/*
* #%~
* 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.type;
import org.overture.ast.analysis.AnalysisException;
import org.overture.ast.analysis.QuestionAnswerAdaptor;
import org.overture.ast.definitions.PDefinition;
import org.overture.ast.node.INode;
import org.overture.ast.types.AAccessSpecifierAccessSpecifier;
import org.overture.ast.types.ABracketType;
import org.overture.ast.types.AFieldField;
import org.overture.ast.types.AFunctionType;
import org.overture.ast.types.ANamedInvariantType;
import org.overture.ast.types.AOperationType;
import org.overture.ast.types.AOptionalType;
import org.overture.ast.types.ARecordInvariantType;
import org.overture.ast.types.SSetType;
import org.overture.ast.types.AUnionType;
import org.overture.ast.types.AUnknownType;
import org.overture.ast.types.PType;
import org.overture.ast.types.SInvariantType;
import org.overture.ast.types.SSeqType;
import org.overture.typechecker.assistant.ITypeCheckerAssistantFactory;
/**
* Checks if a type is smaller than a specifier type.
*
* @author kel
*/
public class NarrowerThanComparator extends
QuestionAnswerAdaptor<AAccessSpecifierAccessSpecifier, Boolean>
{
protected ITypeCheckerAssistantFactory af;
public NarrowerThanComparator(ITypeCheckerAssistantFactory af)
{
this.af = af;
}
@Override
public Boolean caseABracketType(ABracketType type,
AAccessSpecifierAccessSpecifier accessSpecifier)
throws AnalysisException
{
return type.getType().apply(this, accessSpecifier);
}
@Override
public Boolean caseAFunctionType(AFunctionType type,
AAccessSpecifierAccessSpecifier accessSpecifier)
throws AnalysisException
{
for (PType t : type.getParameters())
{
if (t.apply(this, accessSpecifier)) // (PTypeAssistantTC.narrowerThan(t, accessSpecifier))
{
return true;
}
}
return type.getResult().apply(this, accessSpecifier); // PTypeAssistantTC.narrowerThan(type.getResult(),accessSpecifier);
}
@Override
public Boolean caseAOperationType(AOperationType type,
AAccessSpecifierAccessSpecifier accessSpecifier)
throws AnalysisException
{
for (PType t : type.getParameters())
{
if (t.apply(this, accessSpecifier))// (PTypeAssistantTC.narrowerThan(t, accessSpecifier))
{
return true;
}
}
return type.getResult().apply(this, accessSpecifier); // PTypeAssistantTC.narrowerThan(type.getResult(),accessSpecifier);
}
@Override
public Boolean caseAOptionalType(AOptionalType type,
AAccessSpecifierAccessSpecifier accessSpecifier)
throws AnalysisException
{
// return AOptionalTypeAssistantTC.narrowerThan(type, accessSpecifier);
return type.getType().apply(this, accessSpecifier);
}
@Override
public Boolean defaultSSeqType(SSeqType type,
AAccessSpecifierAccessSpecifier accessSpecifier)
throws AnalysisException
{
return type.getSeqof().apply(this, accessSpecifier);
}
@Override
public Boolean defaultSSetType(SSetType type,
AAccessSpecifierAccessSpecifier accessSpecifier)
throws AnalysisException
{
return type.getSetof().apply(this, accessSpecifier);
}
@Override
public Boolean caseAUnionType(AUnionType type,
AAccessSpecifierAccessSpecifier accessSpecifier)
throws AnalysisException
{
for (PType t : type.getTypes())
{
if (t.apply(this, accessSpecifier)) // (PTypeAssistantTC.narrowerThan(t, accessSpecifier))
{
return true;
}
}
return false;
}
@Override
public Boolean caseAUnknownType(AUnknownType type,
AAccessSpecifierAccessSpecifier accessSpecifier)
throws AnalysisException
{
return false;
}
@Override
public Boolean caseANamedInvariantType(ANamedInvariantType type,
AAccessSpecifierAccessSpecifier accessSpecifier)
throws AnalysisException
{
if (type.getInNarrower())
{
return false;
}
type.setInNarrower(true);
boolean result = false;
if (type.getDefinitions().size() > 0)
{
for (PDefinition d : type.getDefinitions())
{
if (af.createPAccessSpecifierAssistant().narrowerThan(d.getAccess(), accessSpecifier))
{
result = true;
break;
}
}
} else if (type.getType().getDefinitions().size() == 0)
{
result = type.apply(this, accessSpecifier)
|| af.createPTypeAssistant().narrowerThanBaseCase(type, accessSpecifier);// PTypeAssistantTC.narrowerThan(type,
// accessSpecifier)
} else
{
for (PDefinition d : type.getType().getDefinitions())
{
if (af.createPAccessSpecifierAssistant().narrowerThan(d.getAccess(), accessSpecifier))
{
result = true;
break;
}
}
}
type.setInNarrower(false);
return result;
}
@Override
public Boolean caseARecordInvariantType(ARecordInvariantType type,
AAccessSpecifierAccessSpecifier accessSpecifier)
throws AnalysisException
{
if (type.getInNarrower())
{
return false;
} else
{
type.setInNarrower(true);
}
boolean result = false;
if (type.getDefinitions().size() > 0)
{
for (PDefinition d : type.getDefinitions())
{
if (af.createPAccessSpecifierAssistant().narrowerThan(d.getAccess(), accessSpecifier))
{
result = true;
break;
}
}
} else
{
for (AFieldField field : type.getFields())
{
if (field.getType().apply(this, accessSpecifier))// (PTypeAssistantTC.narrowerThan(field.getType(),
// accessSpecifier))
{
result = true;
break;
}
}
}
type.setInNarrower(false);
return result;
}
@Override
public Boolean defaultSInvariantType(SInvariantType type,
AAccessSpecifierAccessSpecifier accessSpecifier)
throws AnalysisException
{
return af.createPTypeAssistant().narrowerThanBaseCase(type, accessSpecifier);
}
@Override
public Boolean defaultPType(PType type,
AAccessSpecifierAccessSpecifier accessSpecifier)
throws AnalysisException
{
return af.createPTypeAssistant().narrowerThanBaseCase(type, accessSpecifier);
}
@Override
public Boolean createNewReturnValue(INode node,
AAccessSpecifierAccessSpecifier question) throws AnalysisException
{
// TODO Auto-generated method stub
return null;
}
@Override
public Boolean createNewReturnValue(Object node,
AAccessSpecifierAccessSpecifier question) throws AnalysisException
{
// TODO Auto-generated method stub
return null;
}
}