/// <inheritdoc cref="UnaryExpression.Update(Expression)" select="summary"/>
public LetClause Update(ParameterExpression variable, Expression expression)
{
if (Variable == variable && Expression == expression)
{
return(this);
}
return(Expressive.Let(variable, expression));
}
private QueryClause VisitSelect(MethodCallExpression node, LambdaExpression selector)
{
if (selector.Body is NewExpression @new)
{
// let {variable} = {expression}
PropertyInfo prop = (PropertyInfo)@new.Members[1];
ParameterExpression variable = GetVariable(prop.PropertyType, prop.Name);
return(Expressive.Let(variable, @new.Arguments[1]));
}
if (true)
{
// select {expression}
return(Expressive.Select(selector.Body));
}
else
{
}
return(null);
}
private QueryClause VisitContinuationClause(QueryClauseSyntax clause)
{
switch (clause)
{
case FromClauseSyntax from:
return(Expressive.From(null, from.Expression.Accept(this)));
case LetClauseSyntax let:
return(Expressive.Let(null, let.Expression.Accept(this)));
case JoinClauseSyntax join:
return(Expressive.Join(null, join.InExpression.Accept(this), join.LeftExpression.Accept(this), join.RightExpression.Accept(this)));
case WhereClauseSyntax where:
return(Expressive.Where(where.Condition.Accept(this)));
case OrderByClauseSyntax orderby:
return(Expressive.OrderBy(Utils.Select(@orderby.Orderings, x => Expressive.Ordering(x.Expression.Accept(this), x.AscendingOrDescendingKeyword.Text == "ascending"))));
default:
throw new ArgumentException("Invalid clause.");
}
}
