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9f069df | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 | package main
import (
"context"
"io"
"strings"
"github.com/yuin/goldmark"
"github.com/yuin/goldmark/ast"
"github.com/yuin/goldmark/extension"
"github.com/yuin/goldmark/text"
"golang.org/x/net/html"
"sort"
)
type htmlReplacement struct {
Start int
Stop int
Value string
}
func translateHTMLBlocks(ctx context.Context, translator *PiTranslator, body, srcLang, tgtLang string) (string, error) {
source := []byte(body)
r := text.NewReader(source)
md := goldmark.New(
goldmark.WithExtensions(extension.GFM),
)
doc := md.Parser().Parse(r)
replacements := make([]htmlReplacement, 0, 8)
_ = ast.Walk(doc, func(n ast.Node, entering bool) (ast.WalkStatus, error) {
if !entering {
return ast.WalkContinue, nil
}
block, ok := n.(*ast.HTMLBlock)
if !ok {
return ast.WalkContinue, nil
}
start, stop, ok := htmlBlockSpan(block, source)
if !ok {
return ast.WalkSkipChildren, nil
}
htmlText := string(source[start:stop])
translated, err := translateHTMLBlock(ctx, translator, htmlText, srcLang, tgtLang)
if err != nil {
return ast.WalkStop, err
}
replacements = append(replacements, htmlReplacement{Start: start, Stop: stop, Value: translated})
return ast.WalkSkipChildren, nil
})
if len(replacements) == 0 {
return body, nil
}
return applyHTMLReplacements(body, replacements), nil
}
func htmlBlockSpan(block *ast.HTMLBlock, source []byte) (int, int, bool) {
lines := block.Lines()
if lines.Len() == 0 {
return 0, 0, false
}
start := lines.At(0).Start
stop := lines.At(lines.Len() - 1).Stop
if start >= stop {
return 0, 0, false
}
return start, stop, true
}
func applyHTMLReplacements(body string, replacements []htmlReplacement) string {
if len(replacements) == 0 {
return body
}
sortHTMLReplacements(replacements)
var out strings.Builder
last := 0
for _, rep := range replacements {
if rep.Start < last {
continue
}
out.WriteString(body[last:rep.Start])
out.WriteString(rep.Value)
last = rep.Stop
}
out.WriteString(body[last:])
return out.String()
}
func sortHTMLReplacements(replacements []htmlReplacement) {
sort.Slice(replacements, func(i, j int) bool {
return replacements[i].Start < replacements[j].Start
})
}
func translateHTMLBlock(ctx context.Context, translator *PiTranslator, htmlText, srcLang, tgtLang string) (string, error) {
tokenizer := html.NewTokenizer(strings.NewReader(htmlText))
var out strings.Builder
skipDepth := 0
for {
tt := tokenizer.Next()
if tt == html.ErrorToken {
if err := tokenizer.Err(); err != nil && err != io.EOF {
return "", err
}
break
}
raw := string(tokenizer.Raw())
tok := tokenizer.Token()
switch tt {
case html.StartTagToken:
out.WriteString(raw)
if isSkipTag(strings.ToLower(tok.Data)) {
skipDepth++
}
case html.EndTagToken:
out.WriteString(raw)
if isSkipTag(strings.ToLower(tok.Data)) && skipDepth > 0 {
skipDepth--
}
case html.SelfClosingTagToken:
out.WriteString(raw)
case html.TextToken:
if shouldTranslateHTMLText(skipDepth, raw) {
translated, err := translator.Translate(ctx, raw, srcLang, tgtLang)
if err != nil {
return "", err
}
out.WriteString(translated)
} else {
out.WriteString(raw)
}
default:
out.WriteString(raw)
}
}
return out.String(), nil
}
func shouldTranslateHTMLText(skipDepth int, text string) bool {
if strings.TrimSpace(text) == "" {
return false
}
return skipDepth == 0
}
func isSkipTag(tag string) bool {
switch tag {
case "code", "pre", "script", "style":
return true
default:
return false
}
}
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