I'm parsing a grammar in which the semicolon on the end of a line is
optional. So two of the statement rules might be:
| (ID GETS expr SEMI) => ID GETS expr SEMI -> ^(GETS ID expr SEMI)
| (ID GETS) => ID GETS expr -> ^(GETS ID expr)
Since this occurs with a number of different assignment statements, I
would really like to collapse this into one rule that looks something
like this:
| (ID GETS) => ID GETS e=expr (s=SEMI)? -> ^(GETS ID $e $s)
but every implementation I can think of either refuses to generate
the grammar or, as in the case above, generates the grammar but
decides that the variable 's' is unknown.
Is there a any way to achieve this?
DMS
David M. Smith http://www.cc.gatech.edu/fac/David.Smith
Georgia Institute of Technology, College of Computing
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