imag/libimagutil/src/variants.rs

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2016-01-17 19:08:27 +00:00
/**
* Generate variants of a base value by applying parts
*
* Example:
*
* ```ignore
* generate_variants(path, vec!["foo", "bar", "baz"], |b, v| {
* let b = b.clone();
* b.push(v);
* b
* })
*
* ```
*
*/
pub fn generate_variants<A, B, C, F>(base: A, modders: Vec<B>, f: &F)
-> Vec<C>
where
F: Fn(&A, B) -> C
{
modders.into_iter().map(|m| f(&base, m)).collect()
}
2016-01-18 17:25:43 +00:00
#[cfg(test)]
mod test {
use super::generate_variants;
#[test]
fn test_variants_simple() {
let base = 1;
let vars = vec![0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
let res = generate_variants(base, vars, &|base, var| base + var);
assert!(res.len() == 11, format!("Length is {} instead of 11", res.len()));
assert!(res.iter().all(|i| *i > 0));
assert!(res == vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11])
}
#[test]
fn test_variants_pathes() {
use std::path::PathBuf;
let base = PathBuf::from("/");
let vars = vec!["foo", "bar", "baz"];
let res = generate_variants(base, vars, &|base, var| {
let mut base = base.clone();
base.push(var);
base
});
assert!(res.len() == 3, format!("Length is {} instead of 3", res.len()));
let eq_vec = vec!["/foo", "/bar", "/baz"];
let eq = eq_vec.iter().map(PathBuf::from);
assert!(res.into_iter().zip(eq).all(|(orig, equi)| orig == equi));
}
}