ImportInfo: removed ctx parameter from constructor

ImportInfo#toString required the ctx parameter,so it was replaced by
ImportInfo#toText.

Author: smarter

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

@@ -7,6 +7,7 @@ import Contexts.Context, Scopes.Scope, Denotations.Denotation, Annotations.Annot
 import StdNames.{nme, tpnme}
 import ast.Trees._, ast._
 import typer.Implicits._
+import typer.ImportInfo
 import config.Config
 import java.lang.Integer.toOctalString
 import config.Config.summarizeDepth
@@ -502,6 +503,17 @@ class PlainPrinter(_ctx: Context) extends Printer {
       "?Unknown Implicit Result?"
   }
 
+  def toText(importInfo: ImportInfo): Text = {
+    val siteStr = importInfo.site.show
+    val exprStr = if (siteStr endsWith ".type") siteStr dropRight 5 else siteStr
+    val selectorStr = importInfo.selectors match {
+      case Ident(name) :: Nil => name.show
+      case _ => "{...}"
+    }
+    s"import $exprStr.$selectorStr"
+  }
+
+
   private var maxSummarized = Int.MaxValue
 
   def summarized[T](depth: Int)(op: => T): T = {

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

@@ -6,6 +6,7 @@ import Texts._, ast.Trees._
 import Types.Type, Symbols.Symbol, Contexts.Context, Scopes.Scope, Constants.Constant,
        Names.Name, Denotations._, Annotations.Annotation
 import typer.Implicits.SearchResult
+import typer.ImportInfo
 
 /** The base class of all printers
  */
@@ -98,6 +99,9 @@ abstract class Printer {
   /** Textual representation of implicit search result */
   def toText(result: SearchResult): Text
 
+  /** Textual representation of info relating to an import clause */
+  def toText(result: ImportInfo): Text
+
       /** Perform string or text-producing operation `op` so that only a
    *  summarized text with given recursion depth is shown
    */

compiler/src/dotty/tools/dotc/typer/ImportInfo.scala

@@ -5,6 +5,7 @@ package typer
 import ast.{tpd, untpd}
 import ast.Trees._
 import core._
+import printing.{Printer, Showable}
 import util.SimpleMap
 import Symbols._, Names._, Denotations._, Types._, Contexts._, StdNames._, Flags._
 import Decorators.StringInterpolators
@@ -28,7 +29,7 @@ object ImportInfo {
  *                        scala.Predef or dotty.DottyPredef in the start context, false otherwise.
  */
 class ImportInfo(symf: Context => Symbol, val selectors: List[untpd.Tree],
-                 symNameOpt: Option[TermName], val isRootImport: Boolean = false)(implicit ctx: Context) {
+                 symNameOpt: Option[TermName], val isRootImport: Boolean = false) extends Showable {
 
   // Dotty deviation: we cannot use a lazy val here for the same reason
   // that we cannot use one for `DottyPredefModuleRef`.
@@ -91,7 +92,7 @@ class ImportInfo(symf: Context => Symbol, val selectors: List[untpd.Tree],
   }
 
   /** The implicit references imported by this import clause */
-  def importedImplicits: List[TermRef] = {
+  def importedImplicits(implicit ctx: Context): List[TermRef] = {
     val pre = site
     if (isWildcardImport) {
       val refs = pre.implicitMembers
@@ -115,23 +116,21 @@ class ImportInfo(symf: Context => Symbol, val selectors: List[untpd.Tree],
    *      override import Predef.{any2stringAdd => _, StringAdd => _, _} // disables String +
    *      override import java.lang.{}                                   // disables all imports
    */
-  lazy val unimported: Symbol = {
-    lazy val sym = site.termSymbol
-    def maybeShadowsRoot = symNameOpt match {
-      case Some(symName) => defn.ShadowableImportNames.contains(symName)
-      case None => false
+  def unimported(implicit ctx: Context): Symbol = {
+    if (myUnimported == null) {
+      lazy val sym = site.termSymbol
+      def maybeShadowsRoot = symNameOpt match {
+        case Some(symName) => defn.ShadowableImportNames.contains(symName)
+        case None => false
+      }
+      myUnimported =
+        if (maybeShadowsRoot && defn.RootImportTypes.exists(_.symbol == sym)) sym
+        else NoSymbol
+      assert(myUnimported != null)
     }
-    if (maybeShadowsRoot && defn.RootImportTypes.exists(_.symbol == sym)) sym
-    else NoSymbol
+    myUnimported
   }
+  private[this] var myUnimported: Symbol = _
 
-  override def toString = {
-    val siteStr = site.show
-    val exprStr = if (siteStr endsWith ".type") siteStr dropRight 5 else siteStr
-    val selectorStr = selectors match {
-      case Ident(name) :: Nil => name.show
-      case _ => "{...}"
-    }
-    i"import $exprStr.$selectorStr"
-  }
+  def toText(printer: Printer) = printer.toText(this)
 }

compiler/src/dotty/tools/dotc/typer/Typer.scala

@@ -145,7 +145,7 @@ class Typer extends Namer with TypeAssigner with Applications with Implicits wit
        */
       def bindingString(prec: Int, whereFound: Context, qualifier: String = "") =
         if (prec == wildImport || prec == namedImport) {
-          ex"""imported$qualifier by ${hl"${whereFound.importInfo.toString}"}"""
+          ex"""imported$qualifier by ${hl"${whereFound.importInfo}"}"""
         } else
           ex"""defined$qualifier in ${hl"${whereFound.owner.toString}"}"""