Fix #3655: Remove hl interpolator

compiler/src/dotty/tools/dotc/ast/Desugar.scala

@@ -14,6 +14,7 @@ import collection.mutable.ListBuffer
 import reporting.diagnostic.messages._
 import reporting.trace
 import annotation.constructorOnly
+import printing.Formatting.hl
 
 import scala.annotation.internal.sharable
 
@@ -762,12 +763,12 @@ object desugar {
     def flagSourcePos(flag: FlagSet) = mods.mods.find(_.flags == flag).fold(mdef.sourcePos)(_.sourcePos)
 
     if (mods.is(Abstract))
-      ctx.error(hl"""$Abstract modifier cannot be used for objects""", flagSourcePos(Abstract))
+      ctx.error(em"${hl("abstract")} modifier cannot be used for objects", flagSourcePos(Abstract))
     if (mods.is(Sealed))
-      ctx.error(hl"""$Sealed modifier is redundant for objects""", flagSourcePos(Sealed))
+      ctx.error(em"${hl("sealed")} modifier is redundant for objects", flagSourcePos(Sealed))
     // Maybe this should be an error; see https://github.com/scala/bug/issues/11094.
     if (mods.is(Final) && !mods.is(Synthetic))
-      ctx.warning(hl"""$Final modifier is redundant for objects""", flagSourcePos(Final))
+      ctx.warning(em"${hl("final")} modifier is redundant for objects", flagSourcePos(Final))
 
     if (mods is Package)
       PackageDef(Ident(moduleName), cpy.ModuleDef(mdef)(nme.PACKAGE, impl).withMods(mods &~ Package) :: Nil)

compiler/src/dotty/tools/dotc/core/Decorators.scala

@@ -184,7 +184,6 @@ object Decorators {
   }
 
   implicit class StringInterpolators(val sc: StringContext) extends AnyVal {
-
     /** General purpose string formatting */
     def i(args: Any*)(implicit ctx: Context): String =
       new StringFormatter(sc).assemble(args)
@@ -200,10 +199,6 @@ object Decorators {
      */
     def ex(args: Any*)(implicit ctx: Context): String =
       explained(implicit ctx => em(args: _*))
-
-    /** Formatter that adds syntax highlighting to all interpolated values */
-    def hl(args: Any*)(implicit ctx: Context): String =
-      new SyntaxFormatter(sc).assemble(args).stripMargin
   }
 
   implicit class ArrayInterpolator[T <: AnyRef](val arr: Array[T]) extends AnyVal {

compiler/src/dotty/tools/dotc/printing/Formatting.scala

@@ -23,7 +23,6 @@ object Formatting {
    *     against accidentally treating an interpolated value as a margin.
    */
   class StringFormatter(protected val sc: StringContext) {
-
     protected def showArg(arg: Any)(implicit ctx: Context): String = arg match {
       case arg: Showable =>
         try arg.show
@@ -207,7 +206,7 @@ object Formatting {
       lazy val maxLen = parts.map(_._1.length).max
       parts.map {
         case (leader, trailer) =>
-          val variable = hl"$leader"
+          val variable = hl(leader)
           s"""$variable${" " * (maxLen - leader.length)} $trailer"""
       }
     }
@@ -277,4 +276,8 @@ object Formatting {
       case _ => (fnd, exp)
     }
   }
+
+  /** Explicit syntax highlighting */
+  def hl(s: String)(implicit ctx: Context): String =
+    SyntaxHighlighting.highlight(s)
 }

compiler/src/dotty/tools/dotc/printing/PlainPrinter.scala

@@ -343,7 +343,7 @@ class PlainPrinter(_ctx: Context) extends Printer {
         val declsText =
           if (trueDecls.isEmpty || !ctx.settings.Ydebug.value) Text()
           else dclsText(trueDecls)
-        tparamsText ~ " extends " ~ toTextParents(tp.parents) ~ "{" ~ selfText ~ declsText ~
+        tparamsText ~ " extends " ~ toTextParents(tp.parents) ~~ "{" ~ selfText ~ declsText ~
           "} at " ~ preText
       case mt: MethodType =>
         toTextGlobal(mt)
@@ -424,7 +424,7 @@ class PlainPrinter(_ctx: Context) extends Printer {
 
   def toText(sym: Symbol): Text =
     (kindString(sym) ~~ {
-      if (sym.isAnonymousClass) toText(sym.info.parents, " with ") ~ "{...}"
+      if (sym.isAnonymousClass) toTextParents(sym.info.parents) ~~ "{...}"
       else if (hasMeaninglessName(sym)) simpleNameString(sym.owner) + idString(sym)
       else nameString(sym)
     }).close

compiler/src/dotty/tools/dotc/printing/RefinedPrinter.scala

@@ -116,6 +116,9 @@ class RefinedPrinter(_ctx: Context) extends PlainPrinter(_ctx) {
     super.toTextPrefix(tp)
   }
 
+  override protected def toTextParents(parents: List[Type]): Text =
+    Text(parents.map(toTextLocal).map(typeText), keywordStr(" with "))
+
   override protected def refinementNameString(tp: RefinedType): String =
     if (tp.parent.isInstanceOf[WildcardType] || tp.refinedName == nme.WILDCARD)
       super.refinementNameString(tp)
@@ -212,7 +215,7 @@ class RefinedPrinter(_ctx: Context) extends PlainPrinter(_ctx) {
       case ErasedValueType(tycon, underlying) =>
         return "ErasedValueType(" ~ toText(tycon) ~ ", " ~ toText(underlying) ~ ")"
       case tp: ClassInfo =>
-        return toTextParents(tp.parents) ~ "{...}"
+        return toTextParents(tp.parents) ~~ "{...}"
       case JavaArrayType(elemtp) =>
         return toText(elemtp) ~ "[]"
       case tp: AnnotatedType if homogenizedView =>
@@ -825,14 +828,21 @@ class RefinedPrinter(_ctx: Context) extends PlainPrinter(_ctx) {
         case info: ImportType => return s"import $info.expr.show"
         case _ =>
       }
-    if (sym.is(ModuleClass)) {
-      val name =
-        if (sym.isPackageObject && sym.name.stripModuleClassSuffix == tpnme.PACKAGE) sym.owner.name
-        else sym.name.stripModuleClassSuffix
-      kindString(sym) ~~ (nameString(name) + idString(sym))
-    }
-    else
-      super.toText(sym)
+    def name =
+      if (sym.is(ModuleClass) && sym.isPackageObject && sym.name.stripModuleClassSuffix == tpnme.PACKAGE)
+        nameString(sym.owner.name)
+      else if (sym.is(ModuleClass))
+        nameString(sym.name.stripModuleClassSuffix)
+      else if (hasMeaninglessName(sym))
+        simpleNameString(sym.owner)
+      else
+        nameString(sym)
+    (keywordText(kindString(sym)) ~~ {
+      if (sym.isAnonymousClass)
+        toTextParents(sym.info.parents) ~~ "{...}"
+      else
+        typeText(name)
+    }).close
   }
 
   /** String representation of symbol's kind. */

compiler/src/dotty/tools/dotc/reporting/MessageRendering.scala

@@ -134,9 +134,9 @@ trait MessageRendering {
   /** Explanation rendered under "Explanation" header */
   def explanation(m: Message)(implicit ctx: Context): String = {
     val sb = new StringBuilder(
-      hl"""|
-           |${Blue("Explanation")}
-           |${Blue("===========")}"""
+      s"""|
+          |${Blue("Explanation").show}
+          |${Blue("===========").show}""".stripMargin
     )
     sb.append(EOL).append(m.explanation)
     if (m.explanation.lastOption != Some(EOL)) sb.append(EOL)