public override VfpExpression Visit(VfpVariableReferenceExpression expression)
{
Write(" ");
Write(expression.VariableName);
return(expression);
}
public override VfpExpression Visit(VfpVariableReferenceExpression expression)
{
foreach (var shortNames in SqlVisitor.AliasNames)
{
if (expression.VariableName.StartsWith(shortNames))
{
return(new VfpVariableReferenceExpression(expression.ResultType, expression.VariableName.Replace(shortNames, shortNames.Substring(0, 1))));
}
}
return(base.Visit(expression));
}
private static VfpExpression GetScanProperty(VfpVariableReferenceExpression variable, VfpExpression property)
{
var expression = VariableReferenceReplacer.Replace(variable, property);
var scanProperty = expression as VfpPropertyExpression;
if (scanProperty == null)
{
return(expression);
}
var variables = VariableReferenceGatherer.Gather(expression);
if (!variables.Any())
{
return(expression);
}
var scanVariable = variables.First();
return(scanVariable.Property(scanProperty.ResultType, scanProperty.Property));
}
private VfpLimitExpression GetVfpLimitExpression(VfpLimitExpression limitExpression, VfpScanExpression scanExpression)
{
if (scanExpression == null)
{
return(null);
}
var keyMembers = GetKeyMembers(scanExpression.Target.ElementType.KeyMembers);
if (!keyMembers.Any())
{
return(null);
}
var variableReference = new VfpVariableReferenceExpression(scanExpression.ResultType, GetUniqueVariableName());
var expressionBinding = new VfpExpressionBinding(scanExpression, variableReference);
var sortClauses = GetSortClauses(keyMembers, expressionBinding).ToList().AsReadOnly();
var sortExpression = new VfpSortExpression(scanExpression.ResultType, expressionBinding, sortClauses);
return(new VfpLimitExpression(limitExpression.ResultType,
sortExpression,
limitExpression.Limit,
limitExpression.WithTies));
}
public static VfpExpression Replace(VfpVariableReferenceExpression variableReferenceExpression, VfpExpression expression)
{
var rewriter = new VariableReferenceReplacer(variableReferenceExpression);
return(rewriter.Visit(expression));
}
public override VfpExpression Visit(VfpVariableReferenceExpression expression)
{
return(_variableReferenceExpression);
}
public VariableReferenceReplacer(VfpVariableReferenceExpression variableReferenceExpression)
{
_variableReferenceExpression = variableReferenceExpression;
}
public override VfpExpression Visit(VfpVariableReferenceExpression expression)
{
return(new VfpVariableReferenceExpression(_variableReference.ResultType, _variableReference.VariableName));
}
public VfpVariableReferenceExpressionRewriter(VfpVariableReferenceExpression variableReference)
{
_variableReference = variableReference;
}
protected VfpVariableReferenceExpression VisitNullHandler(VfpVariableReferenceExpression expression)
{
return(expression);
}
public virtual VfpExpression Visit(VfpVariableReferenceExpression expression)
{
return(new VfpVariableReferenceExpression(expression.ResultType, expression.VariableName));
}
public override VfpExpression Visit(VfpVariableReferenceExpression expression)
{
_expressions.Add(expression);
return(base.Visit(expression));
}
