1//
  2// Copyright (c) 2019 Ted Unangst <tedu@tedunangst.com>
  3//
  4// Permission to use, copy, modify, and distribute this software for any
  5// purpose with or without fee is hereby granted, provided that the above
  6// copyright notice and this permission notice appear in all copies.
  7//
  8// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  9// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 10// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 11// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 12// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 13// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 14// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 15
 16package main
 17
 18import (
 19	"regexp"
 20
 21	"github.com/mattn/go-runewidth"
 22)
 23
 24var bigboldshitz = "𝐀𝐁𝐂𝐃𝐄𝐅𝐆𝐇𝐈𝐉𝐊𝐋𝐌𝐍𝐎𝐏𝐐𝐑𝐒𝐓𝐔𝐕𝐖𝐗𝐘𝐙"
 25var lilboldshitz = "𝐚𝐛𝐜𝐝𝐞𝐟𝐠𝐡𝐢𝐣𝐤𝐥𝐦𝐧𝐨𝐩𝐪𝐫𝐬𝐭𝐮𝐯𝐰𝐱𝐲𝐳"
 26var biggothshitz = "𝕬𝕭𝕮𝕯𝕰𝕱𝕲𝕳𝕴𝕵𝕶𝕷𝕸𝕹𝕺𝕻𝕼𝕽𝕾𝕿𝖀𝖁𝖂𝖃𝖄𝖅"
 27var lilgothshitz = "𝖆𝖇𝖈𝖉𝖊𝖋𝖌𝖍𝖎𝖏𝖐𝖑𝖒𝖓𝖔𝖕𝖖𝖗𝖘𝖙𝖚𝖛𝖜𝖝𝖞𝖟"
 28var moegothshitz = "𝔄𝔅𝕮𝔇𝔈𝔉𝔊𝕳ℑ𝔍𝔎𝔏𝔐𝔑𝔒𝔓𝔔ℜ𝔖𝔗𝔘𝔙𝔚𝔛𝔜𝖅"
 29var morgothshitz = "𝔞𝔟𝔠𝔡𝔢𝔣𝔤𝔥𝔦𝔧𝔨𝔩𝔪𝔫𝔬𝔭𝔮𝔯𝔰𝔱𝔲𝔳𝔴𝔵𝔶𝔷"
 30var bigitalshitz = "𝑨𝑩𝑪𝑫𝑬𝑭𝑮𝑯𝑰𝑱𝑲𝑳𝑴𝑵𝑶𝑷𝑸𝑹𝑺𝑻𝑼𝑽𝑾𝑿𝒀𝒁"
 31var lilitalshitz = "𝒂𝒃𝒄𝒅𝒆𝒇𝒈𝒉𝒊𝒋𝒌𝒍𝒎𝒏𝒐𝒑𝒒𝒓𝒔𝒕𝒖𝒗𝒘𝒙𝒚𝒛"
 32var bigbangshitz = "𝔸𝔹ℂ𝔻𝔼𝔽𝔾ℍ𝕀𝕁𝕂𝕃𝕄ℕ𝕆ℙℚℝ𝕊𝕋𝕌𝕍𝕎𝕏𝕐ℤ"
 33var lilbangshitz = "𝕒𝕓𝕔𝕕𝕖𝕗𝕘𝕙𝕚𝕛𝕜𝕝𝕞𝕟𝕠𝕡𝕢𝕣𝕤𝕥𝕦𝕧𝕨𝕩𝕪𝕫"
 34var bigblokshitz = "🅰🅱🅲🅳🅴🅵🅶🅷🅸🅹🅺🅻🅼🅽🅾🅿🆀🆁🆂🆃🆄🆅🆆🆇🆈🆉"
 35
 36var re_alltheshitz = regexp.MustCompile(`([` +
 37	bigboldshitz + lilboldshitz +
 38	biggothshitz + lilgothshitz +
 39	moegothshitz + morgothshitz +
 40	bigitalshitz + lilitalshitz +
 41	bigbangshitz + lilbangshitz +
 42	bigblokshitz +
 43	"][ '\ufe0f]?){3,}")
 44
 45// this may not be especially fast
 46func unpucker(s string) string {
 47	fixer := func(r string) string {
 48		x := make([]byte, len(r))
 49		xi := 0
 50	loop1:
 51		for _, c := range r {
 52			xi++
 53			if c == ' ' || c == '\'' {
 54				x[xi] = byte(c)
 55				continue
 56			}
 57			for _, set := range []string{bigboldshitz, biggothshitz, moegothshitz, bigitalshitz, bigbangshitz, bigblokshitz} {
 58				i := 0
 59				for _, rr := range set {
 60					if rr == c {
 61						x[xi] = byte('A' + i)
 62						continue loop1
 63					}
 64					i++
 65				}
 66			}
 67			for _, set := range []string{lilboldshitz, lilgothshitz, morgothshitz, lilitalshitz, lilbangshitz} {
 68				i := 0
 69				for _, rr := range set {
 70					if rr == c {
 71						x[xi] = byte('a' + i)
 72						continue loop1
 73					}
 74					i++
 75				}
 76			}
 77			x[xi] = '.'
 78		}
 79		return string(x)
 80	}
 81	s = re_alltheshitz.ReplaceAllStringFunc(s, fixer)
 82
 83	zw := false
 84	for _, c := range s {
 85		if runewidth.RuneWidth(c) == 0 {
 86			zw = true
 87			break
 88		}
 89	}
 90	if zw {
 91		x := make([]byte, 0, len(s))
 92		zw = false
 93		for _, c := range s {
 94			if runewidth.RuneWidth(c) == 0 {
 95				if zw {
 96					continue
 97				}
 98				zw = true
 99			} else {
100				zw = false
101			}
102			q := string(c)
103			x = append(x, []byte(q)...)
104		}
105		return string(x)
106	}
107	return s
108}