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, 47 insertions, 0 deletions

diff --git a/tools/node_modules/eslint/lib/rules/no-octal-escape.js b/tools/node_modules/eslint/lib/rules/no-octal-escape.js
new file mode 100644
index 0000000000..04bfb6aae3
--- /dev/null
+++ b/tools/node_modules/eslint/lib/rules/no-octal-escape.js
@@ -0,0 +1,47 @@
+/**
+ * @fileoverview Rule to flag octal escape sequences in string literals.
+ * @author Ian Christian Myers
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        docs: {
+            description: "disallow octal escape sequences in string literals",
+            category: "Best Practices",
+            recommended: false
+        },
+
+        schema: []
+    },
+
+    create(context) {
+
+        return {
+
+            Literal(node) {
+                if (typeof node.value !== "string") {
+                    return;
+                }
+
+                const match = node.raw.match(/^([^\\]|\\[^0-7])*\\([0-3][0-7]{1,2}|[4-7][0-7]|[0-7])/);
+
+                if (match) {
+                    const octalDigit = match[2];
+
+                    // \0 is actually not considered an octal
+                    if (match[2] !== "0" || typeof match[3] !== "undefined") {
+                        context.report({ node, message: "Don't use octal: '\\{{octalDigit}}'. Use '\\u....' instead.", data: { octalDigit } });
+                    }
+                }
+            }
+
+        };
+
+    }
+};