From 06a3d47ea9fd1b67b3acba9d115a16d18549e377 Mon Sep 17 00:00:00 2001
From: Felix Mulder <felix.mulder@gmail.com>
Date: Wed, 26 Oct 2016 16:19:35 +0200
Subject: Move sjs, make sure that partest compiles everything in dirs

---
 sjs/backend/sjs/JSPositions.scala | 65 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 65 insertions(+)
 create mode 100644 sjs/backend/sjs/JSPositions.scala

(limited to 'sjs/backend/sjs/JSPositions.scala')

diff --git a/sjs/backend/sjs/JSPositions.scala b/sjs/backend/sjs/JSPositions.scala
new file mode 100644
index 000000000..10570da00
--- /dev/null
+++ b/sjs/backend/sjs/JSPositions.scala
@@ -0,0 +1,65 @@
+package dotty.tools.backend.sjs
+
+import dotty.tools.dotc.core._
+import Contexts._
+import dotty.tools.dotc.util.Positions
+import Positions.Position
+
+import org.scalajs.core.ir
+
+/** Conversion utilities from dotty Positions to IR Positions. */
+class JSPositions()(implicit ctx: Context) {
+
+  /** Implicit conversion from dotty Position to ir.Position. */
+  implicit def pos2irPos(pos: Positions.Position): ir.Position = {
+    if (!pos.exists) ir.Position.NoPosition
+    else {
+      val source = pos2irPosCache.toIRSource(ctx.compilationUnit.source)
+      val sourcePos = ctx.compilationUnit.source.atPos(pos)
+      // dotty positions are 1-based but IR positions are 0-based
+      ir.Position(source, sourcePos.line-1, sourcePos.column-1)
+    }
+  }
+
+  /** Implicitly materializes an ir.Position from an implicit dotty Position. */
+  implicit def implicitPos2irPos(
+      implicit pos: Positions.Position): ir.Position = {
+    pos2irPos(pos)
+  }
+
+  private[this] object pos2irPosCache { // scalastyle:ignore
+    import dotty.tools.dotc.util._
+
+    private[this] var lastDotcSource: SourceFile = null
+    private[this] var lastIRSource: ir.Position.SourceFile = null
+
+    def toIRSource(dotcSource: SourceFile): ir.Position.SourceFile = {
+      if (dotcSource != lastDotcSource) {
+        lastIRSource = convert(dotcSource)
+        lastDotcSource = dotcSource
+      }
+      lastIRSource
+    }
+
+    private[this] def convert(dotcSource: SourceFile): ir.Position.SourceFile = {
+      dotcSource.file.file match {
+        case null =>
+          new java.net.URI(
+              "virtualfile",        // Pseudo-Scheme
+              dotcSource.file.path, // Scheme specific part
+              null                  // Fragment
+          )
+        case file =>
+          val srcURI = file.toURI
+          def matches(pat: java.net.URI) = pat.relativize(srcURI) != srcURI
+
+          // TODO
+          /*scalaJSOpts.sourceURIMaps.collectFirst {
+            case ScalaJSOptions.URIMap(from, to) if matches(from) =>
+              val relURI = from.relativize(srcURI)
+              to.fold(relURI)(_.resolve(relURI))
+          } getOrElse*/ srcURI
+      }
+    }
+  }
+}
-- 
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