data-provider-temporary/examples/node_modules/jest-haste-map/build/crawlers/node.js

Library that helps with server-to-client synchronization of data

'use strict'; /**
               * 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.
               *
               * 
               */




const fs = require('fs');
const path = require('path');var _require =
require('child_process');const spawn = _require.spawn;

const H = require('../constants');



function find(
roots,
extensions,
ignore,
callback)
{
  const result = [];
  let activeCalls = 0;

  function search(directory) {
    activeCalls++;
    fs.readdir(directory, (err, names) => {
      activeCalls--;

      names.forEach(file => {
        file = path.join(directory, file);
        if (ignore(file)) {
          return;
        }
        activeCalls++;

        fs.lstat(file, (err, stat) => {
          activeCalls--;

          if (!err && stat && !stat.isSymbolicLink()) {
            if (stat.isDirectory()) {
              search(file);
            } else {
              const ext = path.extname(file).substr(1);
              if (extensions.indexOf(ext) !== -1) {
                result.push([file, stat.mtime.getTime()]);
              }
            }
          }
          if (activeCalls === 0) {
            callback(result);
          }
        });
      });

      if (activeCalls === 0) {
        callback(result);
      }
    });
  }

  roots.forEach(search);
}

function findNative(
roots,
extensions,
ignore,
callback)
{
  const args = [].concat(roots);
  args.push('-type', 'f');
  if (extensions.length) {
    args.push('\(');
  }
  extensions.forEach((ext, index) => {
    if (index) {
      args.push('-o');
    }
    args.push('-iname');
    args.push('*.' + ext);
  });
  if (extensions.length) {
    args.push('\)');
  }

  const child = spawn('find', args);
  let stdout = '';
  child.stdout.setEncoding('utf-8');
  child.stdout.on('data', data => stdout += data);

  child.stdout.on('close', () => {
    const lines = stdout.trim().split('\n').filter(x => !ignore(x));
    const result = [];
    let count = lines.length;
    if (!count) {
      callback([]);
    } else {
      lines.forEach(path => {
        fs.stat(path, (err, stat) => {
          if (!err && stat) {
            result.push([path, stat.mtime.getTime()]);
          }
          if (--count === 0) {
            callback(result);
          }
        });
      });
    }
  });
}

module.exports = function nodeCrawl(
options)
{const
  data = options.data,extensions = options.extensions,forceNodeFilesystemAPI = options.forceNodeFilesystemAPI,ignore = options.ignore,roots = options.roots;

  return new Promise(resolve => {
    const callback = list => {
      const files = Object.create(null);
      list.forEach(fileData => {
        const name = fileData[0];
        const mtime = fileData[1];
        const existingFile = data.files[name];
        if (existingFile && existingFile[H.MTIME] === mtime) {
          files[name] = existingFile;
        } else {
          // See ../constants.js
          files[name] = ['', mtime, 0, []];
        }
      });
      data.files = files;
      resolve(data);
    };

    if (forceNodeFilesystemAPI || process.platform === 'win32') {
      find(roots, extensions, ignore, callback);
    } else {
      findNative(roots, extensions, ignore, callback);
    }
  });
};