lebab/lib/Transformer.js

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});

var _slicedToArray = function () { function sliceIterator(arr, i) { var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i["return"]) _i["return"](); } finally { if (_d) throw _e; } } return _arr; } return function (arr, i) { if (Array.isArray(arr)) { return arr; } else if (Symbol.iterator in Object(arr)) { return sliceIterator(arr, i); } else { throw new TypeError("Invalid attempt to destructure non-iterable instance"); } }; }();

var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();

var _recast = require('recast');

var _recast2 = _interopRequireDefault(_recast);

var _Parser = require('./Parser');

var _Parser2 = _interopRequireDefault(_Parser);

var _Logger = require('./Logger');

var _Logger2 = _interopRequireDefault(_Logger);

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

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

/**
 * Runs transforms on code.
 */
var Transformer = function () {
  /**
   * @param {Function[]} transforms List of transforms to perform
   */
  function Transformer() {
    var transforms = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : [];

    _classCallCheck(this, Transformer);

    this.transforms = transforms;
  }

  /**
   * Tranforms code using all configured transforms.
   *
   * @param {String} code Input ES5 code
   * @return {Object} Output ES6 code
   */


  _createClass(Transformer, [{
    key: 'run',
    value: function run(code) {
      var logger = new _Logger2.default();

      return {
        code: this.applyAllTransforms(code, logger),
        warnings: logger.getWarnings()
      };
    }
  }, {
    key: 'applyAllTransforms',
    value: function applyAllTransforms(code, logger) {
      var _this = this;

      return this.ignoringHashBangComment(code, function (js) {
        var ast = _recast2.default.parse(js, { parser: _Parser2.default });

        _this.transforms.forEach(function (transformer) {
          transformer(ast.program, logger);
        });

        return _recast2.default.print(ast, {
          lineTerminator: _this.detectLineTerminator(code),
          objectCurlySpacing: false
        }).code;
      });
    }

    // strips hashBang comment,
    // invokes callback with normal js,
    // then re-adds the hashBang comment back

  }, {
    key: 'ignoringHashBangComment',
    value: function ignoringHashBangComment(code, callback) {
      var _code$match = code.match(/^(\s*#!.*?\r?\n|)([\s\S]*)$/),
          _code$match2 = _slicedToArray(_code$match, 3),
          /* all */hashBang = _code$match2[1],
          js = _code$match2[2];

      return hashBang + callback(js);
    }
  }, {
    key: 'detectLineTerminator',
    value: function detectLineTerminator(code) {
      var hasCRLF = /\r\n/.test(code);
      var hasLF = /[^\r]\n/.test(code);

      return hasCRLF && !hasLF ? '\r\n' : '\n';
    }
  }]);

  return Transformer;
}();

exports.default = Transformer;
module.exports = exports['default'];