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vendor/nikic/php-parser/lib/PhpParser/Lexer/TokenEmulator/CoaleseEqualTokenEmulator.php

@@ -0,0 +1,41 @@
+<?php declare(strict_types=1);
+
+namespace PhpParser\Lexer\TokenEmulator;
+
+use PhpParser\Lexer\Emulative;
+
+final class CoaleseEqualTokenEmulator implements TokenEmulatorInterface
+{
+    public function isEmulationNeeded(string $code) : bool
+    {
+        // skip version where this is supported
+        if (version_compare(\PHP_VERSION, Emulative::PHP_7_4, '>=')) {
+            return false;
+        }
+
+        return strpos($code, '??=') !== false;
+    }
+
+    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
+        $line = 1;
+        for ($i = 0, $c = count($tokens); $i < $c; ++$i) {
+            if (isset($tokens[$i + 1])) {
+                if ($tokens[$i][0] === T_COALESCE && $tokens[$i + 1] === '=') {
+                    array_splice($tokens, $i, 2, [
+                        [Emulative::T_COALESCE_EQUAL, '??=', $line]
+                    ]);
+                    $c--;
+                    continue;
+                }
+            }
+            if (\is_array($tokens[$i])) {
+                $line += substr_count($tokens[$i][1], "\n");
+            }
+        }
+
+        return $tokens;
+    }
+}

vendor/nikic/php-parser/lib/PhpParser/Lexer/TokenEmulator/FnTokenEmulator.php

@@ -0,0 +1,53 @@
+<?php declare(strict_types=1);
+
+namespace PhpParser\Lexer\TokenEmulator;
+
+use PhpParser\Lexer\Emulative;
+
+final class FnTokenEmulator implements TokenEmulatorInterface
+{
+    public function isEmulationNeeded(string $code) : bool
+    {
+        // skip version where this is supported
+        if (version_compare(\PHP_VERSION, Emulative::PHP_7_4, '>=')) {
+            return false;
+        }
+
+        return strpos($code, 'fn') !== false;
+    }
+
+    public function emulate(string $code, array $tokens): array
+    {
+        // We need to manually iterate and manage a count because we'll change
+        // the tokens array on the way
+        foreach ($tokens as $i => $token) {
+            if ($token[0] === T_STRING && $token[1] === 'fn') {
+                $previousNonSpaceToken = $this->getPreviousNonSpaceToken($tokens, $i);
+                if ($previousNonSpaceToken !== null && $previousNonSpaceToken[0] === T_OBJECT_OPERATOR) {
+                    continue;
+                }
+
+                $tokens[$i][0] = Emulative::T_FN;
+            }
+        }
+
+        return $tokens;
+    }
+
+    /**
+     * @param mixed[] $tokens
+     * @return mixed[]|null
+     */
+    private function getPreviousNonSpaceToken(array $tokens, int $start)
+    {
+        for ($i = $start - 1; $i >= 0; --$i) {
+            if ($tokens[$i][0] === T_WHITESPACE) {
+                continue;
+            }
+
+            return $tokens[$i];
+        }
+
+        return null;
+    }
+}

vendor/nikic/php-parser/lib/PhpParser/Lexer/TokenEmulator/NumericLiteralSeparatorEmulator.php

@@ -0,0 +1,99 @@
+<?php declare(strict_types=1);
+
+namespace PhpParser\Lexer\TokenEmulator;
+
+use PhpParser\Lexer\Emulative;
+
+final class NumericLiteralSeparatorEmulator implements TokenEmulatorInterface
+{
+    const BIN = '(?:0b[01]+(?:_[01]+)*)';
+    const HEX = '(?:0x[0-9a-f]+(?:_[0-9a-f]+)*)';
+    const DEC = '(?:[0-9]+(?:_[0-9]+)*)';
+    const SIMPLE_FLOAT = '(?:' . self::DEC . '\.' . self::DEC . '?|\.' . self::DEC . ')';
+    const EXP = '(?:e[+-]?' . self::DEC . ')';
+    const FLOAT = '(?:' . self::SIMPLE_FLOAT . self::EXP . '?|' . self::DEC . self::EXP . ')';
+    const NUMBER = '~' . self::FLOAT . '|' . self::BIN . '|' . self::HEX . '|' . self::DEC . '~iA';
+
+    public function isEmulationNeeded(string $code) : bool
+    {
+        // skip version where this is supported
+        if (version_compare(\PHP_VERSION, Emulative::PHP_7_4, '>=')) {
+            return false;
+        }
+
+        return preg_match('~[0-9]_[0-9]~', $code)
+            || preg_match('~0x[0-9a-f]+_[0-9a-f]~i', $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
+        $codeOffset = 0;
+        for ($i = 0, $c = count($tokens); $i < $c; ++$i) {
+            $token = $tokens[$i];
+            $tokenLen = \strlen(\is_array($token) ? $token[1] : $token);
+
+            if ($token[0] !== T_LNUMBER && $token[0] !== T_DNUMBER) {
+                $codeOffset += $tokenLen;
+                continue;
+            }
+
+            $res = preg_match(self::NUMBER, $code, $matches, 0, $codeOffset);
+            assert($res, "No number at number token position");
+
+            $match = $matches[0];
+            $matchLen = \strlen($match);
+            if ($matchLen === $tokenLen) {
+                // Original token already holds the full number.
+                $codeOffset += $tokenLen;
+                continue;
+            }
+
+            $tokenKind = $this->resolveIntegerOrFloatToken($match);
+            $newTokens = [[$tokenKind, $match, $token[2]]];
+
+            $numTokens = 1;
+            $len = $tokenLen;
+            while ($matchLen > $len) {
+                $nextToken = $tokens[$i + $numTokens];
+                $nextTokenText = \is_array($nextToken) ? $nextToken[1] : $nextToken;
+                $nextTokenLen = \strlen($nextTokenText);
+
+                $numTokens++;
+                if ($matchLen < $len + $nextTokenLen) {
+                    // Split trailing characters into a partial token.
+                    assert(is_array($nextToken), "Partial token should be an array token");
+                    $partialText = substr($nextTokenText, $matchLen - $len);
+                    $newTokens[] = [$nextToken[0], $partialText, $nextToken[2]];
+                    break;
+                }
+
+                $len += $nextTokenLen;
+            }
+
+            array_splice($tokens, $i, $numTokens, $newTokens);
+            $c -= $numTokens - \count($newTokens);
+            $codeOffset += $matchLen;
+        }
+
+        return $tokens;
+    }
+
+    private function resolveIntegerOrFloatToken(string $str): int
+    {
+        $str = str_replace('_', '', $str);
+
+        if (stripos($str, '0b') === 0) {
+            $num = bindec($str);
+        } elseif (stripos($str, '0x') === 0) {
+            $num = hexdec($str);
+        } elseif (stripos($str, '0') === 0 && ctype_digit($str)) {
+            $num = octdec($str);
+        } else {
+            $num = +$str;
+        }
+
+        return is_float($num) ? T_DNUMBER : T_LNUMBER;
+    }
+}

vendor/nikic/php-parser/lib/PhpParser/Lexer/TokenEmulator/TokenEmulatorInterface.php

@@ -0,0 +1,14 @@
+<?php declare(strict_types=1);
+
+namespace PhpParser\Lexer\TokenEmulator;
+
+/** @internal */
+interface TokenEmulatorInterface
+{
+    public function isEmulationNeeded(string $code): bool;
+
+    /**
+     * @return array Modified Tokens
+     */
+    public function emulate(string $code, array $tokens): array;
+}