Examples of com.google.dart.engine.internal.constant.ConstantVisitor

Package com.google.dart.engine.internal.constant

Examples of com.google.dart.engine.internal.constant.ConstantVisitor

com.google.dart.engine.internal.constant.ConstantVisitor
Instances of the class {@code ConstantVisitor} evaluate constant expressions to produce theircompile-time value. According to the Dart Language Specification:
A constant expression is one of the following:
- A literal number.
- A literal boolean.
- A literal string where any interpolated expression is a compile-time constant that evaluates to a numeric, string or boolean value or to null.
- A literal symbol.
- null.
- A qualified reference to a static constant variable.
- An identifier expression that denotes a constant variable, class or type alias.
- A constant constructor invocation.
- A constant list literal.
- A constant map literal.
- A simple or qualified identifier denoting a top-level function or a static method.
- A parenthesized expression (e) where e is a constant expression.
- An expression of the form identical(e₁, e₂) where e₁ and e₂ are constant expressions and identical() is statically bound to the predefined dart function identical() discussed above.
- An expression of one of the forms e₁ == e₂ or e₁ != e₂ where e₁ and e₂ are constant expressions that evaluate to a numeric, string or boolean value.
- An expression of one of the forms !e, e₁ && e₂ or e₁ || e₂, where e, e1 and e2 are constant expressions that evaluate to a boolean value.
- An expression of one of the forms ~e, e₁ ^ e₂, e₁ & e₂, e₁ | e₂, e₁ >> e₂ or e₁ << e₂, where e, e₁ and e₂ are constant expressions that evaluate to an integer value or to null.
- An expression of one of the forms -e, e₁ + e₂, e₁ - e₂, e₁ * e₂, e₁ / e₂, e₁ ~/ e₂, e₁ > e₂, e₁ < e₂, e₁ >= e₂, e₁ <= e₂ or e₁ % e₂, where e, e₁ and e₂ are constant expressions that evaluate to a numeric value or to null.
- An expression of the form e₁ ? e₂ : e₃ where e₁, e₂ and e₃ are constant expressions, and e₁ evaluates to a boolean value.

    this.source = source;
    this.typeProvider = typeProvider;
  }


  public EvaluationResult evaluate(Expression expression) {
    EvaluationResultImpl result = expression.accept(new ConstantVisitor(typeProvider));
    if (result instanceof ValidResult) {
      return EvaluationResult.forValue(((ValidResult) result).getValue());
    }
    ArrayList<AnalysisError> errors = new ArrayList<AnalysisError>();
    for (ErrorResult.ErrorData data : ((ErrorResult) result).getErrorData()) {

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                key,
                type.getDisplayName());
          }
        }
      } else {
        EvaluationResultImpl result = key.accept(new ConstantVisitor(typeProvider));
        if (result instanceof ValidResult) {
          DartObject value = ((ValidResult) result).getValue();
          if (keys.contains(value)) {
            invalidKeys.add(key);
          } else {

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   * @param expression the expression to be validated
   * @param errorCode the error code to be used if the expression is not a compile time constant
   * @return the value of the compile time constant
   */
  private EvaluationResultImpl validate(Expression expression, ErrorCode errorCode) {
    EvaluationResultImpl result = expression.accept(new ConstantVisitor(typeProvider));
    reportErrors(result, errorCode);
    return result;
  }

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        FieldDeclaration fieldDeclaration = (FieldDeclaration) member;
        if (!fieldDeclaration.isStatic()) {
          for (VariableDeclaration variableDeclaration : fieldDeclaration.getFields().getVariables()) {
            Expression initializer = variableDeclaration.getInitializer();
            if (initializer != null) {
              EvaluationResultImpl result = initializer.accept(new ConstantVisitor(typeProvider));
              if (!(result instanceof ValidResult)) {
                errorReporter.reportErrorForNode(
                    CompileTimeErrorCode.CONST_CONSTRUCTOR_WITH_FIELD_INITIALIZED_BY_NON_CONST,
                    errorSite,
                    variableDeclaration.getName().getName());

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   *          considered as a valid potentially constant expressions
   * @param expression the expression to validate
   */
  private void validateInitializerExpression(final ParameterElement[] parameterElements,
      Expression expression) {
    EvaluationResultImpl result = expression.accept(new ConstantVisitor(typeProvider) {
      @Override
      public EvaluationResultImpl visitSimpleIdentifier(SimpleIdentifier node) {
        Element element = node.getStaticElement();
        for (ParameterElement parameterElement : parameterElements) {
          if (parameterElement == element && parameterElement != null) {

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Related Classes of com.google.dart.engine.internal.constant.ConstantVisitor

com.google.dart.engine.ast.Expression

com.google.dart.engine.ast.SimpleIdentifier

com.google.dart.engine.constant.ConstantEvaluator

com.google.dart.engine.element.Element

com.google.dart.engine.element.ExecutableElement

com.google.dart.engine.element.FunctionElement

com.google.dart.engine.element.LibraryElement

com.google.dart.engine.element.PropertyAccessorElement

com.google.dart.engine.internal.element.VariableElementImpl

com.google.dart.engine.internal.object.DartObjectImpl

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