75 lines
1.5 KiB
Go
75 lines
1.5 KiB
Go
// SPDX-FileCopyrightText: 2024 Dan Anglin <d.n.i.anglin@gmail.com>
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//
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// SPDX-License-Identifier: GPL-3.0-or-later
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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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type htmlConvertState struct {
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htmlListType int
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orderedListIndex int
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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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state := htmlConvertState{
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htmlListType: htmlNoList,
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orderedListIndex: 1,
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}
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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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processTagToken(&state, &builder, tag)
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}
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}
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}
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func processTagToken(state *htmlConvertState, writer io.StringWriter, tag string) {
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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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state.htmlListType = htmlUnorderedList
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_, _ = writer.WriteString("\n")
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case "<ol>":
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state.htmlListType = htmlOrderedList
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_, _ = writer.WriteString("\n")
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case "</ul>":
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state.htmlListType = htmlNoList
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case "</ol>":
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state.htmlListType = htmlNoList
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state.orderedListIndex = 1
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case "<li>":
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switch state.htmlListType {
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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(state.orderedListIndex) + ". ")
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state.orderedListIndex++
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}
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}
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}
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