itk/readMeshLocalFile.js

High performance spatial analysis in a JavaScript runtime environment.

var path = require('path');

var mime = require('mime-types');

var mimeToIO = require('./MimeToMeshIO.js');

var getFileExtension = require('./getFileExtension.js');

var extensionToIO = require('./extensionToMeshIO.js');

var MeshIOIndex = require('./MeshIOIndex.js');

var loadEmscriptenModule = require('./loadEmscriptenModuleNode.js');

var readMeshEmscriptenFSFile = require('./readMeshEmscriptenFSFile.js');

var readMeshLocalFile = function readMeshLocalFile(filePath) {
  return new Promise(function (resolve, reject) {
    var meshIOsPath = path.resolve(__dirname, 'MeshIOs');
    var absoluteFilePath = path.resolve(filePath);

    try {
      var mimeType = mime.lookup(absoluteFilePath);
      var extension = getFileExtension(absoluteFilePath);
      var io = null;

      if (mimeToIO.has(mimeType)) {
        io = mimeToIO.get(mimeType);
      } else if (extensionToIO.has(extension)) {
        io = extensionToIO.get(extension);
      } else {
        for (var idx = 0; idx < MeshIOIndex.length; ++idx) {
          var _modulePath = path.join(meshIOsPath, MeshIOIndex[idx]);

          var _Module = loadEmscriptenModule(_modulePath);

          var meshIO = new _Module.ITKMeshIO();

          var _mountedFilePath = _Module.mountContainingDirectory(absoluteFilePath);

          meshIO.SetFileName(_mountedFilePath);

          if (meshIO.CanReadFile(_mountedFilePath)) {
            io = MeshIOIndex[idx];

            _Module.unmountContainingDirectory(_mountedFilePath);

            break;
          }

          _Module.unmountContainingDirectory(_mountedFilePath);
        }
      }

      if (io === null) {
        reject(Error('Could not find IO for: ' + absoluteFilePath));
      }

      var modulePath = path.join(meshIOsPath, io);
      var Module = loadEmscriptenModule(modulePath);
      var mountedFilePath = Module.mountContainingDirectory(absoluteFilePath);
      var mesh = readMeshEmscriptenFSFile(Module, mountedFilePath);
      Module.unmountContainingDirectory(mountedFilePath);
      resolve(mesh);
    } catch (err) {
      reject(err);
    }
  });
};

module.exports = readMeshLocalFile;