itk/readPolyDataLocalFileSync.js

High performance spatial analysis in a JavaScript runtime environment.

var path = require('path');

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

var fs = require('fs');

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

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

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

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

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

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

var readPolyDataLocalFileSync = function readPolyDataLocalFileSync(filePath) {
  var polyDataIOsPath = path.resolve(__dirname, 'PolyDataIOs');
  var absoluteFilePath = path.resolve(filePath);
  var filePathBasename = path.basename(filePath);
  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);
  }

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

  var modulePath = path.join(polyDataIOsPath, io);
  var Module = loadEmscriptenModule(modulePath);
  var fileContents = new Uint8Array(fs.readFileSync(absoluteFilePath));
  var args = [filePathBasename, filePathBasename + '.output.json'];
  var desiredOutputs = [{
    path: args[1],
    type: IOTypes.vtkPolyData
  }];
  var inputs = [{
    path: args[0],
    type: IOTypes.Binary,
    data: fileContents
  }];

  var _runPipelineEmscripte = runPipelineEmscripten(Module, args, desiredOutputs, inputs),
      outputs = _runPipelineEmscripte.outputs;

  return outputs[0].data;
};

module.exports = readPolyDataLocalFileSync;