Typehints for PHP 7.4

typehints.php

<?php

declare(strict_types=1);

require '/nette.phar';


class TypeHints
{
	public $ignoredTypes = ['mixed', 'resource'];


	public function update($file)
	{
		$s = file_get_contents($file);
		$s = str_replace("\r\n", "\n", $s);

		$s = preg_replace_callback('#((?>\n[ \t]*\/\*\*.+\*\/))?(\s+)((?:var |public |protected |private |static )+)(\$\w++)(\s*=\s*([^\s;]++))?+()#sU',
			function ($m) {
				list(, $doc, $inter, $keywords, $name, $trailing, $default) = $m;

				$hint = '';
				$this->processProperty($doc, $default, $hint);

				if (trim($doc, "/* \t\n") === '') {
					$doc = '';
				}

				return $doc . $inter . $keywords . ($hint ? $hint . ' ' : '') . $name . $trailing;
			}, $s);

		$s = str_replace("\n", "\r\n", $s);
		file_put_contents($file, $s);
	}


	private function processProperty(string &$doc, string $default, string &$propHint): void
	{
		$propHint = '';
		if ($doc) {
			$doc = preg_replace_callback(
				'#\n[ \t]*/?\*+ *@var +(\S+)( +[^*]*)?()#',

				function (array $m) use (&$propHint) {
					list($line, $type, $info) = $m;
					$nnType = str_ireplace(['?', '|null'], '', $type);
					$nullable = $type !== $nnType ? '?' : '';

					if (in_array($nnType, $this->ignoredTypes, true)) {

					} elseif ($nnType === 'static') {
						$propHint = $nullable . 'self';

					} elseif (preg_match('#^[\w\\\\]+\[\]\z#', $nnType)) {
						$propHint = $nullable . 'array';

					} elseif (preg_match('#^[\w\\\\]+\z#', $nnType)) {
						$propHint = $nullable . $nnType;
						if (!trim($info)) {
							return '';
						}
					}
					return $line;
				},
				$doc
			);
			return;
		}

		$ch = substr($default, 0, 1);
		if ($ch === '[') {
			$propHint = 'array';
		} elseif ($ch === '"' || $ch === "'") {
			$propHint = 'string';
		} elseif ($default === 'true' || $default === false) {
			$propHint = 'bool';
		} elseif (is_numeric($default)) {
			$propHint = 'int';
		}
	}
}


$updater = new TypeHints;

foreach (Nette\Utils\Finder::findFiles('*.php')->from(__DIR__) as $file) {
	echo $file, "\n";
	$updater->update((string) $file);
}