Anabaena

L-System (Lindenmayer system) for Rust.

Features

• Generic L-System alphabet
• Support for stochastic grammars
• Support for context sensitive grammars
• Support for parametric grammars
• Mutable context support during individual production rules, and summarized after a round is complete
• Streaming iterator implementation

Examples

Algae

Taken from the Wikipedia article on L-Systems, the following is an implementation of the algae example:

```rust use anabaena::{LSystem, LRulesHash, LRulesSet, Total}; use std::collections::HashMap; use streaming_iterator::StreamingIterator;

let rules: LRulesHash<(), char, LRulesSet> = |_| HashMap::from([ ( 'A', LRulesSet::new(vec![ (1, vec!['A', 'B']), ]), ), ( 'B', LRulesSet::new(vec![ (1, vec!['A']), ]), ) ]);

let axiom: Vec = vec!['A'];

let mut lsystem: LSystem<_,_,_, Total> = LSystem::new( axiom, rules, );

asserteq!(lsystem.next(), Some(&"AB".chars().collect())); asserteq!(lsystem.next(), Some(&"ABA".chars().collect())); asserteq!(lsystem.next(), Some(&"ABAAB".chars().collect())); asserteq!(lsystem.next(), Some(&"ABAABABA".chars().collect())); asserteq!(lsystem.next(), Some(&"ABAABABAABAAB".chars().collect())); asserteq!(lsystem.next(), Some(&"ABAABABAABAABABAABABA".chars().collect())); assert_eq!(lsystem.next(), Some(&"ABAABABAABAABABAABABAABAABABAABAAB".chars().collect())); ```

Examples with Turtle.rs

Most of the other examples in the Wikipedia article are implemented in the examples/ folder, which use the turtle.rs library to render the results. You can run the B-Tree example, for instance, with the following command:

bash cargo run --example btree