Use configurations and declared variables to select import/export URIs during prelinking.

pkg/analyzer/test/src/summary/resynthesize_test.dart

 // Copyright (c) 2015, 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 test.src.serialization.elements_test;
 
 import 'dart:convert';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/constant/value.dart';
@@ skipping 3012 matching lines @@
     addLibrarySource('/a.dart', 'class C {}');
     checkLibrary('export "a.dart";');
   }
 
   test_export_class_type_alias() {
     addLibrarySource(
         '/a.dart', 'class C {} exends _D with _E; class _D {} class _E {}');
     checkLibrary('export "a.dart";');
   }
 
+  test_export_configurations_useDefault() {
+    context.declaredVariables.define('dart.library.io', 'false');
+    addLibrarySource('/foo.dart', 'class A {}');
+    addLibrarySource('/foo_io.dart', 'class A {}');
+    addLibrarySource('/foo_html.dart', 'class A {}');
+    LibraryElementImpl library = checkLibrary(r'''
+export 'foo.dart'
+  if (dart.library.io) 'foo_io.dart'
+  if (dart.library.html) 'foo_html.dart';
+''');
+    expect(library.exports[0].uri, 'foo.dart');
+    expect(library.exports[0].exportedLibrary.source.shortName, 'foo.dart');
+  }
+
+  test_export_configurations_useFirst() {
+    context.declaredVariables.define('dart.library.io', 'true');
+    context.declaredVariables.define('dart.library.html', 'true');
+    addLibrarySource('/foo.dart', 'class A {}');
+    addLibrarySource('/foo_io.dart', 'class A {}');
+    addLibrarySource('/foo_html.dart', 'class A {}');
+    LibraryElementImpl library = checkLibrary(r'''
+export 'foo.dart'
+  if (dart.library.io) 'foo_io.dart'
+  if (dart.library.html) 'foo_html.dart';
+''');
+    expect(library.exports[0].uri, 'foo_io.dart');
+    expect(library.exports[0].exportedLibrary.source.shortName, 'foo_io.dart');
+  }
+
+  test_export_configurations_useSecond() {
+    context.declaredVariables.define('dart.library.io', 'false');
+    context.declaredVariables.define('dart.library.html', 'true');
+    addLibrarySource('/foo.dart', 'class A {}');
+    addLibrarySource('/foo_io.dart', 'class A {}');
+    addLibrarySource('/foo_html.dart', 'class A {}');
+    LibraryElementImpl library = checkLibrary(r'''
+export 'foo.dart'
+  if (dart.library.io) 'foo_io.dart'
+  if (dart.library.html) 'foo_html.dart';
+''');
+    ExportElement export = library.exports[0];
+    expect(export.uri, 'foo_html.dart');
+    expect(export.exportedLibrary.source.shortName, 'foo_html.dart');
+  }
+
   test_export_function() {
     addLibrarySource('/a.dart', 'f() {}');
     checkLibrary('export "a.dart";');
   }
 
   test_export_getter() {
     addLibrarySource('/a.dart', 'get f() => null;');
     checkLibrary('export "a.dart";');
   }
 
@@ skipping 30 matching lines @@
   test_export_variable_const() {
     addLibrarySource('/a.dart', 'const x = 0;');
     checkLibrary('export "a.dart";');
   }
 
   test_export_variable_final() {
     addLibrarySource('/a.dart', 'final x = 0;');
     checkLibrary('export "a.dart";');
   }
 
+  test_exportImport_configurations_useDefault() {
+    context.declaredVariables.define('dart.library.io', 'false');
+    addLibrarySource('/foo.dart', 'class A {}');
+    addLibrarySource('/foo_io.dart', 'class A {}');
+    addLibrarySource('/foo_html.dart', 'class A {}');
+    addLibrarySource(
+        '/bar.dart',
+        r'''
+export 'foo.dart'
+  if (dart.library.io) 'foo_io.dart'
+  if (dart.library.html) 'foo_html.dart';
+''');
+    LibraryElementImpl library = checkLibrary(r'''
+import 'bar.dart';
+class B extends A {}
+''');
+    var typeA = library.definingCompilationUnit.getType('B').supertype;
+    expect(typeA.element.source.shortName, 'foo.dart');
+  }
+
+  test_exportImport_configurations_useFirst() {
+    context.declaredVariables.define('dart.library.io', 'true');
+    context.declaredVariables.define('dart.library.html', 'true');
+    addLibrarySource('/foo.dart', 'class A {}');
+    addLibrarySource('/foo_io.dart', 'class A {}');
+    addLibrarySource('/foo_html.dart', 'class A {}');
+    addLibrarySource(
+        '/bar.dart',
+        r'''
+export 'foo.dart'
+  if (dart.library.io) 'foo_io.dart'
+  if (dart.library.html) 'foo_html.dart';
+''');
+    var library = checkLibrary(r'''
+import 'bar.dart';
+class B extends A {}
+''');
+    var typeA = library.definingCompilationUnit.getType('B').supertype;
+    expect(typeA.element.source.shortName, 'foo_io.dart');
+  }
+
   test_exports() {
     addLibrarySource('/a.dart', 'library a;');
     addLibrarySource('/b.dart', 'library b;');
     checkLibrary('export "a.dart"; export "b.dart";');
   }
 
   test_field_documented() {
     checkLibrary('''
 class C {
   /**
@@ skipping 294 matching lines @@
   }
 
   test_implicitTopLevelVariable_getterFirst() {
     checkLibrary('int get x => 0; void set x(int value) {}');
   }
 
   test_implicitTopLevelVariable_setterFirst() {
     checkLibrary('void set x(int value) {} int get x => 0;');
   }
 
+  test_import_configurations_useDefault() {
+    context.declaredVariables.define('dart.library.io', 'false');
+    addLibrarySource('/foo.dart', 'class A {}');
+    addLibrarySource('/foo_io.dart', 'class A {}');
+    addLibrarySource('/foo_html.dart', 'class A {}');
+    var library = checkLibrary(r'''
+import 'foo.dart'
+  if (dart.library.io) 'foo_io.dart'
+  if (dart.library.html) 'foo_html.dart';
+
+class B extends A {}
+''');
+    var typeA = library.definingCompilationUnit.getType('B').supertype;
+    expect(typeA.element.source.shortName, 'foo.dart');
+  }
+
+  test_import_configurations_useFirst() {
+    context.declaredVariables.define('dart.library.io', 'true');
+    context.declaredVariables.define('dart.library.html', 'true');
+    addLibrarySource('/foo.dart', 'class A {}');
+    addLibrarySource('/foo_io.dart', 'class A {}');
+    addLibrarySource('/foo_html.dart', 'class A {}');
+    var library = checkLibrary(r'''
+import 'foo.dart'
+  if (dart.library.io) 'foo_io.dart'
+  if (dart.library.html) 'foo_html.dart';
+
+class B extends A {}
+''');
+    var typeA = library.definingCompilationUnit.getType('B').supertype;
+    expect(typeA.element.source.shortName, 'foo_io.dart');
+  }
+
   test_import_deferred() {
     addLibrarySource('/a.dart', 'f() {}');
     checkLibrary('import "a.dart" deferred as p; main() { p.f(); }');
   }
 
   test_import_hide() {
     addLibrary('dart:async');
     checkLibrary('import "dart:async" hide Stream, Completer; Future f;');
   }
 
@@ skipping 1274 matching lines @@
       fail('Unexpectedly tried to get unlinked summary for $uri');
     }
     return serializedUnit;
   }
 
   @override
   bool hasLibrarySummary(String uri) {
     return true;
   }
 }