a faster version of markitzero, though i'm uncertain it's worth it
This commit is contained in:
Ted Unangst
parent
beaceaadb1
commit
95dfba8d14
165
markitzero.go
165
markitzero.go
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@ -16,11 +16,11 @@
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package main
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import (
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"bytes"
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"fmt"
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"regexp"
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"strings"
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"golang.org/x/net/html"
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"humungus.tedunangst.com/r/webs/synlight"
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)
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@ -37,27 +37,8 @@ var re_lister = regexp.MustCompile(`((^|\n)(\+|-).*)+\n?`)
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var lighter = synlight.New(synlight.Options{Format: synlight.HTML})
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func markitzero(s string) string {
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// prepare the string
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s = strings.TrimSpace(s)
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s = strings.Replace(s, "\r", "", -1)
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// save away the code blocks so we don't mess them up further
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var bigcodes, lilcodes, images []string
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s = re_bigcoder.ReplaceAllStringFunc(s, func(code string) string {
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bigcodes = append(bigcodes, code)
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return "``````"
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})
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s = re_coder.ReplaceAllStringFunc(s, func(code string) string {
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lilcodes = append(lilcodes, code)
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return "`x`"
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})
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s = re_imgfix.ReplaceAllStringFunc(s, func(img string) string {
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images = append(images, img)
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return "<img x>"
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})
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// fewer side effects than html.EscapeString
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// fewer side effects than html.EscapeString
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func fasterescaper(s []byte) []byte {
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buf := make([]byte, 0, len(s))
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for _, c := range []byte(s) {
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switch c {
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@ -71,64 +52,130 @@ func markitzero(s string) string {
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buf = append(buf, c)
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}
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}
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s = string(buf)
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return buf
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}
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// mark it zero
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s = re_link.ReplaceAllStringFunc(s, linkreplacer)
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s = re_zerolink.ReplaceAllString(s, `<a href="$2">$1</a>`)
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s = re_bolder.ReplaceAllString(s, "$1<b>$2</b>$3")
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s = re_italicer.ReplaceAllString(s, "$1<i>$2</i>$3")
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s = re_quoter.ReplaceAllString(s, "<blockquote>$1<br><cite>$3</cite></blockquote><p>")
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s = re_reciter.ReplaceAllString(s, "$1$2$3")
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s = strings.Replace(s, "\n---\n", "<hr><p>", -1)
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s = re_lister.ReplaceAllStringFunc(s, func(m string) string {
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m = strings.Trim(m, "\n")
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items := strings.Split(m, "\n")
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r := "<ul>"
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for _, item := range items {
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r += "<li>" + strings.Trim(item[1:], " ")
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func replaceifmatch(re *regexp.Regexp, input []byte, repl []byte) []byte {
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if !re.Match(input) {
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return input
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}
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r += "</ul><p>"
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return r
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return re.ReplaceAll(input, repl)
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}
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func replaceifmatchfn(re *regexp.Regexp, input []byte, repl func([]byte) []byte) []byte {
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if !re.Match(input) {
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return input
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}
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return re.ReplaceAllFunc(input, repl)
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}
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func replacenocopy(input []byte, pat []byte, repl []byte) []byte {
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if !bytes.Contains(input, pat) {
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return input
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}
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return bytes.Replace(input, pat, repl, -1)
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}
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func markitzero(ss string) string {
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s := []byte(ss)
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// prepare the string
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s = bytes.TrimSpace(s)
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s = replacenocopy(s, []byte("\r"), []byte(""))
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hascode := bytes.Contains(s, []byte("`"))
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// save away the code blocks so we don't mess them up further
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var bigcodes, lilcodes, images [][]byte
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if hascode {
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s = replaceifmatchfn(re_bigcoder, s, func(code []byte) []byte {
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bigcodes = append(bigcodes, code)
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return []byte("``````")
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})
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s = replaceifmatchfn(re_coder, s, func(code []byte) []byte {
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lilcodes = append(lilcodes, code)
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return []byte("`x`")
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})
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}
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s = replaceifmatchfn(re_imgfix, s, func(img []byte) []byte {
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images = append(images, img)
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return []byte("<img x>")
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})
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s = fasterescaper(s)
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// mark it zero
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if bytes.Contains(s, []byte("http")) {
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s = replaceifmatchfn(re_link, s, linkreplacer)
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}
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s = replaceifmatch(re_zerolink, s, []byte(`<a href="$2">$1</a>`))
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if bytes.Contains(s, []byte("**")) {
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s = replaceifmatch(re_bolder, s, []byte("$1<b>$2</b>$3"))
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}
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if bytes.Contains(s, []byte("*")) {
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s = replaceifmatch(re_italicer, s, []byte("$1<i>$2</i>$3"))
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}
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if bytes.Contains(s, []byte("> ")) {
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s = replaceifmatch(re_quoter, s, []byte("<blockquote>$1<br><cite>$3</cite></blockquote><p>"))
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s = replaceifmatch(re_reciter, s, []byte("$1$2$3"))
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}
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s = replacenocopy(s, []byte("\n---\n"), []byte("<hr><p>"))
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if bytes.Contains(s, []byte("\n+")) || bytes.Contains(s, []byte("\n-")) {
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s = replaceifmatchfn(re_lister, s, func(m []byte) []byte {
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m = bytes.Trim(m, "\n")
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items := bytes.Split(m, []byte("\n"))
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r := []byte("<ul>")
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for _, item := range items {
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r = append(r, []byte("<li>")...)
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r = append(r, bytes.Trim(item[1:], " ")...)
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}
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r = append(r, []byte("</ul><p>")...)
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return r
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})
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}
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// restore images
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s = strings.Replace(s, "<img x>", "<img x>", -1)
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s = re_imgfix.ReplaceAllStringFunc(s, func(string) string {
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s = replacenocopy(s, []byte("<img x>"), []byte("<img x>"))
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s = replaceifmatchfn(re_imgfix, s, func([]byte) []byte {
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img := images[0]
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images = images[1:]
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return img
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})
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// now restore the code blocks
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s = re_coder.ReplaceAllStringFunc(s, func(string) string {
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if hascode {
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s = replaceifmatchfn(re_coder, s, func([]byte) []byte {
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code := lilcodes[0]
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lilcodes = lilcodes[1:]
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code = html.EscapeString(code)
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return code
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return fasterescaper(code)
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})
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s = re_bigcoder.ReplaceAllStringFunc(s, func(string) string {
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s = replaceifmatchfn(re_bigcoder, s, func([]byte) []byte {
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code := bigcodes[0]
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bigcodes = bigcodes[1:]
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m := re_bigcoder.FindStringSubmatch(code)
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return "<pre><code>" + lighter.HighlightString(m[2], m[1]) + "</code></pre><p>"
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m := re_bigcoder.FindSubmatch(code)
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var buf bytes.Buffer
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buf.WriteString("<pre><code>")
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lighter.Highlight(m[2], string(m[1]), &buf)
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buf.WriteString("</code></pre><p>")
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return buf.Bytes()
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})
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s = re_coder.ReplaceAllString(s, "<code>$1</code>")
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s = replaceifmatch(re_coder, s, []byte("<code>$1</code>"))
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}
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// some final fixups
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s = strings.Replace(s, "\n", "<br>", -1)
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s = strings.Replace(s, "<br><blockquote>", "<blockquote>", -1)
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s = strings.Replace(s, "<br><cite></cite>", "", -1)
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s = strings.Replace(s, "<br><pre>", "<pre>", -1)
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s = strings.Replace(s, "<br><ul>", "<ul>", -1)
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s = strings.Replace(s, "<p><br>", "<p>", -1)
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return s
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s = replacenocopy(s, []byte("\n"), []byte("<br>"))
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s = replacenocopy(s, []byte("<br><blockquote>"), []byte("<blockquote>"))
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s = replacenocopy(s, []byte("<br><cite></cite>"), []byte(""))
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s = replacenocopy(s, []byte("<br><pre>"), []byte("<pre>"))
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s = replacenocopy(s, []byte("<br><ul>"), []byte("<ul>"))
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s = replacenocopy(s, []byte("<p><br>"), []byte("<p>"))
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return string(s)
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}
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func linkreplacer(url string) string {
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func linkreplacer(burl []byte) []byte {
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url := string(burl)
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if url[0:2] == "](" {
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return url
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return burl
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}
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prefix := ""
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for !strings.HasPrefix(url, "http") {
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@ -152,5 +199,5 @@ func linkreplacer(url string) string {
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if addparen {
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url += ")"
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}
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return prefix + url
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return []byte(prefix + url)
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}
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