From 5e124e7561b355758a68f79d3ecf10148f8ecdd5 Mon Sep 17 00:00:00 2001
From: Shin'ya Ueoka <ueokande@i-beam.org>
Date: Tue, 5 Sep 2017 12:07:02 +0900
Subject: add Completion class

---
 src/console/completion.js | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)
 create mode 100644 src/console/completion.js

(limited to 'src')

diff --git a/src/console/completion.js b/src/console/completion.js
new file mode 100644
index 0000000..0c21cb0
--- /dev/null
+++ b/src/console/completion.js
@@ -0,0 +1,26 @@
+export default class Completion {
+  constructor(completions) {
+    if (typeof completions.length !== 'number') {
+      throw new TypeError('completions does not have a length in number');
+    }
+    this.completions = completions
+    this.index = 0;
+  }
+
+  prev() {
+    if (this.completions.length === 0) {
+      return null;
+    }
+    this.index = (this.index + this.completions.length - 1) % this.completions.length
+    return this.completions[this.index];
+  }
+
+  next() {
+    if (this.completions.length === 0) {
+      return null;
+    }
+    let item = this.completions[this.index];
+    this.index = (this.index + 1) % this.completions.length
+    return item;
+  }
+}
-- 
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