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ruricolist / serapeum

Utilities beyond Alexandria
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Complete full definition for whitespacep? #68

Closed minghu6 closed 4 years ago

minghu6 commented 4 years ago

AKA, code 0-31 are invisible char of ASCII alphabet, however not all of them are included in whitespacep which is against intuition especially the \Nul isn't considerred whitespace.

So, maybe extending whitespacep to cover all char whose code from 0 below 32 are more reasonable for whitespace ?

minghu6 commented 4 years ago

For example:

 (defun whitespacep (c)
 (let ((code (char-code c)))
   (or
     (= code 160)
     (<= 0 code 32))))
ruricolist commented 4 years ago

Have you looked at cl:graphic-char-p?

minghu6 commented 4 years ago

Wow, There is some ambiguous on concept for me. In strict, according to wiki, computer science called only both not corresponds to visible mark and did occupy an area on page char as whitespace. And in common case, people called zero length string or string only contains whitespace as blank line.

Although string only contains \Nul looks like a zero length string. I have ever seemed every invisible char(in ascii scope)) and strict-whitespace as whitespace, that's my fault. (non-graphic-but-space in short ?)

Anyway thanks your help!