Backport "Add missing -Yexplicit-nulls for presentation compiler" to LTS (#20758)

Backports #18776 to the LTS branch.

PR submitted by the release tooling.
[skip ci]

Author: WojciechMazur

presentation-compiler/src/main/dotty/tools/pc/AutoImports.scala

@@ -23,7 +23,7 @@ object AutoImports:
     def renameConfigMap(config: PresentationCompilerConfig)(using
         Context
     ): Map[Symbol, String] =
-      config.symbolPrefixes.asScala.flatMap { (from, to) =>
+      config.symbolPrefixes().nn.asScala.flatMap { (from, to) =>
         val pkg = SemanticdbSymbols.inverseSemanticdbSymbol(from)
         val rename = to.stripSuffix(".").stripSuffix("#")
         List(pkg, pkg.map(_.moduleClass)).flatten
@@ -246,7 +246,7 @@ object AutoImports:
         // see WorksheetProvider.worksheetScala3AdjustmentsForPC
         val indent =
           if pos.source.path.isWorksheet &&
-            editPos.getStart().getCharacter() == 0
+            editPos.getStart().nn.getCharacter() == 0
           then indent0.drop(2)
           else indent0
         val topPadding =

presentation-compiler/src/main/dotty/tools/pc/AutoImportsProvider.scala

@@ -29,13 +29,12 @@ final class AutoImportsProvider(
 )(using ReportContext):
 
   def autoImports(isExtension: Boolean): List[AutoImportsResult] =
-    val uri = params.uri
+    val uri = params.uri().nn
+    val text = params.text().nn
     val filePath = Paths.get(uri)
-    driver.run(
-      uri,
-      SourceFile.virtual(filePath.toString, params.text)
-    )
-    val unit = driver.currentCtx.run.units.head
+    driver.run(uri, SourceFile.virtual(filePath.toString, text))
+
+    val unit = driver.currentCtx.run.nn.units.head
     val tree = unit.tpdTree
 
     val pos = driver.sourcePosition(params)
@@ -81,7 +80,7 @@ final class AutoImportsProvider(
             val generator =
               AutoImports.generator(
                 correctedPos,
-                params.text,
+                text,
                 tree,
                 unit.comments,
                 indexedContext.importContext,

presentation-compiler/src/main/dotty/tools/pc/CompilerSearchVisitor.scala

@@ -17,7 +17,7 @@ class CompilerSearchVisitor(
 )(using ctx: Context, reports: ReportContext)
     extends SymbolSearchVisitor:
 
-  val logger: Logger = Logger.getLogger(classOf[CompilerSearchVisitor].getName)
+  val logger: Logger = Logger.getLogger(classOf[CompilerSearchVisitor].getName().nn).nn
 
   private def isAccessible(sym: Symbol): Boolean = try
     sym != NoSymbol && sym.isPublic && sym.isStatic
@@ -68,7 +68,7 @@ class CompilerSearchVisitor(
       .split("\\$")
 
     val added =
-      try toSymbols(pkg, innerPath.toList).filter(visitSymbol)
+      try toSymbols(pkg, innerPath.nn.toList.map(_.nn)).filter(visitSymbol)
       catch
         case NonFatal(e) =>
           logger.log(Level.WARNING, e.getMessage(), e)
@@ -95,6 +95,6 @@ class CompilerSearchVisitor(
   override def isCancelled: Boolean = false
 
   private def normalizePackage(pkg: String): String =
-    pkg.replace("/", ".").stripSuffix(".")
+    pkg.replace("/", ".").nn.stripSuffix(".")
 
 end CompilerSearchVisitor

presentation-compiler/src/main/dotty/tools/pc/CompletionItemResolver.scala

@@ -30,7 +30,7 @@ object CompletionItemResolver extends ItemResolver:
           .orElse(
             search.symbolDocumentation(gsym.companion)
           ) match
-          case Some(info) if item.getDetail != null =>
+          case Some(info) if item.getDetail() != null =>
             enrichDocs(
               item,
               info,
@@ -50,7 +50,7 @@ object CompletionItemResolver extends ItemResolver:
       Context
   ): String =
     def docs(gsym: Symbol): String =
-      search.symbolDocumentation(gsym).fold("")(_.docstring())
+      search.symbolDocumentation(gsym).fold("")(_.docstring().nn)
     val gsymDoc = docs(gsym)
     def keyword(gsym: Symbol): String =
       if gsym.isClass then "class"
@@ -60,7 +60,7 @@ object CompletionItemResolver extends ItemResolver:
       else ""
     val companion = gsym.companion
     if companion == NoSymbol || gsym.is(JavaDefined) then
-      if gsymDoc.isEmpty then
+      if gsymDoc.isEmpty() then
         if gsym.isAliasType then
           fullDocstring(gsym.info.metalsDealias.typeSymbol, search)
         else if gsym.is(Method) then
@@ -73,8 +73,8 @@ object CompletionItemResolver extends ItemResolver:
       else gsymDoc
     else
       val companionDoc = docs(companion)
-      if companionDoc.isEmpty then gsymDoc
-      else if gsymDoc.isEmpty then companionDoc
+      if companionDoc.isEmpty() then gsymDoc
+      else if gsymDoc.isEmpty() then companionDoc
       else
         List(
           s"""|### ${keyword(companion)} ${companion.name}

presentation-compiler/src/main/dotty/tools/pc/ConvertToNamedArgumentsProvider.scala

@@ -23,13 +23,12 @@ final class ConvertToNamedArgumentsProvider(
 ):
 
   def convertToNamedArguments: Either[String, List[l.TextEdit]] =
-    val uri = params.uri
+    val uri = params.uri().nn
+    val text = params.text().nn
     val filePath = Paths.get(uri)
-    driver.run(
-      uri,
-      SourceFile.virtual(filePath.toString, params.text)
-    )
-    val unit = driver.currentCtx.run.units.head
+    driver.run(uri, SourceFile.virtual(filePath.toString, text))
+
+    val unit = driver.currentCtx.run.nn.units.head
     val newctx = driver.currentCtx.fresh.setCompilationUnit(unit)
     val pos = driver.sourcePosition(params)
     val trees = driver.openedTrees(uri)

presentation-compiler/src/main/dotty/tools/pc/ExtractMethodProvider.scala

@@ -38,12 +38,12 @@ final class ExtractMethodProvider(
     extends ExtractMethodUtils:
 
   def extractMethod(): List[TextEdit] =
-    val text = range.text()
-    val uri = range.uri
+    val text = range.text().nn
+    val uri = range.uri().nn
     val filePath = Paths.get(uri)
     val source = SourceFile.virtual(filePath.toString, text)
     driver.run(uri, source)
-    val unit = driver.currentCtx.run.units.head
+    val unit = driver.currentCtx.run.nn.units.head
     val pos = driver.sourcePosition(range).startPos
     val path =
       Interactive.pathTo(driver.openedTrees(uri), pos)(using driver.currentCtx)
@@ -145,7 +145,7 @@ final class ExtractMethodProvider(
         val oldIndentLen = head.startPos.startColumnPadding.length()
         val toExtract =
           textToExtract(
-            range.text(),
+            text,
             head.startPos.start,
             expr.endPos.end,
             newIndent,

presentation-compiler/src/main/dotty/tools/pc/HoverProvider.scala

@@ -32,8 +32,9 @@ object HoverProvider:
       driver: InteractiveDriver,
       search: SymbolSearch
   )(implicit reportContext: ReportContext): ju.Optional[HoverSignature] =
-    val uri = params.uri
-    val sourceFile = SourceFile.virtual(params.uri, params.text)
+    val uri = params.uri().nn
+    val text = params.text().nn
+    val sourceFile = SourceFile.virtual(uri, text)
     driver.run(uri, sourceFile)
 
     given ctx: Context = driver.currentCtx
@@ -54,7 +55,7 @@ object HoverProvider:
     then
       def report =
         val posId =
-          if path.isEmpty || path.head.sourcePos == null || !path.head.sourcePos.exists
+          if path.isEmpty || !path.head.sourcePos.exists
           then pos.start
           else path.head.sourcePos.start
         Report(
@@ -77,7 +78,7 @@ object HoverProvider:
         )
       end report
       reportContext.unsanitized.create(report, ifVerbose = true)
-      ju.Optional.empty()
+      ju.Optional.empty().nn
     else
       val skipCheckOnName =
         !pos.isPoint // don't check isHoveringOnName for RangeHover
@@ -125,7 +126,7 @@ object HoverProvider:
 
           val docString = symbolTpes
             .flatMap(symTpe => search.symbolDocumentation(symTpe._1))
-            .map(_.docstring)
+            .map(_.docstring())
             .mkString("\n")
           printer.expressionType(exprTpw) match
             case Some(expressionType) =>
@@ -143,9 +144,9 @@ object HoverProvider:
                   docstring = Some(docString),
                   forceExpressionType = forceExpressionType
                 )
-              )
+              ).nn
             case _ =>
-              ju.Optional.empty
+              ju.Optional.empty().nn
           end match
       end match
     end if
@@ -188,7 +189,7 @@ object HoverProvider:
 
       refTpe.flatMap(findRefinement).asJava
     case _ =>
-      ju.Optional.empty()
+      ju.Optional.empty().nn
 
 end HoverProvider
 

presentation-compiler/src/main/dotty/tools/pc/IndexedContext.scala

@@ -7,6 +7,7 @@ import dotty.tools.dotc.core.Contexts.*
 import dotty.tools.dotc.core.Flags.*
 import dotty.tools.dotc.core.NameOps.moduleClassName
 import dotty.tools.dotc.core.Names.*
+import dotty.tools.dotc.core.Scopes.EmptyScope
 import dotty.tools.dotc.core.Symbols.*
 import dotty.tools.dotc.core.Types.*
 import dotty.tools.dotc.typer.ImportInfo
@@ -82,7 +83,6 @@ object IndexedContext:
 
   def apply(ctx: Context): IndexedContext =
     ctx match
-      case null => Empty
       case NoContext => Empty
       case _ => LazyWrapper(using ctx)
 
@@ -205,14 +205,14 @@ object IndexedContext:
     val (symbols, renames) =
       if ctx.isImportContext then
         val (syms, renames) =
-          fromImportInfo(ctx.importInfo)
+          fromImportInfo(ctx.importInfo.nn)
             .map((sym, rename) => (sym, rename.map(r => sym -> r.decoded)))
             .unzip
         (syms, renames.flatten.toMap)
       else if ctx.owner.isClass then
         val site = ctx.owner.thisType
         (accesibleMembers(site), Map.empty)
-      else if ctx.scope != null then (ctx.scope.toList, Map.empty)
+      else if ctx.scope != EmptyScope then (ctx.scope.toList, Map.empty)
       else (List.empty, Map.empty)
 
     val initial = Map.empty[String, List[Symbol]]

presentation-compiler/src/main/dotty/tools/pc/InferredTypeProvider.scala

@@ -62,14 +62,14 @@ final class InferredTypeProvider(
       adjustOpt: Option[AdjustTypeOpts] = None
   ): List[TextEdit] =
     val retryType = adjustOpt.isEmpty
-    val uri = params.uri
-    val filePath = Paths.get(uri)
+    val uri = params.uri().nn
+    val filePath = Paths.get(uri).nn
 
-    val sourceText = adjustOpt.map(_.text).getOrElse(params.text)
+    val sourceText = adjustOpt.map(_.text).getOrElse(params.text().nn)
     val source =
-      SourceFile.virtual(filePath.toString, sourceText)
+      SourceFile.virtual(filePath.toString(), sourceText)
     driver.run(uri, source)
-    val unit = driver.currentCtx.run.units.head
+    val unit = driver.currentCtx.run.nn.units.head
     val pos = driver.sourcePosition(params)
     val path =
       Interactive.pathTo(driver.openedTrees(uri), pos)(using driver.currentCtx)
@@ -78,15 +78,15 @@ final class InferredTypeProvider(
     val indexedCtx = IndexedContext(locatedCtx)
     val autoImportsGen = AutoImports.generator(
       pos,
-      params.text,
+      sourceText,
       unit.tpdTree,
       unit.comments,
       indexedCtx,
       config
     )
 
     def removeType(nameEnd: Int, tptEnd: Int) =
-      sourceText.substring(0, nameEnd) +
+      sourceText.substring(0, nameEnd).nn +
         sourceText.substring(tptEnd + 1, sourceText.length())
 
     def optDealias(tpe: Type): Type =
@@ -134,7 +134,7 @@ final class InferredTypeProvider(
         def baseEdit(withParens: Boolean): TextEdit =
           val keywordOffset = if isParam then 0 else 4
           val endPos =
-            findNamePos(params.text, vl, keywordOffset).endPos.toLsp
+            findNamePos(sourceText, vl, keywordOffset).endPos.toLsp
           adjustOpt.foreach(adjust => endPos.setEnd(adjust.adjustedEndPos))
           new TextEdit(
             endPos,
@@ -148,11 +148,10 @@ final class InferredTypeProvider(
             toCheckFor: Char,
             blockStartPos: SourcePosition
         ) =
-          val text = params.text
-          val isParensFunction: Boolean = text(applyEndingPos) == toCheckFor
+          val isParensFunction: Boolean = sourceText(applyEndingPos) == toCheckFor
 
           val alreadyHasParens =
-            text(blockStartPos.start) == '('
+            sourceText(blockStartPos.start) == '('
 
           if isParensFunction && !alreadyHasParens then
             new TextEdit(blockStartPos.toLsp, "(") :: baseEdit(withParens =
@@ -188,7 +187,7 @@ final class InferredTypeProvider(
               Some(
                 AdjustTypeOpts(
                   removeType(vl.namePos.end, tpt.sourcePos.end - 1),
-                  tpt.sourcePos.toLsp.getEnd()
+                  tpt.sourcePos.toLsp.getEnd().nn
                 )
               )
             )
@@ -227,7 +226,7 @@ final class InferredTypeProvider(
               Some(
                 AdjustTypeOpts(
                   removeType(lastColon, tpt.sourcePos.end - 1),
-                  tpt.sourcePos.toLsp.getEnd()
+                  tpt.sourcePos.toLsp.getEnd().nn
                 )
               )
             )
@@ -256,8 +255,8 @@ final class InferredTypeProvider(
             val firstEnd = patterns(0).endPos.end
             val secondStart = patterns(1).startPos.start
             val hasDot = params
-              .text()
-              .substring(firstEnd, secondStart)
+              .text().nn
+              .substring(firstEnd, secondStart).nn
               .exists(_ == ',')
             if !hasDot then
               val leftParen = new TextEdit(body.startPos.toLsp, "(")
@@ -309,7 +308,7 @@ final class InferredTypeProvider(
           val end = if withBacktick then idx + 1 else idx
           val pos = tree.source.atSpan(Span(start, end, start))
           Some(pos)
-        case None if idx < text.length =>
+        case None if idx < text.length() =>
           val ch = text.charAt(idx)
           if ch == realName.head then
             lookup(idx + 1, Some((idx, realName.tail)), withBacktick)

presentation-compiler/src/main/dotty/tools/pc/MetalsDriver.scala

@@ -48,7 +48,7 @@ class MetalsDriver(
 
   override def run(uri: URI, sourceCode: String): List[Diagnostic] =
     val diags =
-      if alreadyCompiled(uri, sourceCode.toCharArray()) then Nil
+      if alreadyCompiled(uri, sourceCode.toCharArray().nn) then Nil
       else super.run(uri, sourceCode)
     lastCompiledURI = uri
     diags

presentation-compiler/src/main/dotty/tools/pc/PcCollector.scala

@@ -33,24 +33,23 @@ abstract class PcCollector[T](
     params: VirtualFileParams
 ):
   private val caseClassSynthetics: Set[Name] = Set(nme.apply, nme.copy)
-  val uri = params.uri()
-  val filePath = Paths.get(uri)
-  val sourceText = params.text
+  val uri = params.uri().nn
+  val filePath = Paths.get(uri).nn
+  val sourceText = params.text().nn
   val source =
-    SourceFile.virtual(filePath.toString, sourceText)
+    SourceFile.virtual(filePath.toString(), sourceText)
   driver.run(uri, source)
   given ctx: Context = driver.currentCtx
 
-  val unit = driver.currentCtx.run.units.head
+  val unit = driver.currentCtx.run.nn.units.head
   val compilatonUnitContext = ctx.fresh.setCompilationUnit(unit)
   val offset = params match
     case op: OffsetParams => op.offset()
     case _ => 0
   val offsetParams =
     params match
       case op: OffsetParams => op
-      case _ =>
-        CompilerOffsetParams(params.uri(), params.text(), 0, params.token())
+      case _ => CompilerOffsetParams(uri, sourceText, 0, params.token().nn)
   val pos = driver.sourcePosition(offsetParams)
   val rawPath =
     Interactive