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use codespan_reporting::files::Files;
use glob::Paths;
use hashbrown::HashMap;
use std::borrow::Cow;
use std::fs::read_to_string;
use std::ops::Range;
use std::path::PathBuf;
use std::sync::atomic::{AtomicUsize, Ordering};
use std::thread::Builder;
use walkdir::WalkDir;
static FILE_ID_COUNTER: AtomicUsize = AtomicUsize::new(1);
const IGNORED: [&str; 1] = ["node_modules"];
const LINTED_FILES: [&str; 2] = ["js", "mjs"];
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct FileWalker {
pub files: HashMap<usize, JsFile>,
}
impl<'a> Files<'a> for FileWalker {
type Name = Cow<'a, str>;
type Source = Cow<'a, str>;
type FileId = usize;
fn name(&'a self, id: Self::FileId) -> Option<Cow<'a, str>> {
let entry = self.files.get(&id)?;
Some(
entry
.path
.as_ref()
.map(|p| p.to_string_lossy())
.unwrap_or_else(|| (&entry.name).into()),
)
}
fn source(&'a self, id: Self::FileId) -> Option<Cow<'a, str>> {
let entry = self.files.get(&id)?;
Some((&entry.source).into())
}
fn line_index(&self, id: Self::FileId, byte_index: usize) -> Option<usize> {
self.files.get(&id)?.line_index(byte_index)
}
fn line_range(&self, id: Self::FileId, line_index: usize) -> Option<Range<usize>> {
let line_start = self.line_start(id, line_index)?;
let next_line_start = self.line_start(id, line_index + 1)?;
Some(line_start..next_line_start)
}
}
impl FileWalker {
pub fn empty() -> Self {
Self {
files: HashMap::new(),
}
}
pub fn from_glob(paths: Paths) -> Self {
let mut threads = Vec::new();
for entry in paths.filter_map(Result::ok) {
if IGNORED.contains(
&entry
.file_name()
.map(|x| x.to_string_lossy().to_string())
.unwrap_or_default()
.as_str(),
) {
continue;
}
for file in WalkDir::new(entry).into_iter().filter_map(Result::ok) {
if !LINTED_FILES.contains(
&file
.path()
.extension()
.map(|osstr| osstr.to_string_lossy().to_string())
.unwrap_or_default()
.as_str(),
) {
continue;
}
if IGNORED.contains(&file.file_name().to_string_lossy().to_string().as_str()) {
continue;
}
let thread = Builder::new()
.name(format!("io-{}", file.file_name().to_string_lossy()))
.spawn(move || {
(
read_to_string(file.path()).expect("Failed to read file"),
file.path().to_owned(),
)
})
.expect("Failed to spawn IO thread");
threads.push(thread);
}
}
let jsfiles = threads
.into_iter()
.map(|handle| handle.join())
.filter_map(Result::ok)
.map(|(src, path)| JsFile::new_concrete(src, path))
.map(|file| (file.id, file))
.collect();
Self { files: jsfiles }
}
pub fn line_start(&self, id: usize, line_index: usize) -> Option<usize> {
self.files.get(&id)?.line_start(line_index)
}
}
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub struct JsFile {
pub source: String,
pub name: String,
pub path: Option<PathBuf>,
pub id: usize,
pub kind: JsFileKind,
pub line_starts: Vec<usize>,
}
#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
pub enum JsFileKind {
Script,
Module,
}
impl JsFile {
pub fn new_concrete(source: String, path: PathBuf) -> Self {
let id = FILE_ID_COUNTER.fetch_add(1, Ordering::SeqCst);
let kind = if path
.extension()
.map_or("".into(), |ext| ext.to_string_lossy())
== "mjs"
{
JsFileKind::Module
} else {
JsFileKind::Script
};
let line_starts = Self::line_starts(&source).collect();
Self {
source,
name: path
.file_name()
.map_or(String::new(), |osstr| osstr.to_string_lossy().to_string()),
path: Some(path),
id,
kind,
line_starts,
}
}
fn line_starts<'a>(source: &'a str) -> impl Iterator<Item = usize> + 'a {
std::iter::once(0).chain(source.match_indices('\n').map(|(i, _)| i + 1))
}
pub fn line_start(&self, line_index: usize) -> Option<usize> {
use std::cmp::Ordering;
match line_index.cmp(&self.line_starts.len()) {
Ordering::Less => self.line_starts.get(line_index).cloned(),
Ordering::Equal => Some(self.source.len()),
Ordering::Greater => None,
}
}
pub fn line_index(&self, byte_index: usize) -> Option<usize> {
match self.line_starts.binary_search(&byte_index) {
Ok(line) => Some(line),
Err(next_line) => Some(next_line - 1),
}
}
pub fn line_col_to_index(&self, line: usize, column: usize) -> Option<usize> {
let start = self.line_start(line)?;
Some(start + column)
}
}