# Crate alcs [−] [src]

Implementation of An all-substrings common subsequence algorithm

Given two strings s1 and s2, it is possible construct, in O(|s1|*|s2|) time and O(|s1|+|s2|) space, a structure that can be queried to find the length of all Longest Common Subsequences between s1 and all possible substrings of s2, each query requiring constant time.

Some accessor functions are provided to retrieve the matrices and the vectors defined in the paper

# Example

```extern crate alcs;
use alcs::Alcs;

fn main() {
let a = "word";
let b = "hello world";
let va = a.chars().collect::<Vec<char>>();
let vb = b.chars().collect::<Vec<char>>();
let alcs = Alcs::new(&va, &vb);
for i in 0..b.len() {
for (i, j, cij) in alcs.suffix(i) {
println!(r#"LCS between "{}" and "{}" has length {}"#,a,&b[i..j],cij);
}
}
}```

Output:

```LCS between "word" and "h" has length 0
LCS between "word" and "he" has length 0
LCS between "word" and "hel" has length 0
...
LCS between "word" and " world" has length 4
LCS between "word" and "w" has length 1
LCS between "word" and "wo" has length 2
LCS between "word" and "wor" has length 3
...
LCS between "word" and "d" has length 1
```

Also, it is defined a trait that allows to fuzzy search a string:

```extern crate alcs;
use alcs::FuzzyStrstr;

fn main() {
let tsh = 0.7;
let tests = [
("he.llo.wor.ld.!", "world"),
("he.llo.word", "world"),
("hello world", "word"),
("hello world", "banana"),
];
for &(h, n) in &tests {
match h.fuzzy_find_str(n, tsh) {
None => {
println!(r#""{}" does not contain "{}""#, h, n);
}
Some((score, sub)) => {
println!(r#""{}" contains "{}" ("{}") with score {}"#, h, n, sub, score);
}
}
}
}
```

Output:

```"he.llo.wor.ld.!" contains "world" ("wor.ld") with score 0.8333333
"he.llo.word" contains "world" ("word") with score 0.8
"hello world" contains "word" ("world") with score 0.8
"hello world" does not contain "banana"
```

## Structs

 Alcs AlcsIterator

## Functions

 alcs Constructs the vectors IG, VG, DG0 alcs_mat Constructs the matrices ih, iv, and the vectors IG, VG, DG0 compute_ig_vg_dg_from_ih_mat Constructs the vectors DG0 and VG using the matrix ih compute_mat_ih_iv Constructs the full matrices i_h and i_v compute_vec_ig Constructs the vector IG compute_vg_dg_from_ig Constructs the vectors DG0 and VG using IG