validateExternalData.js

// Variables and option values must respect NMTOKEN rules so that
// they are compatable with XML export formats
const allowedVariableName = (value) => {
    if (!/^[a-zA-Z0-9._\-:]+$/.test(value)) {
      return 'Not a valid variable name. Only letters, numbers and the symbols ._-: are supported.';
    }
    return undefined;
  };
  
  const getUniqueAttributes = (items) => {
    const uniqueSet = items.reduce(
      (acc, node) => {
        Object.keys(node['attributes'])
          .forEach(key => acc.add(key));
        return acc;
      },
      new Set([]),
    );
  
    return Array.from(uniqueSet);
  };
  
  const getVariableNamesFromNetwork = network =>
    ['nodes', 'edges'].flatMap(
      entity => getUniqueAttributes(network[entity] || []),
    );
  
  const validateNames = (items = []) => {
    const errors = items
      .filter(item => allowedVariableName(item) !== undefined);
  
    if (errors.length === 0) { return false; }
  
    return `Variable name not allowed ("${errors.join('", "')}"). Only letters, numbers and the symbols ._-: are supported.`;
  };
  
  module.exports = { validateNames, getVariableNamesFromNetwork };