Hi all,
I'm going crazy trying to get Alex to do what I want. I have the
following regexp macros:
@octEscape = [0123]? $octdig{1,2}
@hexEscape = 'u' $hexdig{4}
@charEscape = '\\' (@octEscape | @hexEscape | b | t | n | f | r | \" | \')
and the following rules:
\' (. # [\'\\] | @charEscape) \' { \p s -> CharTok (readCharTok s) }
\" (. # [\"\\] | @charEscape)* \" { \p s -> StringTok
(readStringTok s) }
I've tried a lot of variations on where to put the backslashes and
quotes to get it to do what I want, what you see above is just one
variation, but no matter what I try I can't get it to work.
> alexScanTokens $ show '\n'
*** Exception: lexical error
Can anyone help shed some light on this for me? Why can't I get alex
to recognize escapes inside character literals?
Cheers,
/Niklas
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