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use std::collections::HashMap;
use std::hash::Hash;
use std::fs::File;
use std::io::BufWriter;
use std::thread;
use walkdir::*;
use hash32::Hasher;
use crate::vector::{FileVector, Indexer, Count};
use crate::filecache::FileCache;
use crate::searchresult::SearchResult;
use crate::text;
use crate::splitter;
use crate::vector;
/// Represents a Index which is ether generated
/// or read from a file.
#[derive(Clone, Debug)]
pub struct Index {
filecache : Vec<FileCache>,
}
impl Default for Index {
fn default() -> Self {
Self::empty()
}
}
#[derive(Clone, Debug, Default, Copy)]
pub enum GenState {
#[default]
Fetching,
Parsing,
Merging
}
impl Index {
pub fn empty() -> Self {
Self {
filecache : Vec::new()
}
}
pub fn generate(input_path : &str, callback : impl Fn(GenState, u8)) -> Self {
let mut nof : usize = 0;
let num_threads = thread::available_parallelism().unwrap().get();
let mut paths = Vec::new();
let (result_tx, result_rx) = std::sync::mpsc::channel();
callback(GenState::Fetching, 0);
for entry in WalkDir::new(input_path)
.into_iter()
.filter_map(|e| e.ok()) {
if entry.path().is_file() {
nof += 1;
paths.push(entry.path().to_str().unwrap().to_string());
}
}
callback(GenState::Fetching, 100);
let chunks = paths.chunks(paths.len() / num_threads);
let mut filecache = Vec::with_capacity(nof);
thread::scope(|s| {
for chunk in chunks {
let result_tx = result_tx.clone();
s.spawn(move || {
for path in chunk {
let content : String = text::extract_text(path);
if content.is_empty() {
result_tx.send(FileCache {
path: "".to_string(),
vector : FileVector::default()
}).ok();
continue;
}
let words : Vec<String> = splitter::split_to_words(content);
let fv = FileVector::from_words(words);
result_tx.send(FileCache {
path: "".to_string(),
vector : fv
}).ok();
}
});
}
let mut i : usize = 0;
let mut last_p = 0;
while i != nof {
if let Ok(result) = result_rx.recv() {
filecache.push(result);
i += 1;
let p = i * 100 / nof;
if p != last_p {
callback(GenState::Parsing, p as u8);
last_p = p;
}
}
}
callback(GenState::Parsing, 100);
});
Self { filecache }
}
pub fn from_file(path : &String) -> Self {
let bytes = std::fs::read(path).expect("could not read index file");
let filecache : Vec<FileCache> = bincode::deserialize(&bytes).unwrap();
Self {
filecache
}
}
pub fn merge(indexes : Vec<Index>, callback : impl Fn(u8)) -> Self {
let max = indexes.len();
let mut filecache = Vec::new();
for (i, index) in indexes.into_iter().enumerate() {
callback((i * 100 / max) as u8);
filecache.extend(index.filecache);
}
callback(100);
Self { filecache }
}
pub fn search(&self, search_args : Vec<String>) -> Vec<SearchResult> {
let mut v : HashMap<Indexer, Count> = HashMap::new();
let mut opt : HashMap<Indexer, Count> = HashMap::new();
for arg in search_args {
let mut hasher = hash32::FnvHasher::default();
let a = arg.trim_start_matches('+');
a.hash(&mut hasher);
let value = hasher.finish32();
if arg.starts_with('+') {
opt.insert(value as Indexer, 1);
} else {
v.insert(value as Indexer, 1);
}
}
let v = FileVector::from_hashmap(v);
let opt = FileVector::from_hashmap(opt);
let mut results : Vec<SearchResult> = Vec::new();
for filecache in self.filecache.iter() {
let mut r = SearchResult { priority : 0, path : filecache.path.clone() };
r.priority = vector::match_vector(&v, &filecache.vector);
if r.priority > 0 {
r.priority += vector::scalar_product(&opt, &filecache.vector);
results.push(r);
}
}
results.sort_by(|a, b| b.priority.cmp(&a.priority));
results
}
pub fn save(&self, path: String) {
let index_file = File::create(path).expect("could not open output file");
let file = BufWriter::new(index_file);
bincode::serialize_into(file, &self.filecache).ok();
}
pub fn num_files(&self) -> usize {
self.filecache.len()
}
}
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