addDirective method

Implementation

@override
void addDirective(Asset src, DirectiveStatement statement) {
  assert(assets.containsKey(src.id));
  final String directiveSrcId = addAsset(statement.asset);
  final List<List<dynamic>> srcDirectives = directives[src.id] ?? <List<dynamic>>[];
  if (srcDirectives.isNotEmpty) {
    for (final List<dynamic> directive in srcDirectives) {
      final int directiveType = directive[GraphIndex.directiveType];

      /// return early if the directive is already present
      if (directiveType == DirectiveStatement.part &&
          statement.type == DirectiveStatement.partOf &&
          directive[GraphIndex.directiveSrc] == statement.asset.id) {
        return;
      }

      final List<dynamic>? shows = directive[GraphIndex.directiveShow];
      final List<dynamic>? hides = directive[GraphIndex.directiveHide];
      final String? prefix = directive.elementAtOrNull(
        GraphIndex.directivePrefix,
      );
      if (directive[GraphIndex.directiveSrc] == directiveSrcId &&
          directiveType == statement.type &&
          prefix == statement.prefix &&
          _listEquals(shows, statement.show) &&
          _listEquals(hides, statement.hide)) {
        return;
      }
    }
  }
  srcDirectives.add(<dynamic>[
    statement.type,
    directiveSrcId,
    statement.stringUri,
    statement.show.isEmpty ? null : statement.show,
    statement.hide.isEmpty ? null : statement.hide,
    if (statement.prefix != null) statement.prefix,
    if (statement.deferred) 1,
  ]);
  directives[src.id] = srcDirectives;
}