2021-02-20 01:03:11 +00:00
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package main
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import (
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"strings"
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stripmd "github.com/writeas/go-strip-markdown"
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)
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2021-05-21 20:59:50 +00:00
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type Link struct {
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Alt, URL string
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}
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2021-03-26 23:13:19 +00:00
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// StripAltText removes Markdown alt text from links and images and replaces them with just the URL.
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// Currently uses the deepest alt text when links/images are nested.
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2021-05-21 20:59:50 +00:00
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// If links = true, links are completely removed, and a list of URLs and their alt text is also returned.
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func StripAltText(md string, links bool) (string, []Link) {
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2021-03-26 23:13:19 +00:00
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altTextStart := -1 // Start of alt text (between '[' & ']')
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URLStart := -1 // Start of url (between '(' & ')')
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URLEnd := -1
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previousURLEnd := -2
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out := ""
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2021-05-21 20:59:50 +00:00
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embeds := []Link{}
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2021-03-26 23:13:19 +00:00
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for i := range md {
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if altTextStart != -1 && URLStart != -1 && md[i] == ')' {
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URLEnd = i - 1
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2021-05-21 20:59:50 +00:00
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out += md[previousURLEnd+2 : altTextStart-1]
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if links {
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embeds = append(embeds, Link{
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URL: md[URLStart : URLEnd+1],
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Alt: md[altTextStart : URLStart-2],
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})
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} else {
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out += md[URLStart : URLEnd+1]
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}
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2021-03-26 23:13:19 +00:00
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previousURLEnd = URLEnd
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altTextStart, URLStart, URLEnd = -1, -1, -1
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2021-02-20 01:03:11 +00:00
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continue
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}
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2021-03-26 23:13:19 +00:00
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if md[i] == '[' && altTextStart == -1 {
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altTextStart = i + 1
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if i > 0 && md[i-1] == '!' {
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altTextStart--
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2021-02-20 01:03:11 +00:00
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}
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}
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2021-03-26 23:13:19 +00:00
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if i > 0 && md[i-1] == ']' && md[i] == '(' && URLStart == -1 {
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URLStart = i + 1
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2021-02-20 22:49:59 +00:00
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}
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2021-02-20 01:03:11 +00:00
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}
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2021-03-26 23:13:19 +00:00
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if previousURLEnd+1 != len(md)-1 {
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out += md[previousURLEnd+2:]
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}
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if out == "" {
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2021-05-21 20:59:50 +00:00
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return md, embeds
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2021-02-20 01:03:11 +00:00
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}
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2021-05-21 20:59:50 +00:00
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return out, embeds
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2021-03-26 23:13:19 +00:00
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}
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func stripMarkdown(md string) string {
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2021-05-21 20:59:50 +00:00
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stripped, _ := StripAltText(md, false)
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return strings.TrimPrefix(strings.TrimSuffix(stripmd.Strip(stripped), "</p>"), "<p>")
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2021-02-20 01:03:11 +00:00
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}
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