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--- /dev/null
+use ra_syntax::{
+ File, TextRange, SyntaxKind, SyntaxNode, SyntaxNodeRef,
+ ast::{self, AstNode},
+};
+
+use crate::FileId;
+use crate::db::SyntaxDatabase;
+
+/// SyntaxPtr is a cheap `Copy` id which identifies a particular syntax node,
+/// without retainig syntax tree in memory. You need to explicitelly `resovle`
+/// `SyntaxPtr` to get a `SyntaxNode`
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub(crate) struct SyntaxPtr {
+ file_id: FileId,
+ local: LocalSyntaxPtr,
+}
+
+impl SyntaxPtr {
+ pub(crate) fn new(file_id: FileId, node: SyntaxNodeRef) -> SyntaxPtr {
+ let local = LocalSyntaxPtr::new(node);
+ SyntaxPtr { file_id, local }
+ }
+
+ pub(crate) fn resolve(self, db: &impl SyntaxDatabase) -> SyntaxNode {
+ let syntax = db.file_syntax(self.file_id);
+ self.local.resolve(&syntax)
+ }
+}
+
+
+/// A pionter to a syntax node inside a file.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+struct LocalSyntaxPtr {
+ range: TextRange,
+ kind: SyntaxKind,
+}
+
+impl LocalSyntaxPtr {
+ fn new(node: SyntaxNodeRef) -> LocalSyntaxPtr {
+ LocalSyntaxPtr {
+ range: node.range(),
+ kind: node.kind(),
+ }
+ }
+
+ fn resolve(self, file: &File) -> SyntaxNode {
+ let mut curr = file.syntax();
+ loop {
+ if curr.range() == self.range && curr.kind() == self.kind {
+ return curr.owned();
+ }
+ curr = curr.children()
+ .find(|it| self.range.is_subrange(&it.range()))
+ .unwrap_or_else(|| panic!("can't resovle local ptr to SyntaxNode: {:?}", self))
+ }
+ }
+}
+
+
+#[test]
+fn test_local_syntax_ptr() {
+ let file = File::parse("struct Foo { f: u32, }");
+ let field = file.syntax().descendants().find_map(ast::NamedFieldDef::cast).unwrap();
+ let ptr = LocalSyntaxPtr::new(field.syntax());
+ let field_syntax = ptr.resolve(&file);
+ assert_eq!(field.syntax(), field_syntax);
+}