/// <summary>
/// Parses a fragment definition.
/// <see cref="FragmentDefinitionNode" />:
/// fragment FragmentName on TypeCondition Directives? SelectionSet
/// </summary>
/// <param name="context">The parser context.</param>
private static FragmentDefinitionNode ParseFragmentDefinition(
ParserContext context)
{
SyntaxToken start = context.Current;
context.ExpectFragmentKeyword();
// Experimental support for defining variables within fragments
// changesthe grammar of FragmentDefinition:
// fragment FragmentName VariableDefinitions? on TypeCondition Directives? SelectionSet
if (context.Options.Experimental.AllowFragmentVariables)
{
NameNode name = ParseFragmentName(context);
List <VariableDefinitionNode> variableDefinitions =
ParseVariableDefinitions(context);
context.ExpectOnKeyword();
NamedTypeNode typeCondition = ParseNamedType(context);
List <DirectiveNode> directives =
ParseDirectives(context, false);
SelectionSetNode selectionSet = ParseSelectionSet(context);
Location location = context.CreateLocation(start);
return(new FragmentDefinitionNode
(
location,
name,
variableDefinitions,
typeCondition,
directives,
selectionSet
));
}
else
{
NameNode name = ParseFragmentName(context);
context.ExpectOnKeyword();
NamedTypeNode typeCondition = ParseNamedType(context);
List <DirectiveNode> directives =
ParseDirectives(context, false);
SelectionSetNode selectionSet = ParseSelectionSet(context);
Location location = context.CreateLocation(start);
return(new FragmentDefinitionNode
(
location,
name,
Array.Empty <VariableDefinitionNode>(),
typeCondition,
directives,
selectionSet
));
}
}
