function NullsafeTokenEmulator::emulate

Overrides TokenEmulator::emulate

File

vendor/nikic/php-parser/lib/PhpParser/Lexer/TokenEmulator/NullsafeTokenEmulator.php, line 17

Class

NullsafeTokenEmulator

Namespace

PhpParser\Lexer\TokenEmulator

Code

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;
}