Examples with IMPLEMENTS_KEYWORD org.eclipse.n4js.N4JSLanguageConstants.IMPLEMENTS_KEYWORD used on opensource projects

Example 1 with IMPLEMENTS_KEYWORD

use of org.eclipse.n4js.N4JSLanguageConstants.IMPLEMENTS_KEYWORD in project n4js by eclipse.

the class N4JSSyntaxValidator method checkClassDefinition.

/**
 * Checks that no "with" is used and that list of implemented interfaces is separated with commas and not with
 * keywords. These checks (with some warnings created instead of errors) should help the transition from roles to
 * interfaces. However, they may be useful later on as well, e.g., if an interface is manually refactored into a
 * class or vice versa.
 * <p>
 * Note that "with" is used in Dart for roles, so maybe it is useful to have a user-friendly message instead of a
 * parser error.
 */
@Check
public void checkClassDefinition(N4ClassDefinition n4ClassDefinition) {
    holdsCorrectOrderOfExtendsImplements(n4ClassDefinition);
    ICompositeNode node = NodeModelUtils.findActualNodeFor(n4ClassDefinition);
    ILeafNode keywordNode = findSecondLeafWithKeyword(n4ClassDefinition, "{", node, EXTENDS_KEYWORD, false);
    if (keywordNode != null) {
        TClass tclass = n4ClassDefinition.getDefinedTypeAsClass();
        if (tclass == null) {
            // avoid consequential errors
            return;
        }
        if (StreamSupport.stream(tclass.getImplementedInterfaceRefs().spliterator(), false).allMatch(superTypeRef -> superTypeRef.getDeclaredType() instanceof TInterface)) {
            List<? extends IdentifiableElement> interfaces = StreamSupport.stream(tclass.getImplementedInterfaceRefs().spliterator(), false).map(ref -> (TInterface) (ref.getDeclaredType())).collect(Collectors.toList());
            String message = getMessageForSYN_KW_EXTENDS_IMPLEMENTS_MIXED_UP(validatorMessageHelper.description(tclass), "extend", "interface" + (interfaces.size() > 1 ? "s " : " ") + validatorMessageHelper.names(interfaces), IMPLEMENTS_KEYWORD);
            addIssue(message, n4ClassDefinition, keywordNode.getTotalOffset(), keywordNode.getLength(), SYN_KW_EXTENDS_IMPLEMENTS_MIXED_UP);
        }
    }
}