On 18/10/2010 05:53, Vivian McPhail wrote:
On 18 October 2010 15:37, Vivian McPhail
<[email protected]
<mailto:[email protected]>> wrote:
Hi,
In attempting to use the lexer to see whether we are within an
alternative layout context:
[..]
I have a function which tells us if there is layout going on:
activeContext :: P Bool
activeContext = do
ctxt <- getALRContext
expc <- getAlrExpectingOCurly
impt <- implicitTokenPending
case (ctxt,expc) of
([],Nothing) -> return impt
_other -> return True
Okay, this function is doing the right thing. I also tried counting
curly brackets, which also doesn't work for the same reason:
In "AlternativeLayoutMode," when an EOF is encountered and there is an
outstanding context, the context is removed and a closing curly is inserted
(ITeof, ALRLayout _ _ : ls, _) ->
do setALRContext ls
setNextToken t
return (L thisLoc ITccurly)
So as it stands, if we simply lex the ghci command line, we will never
be inside a layout context once we see the EOF token.
Right, so you need to lex up to the end of the line, but without letting
the lexer see the EOF token, presumably?
Cheers,
Simon
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