tools: update ESLint to version 2.1.0

Update ESLint to 2.1.0. ESLint has a number of potentially-useful new
features but this change attempts to be minimal in its changes.
However, some things could not be avoided reasonably.

ESLint 2.1.0 found a few lint issues that ESLing 1.x missed with
template strings that did not take advantage of any features of
template strings, and `let` declarations where `const` sufficed.

Additionally, ESLint 2.1.0 removes some granularity around enabling ES6
features. Some features (e.g., spread operator) that had been turned off
in our configuration for ESLint 1.x are now permitted.

PR-URL: https://github.com/nodejs/node/pull/5214
Reviewed-By: Michaël Zasso <mic.besace@gmail.com>
Reviewed-By: jbergstroem - Johan Bergström <bugs@bergstroem.nu>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Roman Reiss <me@silverwind.io>
Reviewed-By: Myles Borins <myles.borins@gmail.com>

1 files changed, 43 insertions, 0 deletions

diff --git a/tools/eslint/lib/code-path-analysis/id-generator.js b/tools/eslint/lib/code-path-analysis/id-generator.js
new file mode 100644
index 0000000000..c37e7d7e5b
--- /dev/null
+++ b/tools/eslint/lib/code-path-analysis/id-generator.js
@@ -0,0 +1,43 @@
+/**
+ * @fileoverview A class of identifiers generator for code path segments.
+ *
+ * Each rule uses the identifier of code path segments to store additional
+ * information of the code path.
+ *
+ * @author Toru Nagashima
+ * @copyright 2015 Toru Nagashima. All rights reserved.
+ * See LICENSE file in root directory for full license.
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+/**
+ * A generator for unique ids.
+ *
+ * @constructor
+ * @param {string} prefix - Optional. A prefix of generated ids.
+ */
+function IdGenerator(prefix) {
+    this.prefix = String(prefix);
+    this.n = 0;
+}
+
+/**
+ * Generates id.
+ *
+ * @returns {string} A generated id.
+ */
+IdGenerator.prototype.next = function() {
+    this.n = 1 + this.n | 0;
+    /* istanbul ignore if */
+    if (this.n < 0) {
+        this.n = 1;
+    }
+    return this.prefix + this.n;
+};
+
+module.exports = IdGenerator;