protected internal override bool DoMatch(AstNode other, PatternMatching.Match match)
{
QueryFromClause o = other as QueryFromClause;
return(o != null && this.Type.DoMatch(o.Type, match) && MatchString(this.Identifier, o.Identifier) &&
this.Expression.DoMatch(o.Expression, match));
}
S IAstVisitor <T, S> .VisitQueryFromClause(QueryFromClause queryFromClause, T data)
{
var handler = QueryFromClauseVisited;
if (handler != null)
{
handler(queryFromClause, data);
}
return(VisitChildren(queryFromClause, data));
}
public override AstNode VisitQueryFromClause(QueryFromClause queryFromClause)
{
if (currentResult == null)
{
AddFirstMemberToCurrentTransparentType(queryFromClause.IdentifierToken);
if (queryFromClause.Type.IsNull)
{
return(VisitNested(queryFromClause.Expression, null));
}
else
{
return(VisitNested(queryFromClause.Expression, null).Invoke("Cast", new[] { queryFromClause.Type.Clone() }, new Expression[0]));
}
}
else
{
var innerSelectorParam = CreateParameterForCurrentRangeVariable();
var innerSelector = CreateLambda(new[] { innerSelectorParam }, VisitNested(queryFromClause.Expression, innerSelectorParam));
var clonedIdentifier = (Identifier)queryFromClause.IdentifierToken.Clone();
var resultParam = CreateParameterForCurrentRangeVariable();
Expression body;
// Second from clause - SelectMany
var select = GetNextQueryClause(queryFromClause) as QuerySelectClause;
if (select != null)
{
body = VisitNested(select.Expression, resultParam);
eatSelect = true;
}
else
{
body = AddMemberToCurrentTransparentType(resultParam, queryFromClause.IdentifierToken, new IdentifierExpression(queryFromClause.Identifier), false);
}
var resultSelectorParam2 = CreateParameter(clonedIdentifier);
var resultSelector = CreateLambda(new[] { resultParam, resultSelectorParam2 }, body);
rangeVariables[queryFromClause.IdentifierToken] = resultSelectorParam2;
return(currentResult.Invoke("SelectMany", innerSelector, resultSelector));
}
}
void IAstVisitor.VisitQueryFromClause(QueryFromClause queryFromClause)
{
Visit(EnterQueryFromClause, LeaveQueryFromClause, queryFromClause);
}