move db basics to ra_db

This should allow to move hir to a separate crate

1 files changed, 76 insertions, 0 deletions

diff --git a/crates/ra_db/src/file_resolver.rs b/crates/ra_db/src/file_resolver.rs
new file mode 100644
index 000000000..f849ac752
--- /dev/null
+++ b/crates/ra_db/src/file_resolver.rs
@@ -0,0 +1,76 @@
+use std::{
+    sync::Arc,
+    hash::{Hash, Hasher},
+    fmt,
+};
+
+use relative_path::RelativePath;
+
+use crate::input::FileId;
+
+pub trait FileResolver: fmt::Debug + Send + Sync + 'static {
+    fn file_stem(&self, file_id: FileId) -> String;
+    fn resolve(&self, file_id: FileId, path: &RelativePath) -> Option<FileId>;
+    fn debug_path(&self, _1file_id: FileId) -> Option<std::path::PathBuf> {
+        None
+    }
+}
+
+#[derive(Clone, Debug)]
+pub struct FileResolverImp {
+    inner: Arc<FileResolver>,
+}
+
+impl PartialEq for FileResolverImp {
+    fn eq(&self, other: &FileResolverImp) -> bool {
+        self.inner() == other.inner()
+    }
+}
+
+impl Eq for FileResolverImp {}
+
+impl Hash for FileResolverImp {
+    fn hash<H: Hasher>(&self, hasher: &mut H) {
+        self.inner().hash(hasher);
+    }
+}
+
+impl FileResolverImp {
+    pub fn new(inner: Arc<FileResolver>) -> FileResolverImp {
+        FileResolverImp { inner }
+    }
+    pub fn file_stem(&self, file_id: FileId) -> String {
+        self.inner.file_stem(file_id)
+    }
+    pub fn resolve(&self, file_id: FileId, path: &RelativePath) -> Option<FileId> {
+        self.inner.resolve(file_id, path)
+    }
+    pub fn debug_path(&self, file_id: FileId) -> Option<std::path::PathBuf> {
+        self.inner.debug_path(file_id)
+    }
+    fn inner(&self) -> *const FileResolver {
+        &*self.inner
+    }
+}
+
+impl Default for FileResolverImp {
+    fn default() -> FileResolverImp {
+        #[derive(Debug)]
+        struct DummyResolver;
+        impl FileResolver for DummyResolver {
+            fn file_stem(&self, _file_: FileId) -> String {
+                panic!("file resolver not set")
+            }
+            fn resolve(
+                &self,
+                _file_id: FileId,
+                _path: &::relative_path::RelativePath,
+            ) -> Option<FileId> {
+                panic!("file resolver not set")
+            }
+        }
+        FileResolverImp {
+            inner: Arc::new(DummyResolver),
+        }
+    }
+}