Add a public API for the results of constant evaluation

pkg/analyzer/test/src/task/dart_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.task.dart_test;
 
 import 'package:analyzer/src/context/cache.dart';
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/constant.dart';
 import 'package:analyzer/src/generated/element.dart';
@@ skipping 1249 matching lines @@
     CompilationUnit unit = _resolveSource(source);
     // Compute the constant value of the annotation on C.
     EvaluationResultImpl evaluationResult =
         computeClassAnnotation(source, unit, 'C');
     // And check that it has the expected value.
     expect(evaluationResult, isNotNull);
     expect(evaluationResult.value, isNotNull);
     expect(evaluationResult.value.type, isNotNull);
     expect(evaluationResult.value.type.name, 'D');
     expect(evaluationResult.value.fields, contains('value'));
-    expect(evaluationResult.value.fields['value'].intValue, 1);
+    expect(evaluationResult.value.fields['value'].toIntValue(), 1);
   }
 
   test_annotation_without_args() {
     Source source = newSource(
         '/test.dart',
         '''
 const x = 1;
 @x class C {}
 ''');
     // First compute the resolved unit for the source.
     CompilationUnit unit = _resolveSource(source);
     // Compute the constant value of the annotation on C.
     EvaluationResultImpl evaluationResult =
         computeClassAnnotation(source, unit, 'C');
     // And check that it has the expected value.
     expect(evaluationResult, isNotNull);
     expect(evaluationResult.value, isNotNull);
-    expect(evaluationResult.value.intValue, 1);
+    expect(evaluationResult.value.toIntValue(), 1);
   }
 
   test_circular_reference() {
     _checkCircularities(
         'x',
         ['y'],
         '''
 const x = y + 1;
 const y = x + 1;
 ''');
@@ skipping 36 matching lines @@
 
   test_dependency() {
     EvaluationResultImpl evaluationResult = _computeTopLevelVariableConstValue(
         'x',
         '''
 const x = y + 1;
 const y = 1;
 ''');
     expect(evaluationResult, isNotNull);
     expect(evaluationResult.value, isNotNull);
-    expect(evaluationResult.value.intValue, 2);
+    expect(evaluationResult.value.toIntValue(), 2);
   }
 
   test_external_const_factory() {
     EvaluationResultImpl evaluationResult = _computeTopLevelVariableConstValue(
         'x',
         '''
 const x = const C.foo();
 
 class C extends B {
   external const factory C.foo();
 }
 
 class B {}
 ''');
     expect(evaluationResult, isNotNull);
   }
 
   test_simple_constant() {
     EvaluationResultImpl evaluationResult = _computeTopLevelVariableConstValue(
         'x',
         '''
 const x = 1;
 ''');
     expect(evaluationResult, isNotNull);
     expect(evaluationResult.value, isNotNull);
-    expect(evaluationResult.value.intValue, 1);
+    expect(evaluationResult.value.toIntValue(), 1);
   }
 
   void _checkCircularities(
       String variableName, List<String> otherVariables, String content) {
     // Evaluating the first constant should produce an error.
     CompilationUnit unit = _resolveUnit(content);
     _expectCircularityError(_evaluateConstant(unit, variableName));
     // And all the other constants involved in the strongly connected component
     // should be set to the same error state.
     for (String otherVariableName in otherVariables) {
@@ skipping 2926 matching lines @@
   /**
    * Fill [errorListener] with [result] errors in the current [task].
    */
   void _fillErrorListener(ResultDescriptor<List<AnalysisError>> result) {
     List<AnalysisError> errors = task.outputs[result];
     expect(errors, isNotNull, reason: result.name);
     errorListener = new GatheringErrorListener();
     errorListener.addAll(errors);
   }
 }