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Clearer error message for children assignment.

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Rob Rix 2017-04-13 10:50:00 -04:00
parent 3de5f3aaf9
commit a0322cf652
1 changed files with 1 additions and 0 deletions
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src/Data/Syntax/Assignment.hs
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@ -82,6 +82,7 @@ runAssignment = iterFreer (\ assignment yield nodes -> case (assignment, skipAno
_ -> Error ["No rule to match " <> show node] _ -> Error ["No rule to match " <> show node]
(Rule symbol, []) -> Error [ "Expected " <> show symbol <> " but got end of input." ] (Rule symbol, []) -> Error [ "Expected " <> show symbol <> " but got end of input." ]
(Content, []) -> Error [ "Expected leaf node but got end of input." ] (Content, []) -> Error [ "Expected leaf node but got end of input." ]
(Children _, []) -> Error [ "Expected branch node but got end of input." ]
_ -> Error ["No rule to match at end of input."]) _ -> Error ["No rule to match at end of input."])
. fmap ((Result .) . flip (,)) . fmap ((Result .) . flip (,))
where skipAnonymous = dropWhile ((/= Regular) . symbolType . nodeSymbol . roseValue) where skipAnonymous = dropWhile ((/= Regular) . symbolType . nodeSymbol . roseValue)