sweet js ML-style auto-curried function literals

curry.sjs

// Auto-curried fun macro, inspired by ML syntax
//
// Examples:
// let add = fun x y { x + y }
// let map = fun f x { x.map(f) }
syntax fun = ctx => {
  const ids = []
  let ret = null

  // start parsing our context
  for (let value of ctx) {
    // but we only want identifiers ...
    if (value.isIdentifier()) {
      ids.unshift(value)
    }
  
    // ... and the first set of braces afterwards
    if (value.isBraces()) {
      ret = value.inner() // get all of the stuff inside the braces
      break // after the first set of braces, our macro is over; stop parsing
    }
  }

  // because we unshifted our identifiers, we can iterate over them 
  for (let value of ids) {
    // and just wrap our return value in a function for each identifier
    ret = #`function(${value}) { return ${ret}; }`
  }

  return ret
}