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<?php |
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namespace Schnittstabil\Curty; |
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use stdClass; |
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use Closure; |
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use Schnittstabil\Get\Get; |
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/** |
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* Curty micro templating. |
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*/ |
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class Curty |
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{ |
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private static $notFoundSymbol = null; |
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/** |
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* @var callable Callable to get values and object properties from contexts |
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*/ |
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protected $get; |
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/** |
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* Create a Curty template renderer. |
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* |
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* @param callable Callable to get values and object properties from contexts |
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*/ |
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public function __construct(callable $get = null) |
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{ |
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$this->get = $get ?? [Get::class, 'value']; |
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} |
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/** |
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* Render template until a fixed point is reached. |
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* |
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* @param string $tpl Curty template |
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* @param object|array $context Variable mapping |
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* |
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* @return string |
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*/ |
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public function __invoke(string $tpl, $context) : string |
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{ |
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do { |
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$old = $tpl; |
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$tpl = $this->render($tpl, $context); |
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} while ($tpl !== $old); |
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return $tpl; |
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} |
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/** |
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* Render template. |
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* |
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* @param string $tpl Curty template |
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* @param object|array $context Variable mapping |
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* |
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* @return string |
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*/ |
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public function render(string $tpl, $context) : string |
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{ |
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if (!preg_match_all('/{{([^{]+?)}}/', $tpl, $matches)) { |
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return $tpl; |
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} |
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foreach ($matches[1] as $key) { |
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$replace = $this->getValue($key, $context); |
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if ($replace !== static::getNotFoundSymbol()) { |
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$tpl = str_replace('{{'.$key.'}}', $this->renderValue($replace), $tpl); |
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} |
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} |
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return $tpl; |
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} |
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protected function getValue(string $key, $context) |
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{ |
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$get = $this->get; |
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$value = $get($key, $context, static::getNotFoundSymbol()); |
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if ($value instanceof Closure) { |
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return $value($this); |
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} |
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return $value; |
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} |
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protected function renderValue($value) : string |
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{ |
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if (is_bool($value)) { |
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return var_export($value, true); |
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} |
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if (is_scalar($value) || method_exists($value, '__toString')) { |
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return (string) $value; |
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} |
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return @json_encode($value, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE | JSON_PRESERVE_ZERO_FRACTION); |
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} |
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protected static function getNotFoundSymbol() |
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{ |
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if (self::$notFoundSymbol === null) { |
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self::$notFoundSymbol = new stdClass(); |
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} |
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return self::$notFoundSymbol; |
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} |
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} |
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schnittstabil /
curty
