public override void Visit(WParenthesisExpression node)
{
node.Expression.Accept(this);
string expr = this.dfsStack.Pop();
string nodeStr = $"({expr})";
this.dfsStack.Push(nodeStr);
}
private WScalarExpression ParseScalarExpression(ScalarExpression scalarExpr)
{
if (scalarExpr == null)
{
return null;
}
switch (scalarExpr.GetType().Name)
{
case "BinaryExpression":
{
var bexpr = scalarExpr as BinaryExpression;
var wexpr = new WBinaryExpression
{
ExpressionType = bexpr.BinaryExpressionType,
FirstExpr = ParseScalarExpression(bexpr.FirstExpression),
SecondExpr = ParseScalarExpression(bexpr.SecondExpression),
FirstTokenIndex = bexpr.FirstTokenIndex,
LastTokenIndex = bexpr.LastTokenIndex,
};
return wexpr;
}
case "UnaryExpression":
{
var uexpr = scalarExpr as UnaryExpression;
var wuexpr = new WUnaryExpression
{
Expression = ParseScalarExpression(uexpr.Expression),
ExpressionType = uexpr.UnaryExpressionType,
FirstTokenIndex = uexpr.FirstTokenIndex,
LastTokenIndex = uexpr.LastTokenIndex
};
return wuexpr;
}
case "ColumnReferenceExpression":
{
var cre = scalarExpr as ColumnReferenceExpression;
var wexpr = new WColumnReferenceExpression
{
MultiPartIdentifier = ParseMultiPartIdentifier(cre.MultiPartIdentifier),
ColumnType = cre.ColumnType,
FirstTokenIndex = cre.FirstTokenIndex,
LastTokenIndex = cre.LastTokenIndex
};
return wexpr;
}
case "ScalarSubquery":
{
var oquery = scalarExpr as ScalarSubquery;
var wexpr = new WScalarSubquery
{
SubQueryExpr = ParseSelectQueryStatement(oquery.QueryExpression),
FirstTokenIndex = oquery.FirstTokenIndex,
LastTokenIndex = oquery.LastTokenIndex
};
return wexpr;
}
case "ParenthesisExpression":
{
var parenExpr = scalarExpr as ParenthesisExpression;
var wexpr = new WParenthesisExpression
{
Expression = ParseScalarExpression(parenExpr.Expression),
FirstTokenIndex = parenExpr.FirstTokenIndex,
LastTokenIndex = parenExpr.LastTokenIndex,
};
return wexpr;
}
case "FunctionCall":
{
var fc = scalarExpr as FunctionCall;
var wexpr = new WFunctionCall
{
CallTarget = ParseCallTarget(fc.CallTarget),
FunctionName = fc.FunctionName,
UniqueRowFilter = fc.UniqueRowFilter,
FirstTokenIndex = fc.FirstTokenIndex,
LastTokenIndex = fc.LastTokenIndex,
};
if (fc.Parameters == null) return wexpr;
wexpr.Parameters = new List<WScalarExpression>(fc.Parameters.Count);
foreach (var pe in fc.Parameters.Select(ParseScalarExpression).Where(pe => pe != null))
{
wexpr.Parameters.Add(pe);
}
return wexpr;
}
case "SearchedCaseExpression":
{
var caseExpr = scalarExpr as SearchedCaseExpression;
var wexpr = new WSearchedCaseExpression
{
FirstTokenIndex = caseExpr.FirstTokenIndex,
LastTokenIndex = caseExpr.LastTokenIndex,
WhenClauses = new List<WSearchedWhenClause>(caseExpr.WhenClauses.Count)
};
foreach (var pwhen in caseExpr.WhenClauses.Select(swhen => new WSearchedWhenClause
{
WhenExpression = ParseBooleanExpression(swhen.WhenExpression),
ThenExpression = ParseScalarExpression(swhen.ThenExpression),
FirstTokenIndex = swhen.FirstTokenIndex,
LastTokenIndex = swhen.LastTokenIndex,
}))
{
wexpr.WhenClauses.Add(pwhen);
}
wexpr.ElseExpr = ParseScalarExpression(caseExpr.ElseExpression);
return wexpr;
}
case "CastCall":
{
var castExpr = scalarExpr as CastCall;
var wexpr = new WCastCall
{
DataType = ParseDataType(castExpr.DataType),
Parameter = ParseScalarExpression(castExpr.Parameter),
FirstTokenIndex = castExpr.FirstTokenIndex,
LastTokenIndex = castExpr.LastTokenIndex,
};
return wexpr;
}
default:
{
if (!(scalarExpr is ValueExpression)) return null;
var wexpr = new WValueExpression
{
FirstTokenIndex = scalarExpr.FirstTokenIndex,
LastTokenIndex = scalarExpr.LastTokenIndex,
};
var expr = scalarExpr as Literal;
if (expr != null)
{
wexpr.Value = expr.Value;
if (expr.LiteralType == LiteralType.String)
{
wexpr.SingleQuoted = true;
}
}
else
{
var reference = scalarExpr as VariableReference;
wexpr.Value = reference != null ? reference.Name : ((GlobalVariableExpression)scalarExpr).Name;
}
return wexpr;
}
}
}
public virtual void Visit(WParenthesisExpression node)
{
node.AcceptChildren(this);
}
public virtual void Visit(WParenthesisExpression node)
{
node.AcceptChildren(this);
}