I’m sure lots of people will think this, so I’ll say it—
Box-drawing characters (U+2500–U+257F) are not ASCII (U+0000–U+007F).
There, got it out of my system. :-)
(I know, “ASCII art” colloquially means more than just the ASCII range.)
Box-drawing characters (U+2500–U+257F) are not ASCII (U+0000–U+007F).
There, got it out of my system. :-)
(I know, “ASCII art” colloquially means more than just the ASCII range.)
I think the confusion arises because the IBM PC ASCII (code page 437) included comprehensive box-drawing characters between hexidecimal character positions B3 and DA. These weren't adopted into Unicode in the same character positions, but the box-drawing characters were definitely part of the commonly understood ASCII character set.
But I think that this ASCII tree editor should have a toggle option for basic vs extended ASCII, by utilising +, -, and | characters.
Honestly I’m not even convinced it’s entirely fair to call code page 437 a superset of ASCII, with how it repurposes the control codes 0x01–0x1F and 0x7F. (Superset of printable ASCII, definitely. It just feels not quite right to call it a superset of ASCII as a whole, though it is generally considered so.)
(And I can’t find any references to code page 437 being called “IBM PC ASCII”.)
I recall "ASCII art" always referring to art made with the 7-bit character set, and art made with the extended CP437 characters (and including color, etc.) always being called "ANSI art".