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