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 (p *Parser) parseDeclaration() GrammarType {
p.initBuf()
parse.ToLower(p.data)
if tt, _ := p.popToken(false); tt != ColonToken {
p.err = ErrBadDeclaration
return ErrorGrammar
}
skipWS := true
for {
tt, data := p.popToken(false)
if (tt == SemicolonToken || tt == RightBraceToken) && p.level == 0 || tt == ErrorToken {
p.prevEnd = (tt == RightBraceToken)
return DeclarationGrammar
} else if tt == LeftParenthesisToken || tt == LeftBraceToken || tt == LeftBracketToken || tt == FunctionToken {
p.level++
} else if tt == RightParenthesisToken || tt == RightBraceToken || tt == RightBracketToken {
p.level--
}
if len(data) == 1 && (data[0] == ',' || data[0] == '/' || data[0] == ':' || data[0] == '!' || data[0] == '=') {
skipWS = true
} else if p.prevWS && !skipWS {
p.pushBuf(WhitespaceToken, wsBytes)
} else {
skipWS = false
}
p.pushBuf(tt, data)
}
}
func (l *Lexer) shiftEndTag() []byte {
for {
c := l.r.Peek(0)
if c == '>' {
l.text = l.r.Lexeme()[2:]
l.r.Move(1)
break
} else if c == 0 {
l.text = l.r.Lexeme()[2:]
break
}
l.r.Move(1)
}
end := len(l.text)
for end > 0 {
if c := l.text[end-1]; c == ' ' || c == '\t' || c == '\n' || c == '\r' {
end--
continue
}
break
}
l.text = l.text[:end]
return parse.ToLower(l.r.Shift())
}
func (l *Lexer) shiftAttribute() []byte {
nameStart := l.r.Pos()
var c byte
for { // attribute name state
if c = l.r.Peek(0); c == ' ' || c == '=' || c == '>' || c == '/' && l.r.Peek(1) == '>' || c == '\t' || c == '\n' || c == '\r' || c == '\f' || c == 0 {
break
}
l.r.Move(1)
}
nameEnd := l.r.Pos()
for { // after attribute name state
if c = l.r.Peek(0); c == ' ' || c == '\t' || c == '\n' || c == '\r' || c == '\f' {
l.r.Move(1)
continue
}
break
}
if c == '=' {
l.r.Move(1)
for { // before attribute value state
if c = l.r.Peek(0); c == ' ' || c == '\t' || c == '\n' || c == '\r' || c == '\f' {
l.r.Move(1)
continue
}
break
}
attrPos := l.r.Pos()
delim := c
if delim == '"' || delim == '\'' { // attribute value single- and double-quoted state
l.r.Move(1)
for {
c := l.r.Peek(0)
if c == delim {
l.r.Move(1)
break
} else if c == 0 {
break
}
l.r.Move(1)
}
} else { // attribute value unquoted state
for {
if c := l.r.Peek(0); c == ' ' || c == '>' || c == '\t' || c == '\n' || c == '\r' || c == '\f' || c == 0 {
break
}
l.r.Move(1)
}
}
l.attrVal = l.r.Lexeme()[attrPos:]
} else {
l.r.Rewind(nameEnd)
l.attrVal = nil
}
l.text = parse.ToLower(l.r.Lexeme()[nameStart:nameEnd])
return l.r.Shift()
}
// ContentType minifies a given mediatype by removing all whitespace.
func ContentType(b []byte) []byte {
j := 0
start := 0
inString := false
for i, c := range b {
if !inString && parse.IsWhitespace(c) {
if start != 0 {
j += copy(b[j:], b[start:i])
} else {
j += i
}
start = i + 1
} else if c == '"' {
inString = !inString
}
}
if start != 0 {
j += copy(b[j:], b[start:])
return parse.ToLower(b[:j])
}
return parse.ToLower(b)
}
func (l *Lexer) shiftStartTag() []byte {
for {
if c := l.r.Peek(0); c == ' ' || c == '>' || c == '/' && l.r.Peek(1) == '>' || c == '\t' || c == '\n' || c == '\r' || c == '\f' || c == 0 {
break
}
l.r.Move(1)
}
l.text = parse.ToLower(l.r.Lexeme()[1:])
if h := ToHash(l.text); h == Textarea || h == Title || h == Style || h == Xmp || h == Iframe || h == Script || h == Plaintext || h == Svg || h == Math {
l.rawTag = h
}
return l.r.Shift()
}
func (p *Parser) parseAtRule() GrammarType {
p.initBuf()
parse.ToLower(p.data)
atRuleName := p.data
if len(atRuleName) > 0 && atRuleName[1] == '-' {
if i := bytes.IndexByte(atRuleName[2:], '-'); i != -1 {
atRuleName = atRuleName[i+2:] // skip vendor specific prefix
}
}
atRule := ToHash(atRuleName[1:])
first := true
skipWS := false
for {
tt, data := p.popToken(false)
if tt == LeftBraceToken && p.level == 0 {
if atRule == Font_Face || atRule == Page {
p.state = append(p.state, p.parseAtRuleDeclarationList)
} else if atRule == Document || atRule == Keyframes || atRule == Media || atRule == Supports {
p.state = append(p.state, p.parseAtRuleRuleList)
} else {
p.state = append(p.state, p.parseAtRuleUnknown)
}
return BeginAtRuleGrammar
} else if (tt == SemicolonToken || tt == RightBraceToken) && p.level == 0 || tt == ErrorToken {
p.prevEnd = (tt == RightBraceToken)
return AtRuleGrammar
} else if tt == LeftParenthesisToken || tt == LeftBraceToken || tt == LeftBracketToken || tt == FunctionToken {
p.level++
} else if tt == RightParenthesisToken || tt == RightBraceToken || tt == RightBracketToken {
p.level--
}
if first {
if tt == LeftParenthesisToken || tt == LeftBracketToken {
p.prevWS = false
}
first = false
}
if len(data) == 1 && (data[0] == ',' || data[0] == ':') {
skipWS = true
} else if p.prevWS && !skipWS && tt != RightParenthesisToken {
p.pushBuf(WhitespaceToken, wsBytes)
} else {
skipWS = false
}
if tt == LeftParenthesisToken {
skipWS = true
}
p.pushBuf(tt, data)
}
}
func (o *Minifier) shortenDimension(b []byte) ([]byte, int) {
if n, m := parse.Dimension(b); n > 0 {
unit := b[n : n+m]
b = minify.Number(b[:n], o.Decimals)
if len(b) != 1 || b[0] != '0' {
if m == 2 && unit[0] == 'p' && unit[1] == 'x' {
unit = nil
} else if m > 1 { // only percentage is length 1
parse.ToLower(unit)
}
b = append(b, unit...)
}
return b, n + m
}
return b, 0
}
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:]
data = minify.Number(data[:n], c.o.Decimals)
if len(data) != 1 || data[0] != '0' {
if tt == css.PercentageToken {
data = append(data, '%')
} else if tt == css.DimensionToken {
parse.ToLower(dim)
data = append(data, dim...)
}
}
} else if tt == css.IdentToken {
parse.ToLower(data)
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
}
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) 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
}
// Minify minifies SVG data, it reads from r and writes to w.
func (o *Minifier) Minify(m *minify.M, w io.Writer, r io.Reader, _ map[string]string) error {
var tag svg.Hash
defaultStyleType := cssMimeBytes
defaultStyleParams := map[string]string(nil)
defaultInlineStyleParams := map[string]string{"inline": "1"}
p := NewPathData(o)
minifyBuffer := buffer.NewWriter(make([]byte, 0, 64))
attrByteBuffer := make([]byte, 0, 64)
gStack := make([]bool, 0)
l := xml.NewLexer(r)
tb := NewTokenBuffer(l)
for {
t := *tb.Shift()
SWITCH:
switch t.TokenType {
case xml.ErrorToken:
if l.Err() == io.EOF {
return nil
}
return l.Err()
case xml.DOCTYPEToken:
if len(t.Text) > 0 && t.Text[len(t.Text)-1] == ']' {
if _, err := w.Write(t.Data); err != nil {
return err
}
}
case xml.TextToken:
t.Data = parse.ReplaceMultipleWhitespace(parse.TrimWhitespace(t.Data))
if tag == svg.Style && len(t.Data) > 0 {
if err := m.MinifyMimetype(defaultStyleType, w, buffer.NewReader(t.Data), defaultStyleParams); err != nil {
if err != minify.ErrNotExist {
return err
} else if _, err := w.Write(t.Data); err != nil {
return err
}
}
} else if _, err := w.Write(t.Data); err != nil {
return err
}
case xml.CDATAToken:
if tag == svg.Style {
minifyBuffer.Reset()
if err := m.MinifyMimetype(defaultStyleType, minifyBuffer, buffer.NewReader(t.Text), defaultStyleParams); err == nil {
t.Data = append(t.Data[:9], minifyBuffer.Bytes()...)
t.Text = t.Data[9:]
t.Data = append(t.Data, cdataEndBytes...)
} else if err != minify.ErrNotExist {
return err
}
}
var useText bool
if t.Text, useText = xml.EscapeCDATAVal(&attrByteBuffer, t.Text); useText {
t.Text = parse.ReplaceMultipleWhitespace(parse.TrimWhitespace(t.Text))
if _, err := w.Write(t.Text); err != nil {
return err
}
} else if _, err := w.Write(t.Data); err != nil {
return err
}
case xml.StartTagPIToken:
for {
if t := *tb.Shift(); t.TokenType == xml.StartTagClosePIToken || t.TokenType == xml.ErrorToken {
break
}
}
case xml.StartTagToken:
tag = t.Hash
if containerTagMap[tag] { // skip empty containers
i := 0
for {
next := tb.Peek(i)
i++
if next.TokenType == xml.EndTagToken && next.Hash == tag || next.TokenType == xml.StartTagCloseVoidToken || next.TokenType == xml.ErrorToken {
for j := 0; j < i; j++ {
tb.Shift()
}
break SWITCH
} else if next.TokenType != xml.AttributeToken && next.TokenType != xml.StartTagCloseToken {
break
}
}
if tag == svg.G {
if tb.Peek(0).TokenType == xml.StartTagCloseToken {
gStack = append(gStack, false)
tb.Shift()
break
}
gStack = append(gStack, true)
}
} else if tag == svg.Metadata {
skipTag(tb, tag)
break
} else if tag == svg.Line {
o.shortenLine(tb, &t, p)
} else if tag == svg.Rect && !o.shortenRect(tb, &t, p) {
skipTag(tb, tag)
break
} else if tag == svg.Polygon || tag == svg.Polyline {
o.shortenPoly(tb, &t, p)
}
if _, err := w.Write(t.Data); err != nil {
return err
}
case xml.AttributeToken:
if len(t.AttrVal) == 0 || t.Text == nil { // data is nil when attribute has been removed
continue
}
attr := t.Hash
val := t.AttrVal
if n, m := parse.Dimension(val); n+m == len(val) { // TODO: inefficient, temporary measure
val, _ = o.shortenDimension(val)
}
if attr == svg.Xml_Space && parse.Equal(val, []byte("preserve")) ||
tag == svg.Svg && (attr == svg.Version && parse.Equal(val, []byte("1.1")) ||
attr == svg.X && parse.Equal(val, []byte("0")) ||
attr == svg.Y && parse.Equal(val, []byte("0")) ||
attr == svg.Width && parse.Equal(val, []byte("100%")) ||
attr == svg.Height && parse.Equal(val, []byte("100%")) ||
attr == svg.PreserveAspectRatio && parse.Equal(val, []byte("xMidYMid meet")) ||
attr == svg.BaseProfile && parse.Equal(val, []byte("none")) ||
attr == svg.ContentScriptType && parse.Equal(val, []byte("application/ecmascript")) ||
attr == svg.ContentStyleType && parse.Equal(val, []byte("text/css"))) ||
tag == svg.Style && attr == svg.Type && parse.Equal(val, []byte("text/css")) {
continue
}
if _, err := w.Write(spaceBytes); err != nil {
return err
}
if _, err := w.Write(t.Text); err != nil {
return err
}
if _, err := w.Write(isBytes); err != nil {
return err
}
if tag == svg.Svg && attr == svg.ContentStyleType {
val = minify.ContentType(val)
defaultStyleType = val
} else if attr == svg.Style {
minifyBuffer.Reset()
if err := m.MinifyMimetype(defaultStyleType, minifyBuffer, buffer.NewReader(val), defaultInlineStyleParams); err == nil {
val = minifyBuffer.Bytes()
} else if err != minify.ErrNotExist {
return err
}
} else if attr == svg.D {
val = p.ShortenPathData(val)
} else if attr == svg.ViewBox {
j := 0
newVal := val[:0]
for i := 0; i < 4; i++ {
if i != 0 {
if j >= len(val) || val[j] != ' ' && val[j] != ',' {
newVal = append(newVal, val[j:]...)
break
}
newVal = append(newVal, ' ')
j++
}
if dim, n := o.shortenDimension(val[j:]); n > 0 {
newVal = append(newVal, dim...)
j += n
} else {
newVal = append(newVal, val[j:]...)
break
}
}
val = newVal
} else if colorAttrMap[attr] && len(val) > 0 {
parse.ToLower(val)
if val[0] == '#' {
if name, ok := minifyCSS.ShortenColorHex[string(val)]; ok {
val = name
} 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]
}
} else if hex, ok := minifyCSS.ShortenColorName[css.ToHash(val)]; ok {
val = hex
} else if len(val) > 5 && parse.Equal(val[:4], []byte("rgb(")) && val[len(val)-1] == ')' {
// TODO: handle rgb(x, y, z) and hsl(x, y, z)
}
}
// prefer single or double quotes depending on what occurs more often in value
val = xml.EscapeAttrVal(&attrByteBuffer, val)
if _, err := w.Write(val); err != nil {
return err
}
case xml.StartTagCloseToken:
next := tb.Peek(0)
skipExtra := false
if next.TokenType == xml.TextToken && parse.IsAllWhitespace(next.Data) {
next = tb.Peek(1)
skipExtra = true
}
if next.TokenType == xml.EndTagToken {
// collapse empty tags to single void tag
tb.Shift()
if skipExtra {
tb.Shift()
}
if _, err := w.Write(voidBytes); err != nil {
return err
}
} else {
if _, err := w.Write(t.Data); err != nil {
return err
}
}
case xml.StartTagCloseVoidToken:
tag = 0
if _, err := w.Write(t.Data); err != nil {
return err
}
case xml.EndTagToken:
tag = 0
if t.Hash == svg.G && len(gStack) > 0 {
if !gStack[len(gStack)-1] {
gStack = gStack[:len(gStack)-1]
break
}
gStack = gStack[:len(gStack)-1]
}
if len(t.Data) > 3+len(t.Text) {
t.Data[2+len(t.Text)] = '>'
t.Data = t.Data[:3+len(t.Text)]
}
if _, err := w.Write(t.Data); err != nil {
return err
}
}
}
}
// Minify minifies HTML data, it reads from r and writes to w.
func (o *Minifier) Minify(m *minify.M, w io.Writer, r io.Reader, _ map[string]string) error {
var rawTagHash html.Hash
var rawTagTraits traits
var rawTagMediatype []byte
omitSpace := true // if true the next leading space is omitted
defaultScriptType := jsMimeBytes
defaultScriptParams := map[string]string(nil)
defaultStyleType := cssMimeBytes
defaultStyleParams := map[string]string(nil)
defaultInlineStyleParams := map[string]string{"inline": "1"}
attrMinifyBuffer := buffer.NewWriter(make([]byte, 0, 64))
attrByteBuffer := make([]byte, 0, 64)
attrTokenBuffer := make([]*Token, 0, maxAttrLookup)
l := html.NewLexer(r)
tb := NewTokenBuffer(l)
for {
t := *tb.Shift()
SWITCH:
switch t.TokenType {
case html.ErrorToken:
if l.Err() == io.EOF {
return nil
}
return l.Err()
case html.DoctypeToken:
if _, err := w.Write([]byte("<!doctype html>")); err != nil {
return err
}
case html.CommentToken:
// TODO: ensure that nested comments are handled properly (lexer doesn't handle this!)
var comment []byte
if bytes.HasPrefix(t.Data, []byte("[if")) {
comment = append(append([]byte("<!--"), t.Data...), []byte("-->")...)
} else if bytes.HasSuffix(t.Data, []byte("--")) {
// only occurs when mixed up with conditional comments
comment = append(append([]byte("<!"), t.Data...), '>')
}
if _, err := w.Write(comment); err != nil {
return err
}
case html.TextToken:
// CSS and JS minifiers for inline code
if rawTagHash != 0 {
if rawTagHash == html.Style || rawTagHash == html.Script || rawTagHash == html.Iframe || rawTagHash == html.Svg || rawTagHash == html.Math {
var mimetype []byte
var params map[string]string
if rawTagHash == html.Iframe {
mimetype = htmlMimeBytes
} else if rawTagHash == html.Svg {
mimetype = svgMimeBytes
} else if rawTagHash == html.Math {
mimetype = mathMimeBytes
} else if len(rawTagMediatype) > 0 {
mimetype, params = parse.Mediatype(rawTagMediatype)
} else if rawTagHash == html.Script {
mimetype = defaultScriptType
params = defaultScriptParams
} else if rawTagHash == html.Style {
mimetype = defaultStyleType
params = defaultStyleParams
}
// TODO: really necessary?
// ignore CDATA because that only has meaning in XML
if trimmedData := parse.TrimWhitespace(t.Data); len(trimmedData) > 12 && bytes.Equal(trimmedData[:9], cdataBytes) && bytes.Equal(trimmedData[len(trimmedData)-3:], cdataEndBytes) {
t.Data = trimmedData[9 : len(trimmedData)-3]
}
if err := m.MinifyMimetype(mimetype, w, buffer.NewReader(t.Data), params); err != nil {
if _, err := w.Write(t.Data); err != nil {
return err
}
}
} else if _, err := w.Write(t.Data); err != nil {
return err
}
if rawTagTraits&nonPhrasingTag == 0 && rawTagHash != html.Script {
omitSpace = len(t.Data) > 0 && t.Data[len(t.Data)-1] == ' '
}
} else {
t.Data = parse.ReplaceMultipleWhitespace(t.Data)
if !o.KeepWhitespace {
// whitespace removal; trim left
if omitSpace && t.Data[0] == ' ' {
t.Data = t.Data[1:]
}
// whitespace removal; trim right
omitSpace = false
if len(t.Data) == 0 {
omitSpace = true
} else if t.Data[len(t.Data)-1] == ' ' {
omitSpace = true
i := 0
for {
next := tb.Peek(i)
// trim if EOF, text token with leading whitespace or block token
if next.TokenType == html.ErrorToken {
t.Data = t.Data[:len(t.Data)-1]
omitSpace = false
break
} else if next.TokenType == html.TextToken {
// remove if the text token starts with a whitespace
if len(next.Data) > 0 && parse.IsWhitespace(next.Data[0]) {
t.Data = t.Data[:len(t.Data)-1]
omitSpace = false
}
break
} else if next.TokenType == html.StartTagToken || next.TokenType == html.EndTagToken {
// remove when followed up by a block tag
if next.Traits&nonPhrasingTag != 0 {
t.Data = t.Data[:len(t.Data)-1]
omitSpace = false
break
} else if next.TokenType == html.StartTagToken {
break
}
}
i++
}
}
}
if _, err := w.Write(t.Data); err != nil {
return err
}
}
case html.StartTagToken, html.EndTagToken:
rawTagHash = 0
hasAttributes := false
if t.TokenType == html.StartTagToken {
if next := tb.Peek(0); next.TokenType == html.AttributeToken {
hasAttributes = true
}
if t.Traits&rawTag != 0 {
// ignore empty script and style tags
if !hasAttributes && (t.Hash == html.Script || t.Hash == html.Style) {
if next := tb.Peek(1); next.TokenType == html.EndTagToken {
tb.Shift()
tb.Shift()
break
}
}
rawTagHash = t.Hash
rawTagTraits = t.Traits
rawTagMediatype = nil
}
}
if t.Traits&nonPhrasingTag != 0 {
omitSpace = true // omit spaces after block elements
}
// remove superfluous ending tags
if !hasAttributes && (t.Hash == html.Html || t.Hash == html.Head || t.Hash == html.Body || t.Hash == html.Colgroup) {
break
} else if t.TokenType == html.EndTagToken {
if t.Hash == html.Thead || t.Hash == html.Tbody || t.Hash == html.Tfoot || t.Hash == html.Tr || t.Hash == html.Th || t.Hash == html.Td ||
t.Hash == html.Optgroup || t.Hash == html.Option || t.Hash == html.Dd || t.Hash == html.Dt ||
t.Hash == html.Li || t.Hash == html.Rb || t.Hash == html.Rt || t.Hash == html.Rtc || t.Hash == html.Rp {
break
} else if t.Hash == html.P {
i := 0
for {
next := tb.Peek(i)
i++
// continue if text token is empty or whitespace
if next.TokenType == html.TextToken && parse.IsAllWhitespace(next.Data) {
continue
}
if next.TokenType == html.ErrorToken || next.TokenType == html.EndTagToken && next.Hash != html.A || next.TokenType == html.StartTagToken && next.Traits&nonPhrasingTag != 0 {
break SWITCH
}
break
}
}
}
// write tag
if t.TokenType == html.EndTagToken {
if _, err := w.Write(endBytes); err != nil {
return err
}
} else {
if _, err := w.Write(ltBytes); err != nil {
return err
}
}
if _, err := w.Write(t.Data); err != nil {
return err
}
if hasAttributes {
// rewrite attributes with interdependent conditions
if t.Hash == html.A {
getAttributes(&attrTokenBuffer, tb, html.Id, html.Name, html.Rel, html.Href)
if id := attrTokenBuffer[0]; id != nil {
if name := attrTokenBuffer[1]; name != nil && parse.Equal(id.AttrVal, name.AttrVal) {
name.Data = nil
}
}
if href := attrTokenBuffer[3]; href != nil {
if len(href.AttrVal) > 5 && parse.EqualFold(href.AttrVal[:4], httpBytes) {
if href.AttrVal[4] == ':' {
if m.URL != nil && m.URL.Scheme == "http" {
href.AttrVal = href.AttrVal[5:]
} else {
parse.ToLower(href.AttrVal[:4])
}
} else if (href.AttrVal[4] == 's' || href.AttrVal[4] == 'S') && href.AttrVal[5] == ':' {
if m.URL != nil && m.URL.Scheme == "https" {
href.AttrVal = href.AttrVal[6:]
} else {
parse.ToLower(href.AttrVal[:5])
}
}
}
}
} else if t.Hash == html.Meta {
getAttributes(&attrTokenBuffer, tb, html.Content, html.Http_Equiv, html.Charset, html.Name)
if content := attrTokenBuffer[0]; content != nil {
if httpEquiv := attrTokenBuffer[1]; httpEquiv != nil {
content.AttrVal = minify.ContentType(content.AttrVal)
if charset := attrTokenBuffer[2]; charset == nil && parse.EqualFold(httpEquiv.AttrVal, []byte("content-type")) && parse.Equal(content.AttrVal, []byte("text/html;charset=utf-8")) {
httpEquiv.Data = nil
content.Data = []byte("charset")
content.Hash = html.Charset
content.AttrVal = []byte("utf-8")
} else if parse.EqualFold(httpEquiv.AttrVal, []byte("content-style-type")) {
defaultStyleType, defaultStyleParams = parse.Mediatype(content.AttrVal)
if defaultStyleParams != nil {
defaultInlineStyleParams = defaultStyleParams
defaultInlineStyleParams["inline"] = "1"
} else {
defaultInlineStyleParams = map[string]string{"inline": "1"}
}
} else if parse.EqualFold(httpEquiv.AttrVal, []byte("content-script-type")) {
defaultScriptType, defaultScriptParams = parse.Mediatype(content.AttrVal)
}
}
if name := attrTokenBuffer[3]; name != nil {
if parse.EqualFold(name.AttrVal, []byte("keywords")) {
content.AttrVal = bytes.Replace(content.AttrVal, []byte(", "), []byte(","), -1)
} else if parse.EqualFold(name.AttrVal, []byte("viewport")) {
content.AttrVal = bytes.Replace(content.AttrVal, []byte(" "), []byte(""), -1)
}
}
}
} else if t.Hash == html.Script {
getAttributes(&attrTokenBuffer, tb, html.Src, html.Charset)
if src := attrTokenBuffer[0]; src != nil {
if charset := attrTokenBuffer[1]; charset != nil {
charset.Data = nil
}
}
}
// write attributes
for {
attr := *tb.Shift()
if attr.TokenType != html.AttributeToken {
break
} else if attr.Data == nil {
continue // removed attribute
}
val := attr.AttrVal
if len(val) > 1 && (val[0] == '"' || val[0] == '\'') {
val = parse.TrimWhitespace(val[1 : len(val)-1])
}
if len(val) == 0 && (attr.Hash == html.Class ||
attr.Hash == html.Dir ||
attr.Hash == html.Id ||
attr.Hash == html.Lang ||
attr.Hash == html.Name ||
attr.Hash == html.Title ||
attr.Hash == html.Action && t.Hash == html.Form ||
attr.Hash == html.Value && t.Hash == html.Input) {
continue // omit empty attribute values
}
if attr.Traits&caselessAttr != 0 {
val = parse.ToLower(val)
if attr.Hash == html.Enctype || attr.Hash == html.Codetype || attr.Hash == html.Accept || attr.Hash == html.Type && (t.Hash == html.A || t.Hash == html.Link || t.Hash == html.Object || t.Hash == html.Param || t.Hash == html.Script || t.Hash == html.Style || t.Hash == html.Source) {
val = minify.ContentType(val)
}
}
if rawTagHash != 0 && attr.Hash == html.Type {
rawTagMediatype = val
}
// default attribute values can be ommited
if !o.KeepDefaultAttrVals && (attr.Hash == html.Type && (t.Hash == html.Script && parse.Equal(val, []byte("text/javascript")) ||
t.Hash == html.Style && parse.Equal(val, []byte("text/css")) ||
t.Hash == html.Link && parse.Equal(val, []byte("text/css")) ||
t.Hash == html.Input && parse.Equal(val, []byte("text")) ||
t.Hash == html.Button && parse.Equal(val, []byte("submit"))) ||
attr.Hash == html.Language && t.Hash == html.Script ||
attr.Hash == html.Method && parse.Equal(val, []byte("get")) ||
attr.Hash == html.Enctype && parse.Equal(val, []byte("application/x-www-form-urlencoded")) ||
attr.Hash == html.Colspan && parse.Equal(val, []byte("1")) ||
attr.Hash == html.Rowspan && parse.Equal(val, []byte("1")) ||
attr.Hash == html.Shape && parse.Equal(val, []byte("rect")) ||
attr.Hash == html.Span && parse.Equal(val, []byte("1")) ||
attr.Hash == html.Clear && parse.Equal(val, []byte("none")) ||
attr.Hash == html.Frameborder && parse.Equal(val, []byte("1")) ||
attr.Hash == html.Scrolling && parse.Equal(val, []byte("auto")) ||
attr.Hash == html.Valuetype && parse.Equal(val, []byte("data")) ||
attr.Hash == html.Media && t.Hash == html.Style && parse.Equal(val, []byte("all"))) {
continue
}
// CSS and JS minifiers for attribute inline code
if attr.Hash == html.Style {
attrMinifyBuffer.Reset()
if m.MinifyMimetype(defaultStyleType, attrMinifyBuffer, buffer.NewReader(val), defaultInlineStyleParams) == nil {
val = attrMinifyBuffer.Bytes()
}
if len(val) == 0 {
continue
}
} else if len(attr.Data) > 2 && attr.Data[0] == 'o' && attr.Data[1] == 'n' {
if len(val) >= 11 && parse.EqualFold(val[:11], jsSchemeBytes) {
val = val[11:]
}
attrMinifyBuffer.Reset()
if m.MinifyMimetype(defaultScriptType, attrMinifyBuffer, buffer.NewReader(val), defaultScriptParams) == nil {
val = attrMinifyBuffer.Bytes()
}
if len(val) == 0 {
continue
}
} else if len(val) > 5 && attr.Traits&urlAttr != 0 { // anchors are already handled
if t.Hash != html.A {
if parse.EqualFold(val[:4], httpBytes) {
if val[4] == ':' {
if m.URL != nil && m.URL.Scheme == "http" {
val = val[5:]
} else {
parse.ToLower(val[:4])
}
} else if (val[4] == 's' || val[4] == 'S') && val[5] == ':' {
if m.URL != nil && m.URL.Scheme == "https" {
val = val[6:]
} else {
parse.ToLower(val[:5])
}
}
}
}
if parse.EqualFold(val[:5], dataSchemeBytes) {
val = minify.DataURI(m, val)
}
}
if _, err := w.Write(spaceBytes); err != nil {
return err
}
if _, err := w.Write(attr.Data); err != nil {
return err
}
if len(val) > 0 && attr.Traits&booleanAttr == 0 {
if _, err := w.Write(isBytes); err != nil {
return err
}
// no quotes if possible, else prefer single or double depending on which occurs more often in value
val = html.EscapeAttrVal(&attrByteBuffer, attr.AttrVal, val)
if _, err := w.Write(val); err != nil {
return err
}
}
}
}
if _, err := w.Write(gtBytes); err != nil {
return err
}
}
}
}
// Minify minifies SVG data, it reads from r and writes to w.
func Minify(m minify.Minifier, _ string, w io.Writer, r io.Reader) error {
var tag svg.Hash
attrMinifyBuffer := buffer.NewWriter(make([]byte, 0, 64))
attrByteBuffer := make([]byte, 0, 64)
l := xml.NewLexer(r)
tb := xml.NewTokenBuffer(l)
for {
t := *tb.Shift()
if t.TokenType == xml.CDATAToken {
var useCDATA bool
if t.Data, useCDATA = xml.EscapeCDATAVal(&attrByteBuffer, t.Data); !useCDATA {
t.TokenType = xml.TextToken
}
}
SWITCH:
switch t.TokenType {
case xml.ErrorToken:
if l.Err() == io.EOF {
return nil
}
return l.Err()
case xml.TextToken:
t.Data = parse.ReplaceMultiple(parse.Trim(t.Data, parse.IsWhitespace), parse.IsWhitespace, ' ')
if tag == svg.Style && len(t.Data) > 0 {
if err := m.Minify("text/css", w, buffer.NewReader(t.Data)); err != nil {
if err == minify.ErrNotExist { // no minifier, write the original
if _, err := w.Write(t.Data); err != nil {
return err
}
} else {
return err
}
}
} else if _, err := w.Write(t.Data); err != nil {
return err
}
case xml.CDATAToken:
if _, err := w.Write(cdataStartBytes); err != nil {
return err
}
t.Data = parse.ReplaceMultiple(parse.Trim(t.Data, parse.IsWhitespace), parse.IsWhitespace, ' ')
if tag == svg.Style && len(t.Data) > 0 {
if err := m.Minify("text/css", w, buffer.NewReader(t.Data)); err != nil {
if err == minify.ErrNotExist { // no minifier, write the original
if _, err := w.Write(t.Data); err != nil {
return err
}
} else {
return err
}
}
} else if _, err := w.Write(t.Data); err != nil {
return err
}
if _, err := w.Write(cdataEndBytes); err != nil {
return err
}
case xml.StartTagPIToken:
for {
if t := *tb.Shift(); t.TokenType == xml.StartTagClosePIToken || t.TokenType == xml.ErrorToken {
break
}
}
case xml.StartTagToken:
tag = svg.ToHash(t.Data)
if containerTagMap[tag] { // skip empty containers
i := 0
for {
next := tb.Peek(i)
i++
if next.TokenType == xml.EndTagToken && svg.ToHash(next.Data) == tag || next.TokenType == xml.StartTagCloseVoidToken || next.TokenType == xml.ErrorToken {
for j := 0; j < i; j++ {
tb.Shift()
}
break SWITCH
} else if next.TokenType != xml.AttributeToken && next.TokenType != xml.StartTagCloseToken {
break
}
}
} else if tag == svg.Metadata {
for {
if t := *tb.Shift(); t.TokenType == xml.EndTagToken && svg.ToHash(t.Data) == tag || t.TokenType == xml.StartTagCloseVoidToken || t.TokenType == xml.ErrorToken {
break
}
}
break
} else if tag == svg.Line || tag == svg.Rect {
// TODO: shape2path also for polygon and polyline
// x1, y1, x2, y2 float64 := 0, 0, 0, 0
// valid := true
// i := 0
// for {
// next := tb.Peek(i)
// i++
// if next.TokenType != xml.AttributeToken {
// break
// }
// v *int
// attr := svg.ToHash(next.Data)
// if tag == svg.Line {
// if attr == svg.X1 {
// v = &x1
// } else if attr == svg.Y1 {
// v = &y1
// } else if attr == svg.X2 {
// v = &x2
// } else if attr == svg.Y2 {
// v = &Y2
// } else {
// continue
// }
// } else if attr == svg.X { // rect
// v = &x1
// } else if attr == svg.Y {
// v = &y1
// } else if attr == svg.Width {
// v = &x2
// } else if attr == svg.Height {
// v = &Y2
// } else if attr == svg.Rx || attr == svg.Ry {
// valid = false
// break
// } else {
// continue
// }
// }
// if valid {
// t.Data = pathBytes
// }
}
if _, err := w.Write(ltBytes); err != nil {
return err
}
if _, err := w.Write(t.Data); err != nil {
return err
}
case xml.AttributeToken:
if len(t.AttrVal) < 2 {
continue
}
attr := svg.ToHash(t.Data)
val := parse.ReplaceMultiple(parse.Trim(t.AttrVal[1:len(t.AttrVal)-1], parse.IsWhitespace), parse.IsWhitespace, ' ')
if tag == svg.Svg && attr == svg.Version {
continue
}
if _, err := w.Write(spaceBytes); err != nil {
return err
}
if _, err := w.Write(t.Data); err != nil {
return err
}
if _, err := w.Write(isBytes); err != nil {
return err
}
if attr == svg.Style {
attrMinifyBuffer.Reset()
if m.Minify("text/css;inline=1", attrMinifyBuffer, buffer.NewReader(val)) == nil {
val = attrMinifyBuffer.Bytes()
}
} else if attr == svg.D {
val = shortenPathData(val)
} else if attr == svg.ViewBox {
j := 0
newVal := val[:0]
for i := 0; i < 4; i++ {
if i != 0 {
if j >= len(val) || val[j] != ' ' && val[j] != ',' {
newVal = append(newVal, val[j:]...)
break
}
newVal = append(newVal, ' ')
j++
}
if dim, n := shortenDimension(val[j:]); n > 0 {
newVal = append(newVal, dim...)
j += n
} else {
newVal = append(newVal, val[j:]...)
break
}
}
val = newVal
} else if colorAttrMap[attr] && len(val) > 0 {
parse.ToLower(val)
if val[0] == '#' {
if name, ok := minifyCSS.ShortenColorHex[string(val)]; ok {
val = name
} 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]
}
} else if hex, ok := minifyCSS.ShortenColorName[css.ToHash(val)]; ok {
val = hex
} else if len(val) > 5 && parse.Equal(val[:4], []byte("rgb(")) && val[len(val)-1] == ')' {
// TODO: handle rgb(x, y, z) and hsl(x, y, z)
}
} else if dim, n := shortenDimension(val); n == len(val) {
val = dim
}
// prefer single or double quotes depending on what occurs more often in value
val = xml.EscapeAttrVal(&attrByteBuffer, val)
if _, err := w.Write(val); err != nil {
return err
}
case xml.StartTagCloseToken:
next := tb.Peek(0)
skipExtra := false
if next.TokenType == xml.TextToken && parse.IsAllWhitespace(next.Data) {
next = tb.Peek(1)
skipExtra = true
}
if next.TokenType == xml.EndTagToken {
// collapse empty tags to single void tag
tb.Shift()
if skipExtra {
tb.Shift()
}
if _, err := w.Write(voidBytes); err != nil {
return err
}
} else {
if _, err := w.Write(gtBytes); err != nil {
return err
}
}
case xml.StartTagCloseVoidToken:
if _, err := w.Write(voidBytes); err != nil {
return err
}
case xml.EndTagToken:
if _, err := w.Write(endBytes); err != nil {
return err
}
if _, err := w.Write(t.Data); err != nil {
return err
}
if _, err := w.Write(gtBytes); err != nil {
return err
}
}
}
}
// Minify minifies HTML data, it reads from r and writes to w.
func Minify(m minify.Minifier, _ string, w io.Writer, r io.Reader) error {
var rawTag html.Hash
var rawTagMediatype []byte
omitSpace := true // if true the next leading space is omitted
defaultScriptType := "text/javascript"
defaultStyleType := "text/css"
defaultInlineStyleType := "text/css;inline=1"
attrMinifyBuffer := buffer.NewWriter(make([]byte, 0, 64))
attrByteBuffer := make([]byte, 0, 64)
attrIntBuffer := make([]int, 0, maxAttrLookup)
attrTokenBuffer := make([]*html.Token, 0, maxAttrLookup)
l := html.NewLexer(r)
tb := html.NewTokenBuffer(l)
for {
t := *tb.Shift()
SWITCH:
switch t.TokenType {
case html.ErrorToken:
if l.Err() == io.EOF {
return nil
}
return l.Err()
case html.DoctypeToken:
if _, err := w.Write([]byte("<!doctype html>")); err != nil {
return err
}
case html.CommentToken:
// TODO: ensure that nested comments are handled properly (lexer doesn't handle this!)
var comment []byte
if bytes.HasPrefix(t.Data, []byte("[if")) {
comment = append(append([]byte("<!--"), t.Data...), []byte("-->")...)
} else if bytes.HasSuffix(t.Data, []byte("--")) {
// only occurs when mixed up with conditional comments
comment = append(append([]byte("<!"), t.Data...), '>')
}
if _, err := w.Write(comment); err != nil {
return err
}
case html.TextToken:
// CSS and JS minifiers for inline code
if rawTag != 0 {
if rawTag == html.Style || rawTag == html.Script || rawTag == html.Iframe || rawTag == html.Svg || rawTag == html.Math {
var mediatype string
if rawTag == html.Iframe {
mediatype = "text/html"
} else if len(rawTagMediatype) > 0 {
mediatype = string(rawTagMediatype)
} else if rawTag == html.Script {
mediatype = defaultScriptType
} else if rawTag == html.Style {
mediatype = defaultStyleType
} else if rawTag == html.Svg {
mediatype = "image/svg+xml"
} else if rawTag == html.Math {
mediatype = "application/mathml+xml"
}
// ignore CDATA
if trimmedData := parse.Trim(t.Data, parse.IsWhitespace); len(trimmedData) > 12 && bytes.Equal(trimmedData[:9], []byte("<![CDATA[")) && bytes.Equal(trimmedData[len(trimmedData)-3:], []byte("]]>")) {
t.Data = trimmedData[9 : len(trimmedData)-3]
}
if err := m.Minify(mediatype, w, buffer.NewReader(t.Data)); err != nil {
if _, err := w.Write(t.Data); err != nil {
return err
}
}
} else if _, err := w.Write(t.Data); err != nil {
return err
}
if !nonPhrasingTagMap[rawTag] && rawTag != html.Script {
omitSpace = len(t.Data) > 0 && t.Data[len(t.Data)-1] == ' '
}
} else {
t.Data = parse.ReplaceMultiple(t.Data, parse.IsWhitespace, ' ')
// whitespace removal; trim left
if omitSpace && t.Data[0] == ' ' {
t.Data = t.Data[1:]
}
// whitespace removal; trim right
omitSpace = false
if len(t.Data) == 0 {
omitSpace = true
} else if t.Data[len(t.Data)-1] == ' ' {
omitSpace = true
i := 0
for {
next := tb.Peek(i)
// trim if EOF, text token with leading whitespace or block token
if next.TokenType == html.ErrorToken {
t.Data = t.Data[:len(t.Data)-1]
omitSpace = false
break
} else if next.TokenType == html.TextToken {
// remove if the text token starts with a whitespace
if len(next.Data) > 0 && parse.IsWhitespace(next.Data[0]) {
t.Data = t.Data[:len(t.Data)-1]
omitSpace = false
}
break
} else if next.TokenType == html.StartTagToken || next.TokenType == html.EndTagToken {
// remove when followed up by a block tag
if nonPhrasingTagMap[next.Hash] {
t.Data = t.Data[:len(t.Data)-1]
omitSpace = false
break
} else if next.TokenType == html.StartTagToken {
break
}
}
i++
}
}
if _, err := w.Write(t.Data); err != nil {
return err
}
}
case html.StartTagToken, html.EndTagToken:
rawTag = 0
hasAttributes := false
if t.TokenType == html.StartTagToken {
if next := tb.Peek(0); next.TokenType == html.AttributeToken {
hasAttributes = true
}
if rawTagMap[t.Hash] {
// ignore empty script and style tags
if !hasAttributes && (t.Hash == html.Script || t.Hash == html.Style) {
if next := tb.Peek(1); next.TokenType == html.EndTagToken {
tb.Shift()
tb.Shift()
break
}
}
rawTag = t.Hash
rawTagMediatype = []byte{}
}
}
if nonPhrasingTagMap[t.Hash] {
omitSpace = true // omit spaces after block elements
}
// remove superfluous ending tags
if !hasAttributes && (t.Hash == html.Html || t.Hash == html.Head || t.Hash == html.Body || t.Hash == html.Colgroup) {
break
} else if t.TokenType == html.EndTagToken {
if t.Hash == html.Thead || t.Hash == html.Tbody || t.Hash == html.Tfoot || t.Hash == html.Tr || t.Hash == html.Th || t.Hash == html.Td ||
t.Hash == html.Optgroup || t.Hash == html.Option || t.Hash == html.Dd || t.Hash == html.Dt ||
t.Hash == html.Li || t.Hash == html.Rb || t.Hash == html.Rt || t.Hash == html.Rtc || t.Hash == html.Rp {
break
} else if t.Hash == html.P {
i := 0
for {
next := tb.Peek(i)
i++
// continue if text token is empty or whitespace
if next.TokenType == html.TextToken && parse.IsAllWhitespace(next.Data) {
continue
}
if next.TokenType == html.ErrorToken || next.TokenType == html.EndTagToken && next.Hash != html.A || next.TokenType == html.StartTagToken && nonPhrasingTagMap[next.Hash] {
break SWITCH
}
break
}
}
}
// write tag
if t.TokenType == html.EndTagToken {
if _, err := w.Write(endBytes); err != nil {
return err
}
} else {
if _, err := w.Write(ltBytes); err != nil {
return err
}
}
if _, err := w.Write(t.Data); err != nil {
return err
}
if hasAttributes {
// rewrite attributes with interdependent conditions
if t.Hash == html.A {
if attr := getAttributes(tb, &attrIntBuffer, &attrTokenBuffer, html.Id, html.Name, html.Rel, html.Href); attr != nil {
if id := attr[0]; id != nil {
if name := attr[1]; name != nil && parse.Equal(id.AttrVal, name.AttrVal) {
name.Data = nil
}
}
// TODO: omit http or https according to URL, specified through options
// if rel := attr[2]; rel == nil || !parse.EqualFold(rel.AttrVal, externalBytes) {
// if href := attr[3]; href != nil {
// if len(href.AttrVal) > 5 && parse.EqualFold(href.AttrVal[:4], []byte{'h', 't', 't', 'p'}) {
// if href.AttrVal[4] == ':' {
// href.AttrVal = href.AttrVal[5:]
// } else if (href.AttrVal[4] == 's' || href.AttrVal[4] == 'S') && href.AttrVal[5] == ':' {
// href.AttrVal = href.AttrVal[6:]
// }
// }
// }
// }
}
} else if t.Hash == html.Meta {
if attr := getAttributes(tb, &attrIntBuffer, &attrTokenBuffer, html.Content, html.Http_Equiv, html.Charset, html.Name); attr != nil {
if content := attr[0]; content != nil {
if httpEquiv := attr[1]; httpEquiv != nil {
content.AttrVal = minify.ContentType(content.AttrVal)
if charset := attr[2]; charset == nil && parse.EqualFold(httpEquiv.AttrVal, []byte("content-type")) && parse.Equal(content.AttrVal, []byte("text/html;charset=utf-8")) {
httpEquiv.Data = nil
content.Data = []byte("charset")
content.Hash = html.Charset
content.AttrVal = []byte("utf-8")
} else if parse.EqualFold(httpEquiv.AttrVal, []byte("content-style-type")) {
defaultStyleType = string(content.AttrVal)
defaultInlineStyleType = defaultStyleType + ";inline=1"
} else if parse.EqualFold(httpEquiv.AttrVal, []byte("content-script-type")) {
defaultScriptType = string(content.AttrVal)
}
}
if name := attr[3]; name != nil {
if parse.EqualFold(name.AttrVal, []byte("keywords")) {
content.AttrVal = bytes.Replace(content.AttrVal, []byte(", "), []byte(","), -1)
} else if parse.EqualFold(name.AttrVal, []byte("viewport")) {
content.AttrVal = bytes.Replace(content.AttrVal, []byte(" "), []byte(""), -1)
}
}
}
}
} else if t.Hash == html.Script {
if attr := getAttributes(tb, &attrIntBuffer, &attrTokenBuffer, html.Src, html.Charset); attr != nil {
if src := attr[0]; src != nil {
if charset := attr[1]; charset != nil {
charset.Data = nil
}
}
}
}
// write attributes
for {
attr := *tb.Shift()
if attr.TokenType != html.AttributeToken {
break
} else if attr.Data == nil {
continue // removed attribute
}
val := attr.AttrVal
if len(val) > 1 && (val[0] == '"' || val[0] == '\'') {
val = parse.Trim(val[1:len(val)-1], parse.IsWhitespace)
}
if len(val) == 0 && (attr.Hash == html.Class ||
attr.Hash == html.Dir ||
attr.Hash == html.Id ||
attr.Hash == html.Lang ||
attr.Hash == html.Name ||
attr.Hash == html.Title ||
attr.Hash == html.Action && t.Hash == html.Form ||
attr.Hash == html.Value && t.Hash == html.Input) {
continue // omit empty attribute values
}
if caseInsensitiveAttrMap[attr.Hash] {
val = parse.ToLower(val)
if attr.Hash == html.Enctype || attr.Hash == html.Codetype || attr.Hash == html.Accept || attr.Hash == html.Type && (t.Hash == html.A || t.Hash == html.Link || t.Hash == html.Object || t.Hash == html.Param || t.Hash == html.Script || t.Hash == html.Style || t.Hash == html.Source) {
val = minify.ContentType(val)
}
}
if rawTag != 0 && attr.Hash == html.Type {
rawTagMediatype = val
}
// default attribute values can be ommited
if attr.Hash == html.Type && (t.Hash == html.Script && parse.Equal(val, []byte("text/javascript")) ||
t.Hash == html.Style && parse.Equal(val, []byte("text/css")) ||
t.Hash == html.Link && parse.Equal(val, []byte("text/css")) ||
t.Hash == html.Input && parse.Equal(val, []byte("text")) ||
t.Hash == html.Button && parse.Equal(val, []byte("submit"))) ||
attr.Hash == html.Language && t.Hash == html.Script ||
attr.Hash == html.Method && parse.Equal(val, []byte("get")) ||
attr.Hash == html.Enctype && parse.Equal(val, []byte("application/x-www-form-urlencoded")) ||
attr.Hash == html.Colspan && parse.Equal(val, []byte("1")) ||
attr.Hash == html.Rowspan && parse.Equal(val, []byte("1")) ||
attr.Hash == html.Shape && parse.Equal(val, []byte("rect")) ||
attr.Hash == html.Span && parse.Equal(val, []byte("1")) ||
attr.Hash == html.Clear && parse.Equal(val, []byte("none")) ||
attr.Hash == html.Frameborder && parse.Equal(val, []byte("1")) ||
attr.Hash == html.Scrolling && parse.Equal(val, []byte("auto")) ||
attr.Hash == html.Valuetype && parse.Equal(val, []byte("data")) ||
attr.Hash == html.Media && t.Hash == html.Style && parse.Equal(val, []byte("all")) {
continue
}
// CSS and JS minifiers for attribute inline code
if attr.Hash == html.Style {
attrMinifyBuffer.Reset()
if m.Minify(defaultInlineStyleType, attrMinifyBuffer, buffer.NewReader(val)) == nil {
val = attrMinifyBuffer.Bytes()
}
if len(val) == 0 {
continue
}
} else if len(attr.Data) > 2 && attr.Data[0] == 'o' && attr.Data[1] == 'n' {
if len(val) >= 11 && parse.EqualFold(val[:11], []byte("javascript:")) {
val = val[11:]
}
attrMinifyBuffer.Reset()
if m.Minify(defaultScriptType, attrMinifyBuffer, buffer.NewReader(val)) == nil {
val = attrMinifyBuffer.Bytes()
}
if len(val) == 0 {
continue
}
} else if len(val) > 5 && urlAttrMap[attr.Hash] { // anchors are already handled
// TODO: omit http or https according to URL, specified through options
//if t.Hash != html.A {
// if parse.EqualFold(val[:4], []byte{'h', 't', 't', 'p'}) {
// if val[4] == ':' {
// val = val[5:]
// } else if (val[4] == 's' || val[4] == 'S') && val[5] == ':' {
// val = val[6:]
// }
// }
// } else
if parse.EqualFold(val[:5], []byte{'d', 'a', 't', 'a', ':'}) {
val = minify.DataURI(m, val)
}
}
if _, err := w.Write(spaceBytes); err != nil {
return err
}
if _, err := w.Write(attr.Data); err != nil {
return err
}
if len(val) > 0 && !booleanAttrMap[attr.Hash] {
if _, err := w.Write(isBytes); err != nil {
return err
}
// no quotes if possible, else prefer single or double depending on which occurs more often in value
val = html.EscapeAttrVal(&attrByteBuffer, attr.AttrVal, val)
if _, err := w.Write(val); err != nil {
return err
}
}
}
}
if _, err := w.Write(gtBytes); err != nil {
return err
}
}
}
}
func (l *Lexer) shiftRawText() []byte {
if l.rawTag == Plaintext {
for {
if l.r.Peek(0) == 0 {
return l.r.Shift()
}
l.r.Move(1)
}
} else { // RCDATA, RAWTEXT and SCRIPT
for {
c := l.r.Peek(0)
if c == '<' {
if l.r.Peek(1) == '/' {
mark := l.r.Pos()
l.r.Move(2)
for {
if c = l.r.Peek(0); !('a' <= c && c <= 'z' || 'A' <= c && c <= 'Z') {
break
}
l.r.Move(1)
}
if h := ToHash(parse.ToLower(parse.Copy(l.r.Lexeme()[mark+2:]))); h == l.rawTag { // copy so that ToLower doesn't change the case of the underlying slice
l.r.Rewind(mark)
return l.r.Shift()
}
} else if l.rawTag == Script && l.r.Peek(1) == '!' && l.r.Peek(2) == '-' && l.r.Peek(3) == '-' {
l.r.Move(4)
inScript := false
for {
c := l.r.Peek(0)
if c == '-' && l.r.Peek(1) == '-' && l.r.Peek(2) == '>' {
l.r.Move(3)
break
} else if c == '<' {
isEnd := l.r.Peek(1) == '/'
if isEnd {
l.r.Move(2)
} else {
l.r.Move(1)
}
mark := l.r.Pos()
for {
if c = l.r.Peek(0); !('a' <= c && c <= 'z' || 'A' <= c && c <= 'Z') {
break
}
l.r.Move(1)
}
if h := ToHash(parse.ToLower(parse.Copy(l.r.Lexeme()[mark:]))); h == Script { // copy so that ToLower doesn't change the case of the underlying slice
if !isEnd {
inScript = true
} else {
if !inScript {
l.r.Rewind(mark - 2)
return l.r.Shift()
}
inScript = false
}
}
} else if c == 0 {
return l.r.Shift()
}
l.r.Move(1)
}
} else {
l.r.Move(1)
}
} else if c == 0 {
return l.r.Shift()
} else {
l.r.Move(1)
}
}
}
}