/*
* #%~
* The VDM Type Checker
* %%
* Copyright (C) 2008 - 2014 Overture
* %%
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program. If not, see
* <http://www.gnu.org/licenses/gpl-3.0.html>.
* #~%
*/
package org.overture.typechecker.utilities.pattern;
import java.util.LinkedList;
import org.overture.ast.analysis.AnalysisException;
import org.overture.ast.analysis.AnswerAdaptor;
import org.overture.ast.node.INode;
import org.overture.ast.patterns.AConcatenationPattern;
import org.overture.ast.patterns.AIdentifierPattern;
import org.overture.ast.patterns.AIgnorePattern;
import org.overture.ast.patterns.AMapPattern;
import org.overture.ast.patterns.AMapUnionPattern;
import org.overture.ast.patterns.AMapletPatternMaplet;
import org.overture.ast.patterns.ANamePatternPair;
import org.overture.ast.patterns.AObjectPattern;
import org.overture.ast.patterns.ARecordPattern;
import org.overture.ast.patterns.ASeqPattern;
import org.overture.ast.patterns.ASetPattern;
import org.overture.ast.patterns.ATuplePattern;
import org.overture.ast.patterns.AUnionPattern;
import org.overture.ast.patterns.PPattern;
import org.overture.typechecker.assistant.ITypeCheckerAssistantFactory;
/**
* Used to check if a pattern is a simple value.
*
* @author kel
*/
public class SimplePatternChecker extends AnswerAdaptor<Boolean>
{
protected ITypeCheckerAssistantFactory af;
public SimplePatternChecker(ITypeCheckerAssistantFactory af)
{
this.af = af;
}
@Override
public Boolean caseAConcatenationPattern(AConcatenationPattern pattern)
throws AnalysisException
{
return pattern.getLeft().apply(THIS) && pattern.getRight().apply(THIS);
}
@Override
public Boolean caseAIdentifierPattern(AIdentifierPattern pattern)
throws AnalysisException
{
return false;
}
@Override
public Boolean caseAIgnorePattern(AIgnorePattern pattern)
throws AnalysisException
{
return false;
}
@Override
public Boolean caseAMapUnionPattern(AMapUnionPattern pattern)
throws AnalysisException
{
return pattern.getLeft().apply(THIS) && pattern.getRight().apply(THIS);
}
@Override
public Boolean caseARecordPattern(ARecordPattern pattern)
throws AnalysisException
{
return af.createPPatternListAssistant().isSimple(pattern.getPlist());
}
@Override
public Boolean caseASeqPattern(ASeqPattern pattern)
throws AnalysisException
{
return af.createPPatternListAssistant().isSimple(pattern.getPlist());
}
@Override
public Boolean caseASetPattern(ASetPattern pattern)
throws AnalysisException
{
return af.createPPatternListAssistant().isSimple(pattern.getPlist());
}
@Override
public Boolean caseATuplePattern(ATuplePattern pattern)
throws AnalysisException
{
return af.createPPatternListAssistant().isSimple(pattern.getPlist());
}
@Override
public Boolean caseAUnionPattern(AUnionPattern pattern)
throws AnalysisException
{
return pattern.getLeft().apply(THIS) && pattern.getRight().apply(THIS);
}
@Override
public Boolean caseAMapPattern(AMapPattern pattern)
throws AnalysisException
{
for (AMapletPatternMaplet mp : pattern.getMaplets())
{
// if (!AMapletPatternMapletAssistantTC.isSimple(mp)) // Original code.
if (!mp.apply(THIS))
{
return false;
}
}
return true;
}
@Override
public Boolean caseAObjectPattern(AObjectPattern pattern)
throws AnalysisException
{
LinkedList<PPattern> list = new LinkedList<PPattern>();
for (ANamePatternPair npp: pattern.getFields())
{
list.add(npp.getPattern());
}
return af.createPPatternListAssistant().isSimple(list);
}
@Override
public Boolean defaultPPattern(PPattern pattern) throws AnalysisException
{
/*
* True if the pattern is a simple value that can match only one value for certain. Most pattern types are like
* this, but any that include variables or ignore patterns are not.
*/
return true;
}
@Override
public Boolean createNewReturnValue(INode node) throws AnalysisException
{
// TODO Auto-generated method stub
return false;
}
@Override
public Boolean createNewReturnValue(Object node) throws AnalysisException
{
// TODO Auto-generated method stub
return false;
}
}