Improve output: distinguish between failed assertions (failures) and unexpected exceptions (errors), and print a filtered stack trace for any exception.

webapp/web/src/hostenv_jsc.js

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+/*
+	Copyright (c) 2004-2006, The Dojo Foundation
+	All Rights Reserved.
+
+	Licensed under the Academic Free License version 2.1 or above OR the
+	modified BSD license. For more information on Dojo licensing, see:
+
+		http://dojotoolkit.org/community/licensing.shtml
+*/
+
+/*
+ * JScript .NET jsc
+ *
+ */
+
+dojo.hostenv.name_ = 'jsc';
+
+// Sanity check this is the right hostenv.
+// See the Rotor source code jscript/engine/globalobject.cs for what globals
+// are available.
+if((typeof ScriptEngineMajorVersion != 'function')||(ScriptEngineMajorVersion() < 7)){
+	dojo.raise("attempt to use JScript .NET host environment with inappropriate ScriptEngine"); 
+}
+
+// for more than you wanted to know about why this import is required even if
+// we fully qualify all symbols, see
+// http://groups.google.com/groups?th=f050c7aeefdcbde2&rnum=12
+import System;
+
+dojo.hostenv.getText = function(uri){
+	if(!System.IO.File.Exists(uri)){
+		// dojo.raise("No such file '" + uri + "'");
+		return 0;
+	}
+	var reader = new System.IO.StreamReader(uri);
+	var contents : String = reader.ReadToEnd();
+	return contents;
+}
+
+dojo.hostenv.loadUri = function(uri){
+	var contents = this.getText(uri);
+	if(!contents){
+		dojo.raise("got no back contents from uri '" + uri + "': " + contents);
+	}
+	// TODO: in JScript .NET, eval will not affect the symbol table of the current code?
+	var value = dj_eval(contents);
+	dojo.debug("jsc eval of contents returned: ", value);
+	return 1;
+
+	// for an example doing runtime code compilation, see:
+	// http://groups.google.com/groups?selm=eQ1aeciCBHA.1644%40tkmsftngp05&rnum=6
+	// Microsoft.JScript or System.CodeDom.Compiler ?
+	// var engine = new Microsoft.JScript.Vsa.VsaEngine()
+	// what about loading a js file vs. a dll?
+	// GetObject("script:" . uri);
+}
+
+/* The System.Environment object is useful:
+    print ("CommandLine='" + System.Environment.CommandLine + "' " +
+	   "program name='" + System.Environment.GetCommandLineArgs()[0] + "' " +
+	   "CurrentDirectory='" + System.Environment.CurrentDirectory + "' " +
+	   "StackTrace='" + System.Environment.StackTrace + "'");
+*/
+
+// same as System.Console.WriteLine
+// sigh; Rotor treats symbol "print" at parse time without actually putting it
+// in the builtin symbol table.
+// Note that the print symbol is not available if jsc is run with the "/print-"
+// option.
+dojo.hostenv.println = function(s){
+	print(s); // = print
+}
+
+dojo.hostenv.getLibraryScriptUri = function(){
+	return System.Environment.GetCommandLineArgs()[0];
+}