Add native extensions to the Dart shell, on the linux platform.

runtime/bin/main.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include <stdlib.h>
 #include <string.h>
 #include <stdio.h>
 
 #include "include/dart_api.h"
 #include "include/dart_debugger_api.h"
 
 #include "bin/builtin.h"
 #include "bin/dartutils.h"
 #include "bin/eventhandler.h"
+#include "bin/extensions.h"
 #include "bin/file.h"
 #include "bin/platform.h"
 #include "bin/process.h"
 #include "platform/globals.h"
 
 // snapshot_buffer points to a snapshot if we link in a snapshot otherwise
 // it is initialized to NULL.
 extern const uint8_t* snapshot_buffer;
 
 
@@ skipping 225 matching lines @@
   }
   if (!Dart_IsString8(url)) {
     return Dart_Error("url is not a string");
   }
   const char* url_string = NULL;
   Dart_Handle result = Dart_StringToCString(url, &url_string);
   if (Dart_IsError(result)) {
     return Dart_Error("accessing url characters failed");
   }
   bool is_dart_scheme_url = DartUtils::IsDartSchemeURL(url_string);
+  bool is_dart_extension_url = DartUtils::IsDartExtensionSchemeURL(url_string);
   if (tag == kCanonicalizeUrl) {
     // If this is a Dart Scheme URL then it is not modified as it will be
     // handled by the VM internally.
-    if (is_dart_scheme_url) {
+    if (is_dart_scheme_url || is_dart_extension_url) {
       return url;
     }
     // Create a canonical path based on the including library and current url.
     return DartUtils::CanonicalizeURL(NULL, library, url_string);
   }
   if (is_dart_scheme_url) {
     ASSERT(tag == kImportTag);
     // Handle imports of other built-in libraries present in the SDK.
     if (DartUtils::IsDartIOLibURL(url_string)) {
       return Builtin::LoadLibrary(Builtin::kIOLibrary);
     } else if (DartUtils::IsDartJsonLibURL(url_string)) {
       return Builtin::LoadLibrary(Builtin::kJsonLibrary);
     } else if (DartUtils::IsDartUriLibURL(url_string)) {
       return Builtin::LoadLibrary(Builtin::kUriLibrary);
     } else if (DartUtils::IsDartUtf8LibURL(url_string)) {
       return Builtin::LoadLibrary(Builtin::kUtf8Library);
     } else {
       return Dart_Error("Do not know how to load '%s'", url_string);
     }
+  } else if (is_dart_extension_url) {
+    if (tag != kImportTag) {
+      return Dart_Error("Dart extensions must use import: '%s'", url_string);
+    }
+    return Extensions::LoadExtension(url_string, library);
   }
   result = DartUtils::LoadSource(NULL,
                                  library,
                                  url,
                                  tag,
                                  url_string,
                                  import_map);
   if (!Dart_IsError(result) && (tag == kImportTag)) {
     Builtin::ImportLibrary(result, Builtin::kBuiltinLibrary);
   }
@@ skipping 324 matching lines @@
   DumpPprofSymbolInfo();
   // Shutdown the isolate.
   Dart_ShutdownIsolate();
   // Terminate event handler.
   EventHandler::Terminate();
   // Terminate process exit-code handler.
   Process::TerminateExitCodeHandler();
 
   return 0;
 }