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jfa-go/stripmd.go

47 lines
1.2 KiB

package main
import (
"strings"
stripmd "github.com/writeas/go-strip-markdown"
)
// StripAltText removes Markdown alt text from links and images and replaces them with just the URL.
// Currently uses the deepest alt text when links/images are nested.
func StripAltText(md string) string {
altTextStart := -1 // Start of alt text (between '[' & ']')
URLStart := -1 // Start of url (between '(' & ')')
URLEnd := -1
previousURLEnd := -2
out := ""
for i := range md {
if altTextStart != -1 && URLStart != -1 && md[i] == ')' {
URLEnd = i - 1
out += md[previousURLEnd+2:altTextStart-1] + md[URLStart:URLEnd+1]
previousURLEnd = URLEnd
altTextStart, URLStart, URLEnd = -1, -1, -1
continue
}
if md[i] == '[' && altTextStart == -1 {
altTextStart = i + 1
if i > 0 && md[i-1] == '!' {
altTextStart--
}
}
if i > 0 && md[i-1] == ']' && md[i] == '(' && URLStart == -1 {
URLStart = i + 1
}
}
if previousURLEnd+1 != len(md)-1 {
out += md[previousURLEnd+2:]
}
if out == "" {
return md
}
return out
}
func stripMarkdown(md string) string {
return strings.TrimPrefix(strings.TrimSuffix(stripmd.Strip(StripAltText(md)), "</p>"), "<p>")
}