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package commonmark
import (
"bytes"
"fmt"
"strconv"
"unicode/utf8"
"github.com/JohannesKaufmann/dom"
"github.com/JohannesKaufmann/html-to-markdown/v2/converter"
"github.com/JohannesKaufmann/html-to-markdown/v2/internal/textutils"
"github.com/JohannesKaufmann/html-to-markdown/v2/marker"
"golang.org/x/net/html"
)
func getStartAt(node *html.Node) int {
startVal := dom.GetAttributeOr(node, "start", "1")
startAt, err := strconv.Atoi(startVal)
if err != nil {
startAt = 1
}
return startAt
}
func (c commonmark) getPrefixFunc(n *html.Node, sliceLength int) func(int) string {
startAt := getStartAt(n)
return func(sliceIndex int) string {
if n.Data == "ul" {
return c.BulletListMarker + " "
}
currentIndex := startAt + sliceIndex
lastIndex := startAt + sliceLength - 1
maxLength := utf8.RuneCountInString(strconv.Itoa(lastIndex))
// Pad the numbers so that all prefix numbers in the list take up the same space
// `%02d.` -> "01. "
format := `%0` + strconv.Itoa(maxLength) + `d. `
return fmt.Sprintf(format, currentIndex)
}
}
func renderMultiLineListItem(w converter.Writer, content []byte, indentCount int) {
lines := bytes.Split(content, []byte("\n"))
indent := bytes.Repeat([]byte(" "), indentCount)
indentedCodeBlockNewline := append(marker.BytesMarkerCodeBlockNewline, indent...)
for i := range lines {
// Add indent to code block newlines
line := bytes.ReplaceAll(lines[i], marker.BytesMarkerCodeBlockNewline, indentedCodeBlockNewline)
if i != 0 {
// The first line is already indented through the prefix,
// all other lines need the correct amount of spaces.
w.Write(indent)
}
w.Write(line)
if i < len(lines)-1 {
w.WriteRune('\n')
}
}
}
func (c commonmark) renderListContainer(ctx converter.Context, w converter.Writer, n *html.Node) converter.RenderStatus {
children := dom.AllChildNodes(n)
items := make([][]byte, 0, len(children))
for _, child := range children {
var buf bytes.Buffer
ctx.RenderNodes(ctx, &buf, child)
content := buf.Bytes()
content = bytes.TrimSpace(content)
if content == nil {
continue
}
items = append(items, content)
}
if len(items) == 0 {
return converter.RenderSuccess
}
getPrefix := c.getPrefixFunc(n, len(items))
indentCount := utf8.RuneCountInString(getPrefix(0))
w.WriteString("\n\n")
for i, item := range items {
w.WriteString(getPrefix(i))
item = textutils.TrimConsecutiveNewlines(item)
item = textutils.TrimUnnecessaryHardLineBreaks(item)
item = ctx.UnEscapeContent(item)
// An item might have different lines that each
// must be indented with the correct count of spaces.
renderMultiLineListItem(w, item, indentCount)
if i < len(items)-1 {
w.WriteRune('\n')
}
}
w.WriteString("\n\n")
return converter.RenderSuccess
}
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