coderaiser🤫Goldstein 
"You haven't a real appreciation of Newspeak, Winston," he said almost sadly. "Even when you write it you're still thinking in Oldspeak. I've read some of those pieces that you write in The Times occasionally. They're good enough, but they're translations. In your heart you'd prefer to stick to Oldspeak, with all its vagueness and its useless shades of meaning. You don't grasp the beauty of the destruction of words. Do you know that Newspeak is the only language in the world whose vocabulary gets smaller every year?"
(c) “1984”, George Orwell
JavaScript with no limits 🤫 with built-in JSX and TypeScript. Language ruled by the users, create an issue with ideas of a new language construction and what is look like in JavaScript, and most likely we implement it :).
Install
npm i goldstein esbuild -gCLI
$ cat > 1.gs
export fn hello() {
return 'world';
}
$ gs 1.gs
$ cat 1.js
function hello() {
return "world";
}
export {
hello,
};Let's do a bit more!
const a = () => throw 'hello';
if a > 2 {
log('hello');
}Will give us:
const a = () => {
throw 'hello';
};
if (a > 2) {
log('hello');
}API
compile(source)
When you need to compile Goldstein to JavaScript use:
import {compile} from 'goldstein';
compile(`
fn hello() {
guard text !== "world" else {
return ""
}
return "Hello " + text
}
`);
// returns
`
function hello() {
if (!(text !== 'world')) {
return '';
}
return 'Hello ' + text;
}
`;By default, all keywords mentioned in the next section used, but you can limit the list setting with keywords option.
You can add any keywords, and even create your own:
import {compile, keywords} from 'goldstein';
const source = `
fn hello() {
return id('hello');
}
`;
const {keywordFn} = keywords;
compile(source, {
keywords: {
...keywords,
keywordFn: null,
keywordId(Parser) {
const {keywordTypes} = Parser.acorn;
return class extends Parser {};
},
},
rules: {
declare: ['on', {
declarations: {
id: 'const id = (a) => a',
},
}],
},
});
// returns
`
const id = (a) => a;
function hello() {
return id('hello');
}
`;You can declare variables with @putout/operator-declare.
parse(source, {type, keywords})
When you need to get JavaScript Babel AST use parse:
import {parse} from 'goldstein';
parse(`
fn hello() {
guard text !== "world" else {
return ""
}
return "Hello " + text
}
`);
// returns Babel ASTYou can parse to ESTree:
const options = {
type: 'estree',
};
parse(`
fn hello() {
guard text !== "world" else {
return ""
}
return "Hello " + text
`, options);print(ast)
You can make any modifications to Goldstein AST and then print back to Goldstein:
import {parse, print} from 'goldstein';
const ast = parse(`const t = try f('hello')`);
const source = print(ast);convert(source)
You can even convert JavaScript to Goldstein with:
import {convert} from 'goldstein';
const ast = convert(`const t = tryCatch(f, 'hello')`);
// returns
`const t = try f('hello')`;Keywords
Goldstein is absolutely compatible with JavaScript, and it has extensions. Here is the list.
fn
You can use fn to declare a function:
fn hello() {
return 'world';
}This is the same as:
function hello() {
return 'world';
}append array
Append new elements to an array just like in Swift:
let a = [1];
a += [2, 3];Is the same as:
const a = [1];
a.push(...[2, 3]);guard
Applies not to IfCondition:
fn hello() {
guard text !== "world" else {
return ""
}
return "Hello " + text
}Is the same as:
function hello() {
if (text === 'world') {
return '';
}
return `Hello ${text}`;
}try
try can be used as an expression.
Applies tryCatch:
const [error, result] = try hello('world');Is the same as:
import tryCatch from 'try-catch';
const [error, result] = tryCatch(hello, 'world');and
const [error, result] = try await hello('world');Is the same as:
import tryToCatch from 'try-catch';
const [error, result] = await tryToCatch(hello, 'world');operator-safe-assignment
You can use ?= instead of try:
const [error, result] ?= hello('world');Is the same as:
import tryCatch from 'try-catch';
const [error, result] = tryCatch(hello, 'world');and
const [error, result] ?= await hello('world');Is the same as:
import tryToCatch from 'try-catch';
const [error, result] = await tryToCatch(hello, 'world');should
should can be used as an expression (just like try).
This keyword is useful if you want to prevent a function call (also async) to throw an error because you don't need to have any result and the real execution is just optional (so runs if supported).
should hello()Is the same as:
try hello();☝️ Warning: this feature can be helpful but also dangerous especially if you're debugging your application. In fact, this is made to be used as an optional function call (ex. should load content, but not necessary and knowing this feature is optional), if you call a function in this way while debugging, no error will be printed and the application will continue run as nothing happened.
freeze
You can use freeze instead of Object.freeze() like that:
freeze {
'example': true
}Is the same as:
Object.freeze({
example: true,
});if
You can omit parens. But you must use braces in this case.
if a > 3 {
hello();
}Also you can use if let syntax:
if let x = a?.b {
print(x);
}throw expression
You can use throw as expression, just like that:
const a = () => throw 'hello';Curry
Similar to partial application:
const sum = (a, b) => a + b;
const inc = sum~(1);
inc(5);
// returns
6Import
When you import .gs files during compile step it will be replaced with .js:
// hello.js
export const hello = () => 'world';
// index.js1
import hello from './hello.gs';Will be converted to:
// index.js
import hello from './hello.js';Also, also supported:
import hello from hello;And will be converted to:
import hello from 'hello';FunctionDeclaration with Arrow
If you mistakenly put => in function declaration:
function hello() => {
}That absolutely fine, it will be converted to:
function hello() {}Broken String
When you accidentally broke string, Goldstein will fix it:
-const a = 'hello
+const a = 'hello';
-const a = ‘hello world’;
+const a = 'hello world';Missing Initializer
Forget to add assignment (=), not problem!
-const {code, places} await samadhi(source);
+const {code, places} = await samadhi(source);Useless comma
Added useless comma (,)? no problem!
const a = {
- b,,
+ b,
};Useless semicolon
Added useless semicolon (;)? no problem!
const a = {
- b;
+ b,
};
const a = {
- b(){},
+ b(){}
};Assign from
const a = from 'a';The same as:
const a = require('a');Export without const
export x = () => {};The same as:
export const x = () => {};Wrong brace )
-import a from 'a');
+import a from 'a';How to contribute?
Clone the registry, create a new keyword with a prefix keyword-, then create directory fixture and put there two files with extensions .js and .gs. Half way done 🥳!
Then goes test and implementation in index.js1 and index.spec.js accordingly. Use scripts:
npm testUPDATE=1 npm test- updatefixtures;AST=1 npm test- logAST;npm run coverage;npm run fix:lint;
Update docs and make PR, that's it!
License
MIT