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< ? php
/*
* This file is part of the Symfony package .
*
* ( c ) Fabien Potencier < fabien @ symfony . com >
*
* For the full copyright and license information , please view the LICENSE
* file that was distributed with this source code .
*/
namespace Symfony\Component\String ;
/**
* A string whose value is computed lazily by a callback .
*
* @ author Nicolas Grekas < p @ tchwork . com >
*/
class LazyString implements \Stringable , \JsonSerializable
{
private \Closure | string $value ;
/**
* @ param callable | array $callback A callable or a [ Closure , method ] lazy - callable
*/
public static function fromCallable ( callable | array $callback , mixed ... $arguments ) : static
{
if ( \is_array ( $callback ) && ! \is_callable ( $callback ) && ! (( $callback [ 0 ] ? ? null ) instanceof \Closure || 2 < \count ( $callback ))) {
throw new \TypeError ( sprintf ( 'Argument 1 passed to "%s()" must be a callable or a [Closure, method] lazy-callable, "%s" given.' , __METHOD__ , '[' . implode ( ', ' , array_map ( 'get_debug_type' , $callback )) . ']' ));
}
$lazyString = new static ();
$lazyString -> value = static function () use ( & $callback , & $arguments ) : string {
static $value ;
if ( null !== $arguments ) {
if ( ! \is_callable ( $callback )) {
$callback [ 0 ] = $callback [ 0 ]();
$callback [ 1 ] ? ? = '__invoke' ;
}
$value = $callback ( ... $arguments );
$callback = ! \is_scalar ( $value ) && ! $value instanceof \Stringable ? self :: getPrettyName ( $callback ) : 'callable' ;
$arguments = null ;
}
return $value ? ? '' ;
};
return $lazyString ;
}
public static function fromStringable ( string | int | float | bool | \Stringable $value ) : static
{
if ( \is_object ( $value )) {
return static :: fromCallable ( $value -> __toString ( ... ));
}
$lazyString = new static ();
$lazyString -> value = ( string ) $value ;
return $lazyString ;
}
/**
* Tells whether the provided value can be cast to string .
*/
final public static function isStringable ( mixed $value ) : bool
{
return \is_string ( $value ) || $value instanceof \Stringable || \is_scalar ( $value );
}
/**
* Casts scalars and stringable objects to strings .
*
* @ throws \TypeError When the provided value is not stringable
*/
final public static function resolve ( \Stringable | string | int | float | bool $value ) : string
{
return $value ;
}
public function __toString () : string
{
if ( \is_string ( $this -> value )) {
return $this -> value ;
}
try {
return $this -> value = ( $this -> value )();
} catch ( \Throwable $e ) {
if ( \TypeError :: class === $e :: class && __FILE__ === $e -> getFile ()) {
$type = explode ( ', ' , $e -> getMessage ());
$type = substr ( array_pop ( $type ), 0 , - \strlen ( ' returned' ));
$r = new \ReflectionFunction ( $this -> value );
$callback = $r -> getStaticVariables ()[ 'callback' ];
$e = new \TypeError ( sprintf ( 'Return value of %s() passed to %s::fromCallable() must be of the type string, %s returned.' , $callback , static :: class , $type ));
}
throw $e ;
}
}
public function __sleep () : array
{
$this -> __toString ();
return [ 'value' ];
}
public function jsonSerialize () : string
{
return $this -> __toString ();
}
private function __construct ()
{
}
private static function getPrettyName ( callable $callback ) : string
{
if ( \is_string ( $callback )) {
return $callback ;
}
if ( \is_array ( $callback )) {
$class = \is_object ( $callback [ 0 ]) ? get_debug_type ( $callback [ 0 ]) : $callback [ 0 ];
$method = $callback [ 1 ];
} elseif ( $callback instanceof \Closure ) {
$r = new \ReflectionFunction ( $callback );
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if ( str_contains ( $r -> name , '{closure' ) || ! $class = $r -> getClosureCalledClass ()) {
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return $r -> name ;
}
$class = $class -> name ;
$method = $r -> name ;
} else {
$class = get_debug_type ( $callback );
$method = '__invoke' ;
}
return $class . '::' . $method ;
}
}