web-audio-test-api/lib/decorators/methods/param.js

Web Audio API test library for CI

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = param;
var map = new WeakMap();

function getFromMap(map, key, Container) {
  if (map.has(key)) {
    return map.get(key);
  }

  var value = new Container();

  map.set(key, value);

  return value;
}

function check(values, validators) {
  for (var i = 0; i < validators.length; i++) {
    if (validators[i].optional === true && values.length <= i) {
      break;
    }
    if (!validators[i].validator.test(values[i])) {
      return i;
    }
  }
  return -1;
}

function param(paramName, validator) {
  return function (target, name, descriptor) {
    var func = descriptor.value;
    var klasses = getFromMap(map, target, Map);
    var validators = getFromMap(klasses, name, Array);
    var optional = /^\[\s*\w+?\s*\]$/.test(paramName);

    if (optional) {
      paramName = paramName.replace(/^\[|\]$/g, "").trim();
    }

    validators.unshift({ paramName: paramName, validator: validator, optional: optional });

    if (validators.length === 1) {
      descriptor.value = function param() {
        for (var _len = arguments.length, args = Array(_len), _key = 0; _key < _len; _key++) {
          args[_key] = arguments[_key];
        }

        var errIndex = check(args, validators);

        if (errIndex !== -1) {
          throw new TypeError(this.constructor.name + "#" + name + "(); argument(" + errIndex + ") should be a " + validators[errIndex].validator.name + ", but got: " + args[errIndex]);
        }

        return func.call.apply(func, [this].concat(args));
      };
    }

    return descriptor;
  };
}