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Avoid revisiting anonymous nodes.

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Rob Rix 2017-04-26 11:47:53 -04:00
parent e89ea96739
commit ffbca016db
1 changed files with 2 additions and 2 deletions
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4
src/Data/Syntax/Assignment.hs
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@ -99,7 +99,7 @@ runAssignment :: forall grammar a. (Symbol grammar, Enum grammar, Eq grammar, Sh
runAssignment = iterFreer (\ assignment yield state -> case (assignment, dropAnonymous state) of
-- Nullability: some rules, e.g. 'pure a' and 'many a', should match at the end of input. Either side of an alternation may be nullable, ergo Alt can match at the end of input.
(Alt a b, state) -> yield a state <|> yield b state
(assignment, AssignmentState offset _ source (subtree@(Rose (symbol :. range :. span :. Nil) children) : _)) -> case assignment of
(assignment, state@(AssignmentState offset _ source (subtree@(Rose (symbol :. range :. span :. Nil) children) : _))) -> case assignment of
Symbol s -> if s == symbol then
yield () state
else
@ -114,7 +114,7 @@ runAssignment = iterFreer (\ assignment yield state -> case (assignment, dropAno
Nothing -> Error ["Expected " <> showChoices choices <> " but got " <> show subtree]
_ -> Error ["No rule to match " <> show subtree]
(Symbol s, AssignmentState{}) -> Error [ "Expected " <> show s <> " but got end of input." ]
(Location, AssignmentState{..}) -> yield (Info.Range stateOffset stateOffset :. Info.SourceSpan statePos statePos :. Nil) state
(Location, state@AssignmentState{..}) -> yield (Info.Range stateOffset stateOffset :. Info.SourceSpan statePos statePos :. Nil) state
(Source, AssignmentState{}) -> Error [ "Expected leaf node but got end of input." ]
(Children _, AssignmentState{}) -> Error [ "Expected branch node but got end of input." ]
(Choose choices, AssignmentState{}) -> Error [ "Expected " <> showChoices choices <> " but got end of input." ]