Map _createSegments()

in tool/codeviewer_cli/segment_generator.dart [76:215]
103 lines of code
21 McCabe index (conditional complexity)

Map<String, String> _createSegments(String sourceDirectoryPath) {
  final files = Directory(sourceDirectoryPath)
      .listSync(recursive: true)
      .whereType<File>()
      .toList();

  var subsegments = <String, StringBuffer>{};
  var subsegmentPrologues = <String, String>{};

  var appearedSubsegments = <String>{};

  for (final file in files) {
    // Process file.

    final content = file.readAsStringSync();
    final lines = const LineSplitter().convert(content);

    var status = _FileReadStatus.comments;

    final prologue = StringBuffer();

    final activeSubsegments = <String>{};

    for (final line in lines) {
      // Update status.

      status = _updatedStatus(status, line);

      if (status != _FileReadStatus.finished) {
        prologue.writeln(line);
      }

      // Process run commands.

      if (line.trim().startsWith(beginSubsegment)) {
        final argumentString = line.replaceFirst(beginSubsegment, '').trim();
        var arguments = argumentString.isEmpty
            ? <String>[]
            : argumentString.split(RegExp(r'\s+'));

        for (final argument in arguments) {
          if (activeSubsegments.contains(argument)) {
            throw PreformatterException(
                'BEGIN $argument is used twice in file ${file.path}');
          } else if (appearedSubsegments.contains(argument)) {
            throw PreformatterException('BEGIN $argument is used twice');
          } else {
            activeSubsegments.add(argument);
            appearedSubsegments.add(argument);
            subsegments[argument] = StringBuffer();
            subsegmentPrologues[argument] = prologue.toString();
          }
        }
      } else if (line.trim().startsWith(endSubsegment)) {
        final argumentString = line.replaceFirst(endSubsegment, '').trim();
        final arguments = argumentString.isEmpty
            ? <String>[]
            : argumentString.split(RegExp(r'\s+'));

        if (arguments.isEmpty && activeSubsegments.length == 1) {
          arguments.add(activeSubsegments.first);
        }

        for (final argument in arguments) {
          if (activeSubsegments.contains(argument)) {
            activeSubsegments.remove(argument);
          } else {
            throw PreformatterException(
                'END $argument is used without a paired BEGIN in ${file.path}');
          }
        }
      } else {
        // Simple line.

        for (final name in activeSubsegments) {
          subsegments[name].writeln(line);
        }
      }
    }

    if (activeSubsegments.isNotEmpty) {
      throw PreformatterException('File ${file.path} has unpaired BEGIN');
    }
  }

  var segments = <String, List<TaggedString>>{};
  var segmentPrologues = <String, String>{};

  // Sometimes a code segment is made up of subsegments. They are marked by
  // names with a "#" symbol in it, such as "bottomSheetDemoModal#1" and
  // "bottomSheetDemoModal#2".
  // The following code groups the subsegments by order into segments.
  subsegments.forEach((key, value) {
    String name;
    double order;

    if (key.contains('#')) {
      var parts = key.split('#');
      name = parts[0];
      order = double.parse(parts[1]);
    } else {
      name = key;
      order = 0;
    }

    if (!segments.containsKey(name)) {
      segments[name] = [];
    }
    segments[name].add(
      TaggedString(
        text: value.toString(),
        order: order,
      ),
    );

    segmentPrologues[name] = subsegmentPrologues[key];
  });

  segments.forEach((key, value) {
    value.sort((ts1, ts2) => (ts1.order - ts2.order).sign.round());
  });

  var answer = <String, String>{};

  for (final name in segments.keys) {
    final buffer = StringBuffer();

    buffer.write(segmentPrologues[name].trim());
    buffer.write('\n\n');

    for (final ts in segments[name]) {
      buffer.write(ts.text.trim());
      buffer.write('\n\n');
    }

    answer[name] = buffer.toString();
  }

  return answer;
}