Merge #1499

1499: processing attribute #[path] of module  r=matklad a=andreevlex

support two cases
- simple name file `foo.rs`
- declaration in mod.rs

#1211 

Co-authored-by: Alexander Andreev <[email protected]>

1 files changed, 192 insertions, 0 deletions

diff --git a/crates/ra_hir/src/nameres/tests/mods.rs b/crates/ra_hir/src/nameres/tests/mods.rs
new file mode 100644
index 000000000..7c8c832fc
--- /dev/null
+++ b/crates/ra_hir/src/nameres/tests/mods.rs
@@ -0,0 +1,192 @@
+use super::*;
+
+#[test]
+fn name_res_works_for_broken_modules() {
+    covers!(name_res_works_for_broken_modules);
+    let map = def_map(
+        "
+        //- /lib.rs
+        mod foo // no `;`, no body
+
+        use self::foo::Baz;
+
+        //- /foo/mod.rs
+        pub mod bar;
+
+        pub use self::bar::Baz;
+
+        //- /foo/bar.rs
+        pub struct Baz;
+        ",
+    );
+    assert_snapshot_matches!(map, @r###"
+        ⋮crate
+        ⋮Baz: _
+    "###);
+}
+
+#[test]
+fn module_resolution_works_for_non_standard_filenames() {
+    let map = def_map_with_crate_graph(
+        "
+        //- /my_library.rs
+        mod foo;
+        use self::foo::Bar;
+
+        //- /foo/mod.rs
+        pub struct Bar;
+        ",
+        crate_graph! {
+            "my_library": ("/my_library.rs", []),
+        },
+    );
+
+    assert_snapshot_matches!(map, @r###"
+        ⋮crate
+        ⋮Bar: t v
+        ⋮foo: t
+        ⋮
+        ⋮crate::foo
+        ⋮Bar: t v
+    "###);
+}
+
+#[test]
+fn module_resolution_works_for_raw_modules() {
+    let map = def_map_with_crate_graph(
+        "
+        //- /library.rs
+        mod r#async;
+        use self::r#async::Bar;
+
+        //- /async.rs
+        pub struct Bar;
+        ",
+        crate_graph! {
+            "library": ("/library.rs", []),
+        },
+    );
+
+    assert_snapshot_matches!(map, @r###"
+        ⋮crate
+        ⋮Bar: t v
+        ⋮async: t
+        ⋮
+        ⋮crate::async
+        ⋮Bar: t v
+    "###);
+}
+
+#[test]
+fn module_resolution_decl_path() {
+    let map = def_map_with_crate_graph(
+        "
+        //- /library.rs
+        #[path = \"bar/baz/foo.rs\"]
+        mod foo;
+        use self::foo::Bar;
+
+        //- /bar/baz/foo.rs
+        pub struct Bar;
+        ",
+        crate_graph! {
+            "library": ("/library.rs", []),
+        },
+    );
+
+    assert_snapshot_matches!(map, @r###"
+        ⋮crate
+        ⋮Bar: t v
+        ⋮foo: t
+        ⋮
+        ⋮crate::foo
+        ⋮Bar: t v
+    "###);
+}
+
+#[test]
+fn module_resolution_module_with_path_in_mod_rs() {
+    let map = def_map_with_crate_graph(
+        "
+        //- /main.rs
+        mod foo;
+        
+        //- /foo/mod.rs
+        #[path = \"baz.rs\"]
+        pub mod bar;
+
+        use self::bar::Baz;
+
+        //- /foo/baz.rs
+        pub struct Baz;
+        ",
+        crate_graph! {
+            "main": ("/main.rs", []),
+        },
+    );
+
+    assert_snapshot_matches!(map, @r###"
+        ⋮crate
+        ⋮foo: t
+        ⋮
+        ⋮crate::foo
+        ⋮Baz: t v
+        ⋮bar: t
+        ⋮
+        ⋮crate::foo::bar
+        ⋮Baz: t v
+    "###);
+}
+
+#[test]
+fn module_resolution_module_with_path_non_crate_root() {
+    let map = def_map_with_crate_graph(
+        "
+        //- /main.rs
+        mod foo;
+        
+        //- /foo.rs
+        #[path = \"baz.rs\"]
+        pub mod bar;
+
+        use self::bar::Baz;
+
+        //- /baz.rs
+        pub struct Baz;
+        ",
+        crate_graph! {
+            "main": ("/main.rs", []),
+        },
+    );
+
+    assert_snapshot_matches!(map, @r###"
+        ⋮crate
+        ⋮foo: t
+        ⋮
+        ⋮crate::foo
+        ⋮Baz: t v
+        ⋮bar: t
+        ⋮
+        ⋮crate::foo::bar
+        ⋮Baz: t v
+    "###);
+}
+
+#[test]
+fn unresolved_module_diagnostics() {
+    let diagnostics = MockDatabase::with_files(
+        r"
+        //- /lib.rs
+        mod foo;
+        mod bar;
+        mod baz {}
+        //- /foo.rs
+        ",
+    )
+    .diagnostics();
+
+    assert_snapshot_matches!(diagnostics, @r###"
+"mod bar;": unresolved module
+"###
+    );
+}