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