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<?php declare(strict_types=1);
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namespace PhpParser\Lexer\TokenEmulator;
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use PhpParser\Lexer\Emulative;
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final class NullsafeTokenEmulator extends TokenEmulator
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{
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public function getPhpVersion(): string
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{
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return Emulative::PHP_8_0;
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}
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public function isEmulationNeeded(string $code): bool
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{
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return strpos($code, '?->') !== false;
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}
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public function emulate(string $code, array $tokens): array
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{
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// We need to manually iterate and manage a count because we'll change
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// the tokens array on the way
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$line = 1;
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for ($i = 0, $c = count($tokens); $i < $c; ++$i) {
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if ($tokens[$i] === '?' && isset($tokens[$i + 1]) && $tokens[$i + 1][0] === \T_OBJECT_OPERATOR) {
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array_splice($tokens, $i, 2, [
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[\T_NULLSAFE_OBJECT_OPERATOR, '?->', $line]
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]);
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$c--;
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continue;
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}
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// Handle ?-> inside encapsed string.
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if ($tokens[$i][0] === \T_ENCAPSED_AND_WHITESPACE && isset($tokens[$i - 1])
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&& $tokens[$i - 1][0] === \T_VARIABLE
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&& preg_match('/^\?->([a-zA-Z_\x80-\xff][a-zA-Z0-9_\x80-\xff]*)/', $tokens[$i][1], $matches)
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) {
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$replacement = [
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[\T_NULLSAFE_OBJECT_OPERATOR, '?->', $line],
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[\T_STRING, $matches[1], $line],
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];
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if (\strlen($matches[0]) !== \strlen($tokens[$i][1])) {
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$replacement[] = [
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\T_ENCAPSED_AND_WHITESPACE,
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\substr($tokens[$i][1], \strlen($matches[0])),
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$line
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];
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}
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array_splice($tokens, $i, 1, $replacement);
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$c += \count($replacement) - 1;
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continue;
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}
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if (\is_array($tokens[$i])) {
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$line += substr_count($tokens[$i][1], "\n");
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}
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}
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return $tokens;
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}
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public function reverseEmulate(string $code, array $tokens): array
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{
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// ?-> was not valid code previously, don't bother.
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return $tokens;
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}
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}
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