gulp-cause/es5/cause-load.js

declarative gulp tasks causality

'use strict';

exports.__esModule = true;
exports.default = load;

var _ramda = require('ramda');

var _ramda2 = _interopRequireDefault(_ramda);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

function dataError(what) {
  throw new Error('Don\'t know how to convert \'' + what + '\' of type ' + _ramda2.default.type(what) + ' to a Map.');
}

function evenLength(a) {
  if (a.length % 2 === 0) return true;
}

function atom(a) {
  // Array-to-Map conversion, where a is a flat array of even length
  var m = new Map();
  if (evenLength(a) && a.length >= 2) {
    for (var i = 0; i < a.length; i = i + 2) {
      m.set(a[i], a[i + 1]);
    }
  }
  return m;
}

function load(what) {
  switch (_ramda2.default.type(what)) {
    case 'Map':
      return what;
    case 'Object':
      return new Map(_ramda2.default.toPairs(what));
    case 'Array':
      if (_ramda2.default.type(what[0]) === 'Array' && what[0].length === 2) return new Map(what);else if (evenLength(what)) return atom(what);else dataError(what);
      break;
    default:
      dataError(what);
  }
}
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