A [miniKanren]-family relational logic programming language embedded in Rust.
In addition to core miniKanren language, proto-vulcan currently provides support for: * Disequality constraints CLP(Tree) * Finite-domain constraints CLP(FD) * Various operators: anyo, conda, condu, onceo, project * Pattern matching: matche, matcha, matchu * Writing goals in Rust embedded inline within proto-vulcan * User extension interface
The language is embedded into Rust with macros which parse the language syntax and convert it into Rust.
```rust extern crate protovulcan; use protovulcan::*;
fn main() { let query = protovulcanquery!(|q| { conde { q == 1, q == 2, q == 3, } });
for result in query.run() {
println!("q = {}", result.q);
}
}
The example program produces three solutions:
text
q = 1
q = 2
q = 3
```
New relations can be defined as Rust-functions using proto_vulcan! and
proto_vulcan_closure!-macros. Expressions within proto_vulcan! are
evaluated immediately, whereas expressions within proto_vulcan_closure!
are stored into a closure and evaluated later. Recursive relations must
use the latter variant.
```rust
use proto_vulcan::*;
pub fn appendo(l: LTerm, s: LTerm, ls: LTerm) -> Goal { protovulcanclosure!( match [l, s, ls] { [[], x, x] => , [[x | l1], l2, [x | l3]] => appendo(l1, l2, l3), } ) } ``` More examples in documentation.
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