1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
|
#![allow(unused_variables, dead_code)]
//! Name resolution.
use std::sync::Arc;
use rustc_hash::FxHashMap;
use crate::{
ModuleDef,
name::Name,
nameres::{PerNs, lower::ImportId, ItemMap},
module_tree::ModuleId,
generics::GenericParams,
expr::{Body, scope::{ExprScopes, ScopeId}, PatId},
impl_block::ImplBlock,
path::Path,
};
#[derive(Debug, Clone, Default)]
pub struct Resolver {
scopes: Vec<Scope>, // maybe a 'linked list' of scopes? or allow linking a Resolver to a parent Resolver? that's an optimization that might not be necessary, though
}
// TODO how to store these best
#[derive(Debug, Clone)]
pub(crate) struct ModuleItemMap {
item_map: Arc<ItemMap>,
module_id: ModuleId,
}
#[derive(Debug, Clone)]
pub(crate) struct ExprScope {
expr_scopes: Arc<ExprScopes>,
scope_id: ScopeId,
}
#[derive(Debug, Clone)]
pub(crate) enum Scope {
/// All the items and imported names of a module
ModuleScope(ModuleItemMap),
/// Brings the generic parameters of an item into scope
GenericParams(Arc<GenericParams>),
/// Brings the function parameters into scope
FunctionParams(Arc<Body>),
/// Brings `Self` into scope
ImplBlockScope(ImplBlock),
/// Local bindings
ExprScope(ExprScope),
}
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum Resolution {
/// An item
Def {
def: ModuleDef,
import: Option<ImportId>,
},
/// A local binding (only value namespace)
LocalBinding { pat: PatId },
/// A generic parameter
GenericParam { idx: u32 },
// TODO how does `Self` resolve?
}
impl Resolver {
pub fn resolve_name(&self, name: &Name) -> PerNs<Resolution> {
for scope in self.scopes.iter().rev() {
let resolution = scope.resolve_name(name);
if !resolution.is_none() {
return resolution;
}
}
PerNs::none()
}
pub fn resolve_path(&self, path: &Path) -> PerNs<Resolution> {
unimplemented!()
}
pub fn all_names(&self) -> FxHashMap<Name, Resolution> {
unimplemented!()
}
}
impl Resolver {
pub(crate) fn push_scope(mut self, scope: Scope) -> Resolver {
self.scopes.push(scope);
self
}
pub(crate) fn push_generic_params_scope(self, params: Arc<GenericParams>) -> Resolver {
self.push_scope(Scope::GenericParams(params))
}
pub(crate) fn push_impl_block_scope(self, impl_block: ImplBlock) -> Resolver {
self.push_scope(Scope::ImplBlockScope(impl_block))
}
pub(crate) fn push_module_scope(self, item_map: Arc<ItemMap>, module_id: ModuleId) -> Resolver {
self.push_scope(Scope::ModuleScope(ModuleItemMap {
item_map,
module_id,
}))
}
pub(crate) fn push_expr_scope(
self,
expr_scopes: Arc<ExprScopes>,
scope_id: ScopeId,
) -> Resolver {
self.push_scope(Scope::ExprScope(ExprScope {
expr_scopes,
scope_id,
}))
}
pub(crate) fn push_function_params(self, body: Arc<Body>) -> Resolver {
self.push_scope(Scope::FunctionParams(body))
}
pub(crate) fn pop_scope(mut self) -> Resolver {
self.scopes.pop();
self
}
}
impl Scope {
fn resolve_name(&self, name: &Name) -> PerNs<Resolution> {
unimplemented!()
}
}
|
