search term regex from the gods

search-term-parse.js

// Beautiful regex patterns that parse and validate complex querystring parameter of search terms
const searchSyntaxValidationRegex = /^([^:]+:[^:]+(?:,|$))+$/;
const searchSyntaxParseRegex = /([^:]+):\(([^(]+)\)(?:,|$)/g;

/**
 * Parses comma separated list of key values into an object.
 *
 * IN:
 * title:(bar bar),content_stripped:(baz, and qux),other:(beep boop)
 *
 * OUT:
 * { title: 'bar bar', content_stripped: 'baz, and qux', other: 'beep boop' }
 *
 * @param {string} str
 *
 * @returns {object}
 */
function searchTermStringToObject(str) {
  const obj = {};

  if (!str) {
    return obj;
  }

  let match;
  while ((match = searchSyntaxParseRegex.exec(str))) {
    // match[1] is key, match[2] is value
    obj[match[1]] = match[2];
  }

  return obj;
}

/**
 * Parses comma separated list of key values into a collection of query objects with the given type.
 *
 * IN:
 * queryType = 'match'
 * str = title:(bar bar),content_stripped:(baz, and qux),other:(beep boop)
 *
 * OUT:
 * [
 *   { match: { title: 'bar bar' } },
 *   { match: { content_stripped: 'baz, and qux' } },
 *   { match: { other: 'beep boop' } }
 * ]
 *
 * @param {string} queryType
 * @param {string} str
 *
 * @returns {array}
 */
function searchTermToQueryCollection(queryType, str = '') {
  const collection = [];

  let match;
  while ((match = searchSyntaxParseRegex.exec(str))) {
    const key = match[1];
    const value = match[2];
    collection.push({ [queryType]: { [key]: value } });
  }

  return collection;
}