deps: add acorn stage-3 plugins

This adds bigint, class-fields, numeric-separators, static-class
features, private class methods and fields as dependency. That way
it's possible to use these in combination with acorn to parse these
language features.

This also removes a couple of files that were not necessary for
Node.js to reduce the code base.

PR-URL: https://github.com/nodejs/node/pull/27400
Refs: https://github.com/nodejs/node/issues/27391
Refs: https://github.com/nodejs/node/issues/25835
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Michaël Zasso <targos@protonmail.com>

5 files changed, 195 insertions, 0 deletions

diff --git a/deps/acorn-plugins/acorn-class-fields/CHANGELOG.md b/deps/acorn-plugins/acorn-class-fields/CHANGELOG.md
new file mode 100644
index 0000000000..de2c66b0c3
--- /dev/null
+++ b/deps/acorn-plugins/acorn-class-fields/CHANGELOG.md
@@ -0,0 +1,28 @@
+## 0.3.1 (2019-02-09)
+
+* Restore compatibility with acorn-private-methods
+
+## 0.3.0 (2019-02-09)
+
+* Require acorn >= 6.1.0
+
+## 0.2.1 (2018-11-06)
+
+* Adapt to changes in acorn 6.0.3
+
+## 0.2.0 (2018-09-14)
+
+* Update to new acorn 6 interface
+* Change license to MIT
+
+## 0.1.2 (2018-01-26)
+
+* Don't accept whitespace between hash and private name
+
+## 0.1.1 (2018-01-17)
+
+* Correctly parse all fields named `async`
+
+## 0.1.0 (2018-01-13)
+
+Initial release
diff --git a/deps/acorn-plugins/acorn-class-fields/LICENSE b/deps/acorn-plugins/acorn-class-fields/LICENSE
new file mode 100644
index 0000000000..7c2b27a19c
--- /dev/null
+++ b/deps/acorn-plugins/acorn-class-fields/LICENSE
@@ -0,0 +1,19 @@
+Copyright (C) 2017-2018 by Adrian Heine
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
diff --git a/deps/acorn-plugins/acorn-class-fields/README.md b/deps/acorn-plugins/acorn-class-fields/README.md
new file mode 100644
index 0000000000..60f3463e94
--- /dev/null
+++ b/deps/acorn-plugins/acorn-class-fields/README.md
@@ -0,0 +1,21 @@
+# Class fields support for Acorn
+
+[![NPM version](https://img.shields.io/npm/v/acorn-class-fields.svg)](https://www.npmjs.org/package/acorn-class-fields)
+
+This is a plugin for [Acorn](http://marijnhaverbeke.nl/acorn/) - a tiny, fast JavaScript parser, written completely in JavaScript.
+
+It implements support for class fields as defined in the stage 3 proposal [Class field declarations for JavaScript](https://github.com/tc39/proposal-class-fields). The emitted AST follows [an ESTree proposal](https://github.com/estree/estree/pull/180).
+
+## Usage
+
+This module provides a plugin that can be used to extend the Acorn `Parser` class:
+
+```javascript
+const {Parser} = require('acorn');
+const classFields = require('acorn-class-fields');
+Parser.extend(classFields).parse('class X { x = 0 }');
+```
+
+## License
+
+This plugin is released under an [MIT License](./LICENSE).
diff --git a/deps/acorn-plugins/acorn-class-fields/index.js b/deps/acorn-plugins/acorn-class-fields/index.js
new file mode 100644
index 0000000000..20348c80c6
--- /dev/null
+++ b/deps/acorn-plugins/acorn-class-fields/index.js
@@ -0,0 +1,59 @@
+"use strict"
+
+const acorn = require('internal/deps/acorn/acorn/dist/acorn')
+const tt = acorn.tokTypes
+const privateClassElements = require('internal/deps/acorn-plugins/acorn-private-class-elements/index')
+
+function maybeParseFieldValue(field) {
+  if (this.eat(tt.eq)) {
+    const oldInFieldValue = this._inFieldValue
+    this._inFieldValue = true
+    field.value = this.parseExpression()
+    this._inFieldValue = oldInFieldValue
+  } else field.value = null
+}
+
+module.exports = function(Parser) {
+  Parser = privateClassElements(Parser)
+  return class extends Parser {
+    // Parse fields
+    parseClassElement(_constructorAllowsSuper) {
+      if (this.options.ecmaVersion >= 8 && (this.type == tt.name || this.type == this.privateNameToken || this.type == tt.bracketL || this.type == tt.string)) {
+        const branch = this._branch()
+        if (branch.type == tt.bracketL) {
+          let count = 0
+          do {
+            if (branch.eat(tt.bracketL)) ++count
+            else if (branch.eat(tt.bracketR)) --count
+            else branch.next()
+          } while (count > 0)
+        } else branch.next()
+        if (branch.type == tt.eq || branch.canInsertSemicolon() || branch.type == tt.semi) {
+          const node = this.startNode()
+          if (this.type == this.privateNameToken) {
+            this.parsePrivateClassElementName(node)
+          } else {
+            this.parsePropertyName(node)
+          }
+          if ((node.key.type === "Identifier" && node.key.name === "constructor") ||
+              (node.key.type === "Literal" && node.key.value === "constructor")) {
+            this.raise(node.key.start, "Classes may not have a field called constructor")
+          }
+          maybeParseFieldValue.call(this, node)
+          this.finishNode(node, "FieldDefinition")
+          this.semicolon()
+          return node
+        }
+      }
+
+      return super.parseClassElement.apply(this, arguments)
+    }
+
+    // Prohibit arguments in class field initializers
+    parseIdent(liberal, isBinding) {
+      const ident = super.parseIdent(liberal, isBinding)
+      if (this._inFieldValue && ident.name == "arguments") this.raise(ident.start, "A class field initializer may not contain arguments")
+      return ident
+    }
+  }
+}
diff --git a/deps/acorn-plugins/acorn-class-fields/package.json b/deps/acorn-plugins/acorn-class-fields/package.json
new file mode 100644
index 0000000000..4df166ba19
--- /dev/null
+++ b/deps/acorn-plugins/acorn-class-fields/package.json
@@ -0,0 +1,68 @@
+{
+  "_from": "acorn-class-fields",
+  "_id": "acorn-class-fields@0.3.1",
+  "_inBundle": false,
+  "_integrity": "sha512-X/8hSJuregAnrvfV1Y80VJNfeJx1uhw7yskOwvL631ygYeCGVLPumCnnPDHYZ8acV3ytHhg53K171H3tAemgiw==",
+  "_location": "/acorn-class-fields",
+  "_phantomChildren": {},
+  "_requested": {
+    "type": "tag",
+    "registry": true,
+    "raw": "acorn-class-fields",
+    "name": "acorn-class-fields",
+    "escapedName": "acorn-class-fields",
+    "rawSpec": "",
+    "saveSpec": null,
+    "fetchSpec": "latest"
+  },
+  "_requiredBy": [
+    "#USER",
+    "/"
+  ],
+  "_resolved": "https://registry.npmjs.org/acorn-class-fields/-/acorn-class-fields-0.3.1.tgz",
+  "_shasum": "032ce47a9688a71d4713ee366fadcb7fefaea9e0",
+  "_spec": "acorn-class-fields",
+  "_where": "/home/ruben/repos/node/node",
+  "bugs": {
+    "url": "https://github.com/acornjs/acorn-class-fields/issues"
+  },
+  "bundleDependencies": false,
+  "contributors": [
+    {
+      "name": "Adrian Heine",
+      "email": "mail@adrianheine.de"
+    }
+  ],
+  "dependencies": {
+    "acorn-private-class-elements": "^0.1.1"
+  },
+  "deprecated": false,
+  "description": "Support for class fields in acorn",
+  "devDependencies": {
+    "acorn": "^6.1.0",
+    "eslint": "^5.13.0",
+    "eslint-plugin-node": "^8.0.1",
+    "mocha": "^5.2.0",
+    "test262": "git+https://github.com/tc39/test262.git#33a306d1026b72227eb50a918db19ada16f12b3d",
+    "test262-parser-runner": "^0.5.0"
+  },
+  "engines": {
+    "node": ">=4.8.2"
+  },
+  "homepage": "https://github.com/acornjs/acorn-class-fields",
+  "license": "MIT",
+  "name": "acorn-class-fields",
+  "peerDependencies": {
+    "acorn": "^6.0.0"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/acornjs/acorn-class-fields.git"
+  },
+  "scripts": {
+    "lint": "eslint -c .eslintrc.json .",
+    "test": "mocha",
+    "test:test262": "node run_test262.js"
+  },
+  "version": "0.3.1"
+}