Implement part directive

runtime/vm/parser.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 "vm/parser.h"
 
 #include "vm/bigint_operations.h"
 #include "vm/class_finalizer.h"
 #include "vm/compiler.h"
 #include "vm/compiler_stats.h"
@@ skipping 4253 matching lines @@
   } else if (IsLiteral("export")) {
     ErrorMsg("export clause not yet supported");
   } else {
     ErrorMsg("unreachable");
     UNREACHABLE();
   }
 }
 
 
 void Parser::ParseLibraryPart() {
-  ErrorMsg("library part definitions not implemented");
+  const intptr_t source_pos = TokenPos();
+  ConsumeToken();  // Consume "part".
+  if (CurrentToken() != Token::kSTRING) {
+    ErrorMsg("url expected");
+  }
+  const String& url = *CurrentLiteral();
+  ConsumeToken();
+  ExpectSemicolon();
+  Dart_Handle handle =
+      CallLibraryTagHandler(kCanonicalizeUrl, source_pos, url);
+  const String& canon_url = String::CheckedHandle(Api::UnwrapHandle(handle));
+  CallLibraryTagHandler(kSourceTag, source_pos, canon_url);
 }
 
 
 void Parser::ParseLibraryDefinition() {
   TRACE_PARSER("ParseLibraryDefinition");
 
   // Handle the script tag.
   if (CurrentToken() == Token::kSCRIPTTAG) {
     // Nothing to do for script tags except to skip them.
     ConsumeToken();
@@ skipping 5375 matching lines @@
 void Parser::SkipQualIdent() {
   ASSERT(IsIdentifier());
   ConsumeToken();
   if (CurrentToken() == Token::kPERIOD) {
     ConsumeToken();  // Consume the kPERIOD token.
     ExpectIdentifier("identifier expected after '.'");
   }
 }
 
 }  // namespace dart