Added main runner and driver.

Left dummies for Compiler and Run.

1 files changed, 44 insertions, 0 deletions

diff --git a/src/dotty/tools/dotc/Driver.scala b/src/dotty/tools/dotc/Driver.scala
new file mode 100644
index 000000000..a175b8bc4
--- /dev/null
+++ b/src/dotty/tools/dotc/Driver.scala
@@ -0,0 +1,44 @@
+package dotty.tools.dotc
+
+import config.CompilerCommand
+import core.Contexts.{Context, ContextBase}
+import core.DotClass
+
+abstract class Driver extends DotClass {
+
+  val prompt = "\ndotc>"
+
+  protected def newCompiler(): Compiler
+
+  protected def doCompile(compiler: Compiler, fileNames: List[String])(implicit ctx: Context) =
+    if (fileNames.nonEmpty) {
+      val run = compiler.newRun
+      run.compile(fileNames)
+      ctx.reporter.printSummary
+    }
+
+  protected def initCtx = (new ContextBase).initialCtx
+
+  def process(args: Array[String]): Boolean = {
+    val summary = CompilerCommand.distill(args)(initCtx)
+    implicit val ctx = initCtx.fresh.withSettings(summary.sstate)
+    val fileNames = CompilerCommand.checkUsage(summary)
+    try {
+      doCompile(newCompiler(), fileNames)
+      !ctx.reporter.hasErrors
+    } catch {
+      case ex: Throwable =>
+        ctx.error(ex.getMessage)
+        ex match {
+          case ex: FatalError  => false // signals that we should fail compilation.
+          case _               => throw ex // unexpected error, tell the outside world.
+        }
+    }
+  }
+
+  def main(args: Array[String]): Unit =
+    sys.exit(if (process(args)) 1 else 0)
+}
+
+class FatalError(msg: String) extends Exception
+