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|
//! HIR (previsouly known as descriptors) provides a high-level OO acess to Rust
//! code.
//!
//! The principal difference between HIR and syntax trees is that HIR is bound
//! to a particular crate instance. That is, it has cfg flags and features
//! applied. So, there relation between syntax and HIR is many-to-one.
macro_rules! ctry {
($expr:expr) => {
match $expr {
None => return Ok(None),
Some(it) => it,
}
};
}
pub mod db;
#[cfg(test)]
mod mock;
mod query_definitions;
mod function;
mod module;
mod path;
mod arena;
use std::ops::Index;
use ra_syntax::{SyntaxNodeRef, SyntaxNode};
use ra_db::{LocationIntener, SourceRootId, FileId, Cancelable};
use crate::{
db::HirDatabase,
arena::{Arena, Id},
};
pub use self::{
path::{Path, PathKind},
module::{Module, ModuleId, Problem, nameres::ItemMap},
function::{Function, FnScopes},
};
pub use self::function::FnSignatureInfo;
/// Def's are a core concept of hir. A `Def` is an Item (function, module, etc)
/// in a specific module.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct DefId(u32);
ra_db::impl_numeric_id!(DefId);
#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
pub(crate) enum DefKind {
Module,
Function,
Item,
}
#[derive(Clone, Debug, PartialEq, Eq, Hash)]
pub struct DefLoc {
pub(crate) kind: DefKind,
source_root_id: SourceRootId,
module_id: ModuleId,
source_item_id: SourceItemId,
}
impl DefId {
pub(crate) fn loc(self, db: &impl AsRef<LocationIntener<DefLoc, DefId>>) -> DefLoc {
db.as_ref().id2loc(self)
}
}
impl DefLoc {
pub(crate) fn id(&self, db: &impl AsRef<LocationIntener<DefLoc, DefId>>) -> DefId {
db.as_ref().loc2id(&self)
}
}
pub enum Def {
Module(Module),
Function(Function),
Item,
}
impl DefId {
pub fn resolve(self, db: &impl HirDatabase) -> Cancelable<Def> {
let loc = self.loc(db);
let res = match loc.kind {
DefKind::Module => {
let module = Module::new(db, loc.source_root_id, loc.module_id)?;
Def::Module(module)
}
DefKind::Function => {
let function = Function::new(self);
Def::Function(function)
}
DefKind::Item => Def::Item,
};
Ok(res)
}
}
/// Identifier of item within a specific file. This is stable over reparses, so
/// it's OK to use it as a salsa key/value.
pub(crate) type SourceFileItemId = Id<SyntaxNode>;
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct SourceItemId {
file_id: FileId,
item_id: SourceFileItemId,
}
/// Maps item's `SyntaxNode`s to `SourceFileItemId` and back.
#[derive(Debug, PartialEq, Eq, Default)]
pub struct SourceFileItems {
arena: Arena<SyntaxNode>,
}
impl SourceFileItems {
fn alloc(&mut self, item: SyntaxNode) -> SourceFileItemId {
self.arena.alloc(item)
}
pub fn id_of(&self, item: SyntaxNodeRef) -> SourceFileItemId {
let (id, _item) = self
.arena
.iter()
.find(|(_id, i)| i.borrowed() == item)
.unwrap();
id
}
pub fn id_of_source_file(&self) -> SourceFileItemId {
let (id, _syntax) = self.arena.iter().next().unwrap();
id
}
}
impl Index<SourceFileItemId> for SourceFileItems {
type Output = SyntaxNode;
fn index(&self, idx: SourceFileItemId) -> &SyntaxNode {
&self.arena[idx]
}
}
|
