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\Lexer\Emulative;
6:
7:	final class NullsafeTokenEmulator extends TokenEmulator
8:	{
9:	public function getPhpVersion(): string
10:	{
11:	return Emulative::PHP_8_0;
12:	}
13:
14:	public function isEmulationNeeded(string $code): bool
15:	{
16:	return strpos($code, '?->') !== false;
17:	}
18:
19:	public function emulate(string $code, array $tokens): array
20:	{
21:	// We need to manually iterate and manage a count because we'll change
22:	// the tokens array on the way
23:	$line = 1;
24:	for ($i = 0, $c = count($tokens); $i < $c; ++$i) {
25:	if ($tokens[$i] === '?' && isset($tokens[$i + 1]) && $tokens[$i + 1][0] === \T_OBJECT_OPERATOR) {
26:	array_splice($tokens, $i, 2, [
27:	[\T_NULLSAFE_OBJECT_OPERATOR, '?->', $line]
28:	]);
29:	$c--;
30:	continue;
31:	}
32:
33:	// Handle ?-> inside encapsed string.
34:	if ($tokens[$i][0] === \T_ENCAPSED_AND_WHITESPACE && isset($tokens[$i - 1])
35:	&& $tokens[$i - 1][0] === \T_VARIABLE
36:	&& preg_match('/^\?->([a-zA-Z_\x80-\xff][a-zA-Z0-9_\x80-\xff]*)/', $tokens[$i][1], $matches)
37:	) {
38:	$replacement = [
39:	[\T_NULLSAFE_OBJECT_OPERATOR, '?->', $line],
40:	[\T_STRING, $matches[1], $line],
41:	];
42:	if (\strlen($matches[0]) !== \strlen($tokens[$i][1])) {
43:	$replacement[] = [
44:	\T_ENCAPSED_AND_WHITESPACE,
45:	\substr($tokens[$i][1], \strlen($matches[0])),
46:	$line
47:	];
48:	}
49:	array_splice($tokens, $i, 1, $replacement);
50:	$c += \count($replacement) - 1;
51:	continue;
52:	}
53:
54:	if (\is_array($tokens[$i])) {
55:	$line += substr_count($tokens[$i][1], "\n");
56:	}
57:	}
58:
59:	return $tokens;
60:	}
61:
62:	public function reverseEmulate(string $code, array $tokens): array
63:	{
64:	// ?-> was not valid code previously, don't bother.
65:	return $tokens;
66:	}
67:	}
68:

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