9 Apr
2007
9 Apr
'07
7:27 p.m.
Albert, On Apr 10, 2007, at 12:19 AM, Albert Y. C. Lai wrote:
As you probably suspect, one single use of buildExpressionParser cannot accomplish it. It is equivalent to the problem of homogeneous lists.
The issue is that I need buildExpressionParser to parse numerical expression but return logical ones, i.e. data CondExpr = CondExpr Op NumExpr NumExpr The way b-E-P is set up it wants NumExpr to be its return type and thus I cannot return a CondExpr. I'm still scratching my head but in all likehood I'll have to hack a custom version of b-E-P. Thanks, Joel -- http://wagerlabs.com/