1 files changed, 67 insertions, 0 deletions
diff --git a/vendor/nikic/php-parser/lib/PhpParser/Lexer/TokenEmulator/NullsafeTokenEmulator.php b/vendor/nikic/php-parser/lib/PhpParser/Lexer/TokenEmulator/NullsafeTokenEmulator.php
new file mode 100644
index 000000000..1a29c676e
--- /dev/null
+++ b/vendor/nikic/php-parser/lib/PhpParser/Lexer/TokenEmulator/NullsafeTokenEmulator.php
@@ -0,0 +1,67 @@
+<?php declare(strict_types=1);
+
+namespace PhpParser\Lexer\TokenEmulator;
+
+use PhpParser\Lexer\Emulative;
+
+final class NullsafeTokenEmulator extends TokenEmulator
+{
+    public function getPhpVersion(): string
+    {
+        return Emulative::PHP_8_0;
+    }
+
+    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 ($tokens[$i] === '?' && isset($tokens[$i + 1]) && $tokens[$i + 1][0] === \T_OBJECT_OPERATOR) {
+                array_splice($tokens, $i, 2, [
+                    [\T_NULLSAFE_OBJECT_OPERATOR, '?->', $line]
+                ]);
+                $c--;
+                continue;
+            }
+
+            // Handle ?-> inside encapsed string.
+            if ($tokens[$i][0] === \T_ENCAPSED_AND_WHITESPACE && isset($tokens[$i - 1])
+                && $tokens[$i - 1][0] === \T_VARIABLE
+                && preg_match('/^\?->([a-zA-Z_\x80-\xff][a-zA-Z0-9_\x80-\xff]*)/', $tokens[$i][1], $matches)
+            ) {
+                $replacement = [
+                    [\T_NULLSAFE_OBJECT_OPERATOR, '?->', $line],
+                    [\T_STRING, $matches[1], $line],
+                ];
+                if (\strlen($matches[0]) !== \strlen($tokens[$i][1])) {
+                    $replacement[] = [
+                        \T_ENCAPSED_AND_WHITESPACE,
+                        \substr($tokens[$i][1], \strlen($matches[0])),
+                        $line
+                    ];
+                }
+                array_splice($tokens, $i, 1, $replacement);
+                $c += \count($replacement) - 1;
+                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;
+    }
+}