mirror of https://github.com/hrfee/jfa-go
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47 lines
1.2 KiB
47 lines
1.2 KiB
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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// 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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func StripAltText(md string) string {
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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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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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out += md[previousURLEnd+2:altTextStart-1] + md[URLStart:URLEnd+1]
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previousURLEnd = URLEnd
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altTextStart, URLStart, URLEnd = -1, -1, -1
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continue
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}
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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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}
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}
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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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}
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}
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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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return md
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}
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return out
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}
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func stripMarkdown(md string) string {
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return strings.TrimPrefix(strings.TrimSuffix(stripmd.Strip(StripAltText(md)), "</p>"), "<p>")
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}
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