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, 74 insertions, 0 deletions

diff --git a/tools/node_modules/eslint/node_modules/remark-parse/lib/tokenize/yaml.js b/tools/node_modules/eslint/node_modules/remark-parse/lib/tokenize/yaml.js
new file mode 100644
index 0000000000..78dec31a0f
--- /dev/null
+++ b/tools/node_modules/eslint/node_modules/remark-parse/lib/tokenize/yaml.js
@@ -0,0 +1,74 @@
+/**
+ * @author Titus Wormer
+ * @copyright 2015 Titus Wormer
+ * @license MIT
+ * @module remark:parse:tokenize:yaml
+ * @fileoverview Tokenise YAML.
+ */
+
+'use strict';
+
+module.exports = yaml;
+yaml.onlyAtStart = true;
+
+var FENCE = '---';
+var C_DASH = '-';
+var C_NEWLINE = '\n';
+
+/* Tokenise YAML. */
+function yaml(eat, value, silent) {
+  var self = this;
+  var subvalue;
+  var content;
+  var index;
+  var length;
+  var character;
+  var queue;
+
+  if (
+    !self.options.yaml ||
+    value.charAt(0) !== C_DASH ||
+    value.charAt(1) !== C_DASH ||
+    value.charAt(2) !== C_DASH ||
+    value.charAt(3) !== C_NEWLINE
+  ) {
+    return;
+  }
+
+  subvalue = FENCE + C_NEWLINE;
+  content = '';
+  queue = '';
+  index = 3;
+  length = value.length;
+
+  while (++index < length) {
+    character = value.charAt(index);
+
+    if (
+      character === C_DASH &&
+      (queue || !content) &&
+      value.charAt(index + 1) === C_DASH &&
+      value.charAt(index + 2) === C_DASH
+    ) {
+      /* istanbul ignore if - never used (yet) */
+      if (silent) {
+        return true;
+      }
+
+      subvalue += queue + FENCE;
+
+      return eat(subvalue)({
+        type: 'yaml',
+        value: content
+      });
+    }
+
+    if (character === C_NEWLINE) {
+      queue += character;
+    } else {
+      subvalue += queue + character;
+      content += queue + character;
+      queue = '';
+    }
+  }
+}