private static (GraphQueryableField field, int index) ParseField(string queryString, int startingIndex)
{
var(fieldName, index) = ParseWord(queryString, startingIndex);
GraphQueryableField field = new GraphQueryableScalar(fieldName);
IEnumerable <GraphQueryableArgument> arguments = null;
while (index < queryString.Length)
{
var character = queryString[index];
if (character == '{')
{
var(@object, newIndex) = ParseObject(queryString, index);
@object.Name = fieldName;
if (arguments != null)
{
foreach (var argument in arguments)
{
@object.AddArgument(argument);
}
}
return(@object, newIndex);
}
else if (character == '(')
{
if (arguments != null)
{
throw new Exception($"Unexpected character: Found wrong character at {index}");
}
var(parsedArguments, newIndex) = ParseArguments(queryString, index);
arguments = parsedArguments;
index = newIndex;
}
else if (char.IsLetter(character) || character == ',' || character == '}')
{
// Missing arguments in field
return(character == ','
? (field, index + 1)
: (field, index));
}
else if (!char.IsSeparator(character))
{
throw new Exception($"Unexpected character: Found wrong character at {index}");
}
index++;
}
throw new Exception($"End-of-string: Cannot parse word at {startingIndex}");
}
public IGraphQueryableObject <TEntity> AddScalar <TProperty>(Expression <Func <TEntity, TProperty> > navigationFcn)
{
if (navigationFcn == null)
{
throw new ArgumentNullException(nameof(navigationFcn));
}
var propertyName = GetPropertyNameFromExpression(navigationFcn);
_fields[propertyName] = new GraphQueryableScalar(propertyName);
return(this);
}
internal IGraphQueryableObject <TEntity> AddScalar(GraphQueryableScalar scalar)
{
_fields.Add(scalar.Name, scalar);
return(this);
}
