Crawler, second version

chrome/content/sandbox_ui.js

+let {Logger} = require( "logger" );
+let {Encoding} = require( "encoding" );
+let {Action} = require( "action" );
+
+var what = "actions";
+var output_box;
+function sandbox_start()
+{
+  output_box = document.getElementById( "sandbox_output" );
+  switch ( what )
+  {
+    case "actions":
+      exercise_actions();
+      break;
+  }
+}
+
+var write = function( s )
+{
+  output_box.value += s;
+};
+
+var logger = new Logger( "sandbox" );
+var log = logger.make_log();
+
+//=========================================================================================
+// exercise_actions
+//=========================================================================================
+function exercise_actions()
+{
+  log( "Action" );
+
+  //-----------------------------------------------------------------------------------------
+  write( "---\n" );
+  write( "# 0\n" );
+  var t = typeof Action;
+  write( "Action is " + ((t === 'undefined') ? "not " : "") + "defined."
+    + " It is " + ((t === 'object') ? "" : "not") + "an object.\n" );
+  var b = "Join" in Action;
+  write( "Action.Join is a " + (b ? "valid " : "invalid") + "member.\n" );
+
+  //-----------------------------------------------------------------------------------------
+  write( "---\n" );
+  write( "# 1\n" );
+  var defer = new Action.Defer( function()
+  {
+    write( "Defer executed." )
+  } );
+
+  function catcher()
+  {
+    write( "Join_Timeout catcher: timed_out = " + join.timed_out + ".\n" );
+  }
+
+  function finisher()
+  {
+    write( "Finished." );
+  }
+
+  try
+  {
+    var join = new Action.Join_Timeout( defer, 10 );
+    join.go( finisher, catcher );
+  }
+  catch ( e )
+  {
+    write( "Exception: " + e.message );
+  }
+
+}
+