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replace naive unicode support with system-dependent in collapse-whitespa... #5

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replace naive unicode support with system-dependent in collapse-whitespa... #5

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34 changes: 12 additions & 22 deletions src/nox/xml-util.lisp
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Original file line number Diff line number Diff line change
Expand Up @@ -416,30 +416,20 @@
char)))

(defun collapse-whitespace (string)
;; new version with "poor man's Unicode support" :-(
"Trims and replaces multiple whitespace char occurences with a
single Space. Relies on the platform's unicode support."

;; see also https://github.com/lisp/de.setf.wilbur/issues/4
(labels ((collapse (mode old new)
(if old
(dsb (c &rest old) old
(cond ((zerop (logand (char-code c) #b10000000))
(if (whitespace-char-p c)
(collapse (if (eq mode :start) :start :white) old new)
(collapse :collect old
(if (eq mode :white)
(list* c #\Space new)
(cons c new)))))
((= (logand (char-code c) #b11100000) 192)
(collapse :collect (cdr old)
(if (eq mode :white)
(list* (car old) c #\Space new)
(list* (car old) c new))))
((= (logand (char-code c) #b11110000) 224)
(collapse :collect (cddr old)
(if (eq mode :white)
(list* (cadr old) (car old) c #\Space new)
(list* (cadr old) (car old) c new))))
(t
(error "Cannot decode this: ~S" (cons c old)))))
(concatenate 'string (nreverse new)))))
(dsb (c &rest old) old
(if (whitespace-char-p c)
(collapse (if (eq mode :start) :start :white) old new)
(collapse :collect old
(if (eq mode :white)
(list* c #\Space new)
(cons c new)))))
(concatenate 'string (nreverse new)))))
(declare (dynamic-extent #'collapse))
(collapse :start (coerce string 'list) nil)))

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