/**
* Not exactly the same as the executor's definition of getFieldDef, in this
* statically evaluated environment we do not always have an Object type,
* and need to handle Interface and Union types.
*
* @param Schema $schema
* @param Type $parentType
* @param Field $fieldAST
*
* @return FieldDefinition
*/
protected static function getFieldDefinition(Schema $schema, Type $parentType, Field $fieldAST)
{
$name = $fieldAST->get('name')->get('value');
$schemaMeta = Introspection::schemaMetaFieldDefinition();
if ($name === $schemaMeta->getName() && $schema->getQueryType() === $parentType) {
return $schemaMeta;
}
$typeMeta = Introspection::typeMetaFieldDefinition();
if ($name === $typeMeta->getName() && $schema->getQueryType() === $parentType) {
return $typeMeta;
}
$typeNameMeta = Introspection::typeNameMetaFieldDefinition();
if ($name === $typeNameMeta->getName() && ($parentType instanceof ObjectType || $parentType instanceof InterfaceType || $parentType instanceof UnionType)) {
return $typeNameMeta;
}
if ($parentType instanceof ObjectType || $parentType instanceof InterfaceType) {
$fields = $parentType->getFields();
return isset($fields[$name]) ? $fields[$name] : NULL;
}
return NULL;
}
