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/*
* Copyright (c) 2014, 2015 QNX Software Systems and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*/
package org.eclipse.cdt.internal.qt.core;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import org.eclipse.cdt.core.dom.ast.IASTFunctionCallExpression;
import org.eclipse.cdt.core.dom.ast.IASTInitializerClause;
import org.eclipse.cdt.core.dom.ast.IASTNode;
import org.eclipse.cdt.core.dom.ast.IBasicType;
import org.eclipse.cdt.core.dom.ast.IEnumeration;
import org.eclipse.cdt.core.dom.ast.IType;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPClassType;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPFunction;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPParameter;
/**
* Extracts required information from FunctionCallExpressions that call
* QObject::connect. This implementation handles all overloads of QObject::connect
* except the QMetaMethod related ones. QMetaMethods cannot be statically analyzed
* so they are ignored.
* <p>
* The binding is found by identifying the overload and then looking at the appropriate
* parameters.
*/
public class QtFunctionCall {
private QtFunctionCall() {
}
/**
* Returns a collection of all Qt method references within the given function call. Returns
* null if there are no Qt method references.
*/
public static Collection<QtMethodReference> getReferences(IASTFunctionCallExpression call) {
ICPPFunction function = ASTUtil.resolveFunctionBinding(ICPPFunction.class, call);
if (function == null)
return null;
if (QtKeywords.is_QObject_connect(function))
return getReferencesInConnect(function, call);
if (QtKeywords.is_QObject_disconnect(function))
return getReferencesInDisconnect(function, call);
return null;
}
private static Collection<QtMethodReference> getReferencesInConnect(ICPPFunction function, IASTFunctionCallExpression call) {
if (function == null)
return null;
// There are 3 overloads of QObject::connect (Qt 4.8.4). They can be
// distinguished by examining
// the type of the forth parameter.
// connect( , , , const char *, )
// connect( , , , QMetaMethod&, )
// connect( , , , Qt::ConnectionType = )
ICPPParameter[] params = function.getParameters();
if (params.length < 4)
return null;
IASTInitializerClause[] args = call.getArguments();
IType type3 = ASTUtil.getBaseType(params[3].getType());
// static bool connect( const QObject *sender, const QMetaMethod &signal,
// const QObject *receiver, const QMetaMethod &method,
// Qt::ConnectionType type = Qt::AutoConnection )
if (QtKeywords.isQMetaMethod(type3)) {
// QMetaMethod cannot be statically analyzed.
return null;
}
// Otherwise find the signal and member parameters based on the overload.
QtMethodReference signal = null;
QtMethodReference member = null;
// static bool connect( const QObject *sender, const char *signal,
// const QObject *receiver, const char *member,
// Qt::ConnectionType = Qt::AutoConnection );
if (type3 instanceof IBasicType && ((IBasicType) type3).getKind() == IBasicType.Kind.eChar) {
signal = QtMethodReference.parse(call, ASTUtil.getBaseType(safeArgsAt(args, 0)), safeArgsAt(args, 1));
member = QtMethodReference.parse(call, ASTUtil.getBaseType(safeArgsAt(args, 2)), safeArgsAt(args, 3));
}
// inline bool connect( const QObject *sender, const char *signal,
// const char *member,
// Qt::ConnectionType type = Qt::AutoConnection ) const;
else if (type3 instanceof IEnumeration) {
signal = QtMethodReference.parse(call, ASTUtil.getBaseType(safeArgsAt(args, 0)), safeArgsAt(args, 1));
member = QtMethodReference.parse(call, ASTUtil.getReceiverType(call), safeArgsAt(args, 2));
}
return mergeNonNull(signal, member);
}
private static Collection<QtMethodReference> getReferencesInDisconnect(ICPPFunction function, IASTFunctionCallExpression call) {
if (function == null)
return null;
// There are 4 overloads of QObject::disconnect (Qt 4.8.4). They can be distinguished by examining
// the type of the second parameter. The number of parameters is used to disambiguate one conflict.
// disconnect( , const char *, , ) && 4 params
// disconnect( , QMetaMethod&, , )
// disconnect( , const QObject *, )
// disconnect( , const char * ) && 2 params
ICPPParameter[] params = function.getParameters();
if (params.length < 2)
return null;
IASTInitializerClause[] args = call.getArguments();
IType type1 = ASTUtil.getBaseType(params[1].getType());
// static bool disconnect( const QObject *sender, const QMetaMethod &signal,
// const QObject *receiver, const QMetaMethod &member );
if (QtKeywords.isQMetaMethod(type1)) {
// QMetaMethod cannot be statically analyzed.
return Collections.emptyList();
}
// Otherwise find the signal and member parameters based on the overload.
QtMethodReference signal = null;
QtMethodReference member = null;
if (type1 instanceof IBasicType && ( (IBasicType)type1 ).getKind() == IBasicType.Kind.eChar ) {
switch(params.length) {
// static bool disconnect( const QObject *sender, const char *signal,
// const QObject *receiver, const char *member );
case 4:
signal = QtMethodReference.parse(call, ASTUtil.getBaseType(safeArgsAt(args, 0)), safeArgsAt(args, 1));
member = QtMethodReference.parse(call, ASTUtil.getBaseType(safeArgsAt(args, 2)), safeArgsAt(args, 3));
break;
// inline bool disconnect( const QObject *receiver, const char *member = 0 );
case 2:
member = QtMethodReference.parse(call, ASTUtil.getBaseType(safeArgsAt(args, 0)), safeArgsAt(args, 1));
break;
}
}
// inline bool disconnect( const char *signal = 0,
// const QObject *receiver = 0, const char *member = 0 );
else if (QtKeywords.isQObject(type1)) {
ICPPClassType recvr = ASTUtil.getReceiverType(call);
signal = QtMethodReference.parse(call, recvr, safeArgsAt(args, 0));
member = QtMethodReference.parse(call, ASTUtil.getBaseType(safeArgsAt(args, 1)), safeArgsAt(args, 2));
}
return mergeNonNull(signal, member);
}
private static IASTNode safeArgsAt(IASTNode[] args, int index) {
return args.length > index ? args[index] : null;
}
private static <T> Collection<T> mergeNonNull(T...withNulls) {
T firstNonNull = null;
ArrayList<T> list = null;
for(T t : withNulls) {
if (t == null)
continue;
else if(list != null)
list.add(t);
else if(firstNonNull == null)
firstNonNull = t;
else {
list = new ArrayList<T>(withNulls.length);
list.add(firstNonNull);
list.add(t);
}
}
if (list != null)
return list;
if (firstNonNull != null)
return Collections.singletonList(firstNonNull);
return null;
}
}
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