static ParsedQueryNode Traverse(ParsedQueryNode node, ParsedQueryNodeVisitorLookup visitor, ParsedQueryNode parent)
{
if (node == null) return null;
if (node.GetType() == typeof (ParsedQuery))
{
var query = node.As<ParsedQuery>();
node = new ParsedQuery(query.Fields.Select(n => Traverse(n, visitor, node)).ToArray());
}
if (node.GetType() == typeof (ParsedField))
{
var field = node.As<ParsedField>();
node = new ParsedField(
field.Value,
field.Alias,
field.Parameters.Select(n => Traverse(n, visitor, node)).ToArray(),
field.Fields.Select(n => Traverse(n, visitor, node)).ToArray());
}
if (node.GetType() == typeof (ParsedArgument))
{
var arg = node.As<ParsedArgument>();
node = new ParsedArgument(arg.Name, Traverse(arg.Value, visitor, node));
}
return visitor.Lookup(node.GetType()).Visit(node, parent);
}
public static ParsedQueryNode Traverse(ParsedQueryNode node, ParsedQueryNodeVisitorLookup visitor)
{
return Traverse(node, visitor, null);
}
public static string Run(string query, GraphQlSchema schema)
{
ParsedQuery parsedQuery = GraphQlParser.ParseQuery(query);
var schemaCursor = new GraphQlSchemaCursor(schema);
var queryTree = new QueryTree();
var queryTreeCursor = new QueryTreeCursor(queryTree);
var visitorLookup = new ParsedQueryNodeVisitorLookup();
visitorLookup.RegisterForNode<ParsedQuery>(new NullQueryParsedQueryNodeVisitor());
visitorLookup.RegisterForNode<ParsedField>(new FieldSelectionVisitor(schemaCursor, queryTreeCursor));
ParsedQueryTraverser.Traverse(parsedQuery, visitorLookup);
}
