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Added srg0006: A grammar with a cycle caused by an empty production.

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bringert committed 2007-03-25 16:11:51 +00:00
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src/GF/Speech/TransformCFG.hs
+1 -1
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@@ -88,7 +88,7 @@ stateGFCC = mkGFCC . mkCanon2gfcc . stateGrammarST
-- * Grammar filtering
-- | Removes all directly cyclic productions.
-- | Removes all directly and indirectly cyclic productions.
removeCycles :: CFRules -> CFRules
removeCycles = groupProds . removeCycles_ . ungroupProds
where removeCycles_ rs = [r | r@(CFRule c rhs _) <- rs, rhs /= [Cat c]]