e-lado/node_modules0/jest-snapshot/build/utils.js

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/**
 * Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 *
 * 
 */

'use strict';



const createDirectory = require('jest-util').createDirectory;
const fileExists = require('jest-file-exists');
const path = require('path');
const prettyFormat = require('pretty-format');
const fs = require('fs');
const naturalCompare = require('natural-compare');
const getPlugins = require('./plugins').getPlugins;

const SNAPSHOT_EXTENSION = 'snap';

const testNameToKey = (testName, count) =>
testName + ' ' + count;

const keyToTestName = key => {
  if (!/ \d+$/.test(key)) {
    throw new Error('Snapshot keys must end with a number.');
  }

  return key.replace(/ \d+$/, '');
};

const getSnapshotPath = testPath => path.join(
path.join(path.dirname(testPath), '__snapshots__'),
path.basename(testPath) + '.' + SNAPSHOT_EXTENSION);


const getSnapshotData = snapshotPath => {
  const data = Object.create(null);

  if (fileExists(snapshotPath)) {
    try {
      delete require.cache[require.resolve(snapshotPath)];
      /* eslint-disable no-useless-call */
      Object.assign(data, require.call(null, snapshotPath));
      /* eslint-enable no-useless-call */
    } catch (e) {}
  }

  return data;
};

// Extra line breaks at the beginning and at the end of the snapshot are useful
// to make the content of the snapshot easier to read
const addExtraLineBreaks =
string => string.includes('\n') ? `\n${ string }\n` : string;

const serialize = data => {
  return addExtraLineBreaks(prettyFormat(data, {
    escapeRegex: true,
    plugins: getPlugins(),
    printFunctionName: false }));

};

const escape = string => string.replace(/(\`|\${)/g, '\\$1');
const unescape = string => string.replace(/\\(\"|\\|\'|\${)/g, '$1');

const ensureDirectoryExists = filePath => {
  try {
    createDirectory(path.join(path.dirname(filePath)));
  } catch (e) {}
};

const normalizeNewlines =
string => string.replace(/\r\n/g, '\n');

const saveSnapshotFile = (
snapshotData,
snapshotPath) =>
{
  const snapshots = Object.keys(snapshotData).sort(naturalCompare).
  map(key =>
  'exports[`' + escape(key) + '`] = `' +
  normalizeNewlines(escape(snapshotData[key])) + '`;');


  ensureDirectoryExists(snapshotPath);
  fs.writeFileSync(snapshotPath, snapshots.join('\n\n') + '\n');
};

module.exports = {
  SNAPSHOT_EXTENSION,
  ensureDirectoryExists,
  escape,
  getSnapshotData,
  getSnapshotPath,
  keyToTestName,
  saveSnapshotFile,
  serialize,
  testNameToKey,
  unescape };