3 files changed, 30 insertions, 17 deletions

diff --git a/crates/ra_db/src/fixture.rs b/crates/ra_db/src/fixture.rs
index 30b598e9a..17cd138c2 100644
--- a/crates/ra_db/src/fixture.rs
+++ b/crates/ra_db/src/fixture.rs
@@ -8,8 +8,8 @@ use rustc_hash::FxHashMap;
 use test_utils::{extract_offset, parse_fixture, CURSOR_MARKER};
 
 use crate::{
-    CrateGraph, CrateId, Edition, Env, FileId, FilePosition, RelativePathBuf, SourceDatabaseExt,
-    SourceRoot, SourceRootId,
+    input::CrateName, CrateGraph, CrateId, Edition, Env, FileId, FilePosition, RelativePathBuf,
+    SourceDatabaseExt, SourceRoot, SourceRootId,
 };
 
 pub const WORKSPACE: SourceRootId = SourceRootId(0);
@@ -139,7 +139,7 @@ fn with_files(db: &mut dyn SourceDatabaseExt, fixture: &str) -> Option<FilePosit
         for (from, to) in crate_deps {
             let from_id = crates[&from];
             let to_id = crates[&to];
-            crate_graph.add_dep(from_id, to.into(), to_id).unwrap();
+            crate_graph.add_dep(from_id, CrateName::new(&to).unwrap(), to_id).unwrap();
         }
     }
 
diff --git a/crates/ra_db/src/input.rs b/crates/ra_db/src/input.rs
index e65761c00..1f1dcea42 100644
--- a/crates/ra_db/src/input.rs
+++ b/crates/ra_db/src/input.rs
@@ -85,12 +85,21 @@ pub struct CrateId(pub u32);
 
 pub struct CrateName(SmolStr);
 
-impl<T: AsRef<str>> From<T> for CrateName {
-    fn from(name: T) -> Self {
-        // For root projects with dashes in their name,
-        // cargo metadata does not do any normalization
-        // so we do it ourselves
-        Self(SmolStr::new(name.as_ref().replace('-', "_")))
+impl CrateName {
+    /// Crates a crate name, checking for dashes in the string provided.
+    /// Dashes are not allowed in the crate names,
+    /// hence the input string is returned as `Err` for those cases.
+    pub fn new(name: &str) -> Result<CrateName, &str> {
+        if name.contains('-') {
+            Err(name)
+        } else {
+            Ok(Self(SmolStr::new(name)))
+        }
+    }
+
+    /// Crates a crate name, unconditionally replacing the dashes with underscores.
+    pub fn normalize_dashes(name: &str) -> CrateName {
+        Self(SmolStr::new(name.replace('-', "_")))
     }
 }
 
@@ -279,7 +288,7 @@ pub struct CyclicDependenciesError;
 
 #[cfg(test)]
 mod tests {
-    use super::{CfgOptions, CrateGraph, Dependency, Edition::Edition2018, Env, FileId};
+    use super::{CfgOptions, CrateGraph, CrateName, Dependency, Edition::Edition2018, Env, FileId};
 
     #[test]
     fn it_should_panic_because_of_cycle_dependencies() {
@@ -290,9 +299,9 @@ mod tests {
             graph.add_crate_root(FileId(2u32), Edition2018, CfgOptions::default(), Env::default());
         let crate3 =
             graph.add_crate_root(FileId(3u32), Edition2018, CfgOptions::default(), Env::default());
-        assert!(graph.add_dep(crate1, "crate2".into(), crate2).is_ok());
-        assert!(graph.add_dep(crate2, "crate3".into(), crate3).is_ok());
-        assert!(graph.add_dep(crate3, "crate1".into(), crate1).is_err());
+        assert!(graph.add_dep(crate1, CrateName::new("crate2").unwrap(), crate2).is_ok());
+        assert!(graph.add_dep(crate2, CrateName::new("crate3").unwrap(), crate3).is_ok());
+        assert!(graph.add_dep(crate3, CrateName::new("crate1").unwrap(), crate1).is_err());
     }
 
     #[test]
@@ -304,8 +313,8 @@ mod tests {
             graph.add_crate_root(FileId(2u32), Edition2018, CfgOptions::default(), Env::default());
         let crate3 =
             graph.add_crate_root(FileId(3u32), Edition2018, CfgOptions::default(), Env::default());
-        assert!(graph.add_dep(crate1, "crate2".into(), crate2).is_ok());
-        assert!(graph.add_dep(crate2, "crate3".into(), crate3).is_ok());
+        assert!(graph.add_dep(crate1, CrateName::new("crate2").unwrap(), crate2).is_ok());
+        assert!(graph.add_dep(crate2, CrateName::new("crate3").unwrap(), crate3).is_ok());
     }
 
     #[test]
@@ -315,7 +324,9 @@ mod tests {
             graph.add_crate_root(FileId(1u32), Edition2018, CfgOptions::default(), Env::default());
         let crate2 =
             graph.add_crate_root(FileId(2u32), Edition2018, CfgOptions::default(), Env::default());
-        assert!(graph.add_dep(crate1, "crate-name-with-dashes".into(), crate2).is_ok());
+        assert!(graph
+            .add_dep(crate1, CrateName::normalize_dashes("crate-name-with-dashes"), crate2)
+            .is_ok());
         assert_eq!(
             graph.dependencies(crate1).collect::<Vec<_>>(),
             vec![&Dependency { crate_id: crate2, name: "crate_name_with_dashes".into() }]
diff --git a/crates/ra_db/src/lib.rs b/crates/ra_db/src/lib.rs
index 21341b769..fb002d717 100644
--- a/crates/ra_db/src/lib.rs
+++ b/crates/ra_db/src/lib.rs
@@ -10,7 +10,9 @@ use ra_syntax::{ast, Parse, SourceFile, TextRange, TextUnit};
 
 pub use crate::{
     cancellation::Canceled,
-    input::{CrateGraph, CrateId, Dependency, Edition, Env, FileId, SourceRoot, SourceRootId},
+    input::{
+        CrateGraph, CrateId, CrateName, Dependency, Edition, Env, FileId, SourceRoot, SourceRootId,
+    },
 };
 pub use relative_path::{RelativePath, RelativePathBuf};
 pub use salsa;