# seal
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## Synopsis
A Rust implementation of Needleman-Wunsch & Smith-Waterman sequence alignment.
## Motivation
The aim of this crate is to provide a memory- and time-efficient implementation of Needleman-Wunsch as well as Smith-Waterman sequence alignment using a unified API.
## Getting Started
Add the most recent [version](https://crates.io/crates/seal) of `seal`
to your dependencies in your project's `Cargo.toml`.
Then add …
```rust
extern crate seal;
```
… to your crate's root file (e.g. `lib.rs`, `main.rs`).
Once that's done you're ready to play!
## Example
```rust
extern crate seal;
use seal::pair::{
Alignment, AlignmentSet, InMemoryAlignmentMatrix, NeedlemanWunsch, SmithWaterman, Step,
};
fn main() {
let str_x = "The quick brown fox jumps over the lazy dog.";
let str_y = "The brown dog jumps over the very lazy snail.";
let strategy = NeedlemanWunsch::new(1, -1, -1, -1);
// Alternatively:
// let strategy = SmithWaterman::new(2, -1, -1, -1);
let sequence_x: Vec<char> = str_x.chars().collect();
let sequence_y: Vec<char> = str_y.chars().collect();
let set: AlignmentSet<InMemoryAlignmentMatrix> =
AlignmentSet::new(sequence_x.len(), sequence_y.len(), strategy, |x, y| {
sequence_x[x] == sequence_y[y]
})
.unwrap();
let print_alignment = |alignment: Alignment| {
for step in alignment.steps() {
match step {
Step::Align { x, y } => {
if sequence_x[x] == sequence_y[y] {
print!("=")
} else {
print!("!")
}
}
Step::Delete { .. } => print!("-"),
Step::Insert { .. } => print!("+"),
}
}
println!("\n");
};
println!("Local alignment:");
let local_alignment = set.local_alignment();
print_alignment(local_alignment);
println!("Global alignment:");
let global_alignment = set.global_alignment();
print_alignment(global_alignment);
// Local alignment:
// ====------======!=!================+++++=====
//
// Global alignment:
// ====------======!=!================+++++=====!!!++=
}
```
See the [examples directory](examples) for more in-depth examples.
## API Reference
An `AlignmentSet` contains all optimal alignments for a given pair of sequences.
### Retrieving a single locally/globally optimal alignment
```rust
let alignment in alignment_set.local_alignment();
let alignment in alignment_set.global_alignment();
```
### Enumerate all locally/globally optimal alignments
```rust
for alignment in alignment_set.local_alignments() {
// …
}
for alignment in alignment_set.global_alignments() {
// …
}
```
## Contributing
Please read [CONTRIBUTING.md](CONTRIBUTING.md) for details on our [code of conduct](https://www.rust-lang.org/conduct.html),
and the process for submitting pull requests to us.
## License
This project is licensed under the [**MPL-2.0**](https://www.tldrlegal.com/l/mpl-2.0) – see the [LICENSE.md](LICENSE.md) file for details.