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Generating a regular expression to match valid JavaScript identifiers (like https://mathiasbynens.be/demo/javascript-identifier-regex) in Node.js · GitHub
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Generating a regular expression to match valid JavaScript identifiers (like https://mathiasbynens.be/demo/javascript-identifier-regex) in Node.js
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| // ECMAScript 5.1: | |
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|
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| // Note: run `npm install` first! | |
| 'use strict'; | |
| const fs = require('fs'); | |
| const regenerate = require('regenerate'); | |
| const template = require('lodash.template'); | |
| // Which Unicode version should be used? | |
| const version = '11.0.0'; | |
| // Set up a shorthand function to import Unicode data. | |
| const get = function(what) { | |
| return require(`unicode-${ version }/${ what }/code-points.js`); | |
| }; | |
| // Get the Unicode categories needed to construct the ES5 regex. | |
| const Lu = get('General_Category/Uppercase_Letter'); | |
| const Ll = get('General_Category/Lowercase_Letter'); | |
| const Lt = get('General_Category/Titlecase_Letter'); | |
| const Lm = get('General_Category/Modifier_Letter'); | |
| const Lo = get('General_Category/Other_Letter'); | |
| const Nl = get('General_Category/Letter_Number'); | |
| const Mn = get('General_Category/Nonspacing_Mark'); | |
| const Mc = get('General_Category/Spacing_Mark'); | |
| const Nd = get('General_Category/Decimal_Number'); | |
| const Pc = get('General_Category/Connector_Punctuation'); | |
| // Get the Unicode properties needed to construct the ES6 regex. | |
| const ID_Start = get('Binary_Property/ID_Start'); | |
| const ID_Continue = get('Binary_Property/ID_Continue'); | |
| const Other_ID_Start = get('Binary_Property/Other_ID_Start'); | |
| const compileRegex = template('/^(?!(?:<%= reservedWords %>)$)' + | |
| '(?:<%= identifierStart %>)(?:<%= identifierPart %>)*$/'); | |
| const generateES5Regex = function() { // ES 5.1 | |
| // https://mathiasbynens.be/notes/javascript-identifiers#valid-identifier-names | |
| const identifierStart = regenerate('$', '_') | |
| .add(Lu, Ll, Lt, Lm, Lo, Nl) | |
| .removeRange(0x010000, 0x10FFFF); // Remove astral symbols. | |
| const identifierPart = identifierStart.clone() | |
| .add('\u200C', '\u200D', Mn, Mc, Nd, Pc) | |
| .removeRange(0x010000, 0x10FFFF); // Remove astral symbols. | |
| const reservedWords = [ | |
| // https://mathiasbynens.be/notes/reserved-keywords#ecmascript-5 | |
| 'do', 'if', 'in', 'for', 'let', 'new', 'try', 'var', 'case', 'else', | |
| 'enum', 'eval', 'null', 'this', 'true', 'void', 'with', 'break', 'catch', | |
| 'class', 'const', 'false', 'super', 'throw', 'while', 'yield', 'delete', | |
| 'export', 'import', 'public', 'return', 'static', 'switch', 'typeof', | |
| 'default', 'extends', 'finally', 'package', 'private', 'continue', | |
| 'debugger', 'function', 'arguments', 'interface', 'protected', | |
| 'implements', 'instanceof', | |
| // These aren’t strictly reserved words, but they kind of behave as if | |
| // they were. | |
| //'NaN', 'Infinity', 'undefined' | |
| ]; | |
| const regex = compileRegex({ | |
| 'reservedWords': reservedWords.join('|'), | |
| 'identifierStart': identifierStart.toString(), | |
| 'identifierPart': identifierPart.toString() | |
| }); | |
| return regex; | |
| }; | |
| const generateES6Regex = function() { | |
| // https://ecma-international.org/ecma-262/6.0/#sec-identifier-names-static-semantics-early-errors | |
| // https://unicode.org/reports/tr31/#Default_Identifier_Syntax | |
| // https://bugs.ecmascript.org/show_bug.cgi?id=2717#c0 | |
| const identifierStart = regenerate(ID_Start) | |
| // Note: this already includes `Other_ID_Start`. https://git.io/wRCAfQ | |
| .add( | |
| '$', | |
| '_' | |
| ); | |
| const identifierPart = regenerate(ID_Continue) | |
| // Note: `ID_Continue` already includes `Other_ID_Continue`. https://git.io/wRCAfQ | |
| .add(Other_ID_Start) | |
| .add( | |
| '$', | |
| '_', | |
| '\u200C', | |
| '\u200D' | |
| ); | |
| const reservedWords = [ | |
| // https://mathiasbynens.be/notes/reserved-keywords#ecmascript-6 | |
| 'do', 'if', 'in', 'for', 'let', 'new', 'try', 'var', 'case', 'else', | |
| 'enum', 'eval', 'null', 'this', 'true', 'void', 'with', 'await', 'break', | |
| 'catch', 'class', 'const', 'false', 'super', 'throw', 'while', 'yield', | |
| 'delete', 'export', 'import', 'public', 'return', 'static', 'switch', | |
| 'typeof', 'default', 'extends', 'finally', 'package', 'private', | |
| 'continue', 'debugger', 'function', 'arguments', 'interface', 'protected', | |
| 'implements', 'instanceof', | |
| // These aren’t strictly reserved words, but they kind of behave as if | |
| // they were. | |
| //'NaN', 'Infinity', 'undefined' | |
| ]; | |
| const regex = compileRegex({ | |
| 'reservedWords': reservedWords.join('|'), | |
| 'identifierStart': identifierStart.toString(), | |
| 'identifierPart': identifierPart.toString() | |
| }); | |
| return regex; | |
| }; | |
| fs.writeFileSync( | |
| 'ecmascript-5.1.js', | |
| `// ECMAScript 5.1:\n\n${ generateES5Regex() }\n` | |
| ); | |
| fs.writeFileSync( | |
| 'ecmascript-6.js', | |
| `// ECMAScript 6:\n\n${ generateES6Regex() }\n` | |
| ); |
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| { | |
| "private": true, | |
| "scripts": { | |
| "build": "node javascript-identifier-regex.js" | |
| }, | |
| "dependencies": { | |
| "lodash.template": "^4.4.0", | |
| "regenerate": "^1.4.0", | |
| "unicode-11.0.0": "^0.7.7" | |
| } | |
| } |
What license are you releasing this under? I would very much like to use the ES6 regex in a project, but since the module does not exist in NPM, I must include it directly. I do not want to include it, however, without the appropriate permission. https://github.com/coreyp1/defiant is my project, if you are curious. My project is licensed MIT.
Ideally, you should put this into NPM, since it is very helpful! If it is already in NPM, and I have overlooked it, then please accept my apologies for bothering you.
What about proto?
@mathiasbynens Is there a simpler version using \p?
@mathiasbynens Much simpler! Thanks!
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This is the Node.js version of https://mathiasbynens.be/demo/javascript-identifier-regex.
Patches based on this gist: