isValidNameError()

Complexity

Conditions	5
Paths	3

Size

Total Lines	19
Code Lines	10

Duplication

Lines	0
Ratio	0 %

Importance

Changes

0

<?php
function isValidNameError(string $name, ?NodeInterface $node = null): ?ValidationException
{
    invariant(\is_string($name), 'Expected string');

    if (\strlen($name) > 1 && $name{0} === '_' && $name{1} === '_') {
        return new ValidationException(
            sprintf('Name "%s" must not begin with "__", which is reserved by GraphQL introspection.', $name),
            [$node]
        );
    }

    if (preg_match("/^[_a-zA-Z][_a-zA-Z0-9]*$/", $name) === 0) {
        return new ValidationException(
            sprintf('Names must match /^[_a-zA-Z][_a-zA-Z0-9]*$/ but "%s" does not.', $name),
            [$node]
        );
    }

    return null;
}