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|
use std::{
collections::BTreeMap,
};
use relative_path::RelativePathBuf;
use libsyntax2::{
SmolStr,
ast::{self, NameOwner},
};
use {
FileId,
imp::FileResolverImp,
};
#[derive(Debug, Hash)]
pub struct ModuleDescriptor {
pub submodules: Vec<Submodule>
}
impl ModuleDescriptor {
pub fn new(root: ast::Root) -> ModuleDescriptor {
let submodules = modules(root)
.map(|(name, _)| Submodule { name })
.collect();
ModuleDescriptor { submodules } }
}
fn modules<'a>(root: ast::Root<'a>) -> impl Iterator<Item=(SmolStr, ast::Module<'a>)> {
root
.modules()
.filter_map(|module| {
let name = module.name()?.text();
if !module.has_semi() {
return None;
}
Some((name, module))
})
}
#[derive(Clone, Hash, PartialEq, Eq, Debug)]
pub struct Submodule {
pub name: SmolStr,
}
#[derive(Hash)]
pub(crate) struct ModuleTreeDescriptor {
nodes: Vec<NodeData>,
links: Vec<LinkData>,
file_id2node: BTreeMap<FileId, Node>,
}
#[derive(Clone, Copy, PartialEq, Eq, Hash)]
struct Node(usize);
#[derive(Hash)]
struct NodeData {
file_id: FileId,
links: Vec<Link>,
parents: Vec<Link>
}
#[derive(Clone, Copy, PartialEq, Eq, Hash)]
pub(crate) struct Link(usize);
#[derive(Hash)]
struct LinkData {
owner: Node,
name: SmolStr,
points_to: Vec<Node>,
problem: Option<Problem>,
}
#[derive(Clone, Debug, Hash)]
pub enum Problem {
UnresolvedModule {
candidate: RelativePathBuf,
},
NotDirOwner {
move_to: RelativePathBuf,
candidate: RelativePathBuf,
}
}
impl ModuleTreeDescriptor {
pub(crate) fn new<'a>(
files: impl Iterator<Item=(FileId, &'a ModuleDescriptor)> + Clone,
file_resolver: &FileResolverImp,
) -> ModuleTreeDescriptor {
let mut file_id2node = BTreeMap::new();
let mut nodes: Vec<NodeData> = files.clone().enumerate()
.map(|(idx, (file_id, _))| {
file_id2node.insert(file_id, Node(idx));
NodeData {
file_id,
links: Vec::new(),
parents: Vec::new(),
}
})
.collect();
let mut links = Vec::new();
for (idx, (file_id, descr)) in files.enumerate() {
let owner = Node(idx);
for sub in descr.submodules.iter() {
let link = Link(links.len());
nodes[owner.0].links.push(link);
let (points_to, problem) = resolve_submodule(file_id, &sub.name, file_resolver);
let points_to = points_to
.into_iter()
.map(|file_id| {
let node = file_id2node[&file_id];
nodes[node.0].parents.push(link);
node
})
.collect();
links.push(LinkData {
owner,
name: sub.name.clone(),
points_to,
problem,
})
}
}
ModuleTreeDescriptor {
nodes, links, file_id2node
}
}
pub(crate) fn parent_modules(&self, file_id: FileId) -> Vec<Link> {
let node = self.file_id2node[&file_id];
self.node(node)
.parents
.clone()
}
pub(crate) fn child_module_by_name(&self, file_id: FileId, name: &str) -> Vec<FileId> {
let node = self.file_id2node[&file_id];
self.node(node)
.links
.iter()
.filter(|it| it.name(self) == name)
.map(|link| link.owner(self))
.collect()
}
pub(crate) fn problems<'a, 'b>(&'b self, file_id: FileId, root: ast::Root<'a>) -> Vec<(ast::Name<'a>, &'b Problem)> {
let node = self.file_id2node[&file_id];
self.node(node)
.links
.iter()
.filter_map(|&link| {
let problem = self.link(link).problem.as_ref()?;
let name = link.bind_source(self, root).name()?;
Some((name, problem))
})
.collect()
}
fn node(&self, node: Node) -> &NodeData {
&self.nodes[node.0]
}
fn link(&self, link: Link) -> &LinkData {
&self.links[link.0]
}
}
impl Link {
pub(crate) fn name(self, tree: &ModuleTreeDescriptor) -> SmolStr {
tree.link(self).name.clone()
}
pub(crate) fn owner(self, tree: &ModuleTreeDescriptor) -> FileId {
let owner = tree.link(self).owner;
tree.node(owner).file_id
}
pub(crate) fn bind_source<'a>(self, tree: &ModuleTreeDescriptor, root: ast::Root<'a>) -> ast::Module<'a> {
modules(root)
.filter(|(name, _)| name == &tree.link(self).name)
.next()
.unwrap()
.1
}
}
fn resolve_submodule(
file_id: FileId,
name: &SmolStr,
file_resolver: &FileResolverImp
) -> (Vec<FileId>, Option<Problem>) {
let mod_name = file_resolver.file_stem(file_id);
let is_dir_owner =
mod_name == "mod" || mod_name == "lib" || mod_name == "main";
let file_mod = RelativePathBuf::from(format!("../{}.rs", name));
let dir_mod = RelativePathBuf::from(format!("../{}/mod.rs", name));
let points_to: Vec<FileId>;
let problem: Option<Problem>;
if is_dir_owner {
points_to = [&file_mod, &dir_mod].iter()
.filter_map(|path| file_resolver.resolve(file_id, path))
.collect();
problem = if points_to.is_empty() {
Some(Problem::UnresolvedModule {
candidate: file_mod,
})
} else {
None
}
} else {
points_to = Vec::new();
problem = Some(Problem::NotDirOwner {
move_to: RelativePathBuf::from(format!("../{}/mod.rs", mod_name)),
candidate: file_mod,
});
}
(points_to, problem)
}
|
