package org.stjs.generator.check.expression;
import javax.lang.model.element.Element;
import javax.lang.model.element.TypeElement;
import org.stjs.generator.GenerationContext;
import org.stjs.generator.GeneratorConstants;
import org.stjs.generator.check.CheckContributor;
import org.stjs.generator.check.CheckVisitor;
import org.stjs.generator.javac.TreeUtils;
import org.stjs.generator.utils.JavaNodes;
import org.stjs.generator.writer.expression.MethodInvocationWriter;
import com.sun.source.tree.ClassTree;
import com.sun.source.tree.IdentifierTree;
import com.sun.source.tree.MethodInvocationTree;
/**
* this check verifies that you don't call a method from the outer type as in javaScript this scope is not accessible.
* @author acraciun
*/
public class MethodInvocationOuterScopeCheck implements CheckContributor<MethodInvocationTree> {
private void checkScope(Element methodElement, MethodInvocationTree tree, GenerationContext<Void> context) {
ClassTree enclosingClassTree = IdentifierAccessOuterScopeCheck.enclosingClassSkipAnonymousInitializer(context.getCurrentPath());
TypeElement currentScopeClassElement = TreeUtils.elementFromDeclaration(enclosingClassTree);
TypeElement methodOwnerElement = (TypeElement) methodElement.getEnclosingElement();
if (IdentifierAccessOuterScopeCheck.isOuterType(context, methodOwnerElement, currentScopeClassElement)) {
context.addError(tree, "In Javascript you cannot call methods or fields from the outer type. "
+ "You should define a variable var that=this outside your function definition and call the methods on this object");
}
}
@Override
public Void visit(CheckVisitor visitor, MethodInvocationTree tree, GenerationContext<Void> context) {
Element methodElement = TreeUtils.elementFromUse(tree);
if (JavaNodes.isStatic(methodElement)) {
// only instance methods
return null;
}
String name = MethodInvocationWriter.buildMethodName(tree);
if (GeneratorConstants.THIS.equals(name) || GeneratorConstants.SUPER.equals(name)) {
// this and super call are ok
return null;
}
if (!(tree.getMethodSelect() instanceof IdentifierTree)) {
// check for Outer.this check
return null;
}
checkScope(methodElement, tree, context);
return null;
}
}