merge method

Implementation

@override
void merge(ScanResults results) {
  for (final MapEntry<String, List<dynamic>> asset in results.assets.entries) {
    if (assets[asset.key]?[GraphIndex.assetDigest] == null) {
      assets[asset.key] = asset.value;
    }
  }
  // [type, src, stringUri, show, hide, prefix?, deferred?]]
  for (final MapEntry<String, List<List<dynamic>>> directive in results.directives.entries) {
    if (!directives.containsKey(directive.key)) {
      directives[directive.key] = directive.value;
    } else {
      final List<List<dynamic>> newDirectives = directive.value;
      final List<List<dynamic>> allDirections = List<List<dynamic>>.of(
        directives[directive.key]!,
      );
      for (final List<dynamic> newDir in newDirectives) {
        bool isDuplicate = false;
        for (final List<dynamic> exDir in allDirections) {
          final bool hasNameCombinator =
              (newDir[GraphIndex.directiveType] == DirectiveStatement.export ||
              newDir[GraphIndex.directiveType] == DirectiveStatement.import);

          if (newDir[GraphIndex.directiveType] == exDir[GraphIndex.directiveType] &&
              newDir[GraphIndex.directiveSrc] == exDir[GraphIndex.directiveSrc] &&
              (!hasNameCombinator ||
                  (_listEquals(
                        newDir[GraphIndex.directiveShow],
                        exDir[GraphIndex.directiveShow],
                      ) &&
                      _listEquals(
                        newDir[GraphIndex.directiveHide],
                        exDir[GraphIndex.directiveHide],
                      ) &&
                      newDir.elementAtOrNull(GraphIndex.directivePrefix) ==
                          exDir.elementAtOrNull(
                            GraphIndex.directivePrefix,
                          )))) {
            isDuplicate = true;
            break;
          }
        }
        // If the directive already exists, skip adding it
        if (!isDuplicate) {
          allDirections.add(newDir);
        }
      }
      directives[directive.key] = allDirections;
    }
  }
  identifiers.addAll(results.identifiers);
}