晋太元中,武陵人捕鱼为业。缘溪行,忘路之远近。忽逢桃花林,夹岸数百步,中无杂树,芳草鲜美,落英缤纷。渔人甚异之,复前行,欲穷其林。 林尽水源,便得一山,山有小口,仿佛若有光。便舍船,从口入。初极狭,才通人。复行数十步,豁然开朗。土地平旷,屋舍俨然,有良田、美池、桑竹之属。阡陌交通,鸡犬相闻。其中往来种作,男女衣着,悉如外人。黄发垂髫,并怡然自乐。 见渔人,乃大惊,问所从来。具答之。便要还家,设酒杀鸡作食。村中闻有此人,咸来问讯。自云先世避秦时乱,率妻子邑人来此绝境,不复出焉,遂与外人间隔。问今是何世,乃不知有汉,无论魏晋。此人一一为具言所闻,皆叹惋。余人各复延至其家,皆出酒食。停数日,辞去。此中人语云:“不足为外人道也。”(间隔 一作:隔绝) 既出,得其船,便扶向路,处处志之。及郡下,诣太守,说如此。太守即遣人随其往,寻向所志,遂迷,不复得路。 南阳刘子骥,高尚士也,闻之,欣然规往。未果,寻病终。后遂无问津者。
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<?php declare(strict_types=1);
namespace Invoker;
use Invoker\Exception\NotCallableException;
use Invoker\Exception\NotEnoughParametersException;
use Invoker\ParameterResolver\AssociativeArrayResolver;
use Invoker\ParameterResolver\DefaultValueResolver;
use Invoker\ParameterResolver\NumericArrayResolver;
use Invoker\ParameterResolver\ParameterResolver;
use Invoker\ParameterResolver\ResolverChain;
use Invoker\Reflection\CallableReflection;
use Psr\Container\ContainerInterface;
use ReflectionParameter;
/**
* Invoke a callable.
*/
class Invoker implements InvokerInterface
{
/** @var CallableResolver|null */
private $callableResolver;
/** @var ParameterResolver */
private $parameterResolver;
/** @var ContainerInterface|null */
private $container;
public function __construct(?ParameterResolver $parameterResolver = null, ?ContainerInterface $container = null)
{
$this->parameterResolver = $parameterResolver ?: $this->createParameterResolver();
$this->container = $container;
if ($container) {
$this->callableResolver = new CallableResolver($container);
}
}
/**
* {@inheritdoc}
*/
public function call($callable, array $parameters = [])
{
if ($this->callableResolver) {
$callable = $this->callableResolver->resolve($callable);
}
if (! is_callable($callable)) {
throw new NotCallableException(sprintf(
'%s is not a callable',
is_object($callable) ? 'Instance of ' . get_class($callable) : var_export($callable, true)
));
}
$callableReflection = CallableReflection::create($callable);
$args = $this->parameterResolver->getParameters($callableReflection, $parameters, []);
// Sort by array key because call_user_func_array ignores numeric keys
ksort($args);
// Check all parameters are resolved
$diff = array_diff_key($callableReflection->getParameters(), $args);
$parameter = reset($diff);
if ($parameter && \assert($parameter instanceof ReflectionParameter) && ! $parameter->isVariadic()) {
throw new NotEnoughParametersException(sprintf(
'Unable to invoke the callable because no value was given for parameter %d ($%s)',
$parameter->getPosition() + 1,
$parameter->name
));
}
return call_user_func_array($callable, $args);
}
/**
* Create the default parameter resolver.
*/
private function createParameterResolver(): ParameterResolver
{
return new ResolverChain([
new NumericArrayResolver,
new AssociativeArrayResolver,
new DefaultValueResolver,
]);
}
/**
* @return ParameterResolver By default it's a ResolverChain
*/
public function getParameterResolver(): ParameterResolver
{
return $this->parameterResolver;
}
public function getContainer(): ?ContainerInterface
{
return $this->container;
}
/**
* @return CallableResolver|null Returns null if no container was given in the constructor.
*/
public function getCallableResolver(): ?CallableResolver
{
return $this->callableResolver;
}
}