bendns' repos / rust-analyzer
Unnamed repository; edit this file 'description' to name the repository.
Diffstat (limited to 'crates/base-db/src/input.rs')
-rw-r--r--crates/base-db/src/input.rs54
1 files changed, 47 insertions, 7 deletions
diff --git a/crates/base-db/src/input.rs b/crates/base-db/src/input.rs
index c4ada9c765..80da41222a 100644
--- a/crates/base-db/src/input.rs
+++ b/crates/base-db/src/input.rs
@@ -386,6 +386,37 @@ impl CrateGraph {
self.arena.alloc(data)
}
+ /// Remove the crate from crate graph. If any crates depend on this crate, the dependency would be replaced
+ /// with the second input.
+ pub fn remove_and_replace(
+ &mut self,
+ id: CrateId,
+ replace_with: CrateId,
+ ) -> Result<(), CyclicDependenciesError> {
+ for (x, data) in self.arena.iter() {
+ if x == id {
+ continue;
+ }
+ for edge in &data.dependencies {
+ if edge.crate_id == id {
+ self.check_cycle_after_dependency(edge.crate_id, replace_with)?;
+ }
+ }
+ }
+ // if everything was ok, start to replace
+ for (x, data) in self.arena.iter_mut() {
+ if x == id {
+ continue;
+ }
+ for edge in &mut data.dependencies {
+ if edge.crate_id == id {
+ edge.crate_id = replace_with;
+ }
+ }
+ }
+ Ok(())
+ }
+
pub fn add_dep(
&mut self,
from: CrateId,
@@ -393,17 +424,26 @@ impl CrateGraph {
) -> Result<(), CyclicDependenciesError> {
let _p = profile::span("add_dep");
- // Check if adding a dep from `from` to `to` creates a cycle. To figure
- // that out, look for a path in the *opposite* direction, from `to` to
- // `from`.
- if let Some(path) = self.find_path(&mut FxHashSet::default(), dep.crate_id, from) {
+ self.check_cycle_after_dependency(from, dep.crate_id)?;
+
+ self.arena[from].add_dep(dep);
+ Ok(())
+ }
+
+ /// Check if adding a dep from `from` to `to` creates a cycle. To figure
+ /// that out, look for a path in the *opposite* direction, from `to` to
+ /// `from`.
+ fn check_cycle_after_dependency(
+ &self,
+ from: CrateId,
+ to: CrateId,
+ ) -> Result<(), CyclicDependenciesError> {
+ if let Some(path) = self.find_path(&mut FxHashSet::default(), to, from) {
let path = path.into_iter().map(|it| (it, self[it].display_name.clone())).collect();
let err = CyclicDependenciesError { path };
- assert!(err.from().0 == from && err.to().0 == dep.crate_id);
+ assert!(err.from().0 == from && err.to().0 == to);
return Err(err);
}
-
- self.arena[from].add_dep(dep);
Ok(())
}