function PhpDumper::stripComments

Removes comments from a PHP source string.

We don't use the PHP php_strip_whitespace() function as we want the content to be readable and well-formatted.

1 call to PhpDumper::stripComments()

PhpDumper::generateProxyClasses in vendor/symfony/dependency-injection/Dumper/PhpDumper.php

File

vendor/symfony/dependency-injection/Dumper/PhpDumper.php, line 2364

Class

PhpDumper

PhpDumper dumps a service container as a PHP class.

Namespace

Symfony\Component\DependencyInjection\Dumper

Code

private static function stripComments(string $source) : string {
    if (!\function_exists('token_get_all')) {
        return $source;
    }
    $rawChunk = '';
    $output = '';
    $tokens = token_get_all($source);
    $ignoreSpace = false;
    for ($i = 0; isset($tokens[$i]); ++$i) {
        $token = $tokens[$i];
        if (!isset($token[1]) || 'b"' === $token) {
            $rawChunk .= $token;
        }
        elseif (\T_START_HEREDOC === $token[0]) {
            $output .= $rawChunk . $token[1];
            do {
                $token = $tokens[++$i];
                $output .= isset($token[1]) && 'b"' !== $token ? $token[1] : $token;
            } while (\T_END_HEREDOC !== $token[0]);
            $rawChunk = '';
        }
        elseif (\T_WHITESPACE === $token[0]) {
            if ($ignoreSpace) {
                $ignoreSpace = false;
                continue;
            }
            // replace multiple new lines with a single newline
            $rawChunk .= preg_replace([
                '/\\n{2,}/S',
            ], "\n", $token[1]);
        }
        elseif (\in_array($token[0], [
            \T_COMMENT,
            \T_DOC_COMMENT,
        ])) {
            if (!\in_array($rawChunk[\strlen($rawChunk) - 1], [
                ' ',
                "\n",
                "\r",
                "\t",
            ], true)) {
                $rawChunk .= ' ';
            }
            $ignoreSpace = true;
        }
        else {
            $rawChunk .= $token[1];
            // The PHP-open tag already has a new-line
            if (\T_OPEN_TAG === $token[0]) {
                $ignoreSpace = true;
            }
            else {
                $ignoreSpace = false;
            }
        }
    }
    $output .= $rawChunk;
    unset($tokens, $rawChunk);
    gc_mem_caches();
    return $output;
}