Quick and dirty regularStyle-to-CPS convertor in sweet.js

app.js

macro asyncp {
   
    case { await { $body ... } $rest ... } => {
        defers = 0;
        done = (function() { asyncp { $rest ... } });
        asyncp { $body ... }
    }
  
    case { $token } => { $token }
    
    case { $token $rest ... } => {
        $token
        asyncp { $rest ... }
    }


}

macro async {
    case { $body ... } => {
        var deferVars = {};
        var defers, done;
        var defer = function() {
            var names = arguments;       
            ++defers;
            return function() {
                for (var k = 0; k < names.length; ++k)
                    deferVars[names[k]] = arguments[k];
                if (!--defers) done();
            };
        }
        asyncp { $body ... }
    }
}


var lolget = function(cb) {
    setTimeout(function() {
        cb(25);
    }, 1000); 
} 

async {
    var t = Date.now();
    console.log("haha");
    await { lolget(defer("rofl")); }
    console.log("rofl", deferVars.rofl, Date.now() - t);
    await { setTimeout(defer(), 1000); }
    console.log("lol", Date.now() - t);
}

output.txt

Output:

haha
rofl 25 1006
lol 2009

todo:
- for, if