Break visitor
|
public static stop ( ) : |
||
| return | ||
public function testAllowsEarlyExitWhileVisiting()
{
$visited = [];
$ast = Parser::parse('{ a, b { x }, c }');
Visitor::visit($ast, ['enter' => function (Node $node) use(&$visited) {
$visited[] = ['enter', $node->kind, isset($node->value) ? $node->value : null];
if ($node instanceof Name && $node->value === 'x') {
return Visitor::stop();
}
}, 'leave' => function (Node $node) use(&$visited) {
$visited[] = ['leave', $node->kind, isset($node->value) ? $node->value : null];
}]);
$expected = [['enter', 'Document', null], ['enter', 'OperationDefinition', null], ['enter', 'SelectionSet', null], ['enter', 'Field', null], ['enter', 'Name', 'a'], ['leave', 'Name', 'a'], ['leave', 'Field', null], ['enter', 'Field', null], ['enter', 'Name', 'b'], ['leave', 'Name', 'b'], ['enter', 'SelectionSet', null], ['enter', 'Field', null], ['enter', 'Name', 'x']];
$this->assertEquals($expected, $visited);
}
/**
* @it allows early exit from leaving different points
*/
public function testAllowsEarlyExitFromLeavingDifferentPoints()
{
$visited = [];
$ast = Parser::parse('{ a { y }, b { x } }');
Visitor::visit($ast, Visitor::visitInParallel([['enter' => function ($node) use(&$visited) {
$visited[] = ['break-a', 'enter', $node->kind, isset($node->value) ? $node->value : null];
}, 'leave' => function ($node) use(&$visited) {
$visited[] = ['break-a', 'leave', $node->kind, isset($node->value) ? $node->value : null];
if ($node->kind === 'Field' && isset($node->name->value) && $node->name->value === 'a') {
return Visitor::stop();
}
}], ['enter' => function ($node) use(&$visited) {
$visited[] = ['break-b', 'enter', $node->kind, isset($node->value) ? $node->value : null];
}, 'leave' => function ($node) use(&$visited) {
$visited[] = ['break-b', 'leave', $node->kind, isset($node->value) ? $node->value : null];
if ($node->kind === 'Field' && isset($node->name->value) && $node->name->value === 'b') {
return Visitor::stop();
}
}]]));
$this->assertEquals([['break-a', 'enter', 'Document', null], ['break-b', 'enter', 'Document', null], ['break-a', 'enter', 'OperationDefinition', null], ['break-b', 'enter', 'OperationDefinition', null], ['break-a', 'enter', 'SelectionSet', null], ['break-b', 'enter', 'SelectionSet', null], ['break-a', 'enter', 'Field', null], ['break-b', 'enter', 'Field', null], ['break-a', 'enter', 'Name', 'a'], ['break-b', 'enter', 'Name', 'a'], ['break-a', 'leave', 'Name', 'a'], ['break-b', 'leave', 'Name', 'a'], ['break-a', 'enter', 'SelectionSet', null], ['break-b', 'enter', 'SelectionSet', null], ['break-a', 'enter', 'Field', null], ['break-b', 'enter', 'Field', null], ['break-a', 'enter', 'Name', 'y'], ['break-b', 'enter', 'Name', 'y'], ['break-a', 'leave', 'Name', 'y'], ['break-b', 'leave', 'Name', 'y'], ['break-a', 'leave', 'Field', null], ['break-b', 'leave', 'Field', null], ['break-a', 'leave', 'SelectionSet', null], ['break-b', 'leave', 'SelectionSet', null], ['break-a', 'leave', 'Field', null], ['break-b', 'leave', 'Field', null], ['break-b', 'enter', 'Field', null], ['break-b', 'enter', 'Name', 'b'], ['break-b', 'leave', 'Name', 'b'], ['break-b', 'enter', 'SelectionSet', null], ['break-b', 'enter', 'Field', null], ['break-b', 'enter', 'Name', 'x'], ['break-b', 'leave', 'Name', 'x'], ['break-b', 'leave', 'Field', null], ['break-b', 'leave', 'SelectionSet', null], ['break-b', 'leave', 'Field', null]], $visited);
}
