1 files changed, 62 insertions, 0 deletions
diff --git a/vendor/nikic/php-parser/lib/PhpParser/Lexer/TokenEmulator/KeywordEmulator.php b/vendor/nikic/php-parser/lib/PhpParser/Lexer/TokenEmulator/KeywordEmulator.php
new file mode 100644
index 000000000..ea261cc17
--- /dev/null
+++ b/vendor/nikic/php-parser/lib/PhpParser/Lexer/TokenEmulator/KeywordEmulator.php
@@ -0,0 +1,62 @@
+<?php declare(strict_types=1);
+
+namespace PhpParser\Lexer\TokenEmulator;
+
+abstract class KeywordEmulator extends TokenEmulator
+{
+    abstract function getKeywordString(): string;
+    abstract function getKeywordToken(): int;
+
+    public function isEmulationNeeded(string $code): bool
+    {
+        return strpos(strtolower($code), $this->getKeywordString()) !== false;
+    }
+
+    protected function isKeywordContext(array $tokens, int $pos): bool
+    {
+        $previousNonSpaceToken = $this->getPreviousNonSpaceToken($tokens, $pos);
+        return $previousNonSpaceToken === null || $previousNonSpaceToken[0] !== \T_OBJECT_OPERATOR;
+    }
+
+    public function emulate(string $code, array $tokens): array
+    {
+        $keywordString = $this->getKeywordString();
+        foreach ($tokens as $i => $token) {
+            if ($token[0] === T_STRING && strtolower($token[1]) === $keywordString
+                    && $this->isKeywordContext($tokens, $i)) {
+                $tokens[$i][0] = $this->getKeywordToken();
+            }
+        }
+
+        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;
+    }
+
+    public function reverseEmulate(string $code, array $tokens): array
+    {
+        $keywordToken = $this->getKeywordToken();
+        foreach ($tokens as $i => $token) {
+            if ($token[0] === $keywordToken) {
+                $tokens[$i][0] = \T_STRING;
+            }
+        }
+
+        return $tokens;
+    }
+}