decode method

String decode(String input)

Decodes a string, resolving all possible entities.

Implementation

String decode(String input) {
  // If we obviously have no entities, return the input string.
  var start = input.indexOf(XmlToken.entityStart, 0);
  if (start < 0) return input;
  // Otherwise traverse the input and decode all entities.
  final buffer = StringBuffer(input.substring(0, start));
  while (true) {
    final index = input.indexOf(XmlToken.entityEnd, start + 1);
    if (start + 1 < index) {
      final entity = input.substring(start + 1, index);
      final value = decodeEntity(entity);
      if (value != null) {
        // Valid entity found, write the transformed value.
        buffer.write(value);
        start = index + 1;
      } else {
        buffer.write(XmlToken.entityStart);
        start++;
      }
    } else {
      buffer.write(XmlToken.entityStart);
      start++;
    }
    // Find the next possible start position of an entity.
    final next = input.indexOf(XmlToken.entityStart, start);
    if (next == -1) {
      // Reached the end of the input.
      buffer.write(input.substring(start));
      break;
    }
    buffer.write(input.substring(start, next));
    start = next;
  }
  return buffer.toString();
}