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/*
* Copyright (c) 2013 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.parser;
import org.eclipse.cdt.core.dom.ast.IASTDeclarator;
import org.eclipse.cdt.core.dom.ast.IASTName;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTDeclarator;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTFunctionDeclarator;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTParameterDeclaration;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTTypeId;
import org.eclipse.cdt.core.dom.parser.cpp.GPPParserExtensionConfiguration;
import org.eclipse.cdt.core.parser.EndOfFileException;
import org.eclipse.cdt.core.parser.IToken;
import org.eclipse.cdt.core.parser.NullLogService;
import org.eclipse.cdt.core.parser.ParserMode;
import org.eclipse.cdt.internal.core.dom.parser.BacktrackException;
import org.eclipse.cdt.internal.core.dom.parser.DeclarationOptions;
import org.eclipse.cdt.internal.core.dom.parser.cpp.GNUCPPSourceParser;
/**
* A parser that use a special StringScanner to extract small sections of C++ syntax that
* are used in Qt macro expansions.
*
* @see StringScanner
*/
@SuppressWarnings("restriction")
public class QtParser extends GNUCPPSourceParser {
private QtParser(String str) {
super(new StringScanner(str), ParserMode.QUICK_PARSE, new NullLogService(), GPPParserExtensionConfiguration.getInstance());
}
/**
* The argument String is the expansion parameter for SIGNAL and SLOT macros. The text
* is parsed and the function declarator is returned if possible. Returns null if the
* string is not a valid function declarator reference.
*/
public static ICPPASTFunctionDeclarator parseQtMethodReference(String str) {
// Reject strings that have embedded line terminators. This is needed to properly check that
// one that is about to be added.
if (str == null
|| str.contains(";"))
return null;
QtParser parser = new QtParser(str + ';');
try {
IASTDeclarator declarator
= parser.declarator(GNUCPPSourceParser.DtorStrategy.PREFER_FUNCTION, DeclarationOptions.CPP_MEMBER);
if (!(declarator instanceof ICPPASTFunctionDeclarator))
return null;
// JI 439374: Make sure the ; was the last token read to prevent errors where extra strings
// appear in the expansion parameter.
if (parser.lastTokenFromScanner == null
|| parser.lastTokenFromScanner.getType() != IToken.tSEMI)
return null;
// JI 439374: Make sure the ; was the last token read to prevent errors where extra strings
// appear in the expansion parameter.
if (parser.lastTokenFromScanner == null
|| parser.lastTokenFromScanner.getType() != IToken.tSEMI)
return null;
// make sure this is a legal declarator for a Qt method reference
ICPPASTFunctionDeclarator function = (ICPPASTFunctionDeclarator) declarator;
// 1) parameters must not have names
for(ICPPASTParameterDeclaration param : function.getParameters()) {
ICPPASTDeclarator decltor = param.getDeclarator();
if (decltor == null)
continue;
IASTName paramName = decltor.getName();
if (paramName == null)
continue;
char[] name = paramName.getSimpleID();
if (name == null
|| name.length <= 0)
continue;
// The Qt normalization code treats a reference with a trailing const as a special case (this
// seems to be a bug in the way they normalize const pointers. We could support this case by
// allowing reference parameters to be named 'const'. However, since this seems to be a bug
// in Qt they will likely fix it at some point, and there doesn't seem to be a case where the
// user would need to reference the Qt method in this way.
// the parameter has a non-empty name, so reject the declarator
return null;
}
// All tests have passed, so return this declarator.
return function;
} catch(BacktrackException e) {
return null;
} catch(EndOfFileException e) {
return null;
}
}
public static ICPPASTTypeId parseTypeId(String str) {
QtParser parser = new QtParser(str);
try {
return parser.typeId(new DeclarationOptions(DeclarationOptions.NO_INITIALIZER));
} catch(BacktrackException e) {
return null;
} catch(EndOfFileException e) {
return null;
}
}
}
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