Viewing file:  NullsafeTokenEmulator.php (2.16 KB) -rwxrwxr-x
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<?php declare(strict_types=1);
namespace PhpParser\Lexer\TokenEmulator;
use PhpParser\Lexer\Emulative;
final class NullsafeTokenEmulator extends TokenEmulator
{
public function getPhpVersion(): string
{
return Emulative::PHP_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
$line = 1;
for ($i = 0, $c = count($tokens); $i < $c; ++$i) {
if ($tokens[$i] === '?' && isset($tokens[$i + 1]) && $tokens[$i + 1][0] === \T_OBJECT_OPERATOR) {
array_splice($tokens, $i, 2, [
[\T_NULLSAFE_OBJECT_OPERATOR, '?->', $line]
]);
$c--;
continue;
}
// Handle ?-> inside encapsed string.
if ($tokens[$i][0] === \T_ENCAPSED_AND_WHITESPACE && isset($tokens[$i - 1])
&& $tokens[$i - 1][0] === \T_VARIABLE
&& preg_match('/^\?->([a-zA-Z_\x80-\xff][a-zA-Z0-9_\x80-\xff]*)/', $tokens[$i][1], $matches)
) {
$replacement = [
[\T_NULLSAFE_OBJECT_OPERATOR, '?->', $line],
[\T_STRING, $matches[1], $line],
];
if (\strlen($matches[0]) !== \strlen($tokens[$i][1])) {
$replacement[] = [
\T_ENCAPSED_AND_WHITESPACE,
\substr($tokens[$i][1], \strlen($matches[0])),
$line
];
}
array_splice($tokens, $i, 1, $replacement);
$c += \count($replacement) - 1;
continue;
}
if (\is_array($tokens[$i])) {
$line += substr_count($tokens[$i][1], "\n");
}
}
return $tokens;
}
public function reverseEmulate(string $code, array $tokens): array
{
// ?-> was not valid code previously, don't bother.
return $tokens;
}
}
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