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