Fltrs

Fltrs want to support creating easy, fast and expandable filters for iterable things (like Vec, Array, Map, Set, ...) in rust. A filter is created based on an input string (query). This has particular advantages if the filter is created at runtime, i.e. in a GUI or command line tool (CLI).

```rust use fltrs::query;

asserteq!( 5, [3, 2, 1, 4, 5, 7, 5, 4, 3] .intoiter() .filter(query("> 1 and < 5").unwrap()) .count() ); ```

Fltrs supported queries on structs too. This is possible, if the struct implement the trait: fltrs::PathResolver.

```rust use fltrs::{PathResolver, Filterable, query};

struct Point { name: &'static str, x: i32, y: i32, }

impl PathResolver for Point { fn pathtoindex(path: &str) -> Option { match path { "name" => Some(0), "x" => Some(1), "y" => Some(2), _ => None, } }

fn value(&self, idx: usize) -> &dyn Filterable {
    match idx {
        0 => &self.name,
        1 => &self.x,
        _ => &self.y,
    }
}

}

asserteq!( 1, [ Point { name: "Point13", x: 1, y: 3}, Point { name: "Point23", x: 2, y: 3}, Point { name: "Point26", x: 2, y: 6}, ] .intoiter() .filter(query(r#"name starts_with "Point" and x > 1 and y < 5"#).unwrap()) .count() ); ```