1 files changed, 74 insertions, 0 deletions
diff --git a/compiler/src/dotty/tools/dotc/classpath/FileUtils.scala b/compiler/src/dotty/tools/dotc/classpath/FileUtils.scala
new file mode 100644
index 000000000..823efbb9d
--- /dev/null
+++ b/compiler/src/dotty/tools/dotc/classpath/FileUtils.scala
@@ -0,0 +1,74 @@
+/*
+ * Copyright (c) 2014 Contributor. All rights reserved.
+ */
+package dotty.tools.dotc.classpath
+
+import java.io.{File => JFile, FileFilter}
+import java.net.URL
+import scala.reflect.internal.FatalError
+import scala.reflect.io.AbstractFile
+
+/**
+ * Common methods related to Java files and abstract files used in the context of classpath
+ */
+object FileUtils {
+  implicit class AbstractFileOps(val file: AbstractFile) extends AnyVal {
+    def isPackage: Boolean = file.isDirectory && mayBeValidPackage(file.name)
+
+    def isClass: Boolean = !file.isDirectory && file.hasExtension("class") && !file.name.endsWith("$class.class")
+      // FIXME: drop last condition when we stop being compatible with Scala 2.11
+
+    def isScalaOrJavaSource: Boolean = !file.isDirectory && (file.hasExtension("scala") || file.hasExtension("java"))
+
+    // TODO do we need to check also other files using ZipMagicNumber like in scala.tools.nsc.io.Jar.isJarOrZip?
+    def isJarOrZip: Boolean = file.hasExtension("jar") || file.hasExtension("zip")
+
+    /**
+     * Safe method returning a sequence containing one URL representing this file, when underlying file exists,
+     * and returning given default value in other case
+     */
+    def toURLs(default: => Seq[URL] = Seq.empty): Seq[URL] = if (file.file == null) default else Seq(file.toURL)
+  }
+
+  implicit class FileOps(val file: JFile) extends AnyVal {
+    def isPackage: Boolean = file.isDirectory && mayBeValidPackage(file.getName)
+
+    def isClass: Boolean = file.isFile && file.getName.endsWith(".class") && !file.getName.endsWith("$class.class")
+      // FIXME: drop last condition when we stop being compatible with Scala 2.11
+  }
+
+  def stripSourceExtension(fileName: String): String = {
+    if (endsScala(fileName)) stripClassExtension(fileName)
+    else if (endsJava(fileName)) stripJavaExtension(fileName)
+    else throw new FatalError("Unexpected source file ending: " + fileName)
+  }
+
+  def dirPath(forPackage: String) = forPackage.replace('.', '/')
+
+  def endsClass(fileName: String): Boolean =
+    fileName.length > 6 && fileName.substring(fileName.length - 6) == ".class"
+
+  def endsScalaOrJava(fileName: String): Boolean =
+    endsScala(fileName) || endsJava(fileName)
+
+  def endsJava(fileName: String): Boolean =
+    fileName.length > 5 && fileName.substring(fileName.length - 5) == ".java"
+
+  def endsScala(fileName: String): Boolean =
+    fileName.length > 6 && fileName.substring(fileName.length - 6) == ".scala"
+
+  def stripClassExtension(fileName: String): String =
+    fileName.substring(0, fileName.length - 6) // equivalent of fileName.length - ".class".length
+
+  def stripJavaExtension(fileName: String): String =
+    fileName.substring(0, fileName.length - 5)
+
+  // probably it should match a pattern like [a-z_]{1}[a-z0-9_]* but it cannot be changed
+  // because then some tests in partest don't pass
+  def mayBeValidPackage(dirName: String): Boolean =
+    (dirName != "META-INF") && (dirName != "") && (dirName.charAt(0) != '.')
+
+  def mkFileFilter(f: JFile => Boolean) = new FileFilter {
+    def accept(pathname: JFile): Boolean = f(pathname)
+  }
+}