markitzero.go (view raw)
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//
// Copyright (c) 2019 Ted Unangst <tedu@tedunangst.com>
//
// 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?)`)
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<b>$2</b>$3")
s = re_italicer.ReplaceAllString(s, "$1<i>$2</i>$3")
s = re_quoter.ReplaceAllString(s, "<blockquote>$1</blockquote><p>")
s = re_link.ReplaceAllStringFunc(s, linkreplacer)
// 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, "<pre><code>$1</code></pre><p>")
s = re_coder.ReplaceAllString(s, "<code>$1</code>")
// some final fixups
s = strings.Replace(s, "\n", "<br>", -1)
s = strings.Replace(s, "<br><blockquote>", "<blockquote>", -1)
s = strings.Replace(s, "<br><pre>", "<pre>", -1)
s = strings.Replace(s, "<p><br>", "<p>", -1)
return s
}
func linkreplacer(url string) string {
if url[0] == '@' {
return url
}
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(`<a class="mention u-url" href="%s">%s</a>`, url, url)
if adddot {
url += "."
}
if addparen {
url += ")"
}
return url
}
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