From 363723fc84f7b8477592e0105aeb331ec9a017af Mon Sep 17 00:00:00 2001
From: Florian Dold <florian.dold@gmail.com>
Date: Mon, 14 Aug 2017 05:01:11 +0200
Subject: node_modules

---
 node_modules/concordance/lib/Circular.js | 35 ++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)
 create mode 100644 node_modules/concordance/lib/Circular.js

(limited to 'node_modules/concordance/lib/Circular.js')

diff --git a/node_modules/concordance/lib/Circular.js b/node_modules/concordance/lib/Circular.js
new file mode 100644
index 000000000..c5c020267
--- /dev/null
+++ b/node_modules/concordance/lib/Circular.js
@@ -0,0 +1,35 @@
+'use strict'
+
+class Circular {
+  constructor () {
+    this.stack = new Map()
+  }
+
+  add (descriptor) {
+    if (this.stack.has(descriptor)) throw new Error('Already in stack')
+
+    if (descriptor.isItem !== true && descriptor.isMapEntry !== true && descriptor.isProperty !== true) {
+      this.stack.set(descriptor, this.stack.size + 1)
+    }
+    return this
+  }
+
+  delete (descriptor) {
+    if (this.stack.has(descriptor)) {
+      if (this.stack.get(descriptor) !== this.stack.size) throw new Error('Not on top of stack')
+      this.stack.delete(descriptor)
+    }
+    return this
+  }
+
+  has (descriptor) {
+    return this.stack.has(descriptor)
+  }
+
+  get (descriptor) {
+    return this.stack.has(descriptor)
+      ? this.stack.get(descriptor)
+      : 0
+  }
+}
+module.exports = Circular
-- 
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