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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.
pub(crate) mod function;
pub(crate) mod module;
pub(crate) mod db;
mod path;
mod query_definitions;
use ra_syntax::{
ast::{self, AstNode},
TextRange,
};
use crate::{
hir::db::HirDatabase,
hir::function::{resolve_local_name, FnScopes},
loc2id::{DefId, DefLoc},
syntax_ptr::LocalSyntaxPtr,
Cancelable,
};
pub(crate) use self::{
path::{Path, PathKind},
module::{ModuleDescriptor, nameres::FileItemId},
function::FunctionDescriptor,
};
pub(crate) enum Def {
Module(ModuleDescriptor),
Item,
}
impl DefId {
pub(crate) fn resolve(self, db: &impl HirDatabase) -> Cancelable<Def> {
let loc = db.id_maps().def_loc(self);
let res = match loc {
DefLoc::Module { id, source_root } => {
let descr = ModuleDescriptor::new(db, source_root, id)?;
Def::Module(descr)
}
DefLoc::Item { .. } => Def::Item,
};
Ok(res)
}
}
#[derive(Debug)]
pub struct ReferenceDescriptor {
pub range: TextRange,
pub name: String,
}
#[derive(Debug)]
pub struct DeclarationDescriptor<'a> {
pat: ast::BindPat<'a>,
pub range: TextRange,
}
impl<'a> DeclarationDescriptor<'a> {
pub fn new(pat: ast::BindPat) -> DeclarationDescriptor {
let range = pat.syntax().range();
DeclarationDescriptor { pat, range }
}
pub fn find_all_refs(&self) -> Vec<ReferenceDescriptor> {
let name_ptr = LocalSyntaxPtr::new(self.pat.syntax());
let fn_def = match self.pat.syntax().ancestors().find_map(ast::FnDef::cast) {
Some(def) => def,
None => return Default::default(),
};
let fn_scopes = FnScopes::new(fn_def);
let refs: Vec<_> = fn_def
.syntax()
.descendants()
.filter_map(ast::NameRef::cast)
.filter(|name_ref| match resolve_local_name(*name_ref, &fn_scopes) {
None => false,
Some(entry) => entry.ptr() == name_ptr,
})
.map(|name_ref| ReferenceDescriptor {
name: name_ref.syntax().text().to_string(),
range: name_ref.syntax().range(),
})
.collect();
refs
}
}
|
