ok := ShortenColorHex[string(val)]; ok {
+ if _, err := c.w.Write(s); err != nil {
+ return 0, err
+ }
+ } else {
+ if len(val) == 7 && val[1] == val[2] && val[3] == val[4] && val[5] == val[6] {
+ val[2] = val[3]
+ val[3] = val[5]
+ val = val[:4]
+ }
+ if _, err := c.w.Write(val); err != nil {
+ return 0, err
+ }
+ }
+ return n, nil
+ }
+ } else if fun == css.Hsl && nArgs == 3 {
+ if values[1].TokenType == css.NumberToken && values[3].TokenType == css.PercentageToken && values[5].TokenType == css.PercentageToken {
+ h, err1 := strconv.ParseFloat(string(values[1].Data), 32)
+ s, err2 := strconv.ParseFloat(string(values[3].Data[:len(values[3].Data)-1]), 32)
+ l, err3 := strconv.ParseFloat(string(values[5].Data[:len(values[5].Data)-1]), 32)
+ if err1 == nil && err2 == nil && err3 == nil {
+ r, g, b := css.HSL2RGB(h/360.0, s/100.0, l/100.0)
+ rgb := []byte{byte((r * 255.0) + 0.5), byte((g * 255.0) + 0.5), byte((b * 255.0) + 0.5)}
+ val := make([]byte, 7)
+ val[0] = '#'
+ hex.Encode(val[1:], rgb[:])
+ parse.ToLower(val)
+ if s, ok := ShortenColorHex[string(val)]; ok {
+ if _, err := c.w.Write(s); err != nil {
+ return 0, err
+ }
+ } else {
+ if len(val) == 7 && val[1] == val[2] && val[3] == val[4] && val[5] == val[6] {
+ val[2] = val[3]
+ val[3] = val[5]
+ val = val[:4]
+ }
+ if _, err := c.w.Write(val); err != nil {
+ return 0, err
+ }
+ }
+ return n, nil
+ }
+ }
+ }
+ }
+ for _, value := range values {
+ if _, err := c.w.Write(value.Data); err != nil {
+ return 0, err
+ }
+ }
+ return n, nil
+}
+
+func (c *cssMinifier) shortenToken(prop css.Hash, tt css.TokenType, data []byte) (css.TokenType, []byte) {
+ if tt == css.NumberToken || tt == css.PercentageToken || tt == 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)
+ data = minify.Number(data[:n], c.o.Decimals)
+ if tt == css.PercentageToken && (len(data) != 1 || data[0] != '0' || prop == css.Color) {
+ data = append(data, '%')
+ } else if tt == css.DimensionToken && (len(data) != 1 || data[0] != '0' || requiredDimension[string(dim)]) {
+ data = append(data, dim...)
+ }
+ } else if tt == css.IdentToken {
+ //parse.ToLower(data) // TODO: not all identifiers are case-insensitive; all <custom-ident> properties are case-sensitive
+ if hex, ok := ShortenColorName[css.ToHash(data)]; ok {
+ tt = css.HashToken
+ data = hex
+ }
+ } else if tt == css.HashToken {
+ parse.ToLower(data)
+ 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 tt == css.StringToken {
+ // 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
+ }
+ }
+ } else if tt == css.URLToken {
+ parse.ToLower(data[:3])
+ if len(data) > 10 {
+ uri := data[4 : len(data)-1]
+ delim := byte('"')
+ if uri[0] == '\'' || uri[0] == '"' {
+ delim = uri[0]
+ 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
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-19 00:45:25 +0000