Make Analyzer, VM and dart2js accept URI strings as part-of library identifier.

R=brianwilkerson@google.com, floitsch@google.com, hausner@google.com, johnniwinther@google.com, sigmund@google.com

Review-Url: https://codereview.chromium.org/2640853005 .

pkg/analyzer/lib/src/dart/analysis/library_analyzer.dart

@@ -474,7 +474,8 @@ class LibraryAnalyzer {
       }
     }
 
-    if (hasPartDirective && libraryNameNode == null) {
+    if (hasPartDirective && libraryNameNode == null &&
+        !_context.analysisOptions.enableUriInPartOf) {
       libraryErrorReporter.reportErrorForOffset(
           ResolverErrorCode.MISSING_LIBRARY_DIRECTIVE_WITH_PART, 0, 0);
     }

pkg/analyzer/lib/src/generated/engine.dart

@@ -1422,7 +1422,7 @@ class AnalysisOptionsImpl implements AnalysisOptions {
   List<String> _excludePatterns;
 
   @override
-  bool enableUriInPartOf = false;
+  bool enableUriInPartOf = true;
 
   @override
   bool generateImplicitErrors = true;
@@ -1686,7 +1686,7 @@ class AnalysisOptionsImpl implements AnalysisOptions {
     enableStrictCallChecks = false;
     enableSuperMixins = false;
     enableTiming = false;
-    enableUriInPartOf = false;
+    enableUriInPartOf = true;
     _errorProcessors = null;
     _excludePatterns = null;
     finerGrainedInvalidation = false;

pkg/analyzer/lib/src/generated/parser.dart

@@ -208,7 +208,7 @@ class Parser {
    * A flag indicating whether the parser is to allow URI's in part-of
    * directives.
    */
-  bool _enableUriInPartOf = false;
+  bool _enableUriInPartOf = true;
 
   /**
    * A flag indicating whether parser is to parse function bodies.

pkg/analyzer/lib/src/summary/summarize_ast.dart

@@ -1368,7 +1368,7 @@ class _SummarizeAstVisitor extends RecursiveAstVisitor {
 
   @override
   void visitPartOfDirective(PartOfDirective node) {
-    isCoreLibrary = node.libraryName.name == 'dart.core';
+    isCoreLibrary = node.libraryName?.name == 'dart.core';
     isPartOf = true;
   }
 

pkg/analyzer/lib/src/task/dart.dart

@@ -1626,7 +1626,8 @@ class BuildLibraryElementTask extends SourceBasedAnalysisTask {
         }
       }
     }
-    if (hasPartDirective && libraryNameNode == null) {
+    if (hasPartDirective && libraryNameNode == null &&
+        !context.analysisOptions.enableUriInPartOf) {
       errors.add(new AnalysisError(librarySource, 0, 0,
           ResolverErrorCode.MISSING_LIBRARY_DIRECTIVE_WITH_PART));
     }

pkg/analyzer/test/generated/parser_test.dart

@@ -3419,7 +3419,8 @@ class Foo {
 
   void test_nonIdentifierLibraryName_partOf() {
     CompilationUnit unit = parseCompilationUnit(
-        "part of 'lib';", [ParserErrorCode.NON_IDENTIFIER_LIBRARY_NAME]);
+        "part of 3;", [ParserErrorCode.MISSING_NAME_IN_PART_OF_DIRECTIVE,
+                       ParserErrorCode.UNEXPECTED_TOKEN]);
     expect(unit, isNotNull);
   }
 

pkg/analyzer/test/src/context/context_test.dart

@@ -766,8 +766,13 @@ library lib;
     Source partSource = addSource("/part.dart", "part of 'lib';");
     context.parseCompilationUnit(librarySource);
     List<AnalysisError> errors = context.computeErrors(partSource);
-    expect(errors, isNotNull);
-    expect(errors.length > 0, isTrue);
+    if (context.analysisOptions.enableUriInPartOf) {
+      // TODO(28522)
+      // Should report that 'lib' isn't the correct URI.
+    } else {
+      expect(errors, isNotNull);
+      expect(errors.length > 0, isTrue);
+    }
   }
 
   void test_computeErrors_dart_some() {

pkg/analyzer/test/src/dart/analysis/driver_test.dart

@@ -414,9 +414,14 @@ part of lib;
 
     AnalysisResult libResult = await driver.getResult(lib);
     List<AnalysisError> errors = libResult.errors;
-    expect(errors, hasLength(1));
-    expect(errors[0].errorCode,
-        ResolverErrorCode.MISSING_LIBRARY_DIRECTIVE_WITH_PART);
+    if (libResult.unit.element.context.analysisOptions.enableUriInPartOf) {
+      // TODO(28522): Should cause an error for wrong library name.
+      expect(errors, hasLength(0));
+    } else {
+        expect(errors, hasLength(1));
+        expect(errors[0].errorCode,
+            ResolverErrorCode.MISSING_LIBRARY_DIRECTIVE_WITH_PART);
+    }
   }
 
   test_analyze_resolveDirectives_error_partOfDifferentLibrary_byName() async {

pkg/analyzer/test/src/task/dart_test.dart

@@ -870,8 +870,37 @@ part of my_lib;
 part of my_lib;
 '''
     });
-    _assertErrorsWithCodes(
-        [ResolverErrorCode.MISSING_LIBRARY_DIRECTIVE_WITH_PART]);
+    if (context.analysisOptions.enableUriInPartOf) {
+      // TODO(28522)
+      // Should report that names are wrong.
+    } else {
+      _assertErrorsWithCodes(
+          [ResolverErrorCode.MISSING_LIBRARY_DIRECTIVE_WITH_PART]);
+      AnalysisError error = errorListener.errors[0];
+    }
+  }
+
+  test_perform_error_missingLibraryDirectiveWithPart_noCommon() {
+    _performBuildTask({
+      '/lib.dart': '''
+part 'partA.dart';
+part 'partB.dart';
+''',
+      '/partA.dart': '''
+part of libA;
+        ''',
+      '/partB.dart': '''
+part of libB;
+'''
+    });
+    if (context.analysisOptions.enableUriInPartOf) {
+      // TODO(28522)
+      // Should report that names are wrong.
+    } else {
+      _assertErrorsWithCodes(
+          [ResolverErrorCode.MISSING_LIBRARY_DIRECTIVE_WITH_PART]);
+      AnalysisError error = errorListener.errors[0];
+    }
   }
 
   test_perform_error_partDoesNotExist() {

pkg/compiler/lib/src/diagnostics/messages.dart

@@ -292,6 +292,7 @@ enum MessageKind {
   LIBRARY_NOT_FOUND,
   LIBRARY_NOT_SUPPORTED,
   LIBRARY_TAG_MUST_BE_FIRST,
+  LIBRARY_URI_MISMATCH,
   MAIN_HAS_PART_OF,
   MAIN_NOT_A_FUNCTION,
   MAIN_WITH_EXTRA_PARAMETER,
@@ -2073,6 +2074,26 @@ main() {}
 """,
               'part.dart': """
 part of lib.bar;
+"""
+            }
+          ]),
+
+      MessageKind.LIBRARY_URI_MISMATCH: const MessageTemplate(
+          MessageKind.LIBRARY_URI_MISMATCH,
+          "Expected URI of library '#{libraryUri}'.",
+          howToFix: "Try changing the directive to 'part of "
+                    "\"#{libraryUri}\";'.",
+          examples: const [
+            const {
+              'main.dart': """
+library lib.foo;
+
+part 'part.dart';
+
+main() {}
+""",
+              'part.dart': """
+part of "main.dart";
 """
             }
           ]),

pkg/compiler/lib/src/elements/modelx.dart

@@ -767,6 +767,20 @@ class CompilationUnitElementX extends ElementX
     }
     partTag = tag;
     LibraryName libraryTag = library.libraryTag;
+
+    Expression libraryReference = tag.name;
+    if (libraryReference is LiteralString) {
+      // Name is a URI. Resolve and compare to library's URI.
+      String content = libraryReference.dartString.slowToString();
+      Uri uri = this.script.readableUri.resolve(content);
+      Uri expectedUri = library.canonicalUri;
+      if (uri != expectedUri) {
+        // Consider finding a relative URI reference for the error message.
+        reporter.reportWarningMessage(tag.name,
+            MessageKind.LIBRARY_URI_MISMATCH, {'libraryUri': expectedUri});
+      }
+      return;
+    }
     String actualName = tag.name.toString();
     if (libraryTag != null) {
       String expectedName = libraryTag.name.toString();

pkg/front_end/lib/src/fasta/parser/parser.dart

@@ -344,8 +344,13 @@ class Parser {
     assert(optional('part', token));
     assert(optional('of', token.next));
     Token partKeyword = token;
-    token = parseQualified(token.next.next, IdentifierContext.partName,
-        IdentifierContext.partNameContinuation);
+    token = token.next.next;
+    if (token.isIdentifier()) {
+      token = parseQualified(token, IdentifierContext.partName,
+            IdentifierContext.partNameContinuation);
+    } else {
+      token = parseLiteralStringOrRecoverExpression(token);
+    }
     Token semicolon = token;
     token = expect(';', token);
     listener.endPartOf(partKeyword, semicolon);

runtime/vm/parser.cc

@@ -6386,12 +6386,16 @@ void Parser::ParsePartHeader() {
     ReportError("'part of' expected");
   }
   ConsumeToken();
-  // The VM is not required to check that the library name matches the
-  // name of the current library, so we ignore it.
-  ExpectIdentifier("library name expected");
-  while (CurrentToken() == Token::kPERIOD) {
-    ConsumeToken();
-    ExpectIdentifier("malformed library name");
+  // The VM is not required to check that the library name or URI matches the
+  // name or URI of the current library, so we ignore them.
+  if (CurrentToken() == Token::kSTRING) {
+    ParseStringLiteral(false);
+  } else {
+    ExpectIdentifier("library name expected");
+    while (CurrentToken() == Token::kPERIOD) {
+      ConsumeToken();
+      ExpectIdentifier("malformed library name");
+    }
   }
   ExpectSemicolon();
 }

tests/language/part_of_uri2_part.dart

@@ -0,0 +1,9 @@
+// Copyright (c) 2017, 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.
+
+part of "part_of_uri2_test.dart";
+
+// Refer to declaration in library and other part.
+const bar1 = "part1";
+const baz1 = "$foo${bar2}1";

tests/language/part_of_uri2_part2.dart

@@ -0,0 +1,9 @@
+// Copyright (c) 2017, 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.
+
+part of part_of_uri2;
+
+// Refer to declaration in library and other part.
+const bar2 = "part2";
+const baz2 = "$foo${bar1}2";

tests/language/part_of_uri2_test.dart

@@ -0,0 +1,15 @@
+// Copyright (c) 2017, 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.
+
+library part_of_uri2;
+
+part "part_of_uri2_part.dart";  // declares bar1, baz1, uses URI.
+part "part_of_uri2_part2.dart";  // declares bar2, baz2, uses id.
+
+const foo = 'foo';
+const qux = "$baz1$baz2";
+
+main() {
+  if (!identical(qux, "foopart21foopart12")) throw "Fail: $qux";
+}

tests/language/part_of_uri_part.dart

@@ -0,0 +1,9 @@
+// Copyright (c) 2017, 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.
+
+part of "part_of_uri_test.dart";
+
+// Refer to declaration in library and other part.
+const bar1 = "part1";
+const baz1 = "$foo${bar2}1";

tests/language/part_of_uri_part2.dart

@@ -0,0 +1,9 @@
+// Copyright (c) 2017, 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.
+
+part of "part_of_uri_test.dart";
+
+// Refer to declaration in library and other part.
+const bar2 = "part2";
+const baz2 = "$foo${bar1}2";

tests/language/part_of_uri_test.dart

@@ -0,0 +1,14 @@
+// Copyright (c) 2017, 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.
+
+// No library declaration
+part "part_of_uri_part.dart";  // declares bar1, baz1
+part "part_of_uri_part2.dart";  // declares bar2, baz2
+
+const foo = 'foo';
+const qux = "$baz1$baz2";
+
+main() {
+  if (!identical(qux, "foopart21foopart12")) throw "Fail: $qux";
+}