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Added an @@ operator for Named patterns, like in the Tock presentation

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Neil Brown 2007-11-21 14:25:32 +00:00
parent d3c246a911
commit 7ea3d2a7f9
1 changed files with 5 additions and 0 deletions
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5
common/TreeUtil.hs
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@ -21,6 +21,7 @@ module TreeUtil (
AnyDataItem(..), Items, castADI,
assertPatternMatch, getMatchedItems,
tag0, tag1, tag2, tag3, tag4, tag5, tag6, tag7, tag1d, tag2d, tag3d, tag4d, tag5d, tag6d, tag7d,
(@@),
mkPattern, stopCaringPattern, namePattern, nameAndStopCaringPattern,
checkTreeForConstr,
con0, con1, con2, con3, con4, con5, con6, con7
@ -240,6 +241,10 @@ namePattern name item = namePattern' name (mkPattern item)
nameAndStopCaringPattern :: Data a => String -> a -> Pattern -> Pattern
nameAndStopCaringPattern n item = (stopCaringPattern item) . (namePattern n item)
(@@) :: Data a => String -> a -> Pattern
(@@) label x = Named label (mkPattern x)
--I'm not sure tag0 is ever needed, but just in case:
tag0 :: (Data a) => a -> Pattern
tag0 con = (Match (toConstr con) [])