mirror of
https://github.com/Luzifer/badge-gen.git
synced 2024-11-13 23:52:43 +00:00
517 lines
15 KiB
Go
517 lines
15 KiB
Go
// Package css minifies CSS3 following the specifications at http://www.w3.org/TR/css-syntax-3/.
|
|
package 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(";")
|
|
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
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////
|
|
|
|
// 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 (&Minifier{Decimals: -1}).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,
|
|
}
|
|
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 {
|
|
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.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.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:]
|
|
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
|
|
}
|