Using Mark Kantrowitz old but very handy infix we noticed some peculiar pattern
of errors where very basic expressions do not correctly convert infix
expressions into prefix ones. The version I just tried was this one:
http://www.cliki.net/infix
in => pre, red for incorrect
"a + 1" => (+ A 1)
"s + 1" => S+1
"s - 1" => S-1
"s * 1" => (* S 1)
"a + 1.5" => (+ A 1.5)
"s + 1.5" => (+ S 1.5)
"s + s" => (+ S S)
"s + 1 + 1" => (+ S+1 1)
"s + 1e1" => (+ S 10.0)
Can somebody see a pattern here? AFAIK, the combination of the one letter
variables names that are characters D, E, F, L, or S followed by "+" or "-" and
then followed by an int does not work.
Is this a bug or some very special case that is supposed to work like this for
no (to me) obvious reason? If this is bug, how could this have slipped through
the net for so many years? I know many people have using this software. I tried
various versions of infix.lisp. Are D, E, F, L, or S special tokens? If so,
what do they mean, and where are they declared?
Confused, Alex
---- test program spitting out the variable names not working ------
This should print nothing:
(map
nil
#'(lambda (Char)
(when (symbolp (read-from-string (format nil "#i(~A + 1)" Char))) ;;
should be a list, NOT a symbol!
(print Char)))
"ABCDEFGHIJKLMNOPQRSTUVWXYZ")
but prints:
#\D
#\E
#\F
#\L
#\S
Prof. Alexander Repenning
University of Colorado
Computer Science Department
Boulder, CO 80309-430
vCard: http://www.cs.colorado.edu/~ralex/AlexanderRepenning.vcf
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