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package commonmark
import (
"bytes"
"strings"
"github.com/JohannesKaufmann/dom"
"github.com/JohannesKaufmann/html-to-markdown/v2/converter"
"github.com/JohannesKaufmann/html-to-markdown/v2/internal/textutils"
"golang.org/x/net/html"
)
func escapeAlt(altString string) string {
alt := []byte(altString)
var buf bytes.Buffer
for i := range alt {
if alt[i] == '[' || alt[i] == ']' {
prevIndex := i - 1
if prevIndex < 0 || alt[prevIndex] != '\\' {
buf.WriteRune('\\')
}
}
buf.WriteByte(alt[i])
}
return buf.String()
}
func (c *commonmark) renderImage(ctx converter.Context, w converter.Writer, n *html.Node) converter.RenderStatus {
src := dom.GetAttributeOr(n, "src", "")
src = strings.TrimSpace(src)
if src == "" {
return converter.RenderTryNext
}
src = ctx.AssembleAbsoluteURL(ctx, "img", src)
title := dom.GetAttributeOr(n, "title", "")
title = strings.ReplaceAll(title, "\n", " ")
alt := dom.GetAttributeOr(n, "alt", "")
alt = strings.ReplaceAll(alt, "\n", " ")
// The alt description will be placed between two square brackets `[alt]`
// so make sure that those characters are escaped.
alt = escapeAlt(alt)
w.WriteRune('!')
w.WriteRune('[')
w.WriteString(alt)
w.WriteRune(']')
w.WriteRune('(')
w.WriteString(src)
if title != "" {
// The destination and title must be seperated by a space
w.WriteRune(' ')
w.Write(textutils.SurroundByQuotes([]byte(title)))
}
w.WriteRune(')')
return converter.RenderSuccess
}
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