File vendor/nikic/php-parser/lib/PhpParser/Lexer/TokenEmulator/NullsafeTokenEmulator.php

1:	<?php declare(strict_types=1);
2:
3:	namespace PhpParser\Lexer\TokenEmulator;
4:
5:	use PhpParser\PhpVersion;
6:	use PhpParser\Token;
7:
8:	final class NullsafeTokenEmulator extends TokenEmulator {
9:	public function getPhpVersion(): PhpVersion {
10:	return PhpVersion::fromComponents(8, 0);
11:	}
12:
13:	public function isEmulationNeeded(string $code): bool {
14:	return strpos($code, '?->') !== false;
15:	}
16:
17:	public function emulate(string $code, array $tokens): array {
18:	// We need to manually iterate and manage a count because we'll change
19:	// the tokens array on the way
20:	for ($i = 0, $c = count($tokens); $i < $c; ++$i) {
21:	$token = $tokens[$i];
22:	if ($token->text === '?' && isset($tokens[$i + 1]) && $tokens[$i + 1]->id === \T_OBJECT_OPERATOR) {
23:	array_splice($tokens, $i, 2, [
24:	new Token(\T_NULLSAFE_OBJECT_OPERATOR, '?->', $token->line, $token->pos),
25:	]);
26:	$c--;
27:	continue;
28:	}
29:
30:	// Handle ?-> inside encapsed string.
31:	if ($token->id === \T_ENCAPSED_AND_WHITESPACE && isset($tokens[$i - 1])
32:	&& $tokens[$i - 1]->id === \T_VARIABLE
33:	&& preg_match('/^\?->([a-zA-Z_\x80-\xff][a-zA-Z0-9_\x80-\xff]*)/', $token->text, $matches)
34:	) {
35:	$replacement = [
36:	new Token(\T_NULLSAFE_OBJECT_OPERATOR, '?->', $token->line, $token->pos),
37:	new Token(\T_STRING, $matches[1], $token->line, $token->pos + 3),
38:	];
39:	$matchLen = \strlen($matches[0]);
40:	if ($matchLen !== \strlen($token->text)) {
41:	$replacement[] = new Token(
42:	\T_ENCAPSED_AND_WHITESPACE,
43:	\substr($token->text, $matchLen),
44:	$token->line, $token->pos + $matchLen
45:	);
46:	}
47:	array_splice($tokens, $i, 1, $replacement);
48:	$c += \count($replacement) - 1;
49:	continue;
50:	}
51:	}
52:
53:	return $tokens;
54:	}
55:
56:	public function reverseEmulate(string $code, array $tokens): array {
57:	// ?-> was not valid code previously, don't bother.
58:	return $tokens;
59:	}
60:	}
61:

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