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 bigitalshitz = "𝑨𝑩𝑪𝑫𝑬𝑭𝑮𝑯𝑰𝑱𝑲𝑳𝑴𝑵𝑶𝑷𝑸𝑹𝑺𝑻𝑼𝑽𝑾𝑿𝒀𝒁"
29var lilitalshitz = "𝒂𝒃𝒄𝒅𝒆𝒇𝒈𝒉𝒊𝒋𝒌𝒍𝒎𝒏𝒐𝒑𝒒𝒓𝒔𝒕𝒖𝒗𝒘𝒙𝒚𝒛"
30var bigbangshitz = "𝔸𝔹ℂ𝔻𝔼𝔽𝔾ℍ𝕀𝕁𝕂𝕃𝕄ℕ𝕆ℙℚℝ𝕊𝕋𝕌𝕍𝕎𝕏𝕐ℤ"
31var lilbangshitz = "𝕒𝕓𝕔𝕕𝕖𝕗𝕘𝕙𝕚𝕛𝕜𝕝𝕞𝕟𝕠𝕡𝕢𝕣𝕤𝕥𝕦𝕧𝕨𝕩𝕪𝕫"
32
33var re_alltheshitz = regexp.MustCompile(`[` +
34	bigboldshitz + lilboldshitz +
35	biggothshitz + lilgothshitz +
36	bigitalshitz + lilitalshitz +
37	bigbangshitz + lilbangshitz +
38	`]{2,}`)
39
40// this may not be especially fast
41func unpucker(s string) string {
42	fixer := func(r string) string {
43		x := make([]byte, len(r))
44		xi := 0
45	loop1:
46		for _, c := range r {
47			xi++
48			for _, set := range []string{bigboldshitz, biggothshitz, bigitalshitz, bigbangshitz} {
49				i := 0
50				for _, rr := range set {
51					if rr == c {
52						x[xi] = byte('A' + i)
53						continue loop1
54					}
55					i++
56				}
57			}
58			for _, set := range []string{lilboldshitz, lilgothshitz, lilitalshitz, lilbangshitz} {
59				i := 0
60				for _, rr := range set {
61					if rr == c {
62						x[xi] = byte('a' + i)
63						continue loop1
64					}
65					i++
66				}
67			}
68			x[xi] = '.'
69		}
70		return string(x)
71	}
72	s = re_alltheshitz.ReplaceAllStringFunc(s, fixer)
73
74	zw := false
75	for _, c := range s {
76		if runewidth.RuneWidth(c) == 0 {
77			zw = true
78			break
79		}
80	}
81	if zw {
82		x := make([]byte, 0, len(s))
83		zw = false
84		for _, c := range s {
85			if runewidth.RuneWidth(c) == 0 {
86				if zw {
87					continue
88				}
89				zw = true
90			} else {
91				zw = false
92			}
93			q := string(c)
94			x = append(x, []byte(q)...)
95		}
96		return string(x)
97	}
98	return s
99}