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Does Tinyscheme support radix (base)?

April 9, 2009 - 08:55 — Charles Belov

It would seem that Tinyscheme does not support the radix.

Per the Scheme specs at http://www.delorie.com/gnu/docs/guile/r5rs_56.html there is a radix parameter, such that if I code

(number->string 255 16)

I would expect it to return the string "ff".

I tried the attached code (which puts a script "Test Base 16" into a "Debug" menu). I'm expecting the code to put "ff" into the image as a text layer, but it puts "255" in. My ultimate goal is to convert an RGB value 0-255 0-255 0-255 into a Web hex value. Any ideas?

GIMP 2.6.6

Charles Belov

AttachmentSize
testBase16.scm969 bytes
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Plugins & Scripts
April 9, 2009 - 13:53 — saulgoode

Unfortunately, TinyScheme does not implement the radix argument as prescribed by R5RS. You could use the following function to convert numbers in the range of 0-255 to hexadecimal strings (00-FF, change the "55" to "87" for lowercase alphas). (define (byte->hexstr x) (define (nyb->hex x) (if (> x 9) (integer->char (+ 55 x)) (integer->char (+ 48 x)))) (string-append (make-string 1 (nyb->hex (trunc (/ x 16)))) (make-string 1 (nyb->hex (modulo x 16)))))
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