/**
* Given a type and a value AST node known to match this type, build a
* runtime value.
*/
private static function coerceValueAST(Type $type, $valueAST, $variables)
{
if ($type instanceof NonNull) {
// Note: we're not checking that the result of coerceValueAST is non-null.
// We're assuming that this query has been validated and the value used
// here is of the correct type.
return self::coerceValueAST($type->getWrappedType(), $valueAST, $variables);
}
if (!$valueAST) {
return null;
}
if ($valueAST->kind === Node::VARIABLE) {
$variableName = $valueAST->name->value;
if (!isset($variables, $variables[$variableName])) {
return null;
}
// Note: we're not doing any checking that this variable is correct. We're
// assuming that this query has been validated and the variable usage here
// is of the correct type.
return $variables[$variableName];
}
if ($type instanceof ListOfType) {
$itemType = $type->getWrappedType();
if ($valueAST->kind === Node::ARR) {
$tmp = [];
foreach ($valueAST->values as $itemAST) {
$tmp[] = self::coerceValueAST($itemType, $itemAST, $variables);
}
return $tmp;
} else {
return [self::coerceValueAST($itemType, $valueAST, $variables)];
}
}
if ($type instanceof InputObjectType) {
$fields = $type->getFields();
if ($valueAST->kind !== Node::OBJECT) {
return null;
}
$fieldASTs = Utils::keyMap($valueAST->fields, function ($field) {
return $field->name->value;
});
$obj = [];
foreach ($fields as $fieldName => $field) {
$fieldAST = $fieldASTs[$fieldName];
$fieldValue = self::coerceValueAST($field->getType(), $fieldAST ? $fieldAST->value : null, $variables);
$obj[$fieldName] = $fieldValue === null ? $field->defaultValue : $fieldValue;
}
return $obj;
}
if ($type instanceof ScalarType || $type instanceof EnumType) {
$coerced = $type->coerceLiteral($valueAST);
if (null !== $coerced) {
return $coerced;
}
}
return null;
}
