Madhu wrote:
* Tamas Papp <87hcnwaky1.fsf@pu100877.student.princeton.edu> :
| Hi,
|
| I would like to parse color names in X11's rgb.txt. They look like this:
|
| 119 136 153 light slate gray
| 119 136 153 LightSlateGray
|
| When parsing each line, I would like to get the color triplet, and the
| name. I tried it like this:
|
| (let ((color-scanner
| (cl-ppcre:create-scanner
| "^ +([0-9]{0,2}) +([0-9]{0,2}) +([0-9]{0,2}) +([ a-zA-Z0-9]+)")))
| (cl-ppcre:scan-to-strings color-scanner " 1 2 3 foo bar baz "))
|
| This gives #("1" "2" "3" "foo bar baz ") for the substrings. How can
| I get rid of the trailing spaces?
Use the right tool for the job :)
(defun parse-rgb-line (string &key (start 0) end)
(multiple-value-bind (r endr)
(parse-integer string :start start :end end :junk-allowed t)
(multiple-value-bind (g endg)
(parse-integer string :start (1+ endr) :end end :junk-allowed t)
(multiple-value-bind (b endb)
(parse-integer string :start (1+ endg) :end end :junk-allowed t)
(let ((name-startpos
(position-if-not (lambda (c) (case c ((#\Tab #\Space) t)))
string :start (1+ endb))))
(values (format nil "#~2,'0X~2,'0X~2,'0X" r g b)
(subseq string name-startpos end)))))))
Testing under SBCL:
* (parse-rgb-line " 62 128 255 light blue ")
"#3E80FF"
"light blue "
Pure crap.
Gauche Scheme:
(use gauche.generator)
(define (parse-rgb-line line)
(define tokens
(with-input-from-string line (cut generator->list read)))
(list (take tokens 3)
(string-join (map symbol->string (drop tokens 3)) " ")))
(parse-rgb-line " 62 128 255 light blue ")
===>
((62 128 255) "light blue")
(parse-rgb-line "62 128 255 LightBlue")
===>
((62 128 255) "LightBlue")
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