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//! This module resolves `mod foo;` declaration to file.
use arrayvec::ArrayVec;
use base_db::{AnchoredPath, FileId};
use hir_expand::name::Name;
use limit::Limit;
use syntax::SmolStr;
use crate::{db::DefDatabase, HirFileId};
const MOD_DEPTH_LIMIT: Limit = Limit::new(32);
#[derive(Clone, Debug)]
pub(super) struct ModDir {
/// `` for `mod.rs`, `lib.rs`
/// `foo/` for `foo.rs`
/// `foo/bar/` for `mod bar { mod x; }` nested in `foo.rs`
/// Invariant: path.is_empty() || path.ends_with('/')
dir_path: DirPath,
/// inside `./foo.rs`, mods with `#[path]` should *not* be relative to `./foo/`
root_non_dir_owner: bool,
depth: u32,
}
impl ModDir {
pub(super) fn root() -> ModDir {
ModDir { dir_path: DirPath::empty(), root_non_dir_owner: false, depth: 0 }
}
pub(super) fn descend_into_definition(
&self,
name: &Name,
attr_path: Option<&SmolStr>,
) -> Option<ModDir> {
let path = match attr_path.map(SmolStr::as_str) {
None => {
let mut path = self.dir_path.clone();
path.push(&name.unescaped().to_smol_str());
path
}
Some(attr_path) => {
let mut path = self.dir_path.join_attr(attr_path, self.root_non_dir_owner);
if !(path.is_empty() || path.ends_with('/')) {
path.push('/')
}
DirPath::new(path)
}
};
self.child(path, false)
}
fn child(&self, dir_path: DirPath, root_non_dir_owner: bool) -> Option<ModDir> {
let depth = self.depth + 1;
if MOD_DEPTH_LIMIT.check(depth as usize).is_err() {
tracing::error!("MOD_DEPTH_LIMIT exceeded");
cov_mark::hit!(circular_mods);
return None;
}
Some(ModDir { dir_path, root_non_dir_owner, depth })
}
pub(super) fn resolve_declaration(
&self,
db: &dyn DefDatabase,
file_id: HirFileId,
name: &Name,
attr_path: Option<&SmolStr>,
) -> Result<(FileId, bool, ModDir), Box<[String]>> {
let name = name.unescaped();
let orig_file_id = file_id.original_file(db.upcast());
let mut candidate_files = ArrayVec::<_, 2>::new();
match attr_path {
Some(attr_path) => {
candidate_files.push(self.dir_path.join_attr(attr_path, self.root_non_dir_owner))
}
None if file_id.is_include_macro(db.upcast()) => {
candidate_files.push(format!("{name}.rs"));
candidate_files.push(format!("{name}/mod.rs"));
}
None => {
candidate_files.push(format!("{}{name}.rs", self.dir_path.0));
candidate_files.push(format!("{}{name}/mod.rs", self.dir_path.0));
}
};
for candidate in candidate_files.iter() {
let path = AnchoredPath { anchor: orig_file_id, path: candidate.as_str() };
if let Some(file_id) = db.resolve_path(path) {
let is_mod_rs = candidate.ends_with("/mod.rs");
let (dir_path, root_non_dir_owner) = if is_mod_rs || attr_path.is_some() {
(DirPath::empty(), false)
} else {
(DirPath::new(format!("{name}/")), true)
};
if let Some(mod_dir) = self.child(dir_path, root_non_dir_owner) {
return Ok((file_id, is_mod_rs, mod_dir));
}
}
}
Err(candidate_files.into_iter().collect())
}
}
#[derive(Clone, Debug)]
struct DirPath(String);
impl DirPath {
fn assert_invariant(&self) {
assert!(self.0.is_empty() || self.0.ends_with('/'));
}
fn new(repr: String) -> DirPath {
let res = DirPath(repr);
res.assert_invariant();
res
}
fn empty() -> DirPath {
DirPath::new(String::new())
}
fn push(&mut self, name: &str) {
self.0.push_str(name);
self.0.push('/');
self.assert_invariant();
}
fn parent(&self) -> Option<&str> {
if self.0.is_empty() {
return None;
};
let idx =
self.0[..self.0.len() - '/'.len_utf8()].rfind('/').map_or(0, |it| it + '/'.len_utf8());
Some(&self.0[..idx])
}
/// So this is the case which doesn't really work I think if we try to be
/// 100% platform agnostic:
///
/// ```
/// mod a {
/// #[path="C://sad/face"]
/// mod b { mod c; }
/// }
/// ```
///
/// Here, we need to join logical dir path to a string path from an
/// attribute. Ideally, we should somehow losslessly communicate the whole
/// construction to `FileLoader`.
fn join_attr(&self, mut attr: &str, relative_to_parent: bool) -> String {
let base = if relative_to_parent { self.parent().unwrap() } else { &self.0 };
if attr.starts_with("./") {
attr = &attr["./".len()..];
}
let tmp;
let attr = if attr.contains('\\') {
tmp = attr.replace('\\', "/");
&tmp
} else {
attr
};
let res = format!("{base}{attr}");
res
}
}
|
