public override void Visit(WBooleanNotExpression node)
{
node.Expression.Accept(this);
string expr = this.dfsStack.Pop();
string nodeStr = $"NOT {expr}";
this.dfsStack.Push(nodeStr);
}
private WBooleanExpression ParseBooleanExpression(BooleanExpression bexpr)
{
if (bexpr == null)
{
return null;
}
switch (bexpr.GetType().Name)
{
case "BooleanBinaryExpression":
{
var oexpr = bexpr as BooleanBinaryExpression;
var pexpr = new WBooleanBinaryExpression
{
FirstExpr = ParseBooleanExpression(oexpr.FirstExpression),
SecondExpr = ParseBooleanExpression(oexpr.SecondExpression),
BooleanExpressionType = oexpr.BinaryExpressionType,
FirstTokenIndex = oexpr.FirstTokenIndex,
LastTokenIndex = oexpr.LastTokenIndex,
};
return pexpr;
}
case "BooleanComparisonExpression":
{
var oexpr = bexpr as BooleanComparisonExpression;
var pexpr = new WBooleanComparisonExpression
{
ComparisonType = oexpr.ComparisonType,
FirstExpr = ParseScalarExpression(oexpr.FirstExpression),
SecondExpr = ParseScalarExpression(oexpr.SecondExpression),
FirstTokenIndex = oexpr.FirstTokenIndex,
LastTokenIndex = oexpr.LastTokenIndex,
};
return pexpr;
}
case "BooleanIsNullExpression":
{
var oexpr = bexpr as BooleanIsNullExpression;
var pexpr = new WBooleanIsNullExpression
{
IsNot = oexpr.IsNot,
Expression = ParseScalarExpression(oexpr.Expression),
FirstTokenIndex = oexpr.FirstTokenIndex,
LastTokenIndex = oexpr.LastTokenIndex,
};
return pexpr;
}
case "BooleanNotExpression":
{
var oexpr = bexpr as BooleanNotExpression;
var pexpr = new WBooleanNotExpression
{
Expression = ParseBooleanExpression(oexpr.Expression),
FirstTokenIndex = oexpr.FirstTokenIndex,
LastTokenIndex = oexpr.LastTokenIndex,
};
return pexpr;
}
case "BooleanParenthesisExpression":
{
var oexpr = bexpr as BooleanParenthesisExpression;
var pexpr = new WBooleanParenthesisExpression
{
Expression = ParseBooleanExpression(oexpr.Expression),
FirstTokenIndex = oexpr.FirstTokenIndex,
LastTokenIndex = oexpr.LastTokenIndex,
};
return pexpr;
}
case "BooleanTernaryExpression":
{
var oexpr = bexpr as BooleanTernaryExpression;
var pexpr = new WBetweenExpression
{
FirstTokenIndex = oexpr.FirstTokenIndex,
LastTokenIndex = oexpr.LastTokenIndex,
};
switch (oexpr.TernaryExpressionType)
{
case BooleanTernaryExpressionType.Between:
pexpr.NotDefined = false;
break;
case BooleanTernaryExpressionType.NotBetween:
pexpr.NotDefined = true;
break;
default:
throw new GraphViewException("Undefined tenary expression type");
}
pexpr.FirstExpr = ParseScalarExpression(oexpr.FirstExpression);
pexpr.SecondExpr = ParseScalarExpression(oexpr.SecondExpression);
pexpr.ThirdExpr = ParseScalarExpression(oexpr.ThirdExpression);
return pexpr;
}
case "ExistsPredicate":
{
var oexpr = bexpr as ExistsPredicate;
var pexpr = new WExistsPredicate
{
FirstTokenIndex = oexpr.FirstTokenIndex,
LastTokenIndex = oexpr.LastTokenIndex,
Subquery =
new WScalarSubquery
{
SubQueryExpr = ParseSelectQueryStatement(oexpr.Subquery.QueryExpression),
FirstTokenIndex = oexpr.Subquery.FirstTokenIndex,
LastTokenIndex = oexpr.Subquery.LastTokenIndex,
}
};
return pexpr;
}
case "InPredicate":
{
var oexpr = bexpr as InPredicate;
var pexpr = new WInPredicate
{
Expression = ParseScalarExpression(oexpr.Expression),
NotDefined = oexpr.NotDefined,
FirstTokenIndex = oexpr.FirstTokenIndex,
LastTokenIndex = oexpr.LastTokenIndex,
};
if (oexpr.Subquery != null)
{
pexpr.Subquery = new WScalarSubquery
{
SubQueryExpr = ParseSelectQueryStatement(oexpr.Subquery.QueryExpression),
FirstTokenIndex = oexpr.Subquery.FirstTokenIndex,
LastTokenIndex = oexpr.Subquery.LastTokenIndex,
};
}
else
{
pexpr.Values = new List<WScalarExpression>(oexpr.Values.Count);
foreach (var wexp in oexpr.Values.Select(ParseScalarExpression).Where(wexp => wexp != null))
{
pexpr.Values.Add(wexp);
}
}
return pexpr;
}
case "LikePredicate":
{
var oexpr = bexpr as LikePredicate;
var pexpr = new WLikePredicate
{
EscapeExpr = ParseScalarExpression(oexpr.EscapeExpression),
FirstExpr = ParseScalarExpression(oexpr.FirstExpression),
SecondExpr = ParseScalarExpression(oexpr.SecondExpression),
NotDefined = oexpr.NotDefined,
FirstTokenIndex = oexpr.FirstTokenIndex,
LastTokenIndex = oexpr.LastTokenIndex,
};
return pexpr;
}
case "SubqueryComparisonPredicate":
{
var oexpr = bexpr as SubqueryComparisonPredicate;
var pexpr = new WSubqueryComparisonPredicate
{
FirstTokenIndex = oexpr.FirstTokenIndex,
LastTokenIndex = oexpr.LastTokenIndex,
Subquery = new WScalarSubquery()
{
SubQueryExpr = ParseSelectQueryStatement(oexpr.Subquery.QueryExpression),
FirstTokenIndex = oexpr.Subquery.FirstTokenIndex,
LastTokenIndex = oexpr.Subquery.LastTokenIndex
},
ComparisonType = oexpr.ComparisonType,
Expression = ParseScalarExpression(oexpr.Expression),
SubqueryComparisonType = oexpr.SubqueryComparisonPredicateType,
};
return pexpr;
}
default:
{
return null;
}
}
}
public virtual void Visit(WBooleanNotExpression node)
{
node.AcceptChildren(this);
}
public virtual void Visit(WBooleanNotExpression node)
{
node.AcceptChildren(this);
}
public override void Visit(WBooleanNotExpression node)
{
this.Extract(node);
}
public override void Visit(WBooleanNotExpression node)
{
Attach(node);
}