diff --git a/.babelrc b/.babelrc new file mode 100755 index 0000000..7a0c5a7 --- /dev/null +++ b/.babelrc @@ -0,0 +1,21 @@ +{ + "env": { + "development": { + "presets": [ + ["@babel/env"] + ], + "plugins": [ + "add-module-exports" + ] + }, + "production": { + "presets": [ + ["@babel/env"], + "minify" + ], + "plugins": [ + "add-module-exports" + ] + } + } +} diff --git a/.eslintrc.js b/.eslintrc.js new file mode 100755 index 0000000..35dbf3c --- /dev/null +++ b/.eslintrc.js @@ -0,0 +1,23 @@ +module.exports = { + env: { + browser: true, + node: true, + es2021: true + }, + extends: ['eslint:recommended'], + parserOptions: { + ecmaVersion: 12, + sourceType: 'module' + }, + rules: { + indent: 'off', + 'linebreak-style': ['error', 'unix'], + quotes: ['error', 'single', { avoidEscape: true }], + semi: 'off', + 'no-extra-semi': 'off', + 'no-unused-vars': 'off', + 'no-empty': 'off', + 'no-misleading-character-class': 'off', + 'no-mixed-spaces-and-tabs': ['warn', 'smart-tabs'] + } +} diff --git a/.gitignore b/.gitignore new file mode 100755 index 0000000..cac6a8f --- /dev/null +++ b/.gitignore @@ -0,0 +1,27 @@ +# Logs +logs +*.log +npm-debug.log* + +# Runtime data +pids +*.pid +*.seed + +# Dependency directories +node_modules +jspm_packages + +# Editors +.idea + +# Lib +lib + +# npm package lock +package-lock.json +yarn.lock + +# Others +.DS_Store +Thumbs.db diff --git a/.npmignore b/.npmignore new file mode 100755 index 0000000..f4c32e3 --- /dev/null +++ b/.npmignore @@ -0,0 +1,16 @@ +# Log files +*.log +npm-debug.log* + +# Dependency directories +node_modules + +# npm package lock +package-lock.json +yarn.lock + +# Project files +src +.eslintrc +.babelrc +.gitignore diff --git a/.prettierrc b/.prettierrc new file mode 100755 index 0000000..67d0eb5 --- /dev/null +++ b/.prettierrc @@ -0,0 +1,7 @@ +{ + "trailingComma": "none", + "tabWidth": 4, + "useTabs": true, + "semi": false, + "singleQuote": true +} diff --git a/.vscode/settings.json b/.vscode/settings.json new file mode 100755 index 0000000..0c4a68e --- /dev/null +++ b/.vscode/settings.json @@ -0,0 +1,6 @@ +{ + "editor.formatOnSave": true, + "files.insertFinalNewline": true, + "editor.defaultFormatter": "esbenp.prettier-vscode", + "prettier.useTabs": true +} diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..11dddd0 --- /dev/null +++ b/LICENSE @@ -0,0 +1,278 @@ + GNU GENERAL PUBLIC LICENSE + Version 2, June 1991 + + Copyright (C) 1989, 1991 Free Software Foundation, Inc. + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The licenses for most software are designed to take away your +freedom to share and change it. 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The Free Software Foundation may publish revised and/or new versions +of the General Public License from time to time. Such new versions will +be similar in spirit to the present version, but may differ in detail to +address new problems or concerns. + +Each version is given a distinguishing version number. If the Program +specifies a version number of this License which applies to it and "any +later version", you have the option of following the terms and conditions +either of that version or of any later version published by the Free +Software Foundation. If the Program does not specify a version number of +this License, you may choose any version ever published by the Free Software +Foundation. + + 10. If you wish to incorporate parts of the Program into other free +programs whose distribution conditions are different, write to the author +to ask for permission. For software which is copyrighted by the Free +Software Foundation, write to the Free Software Foundation; we sometimes +make exceptions for this. Our decision will be guided by the two goals +of preserving the free status of all derivatives of our free software and +of promoting the sharing and reuse of software generally. + + NO WARRANTY + + 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY +FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN +OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES +PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED +OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF +MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS +TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE +PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, +REPAIR OR CORRECTION. + + 12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING +WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR +REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, +INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING +OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED +TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY +YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER +PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE +POSSIBILITY OF SUCH DAMAGES. diff --git a/README.md b/README.md new file mode 100644 index 0000000..1c2b57b --- /dev/null +++ b/README.md @@ -0,0 +1,134 @@ +# JavaScript Variable Name Validator + +Validate any string as a JavaScript variable name, taking into consideration both the ECMAScript 6 specification and Unicode 8.0.0, as well as reserved words and invalid escape sequences in older engines. + +Adapted from [JavaScript identifier validator](https://github.com/mathiasbynens/mothereff.in/tree/master/js-variables) by [Mathias Bynens](https://mathiasbynens.be/) and repackaged as an npm module. + +## Installation + +**Using npm** + +``` +npm install validate-variable +``` + +**Using yarn** + +``` +yarn add validate-variable +``` + +## Importing + +**Import as an ES6 module** + +```javascript +import validateVariable, { isValidVariable } from 'validate-variable' +``` + +**Import as a CommonJS module** + +```javascript +const { validateVariable, isValidVariable } = require('validate-variable') +``` + +## Basic usage + +```javascript +console.log(isValidVariable('ಠ_ಠ')) +``` + +Returning: + +```javascript +true +``` + +## Advanced usage + +Includes any errors and/or warnings with the return value. + +### With errors + +```javascript +console.log(validateVariable('await')) +``` + +Returning: + +```javascript +{ + valid: false, + errors: { + reserved: true + } +} +``` + +### With warnings + +```javascript +console.log(validateVariable('undefined')) +``` + +Returning: + +```javascript +{ + valid: true, + warnings: { + immutable: true + } +} +``` + +## Types of errors + +### invalidIdentifier + +The format of the variable name is invalid according to ES6 + Unicode 8.0.0 + +### reserved + +The variable matches any reserved keywords like `return` or `await` + +## Types of warnings + +### es3 + +The variable is an ES3 reserved word. You may want to avoid using it if support for older JavaScript engines is a concern. + +### es5 + +Invalid identifier as per ES5. You may want to avoid using it if support for older JavaScript engines is a concern. + +### zeroWidth + +The variable contains zero-width characters that are allowed in IdentifierPart as per ES5, but not in ES3. You may want to avoid using it if support for older JavaScript engines is a concern. + +### unicode + +Invalid identifier according to Unicode v5.1.0. You may want to avoid using it if support for JavaScript engines with outdated Unicode data tables is a concern. + +### immutable + +The `NaN`, `Infinity`, and `undefined` properties of the global object are immutable or read-only. Setting them won’t have an effect. Avoid using them as variable names. + +## Strict mode + +Activate **strict mode** by setting the second argument to `true` when calling either method. +This makes any warnings return an invalid result. + +```javascript +console.log(isValidVariable('NaN', true)) +``` + +Returning: + +```javascript +false +``` + +## License + +Licensed under the [GPL 2.0 license](LICENSE). diff --git a/index.js b/index.js new file mode 100644 index 0000000..5021ea3 --- /dev/null +++ b/index.js @@ -0,0 +1,220 @@ +/*! https://mths.be/fromcodepoint v0.2.1 by @mathias */ +if (!String.fromCodePoint) { + ;(() => { + let defineProperty = () => { + let result + + // IE 8 only supports `Object.defineProperty` on DOM elements + try { + let object = {} + let $defineProperty = Object.defineProperty + + result = + $defineProperty(object, object, object) && $defineProperty + } catch (exception) {} + + return result + } + + let stringFromCharCode = String.fromCharCode + let floor = Math.floor + + let fromCodePoint = function (_) { + let MAX_SIZE = 0x4000 + let codeUnits = [] + let highSurrogate + let lowSurrogate + let index = -1 + let length = arguments.length + + if (!length) { + return '' + } + + let result = '' + + while (++index < length) { + let codePoint = Number(arguments[index]) + + if ( + !isFinite(codePoint) || // `NaN`, `+Infinity`, or `-Infinity` + codePoint < 0 || // not a valid Unicode code point + codePoint > 0x10ffff || // not a valid Unicode code point + floor(codePoint) != codePoint // not an integer + ) { + throw RangeError('Invalid code point: ' + codePoint) + } + + if (codePoint <= 0xffff) { + // BMP code point + codeUnits.push(codePoint) + } else { + // Astral code point; split in surrogate halves + // https://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae + codePoint -= 0x10000 + highSurrogate = (codePoint >> 10) + 0xd800 + lowSurrogate = (codePoint % 0x400) + 0xdc00 + codeUnits.push(highSurrogate, lowSurrogate) + } + + if (index + 1 == length || codeUnits.length > MAX_SIZE) { + result += stringFromCharCode.apply(null, codeUnits) + codeUnits.length = 0 + } + } + + return result + } + + if (defineProperty) { + defineProperty(String, 'fromCodePoint', { + value: fromCodePoint, + configurable: true, + writable: true + }) + } else { + String.fromCodePoint = fromCodePoint + } + })() +} + +// According to ES6 + Unicode 8.0.0 +const regexIdentifier = + 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+ // According to ES6 + Unicode 5.1.0 + regexIdentifierUnicode5 = + 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D-\uDCC3\uDCC5-\uDD05\uDD07-\uDD0A\uDD0D-\uDD14\uDD16-\uDD1C\uDD1E-\uDD39\uDD3B-\uDD3E\uDD40-\uDD44\uDD46\uDD4A-\uDD50\uDD52-\uDEA5\uDEA8-\uDEC0\uDEC2-\uDEDA\uDEDC-\uDEFA\uDEFC-\uDF14\uDF16-\uDF34\uDF36-\uDF4E\uDF50-\uDF6E\uDF70-\uDF88\uDF8A-\uDFA8\uDFAA-\uDFC2\uDFC4-\uDFCB\uDFCE-\uDFFF]|[\uD840-\uD868][\uDC00-\uDFFF]|\uD869[\uDC00-\uDED6]|\uD87E[\uDC00-\uDE1D]|\uDB40[\uDD00-\uDDEF])*$/, + // According to ES5 + Unicode 8.0.0 + regexIdentifierES5 = + 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+ regexES6ReservedWord = + /^(?:do|if|in|for|let|new|try|var|case|else|enum|eval|false|null|this|true|void|with|await|break|catch|class|const|super|throw|while|yield|delete|export|import|public|return|static|switch|typeof|default|extends|finally|package|private|continue|debugger|function|arguments|interface|protected|implements|instanceof)$/, + // ES3 reserved words that aren’t ES6 reserved words + regexES3ReservedWordExclusive = + /^(?:int|byte|char|goto|long|final|float|short|double|native|throws|boolean|abstract|volatile|transient|synchronized)$/, + // Immutable properties of the global object + regexImmutableProps = /^(?:NaN|Infinity|undefined)$/, + // Zero-width characters that are allowed in IdentifierPart as per ES5 + regexZeroWidth = /\u200C|\u200D/ + +const validateVariable = (variable, strict = false) => { + let replaced + let es3 + let es5 + let unicode + let immutable + let zeroWidth + let reserved + let invalidIdentifier + let result + + // Both Unicode escapes and Unicode code point escapes are allowed. + // Note: the replacement must happen in a single `replace` call. + replaced = variable.replace( + /\\u([a-fA-F0-9]{4})|\\u\{([0-9a-fA-F]{1,})\}/g, + function ($0, $1, $2) { + var codePoint = parseInt($2 || $1, 16) + // If it’s a surrogate… + if (codePoint >= 0xd800 && codePoint <= 0xdfff) { + // Return a character that is never valid in an identifier. + // This prevents the surrogate from pairing with another. + return '\0' + } + return String.fromCodePoint(codePoint) + } + ) + + es5 = !regexIdentifierES5.test( + // Only Unicode escapes are allowed in ES5 identifiers. + variable.replace(/\\u([a-fA-F0-9]{4})/g, function ($0, $1) { + return String.fromCodePoint(parseInt($1, 16)) + }) + ) + + invalidIdentifier = !regexIdentifier.test(replaced) + reserved = regexES6ReservedWord.test(replaced) + + if (invalidIdentifier || reserved) { + result = { + valid: false + } + + let errors = { + invalidIdentifier, + reserved + } + + errors = Object.keys(errors).reduce((previousValue, currentValue) => { + if (errors[currentValue]) { + return { + ...previousValue, + [currentValue]: errors[currentValue] + } + } + + return previousValue + }, {}) + + if (Object.keys(errors).length) { + result = { + ...result, + errors + } + } + } else { + es3 = regexES3ReservedWordExclusive.test(replaced) + + if (!regexIdentifier.test(replaced)) { + es5 = true + es3 = false + } + + unicode = !regexIdentifierUnicode5.test(replaced) + immutable = regexImmutableProps.test(replaced) + zeroWidth = regexZeroWidth.test(replaced) + + result = { + valid: true + } + + let warnings = { + es3, + es5, + unicode, + immutable, + zeroWidth + } + + warnings = Object.keys(warnings).reduce( + (previousValue, currentValue) => { + if (warnings[currentValue]) { + return { + ...previousValue, + [currentValue]: warnings[currentValue] + } + } + + return previousValue + }, + {} + ) + + if (Object.keys(warnings).length) { + result = { + valid: !strict, + warnings + } + } + } + + return result +} + +const isValidVariable = (variable, strict) => { + return validateVariable(variable, strict).valid +} + +export { isValidVariable } +export { validateVariable } + +export default validateVariable diff --git a/package.json b/package.json new file mode 100644 index 0000000..3803470 --- /dev/null +++ b/package.json @@ -0,0 +1,68 @@ +{ + "name": "validate-variable", + "version": "1.0.0", + "description": "Validate any string as a JavaScript variable name, taking into consideration both the ECMAScript 6 specification and Unicode 8.0.0, as well as reserved words and invalid escape sequences in older engines.", + "module": "./lib", + "main": "./lib", + "scripts": { + "clean": "rimraf lib", + "lint": "eslint index.js", + "build": "webpack --mode=production --no-progress --hide-modules --config=webpack.config.js", + "prepublish": "npm run clean && npm run lint && npm run build" + }, + "files": [ + "lib", + "src" + ], + "keywords": [ + "valid", + "validate", + "variable", + "identifier", + "es3", + "es5", + "es2015", + "unicode", + "immutable", + "zero width", + "reserved", + "keyword" + ], + "author": "André Ekeberg (https://andreekeberg.se/en/)", + "bugs": { + "url": "https://github.com/andreekeberg/validate-variable/issues" + }, + "homepage": "https://github.com/andreekeberg/validate-variable", + "repository": { + "type": "git", + "url": "git+https://github.com/andreekeberg/validate-variable.git" + }, + "license": "GPL-2.0-or-later", + "devDependencies": { + "@babel/core": "^7.10.4", + "@babel/plugin-transform-modules-amd": "^7.10.5", + "@babel/plugin-transform-modules-commonjs": "^7.6.0", + "@babel/plugin-transform-runtime": "^7.6.2", + "@babel/polyfill": "^7.10.4", + "@babel/preset-env": "^7.8.3", + "@babel/register": "^7.10.4", + "@babel/runtime": "^7.6.2", + "@babel/runtime-corejs3": "^7.6.2", + "babel-cli": "^6.26.0", + "babel-eslint": "^10.0.1", + "babel-loader": "^8.0.6", + "babel-plugin-add-module-exports": "^1.0.2", + "babel-polyfill": "^6.26.0", + "babel-preset-env": "^1.6.1", + "babel-preset-minify": "^0.5.0", + "babel-runtime": "^6.26.0", + "core-js": "^3.2.1", + "cross-env": "^5.2.1", + "eslint": "^7.32.0", + "eslint-config-standard": "^16.0.3", + "eslint-plugin-node": "^11.1.0", + "rimraf": "^2.6.2", + "webpack": "^4.40.2", + "webpack-cli": "^3.3.9" + } +} diff --git a/webpack.config.js b/webpack.config.js new file mode 100755 index 0000000..914c111 --- /dev/null +++ b/webpack.config.js @@ -0,0 +1,38 @@ +require('core-js/stable') +require('regenerator-runtime/runtime') + +const path = require('path') + +module.exports = { + entry: { + index: './index.js' + }, + output: { + path: path.resolve(__dirname, 'lib'), + filename: 'index.js', + libraryTarget: 'umd', + globalObject: 'this' + }, + module: { + rules: [ + { + test: /\.js$/, + exclude: /node_modules/, + use: { + loader: 'babel-loader', + options: { + plugins: [ + [ + '@babel/plugin-transform-runtime', + { + corejs: 3 + } + ] + ], + presets: ['@babel/preset-env'] + } + } + } + ] + } +}