static SourceSpan? _findSpan()

in source_gen/lib/src/type_checker.dart [299:346]

• 46 lines of code
• 5 McCabe index (conditional complexity)

  static SourceSpan? _findSpan(
    Element annotatedElement,
    int annotationIndex,
  ) {
    try {
      final parsedLibrary = annotatedElement.session!
              .getParsedLibraryByElement(annotatedElement.library!)
          as ParsedLibraryResult;
      final declaration = parsedLibrary.getElementDeclaration(annotatedElement);
      if (declaration == null) {
        return null;
      }
      final node = declaration.node;
      final List<Annotation> metadata;
      if (node is AnnotatedNode) {
        metadata = node.metadata;
      } else if (node is FormalParameter) {
        metadata = node.metadata;
      } else {
        throw StateError(
          'Unhandled Annotated AST node type: ${node.runtimeType}',
        );
      }
      final annotation = metadata[annotationIndex];
      final start = annotation.offset;
      final end = start + annotation.length;
      final parsedUnit = declaration.parsedUnit!;
      return SourceSpan(
        SourceLocation(start, sourceUrl: parsedUnit.uri),
        SourceLocation(end, sourceUrl: parsedUnit.uri),
        parsedUnit.content.substring(start, end),
      );
    } catch (e, stack) {
      // Trying to get more information on https://github.com/dart-lang/sdk/issues/45127
      log.warning(
        '''
An unexpected error was thrown trying to get location information on `$annotatedElement` (${annotatedElement.runtimeType}). 

Please file an issue at https://github.com/dart-lang/source_gen/issues/new
Include the contents of this warning and the stack trace along with
the version of `package:source_gen`, `package:analyzer` from `pubspec.lock`.
''',
        e,
        stack,
      );
      return null;
    }
  }