/**
* Coroutine to walk the query and schema in DFS manner (see AbstractQueryVisitor docs for more info) and yield a
* tuple of (queryNode, schemaNode, childScore)
*
* childScore costs are accumulated via values sent into the coroutine.
*
* Most of the branching in this function is just to handle the different types in a query: Queries, Unions,
* Fragments (anonymous and named), and Fields. The core of the function is simple: recurse until we hit the base
* case of a Field and yield that back up to the visitor up in `doVisit`.
*
* @param Query|Field|\Youshido\GraphQL\Parser\Ast\Interfaces\FragmentInterface $queryNode
* @param FieldInterface $currentLevelAST
*
* @return \Generator
*/
protected function walkQuery($queryNode, FieldInterface $currentLevelAST)
{
$childrenScore = 0;
if (!$queryNode instanceof FieldAst) {
foreach ($queryNode->getFields() as $queryField) {
if ($queryField instanceof FragmentInterface) {
if ($queryField instanceof FragmentReference) {
$queryField = $this->executionContext->getRequest()->getFragment($queryField->getName());
}
// the next 7 lines are essentially equivalent to `yield from $this->walkQuery(...)` in PHP7.
// for backwards compatibility this is equivalent.
// This pattern is repeated multiple times in this function, and unfortunately cannot be extracted or
// made less verbose.
$gen = $this->walkQuery($queryField, $currentLevelAST);
$next = $gen->current();
while ($next) {
$received = (yield $next);
$childrenScore += (int) $received;
$next = $gen->send($received);
}
} else {
$fieldType = $currentLevelAST->getType()->getNamedType();
if ($fieldType instanceof AbstractUnionType) {
foreach ($fieldType->getTypes() as $unionFieldType) {
if ($fieldAst = $unionFieldType->getField($queryField->getName())) {
$gen = $this->walkQuery($queryField, $fieldAst);
$next = $gen->current();
while ($next) {
$received = (yield $next);
$childrenScore += (int) $received;
$next = $gen->send($received);
}
}
}
} elseif ($fieldType instanceof AbstractObjectType && ($fieldAst = $fieldType->getField($queryField->getName()))) {
$gen = $this->walkQuery($queryField, $fieldAst);
$next = $gen->current();
while ($next) {
$received = (yield $next);
$childrenScore += (int) $received;
$next = $gen->send($received);
}
}
}
}
}
// sanity check. don't yield fragments; they don't contribute to cost
if ($queryNode instanceof Query || $queryNode instanceof FieldAst) {
// BASE CASE. If we're here we're done recursing -
// this node is either a field, or a query that we've finished recursing into.
(yield [$queryNode, $currentLevelAST, $childrenScore]);
}
}
protected function resolveQuery(AstQuery $query)
{
$schema = $this->executionContext->getSchema();
$type = $query instanceof AstMutation ? $schema->getMutationType() : $schema->getQueryType();
$field = new Field(['name' => $query instanceof AstMutation ? 'mutation' : 'query', 'type' => $type]);
if (self::TYPE_NAME_QUERY == $query->getName()) {
return [$this->getAlias($query) => $type->getName()];
}
$this->resolveValidator->assetTypeHasField($type, $query);
$value = $this->resolveField($field, $query);
return [$this->getAlias($query) => $value];
}
public function testQuery()
{
$arguments = [new Argument('limit', new Literal('10', new Location(1, 1)), new Location(1, 1))];
$fields = [new Field('id', null, [], new Location(1, 1))];
$query = new Query('ships', 'lastShips', $arguments, $fields, new Location(1, 1));
$this->assertEquals('ships', $query->getName());
$this->assertEquals('lastShips', $query->getAlias());
$this->assertEquals($arguments, $query->getArguments());
$this->assertEquals(['limit' => '10'], $query->getKeyValueArguments());
$this->assertEquals($fields, $query->getFields());
$this->assertTrue($query->hasArguments());
$this->assertTrue($query->hasFields());
$query->setFields([]);
$query->setArguments([]);
$this->assertEmpty($query->getArguments());
$this->assertEmpty($query->getFields());
$this->assertEmpty($query->getKeyValueArguments());
$this->assertFalse($query->hasArguments());
$this->assertFalse($query->hasFields());
$query->addArgument(new Argument('offset', new Literal(10, new Location(1, 1)), new Location(1, 1)));
$this->assertTrue($query->hasArguments());
}
