internal static ITraversal GetTraversalFromTokens(IList <Token> tokens, GraphTraversalSource g,
IDictionary <string, object> contextParameterValues,
string traversalText)
{
object instance;
Type instanceType;
if (tokens[0].Name == "g")
{
instance = g;
instanceType = g.GetType();
}
else if (tokens[0].Name == "__")
{
instance = null;
instanceType = typeof(__);
}
else
{
throw BuildException(traversalText);
}
for (var i = 1; i < tokens.Count; i++)
{
var token = tokens[i];
token.SetContextParameterValues(contextParameterValues);
var name = GetCsharpName(token.Name);
var methods = instanceType.GetMethods(BindingFlags.Public | BindingFlags.Instance | BindingFlags.Static)
.Where(m => m.Name == name).ToList();
var method = GetClosestMethod(methods, token.Parameters);
if (method == null)
{
throw new InvalidOperationException($"Traversal method '{tokens[i].Name}' not found for testing");
}
var parameterValues = BuildParameters(method, token, out var genericParameters);
method = BuildGenericMethod(method, genericParameters, parameterValues);
instance = method.Invoke(instance, parameterValues);
instanceType = instance.GetType();
}
return((ITraversal)instance);
}