private PqlOutput ProcessResult(PqlResult result)
{
if (result is PqlBoolean)
{
return(new PqlBooleanOutput(resultBoolean));
}
else
{
PqlTupleOutput output = new PqlTupleOutput();
if (resultBoolean)
{
PqlTuple tuple = result as PqlTuple;
foreach (PqlElem elem in tuple.Elems)
{
string synonym;
if (elem is PqlAttrRef)
{
synonym = (elem as PqlAttrRef).SynonymName;
}
else
{
synonym = (elem as PqlSynonym).Name;
}
PqlDeclaration declaration = Declarations.GetDeclarationBySynonym(synonym);
output.Declarations.AddDeclaration(declaration);
}
}
return(output);
}
}
public PqlSelect(IDeclarationList declarations, PqlResult result, List <PqlWith> withClauses, List <PqlSuchThat> suchThatClauses, List <PqlPatternCond> patternClauses)
{
Declarations = declarations;
Result = result;
WithClauses = withClauses;
SuchThatClauses = suchThatClauses;
PatternClauses = patternClauses;
}
private PqlSelect SelectCl()
{
IDeclarationList declarations = Declarations();
Eat(PqlTokenType.SELECT);
PqlResult result = ResultCl();
List <PqlWith> withClauses = new List <PqlWith>();
List <PqlSuchThat> suchThatClauses = new List <PqlSuchThat>();
List <PqlPatternCond> patternClauses = new List <PqlPatternCond>();
while (currentToken.Type == PqlTokenType.SUCH ||
currentToken.Type == PqlTokenType.WITH ||
currentToken.Type == PqlTokenType.PATTERN)
{
switch (currentToken.Type)
{
case PqlTokenType.SUCH:
suchThatClauses.Add(SuchThatCl());
break;
case PqlTokenType.WITH:
withClauses.Add(WithCl());
break;
case PqlTokenType.PATTERN:
patternClauses.Add(PatternCl());
break;
default:
throw new Exception();
}
}
return(new PqlSelect(declarations, result, withClauses, suchThatClauses, patternClauses));
}
