Struct Levenshtein 

pub struct Levenshtein { /* private fields */ }

Holds custom weights for substitutions and insertion/deletion

Examples

• One substitution is equivalent to an insertion and a deletion:

let lev = Levenshtein::new (1, 2);
// Substitute 'x' for 'b' -> cost = 2
assert_eq!(lev.distance ("abc", "axc"), 2);
// Insert 'x' and delete 'c' -> cost = 1+1 = 2
assert_eq!(lev.distance ("abc", "xab"), 2);

• Have substitutions cost slightly more than insertions and deletions (but still less than a deletion followed by an insertion):

let lev = Levenshtein::new (2, 3);
// Substitute 'x' for 'b' -> cost = 3
assert_eq!(lev.distance ("abc", "axc"), 3);
// Insert 'x' and delete 'c' -> cost = 2+2 = 4
assert_eq!(lev.distance ("abc", "xab"), 4);

Implementations

impl Levenshtein

pub fn new(addrm_weight: usize, subst_weight: usize) -> Self

Create a Levenshtein instance holding custom weights.

Arguments

• addrm_weight Weight to use for insertions and deletions.
• subst_weight Weight to use for substitutions.

pub fn distance<T: PartialEq, U: AsRef<[T]>>(&self, a: U, b: U) -> usize

Compute the Levenshtein distance between two sequences using the stored custom weights.

Trait Implementations

impl Default for Levenshtein

fn default() -> Self

Returns the “default value” for a type.