fix: find reference in USE after comment

Fixes #450

Author: gnikit

fortls/parsers/internal/parser.py

@@ -637,7 +637,7 @@ def read_use_stmt(line: str) -> tuple[Literal["use"], Use] | None:
     if use_match is None:
         return None
 
-    trailing_line = line[use_match.end(0) :].lower()
+    trailing_line = line[use_match.end(0) :].lower().split("!")[0]
     use_mod = use_match.group(2)
     only_list: set[str] = set()
     rename_map: dict[str, str] = {}

test/test_server_references.py

@@ -60,3 +60,18 @@ def test_references_ignore_comments_fixed():
     errcode, results = run_request(string)
     assert errcode == 0
     assert len(results[1]) == 2
+
+
+def test_references_ignore_comments_on_use_import():
+    string = write_rpc_request(1, "initialize", {"rootPath": str(test_dir / "use")})
+    file_path = test_dir / "use" / "comment_after_use.f90"
+    string += ref_req(file_path, 6, 31)
+    errcode, results = run_request(string, ["-n", "1"])
+    assert errcode == 0
+    validate_refs(
+        results[1],
+        (
+            [str(file_path), 1, 15, 27],
+            [str(file_path), 5, 23, 35],
+        ),
+    )

test/test_source/use/comment_after_use.f90

@@ -0,0 +1,7 @@
+module dep_mod
+    integer :: dep_variable
+end module dep_mod
+
+module user_mod
+    use dep_mod, only: dep_variable ! disabling comment
+end module user_mod