add method

void add(EasyAttribute<Object?> attribute)

Adds the attribute to the current style map.

If the attribute is an exclusive, it will remove any other one that is also an exclusive.

Implementation

void add(EasyAttribute attribute) {
  if (attribute.exclusive && attribute.value != null) {
    bool hasExclusive = true;
    // search first the knowed exclusive attributes
    for (final EasyAttribute<Object?> exclusive
        in EasyAttribute.exclusivesExceptHeader.values) {
      if (attributes.containsKey(exclusive.key) &&
          !exclusive.canMergeWith(attribute)) {
        attributes.remove(exclusive.key);
        hasExclusive = false;
        break;
      }
    }

    if (hasExclusive) {
      for (String key in attributes.keys) {
        final EasyAttribute<Object?>? value = attributes[key];
        assert(value != null,
            'value must be non null since is registered in ${toJson()}');
        if (value!.exclusive && !value.canMergeWith(attribute)) {
          attributes.remove(key);
          break;
        }
      }
    }
  }
  attribute.value == null
      ? remove(attribute.key)
      : attributes[attribute.key] = attribute;
}