name : compatibility_tokens.php <?php declare(strict_types=1); namespace PhpParser; if (!\function_exists('PhpParser\defineCompatibilityTokens')) { function defineCompatibilityTokens(): void { $compatTokens = [ // PHP 8.0 'T_NAME_QUALIFIED', 'T_NAME_FULLY_QUALIFIED', 'T_NAME_RELATIVE', 'T_MATCH', 'T_NULLSAFE_OBJECT_OPERATOR', 'T_ATTRIBUTE', // PHP 8.1 'T_ENUM', 'T_AMPERSAND_NOT_FOLLOWED_BY_VAR_OR_VARARG', 'T_AMPERSAND_FOLLOWED_BY_VAR_OR_VARARG', 'T_READONLY', ]; // PHP-Parser might be used together with another library that also emulates some or all // of these tokens. Perform a sanity-check that all already defined tokens have been // assigned a unique ID. $usedTokenIds = []; foreach ($compatTokens as $token) { if (\defined($token)) { $tokenId = \constant($token); if (!\is_int($tokenId)) { throw new \Error(sprintf( 'Token %s has ID of type %s, should be int. ' . 'You may be using a library with broken token emulation', $token, \gettype($tokenId) )); } $clashingToken = $usedTokenIds[$tokenId] ?? null; if ($clashingToken !== null) { throw new \Error(sprintf( 'Token %s has same ID as token %s, ' . 'you may be using a library with broken token emulation', $token, $clashingToken )); } $usedTokenIds[$tokenId] = $token; } } // Now define any tokens that have not yet been emulated. Try to assign IDs from -1 // downwards, but skip any IDs that may already be in use. $newTokenId = -1; foreach ($compatTokens as $token) { if (!\defined($token)) { while (isset($usedTokenIds[$newTokenId])) { $newTokenId--; } \define($token, $newTokenId); $newTokenId--; } } } defineCompatibilityTokens(); }