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//! let/for/destructure binding installation.
use super::super::bindings::{
canonical_from_type, extract_let_binding, normalize_alias_expansion, CanonScope,
};
use super::super::local_symbols::{scope_for_local, FileScope};
use super::super::type_infer::resolve::{resolve_type, ResolveContext};
use super::super::type_infer::self_subst::substitute_bare_self;
use super::super::type_infer::{
extract_bindings, extract_for_bindings, infer_type, BindingLookup, CanonicalType, InferContext,
WorkspaceTypeIndex,
};
use super::{
bare, collect_pattern_idents, extract_pat_ident_name, method_unknown, parse_macro_tokens,
CanonicalCallCollector, CollectorBindings, FnContext,
};
use crate::adapters::analyzers::architecture::forbidden_rule::{
file_to_module_segments, resolve_to_crate_absolute_in,
};
use crate::adapters::shared::use_tree::AliasTarget;
use std::collections::{HashMap, HashSet};
use syn::spanned::Spanned;
impl<'a> CanonicalCallCollector<'a> {
/// `let x: T = …` — route the annotation through the full resolver
/// when a workspace index is available so alias expansion + wrapper
/// peeling + trait-bound extraction all apply. Returns `true` when
/// a binding was installed. `false` when there's no workspace index,
/// the pattern isn't a typed ident, or the annotation is `_`. An
/// unresolvable type still installs an `Opaque` tombstone. Operation.
pub(super) fn try_install_annotated_binding(&mut self, local: &syn::Local) -> bool {
let Some(wi) = self.workspace_index else {
return false;
};
let syn::Pat::Type(pt) = &local.pat else {
return false;
};
let syn::Pat::Ident(pi) = pt.pat.as_ref() else {
return false;
};
if matches!(pt.ty.as_ref(), syn::Type::Infer(_)) {
return false;
}
let rctx = ResolveContext {
file: self.file,
mod_stack: self.mod_stack,
type_aliases: Some(&wi.type_aliases),
transparent_wrappers: Some(&wi.transparent_wrappers),
workspace_files: self.workspace_files,
alias_param_subs: None,
generic_params: Some(&self.generic_params),
reexports: self.reexports,
};
let name = pi.ident.to_string();
let resolved = match self.self_type_canonical.as_deref() {
Some(impl_segs) => {
resolve_type(&substitute_bare_self(pt.ty.as_ref(), impl_segs), &rctx)
}
None => resolve_type(pt.ty.as_ref(), &rctx),
};
match resolved {
CanonicalType::Path(segs) => self.install_path_binding(name, segs),
other => self.install_non_path_binding(name, other),
}
true
}
/// Install a `let x = expr` binding via shallow inference on the
/// initializer. `Path` results go into the legacy scope, non-Path
/// results (wrappers, trait bounds) into `non_path_bindings`, and
/// unresolvable initializers (`let s = external()` where we can't
/// name the return type) into `non_path_bindings` as an `Opaque`
/// tombstone so an outer `s: Session` doesn't leak back in when
/// `s.method()` is resolved. Only simple `Pat::Ident` patterns are
/// handled here; destructuring flows through `install_destructure_bindings`.
/// Operation.
pub(super) fn install_inferred_let_binding(&mut self, local: &syn::Local) {
let Some(name) = extract_pat_ident_name(&local.pat) else {
return;
};
let inferred = local
.init
.as_ref()
.and_then(|init| self.infer_receiver_type(&init.expr))
.unwrap_or(CanonicalType::Opaque);
match inferred {
CanonicalType::Path(segs) => self.install_path_binding(name, segs),
other => self.install_non_path_binding(name, other),
}
}
/// Extract pattern bindings from `pat` against a matched-type from
/// `matched_expr`, installing them into the current scope. Path
/// bindings go into the legacy scope, wrapper/trait-bound bindings
/// into `non_path_bindings`. If the matched expression is itself
/// unresolvable, every syntactic binding in the pattern gets an
/// `Opaque` tombstone so outer same-name bindings can't leak back
/// in at a later `.method()` call. Used by `let`-destructuring,
/// `if let`, `while let`, `match` arms. Integration.
pub(super) fn install_destructure_bindings(
&mut self,
pat: &syn::Pat,
matched_expr: &syn::Expr,
) {
let matched = self
.infer_receiver_type(matched_expr)
.unwrap_or(CanonicalType::Opaque);
let pairs = self.extract_pattern_pairs(pat, &matched, PatKind::Value);
self.install_binding_pairs_with_tombstones(pat, pairs);
}
/// Extract for-loop element-type bindings from `pat` against
/// `iter_expr` (the thing being iterated over). Unresolvable
/// iterators tombstone their pattern idents, same as
/// `install_destructure_bindings`. Integration.
pub(super) fn install_for_bindings(&mut self, pat: &syn::Pat, iter_expr: &syn::Expr) {
let iter_type = self
.infer_receiver_type(iter_expr)
.unwrap_or(CanonicalType::Opaque);
let pairs = self.extract_pattern_pairs(pat, &iter_type, PatKind::Iterator);
self.install_binding_pairs_with_tombstones(pat, pairs);
}
/// Wrapper around `patterns::extract_bindings` / `extract_for_bindings`
/// that builds a fresh `InferContext`. Operation.
pub(super) fn extract_pattern_pairs(
&self,
pat: &syn::Pat,
matched: &CanonicalType,
kind: PatKind,
) -> Vec<(String, CanonicalType)> {
let Some(workspace) = self.workspace_index else {
return Vec::new();
};
let adapter = CollectorBindings {
scope: &self.bindings,
non_path_scope: &self.non_path_bindings,
};
let ictx = InferContext {
file: self.file,
mod_stack: self.mod_stack,
workspace,
bindings: &adapter,
self_type: self.self_type_canonical.clone(),
workspace_files: self.workspace_files,
generic_params: Some(&self.generic_params),
reexports: self.reexports,
};
match kind {
PatKind::Value => extract_bindings(pat, matched, &ictx),
PatKind::Iterator => extract_for_bindings(pat, matched, &ictx),
}
}
/// Dispatch each `(name, type)` pair into the right scope map, then
/// walk `pat` and install `Opaque` tombstones for every syntactic
/// ident the resolver didn't reach. This keeps an unresolvable
/// `let (_, s) = external()` or `for s in opaque_iter` from letting
/// an outer `s: Session` leak back in at `s.method()` time.
/// Operation.
pub(super) fn install_binding_pairs_with_tombstones(
&mut self,
pat: &syn::Pat,
pairs: Vec<(String, CanonicalType)>,
) {
let mut resolved: HashSet<String> = HashSet::new();
for (name, ty) in pairs {
resolved.insert(name.clone());
match ty {
CanonicalType::Path(segs) => self.install_path_binding(name, segs),
other => self.install_non_path_binding(name, other),
}
}
let mut idents = Vec::new();
collect_pattern_idents(pat, &mut idents);
for name in idents {
if !resolved.contains(&name) {
self.install_non_path_binding(name, CanonicalType::Opaque);
}
}
}
}
/// Whether `extract_pattern_pairs` should use value-pattern
/// (`let` / `if let` / `match`) or for-loop element-type extraction.
pub(super) enum PatKind {
Value,
Iterator,
}