Function parseField

lib/index.es.js:2882–2901

(fieldName)

// Converts a string in dot notation to an array of its components, with backslash escaping
function parseField(fieldName) {
  // fields may be deep (e.g. "foo.bar.baz"), so parse
  var fields = [];
  var current = '';
  for (var i = 0, len = fieldName.length; i < len; i++) {
    var ch = fieldName[i];
    if (i > 0 && fieldName[i - 1] === '\\' && (ch === '$' || ch === '.')) {
      // escaped delimiter
      current = current.substring(0, current.length - 1) + ch;
    } else if (ch === '.') {
      // When `.` is not escaped (above), it is a field delimiter
      fields.push(current);
      current = '';
    } else { // normal character
      current += ch;
    }
  }
  fields.push(current);
  return fields;
}

var combinationFields = ['$or', '$nor', '$not'];
function isCombinationalField(field) {