atom-nuclide/pkg/nuclide-format-js-common/lib/utils/printRoot.js

A unified developer experience for web and mobile development, built as a suite of features on top of Atom to provide hackability and the support of an active community.

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

/*
 * Copyright (c) 2015-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the license found in the LICENSE file in
 * the root directory of this source tree.
 */

var _NewLine2;

function _NewLine() {
  return _NewLine2 = _interopRequireDefault(require('./NewLine'));
}

function printRoot(root) {
  // Print the new source.
  var output = root.toSource({ quote: 'single', trailingComma: true });

  // Remove all new lines between require fences that are not explicitly added
  // by the NewLine module.
  var lines = output.split('\n');
  var first = lines.length - 1;
  var last = 0;
  for (var i = 0; i < lines.length; i++) {
    if (lines[i].indexOf((_NewLine2 || _NewLine()).default.literal) !== -1) {
      first = Math.min(first, i);
      last = Math.max(last, i);
    }
  }

  // Filter out the empty lines that are between NewLine markers.
  output = lines.filter(function (line, index) {
    return line || index < first || index > last;
  }).join('\n');

  // Remove the NewLine markers.
  output = (_NewLine2 || _NewLine()).default.replace(output);

  // Remove new lines at the start.
  output = output.replace(/^\n{1,}/, '');

  // Make sure there is a new line at the end.
  if (!/^[\w\W]*\n$/.test(output)) {
    output += '\n';
  }

  return output;
}

module.exports = printRoot;