1 files changed, 42 insertions, 0 deletions

diff --git a/crates/server/src/util.rs b/crates/server/src/util.rs
new file mode 100644
index 000000000..3691852f0
--- /dev/null
+++ b/crates/server/src/util.rs
@@ -0,0 +1,42 @@
+use std::path::PathBuf;
+use languageserver_types::{TextDocumentItem, VersionedTextDocumentIdentifier, TextDocumentIdentifier};
+use ::{Result};
+
+pub trait FnBox<A, R>: Send {
+    fn call_box(self: Box<Self>, a: A) -> R;
+}
+
+impl<A, R, F: FnOnce(A) -> R + Send> FnBox<A, R> for F {
+    fn call_box(self: Box<F>, a: A) -> R {
+        (*self)(a)
+    }
+}
+
+pub trait FilePath {
+    fn file_path(&self) -> Result<PathBuf>;
+}
+
+impl FilePath for TextDocumentItem {
+    fn file_path(&self) -> Result<PathBuf> {
+        self.uri.file_path()
+    }
+}
+
+impl FilePath for VersionedTextDocumentIdentifier {
+    fn file_path(&self) -> Result<PathBuf> {
+        self.uri.file_path()
+    }
+}
+
+impl FilePath for TextDocumentIdentifier {
+    fn file_path(&self) -> Result<PathBuf> {
+        self.uri.file_path()
+    }
+}
+
+impl FilePath for ::url::Url {
+    fn file_path(&self) -> Result<PathBuf> {
+        self.to_file_path()
+            .map_err(|()| format_err!("invalid uri: {}", self))
+    }
+}