1 files changed, 47 insertions, 0 deletions
diff --git a/vendor/nikic/php-parser/lib/PhpParser/Lexer/TokenEmulator/CoaleseEqualTokenEmulator.php b/vendor/nikic/php-parser/lib/PhpParser/Lexer/TokenEmulator/CoaleseEqualTokenEmulator.php
new file mode 100644
index 000000000..d91da9214
--- /dev/null
+++ b/vendor/nikic/php-parser/lib/PhpParser/Lexer/TokenEmulator/CoaleseEqualTokenEmulator.php
@@ -0,0 +1,47 @@
+<?php declare(strict_types=1);
+
+namespace PhpParser\Lexer\TokenEmulator;
+
+use PhpParser\Lexer\Emulative;
+
+final class CoaleseEqualTokenEmulator extends TokenEmulator
+{
+    public function getPhpVersion(): string
+    {
+        return Emulative::PHP_7_4;
+    }
+
+    public function isEmulationNeeded(string $code): bool
+    {
+        return strpos($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, [
+                        [\T_COALESCE_EQUAL, '??=', $line]
+                    ]);
+                    $c--;
+                    continue;
+                }
+            }
+            if (\is_array($tokens[$i])) {
+                $line += substr_count($tokens[$i][1], "\n");
+            }
+        }
+
+        return $tokens;
+    }
+
+    public function reverseEmulate(string $code, array $tokens): array
+    {
+        // ??= was not valid code previously, don't bother.
+        return $tokens;
+    }
+}