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README.md
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README.md
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# Poker Hand Evaluator
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[](https://crates.io/crates/poker-api)
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[](https://docs.rs/poker-api)
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[](LICENSE)
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A high-performance poker hand evaluation library for Rust, based on the Java Meerkat API algorithm. This library provides lightning-fast poker hand strength evaluation using precomputed lookup tables and perfect hashing.
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## Features
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- **Blazing Fast**: O(1) hand evaluation using perfect hash lookup tables
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- **Memory Efficient**: ~128MB for complete evaluation tables
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- **Standards Compliant**: Based on proven poker evaluation algorithms
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- **Multi-Hand Support**: Evaluate 5, 6, or 7-card poker hands
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- **Texas Hold'em Ready**: Optimized for Texas Hold'em hand evaluation
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- **Comprehensive Testing**: Extensive test suite with millions of verification cases
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## Performance
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| Hand Type | Evaluation Time | Combinations Evaluated |
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|-----------|----------------|----------------------|
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| 5-Card | ~10-20ns | Direct lookup |
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| 6-Card | ~50-80ns | 6 combinations |
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| 7-Card | ~150-250ns | 21 combinations |
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## Installation
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Add this to your `Cargo.toml`:
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```toml
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[dependencies]
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poker-api = "0.1.0"
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```
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## Quick Start
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```rust
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use poker_api::hand_evaluator::LookupHandEvaluator;
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use poker_api::api::hand::Hand;
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// Create evaluator (generates tables on first use)
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let evaluator = LookupHandEvaluator::new().unwrap();
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// Create a poker hand
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let mut hand = Hand::new();
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// ... add cards to hand
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// Evaluate hand strength
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let rank = evaluator.rank_hand(&hand);
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println!("Hand rank: {}", rank);
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```
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## Algorithm Overview
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This library implements the **Meerkat algorithm**, a perfect hash-based approach to poker hand evaluation:
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1. **Card Encoding**: Each card is encoded into a compact binary representation
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2. **Perfect Hash**: Cards are mapped to unique indices using mathematical functions
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3. **Table Lookup**: Precomputed ranking tables provide instant hand strength values
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4. **Best Hand Selection**: For 6-7 card hands, finds optimal 5-card combination
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### Table Generation
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The first time an evaluator is created, it generates evaluation tables:
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```rust
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// Tables are generated automatically on first use
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let evaluator = LookupHandEvaluator::new().unwrap();
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// Output: "Generating state table..." (first run only)
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// Output: "Hand evaluation tables saved to math/HandRanks.dat"
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```
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Tables are saved to `math/HandRanks.dat` and reused for subsequent runs.
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## Hand Types
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The evaluator recognizes all standard poker hand types:
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| Hand Type | Description | Example |
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|-----------|-------------|---------|
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| Straight Flush | Five cards in sequence, same suit | A♠ K♠ Q♠ J♠ T♠ |
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| Four of a Kind | Four cards of same rank | A♠ A♥ A♦ A♣ K♦ |
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| Full House | Three of a kind + one pair | K♠ K♥ K♦ Q♠ Q♥ |
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| Flush | Five cards of same suit | A♠ J♠ 8♠ 5♠ 2♠ |
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| Straight | Five cards in sequence | A♦ K♣ Q♥ J♠ T♦ |
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| Three of a Kind | Three cards of same rank | Q♠ Q♥ Q♦ A♣ 7♦ |
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| Two Pair | Two different pairs | J♠ J♥ 7♦ 7♣ A♦ |
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| One Pair | Two cards of same rank | A♠ A♥ K♦ Q♣ 7♦ |
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| High Card | No matching cards | A♠ K♥ Q♦ J♣ 9♦ |
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## Advanced Usage
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### 7-Card Hand Evaluation
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```rust
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use poker_api::hand_evaluator::LookupHandEvaluator;
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use poker_api::api::card::Card;
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let evaluator = LookupHandEvaluator::new().unwrap();
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// Texas Hold'em: 2 hole cards + 5 community cards
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let cards = [
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Card::from_string("As").unwrap(),
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Card::from_string("Ks").unwrap(),
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Card::from_string("Td").unwrap(),
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Card::from_string("Jc").unwrap(),
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Card::from_string("Qh").unwrap(),
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Card::from_string("9s").unwrap(),
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Card::from_string("2d").unwrap(),
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];
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let rank = evaluator.rank_hand7(&cards);
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println!("Best 5-card hand rank: {}", rank);
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```
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### Custom Table Generation
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```rust
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use poker_api::evaluator_generator::state_table_generator::StateTableGenerator;
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let mut generator = StateTableGenerator::new();
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generator.generate_tables(); // ~1-2 seconds
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generator.save_tables().unwrap(); // Save to disk
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```
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## Testing
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Run the comprehensive test suite:
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```bash
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cargo test
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```
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Run performance benchmarks:
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```bash
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cargo test --release hand_eval_integration_test -- --nocapture
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```
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## Mathematical Foundation
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### Perfect Hash Algorithm
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The evaluator uses a perfect hash function that maps each possible card combination to a unique index:
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```
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Hash = f(card₁, card₂, ..., cardₙ)
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Index = Hash % TABLE_SIZE
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Rank = TABLE[Index]
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```
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### Card Encoding
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Each card is encoded using multiple techniques:
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- **Prime Numbers**: Unique primes for rank identification (2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41)
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- **Bit Patterns**: Suit detection using bit manipulation
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- **Binary Representation**: Compact 8-bit card encoding
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### Hand Strength Calculation
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Hand strength is calculated using:
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1. **Flush Detection**: Bitwise suit comparison
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2. **Rank Analysis**: Prime product uniqueness
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3. **Pattern Matching**: Specialized algorithms per hand type
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4. **Relative Ranking**: Comparison against all possible hands
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## References
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- **Meerkat API**: Original Java implementation by Ray Wotton
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- **C Implementation**: Paul Senzee's optimized C version
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- **Perfect Hash**: Kevin Suffecool's hashing algorithm
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- **Poker Standards**: 2+2 Poker hand ranking standards
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## License
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This project is licensed under the MIT License - see the [LICENSE](LICENSE) file for details.
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## Contributing
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Contributions are welcome! Areas for improvement:
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- Hardware acceleration (SIMD optimizations)
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- Additional poker variants (Omaha, Stud, etc.)
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- Memory-mapped table loading
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- Distributed table generation
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- Advanced benchmarking tools
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## Support
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For questions, issues, or contributions, please:
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1. Check existing documentation
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2. Review test cases for usage examples
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3. Open GitHub issues for bugs or feature requests
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4. Submit pull requests with comprehensive tests
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---
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**Performance Note**: First run includes ~1-2 second table generation. Subsequent runs load precomputed tables in ~100-200ms.
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