package org.stjs.generator.plugin.java8.check.expression;
import javax.lang.model.element.Element;
import org.stjs.generator.GenerationContext;
import org.stjs.generator.check.CheckContributor;
import org.stjs.generator.check.CheckVisitor;
import org.stjs.generator.check.expression.IdentifierAccessOuterScopeCheck;
import org.stjs.generator.javac.TreeUtils;
import com.sun.source.tree.IdentifierTree;
import com.sun.source.tree.LambdaExpressionTree;
import com.sun.source.util.TreePath;
public class FieldAccessFromLambdaCheck implements CheckContributor<IdentifierTree> {
@Override
public Void visit(CheckVisitor visitor, IdentifierTree tree, GenerationContext<Void> context) {
Element fieldElement = TreeUtils.elementFromUse(tree);
if (!IdentifierAccessOuterScopeCheck.isRegularInstanceField(fieldElement, tree)) {
return null;
}
TreePath enclosingLambdaPath = TreeUtils.enclosingPathOfType(context.getCurrentPath(), LambdaExpressionTree.class);
if (enclosingLambdaPath != null) {
context.addError(
tree,
"In Javascript you cannot access a field from the outer type. "
+ "You should define a variable var that=this outside your lamda expression and use the property of this object. The field: "
+ tree);
}
return null;
}
}