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/*
* Copyright (c) 2013, 2014 QNX Software Systems and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*/
package org.eclipse.cdt.internal.qt.core.pdom;
import org.eclipse.cdt.core.dom.ast.IASTFileLocation;
import org.eclipse.cdt.core.dom.ast.IASTName;
import org.eclipse.cdt.core.dom.ast.IASTNameOwner;
import org.eclipse.cdt.core.dom.ast.IBinding;
import org.eclipse.cdt.core.index.IIndexName;
import org.eclipse.cdt.internal.core.index.IIndexFragmentBinding;
import org.eclipse.cdt.internal.core.index.IIndexFragmentName;
import org.eclipse.cdt.internal.core.pdom.dom.IPDOMIterator;
import org.eclipse.cdt.internal.core.pdom.dom.PDOMBinding;
import org.eclipse.cdt.internal.core.pdom.dom.PDOMName;
import org.eclipse.core.runtime.CoreException;
/**
* Some Qt elements are introduced with empty macro expansions. The Qt linkage handles this
* by creating a new name and then adding it as a reference to the C++ language element.
* This utility helps by containing that C++ name and the location of the Qt name.
*/
@SuppressWarnings("restriction")
public class ASTNameReference extends ASTDelegatedName {
private final IASTFileLocation location;
/**
* Create and return a name that will reference the given name.
*/
public ASTNameReference(IASTName name) {
super(name);
this.location = name.getFileLocation();
}
/**
* Create and return a name that will reference the given name from the given location.
*/
public ASTNameReference(IASTName name, IASTFileLocation location) {
super(name);
this.location = location;
}
/**
* Find and return the Qt binding that annotates the given PDOMBinding. E.g., if the input binding
* is an instance of PDOMCPPClassType, then this method will return the QtPDOMQObject that was created
* from that class (or null if there is no such Qt element).
* <p>
* This is implemented by creating an ASTNameReference within the Qt element binding's definition. That
* name is added as reference from the C++ PDOM binding.
*/
public static <T extends QtPDOMBinding> T findFromBinding(Class<T> cls, PDOMBinding binding) throws CoreException {
if (binding == null)
return null;
// Look for external references to the binding.
IPDOMIterator<PDOMName> pdomIterator = binding.getExternalReferences();
while(pdomIterator.hasNext()) {
PDOMName extRef = pdomIterator.next();
IIndexName caller = extRef.getEnclosingDefinition();
if (caller instanceof IIndexFragmentName) {
IIndexFragmentBinding extRefBinding = ((IIndexFragmentName) caller).getBinding();
if (cls.isAssignableFrom(extRefBinding.getClass()))
return cls.cast(extRefBinding);
}
}
return null;
}
@Override
public IBinding resolveBinding() {
if (binding == null)
binding = delegate.resolveBinding();
return binding;
}
@Override
public IASTFileLocation getFileLocation() {
return location;
}
@Override
public boolean isReference() {
return true;
}
@Override
public boolean isDefinition() {
return false;
}
@Override
public boolean isDeclaration() {
return false;
}
@Override
public int getRoleOfName(boolean allowResolution) {
return IASTNameOwner.r_reference;
}
}
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