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//! Partitions a list of files into disjoint subsets.
//!
//! Files which do not belong to any explicitly configured `FileSet` belong to
//! the default `FileSet`.
use std::{fmt, iter};
use rustc_hash::FxHashMap;
use crate::{FileId, Vfs, VfsPath};
#[derive(Default, Clone, Eq, PartialEq)]
pub struct FileSet {
files: FxHashMap<VfsPath, FileId>,
paths: FxHashMap<FileId, VfsPath>,
}
impl FileSet {
pub fn resolve_path(&self, anchor: FileId, path: &str) -> Option<FileId> {
let mut base = self.paths[&anchor].clone();
base.pop();
let path = base.join(path)?;
let res = self.files.get(&path).copied();
res
}
pub fn insert(&mut self, file_id: FileId, path: VfsPath) {
self.files.insert(path.clone(), file_id);
self.paths.insert(file_id, path);
}
pub fn iter(&self) -> impl Iterator<Item = FileId> + '_ {
self.paths.keys().copied()
}
}
impl fmt::Debug for FileSet {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("FileSet").field("n_files", &self.files.len()).finish()
}
}
#[derive(Debug)]
pub struct FileSetConfig {
n_file_sets: usize,
roots: Vec<(VfsPath, usize)>,
}
impl Default for FileSetConfig {
fn default() -> Self {
FileSetConfig::builder().build()
}
}
impl FileSetConfig {
pub fn builder() -> FileSetConfigBuilder {
FileSetConfigBuilder::default()
}
pub fn partition(&self, vfs: &Vfs) -> Vec<FileSet> {
let mut res = vec![FileSet::default(); self.len()];
for (file_id, path) in vfs.iter() {
let root = self.classify(&path);
res[root].insert(file_id, path)
}
res
}
fn len(&self) -> usize {
self.n_file_sets
}
fn classify(&self, path: &VfsPath) -> usize {
let idx = match self.roots.binary_search_by(|(p, _)| p.cmp(path)) {
Ok(it) => it,
Err(it) => it.saturating_sub(1),
};
if path.starts_with(&self.roots[idx].0) {
self.roots[idx].1
} else {
self.len() - 1
}
}
}
pub struct FileSetConfigBuilder {
roots: Vec<Vec<VfsPath>>,
}
impl Default for FileSetConfigBuilder {
fn default() -> Self {
FileSetConfigBuilder { roots: Vec::new() }
}
}
impl FileSetConfigBuilder {
pub fn len(&self) -> usize {
self.roots.len()
}
pub fn add_file_set(&mut self, roots: Vec<VfsPath>) {
self.roots.push(roots)
}
pub fn build(self) -> FileSetConfig {
let n_file_sets = self.roots.len() + 1;
let mut roots: Vec<(VfsPath, usize)> = self
.roots
.into_iter()
.enumerate()
.flat_map(|(i, paths)| paths.into_iter().zip(iter::repeat(i)))
.collect();
roots.sort();
FileSetConfig { n_file_sets, roots }
}
}
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