Hi,
Sorry to post yet again! I've been trying to write something to read lines
from a file while ignoring comments, and have gotten this far:
: readln-skipcomments ( -- line )
[ { [ string? ] [ first CHAR: # = not ] [ ] } 1&& ] [ readln ] do while
;
The problem is that it seems that while consumes the result of running
pred, so this ends up not returning anything. If I put a dup into the last
entry in the 1&&, to leave an extra copy on the stack in case of success,
then I get a deep error complaining that the stack effect of the inputs of
1&&'s internal ifs are unbalanced. If I put the dup after the 1&& in the
while I get an error that pred is unbalanced. If I put it in the looped
quotation I get the error that the loop is not balanced by pred. Is there
any way I can do this?
Mark
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