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|
pub(super) mod imp;
pub(crate) mod scope;
use ra_syntax::{
ast::{self, AstNode, NameOwner},
SmolStr, SyntaxNode,
};
use relative_path::RelativePathBuf;
use crate::{db::SyntaxDatabase, syntax_ptr::SyntaxPtr, FileId};
pub(crate) use self::scope::ModuleScope;
/// Phisically, rust source is organized as a set of files, but logically it is
/// organized as a tree of modules. Usually, a single file corresponds to a
/// single module, but it is not nessary the case.
///
/// Module encapsulate the logic of transitioning from the fuzzy world of files
/// (which can have multiple parents) to the precise world of modules (which
/// always have one parent).
#[derive(Debug, PartialEq, Eq, Hash)]
pub(crate) struct ModuleTree {
mods: Vec<ModuleData>,
links: Vec<LinkData>,
}
impl ModuleTree {
pub(crate) fn modules_for_source(&self, source: ModuleSource) -> Vec<ModuleId> {
self.mods
.iter()
.enumerate()
.filter(|(_idx, it)| it.source == source)
.map(|(idx, _)| ModuleId(idx as u32))
.collect()
}
pub(crate) fn any_module_for_source(&self, source: ModuleSource) -> Option<ModuleId> {
self.modules_for_source(source).pop()
}
}
/// `ModuleSource` is the syntax tree element that produced this module:
/// either a file, or an inlinde module.
/// TODO: we don't produce Inline modules yet
#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
pub(crate) enum ModuleSource {
File(FileId),
#[allow(dead_code)]
Inline(SyntaxPtr),
}
/// An owned syntax node for a module. Unlike `ModuleSource`,
/// this holds onto the AST for the whole file.
enum ModuleSourceNode {
Root(ast::RootNode),
Inline(ast::ModuleNode),
}
#[derive(Clone, Copy, PartialEq, Eq, Hash, PartialOrd, Ord, Debug)]
pub(crate) struct ModuleId(u32);
#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug)]
pub(crate) struct LinkId(u32);
#[derive(Clone, Debug, Hash, PartialEq, Eq)]
pub enum Problem {
UnresolvedModule {
candidate: RelativePathBuf,
},
NotDirOwner {
move_to: RelativePathBuf,
candidate: RelativePathBuf,
},
}
impl ModuleId {
pub(crate) fn source(self, tree: &ModuleTree) -> ModuleSource {
tree.module(self).source
}
pub(crate) fn parent_link(self, tree: &ModuleTree) -> Option<LinkId> {
tree.module(self).parent
}
pub(crate) fn parent(self, tree: &ModuleTree) -> Option<ModuleId> {
let link = self.parent_link(tree)?;
Some(tree.link(link).owner)
}
pub(crate) fn root(self, tree: &ModuleTree) -> ModuleId {
let mut curr = self;
let mut i = 0;
while let Some(next) = curr.parent(tree) {
curr = next;
i += 1;
// simplistic cycle detection
if i > 100 {
return self;
}
}
curr
}
pub(crate) fn child(self, tree: &ModuleTree, name: &str) -> Option<ModuleId> {
let link = tree
.module(self)
.children
.iter()
.map(|&it| tree.link(it))
.find(|it| it.name == name)?;
Some(*link.points_to.first()?)
}
pub(crate) fn problems(
self,
tree: &ModuleTree,
db: &impl SyntaxDatabase,
) -> Vec<(SyntaxNode, Problem)> {
tree.module(self)
.children
.iter()
.filter_map(|&it| {
let p = tree.link(it).problem.clone()?;
let s = it.bind_source(tree, db);
let s = s.ast().name().unwrap().syntax().owned();
Some((s, p))
})
.collect()
}
}
impl LinkId {
pub(crate) fn owner(self, tree: &ModuleTree) -> ModuleId {
tree.link(self).owner
}
pub(crate) fn bind_source<'a>(
self,
tree: &ModuleTree,
db: &impl SyntaxDatabase,
) -> ast::ModuleNode {
let owner = self.owner(tree);
match owner.source(tree).resolve(db) {
ModuleSourceNode::Root(root) => {
let ast = imp::modules(root.ast())
.find(|(name, _)| name == &tree.link(self).name)
.unwrap()
.1;
ast.into()
}
ModuleSourceNode::Inline(it) => it,
}
}
}
#[derive(Debug, PartialEq, Eq, Hash)]
struct ModuleData {
source: ModuleSource,
parent: Option<LinkId>,
children: Vec<LinkId>,
}
impl ModuleSource {
pub(crate) fn new_inline(file_id: FileId, module: ast::Module) -> ModuleSource {
assert!(!module.has_semi());
let ptr = SyntaxPtr::new(file_id, module.syntax());
ModuleSource::Inline(ptr)
}
pub(crate) fn as_file(self) -> Option<FileId> {
match self {
ModuleSource::File(f) => Some(f),
ModuleSource::Inline(..) => None,
}
}
pub(crate) fn file_id(self) -> FileId {
match self {
ModuleSource::File(f) => f,
ModuleSource::Inline(ptr) => ptr.file_id(),
}
}
fn resolve(self, db: &impl SyntaxDatabase) -> ModuleSourceNode {
match self {
ModuleSource::File(file_id) => {
let syntax = db.file_syntax(file_id);
ModuleSourceNode::Root(syntax.ast().into())
}
ModuleSource::Inline(ptr) => {
let syntax = db.resolve_syntax_ptr(ptr);
let syntax = syntax.borrowed();
let module = ast::Module::cast(syntax).unwrap();
ModuleSourceNode::Inline(module.into())
}
}
}
}
#[derive(Hash, Debug, PartialEq, Eq)]
struct LinkData {
owner: ModuleId,
name: SmolStr,
points_to: Vec<ModuleId>,
problem: Option<Problem>,
}
impl ModuleTree {
fn module(&self, id: ModuleId) -> &ModuleData {
&self.mods[id.0 as usize]
}
fn module_mut(&mut self, id: ModuleId) -> &mut ModuleData {
&mut self.mods[id.0 as usize]
}
fn link(&self, id: LinkId) -> &LinkData {
&self.links[id.0 as usize]
}
fn link_mut(&mut self, id: LinkId) -> &mut LinkData {
&mut self.links[id.0 as usize]
}
fn push_mod(&mut self, data: ModuleData) -> ModuleId {
let id = ModuleId(self.mods.len() as u32);
self.mods.push(data);
id
}
fn push_link(&mut self, data: LinkData) -> LinkId {
let id = LinkId(self.links.len() as u32);
self.mods[data.owner.0 as usize].children.push(id);
self.links.push(data);
id
}
}
|
