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Copy pathsvg.go
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Copy pathsvg.go
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314 lines (300 loc) · 8.15 KB
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// Package svg minifies SVG1.1 following the specifications at http://www.w3.org/TR/SVG11/.
package svg // import "github.com/tdewolff/minify/svg"
import (
"io"
"github.com/tdewolff/buffer"
"github.com/tdewolff/minify"
minifyCSS "github.com/tdewolff/minify/css"
"github.com/tdewolff/parse"
"github.com/tdewolff/parse/css"
"github.com/tdewolff/parse/svg"
"github.com/tdewolff/parse/xml"
)
var (
voidBytes = []byte("/>")
isBytes = []byte("=")
spaceBytes = []byte(" ")
cdataEndBytes = []byte("]]>")
)
////////////////////////////////////////////////////////////////
// Minifier is an SVG minifier.
type Minifier struct{}
// Minify minifies SVG data, it reads from r and writes to w.
func Minify(m *minify.M, w io.Writer, r io.Reader, params map[string]string) error {
return (&Minifier{}).Minify(m, w, r, params)
}
// 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 := "text/css"
defaultInlineStyleType := "text/css;inline=1"
minifyBuffer := buffer.NewWriter(make([]byte, 0, 64))
attrByteBuffer := make([]byte, 0, 64)
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.Minify(defaultStyleType, 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 tag == svg.Style {
minifyBuffer.Reset()
if err := m.Minify(defaultStyleType, minifyBuffer, buffer.NewReader(t.Text)); err != nil && err != minify.ErrNotExist {
return err
} else if err != minify.ErrNotExist {
t.Data = append(t.Data[:9], minifyBuffer.Bytes()...)
t.Text = t.Data[9:]
t.Data = append(t.Data, cdataEndBytes...)
}
}
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[t.Hash] { // skip empty containers
i := 0
for {
next := tb.Peek(i)
i++
if next.TokenType == xml.EndTagToken && next.Hash == t.Hash || 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 t.Hash == svg.Metadata {
for {
if next := *tb.Shift(); (next.TokenType == xml.EndTagToken || next.TokenType == xml.StartTagCloseVoidToken) && next.Hash == t.Hash || next.TokenType == xml.ErrorToken {
break
}
}
break
}
if _, err := w.Write(t.Data); err != nil {
return err
}
case xml.AttributeToken:
if len(t.AttrVal) == 0 {
continue
}
attr := t.Hash
val := t.AttrVal
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 = string(val)
defaultInlineStyleType = defaultStyleType + ";inline=1"
} else if attr == svg.Style {
minifyBuffer.Reset()
if m.Minify(defaultInlineStyleType, minifyBuffer, buffer.NewReader(val)) == nil {
val = minifyBuffer.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 n, m := parse.Dimension(val); n+m == len(val) { // TODO: inefficient, temporary measure
val, _ = shortenDimension(val)
}
// 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 len(t.Data) > 2+len(t.Text) {
t.Data[2+len(t.Text)] = '>'
if _, err := w.Write(t.Data[:2+len(t.Text)+1]); err != nil {
return err
}
} else if _, err := w.Write(t.Data); err != nil {
return err
}
}
}
}
func shortenPathData(b []byte) []byte {
cmd := byte(0)
prevDigit := false
prevDigitRequiresSpace := true
j := 0
start := 0
for i := 0; i < len(b); i++ {
c := b[i]
if c == ' ' || c == ',' || c == '\t' || c == '\n' || c == '\r' {
if start != 0 {
j += copy(b[j:], b[start:i])
} else {
j += i
}
start = i + 1
} else if n := parse.Number(b[i:]); n > 0 {
if start != 0 {
j += copy(b[j:], b[start:i])
} else {
j += i
}
num := minify.Number(b[i : i+n])
if prevDigit && (num[0] >= '0' && num[0] <= '9' || num[0] == '.' && prevDigitRequiresSpace) && j < len(b) {
b[j] = ' '
j++
}
prevDigit = true
prevDigitRequiresSpace = true
for i := 0; i < len(num); i++ {
c := num[i]
if c == '.' || c == 'e' || c == 'E' {
prevDigitRequiresSpace = false
break
}
}
j += copy(b[j:], num)
start = i + n
i += n - 1
} else {
if cmd == c && cmd != 'M' && cmd != 'm' {
if start != 0 {
j += copy(b[j:], b[start:i])
} else {
j += i
}
start = i + 1
} else {
cmd = c
prevDigit = false
}
}
}
if start != 0 {
j += copy(b[j:], b[start:])
return b[:j]
}
return b
}
func shortenDimension(b []byte) ([]byte, int) {
if n, m := parse.Dimension(b); n > 0 {
unit := b[n : n+m]
b = minify.Number(b[:n])
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
}