| 1: | <?php declare(strict_types=1); |
| 2: | |
| 3: | namespace PhpParser\Lexer\TokenEmulator; |
| 4: | |
| 5: | use PhpParser\Token; |
| 6: | |
| 7: | abstract class KeywordEmulator extends TokenEmulator { |
| 8: | abstract public function getKeywordString(): string; |
| 9: | abstract public function getKeywordToken(): int; |
| 10: | |
| 11: | public function isEmulationNeeded(string $code): bool { |
| 12: | return strpos(strtolower($code), $this->getKeywordString()) !== false; |
| 13: | } |
| 14: | |
| 15: | |
| 16: | protected function isKeywordContext(array $tokens, int $pos): bool { |
| 17: | $prevToken = $this->getPreviousNonIgnorableToken($tokens, $pos); |
| 18: | if ($prevToken === null) { |
| 19: | return false; |
| 20: | } |
| 21: | return $prevToken->id !== \T_OBJECT_OPERATOR |
| 22: | && $prevToken->id !== \T_NULLSAFE_OBJECT_OPERATOR; |
| 23: | } |
| 24: | |
| 25: | public function emulate(string $code, array $tokens): array { |
| 26: | $keywordString = $this->getKeywordString(); |
| 27: | foreach ($tokens as $i => $token) { |
| 28: | if ($token->id === T_STRING && strtolower($token->text) === $keywordString |
| 29: | && $this->isKeywordContext($tokens, $i)) { |
| 30: | $token->id = $this->getKeywordToken(); |
| 31: | } |
| 32: | } |
| 33: | |
| 34: | return $tokens; |
| 35: | } |
| 36: | |
| 37: | |
| 38: | private function getPreviousNonIgnorableToken(array $tokens, int $start): ?Token { |
| 39: | for ($i = $start - 1; $i >= 0; --$i) { |
| 40: | $token = $tokens[$i]; |
| 41: | if ($token->id === T_WHITESPACE || $token->id == T_COMMENT || $token->id === T_DOC_COMMENT) { |
| 42: | continue; |
| 43: | } |
| 44: | |
| 45: | return $token; |
| 46: | } |
| 47: | |
| 48: | return null; |
| 49: | } |
| 50: | |
| 51: | public function reverseEmulate(string $code, array $tokens): array { |
| 52: | $keywordToken = $this->getKeywordToken(); |
| 53: | foreach ($tokens as $token) { |
| 54: | if ($token->id === $keywordToken) { |
| 55: | $token->id = \T_STRING; |
| 56: | } |
| 57: | } |
| 58: | |
| 59: | return $tokens; |
| 60: | } |
| 61: | } |
| 62: | |