caml_splice_call.ml

(* Copyright (C) 2019- Hongbo Zhang, Authors of ReScript
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * In addition to the permissions granted to you by the LGPL, you may combine
 * or link a "work that uses the Library" with a publicly distributed version
 * of this file to produce a combined library or application, then distribute
 * that combined work under the terms of your choosing, with no requirement
 * to comply with the obligations normally placed on you by section 4 of the
 * LGPL version 3 (or the corresponding section of a later version of the LGPL
 * should you choose to use a later version).
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *)

type obj = Obj.t

let spliceApply : obj -> obj -> obj = [%raw{|function(fn,args){
  var i, argLen; 
  argLen = args.length
  var applied = []
  for(i = 0; i < argLen - 1; ++i){
    applied.push(args[i])
  }
  var lastOne = args[argLen - 1]
  for(i = 0; i < lastOne.length; ++i ){
    applied.push(lastOne[i])
  }
  return fn.apply(null,applied)
}|}] 

let spliceNewApply : obj -> obj -> obj = [%raw{|function (ctor,args){
  var i, argLen;
  argLen = args.length
  var applied = [null] // Function.prototype.bind.apply(fn, args) requires the first element in `args` to be `null`
  for(i = 0; i < argLen - 1; ++i){
    applied.push(args[i])
  }
  var lastOne = args[argLen - 1]
  for(i = 0; i < lastOne.length; ++i ){
    applied.push(lastOne[i])
  }
  var C = Function.prototype.bind.apply(ctor, applied)
  return new C()
}|}]

let spliceObjApply : obj -> obj -> obj -> obj = [%raw{|function(obj,name,args){
  var i, argLen; 
  argLen = args.length
  var applied = []
  for(i = 0; i < argLen - 1; ++i){
    applied.push(args[i])
  }
  var lastOne = args[argLen - 1]
  for(i = 0; i < lastOne.length; ++i ){
    applied.push(lastOne[i])
  }
  return (obj[name]).apply(obj,applied)
}|}]