New books from Apress
andy at hexten.net
Wed May 24 21:31:48 BST 2006
On 24 May 2006, at 21:20, Peter Corlett wrote:
> My own attempt at this rather silly retro game has produced a skeleton
> flex/bison pair for BBC BASIC. The language itself seems regular
> enough to
> parse, but I think I'm going to have to omit the assembler for now.
I imagine it'd be tricky to match the exact semantics of the
tokeniser without a bit of bodgery. If you get as far as wanting to
interpret BBC Basic you need to remember that FOR .. NEXT, REPEAT ..
UNTIL, PROC .. ENDPROC and FN .. = are dynamically scoped. So for
FOR I% = 1 TO 10 : IF I% MOD 2 THEN PRINT "Odd" : NEXT : ELSE PRINT
"Even" : NEXT
is quite legal (if unwise).
Andy Armstrong, hexten.net
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