66 lines
1.4 KiB
Go
66 lines
1.4 KiB
Go
package utilities
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import (
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"io"
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"strconv"
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"strings"
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"golang.org/x/net/html"
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)
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const (
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htmlNoList int = iota
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htmlOrderedList
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htmlUnorderedList
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)
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func ConvertHTMLToText(text string) string {
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var builder strings.Builder
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htmlList := htmlNoList
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orderedListNumber := 1
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token := html.NewTokenizer(strings.NewReader(text))
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for {
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tt := token.Next()
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switch tt {
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case html.ErrorToken:
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return builder.String()
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case html.TextToken:
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text := token.Token().Data
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builder.WriteString(text)
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case html.StartTagToken, html.EndTagToken:
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tag := token.Token().String()
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htmlList, orderedListNumber = processTagToken(&builder, tag, htmlList, orderedListNumber)
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}
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}
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}
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func processTagToken(writer io.StringWriter, tag string, htmlList, orderedListNumber int) (int, int) {
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switch tag {
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case "<br>", "<p>", "</p>", "</li>":
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_, _ = writer.WriteString("\n")
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case "<ul>":
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htmlList = htmlUnorderedList
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_, _ = writer.WriteString("\n")
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case "<ol>":
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htmlList = htmlOrderedList
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_, _ = writer.WriteString("\n")
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case "</ul>":
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htmlList = htmlNoList
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case "</ol>":
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htmlList = htmlNoList
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orderedListNumber = 1
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case "<li>":
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switch htmlList {
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case htmlUnorderedList:
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_, _ = writer.WriteString("• ")
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case htmlOrderedList:
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_, _ = writer.WriteString(strconv.Itoa(orderedListNumber) + ". ")
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orderedListNumber++
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}
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}
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return htmlList, orderedListNumber
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}
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