dicomweb-client/src/utils.js

Implementation of DICOMweb client code

function findSubstring(str, before, after) {
  const beforeIndex = str.lastIndexOf(before) + before.length;
  if (beforeIndex < before.length) {
    return null;
  }
  if (after !== undefined) {
    const afterIndex = str.lastIndexOf(after);
    if (afterIndex < 0) {
      return null;
    }
    return str.substring(beforeIndex, afterIndex);
  }
  return str.substring(beforeIndex);
}

function getStudyInstanceUIDFromUri(uri) {
  let uid = findSubstring(uri, 'studies/', '/series');
  if (!uid) {
    uid = findSubstring(uri, 'studies/');
  }
  if (!uid) {
    console.debug(
      `Study Instance UID could not be dertermined from URI "${uri}"`,
    );
  }
  return uid;
}

function getSeriesInstanceUIDFromUri(uri) {
  let uid = findSubstring(uri, 'series/', '/instances');
  if (!uid) {
    uid = findSubstring(uri, 'series/');
  }
  if (!uid) {
    console.debug(
      `Series Instance UID could not be dertermined from URI "${uri}"`,
    );
  }
  return uid;
}

function getSOPInstanceUIDFromUri(uri) {
  let uid = findSubstring(uri, '/instances/', '/frames');
  if (!uid) {
    uid = findSubstring(uri, '/instances/', '/metadata');
  }
  if (!uid) {
    uid = findSubstring(uri, '/instances/');
  }
  if (!uid) {
    console.debug(`SOP Instance UID could not be dertermined from URI"${uri}"`);
  }
  return uid;
}


function getFrameNumbersFromUri(uri) {
  let numbers = findSubstring(uri, '/frames/', '/rendered');
  if (!numbers) {
    numbers = findSubstring(uri, '/frames/');
  }
  if (numbers === undefined) {
    console.debug(`Frame Numbers could not be dertermined from URI"${uri}"`);
  }
  return numbers.split(',');
}

export {
  getStudyInstanceUIDFromUri,
  getSeriesInstanceUIDFromUri,
  getSOPInstanceUIDFromUri,
  getFrameNumbersFromUri,
};