From 086e8c611664e4b4585d339645137147afcf6227 Mon Sep 17 00:00:00 2001
From: Ivan Goncharov <ivan.goncharov.ua@gmail.com>
Date: Tue, 4 May 2021 20:26:58 +0300
Subject: [PATCH] Forbid non-ASCII characters in JS files

---
 .eslintrc.yml                                 |  3 ++
 benchmark/benchmark.js                        |  2 +-
 resources/eslint-internal-rules/index.js      |  2 +
 resources/eslint-internal-rules/only-ascii.js | 39 +++++++++++++++++++
 resources/eslint-internal-rules/package.json  |  6 ++-
 src/language/__tests__/lexer-test.js          |  6 +--
 6 files changed, 51 insertions(+), 7 deletions(-)
 create mode 100644 resources/eslint-internal-rules/only-ascii.js

diff --git a/.eslintrc.yml b/.eslintrc.yml
index deb7da11d2..f081008804 100644
--- a/.eslintrc.yml
+++ b/.eslintrc.yml
@@ -20,6 +20,7 @@ rules:
   # See './resources/eslint-internal-rules/README.md'
   ##############################################################################
 
+  internal-rules/only-ascii: error
   internal-rules/no-dir-import: error
 
   ##############################################################################
@@ -681,6 +682,7 @@ overrides:
       no-console: off
   - files: 'benchmark/**'
     rules:
+      internal-rules/only-ascii: [error, { allowEmoji: true }]
       node/no-sync: off
       node/no-missing-require: off
       import/no-nodejs-modules: off
@@ -689,6 +691,7 @@ overrides:
       no-await-in-loop: off
   - files: 'resources/**'
     rules:
+      internal-rules/only-ascii: [error, { allowEmoji: true }]
       node/no-unpublished-require: off
       node/no-sync: off
       import/no-extraneous-dependencies: [error, { devDependencies: true }]
diff --git a/benchmark/benchmark.js b/benchmark/benchmark.js
index 8b29c28a26..55125a83fa 100644
--- a/benchmark/benchmark.js
+++ b/benchmark/benchmark.js
@@ -249,7 +249,7 @@ async function runBenchmarks(benchmarks, benchmarkProjects) {
 
       if (i === 0) {
         const { name } = await sampleModule(modulePath);
-        console.log('⏱️   ' + name);
+        console.log('⏱   ' + name);
       }
 
       try {
diff --git a/resources/eslint-internal-rules/index.js b/resources/eslint-internal-rules/index.js
index aaf4e65e74..0aca129d70 100644
--- a/resources/eslint-internal-rules/index.js
+++ b/resources/eslint-internal-rules/index.js
@@ -1,9 +1,11 @@
 'use strict';
 
+const onlyASCII = require('./only-ascii');
 const noDirImport = require('./no-dir-import');
 
 module.exports = {
   rules: {
+    'only-ascii': onlyASCII,
     'no-dir-import': noDirImport,
   },
 };
diff --git a/resources/eslint-internal-rules/only-ascii.js b/resources/eslint-internal-rules/only-ascii.js
new file mode 100644
index 0000000000..f5ddbe1b68
--- /dev/null
+++ b/resources/eslint-internal-rules/only-ascii.js
@@ -0,0 +1,39 @@
+'use strict';
+
+module.exports = {
+  meta: {
+    schema: [
+      {
+        type: 'object',
+        properties: {
+          allowEmoji: {
+            type: 'boolean',
+          },
+        },
+        additionalProperties: false,
+      },
+    ],
+  },
+  create: onlyASCII,
+};
+
+function onlyASCII(context) {
+  const regExp =
+    context.options[0]?.allowEmoji === true
+      ? /[^\p{ASCII}\p{Emoji}]+/gu
+      : /\P{ASCII}+/gu;
+
+  return {
+    Program() {
+      const sourceCode = context.getSourceCode();
+      const text = sourceCode.getText();
+
+      for (const match of text.matchAll(regExp)) {
+        context.report({
+          loc: sourceCode.getLocFromIndex(match.index),
+          message: `Non-ASCII character "${match[0]}" found.`,
+        });
+      }
+    },
+  };
+}
diff --git a/resources/eslint-internal-rules/package.json b/resources/eslint-internal-rules/package.json
index 60cbef8ee9..5912b1453e 100644
--- a/resources/eslint-internal-rules/package.json
+++ b/resources/eslint-internal-rules/package.json
@@ -1,4 +1,8 @@
 {
   "name": "eslint-plugin-graphql-internal",
-  "version": "0.0.0"
+  "version": "0.0.0",
+  "private": true,
+  "engines": {
+    "node": ">= 14.0.0"
+  }
 }
diff --git a/src/language/__tests__/lexer-test.js b/src/language/__tests__/lexer-test.js
index 77ae6b629d..32a82ee97f 100644
--- a/src/language/__tests__/lexer-test.js
+++ b/src/language/__tests__/lexer-test.js
@@ -706,7 +706,7 @@ describe('Lexer', () => {
       message: 'Syntax Error: Invalid number, expected digit but got: "_".',
       locations: [{ line: 1, column: 2 }],
     });
-    expectSyntaxError('1ß').to.deep.equal({
+    expectSyntaxError('1\u00DF').to.deep.equal({
       message: 'Syntax Error: Cannot parse the unexpected character "\\u00DF".',
       locations: [{ line: 1, column: 2 }],
     });
@@ -718,10 +718,6 @@ describe('Lexer', () => {
       message: 'Syntax Error: Invalid number, expected digit but got: "_".',
       locations: [{ line: 1, column: 6 }],
     });
-    expectSyntaxError('1ß').to.deep.equal({
-      message: 'Syntax Error: Cannot parse the unexpected character "\\u00DF".',
-      locations: [{ line: 1, column: 2 }],
-    });
   });
 
   it('lexes punctuation', () => {