1 files changed, 38 insertions, 0 deletions
diff --git a/tools/shared/src/main/scala/scala/scalajs/tools/classpath/builder/ClasspathElementsTraverser.scala b/tools/shared/src/main/scala/scala/scalajs/tools/classpath/builder/ClasspathElementsTraverser.scala
new file mode 100644
index 0000000..9403ce3
--- /dev/null
+++ b/tools/shared/src/main/scala/scala/scalajs/tools/classpath/builder/ClasspathElementsTraverser.scala
@@ -0,0 +1,38 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___      __ ____  Scala.js tools             **
+**    / __/ __// _ | / /  / _ | __ / // __/  (c) 2013-2014, LAMP/EPFL   **
+**  __\ \/ /__/ __ |/ /__/ __ |/_// /_\ \    http://scala-js.org/       **
+** /____/\___/_/ |_/____/_/ | |__/ /____/                               **
+**                          |/____/                                     **
+\*                                                                      */
+
+
+package scala.scalajs.tools.classpath.builder
+
+import scala.scalajs.tools.io._
+
+/** A helper trait to traverse an arbitrary classpath element
+ *  (i.e. a JAR or a directory).
+ */
+trait ClasspathElementsTraverser extends JarTraverser
+                                    with DirTraverser
+                                    with FileSystem {
+
+  protected def traverseClasspathElements(cp: Seq[File]): String =
+    CacheUtils.joinVersions(cp.map(readEntriesInClasspathElement _): _*)
+
+  /** Adds the Scala.js classpath entries in a directory or jar.
+   *  Returns the accumulated version
+   */
+  private def readEntriesInClasspathElement(element: File): String = {
+    if (!exists(element))
+      getDummyVersion(element)
+    else if (isDirectory(element))
+      traverseDir(element)
+    else if (isJARFile(element))
+      traverseJar(element)
+    else
+      sys.error(s"$element (in classpath) exists and is neither JAR or directory")
+  }
+
+}