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use crate::lattice::Lattice;
use std::collections::HashSet;
use std::collections::VecDeque;
pub struct LatticeKMP<'a> {
pattern: Vec<&'a str>,
cpattern: Vec<usize>,
}
impl<'a> LatticeKMP<'a> {
/// Returns LatticeKMP with the given pattern.
///
/// # Arguments
///
/// * `pattern` - A word array
///
/// # Example
///
/// ```
/// use parattice::LatticeKMP;
///
/// let pattern = vec!["幹", "細胞"];
/// let kmp = LatticeKMP::new(pattern);
/// ```
pub fn new(pattern: Vec<&'a str>) -> LatticeKMP<'a> {
let mut cpattern = vec![0];
let mut j;
for i in 1..pattern.len() {
j = cpattern[i - 1];
while j > 0 && pattern[j] != pattern[i] {
j = cpattern[j - 1];
}
cpattern.push(j + if pattern[j] == pattern[i] { 1 } else { 0 });
}
LatticeKMP {
pattern,
cpattern,
}
}
/// Returns paths of found patterns.
///
/// # Arguments
///
/// * `lattice` - A lattice
///
/// # Example
///
/// ```
/// use parattice::PaRattice;
/// use parattice::Lattice;
/// use parattice::LatticeKMP;
///
/// let pattern = vec!["幹", "細胞"];
/// let kmp = LatticeKMP::new(pattern);
///
/// let paradict = vec![
/// vec![
/// vec!["blood", "stem", "cell"],
/// vec!["造血", "幹", "細胞"],
/// vec!["hematopoietic", "stem", "cell"],
/// ],
/// vec![
/// vec!["造血", "幹", "細胞", "移植"],
/// vec!["hematopoietic", "stem", "cell", "transplantation"],
/// ],
/// vec![vec!["stem", "cell"], vec!["幹", "細胞"]],
/// vec![
/// vec!["幹", "細胞", "移植"],
/// vec!["rescue", "transplant"],
/// vec!["stem", "cell", "rescue"],
/// ],
/// vec![vec!["rescue"], vec!["救命"]],
/// vec![vec!["blood"], vec!["血液"]],
/// ];
/// let parattice = PaRattice::new(paradict);
/// let words = vec!["造血", "幹", "細胞", "移植"];
/// let lattice = parattice.get_lattice(&words, true, 2);
///
/// let results = kmp.search(&lattice);
/// ```
pub fn search(&self, lattice: &'a Lattice) -> Vec<Vec<(&'a str, usize)>> {
let mut added_candidates = HashSet::new();
let mut queue = VecDeque::new();
let mut candidates = VecDeque::new();
let mut results = vec![];
queue.push_back((0, 0));
candidates.push_back(VecDeque::new());
candidates[0].push_back(("", 0));
while let Some(item) = queue.pop_front() {
let candidate = candidates.pop_front().unwrap();
if lattice.lattice[item.0].forward_main.is_none() {
continue;
}
for edge in &lattice.lattice[item.0].forwards {
let mut j = item.1;
while j > 0 && edge.0 != self.pattern[j] {
j = self.cpattern[j - 1];
}
if edge.0 == self.pattern[j] {
j += 1;
}
let mut new_candidate = VecDeque::new();
new_candidate.push_back(*edge);
let mut k = candidate.len();
while new_candidate.len() < j {
k -= 1;
new_candidate.push_front(candidate[k]);
}
new_candidate.push_front(("", candidate[k - 1].1));
if j == self.pattern.len() {
results.push(new_candidate.clone().into_iter().collect());
j = self.cpattern[j - 1];
while new_candidate.len() > j + 1 {
new_candidate.pop_front();
}
}
if !added_candidates.contains(&new_candidate) {
added_candidates.insert(new_candidate.clone());
queue.push_back((edge.1, j));
candidates.push_back(new_candidate);
}
}
}
results
}
}