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Diffstat (limited to 'src/library/scala/reflect/api/Positions.scala')
| -rw-r--r-- | src/library/scala/reflect/api/Positions.scala | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/src/library/scala/reflect/api/Positions.scala b/src/library/scala/reflect/api/Positions.scala index 181e7c1525..4c8c33bec8 100644 --- a/src/library/scala/reflect/api/Positions.scala +++ b/src/library/scala/reflect/api/Positions.scala @@ -1,9 +1,21 @@ package scala.reflect package api -trait Positions { +trait Positions { self: Universe => + /** TreeAnnotation is a generalisation of Position. + * + * TreeAnnotation cannot be an upperbound of Position since the corresponding classes + * must live outside of the universe for backwards compatibility (see scala.tools.nsc.util.Position). + * Thus, represent subtyping as coercions. + * + * Typically, positionToAnnotation is the identity, and annotationToPosition returns annot.pos + */ + type TreeAnnotation // <: { def pos: Position } + val NoTreeAnnotation: TreeAnnotation + implicit def positionToAnnotation(pos: Position): TreeAnnotation // = pos + def annotationToPosition(annot: TreeAnnotation): Position // = annot.pos + def _checkSetAnnotation(tree: Tree, annot: TreeAnnotation): Unit = () // check that annot may overwrite tree.annot - type Position + type Position // <: TreeAnnotation, but not practical to enforce this (would require moving Position, SourceFile, Reporter,... into the universe) val NoPosition: Position - }
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