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67 lines
2.6 KiB
Go
67 lines
2.6 KiB
Go
// Package stripmd strips Markdown from text
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package stripmd
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import (
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"regexp"
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)
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var (
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listLeadersReg = regexp.MustCompile(`(?m)^([\s\t]*)([\*\-\+]|\d\.)\s+`)
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headerReg = regexp.MustCompile(`\n={2,}`)
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strikeReg = regexp.MustCompile(`~~`)
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codeReg = regexp.MustCompile("`{3}" + `.*\n`)
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htmlReg = regexp.MustCompile("<(.*?)>")
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emphReg = regexp.MustCompile(`\*\*([^*]+)\*\*`)
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emphReg2 = regexp.MustCompile(`\*([^*]+)\*`)
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emphReg3 = regexp.MustCompile(`__([^_]+)__`)
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emphReg4 = regexp.MustCompile(`_([^_]+)_`)
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setextHeaderReg = regexp.MustCompile(`^[=\-]{2,}\s*$`)
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footnotesReg = regexp.MustCompile(`\[\^.+?\](\: .*?$)?`)
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footnotes2Reg = regexp.MustCompile(`\s{0,2}\[.*?\]: .*?$`)
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imagesReg = regexp.MustCompile(`\!\[(.*?)\]\s?[\[\(].*?[\]\)]`)
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linksReg = regexp.MustCompile(`\[(.*?)\][\[\(].*?[\]\)]`)
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blockquoteReg = regexp.MustCompile(`>\s*`)
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refLinkReg = regexp.MustCompile(`^\s{1,2}\[(.*?)\]: (\S+)( ".*?")?\s*$`)
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atxHeaderReg = regexp.MustCompile(`(?m)^\#{1,6}\s*([^#]+)\s*(\#{1,6})?$`)
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atxHeaderReg2 = regexp.MustCompile(`([\*_]{1,3})(\S.*?\S)?P1`)
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atxHeaderReg3 = regexp.MustCompile("(?m)(`{3,})" + `(.*?)?P1`)
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atxHeaderReg4 = regexp.MustCompile(`^-{3,}\s*$`)
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atxHeaderReg5 = regexp.MustCompile("`(.+?)`")
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atxHeaderReg6 = regexp.MustCompile(`\n{2,}`)
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)
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// Strip returns the given string sans any Markdown.
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// Where necessary, elements are replaced with their best textual forms, so
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// for example, hyperlinks are stripped of their URL and become only the link
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// text, and images lose their URL and become only the alt text.
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func Strip(s string) string {
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res := s
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res = listLeadersReg.ReplaceAllString(res, "$1")
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res = headerReg.ReplaceAllString(res, "\n")
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res = strikeReg.ReplaceAllString(res, "")
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res = codeReg.ReplaceAllString(res, "")
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res = emphReg.ReplaceAllString(res, "$1")
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res = emphReg2.ReplaceAllString(res, "$1")
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res = emphReg3.ReplaceAllString(res, "$1")
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res = emphReg4.ReplaceAllString(res, "$1")
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res = htmlReg.ReplaceAllString(res, "$1")
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res = setextHeaderReg.ReplaceAllString(res, "")
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res = footnotesReg.ReplaceAllString(res, "")
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res = footnotes2Reg.ReplaceAllString(res, "")
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res = imagesReg.ReplaceAllString(res, "$1")
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res = linksReg.ReplaceAllString(res, "$1")
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res = blockquoteReg.ReplaceAllString(res, " ")
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res = refLinkReg.ReplaceAllString(res, "")
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res = atxHeaderReg.ReplaceAllString(res, "$1")
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res = atxHeaderReg2.ReplaceAllString(res, "$2")
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res = atxHeaderReg3.ReplaceAllString(res, "$2")
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res = atxHeaderReg4.ReplaceAllString(res, "")
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res = atxHeaderReg5.ReplaceAllString(res, "$1")
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res = atxHeaderReg6.ReplaceAllString(res, "\n\n")
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return res
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}
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