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<?php declare(strict_types=1);
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namespace PhpParser\Lexer\TokenEmulator;
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abstract class KeywordEmulator extends TokenEmulator
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{
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abstract function getKeywordString(): string;
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abstract function getKeywordToken(): int;
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public function isEmulationNeeded(string $code): bool
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{
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return strpos(strtolower($code), $this->getKeywordString()) !== false;
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}
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protected function isKeywordContext(array $tokens, int $pos): bool
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{
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$previousNonSpaceToken = $this->getPreviousNonSpaceToken($tokens, $pos);
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return $previousNonSpaceToken === null || $previousNonSpaceToken[0] !== \T_OBJECT_OPERATOR;
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}
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public function emulate(string $code, array $tokens): array
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{
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$keywordString = $this->getKeywordString();
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foreach ($tokens as $i => $token) {
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if ($token[0] === T_STRING && strtolower($token[1]) === $keywordString
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&& $this->isKeywordContext($tokens, $i)) {
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$tokens[$i][0] = $this->getKeywordToken();
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}
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}
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return $tokens;
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}
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/**
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* @param mixed[] $tokens
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* @return array|string|null
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*/
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private function getPreviousNonSpaceToken(array $tokens, int $start)
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{
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for ($i = $start - 1; $i >= 0; --$i) {
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if ($tokens[$i][0] === T_WHITESPACE) {
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continue;
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}
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return $tokens[$i];
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}
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return null;
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}
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public function reverseEmulate(string $code, array $tokens): array
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{
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$keywordToken = $this->getKeywordToken();
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foreach ($tokens as $i => $token) {
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if ($token[0] === $keywordToken) {
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$tokens[$i][0] = \T_STRING;
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}
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}
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return $tokens;
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}
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}
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