| public static loadClosest ( string $context = '' ) : string | ||
| $context | string | Name of the context or full class name that defines the context. |
| return | string | The loaded context. `null` if no context was loaded. |
public static function loadClosest($context = '')
{
/**
* The number of replaces done by `preg_replace`.
* This actually represents whether a new context was generated or not.
*
* @var int $count
*/
$count = 0;
// As long as a new context can be generated, we try to load it.
do {
try {
// Trying to load the new context.
static::load($context);
} catch (\Exception $e) {
// If it didn't work, we are looking for a new one and skipping
// over to the next generation that will try the new context.
$context = preg_replace('/[1-9](0*)$/', '0$1', $context, -1, $count);
continue;
}
// Last generated context was valid (did not throw any exceptions).
// So we return it, to let the user know what context was loaded.
return $context;
} while ($count !== 0);
return null;
} public function testLoad()
{
// Default context is 5.7.0.
$this->assertEquals('\\SqlParser\\Contexts\\ContextMySql50700', Context::$loadedContext);
$this->assertTrue(isset(Context::$KEYWORDS['STORED']));
$this->assertFalse(isset(Context::$KEYWORDS['AUTHORS']));
Context::load('MySql50600');
$this->assertEquals('\\SqlParser\\Contexts\\ContextMySql50600', Context::$loadedContext);
$this->assertFalse(isset(Context::$KEYWORDS['STORED']));
$this->assertTrue(isset(Context::$KEYWORDS['AUTHORS']));
Context::loadClosest('MySql50712');
$this->assertEquals('\\SqlParser\\Contexts\\ContextMySql50700', Context::$loadedContext);
$this->assertEquals(null, Context::loadClosest('Sql'));
// Restoring context.
Context::load('');
$this->assertEquals('\\SqlParser\\Contexts\\ContextMySql50700', Context::$defaultContext);
$this->assertTrue(isset(Context::$KEYWORDS['STORED']));
$this->assertFalse(isset(Context::$KEYWORDS['AUTHORS']));
}
