nisp/lib/async.js

A language that for easily build cross-language language

"use strict";
exports.__esModule = true;
var core_1 = require("../core");
var root = typeof window === 'object' ? window : global;
// ["fn", <arg1>, <arg2>, ...]
exports["default"] = function (fn, customPromise) {
    var P = customPromise || root['Promise']; // eslint-disable-line
    return core_1.macro(function (ctx) {
        var ast = ctx.ast;
        var syncedArgs = [];
        var p = ast.length > 1 ?
            P.resolve(core_1.arg(ctx, 1))
            : P.resolve();
        var f = function (i) { return function (v) {
            syncedArgs.push(v);
            return core_1.arg(ctx, i);
        }; };
        for (var i = 2; i < ast.length; i++) {
            p = p.then(f(i));
        }
        return p.then(function (v) {
            if (ast.length > 1)
                syncedArgs.push(v);
            return fn.apply(ctx, syncedArgs);
        });
    });
};