feat(lexer): added lexer souce code

.editorconfig

@@ -0,0 +1,14 @@
+# http://EditorConfig.org
+
+root = true
+
+[*]
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+indent_style = space
+indent_size = 2
+
+[ts]
+indent_size = 2

.gitignore

@@ -0,0 +1,24 @@
+/dist
+node_modules
+/coverage
+/.nyc_output
+/.rpt2_cache
+/packages/*/node_modules
+/packages/*/npm-debug.log
+/packages/*/build
+/packages/*/lib
+/packages/*/coverage
+/packages/*/.nyc_output
+/packages/*/.rpt2_cache
+yarn.lock
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+.rollupcache
+.fuzz-output
+.DS_Store
+cherow-rewritten.js
+
+# fuzz output
+/packages/cherow/.fuzz-output/

.npmrc

@@ -0,0 +1 @@
+package-lock = true

.prettierignore

@@ -0,0 +1,11 @@
+bench/v1.6.2/
+bench/v2/
+bench/v8-native-calls.js
+node_modules/
+dist/
+src/token.ts
+src/common.ts
+src/chars.ts
+src/lexer/charClassifier.ts
+src/unicode.ts
+package-lock.json

.vscode/extensions.json

@@ -0,0 +1,9 @@
+{
+  "recommendations": [
+    "christian-kohler.path-intellisense",
+    "EditorConfig.EditorConfig",
+    "esbenp.prettier-vscode",
+    "joelday.docthis",
+    "steoates.autoimport"
+  ]
+}

.vscode/launch.json

@@ -0,0 +1,47 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "type": "node",
+            "request": "launch",
+            "name": "Launch Program",
+            "program": "${workspaceFolder}\\dist\\umd\\cherow.js",
+            "preLaunchTask": "tsc: build - tsconfig.json",
+            "outFiles": [
+                "${workspaceFolder}/build/**/*.js"
+            ]
+        },
+        {
+          "type": "node",
+          "request": "launch",
+          "name": "Launch mocha tests",
+          "program": "${workspaceRoot}/node_modules/mocha/bin/_mocha",
+          "env": {
+            "TS_NODE_PROJECT": "${workspaceRoot}/test/tsconfig.json"
+          },
+          "args": [
+            "${workspaceRoot}/test/**/*.ts",
+            "-c",
+            "-R",
+            "progress",
+            "-r",
+            "source-map-support/register",
+            "-r",
+            "ts-node/register",
+            "--recursive",
+            "--globals",
+            "expect",
+            "--timeout",
+            "999999",
+            "--watch",
+            "--watch-extensions",
+            "ts"
+          ],
+          "cwd": "${workspaceRoot}",
+          "internalConsoleOptions": "openOnSessionStart"
+        }
+    ]
+}

.vscode/settings.json

@@ -0,0 +1,18 @@
+{
+    "typescript.tsdk": "./node_modules/typescript/lib",
+    "tslint.nodePath": "./node_modules/tslint/bin/tslint",
+    "tslint.exclude": [
+      "**/node_modules/**",
+      "**/dist/**",
+      "**/build/**",
+      "packages/*/test/**"
+    ],
+    "emmet.triggerExpansionOnTab": true,
+    "search.exclude": {
+      "**/node_modules": true,
+      "**/dist": true,
+      "**/build": true,
+      "**/.vscode": true
+    },
+    "prettier.singleQuote": true
+  }

LICENSE.md

@@ -0,0 +1,7 @@
+ISC License
+
+Copyright (c) 2019 and later, KFlash and others.
+
+Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

package.json

@@ -0,0 +1,96 @@
+{
+  "name": "meriyah",
+  "version": "0.1.0",
+  "description": "Fast and lightweight, standard-compliant javascript parser written in ECMAScript",
+  "main": "dist/meriyah.umd.js",
+  "module": "dist/meriyah.esm.js",
+  "jsnext:main": "dist/meriyah.esm.js",
+  "browser": "dist/meriyah.umd.js",
+  "types": "dist/meriyah.d.ts",
+  "typings": "dist/meriyah.d.ts",
+  "author": "KFlash",
+  "license": "ISC",
+  "homepage": "https://github.com/meriyah/meriyah",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/meriyah/meriyah"
+  },
+  "bugs": {
+    "url": "https://github.com/meriyah/meriyah/issues"
+  },
+  "keywords": [
+    "parsing",
+    "ecmascript",
+    "typescript",
+    "javascript",
+    "lexer",
+    "scanner",
+    "parser",
+    "performance",
+    "estree",
+    "es2018",
+    "es2019",
+    "es2020",
+    "esnext",
+    "ast",
+    "lightweight"
+  ],
+  "files": [
+    "dist",
+    "src",
+    "README.md",
+    "CHANGELOG.md",
+    "LICENSE.md"
+  ],
+  "publishConfig": {
+    "access": "public"
+  },
+  "scripts": {
+    "build": "tsc",
+    "build:watch": "tsc -w",
+    "lint": "cross-env tslint -p tsconfig.json -t stylish",
+    "prettier": "node ./scripts/prettier.js write-changed",
+    "prettier-all": "node ./scripts/prettier.js write",
+    "bundle": "cross-env rimraf dist && node scripts/bundle.js",
+    "bundle:bench": "cross-env rimraf dist && node scripts/bundle.js bench",
+    "test": "cross-env TS_NODE_PROJECT=\"test/tsconfig.json\" mocha \"test/**/*.ts\" -c -R progress -r ts-node/register -r source-map-support/register --recursive --globals expect",
+    "test:watch": "npm run test -- --watch --watch-extensions ts",
+    "test:verbose": "npm run test -- -R spec",
+    "test:watch:verbose": "npm run test:watch -- -R spec",
+    "prepare-nightly": "node scripts/bump-dev-version",
+    "coverage": "cross-env TS_NODE_PROJECT=\"test/tsconfig.json\" nyc -n \"src/**/*.ts\" -e .ts -i ts-node/register -r text-summary -r lcov -r html npm test",
+    "post_coverage": "cross-env cat ./coverage/lcov.info | coveralls"
+  },
+  "devDependencies": {
+    "@types/mocha": "^5.2.6",
+    "@types/node": "^12.0.0",
+    "coveralls": "^3.0.3",
+    "cross-env": "^5.2.0",
+    "husky": "^2.2.0",
+    "mocha": "^6.1.4",
+    "nyc": "^14.1.0",
+    "path": "^0.12.7",
+    "prettier": "^1.17.0",
+    "rimraf": "^2.6.3",
+    "rollup": "^1.11.3",
+    "rollup-plugin-replace": "^2.2.0",
+    "rollup-plugin-terser": "^4.0.4",
+    "rollup-plugin-typescript2": "^0.21.0",
+    "source-map-support": "^0.5.12",
+    "ts-node": "^8.1.0",
+    "tsconfig-paths": "^3.8.0",
+    "tslint": "^5.16.0",
+    "tslint-microsoft-contrib": "^6.1.1",
+    "typescript": "^3.4.5",
+    "unexpected": "^11.4.1",
+    "unicode-12.0.0": "^0.8.0"
+  },
+  "husky": {
+    "hooks": {
+      "pre-commit": "node ./scripts/prettier.js check-changed"
+    }
+  },
+  "dependencies": {
+    "tslib": "^1.9.3"
+  }
+}

prettier.config.js

@@ -0,0 +1,10 @@
+'use strict';
+
+module.exports = {
+  semi: true,
+  singleQuote: true,
+  tabWidth: 2,
+  trailingComma: 'none',
+  useTabs: false,
+  printWidth: 120
+};

scripts/bump-dev-version.js

@@ -0,0 +1,64 @@
+const { readFile, writeFile } = require('fs');
+const project = require('./project');
+
+async function loadPackageJson(isLockfile) {
+  const file = isLockfile ? 'package-lock.json' : 'package.json';
+  return new Promise((resolve, reject) => {
+    readFile(project[file].path, (err, data) => {
+      if (err) {
+        reject(err);
+      }
+      const str = data.toString('utf8');
+      const json = JSON.parse(str);
+      resolve(json);
+    });
+  });
+}
+
+async function savePackageJson(pkg, isLockfile) {
+  const file = isLockfile ? 'package-lock.json' : 'package.json';
+  return new Promise((resolve, reject) => {
+    const str = JSON.stringify(pkg, null, 2);
+    writeFile(project[file].path, str, { encoding: 'utf8' }, err => {
+      if (err) {
+        reject(err);
+      }
+      resolve();
+    });
+  });
+}
+
+async function run() {
+  versionRegExp = /(\d+)\.(\d+)\.(\d+)($|\-)/;
+  const match = project.pkg.version.match(versionRegExp);
+  if (match === null) {
+    throw new Error(`package.json 'version' should match ${versionRegExp}`);
+  }
+  const major = match[1];
+  const minor = match[2];
+  const patch = match[3];
+  console.log(`current version: ${major}.${minor}.${patch}`);
+
+  const raw = new Date()
+    .toISOString()
+    .replace(/:|T|\.|-/g, '')
+    .slice(0, 8);
+  const y = raw.slice(0, 4);
+  const m = raw.slice(4, 6);
+  const d = raw.slice(6, 8);
+  const datestamp = `${y}${m}${d}`;
+  const newVersion = `${major}.${minor}.${patch}-dev.${datestamp}`;
+  console.log(`new version: ${newVersion}`);
+
+  const packageJson = await loadPackageJson(false);
+  packageJson.version = newVersion;
+  await savePackageJson(packageJson, false);
+
+  const packageLockJson = await loadPackageJson(true);
+  packageLockJson.version = newVersion;
+  await savePackageJson(packageLockJson, true);
+}
+
+run().then(() => {
+  console.log(`Done.`);
+});