Feat/streaming optimization

.github/workflows/test.yml

@@ -16,7 +16,7 @@ jobs:
     - name: Set up Go
       uses: actions/setup-go@v4
       with:
-        go-version: '1.20'
+        go-version: '1.24'
 
     - name: Install dependencies
       run: go mod download

go.mod

@@ -1,11 +1,17 @@
 module github.com/asticode/go-astisub
 
-go 1.13
+go 1.24.0
 
 require (
-	github.com/asticode/go-astikit v0.20.0
-	github.com/asticode/go-astits v1.8.0
+	github.com/asticode/go-astikit v0.58.0
+	github.com/asticode/go-astits v1.15.0
 	github.com/stretchr/testify v1.4.0
-	golang.org/x/net v0.0.0-20200904194848-62affa334b73
-	golang.org/x/text v0.3.2
+	golang.org/x/net v0.49.0
+	golang.org/x/text v0.33.0
+)
+
+require (
+	github.com/davecgh/go-spew v1.1.0 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	gopkg.in/yaml.v2 v2.2.2 // indirect
 )

go.sum

@@ -1,27 +1,151 @@
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-github.com/asticode/go-astikit v0.20.0/go.mod h1:h4ly7idim1tNhaVkdVBeXQZEE3L0xblP7fCWbgwipF0=
-github.com/asticode/go-astits v1.8.0 h1:rf6aiiGn/QhlFjNON1n5plqF3Fs025XLUwiQ0NB6oZg=
-github.com/asticode/go-astits v1.8.0/go.mod h1:DkOWmBNQpnr9mv24KfZjq4JawCFX1FCqjLVGvO0DygQ=
+github.com/asticode/go-astikit v0.30.0/go.mod h1:h4ly7idim1tNhaVkdVBeXQZEE3L0xblP7fCWbgwipF0=
+github.com/asticode/go-astikit v0.58.0 h1:WXNpaxCPNFReikHiXvzyDv49NpV/GMD6PV80iem6WGo=
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 github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
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 github.com/pkg/profile v1.4.0/go.mod h1:NWz/XGvpEW1FyYQ7fCx4dqYBLlfTcE+A9FLAkNKqjFE=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
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+golang.org/x/text v0.7.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
+golang.org/x/text v0.9.0/go.mod h1:e1OnstbJyHTd6l/uOt8jFFHp6TRDWZR/bV3emEE/zU8=
+golang.org/x/text v0.13.0/go.mod h1:TvPlkZtksWOMsz7fbANvkp4WM8x/WCo/om8BMLbz+aE=
+golang.org/x/text v0.14.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
+golang.org/x/text v0.15.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
+golang.org/x/text v0.25.0/go.mod h1:WEdwpYrmk1qmdHvhkSTNPm3app7v4rsT8F2UD6+VHIA=
+golang.org/x/text v0.26.0/go.mod h1:QK15LZJUUQVJxhz7wXgxSy/CJaTFjd0G+YLonydOVQA=
+golang.org/x/text v0.27.0/go.mod h1:1D28KMCvyooCX9hBiosv5Tz/+YLxj0j7XhWjpSUF7CU=
+golang.org/x/text v0.28.0/go.mod h1:U8nCwOR8jO/marOQ0QbDiOngZVEBB7MAiitBuMjXiNU=
+golang.org/x/text v0.29.0/go.mod h1:7MhJOA9CD2qZyOKYazxdYMF85OwPdEr9jTtBpO7ydH4=
+golang.org/x/text v0.30.0/go.mod h1:yDdHFIX9t+tORqspjENWgzaCVXgk0yYnYuSZ8UzzBVM=
+golang.org/x/text v0.31.0/go.mod h1:tKRAlv61yKIjGGHX/4tP1LTbc13YSec1pxVEWXzfoeM=
+golang.org/x/text v0.32.0/go.mod h1:o/rUWzghvpD5TXrTIBuJU77MTaN0ljMWE47kxGJQ7jY=
+golang.org/x/text v0.33.0 h1:B3njUFyqtHDUI5jMn1YIr5B0IE2U0qck04r6d4KPAxE=
+golang.org/x/text v0.33.0/go.mod h1:LuMebE6+rBincTi9+xWTY8TztLzKHc/9C1uBCG27+q8=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
+golang.org/x/tools v0.6.0/go.mod h1:Xwgl3UAJ/d3gWutnCtw505GrjyAbvKui8lOU390QaIU=
+golang.org/x/tools v0.13.0/go.mod h1:HvlwmtVNQAhOuCjW7xxvovg8wbNq7LwfXh/k7wXUl58=
+golang.org/x/tools v0.21.1-0.20240508182429-e35e4ccd0d2d/go.mod h1:aiJjzUbINMkxbQROHiO6hDPo2LHcIPhhQsa9DLh0yGk=
+golang.org/x/tools v0.33.0/go.mod h1:CIJMaWEY88juyUfo7UbgPqbC8rU2OqfAV1h2Qp0oMYI=
+golang.org/x/tools v0.34.0/go.mod h1:pAP9OwEaY1CAW3HOmg3hLZC5Z0CCmzjAF2UQMSqNARg=
+golang.org/x/tools v0.35.0/go.mod h1:NKdj5HkL/73byiZSJjqJgKn3ep7KjFkBOkR/Hps3VPw=
+golang.org/x/tools v0.36.0/go.mod h1:WBDiHKJK8YgLHlcQPYQzNCkUxUypCaa5ZegCVutKm+s=
+golang.org/x/tools v0.37.0/go.mod h1:MBN5QPQtLMHVdvsbtarmTNukZDdgwdwlO5qGacAzF0w=
+golang.org/x/tools v0.38.0/go.mod h1:yEsQ/d/YK8cjh0L6rZlY8tgtlKiBNTL14pGDJPJpYQs=
+golang.org/x/tools v0.39.0/go.mod h1:JnefbkDPyD8UU2kI5fuf8ZX4/yUeh9W877ZeBONxUqQ=
+golang.org/x/tools v0.40.0/go.mod h1:Ik/tzLRlbscWpqqMRjyWYDisX8bG13FrdXp3o4Sr9lc=
+golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=

srt.go

@@ -8,6 +8,7 @@ import (
 	"time"
 	"unicode/utf8"
 
+	"github.com/asticode/go-astikit"
 	"golang.org/x/net/html"
 )
 
@@ -223,49 +224,60 @@ func (s Subtitles) WriteToSRT(o io.Writer) (err error) {
 		return
 	}
 
+	// Init chainer
+	c := astikit.NewWriteChainer(o)
+
 	// Add BOM header
-	var c []byte
-	c = append(c, BytesBOM...)
+	if _, err = c.Write(astikit.WriteWithLabel("bom", BytesBOM)); err != nil {
+		return
+	}
 
 	// Loop through subtitles
 	for k, v := range s.Items {
 		// Add time boundaries
-		c = append(c, []byte(strconv.Itoa(k+1))...)
-		c = append(c, bytesLineSeparator...)
-		c = append(c, []byte(formatDurationSRT(v.StartAt))...)
-		c = append(c, bytesSRTTimeBoundariesSeparator...)
-		c = append(c, []byte(formatDurationSRT(v.EndAt))...)
-		c = append(c, bytesLineSeparator...)
+		if _, err = c.Write(
+			astikit.WriteWithLabel("index", []byte(strconv.Itoa(k+1))),
+			astikit.WriteWithLabel("line separator", bytesLineSeparator),
+			astikit.WriteWithLabel("start at", []byte(formatDurationSRT(v.StartAt))),
+			astikit.WriteWithLabel("time boundaries separator", bytesSRTTimeBoundariesSeparator),
+			astikit.WriteWithLabel("end at", []byte(formatDurationSRT(v.EndAt))),
+			astikit.WriteWithLabel("line separator", bytesLineSeparator),
+		); err != nil {
+			return
+		}
 
 		// Loop through lines
 		for _, l := range v.Lines {
-			c = append(c, []byte(l.srtBytes())...)
+			if err = l.writeSRT(c); err != nil {
+				err = fmt.Errorf("astisub: writing line item failed: %w", err)
+				return
+			}
 		}
 
 		// Add new line
-		c = append(c, bytesLineSeparator...)
-	}
-
-	// Remove last new line
-	c = c[:len(c)-1]
-
-	// Write
-	if _, err = o.Write(c); err != nil {
-		err = fmt.Errorf("astisub: writing failed: %w", err)
-		return
+		if k < len(s.Items)-1 {
+			if _, err = c.Write(astikit.WriteWithLabel("line separator", bytesLineSeparator)); err != nil {
+				return
+			}
+		}
 	}
 	return
 }
 
-func (l Line) srtBytes() (c []byte) {
+func (l Line) writeSRT(c *astikit.WriteChainer) (err error) {
 	for _, li := range l.Items {
-		c = append(c, li.srtBytes()...)
+		if err = li.writeSRT(c); err != nil {
+			err = fmt.Errorf("astisub: writing line item failed: %w", err)
+			return
+		}
+	}
+	if _, err = c.Write(astikit.WriteWithLabel("line separator", bytesLineSeparator)); err != nil {
+		return
 	}
-	c = append(c, bytesLineSeparator...)
 	return
 }
 
-func (li LineItem) srtBytes() (c []byte) {
+func (li LineItem) writeSRT(c *astikit.WriteChainer) (err error) {
 	// Get color
 	var color string
 	if li.InlineStyle != nil && li.InlineStyle.SRTColor != nil {
@@ -283,34 +295,20 @@ func (li LineItem) srtBytes() (c []byte) {
 		pos = li.InlineStyle.SRTPosition
 	}
 
-	// Append
-	if color != "" {
-		c = append(c, []byte("<font color=\""+color+"\">")...)
-	}
-	if b {
-		c = append(c, []byte("<b>")...)
-	}
-	if i {
-		c = append(c, []byte("<i>")...)
-	}
-	if u {
-		c = append(c, []byte("<u>")...)
-	}
-	if pos != 0 {
-		c = append(c, []byte(fmt.Sprintf(`{\an%d}`, pos))...)
-	}
-	c = append(c, []byte(escapeHTML(li.Text))...)
-	if u {
-		c = append(c, []byte("</u>")...)
-	}
-	if i {
-		c = append(c, []byte("</i>")...)
-	}
-	if b {
-		c = append(c, []byte("</b>")...)
-	}
-	if color != "" {
-		c = append(c, []byte("</font>")...)
+	// Write
+	if _, err = c.Write(
+		astikit.WriteWithCondition("font color", []byte("<font color=\""+color+"\">"), color != ""),
+		astikit.WriteWithCondition("bold", []byte("<b>"), b),
+		astikit.WriteWithCondition("italics", []byte("<i>"), i),
+		astikit.WriteWithCondition("underline", []byte("<u>"), u),
+		astikit.WriteWithCondition("position", []byte(fmt.Sprintf(`{\an%d}`, pos)), pos != 0),
+		astikit.WriteWithLabel("text", []byte(escapeHTML(li.Text))),
+		astikit.WriteWithCondition("underline close", []byte("</u>"), u),
+		astikit.WriteWithCondition("italics close", []byte("</i>"), i),
+		astikit.WriteWithCondition("bold close", []byte("</b>"), b),
+		astikit.WriteWithCondition("font close", []byte("</font>"), color != ""),
+	); err != nil {
+		return
 	}
 	return
 }

srt_test.go

@@ -171,3 +171,16 @@ func TestSRTParseDuration(t *testing.T) {
 	assert.Equal(t, 5*time.Second+985*time.Millisecond, s.Items[1].EndAt)
 	assert.Equal(t, "Duration without colon milliseconds", s.Items[1].Lines[0].String())
 }
+
+func BenchmarkWriteToSRT(b *testing.B) {
+	s, err := astisub.OpenFile("./testdata/example-in.srt")
+	if err != nil {
+		b.Fatal(err)
+	}
+	w := &bytes.Buffer{}
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		w.Reset()
+		s.WriteToSRT(w)
+	}
+}