operator []= method

void operator []=(
  1. String attributeName,
  2. dynamic rawValue

When we create these from strings or from AST nodes, we want to look up and set their attributes by string names, so we override the indexing operators so that they behave like maps with respect to those attribute names.


void operator []=(String attributeName, rawValue) {
  var value = Message.from(rawValue, this);
  if (validSelectKey.stringMatch(attributeName) == attributeName) {
    cases[attributeName] = value;
  } else {
    throw new IntlMessageExtractionException(
        "Invalid select keyword: '$attributeName', must "
        "match '$selectPattern'");