private List <SelectionItem> BuildSelectionItemsList(Node selSetNode, NamedRequestObject parentItem)
{
var selItems = new List <SelectionItem>();
foreach (var selNode in selSetNode.ChildNodes)
{
SelectionItem selItem = null;
switch (selNode.Term.Name)
{
case TermNames.SelField:
selItem = BuildSelectionField(selNode, parentItem);
break;
case TermNames.FragmSpread:
var name = selNode.ChildNodes[1].GetText();
selItem = new FragmentSpread()
{
Name = name, SourceLocation = selNode.GetLocation()
};
var dirListNode = selNode.FindChild(TermNames.DirListOpt);
selItem.Directives = BuildDirectives(dirListNode, DirectiveLocation.Field, selItem);
break;
case TermNames.InlineFragm:
selItem = BuildInlineFragment(selNode);
break;
}
if (selItem != null)
{
selItems.Add(selItem);
}
}
return(selItems);
}
private string PrintFragmentSpread(FragmentSpread node)
{
var name = PrintName(node.FragmentName);
var directives = node.Directives?.Select(PrintDirective) ?? Array.Empty <string>();
return($"...{name}{Wrap(string.Empty, Join(directives, " "))}");
}
public void MergeFieldAndFragment()
{
var fragment = new FragmentDefinition(new NameNode("fragment"));
var fragmentSelection = new SelectionSet();
fragmentSelection.Add(FirstTestField);
fragment.SelectionSet = fragmentSelection;
fragment.Type = new GraphQL.Language.AST.NamedType(
new NameNode("Person"));
var fragments = new Fragments { fragment };
var schema = new Schema();
schema.RegisterType(new PersonType());
var context = new ExecutionContext
{
Fragments = fragments,
Schema = schema
};
var fragSpread = new FragmentSpread(new NameNode("fragment"));
var outerSelection = new SelectionSet();
outerSelection.Add(fragSpread);
outerSelection.Add(SecondTestField);
var fields = ExecutionHelper.CollectFields(
context,
new PersonType(),
outerSelection);
fields.ShouldHaveSingleItem();
fields["test"].SelectionSet.Selections.ShouldContain(x => x.IsEqualTo(FirstInnerField));
fields["test"].SelectionSet.Selections.ShouldContain(x => x.IsEqualTo(SecondInnerField));
}
} //method
private bool Fragments_CheckFragmentSpreadCompatible(FragmentSpread fragmentSpread, TypeDefBase parentType)
{
var fragmOnTypeDef = fragmentSpread.Fragment.OnTypeRef.TypeDef;
if (parentType == fragmOnTypeDef)
{
return(true); //trivial case
}
var fragmName = fragmentSpread.Name;
switch (parentType)
{
case ObjectTypeDef parObjType:
// parent type is object type; the only allowed (non-trivial) case is fragment on interface
if (!parObjType.Implements.Contains(fragmOnTypeDef))
{
AddError($"Fragment ref '{fragmName}': fragment is defined on type '{fragmOnTypeDef.Name}'" +
$" which is not compatible with type '{parentType.Name}'.",
fragmentSpread);
return(false);
}
break;
case InterfaceTypeDef parIntfType:
// parent type is interface; fragment's type must be object implementing interface
if (!parIntfType.PossibleTypes.Contains(fragmOnTypeDef))
{
AddError($"Fragment ref {fragmName}: fragment is defined on type '{fragmOnTypeDef.Name}'" +
$" which is not compatible with type '{parentType.Name}'.",
fragmentSpread);
return(false);
}
break;
case UnionTypeDef parUnionType:
// fragment's on-type must be one of the unioned types; of if fragm is on interface, implemented by at least one of the types
if (fragmOnTypeDef is InterfaceTypeDef fragmIntType)
{
if (!parUnionType.PossibleTypes.Any(t => t.Implements.Contains(fragmIntType)))
{
AddError($"Fragment ref {fragmName}: fragment is defined on interface '{fragmIntType.Name}' which is " +
$"not implemented by any of the unioned types in '{parentType.Name}'.", fragmentSpread);
return(false);
}
}
else
{
// fragm is on object type
if (!parUnionType.PossibleTypes.Contains(fragmOnTypeDef))
{
AddError($"Fragment ref {fragmName}: fragment is defined on type '{fragmOnTypeDef.Name}' which is not " +
$"one of the unioned types in '{parentType.Name}'.", fragmentSpread);
return(false);
}
}
break;
}
return(true);
}
private void VisitFragmentSpread(FragmentSpread node)
{
EnterNode(node);
Visit(node.Directives);
ExitNode(node);
}
public override FragmentSpread BeginVisitFragmentSpread(
FragmentSpread fragmentSpread)
{
{
Tracker.EnterFragmentSpread?.Invoke(fragmentSpread);
}
return(base.BeginVisitFragmentSpread(fragmentSpread));
}
private FragmentSpread BuildInlineFragment(Node selNode)
{
// Create fragment def and fragment spread
var fragmDefs = _requestContext.ParsedRequest.Fragments;
var fragmDef = new FragmentDef()
{
IsInline = true, Name = "_inline_" + fragmDefs.Count
};
fragmDefs.Add(fragmDef);
// note: On-type is optional, spec mentions this: https://spec.graphql.org/June2018/#sec-Inline-Fragments
var typeNameNode = selNode.FindChild(TermNames.TypeCondOpt)?.FindChild(TermNames.Name);
if (typeNameNode != null)
{
var onTypeName = typeNameNode.GetText();
fragmDef.OnTypeRef = new OnTypeRef()
{
Name = onTypeName, SourceLocation = typeNameNode.GetLocation(), Parent = fragmDef
};
} //if
// Selection set
var selSetNode = selNode.FindChild(TermNames.SelSet);
var items = BuildSelectionItemsList(selSetNode, fragmDef);
fragmDef.SelectionSubset = new SelectionSubset(fragmDef, items, selSetNode.GetLocation());
// fragment spread
var fragm = new FragmentSpread()
{
Fragment = fragmDef, Name = fragmDef.Name, IsInline = true, SourceLocation = selNode.GetLocation()
};
//Directives
var dirListNode = selNode.FindChild(TermNames.DirListOpt);
fragm.Directives = BuildDirectives(dirListNode, DirectiveLocation.InlineFragment, fragm);
return(fragm);
}
private MappedFragmentSpread MapFragmentSpread(FragmentSpread fs, ObjectTypeDef objectTypeDef, bool isForUnion)
{
// if it is not inline fragment, it might need to map to FragmentDef; inline fragments are auto-mapped at construction
if (fs.Fragment == null)
{
fs.Fragment = GetFragmentDef(fs.Name);
}
if (fs.Fragment == null)
{
AddError($"Fragment {fs.Name} not defined.", fs);
return(null);
}
// inline fragments are mapped in-place, here.
// we need to map them here, once we know the target type
if (fs.IsInline)
{
var onTypeRef = fs.Fragment.OnTypeRef;
var skip = onTypeRef != null && onTypeRef.TypeDef != objectTypeDef;
if (skip)
{
return(null);
}
MapObjectSelectionSubset(fs.Fragment.SelectionSubset, objectTypeDef, fs.Directives, isForUnion);
}
// there must be mapped field set now
var mappedFragmItemSet = fs.Fragment.SelectionSubset.MappedItemSets.FirstOrDefault(fset => fset.ObjectTypeDef == objectTypeDef);
if (mappedFragmItemSet == null)
{
AddError($"FATAL: Could not retrieve mapped item list for fragment spread {fs.Name}", fs, ErrorCodes.ServerError);
return(null);
}
var mappedSpread = new MappedFragmentSpread(fs, mappedFragmItemSet.Items);
return(mappedSpread);
}
public virtual void Leave(FragmentSpread selection)
{
}
public virtual void Enter(FragmentSpread selection)
{
}
private void Serialize(FragmentSpread fragmentSpread, StringBuilder builder)
{
builder.Append("...");
builder.Append(fragmentSpread.Name);
}
public virtual FragmentSpread BeginVisitFragmentSpread(
FragmentSpread fragmentSpread)
{
return(fragmentSpread);
}
/// <summary>
/// Initializes a new instance with the specified properties.
/// </summary>
public PossibleFragmentSpreadsError(ValidationContext context, FragmentSpread node, IGraphType parentType, IGraphType fragType)
: base(context.OriginalQuery, NUMBER, TypeIncompatibleSpreadMessage(node.Name, context.Print(parentType), context.Print(fragType)), node)
{
}
/// <summary>
/// Initializes a new instance with the specified properties.
/// </summary>
public KnownFragmentNamesError(ValidationContext context, FragmentSpread node, string fragmentName)
: base(context.Document.OriginalQuery !, NUMBER, UnknownFragmentMessage(fragmentName), node)
protected override void EnterFragmentSpread(PrinterContext context, FragmentSpread fragmentSpread)
{
context.Append("...");
context.Append(fragmentSpread.FragmentName);
}
public ExecutionDocumentWalkerOptions Add(object visitor)
{
if (visitor is IVisit <ExecutableDocument> ed)
{
ExecutableDocument.Add(ed);
}
if (visitor is IVisit <FragmentDefinition> fd)
{
FragmentDefinition.Add(fd);
}
if (visitor is IVisit <OperationDefinition> od)
{
OperationDefinition.Add(od);
}
if (visitor is IVisit <SelectionSet> ss)
{
SelectionSet.Add(ss);
}
if (visitor is IVisit <ISelection> s)
{
Selection.Add(s);
}
if (visitor is IVisit <FieldSelection> fs)
{
FieldSelection.Add(fs);
}
if (visitor is IVisit <InlineFragment> ift)
{
InlineFragment.Add(ift);
}
if (visitor is IVisit <FragmentSpread> fgs)
{
FragmentSpread.Add(fgs);
}
if (visitor is IVisit <Argument> arg)
{
Argument.Add(arg);
}
if (visitor is IVisit <NamedType> nt)
{
NamedType.Add(nt);
}
if (visitor is IVisit <VariableDefinition> vd)
{
VariableDefinition.Add(vd);
}
if (visitor is IVisit <DefaultValue> dv)
{
DefaultValue.Add(dv);
}
if (visitor is IVisit <Value> v)
{
Value.Add(v);
}
if (visitor is IVisit <Directive> d)
{
Directive.Add(d);
}
if (visitor is IVisit <TypeBase> t)
{
Type.Add(t);
}
return(this);
}
protected virtual void ExitFragmentSpread(TContext context, FragmentSpread fragmentSpread)
{
}