Viewing file:  NullsafeTokenEmulator.php (2.23 KB) -rw-rw-rw-
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<?php declare(strict_types=1);
namespace PhpParser\Lexer\TokenEmulator;
use PhpParser\PhpVersion;
use PhpParser\Token;
final class NullsafeTokenEmulator extends TokenEmulator {
public function getPhpVersion(): PhpVersion {
return PhpVersion::fromComponents(8, 0);
}
public function isEmulationNeeded(string $code): bool {
return strpos($code, '?->') !== false;
}
public function emulate(string $code, array $tokens): array {
// We need to manually iterate and manage a count because we'll change
// the tokens array on the way
for ($i = 0, $c = count($tokens); $i < $c; ++$i) {
$token = $tokens[$i];
if ($token->text === '?' && isset($tokens[$i + 1]) && $tokens[$i + 1]->id === \T_OBJECT_OPERATOR) {
array_splice($tokens, $i, 2, [
new Token(\T_NULLSAFE_OBJECT_OPERATOR, '?->', $token->line, $token->pos),
]);
$c--;
continue;
}
// Handle ?-> inside encapsed string.
if ($token->id === \T_ENCAPSED_AND_WHITESPACE && isset($tokens[$i - 1])
&& $tokens[$i - 1]->id === \T_VARIABLE
&& preg_match('/^\?->([a-zA-Z_\x80-\xff][a-zA-Z0-9_\x80-\xff]*)/', $token->text, $matches)
) {
$replacement = [
new Token(\T_NULLSAFE_OBJECT_OPERATOR, '?->', $token->line, $token->pos),
new Token(\T_STRING, $matches[1], $token->line, $token->pos + 3),
];
$matchLen = \strlen($matches[0]);
if ($matchLen !== \strlen($token->text)) {
$replacement[] = new Token(
\T_ENCAPSED_AND_WHITESPACE,
\substr($token->text, $matchLen),
$token->line, $token->pos + $matchLen
);
}
array_splice($tokens, $i, 1, $replacement);
$c += \count($replacement) - 1;
continue;
}
}
return $tokens;
}
public function reverseEmulate(string $code, array $tokens): array {
// ?-> was not valid code previously, don't bother.
return $tokens;
}
}
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