// // Copyright (c) 2019 Ted Unangst // // Permission to use, copy, modify, and distribute this software for any // purpose with or without fee is hereby granted, provided that the above // copyright notice and this permission notice appear in all copies. // // THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES // WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF // MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR // ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES // WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN // ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF // OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. package main import ( "fmt" "regexp" "strings" "golang.org/x/net/html" ) var re_bolder = regexp.MustCompile(`(^|\W)\*\*([\w\s,.!?':_-]+)\*\*($|\W)`) var re_italicer = regexp.MustCompile(`(^|\W)\*([\w\s,.!?':_-]+)\*($|\W)`) var re_bigcoder = regexp.MustCompile("```\n?((?s:.*?))\n?```\n?") var re_coder = regexp.MustCompile("`([^`]*)`") var re_quoter = regexp.MustCompile(`(?m:^> (.*)\n?)`) var re_link = regexp.MustCompile(`.?.?https?://[^\s"]+[\w/)]`) var re_zerolink = regexp.MustCompile(`\[([^]]*)\]\(([^)]*\)?)\)`) func markitzero(s string) string { // prepare the string s = strings.TrimSpace(s) s = strings.Replace(s, "\r", "", -1) s = html.EscapeString(s) s = strings.Replace(s, "'", "'", -1) // dammit go // save away the code blocks so we don't mess them up further var bigcodes, lilcodes []string s = re_bigcoder.ReplaceAllStringFunc(s, func(code string) string { bigcodes = append(bigcodes, code) return "``````" }) s = re_coder.ReplaceAllStringFunc(s, func(code string) string { lilcodes = append(lilcodes, code) return "`x`" }) // mark it zero s = re_bolder.ReplaceAllString(s, "$1$2$3") s = re_italicer.ReplaceAllString(s, "$1$2$3") s = re_quoter.ReplaceAllString(s, "
$1

") s = re_link.ReplaceAllStringFunc(s, linkreplacer) s = re_zerolink.ReplaceAllString(s, `$1`) // now restore the code blocks s = re_coder.ReplaceAllStringFunc(s, func(s string) string { code := lilcodes[0] lilcodes = lilcodes[1:] return code }) s = re_bigcoder.ReplaceAllStringFunc(s, func(s string) string { code := bigcodes[0] bigcodes = bigcodes[1:] return code }) s = re_bigcoder.ReplaceAllString(s, "

$1

") s = re_coder.ReplaceAllString(s, "$1") // some final fixups s = strings.Replace(s, "\n", "
", -1) s = strings.Replace(s, "

", "
", -1) s = strings.Replace(s, "
", "
", -1)
	s = strings.Replace(s, "


", "

", -1) return s } func linkreplacer(url string) string { if url[0:2] == "](" { return url } prefix := "" for !strings.HasPrefix(url, "http") { prefix += url[0:1] url = url[1:] } addparen := false adddot := false if strings.HasSuffix(url, ")") && strings.IndexByte(url, '(') == -1 { url = url[:len(url)-1] addparen = true } if strings.HasSuffix(url, ".") { url = url[:len(url)-1] adddot = true } url = fmt.Sprintf(`%s`, url, url) if adddot { url += "." } if addparen { url += ")" } return prefix + url }