Minor restructure some of the builtin library processing code

bin/builtin.cc

Index: bin/builtin.cc
===================================================================
--- bin/builtin.cc	(revision 8133)
+++ bin/builtin.cc	(working copy)
@@ -9,6 +9,18 @@
 #include "bin/builtin.h"
 #include "bin/dartutils.h"
 
+
+Builtin::builtin_lib_props Builtin::builtin_libraries_[] = {
+  /*      url_                    source_       has_natives_  */
+  { DartUtils::kBuiltinLibURL, builtin_source_, true  },
+  { DartUtils::kJsonLibURL,    json_source_,    false },
+  { DartUtils::kUriLibURL,     uri_source_,     false },
+  { DartUtils::kCryptoLibURL,  crypto_source_,  false },
+  { DartUtils::kIOLibURL,      io_source_,      true  },
+  { DartUtils::kUtfLibURL,     utf_source_,     false }
+};
+
+
 static void ImportBuiltinLibIntoLib(
     const char* liburl, Dart_Handle builtin_lib) {
   Dart_Handle url = Dart_NewString(liburl);
@@ -19,75 +31,35 @@
 
 
 Dart_Handle Builtin::Source(BuiltinLibraryId id) {
-  Dart_Handle source;
-  switch (id) {
-    case kBuiltinLibrary:
-      source = Dart_NewString(Builtin::builtin_source_);
-      break;
-    case kCryptoLibrary:
-      source = Dart_NewString(Builtin::crypto_source_);
-      break;
-    case kIOLibrary:
-      source = Dart_NewString(Builtin::io_source_);
-      break;
-    case kJsonLibrary:
-      source = Dart_NewString(Builtin::json_source_);
-      break;
-    case kUriLibrary:
-      source = Dart_NewString(Builtin::uri_source_);
-      break;
-    case kUtfLibrary:
-      source = Dart_NewString(Builtin::utf_source_);
-      break;
-    default:
-      return Dart_Error("Unknown builtin source requested.");
-  }
-  return source;
+  ASSERT((sizeof(builtin_libraries_) / sizeof(builtin_lib_props)) ==
+         kInvalidLibrary);
+  ASSERT(id >= kBuiltinLibrary && id < kInvalidLibrary);
+  return Dart_NewString(builtin_libraries_[id].source_);
 }
 
 
 void Builtin::SetupLibrary(Dart_Handle library, BuiltinLibraryId id) {
-  if ((id == kCryptoLibrary) ||
-      (id == kJsonLibrary) ||
-      (id == kUriLibrary) ||
-      (id == kUtfLibrary)) {
-    // No native resolver for these pure Dart libraries.
-    return;
-  } else if (id == kBuiltinLibrary) {
+  ASSERT((sizeof(builtin_libraries_) / sizeof(builtin_lib_props)) ==
+         kInvalidLibrary);
+  ASSERT(id >= kBuiltinLibrary && id < kInvalidLibrary);
+  if (builtin_libraries_[id].has_natives_) {
+    // Setup the native resolver for built in library functions.
+    DART_CHECK_VALID(Dart_SetNativeResolver(library, NativeLookup));
+  }
+  if (id == kBuiltinLibrary) {
     // Import the builtin library into the core and isolate libraries.
     ImportBuiltinLibIntoLib(DartUtils::kCoreLibURL, library);
     ImportBuiltinLibIntoLib(DartUtils::kCoreImplLibURL, library);
     ImportBuiltinLibIntoLib(DartUtils::kIsolateLibURL, library);
   }
-  // Setup the native resolver for built in library functions.
-  DART_CHECK_VALID(Dart_SetNativeResolver(library, NativeLookup));
 }
 
 
 Dart_Handle Builtin::LoadLibrary(BuiltinLibraryId id) {
-  Dart_Handle url;
-  switch (id) {
-    case kBuiltinLibrary:
-      url = Dart_NewString(DartUtils::kBuiltinLibURL);
-      break;
-    case kCryptoLibrary:
-      url = Dart_NewString(DartUtils::kCryptoLibURL);
-      break;
-    case kIOLibrary:
-      url = Dart_NewString(DartUtils::kIOLibURL);
-      break;
-    case kJsonLibrary:
-      url = Dart_NewString(DartUtils::kJsonLibURL);
-      break;
-    case kUriLibrary:
-      url = Dart_NewString(DartUtils::kUriLibURL);
-      break;
-    case kUtfLibrary:
-      url = Dart_NewString(DartUtils::kUtfLibURL);
-      break;
-    default:
-      return Dart_Error("Unknown builtin library requested.");
-  }
+  ASSERT((sizeof(builtin_libraries_) / sizeof(builtin_lib_props)) ==
+         kInvalidLibrary);
+  ASSERT(id >= kBuiltinLibrary && id < kInvalidLibrary);
+  Dart_Handle url = Dart_NewString(builtin_libraries_[id].url_);
   Dart_Handle library = Dart_LookupLibrary(url);
   if (Dart_IsError(library)) {
     library = Dart_LoadLibrary(url, Source(id));