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55 lines
1.4 KiB
PHP
55 lines
1.4 KiB
PHP
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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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use PhpParser\Parser\Tokens;
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final class CoaleseEqualTokenEmulator implements TokenEmulatorInterface
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{
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const T_COALESCE_EQUAL = 1007;
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public function getTokenId(): int
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{
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return self::T_COALESCE_EQUAL;
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}
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public function getParserTokenId(): int
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{
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return Tokens::T_COALESCE_EQUAL;
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}
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public function isEmulationNeeded(string $code) : bool
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{
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// skip version where this is supported
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if (version_compare(\PHP_VERSION, Emulative::PHP_7_4, '>=')) {
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return false;
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}
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return strpos($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 (isset($tokens[$i + 1])) {
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if ($tokens[$i][0] === T_COALESCE && $tokens[$i + 1] === '=') {
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array_splice($tokens, $i, 2, [
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[self::T_COALESCE_EQUAL, '??=', $line]
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]);
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$c--;
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continue;
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}
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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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}
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