Visible - Maple Help

StringTools

 Visible
 render unprintable characters in a string visible

 Calling Sequence Visible( s )

Parameters

 s - string; Maple string

Description

 • The Visible(s) command returns a string in which unprintable characters are represented by escaped character codes. This allows you to see the byte values comprising the string when they would be otherwise unprintable. The byte values to be escaped are those determined not printable by the StringTools[IsPrintable] procedure.
 • Important: The transformation applied by Visible is not reversible.
 • All of the StringTools package commands treat strings as (null-terminated) sequences of $8$-bit (ASCII) characters.  Thus, there is no support for multibyte character encodings, such as unicode encodings.

Examples

 > $\mathrm{with}\left(\mathrm{StringTools}\right):$
 > Visible( Remove( IsPrintable, Iota( 1 .. 255 ) ) );
 ${"\1\2\3\4\5\6\7\8\9\10\11\12\13\14\15\16\17\18\19\20\21\22\23\24\25\26\27\28\29\30\31\127\128\129\130\131\132\133\134\135\136\137\138\139\140\141\142\143\144\145\146\147\148\149\150\151\152\153\154\155\156\157\158\159\160\161\162\163\164\165\166\167\168\169\170\171\172\173\174\175\176\177\178\179\180\181\182\183\184\185\186\187\188\189\190\191\192\193\194\195\196\197\198\199\200\201\202\203\204\205\206\207\208\209\210\211\212\213\214\215\216\217\218\219\220\221\222\223\224\225\226\227\228\229\230\231\232\233\234\235\236\237\238\239\240\241\242\243\244\245\246\247\248\249\250\251\252\253\254\255"}$ (1)
 > Visible( Select( IsPrintable, Iota( 1 .. 255 ) ) );
 ${"!"#%\text{'}\left(\right)*+,-./0123456789:<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ\left[\\right]^_`abcdefghijklmnopqrstuvwxyz\left\{|\right\}~"}$ (2)
 > $\mathrm{Visible}\left("2"\right)$
 ${"2"}$ (3)
 > $\mathrm{Visible}\left(\mathrm{Char}\left(2\right)\right)$
 ${"\2"}$ (4)
 > s := Visible( Iota( 1 .. 10 ) );
 ${s}{≔}{"\1\2\3\4\5\6\7\8\9\10"}$ (5)
 > $\mathrm{Visible}\left(s\right)$
 ${"\1\2\3\4\5\6\7\8\9\10"}$ (6)