public string CombineQuery(AstNode node, AstNode rootQuery = null)
{
if (rootQuery == null)
{
rootQuery = node;
}
QueryExpression query = node as QueryExpression;
if (query != null)
{
string continuationIdentifier = null;
foreach (var clause in query.Clauses)
{
var continuation = clause as QueryContinuationClause;
if (continuation != null)
{
CombineQuery(continuation.PrecedingQuery);
}
var from = clause as QueryFromClause;
if (from != null)
{
continuationIdentifier = CombineQuery(from.Expression, rootQuery);
}
}
QueryFromClause fromClause = (QueryFromClause)query.Clauses.First();
QueryExpression innerQuery = fromClause.Expression as QueryExpression;
if (innerQuery != null)
{
continuationIdentifier = continuationIdentifier ?? ((QueryFromClause)innerQuery.Clauses.First()).Identifier;
string transparentIdentifier;
if (TryRemoveTransparentIdentifier(query, fromClause, innerQuery, continuationIdentifier, out transparentIdentifier))
{
RemoveTransparentIdentifierReferences(rootQuery, transparentIdentifier);
}
else if (fromClause.Type.IsNull)
{
QueryContinuationClause continuation = new QueryContinuationClause();
continuation.PrecedingQuery = innerQuery.Detach();
continuation.Identifier = fromClause.Identifier;
fromClause.ReplaceWith(continuation);
}
return(transparentIdentifier);
}
else
{
Match m = castPattern.Match(fromClause.Expression);
if (m.Success)
{
fromClause.Type = m.Get <AstType>("targetType").Single().Detach();
fromClause.Expression = m.Get <Expression>("inExpr").Single().Detach();
}
}
}
return(null);
}
protected internal override bool DoMatch(AstNode other, PatternMatching.Match match)
{
QueryContinuationClause o = other as QueryContinuationClause;
return(o != null && MatchString(this.Identifier, o.Identifier) && this.PrecedingQuery.DoMatch(o.PrecedingQuery, match));
}
void IAstVisitor.VisitQueryContinuationClause(QueryContinuationClause queryContinuationClause)
{
Visit(EnterQueryContinuationClause, LeaveQueryContinuationClause, queryContinuationClause);
}
public override void VisitQueryContinuationClause(QueryContinuationClause queryContinuationClause)
{
VisitChildren(queryContinuationClause);
}