Initial commit

node_modules/dir-compare/build/src/symlink/loopDetector.js

@@ -0,0 +1,46 @@
+const fs = require('fs');
+/**
+ * Provides symlink loop detection to directory traversal algorithm.
+ */
+module.exports = {
+    detectLoop(entry, symlinkCache) {
+        if (entry && entry.isSymlink) {
+            const realPath = fs.realpathSync(entry.absolutePath);
+            if (symlinkCache[realPath]) {
+                return true;
+            }
+        }
+        return false;
+    },
+    initSymlinkCache() {
+        return {
+            dir1: {},
+            dir2: {}
+        };
+    },
+    updateSymlinkCache(symlinkCache, rootEntry1, rootEntry2, loopDetected1, loopDetected2) {
+        let symlinkCachePath1, symlinkCachePath2;
+        if (rootEntry1 && !loopDetected1) {
+            symlinkCachePath1 = rootEntry1.isSymlink ? fs.realpathSync(rootEntry1.absolutePath) : rootEntry1.absolutePath;
+            symlinkCache.dir1[symlinkCachePath1] = true;
+        }
+        if (rootEntry2 && !loopDetected2) {
+            symlinkCachePath2 = rootEntry2.isSymlink ? fs.realpathSync(rootEntry2.absolutePath) : rootEntry2.absolutePath;
+            symlinkCache.dir2[symlinkCachePath2] = true;
+        }
+    },
+    cloneSymlinkCache(symlinkCache) {
+        return {
+            dir1: shallowClone(symlinkCache.dir1),
+            dir2: shallowClone(symlinkCache.dir2)
+        };
+    },
+};
+function shallowClone(obj) {
+    const cloned = {};
+    Object.keys(obj).forEach(key => {
+        cloned[key] = obj[key];
+    });
+    return cloned;
+}
+//# sourceMappingURL=loopDetector.js.map