Presentation compiler: Add completions for named patterns #22251
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| Original file line number | Diff line number | Diff line change |
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| package dotty.tools.pc.completions | ||
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| import dotty.tools.dotc.ast.tpd.* | ||
| import dotty.tools.dotc.ast.untpd | ||
| import dotty.tools.dotc.core.Flags | ||
| import dotty.tools.dotc.core.Names.Name | ||
| import dotty.tools.dotc.core.StdNames.* | ||
| import dotty.tools.dotc.core.SymDenotations.NoDenotation | ||
| import dotty.tools.dotc.core.Symbols | ||
| import dotty.tools.dotc.core.Symbols.defn | ||
| import dotty.tools.dotc.core.Contexts.* | ||
| import dotty.tools.dotc.core.Types.* | ||
| import dotty.tools.dotc.util.SourcePosition | ||
| import dotty.tools.dotc.ast.NavigateAST | ||
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| import scala.meta.internal.pc.CompletionFuzzy | ||
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| object NamedPatternCompletions: | ||
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| def isInsideParams(sourcePos: SourcePosition, start: Int): Boolean = | ||
| sourcePos.source.content().slice(sourcePos.start, start).foldLeft(0): (count, char) => | ||
| if char == '(' then count + 1 | ||
| else if char == ')' then count - 1 | ||
| else count | ||
| > 0 | ||
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| def unapply(path: List[Tree])(using Context): Option[CompletionPos => List[CompletionValue]] = | ||
| val result = path match | ||
| // case (nam@@ | ||
| // but not case nam@@ | ||
| case (bind: Bind) :: (caseDef: CaseDef) :: Match(selector, _) :: _ | ||
| if isInsideParams(caseDef.sourcePos, bind.sourcePos.end) => | ||
| if selector.tpe.widenDealias.isNamedTupleType then | ||
| Some(selector.tpe.widenDealias.namedTupleElementTypes.toMap, Nil) | ||
| else None | ||
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| // case (name = supername, na@@ | ||
| // case (nam@@, surname = test) => | ||
| case (_: Bind) :: (rest @ (unapply: UnApply) :: _) | ||
| if defn.isTupleClass(unapply.fun.symbol.owner.companionClass) => | ||
| rest.collectFirst: // We can't complete names without knowing the type of selector | ||
| case Match(selector, _) => selector | ||
|
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There was a problem hiding this comment. Won't this fail for nested named tuples? |
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| .flatMap: selector => | ||
| // Named patterns are desugared to normal binds without original arg name info | ||
| val patterns = NavigateAST.untypedPath(unapply).collectFirst: | ||
| case untpd.Tuple(elems) => elems | ||
| .getOrElse(Nil) | ||
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| if selector.tpe.widenDealias.isNamedTupleType then | ||
| Some(selector.tpe.widenDealias.namedTupleElementTypes.toMap, patterns) | ||
| else None | ||
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| // case User(nam@@ | ||
| // case User(nam@@, surname = test) => | ||
| case (_: Bind) :: (rest @ (unapply: UnApply) :: _) => | ||
| Some(unapplyResultNamesToTypes(unapply.fun), unapply.patterns) | ||
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| // This case is happening because nam@@ is removed at desugaring as it is illegal unnamed bind mixed with named one | ||
| // case User(surname = test, nam@@) => | ||
| // case User(surname = test, nam@@ | ||
| case UnApply(fun, _, patterns) :: _ => Some(unapplyResultNamesToTypes(fun), patterns) | ||
| case _ => None | ||
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| result.map: (namesToArgs, patterns) => | ||
| contribute(_, namesToArgs, patterns) | ||
| end unapply | ||
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| private object NamedTupleUnapplyResultType: | ||
| def unapply(tree: Type)(using Context): Option[Type] = tree match | ||
| case AppliedType(TypeRef(_, cls), (namedTuple @ defn.NamedTuple(_, _)) :: Nil) | ||
| if (cls == ctx.definitions.OptionClass || cls == ctx.definitions.SomeClass) => Some(namedTuple) | ||
| case _ => None | ||
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| private def unapplyResultNamesToTypes(tree: Tree)(using Context): Map[Name, Type] = | ||
| tree.tpe.widenDealias.finalResultType match | ||
| // result type is named tuple, we can directly extract names | ||
| case AppliedType(TypeRef(_, cls), (namedTuple @ defn.NamedTuple(_, _)) :: Nil) | ||
| if (cls == ctx.definitions.OptionClass || cls == ctx.definitions.SomeClass) => | ||
| namedTuple.namedTupleElementTypes.toMap | ||
| // unapplies generated for case classes have synthetic names and result type is not a named tuple | ||
| case _ if tree.symbol.flags.is(Flags.Synthetic) => | ||
| val apply = tree.symbol.owner.info.member(nme.apply) | ||
| val maybeApplied = tree match | ||
| // The check for case flag is necessary to filter introduced type bounds T$1..n | ||
| case tpeApply @ TypeApply(_, args) if !args.exists(_.symbol.flags.is(Flags.Case)) => | ||
| apply.info.appliedTo(args.map(_.tpe)) | ||
| case _ => apply.info | ||
|
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There was a problem hiding this comment. Can you simplify and always do: |
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| val unapplyParamList = maybeApplied.paramNamess.indexWhere(_.forall(_.isTermName)) | ||
| if unapplyParamList < 0 then Map.empty | ||
| else | ||
| val paramNames= maybeApplied.paramNamess(unapplyParamList) | ||
| val paramInfos = maybeApplied.paramInfoss(unapplyParamList) | ||
| (paramNames zip paramInfos).toMap | ||
| case _ => Map.empty // we can't help complete non synthetic non named tuple extractors | ||
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| def contribute( | ||
| completionPos: CompletionPos, | ||
| namesToArgs: Map[Name, Type], | ||
| patterns: List[untpd.Tree] | ||
| )(using Context): List[CompletionValue] = | ||
| val usedNames = patterns.collect: | ||
| case untpd.NamedArg(name, _) => name.asTermName | ||
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| val remainingParams = namesToArgs -- usedNames | ||
| remainingParams | ||
| .toList | ||
| .filter: (name, _) => | ||
| CompletionFuzzy.matchesSubCharacters(completionPos.query, name.toString) | ||
| .map: (name, tpe) => | ||
| CompletionValue.NamedArg(name.show + " = ", tpe, NoDenotation) | ||
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Is this intentionally left as TODO?