tools: move eslint from tools to tools/node_modules

This is required because we need to add the babel-eslint dependency
and it has to be able to resolve "eslint".
babel-eslint is required to support future ES features such as async
iterators and import.meta.

Refs: https://github.com/nodejs/node/pull/17755
PR-URL: https://github.com/nodejs/node/pull/17820
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>

1 files changed, 46 insertions, 0 deletions

diff --git a/tools/node_modules/eslint/node_modules/remark-parse/lib/unescape.js b/tools/node_modules/eslint/node_modules/remark-parse/lib/unescape.js
new file mode 100644
index 0000000000..dc83486126
--- /dev/null
+++ b/tools/node_modules/eslint/node_modules/remark-parse/lib/unescape.js
@@ -0,0 +1,46 @@
+/**
+ * @author Titus Wormer
+ * @copyright 2015 Titus Wormer
+ * @license MIT
+ * @module remark:parse:unescape
+ * @fileoverview Unescape escapes.
+ */
+
+'use strict';
+
+/* Expose. */
+module.exports = factory;
+
+/* Factory to de-escape a value, based on a list at `key`
+ * in `ctx`. */
+function factory(ctx, key) {
+  return unescape;
+
+  /* De-escape a string using the expression at `key`
+   * in `ctx`. */
+  function unescape(value) {
+    var prev = 0;
+    var index = value.indexOf('\\');
+    var escape = ctx[key];
+    var queue = [];
+    var character;
+
+    while (index !== -1) {
+      queue.push(value.slice(prev, index));
+      prev = index + 1;
+      character = value.charAt(prev);
+
+      /* If the following character is not a valid escape,
+       * add the slash. */
+      if (!character || escape.indexOf(character) === -1) {
+        queue.push('\\');
+      }
+
+      index = value.indexOf('\\', prev);
+    }
+
+    queue.push(value.slice(prev));
+
+    return queue.join('');
+  }
+}