LinePatternMatcher

LinePatternMatcher is a flexible Dart package for matching complex patterns across multiple lines of text. It's particularly useful for log analysis, text processing, and pattern recognition tasks.

Features

• Support for multiple pattern types: firstLine, secondLine, lastLine, and sequential
• AND/OR logic for keyword matching using predefined LogicType constants
• Custom pattern definitions using simple Map structures
• JSON serialization and deserialization support
• Pattern visualization functionality
• Efficient processing for large text datasets

Installation

Add this line to your package's pubspec.yaml file:

dependencies:
  line_pattern_matcher: ^1.0.1

Then run:

dart pub get

Usage

Basic Usage

import 'package:line_pattern_matcher/line_pattern_matcher.dart';

void main() {
  final matcher = LinePatternMatcher([
    PatternConfig(
      type: 'firstLine',
      keywords: [['Hello'], ['Hi']],
      logic: LogicType.or
    ),
    PatternConfig(
      type: 'lastLine',
      keywords: [['Goodbye']]
    )
  ]);

  final lines = [
    'Hello, World!',
    'This is a test.',
    'Goodbye!'
  ];

  if (matcher.match(lines)) {
    print('Pattern matched!');
  } else {
    print('Pattern not matched.');
  }
}

Complex Pattern Example

final complexMatcher = LinePatternMatcher([
  PatternConfig(
    type: 'firstLine',
    keywords: [
      ['[User List]'],
      ['[Chat Room]']
    ],
    logic: LogicType.or
  ),
  PatternConfig(
    type: 'secondLine',
    keywords: [
      ['Total Users:', 'Online:']
    ]
  ),
  PatternConfig(
    type: 'sequential',
    keywords: [
      ['Name:', 'Status:'],
      ['Last Seen:']
    ]
  ),
  PatternConfig(
    type: 'lastLine',
    keywords: [
      ['End of List']
    ]
  )
]);

List<String> sampleText = [
  '[User List]',
  'Total Users: 1000, Online: 150',
  'Name: John Doe, Status: Active',
  'Last Seen: 5 minutes ago',
  'Name: Jane Smith, Status: Idle',
  'Last Seen: 1 hour ago',
  'End of List'
];

bool matched = complexMatcher.match(sampleText);
print(matched ? 'Complex pattern matched!' : 'Complex pattern not matched.');

JSON Serialization and Deserialization

String jsonString = matcher.toJson();
LinePatternMatcher deserializedMatcher = LinePatternMatcher.fromJson(jsonString);

Printing Patterns

matcher.printPatterns();
// or
String patternsString = matcher.getPatternsString();
print(patternsString);

Advanced Usage

• Custom Pattern Types: Extend the PatternConfig class to create custom pattern types for specific use cases.
• Performance Optimization: For large text datasets, consider using stream processing or parallel processing to improve efficiency.
• Pattern Composition: Combine multiple LinePatternMatcher instances for more complex text analysis tasks.

Contributing

Contributions are welcome! Please feel free to submit pull requests or create issues to improve this package.

Development Setup

1. Clone the repository
2. Run dart pub get to install dependencies
3. Make your changes
4. Run tests with dart test
5. Submit a pull request with your changes

License

This project is licensed under the MIT License - see the LICENSE file for details.

Changelog

For a detailed changelog, please see the CHANGELOG.md file.

Support

If you encounter any issues or have questions, please file an issue on the GitHub issue tracker.

Libraries

line_pattern_matcher