Switch to ungrammar from ast_src

The primary advantage of ungrammar is that it (eventually) allows one
to describe concrete syntax tree structure -- with alternatives and
specific sequence of tokens & nodes.

That should be re-usable for:

* generate `make` calls
* Rust reference
* Hypothetical parser's evented API

We loose doc comments for the time being unfortunately. I don't think
we should add support for doc comments to ungrammar -- they'll make
grammar file hard to read. We might supply docs as out-of band info,
or maybe just via a reference, but we'll think about that once things
are no longer in flux

1 files changed, 16 insertions, 0 deletions

diff --git a/crates/ra_syntax/src/ast/node_ext.rs b/crates/ra_syntax/src/ast/node_ext.rs
index 662c6f73e..242900643 100644
--- a/crates/ra_syntax/src/ast/node_ext.rs
+++ b/crates/ra_syntax/src/ast/node_ext.rs
@@ -472,3 +472,19 @@ impl ast::TokenTree {
             .filter(|it| matches!(it.kind(), T!['}'] | T![')'] | T![']']))
     }
 }
+
+impl ast::DocCommentsOwner for ast::SourceFile {}
+impl ast::DocCommentsOwner for ast::FnDef {}
+impl ast::DocCommentsOwner for ast::StructDef {}
+impl ast::DocCommentsOwner for ast::UnionDef {}
+impl ast::DocCommentsOwner for ast::RecordFieldDef {}
+impl ast::DocCommentsOwner for ast::TupleFieldDef {}
+impl ast::DocCommentsOwner for ast::EnumDef {}
+impl ast::DocCommentsOwner for ast::EnumVariant {}
+impl ast::DocCommentsOwner for ast::TraitDef {}
+impl ast::DocCommentsOwner for ast::Module {}
+impl ast::DocCommentsOwner for ast::StaticDef {}
+impl ast::DocCommentsOwner for ast::ConstDef {}
+impl ast::DocCommentsOwner for ast::TypeAliasDef {}
+impl ast::DocCommentsOwner for ast::ImplDef {}
+impl ast::DocCommentsOwner for ast::MacroCall {}