First PoC of REPL

Adaptation of REPL by Spoon from ca 2007. Compiles OK, but
not yet tested.

1 files changed, 47 insertions, 0 deletions

diff --git a/src/dotty/tools/dotc/REPL.scala b/src/dotty/tools/dotc/REPL.scala
new file mode 100644
index 000000000..a0255efa6
--- /dev/null
+++ b/src/dotty/tools/dotc/REPL.scala
@@ -0,0 +1,47 @@
+package dotty.tools
+package dotc
+
+import core.Phases
+import core.Contexts.Context
+import reporting.Reporter
+import java.io.EOFException
+import scala.annotation.tailrec
+import io.VirtualDirectory
+import java.io.{BufferedReader, File, FileReader, PrintWriter}
+import repl._
+
+/** A compiler which stays resident between runs.
+ *  Usage:
+ *
+ *  > scala dotty.tools.dotc.Resident <options> <initial files>
+ *
+ *  dotc> "more options and files to compile"
+ *
+ *  ...
+ *
+ *  dotc> :reset  // reset all options to the ones passed on the command line
+ *
+ *  ...
+ *
+ *  dotc> :q     // quit
+ */
+class REPL extends Driver {
+
+  def input(implicit ctx: Context): InteractiveReader = {
+    val emacsShell = System.getProperty("env.emacs", "") != ""
+    //println("emacsShell="+emacsShell) //debug
+    if (ctx.settings.Xnojline.value || emacsShell) new SimpleReader()
+    else InteractiveReader.createDefault()
+  }
+
+  def output: PrintWriter = new NewLinePrintWriter(new ConsoleWriter, true)
+
+  override def newCompiler(): Compiler = new repl.Interpreter(output)
+
+  override def sourcesRequired = false
+
+  override def doCompile(compiler: Compiler, fileNames: List[String])(implicit ctx: Context): Reporter = {
+    new InterpreterLoop(compiler, input, output).run()
+    ctx.reporter
+  }
+}