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S.P.L.U.R.T-Station-13/code/__HELPERS/text.dm
2020-01-31 05:32:00 +01:00

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/*
* Holds procs designed to help with filtering text
* Contains groups:
* SQL sanitization/formating
* Text sanitization
* Text searches
* Text modification
* Misc
*/
/*
* SQL sanitization
*/
// Run all strings to be used in an SQL query through this proc first to properly escape out injection attempts.
/proc/sanitizeSQL(t)
return SSdbcore.Quote("[t]")
/proc/format_table_name(table as text)
return CONFIG_GET(string/feedback_tableprefix) + table
/*
* Text sanitization
*/
//Simply removes < and > and limits the length of the message
/proc/strip_html_simple(t,limit=MAX_MESSAGE_LEN)
var/list/strip_chars = list("<",">")
t = copytext(t,1,limit)
for(var/char in strip_chars)
var/index = findtext(t, char)
while(index)
t = copytext(t, 1, index) + copytext(t, index+1)
index = findtext(t, char)
return t
//Removes a few problematic characters
/proc/sanitize_simple(t,list/repl_chars = list("\n"="#","\t"="#"))
for(var/char in repl_chars)
var/index = findtext(t, char)
while(index)
t = copytext(t, 1, index) + repl_chars[char] + copytext(t, index + length(char))
index = findtext(t, char, index + length(char))
return t
/proc/sanitize_filename(t)
return sanitize_simple(t, list("\n"="", "\t"="", "/"="", "\\"="", "?"="", "%"="", "*"="", ":"="", "|"="", "\""="", "<"="", ">"=""))
//Runs byond's sanitization proc along-side sanitize_simple
/proc/sanitize(t,list/repl_chars = null)
return html_encode(sanitize_simple(t,repl_chars))
//Runs sanitize and strip_html_simple
//I believe strip_html_simple() is required to run first to prevent '<' from displaying as '&lt;' after sanitize() calls byond's html_encode()
/proc/strip_html(t,limit=MAX_MESSAGE_LEN)
return copytext((sanitize(strip_html_simple(t))),1,limit)
//Runs byond's sanitization proc along-side strip_html_simple
//I believe strip_html_simple() is required to run first to prevent '<' from displaying as '&lt;' that html_encode() would cause
/proc/adminscrub(t,limit=MAX_MESSAGE_LEN)
return copytext((html_encode(strip_html_simple(t))),1,limit)
//Returns null if there is any bad text in the string
/proc/reject_bad_text(text, max_length = 512, ascii_only = TRUE)
var/char_count = 0
var/non_whitespace = FALSE
var/lenbytes = length(text)
var/char = ""
for(var/i = 1, i <= lenbytes, i += length(char))
char = text[i]
char_count++
if(char_count > max_length)
return
switch(text2ascii(char))
if(62,60,92,47) // <, >, \, /
return
if(0 to 31)
return
if(32)
continue //whitespace
if(127 to INFINITY)
if(ascii_only)
return
else
non_whitespace = TRUE
if(non_whitespace)
return text //only accepts the text if it has some non-spaces
// Used to get a properly sanitized input, of max_length
// no_trim is self explanatory but it prevents the input from being trimed if you intend to parse newlines or whitespace.
/proc/stripped_input(mob/user, message = "", title = "", default = "", max_length=MAX_MESSAGE_LEN, no_trim=FALSE)
var/name = input(user, message, title, default) as text|null
if(no_trim)
return copytext(html_encode(name), 1, max_length)
else
return trim(html_encode(name), max_length) //trim is "outside" because html_encode can expand single symbols into multiple symbols (such as turning < into &lt;)
// Used to get a properly sanitized multiline input, of max_length
/proc/stripped_multiline_input(mob/user, message = "", title = "", default = "", max_length=MAX_MESSAGE_LEN, no_trim=FALSE)
var/name = input(user, message, title, default) as message|null
if(isnull(name)) // Return null if canceled.
return null
if(no_trim)
return copytext(html_encode(name), 1, max_length)
else
return trim(html_encode(name), max_length)
#define NO_CHARS_DETECTED 0
#define SPACES_DETECTED 1
#define SYMBOLS_DETECTED 2
#define NUMBERS_DETECTED 3
#define LETTERS_DETECTED 4
//Filters out undesirable characters from names
/proc/reject_bad_name(t_in, allow_numbers = FALSE, max_length = MAX_NAME_LEN, ascii_only = TRUE)
if(!t_in)
return //Rejects the input if it is null
var/number_of_alphanumeric = 0
var/last_char_group = NO_CHARS_DETECTED
var/t_out = ""
var/t_len = length(t_in)
var/charcount = 0
var/char = ""
for(var/i = 1, i <= t_len, i += length(char))
char = t_in[i]
switch(text2ascii(char))
// A .. Z
if(65 to 90) //Uppercase Letters
number_of_alphanumeric++
last_char_group = LETTERS_DETECTED
// a .. z
if(97 to 122) //Lowercase Letters
if(last_char_group == NO_CHARS_DETECTED || last_char_group == SPACES_DETECTED || last_char_group == SYMBOLS_DETECTED) //start of a word
char = uppertext(char)
number_of_alphanumeric++
last_char_group = LETTERS_DETECTED
// 0 .. 9
if(48 to 57) //Numbers
if(last_char_group == NO_CHARS_DETECTED || !allow_numbers) //suppress at start of string
continue
number_of_alphanumeric++
last_char_group = NUMBERS_DETECTED
// ' - .
if(39,45,46) //Common name punctuation
if(last_char_group == NO_CHARS_DETECTED)
continue
last_char_group = SYMBOLS_DETECTED
// ~ | @ : # $ % & * +
if(126,124,64,58,35,36,37,38,42,43) //Other symbols that we'll allow (mainly for AI)
if(last_char_group == NO_CHARS_DETECTED || !allow_numbers) //suppress at start of string
continue
last_char_group = SYMBOLS_DETECTED
//Space
if(32)
if(last_char_group == NO_CHARS_DETECTED || last_char_group == SPACES_DETECTED) //suppress double-spaces and spaces at start of string
continue
last_char_group = SPACES_DETECTED
if(127 to INFINITY)
if(ascii_only)
continue
last_char_group = SYMBOLS_DETECTED //for now, we'll treat all non-ascii characters like symbols even though most are letters
else
continue
t_out += char
charcount++
if(charcount >= max_length)
break
if(number_of_alphanumeric < 2)
return //protects against tiny names like "A" and also names like "' ' ' ' ' ' ' '"
if(last_char_group == SPACES_DETECTED)
t_out = copytext_char(t_out, 1, -1) //removes the last character (in this case a space)
for(var/bad_name in list("space","floor","wall","r-wall","monkey","unknown","inactive ai")) //prevents these common metagamey names
if(cmptext(t_out,bad_name))
return //(not case sensitive)
return t_out
#undef NO_CHARS_DETECTED
#undef SPACES_DETECTED
#undef NUMBERS_DETECTED
#undef LETTERS_DETECTED
//html_encode helper proc that returns the smallest non null of two numbers
//or 0 if they're both null (needed because of findtext returning 0 when a value is not present)
/proc/non_zero_min(a, b)
if(!a)
return b
if(!b)
return a
return (a < b ? a : b)
//Checks if any of a given list of needles is in the haystack
/proc/text_in_list(haystack, list/needle_list, start=1, end=0)
for(var/needle in needle_list)
if(findtext(haystack, needle, start, end))
return 1
return 0
//Like above, but case sensitive
/proc/text_in_list_case(haystack, list/needle_list, start=1, end=0)
for(var/needle in needle_list)
if(findtextEx(haystack, needle, start, end))
return 1
return 0
//Adds 'char' ahead of 'text' until there are 'count' characters total
/proc/add_leading(text, count, char = " ")
text = "[text]"
var/charcount = count - length_char(text)
var/list/chars_to_add[max(charcount + 1, 0)]
return jointext(chars_to_add, char) + text
//Adds 'char' behind 'text' until there are 'count' characters total
/proc/add_trailing(text, count, char = " ")
text = "[text]"
var/charcount = count - length_char(text)
var/list/chars_to_add[max(charcount + 1, 0)]
return text + jointext(chars_to_add, char)
//Returns a string with reserved characters and spaces before the first letter removed
/proc/trim_left(text)
for (var/i = 1 to length(text))
if (text2ascii(text, i) > 32)
return copytext(text, i)
return ""
//Returns a string with reserved characters and spaces after the last letter removed
/proc/trim_right(text)
for (var/i = length(text), i > 0, i--)
if (text2ascii(text, i) > 32)
return copytext(text, 1, i + 1)
return ""
//Returns a string with reserved characters and spaces before the first word and after the last word removed.
/proc/trim(text, max_length)
if(max_length)
text = copytext_char(text, 1, max_length)
return trim_left(trim_right(text))
//Returns a string with the first element of the string capitalized.
/proc/capitalize(t as text)
. = t
if(t)
. = t[1]
return uppertext(.) + copytext(t, 1 + length(.))
/proc/stringmerge(text,compare,replace = "*")
//This proc fills in all spaces with the "replace" var (* by default) with whatever
//is in the other string at the same spot (assuming it is not a replace char).
//This is used for fingerprints
var/newtext = text
var/text_it = 1 //iterators
var/comp_it = 1
var/newtext_it = 1
var/text_length = length(text)
var/comp_length = length(compare)
while(comp_it <= comp_length && text_it <= text_length)
var/a = text[text_it]
var/b = compare[comp_it]
//if it isn't both the same letter, or if they are both the replacement character
//(no way to know what it was supposed to be)
if(a != b)
if(a == replace) //if A is the replacement char
newtext = copytext(newtext, 1, newtext_it) + b + copytext(newtext, newtext_it + length(newtext[newtext_it]))
else if(b == replace) //if B is the replacement char
newtext = copytext(newtext, 1, newtext_it) + a + copytext(newtext, newtext_it + length(newtext[newtext_it]))
else //The lists disagree, Uh-oh!
return 0
text_it += length(a)
comp_it += length(b)
newtext_it += length(newtext[newtext_it])
return newtext
/proc/stringpercent(text,character = "*")
//This proc returns the number of chars of the string that is the character
//This is used for detective work to determine fingerprint completion.
if(!text || !character)
return 0
var/count = 0
var/lentext = length(text)
var/a = ""
for(var/i = 1, i <= lentext, i += length(a))
a = text[i]
if(a == character)
count++
return count
/proc/reverse_text(text = "")
var/new_text = ""
var/lentext = length(text)
var/letter = ""
for(var/i = 1, i <= lentext, i += length(letter))
letter = text[i]
new_text = letter + new_text
return new_text
GLOBAL_LIST_INIT(zero_character_only, list("0"))
GLOBAL_LIST_INIT(hex_characters, list("0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f"))
GLOBAL_LIST_INIT(alphabet, list("a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z"))
GLOBAL_LIST_INIT(binary, list("0","1"))
/proc/random_string(length, list/characters)
. = ""
for(var/i=1, i<=length, i++)
. += pick(characters)
/proc/repeat_string(times, string="")
. = ""
for(var/i=1, i<=times, i++)
. += string
/proc/random_short_color()
return random_string(3, GLOB.hex_characters)
/proc/random_color()
return random_string(6, GLOB.hex_characters)
//merges non-null characters (3rd argument) from "from" into "into". Returns result
//e.g. into = "Hello World"
// from = "Seeya______"
// returns"Seeya World"
//The returned text is always the same length as into
//This was coded to handle DNA gene-splicing.
/proc/merge_text(into, from, null_char="_")
. = ""
if(!istext(into))
into = ""
if(!istext(from))
from = ""
var/null_ascii = istext(null_char) ? text2ascii(null_char, 1) : null_char
var/copying_into = FALSE
var/char = ""
var/start = 1
var/end_from = length(from)
var/end_into = length(into)
var/into_it = 1
var/from_it = 1
while(from_it <= end_from && into_it <= end_into)
char = from[from_it]
if(text2ascii(char) == null_ascii)
if(!copying_into)
. += copytext(from, start, from_it)
start = into_it
copying_into = TRUE
else
if(copying_into)
. += copytext(into, start, into_it)
start = from_it
copying_into = FALSE
into_it += length(into[into_it])
from_it += length(char)
if(copying_into)
. += copytext(into, start)
else
. += copytext(from, start, from_it)
if(into_it <= end_into)
. += copytext(into, into_it)
//finds the first occurrence of one of the characters from needles argument inside haystack
//it may appear this can be optimised, but it really can't. findtext() is so much faster than anything you can do in byondcode.
//stupid byond :(
/proc/findchar(haystack, needles, start=1, end=0)
var/char = ""
var/len = length(needles)
for(var/i = 1, i <= len, i += length(char))
char = needles[i]
. = findtextEx(haystack, char, start, end)
if(.)
return
return 0
/proc/parsemarkdown_basic_step1(t, limited=FALSE)
if(length(t) <= 0)
return
// This parses markdown with no custom rules
// Escape backslashed
t = replacetext(t, "$", "$-")
t = replacetext(t, "\\\\", "$1")
t = replacetext(t, "\\**", "$2")
t = replacetext(t, "\\*", "$3")
t = replacetext(t, "\\__", "$4")
t = replacetext(t, "\\_", "$5")
t = replacetext(t, "\\^", "$6")
t = replacetext(t, "\\((", "$7")
t = replacetext(t, "\\))", "$8")
t = replacetext(t, "\\|", "$9")
t = replacetext(t, "\\%", "$0")
// Escape single characters that will be used
t = replacetext(t, "!", "$a")
// Parse hr and small
if(!limited)
t = replacetext(t, "((", "<font size=\"1\">")
t = replacetext(t, "))", "</font>")
t = replacetext(t, regex("(-){3,}", "gm"), "<hr>")
t = replacetext(t, regex("^\\((-){3,}\\)$", "gm"), "$1")
// Parse lists
var/list/tlist = splittext(t, "\n")
var/tlistlen = tlist.len
var/listlevel = -1
var/singlespace = -1 // if 0, double spaces are used before asterisks, if 1, single are
for(var/i = 1, i <= tlistlen, i++)
var/line = tlist[i]
var/count_asterisk = length(replacetext(line, regex("\[^\\*\]+", "g"), ""))
if(count_asterisk % 2 == 1 && findtext(line, regex("^\\s*\\*", "g"))) // there is an extra asterisk in the beggining
var/count_w = length(replacetext(line, regex("^( *)\\*.*$", "g"), "$1")) // whitespace before asterisk
line = replacetext(line, regex("^ *(\\*.*)$", "g"), "$1")
if(singlespace == -1 && count_w == 2)
if(listlevel == 0)
singlespace = 0
else
singlespace = 1
if(singlespace == 0)
count_w = count_w % 2 ? round(count_w / 2 + 0.25) : count_w / 2
line = replacetext(line, regex("\\*", ""), "<li>")
while(listlevel < count_w)
line = "<ul>" + line
listlevel++
while(listlevel > count_w)
line = "</ul>" + line
listlevel--
else while(listlevel >= 0)
line = "</ul>" + line
listlevel--
tlist[i] = line
// end for
t = tlist[1]
for(var/i = 2, i <= tlistlen, i++)
t += "\n" + tlist[i]
while(listlevel >= 0)
t += "</ul>"
listlevel--
else
t = replacetext(t, "((", "")
t = replacetext(t, "))", "")
// Parse headers
t = replacetext(t, regex("^#(?!#) ?(.+)$", "gm"), "<h2>$1</h2>")
t = replacetext(t, regex("^##(?!#) ?(.+)$", "gm"), "<h3>$1</h3>")
t = replacetext(t, regex("^###(?!#) ?(.+)$", "gm"), "<h4>$1</h4>")
t = replacetext(t, regex("^#### ?(.+)$", "gm"), "<h5>$1</h5>")
// Parse most rules
t = replacetext(t, regex("\\*(\[^\\*\]*)\\*", "g"), "<i>$1</i>")
t = replacetext(t, regex("_(\[^_\]*)_", "g"), "<i>$1</i>")
t = replacetext(t, "<i></i>", "!")
t = replacetext(t, "</i><i>", "!")
t = replacetext(t, regex("\\!(\[^\\!\]+)\\!", "g"), "<b>$1</b>")
t = replacetext(t, regex("\\^(\[^\\^\]+)\\^", "g"), "<font size=\"4\">$1</font>")
t = replacetext(t, regex("\\|(\[^\\|\]+)\\|", "g"), "<center>$1</center>")
t = replacetext(t, "!", "</i><i>")
return t
/proc/parsemarkdown_basic_step2(t)
if(length(t) <= 0)
return
// Restore the single characters used
t = replacetext(t, "$a", "!")
// Redo the escaping
t = replacetext(t, "$1", "\\")
t = replacetext(t, "$2", "**")
t = replacetext(t, "$3", "*")
t = replacetext(t, "$4", "__")
t = replacetext(t, "$5", "_")
t = replacetext(t, "$6", "^")
t = replacetext(t, "$7", "((")
t = replacetext(t, "$8", "))")
t = replacetext(t, "$9", "|")
t = replacetext(t, "$0", "%")
t = replacetext(t, "$-", "$")
return t
/proc/parsemarkdown_basic(t, limited=FALSE)
t = parsemarkdown_basic_step1(t, limited)
t = parsemarkdown_basic_step2(t)
return t
/proc/parsemarkdown(t, mob/user=null, limited=FALSE)
if(length(t) <= 0)
return
// Premanage whitespace
t = replacetext(t, regex("\[^\\S\\r\\n \]", "g"), " ")
t = parsemarkdown_basic_step1(t)
t = replacetext(t, regex("%s(?:ign)?(?=\\s|$)", "igm"), user ? "<font face=\"[SIGNFONT]\"><i>[user.real_name]</i></font>" : "<span class=\"paper_field\"></span>")
t = replacetext(t, regex("%f(?:ield)?(?=\\s|$)", "igm"), "<span class=\"paper_field\"></span>")
t = parsemarkdown_basic_step2(t)
// Manage whitespace
t = replacetext(t, regex("(?:\\r\\n?|\\n)", "g"), "<br>")
t = replacetext(t, " ", "&nbsp;&nbsp;")
// Done
return t
/proc/text2charlist(text)
var/char = ""
var/lentext = length(text)
. = list()
for(var/i = 1, i <= lentext, i += length(char))
char = text[i]
. += char
/proc/rot13(text = "")
var/lentext = length(text)
var/char = ""
var/ascii = 0
. = ""
for(var/i = 1, i <= lentext, i += length(char))
char = text[i]
ascii = text2ascii(char)
switch(ascii)
if(65 to 77, 97 to 109) //A to M, a to m
ascii += 13
if(78 to 90, 110 to 122) //N to Z, n to z
ascii -= 13
. += ascii2text(ascii)
//Takes a list of values, sanitizes it down for readability and character count,
//then exports it as a json file at data/npc_saves/[filename].json.
//As far as SS13 is concerned this is write only data. You can't change something
//in the json file and have it be reflected in the in game item/mob it came from.
//(That's what things like savefiles are for) Note that this list is not shuffled.
/proc/twitterize(list/proposed, filename, cullshort = 1, storemax = 1000)
if(!islist(proposed) || !filename || !CONFIG_GET(flag/log_twitter))
return
//Regular expressions are, as usual, absolute magic
//Any characters outside of 32 (space) to 126 (~) because treating things you don't understand as "magic" is really stupid
var/regex/all_invalid_symbols = new(@"[^ -~]{1}")
var/list/accepted = list()
for(var/string in proposed)
if(findtext(string,GLOB.is_website) || findtext(string,GLOB.is_email) || findtext(string,all_invalid_symbols) || !findtext(string,GLOB.is_alphanumeric))
continue
var/buffer = ""
var/early_culling = TRUE
var/lentext = length(string)
var/let = ""
for(var/pos = 1, pos <= lentext, pos += length(let))
let = string[pos]
if(!findtext(let, GLOB.is_alphanumeric))
continue
early_culling = FALSE
buffer = copytext(string, pos)
break
if(early_culling) //Never found any letters! Bail!
continue
var/punctbuffer = ""
var/cutoff = 0
lentext = length_char(buffer)
for(var/pos = 1, pos <= lentext, pos++)
let = copytext_char(buffer, -pos, -pos + 1)
if(!findtext(let, GLOB.is_punctuation)) //This won't handle things like Nyaaaa!~ but that's fine
break
punctbuffer += let
cutoff += length(let)
if(punctbuffer) //We clip down excessive punctuation to get the letter count lower and reduce repeats. It's not perfect but it helps.
var/exclaim = FALSE
var/question = FALSE
var/periods = 0
lentext = length(punctbuffer)
for(var/pos = 1, pos <= lentext, pos += length(let))
let = punctbuffer[pos]
if(!exclaim && findtext(let, "!"))
exclaim = TRUE
if(question)
break
if(!question && findtext(let, "?"))
question = TRUE
if(exclaim)
break
if(!exclaim && !question && findtext(let, ".")) //? and ! take priority over periods
periods += 1
if(exclaim)
if(question)
punctbuffer = "?!"
else
punctbuffer = "!"
else if(question)
punctbuffer = "?"
else if(periods > 1)
punctbuffer = "..."
else
punctbuffer = "" //Grammer nazis be damned
buffer = copytext(buffer, 1, -cutoff) + punctbuffer
lentext = length_char(buffer)
if(!buffer || lentext > 280 || lentext <= cullshort || (buffer in accepted))
continue
accepted += buffer
var/log = file("data/npc_saves/[filename].json") //If this line ever shows up as changed in a PR be very careful you aren't being memed on
var/list/oldjson = list()
var/list/oldentries = list()
if(fexists(log))
oldjson = json_decode(file2text(log))
oldentries = oldjson["data"]
if(!isemptylist(oldentries))
for(var/string in accepted)
for(var/old in oldentries)
if(string == old)
oldentries.Remove(old) //Line's position in line is "refreshed" until it falls off the in game radar
break
var/list/finalized = list()
finalized = accepted.Copy() + oldentries.Copy() //we keep old and unreferenced phrases near the bottom for culling
listclearnulls(finalized)
if(!isemptylist(finalized) && length(finalized) > storemax)
finalized.Cut(storemax + 1)
fdel(log)
var/list/tosend = list()
tosend["data"] = finalized
WRITE_FILE(log, json_encode(tosend))
//Used for applying byonds text macros to strings that are loaded at runtime
/proc/apply_text_macros(string)
var/next_backslash = findtext(string, "\\")
if(!next_backslash)
return string
var/leng = length(string)
var/next_space = findtext(string, " ", next_backslash + length(string[next_backslash]))
if(!next_space)
next_space = leng - next_backslash
if(!next_space) //trailing bs
return string
var/base = next_backslash == 1 ? "" : copytext(string, 1, next_backslash)
var/macro = lowertext(copytext(string, next_backslash + length(string[next_space]), next_space))
var/rest = next_backslash > leng ? "" : copytext(string, next_space + length(string[next_space]))
//See https://secure.byond.com/docs/ref/info.html#/DM/text/macros
switch(macro)
//prefixes/agnostic
if("the")
rest = text("\the []", rest)
if("a")
rest = text("\a []", rest)
if("an")
rest = text("\an []", rest)
if("proper")
rest = text("\proper []", rest)
if("improper")
rest = text("\improper []", rest)
if("roman")
rest = text("\roman []", rest)
//postfixes
if("th")
base = text("[]\th", rest)
if("s")
base = text("[]\s", rest)
if("he")
base = text("[]\he", rest)
if("she")
base = text("[]\she", rest)
if("his")
base = text("[]\his", rest)
if("himself")
base = text("[]\himself", rest)
if("herself")
base = text("[]\herself", rest)
if("hers")
base = text("[]\hers", rest)
. = base
if(rest)
. += .(rest)
//Replacement for the \th macro when you want the whole word output as text (first instead of 1st)
/proc/thtotext(number)
if(!isnum(number))
return
switch(number)
if(1)
return "first"
if(2)
return "second"
if(3)
return "third"
if(4)
return "fourth"
if(5)
return "fifth"
if(6)
return "sixth"
if(7)
return "seventh"
if(8)
return "eighth"
if(9)
return "ninth"
if(10)
return "tenth"
if(11)
return "eleventh"
if(12)
return "twelfth"
else
return "[number]\th"
/proc/unintelligize(message)
var/regex/word_boundaries = regex(@"\b[\S]+\b", "g")
var/prefix = message[1]
if(prefix == ";")
message = copytext(message, 1 + length(prefix))
else if(prefix in list(":", "#"))
prefix += message[1 + length(prefix)]
message = copytext(message, length(prefix))
else
prefix = ""
var/list/rearranged = list()
while(word_boundaries.Find(message))
var/cword = word_boundaries.match
if(length(cword))
rearranged += cword
shuffle_inplace(rearranged)
return "[prefix][jointext(rearranged, " ")]"
#define is_alpha(X) ((text2ascii(X) <= 122) && (text2ascii(X) >= 97))
#define is_digit(X) ((length(X) == 1) && (length(text2num(X)) == 1))