xsbt

ExtractUsedNames

class ExtractUsedNames[GlobalType <: CallbackGlobal] extends AnyRef

Extracts simple names used in given compilation unit.

Extracts simple (unqualified) names mentioned in given in non-definition position by collecting all symbols associated with non-definition trees and extracting names from all collected symbols.

If given symbol is mentioned both in definition and in non-definition position (e.g. in member selection) then that symbol is collected. It means that names of symbols defined and used in the same compilation unit are extracted. We've considered not extracting names of those symbols as an optimization strategy. It turned out that this is not correct. Check https://github.com/gkossakowski/sbt/issues/3 for an example of scenario where it matters.

All extracted names are returned in _decoded_ form. This way we stay consistent with the rest of incremental compiler which works with names in decoded form.

Names mentioned in Import nodes are handled properly but require some special logic for two reasons:

  1. import node itself has a term symbol associated with it with a name <import>. I (gkossakowski) tried to track down what role this symbol serves but I couldn't. It doesn't look like there are many places in Scala compiler that refer to that kind of symbols explicitly. 2. ImportSelector is not subtype of Tree therefore is not processed by Tree.foreach

Another type of tree nodes that requires special handling is TypeTree. TypeTree nodes has a little bit odd representation:

  1. TypeTree.hasSymbol always returns false even when TypeTree.symbol returns a symbol 2. The original tree from which given TypeTree was derived is stored in TypeTree.original but Tree.forech doesn't walk into original tree so we missed it

The tree walking algorithm walks into TypeTree.original explicitly.

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Instance Constructors

  1. new ExtractUsedNames(global: GlobalType)

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  1. final def !=(arg0: AnyRef): Boolean

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  2. final def !=(arg0: Any): Boolean

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  3. final def ##(): Int

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  4. final def ==(arg0: AnyRef): Boolean

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  8. final def eq(arg0: AnyRef): Boolean

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  9. def equals(arg0: Any): Boolean

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  10. def extract(unit: GlobalType.CompilationUnit): Set[String]

  11. def finalize(): Unit

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  12. final def getClass(): Class[_]

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  13. val global: GlobalType

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