3 files changed, 35 insertions, 3 deletions

diff --git a/src/ast.rs b/src/ast.rs
new file mode 100644
index 000000000..3a9287466
--- /dev/null
+++ b/src/ast.rs
@@ -0,0 +1,30 @@
+use std::sync::Arc;
+use {SyntaxNode, TreeRoot, SyntaxRoot, SyntaxNodeRef};
+
+#[derive(Debug)]
+pub struct File<R: TreeRoot = Arc<SyntaxRoot>> {
+    syntax: SyntaxNode<R>
+}
+
+impl File<Arc<SyntaxRoot>> {
+    pub fn parse(text: &str) -> Self {
+        File { syntax: ::parse(text.to_owned()) }
+    }
+}
+
+impl<R: TreeRoot> File<R> {
+    pub fn syntax(&self) -> SyntaxNode<R> {
+        self.syntax.clone()
+    }
+
+    pub fn for_each_node(&self, mut f: impl FnMut(SyntaxNodeRef)) {
+        let syntax = self.syntax();
+        let syntax = syntax.borrow();
+        go(syntax, &mut f);
+
+        fn go(syntax: SyntaxNodeRef, f: &mut FnMut(SyntaxNodeRef)) {
+            f(syntax);
+            syntax.children().into_iter().for_each(f)
+        }
+    }
+}
diff --git a/src/lib.rs b/src/lib.rs
index f85ee1eef..3a8e6fa64 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -29,12 +29,14 @@ mod syntax_kinds;
 mod yellow;
 /// Utilities for simple uses of the parser.
 pub mod utils;
+pub mod ast;
 
 pub use {
     lexer::{tokenize, Token},
     syntax_kinds::SyntaxKind,
     text_unit::{TextRange, TextUnit},
-    yellow::{SyntaxNode, SyntaxNodeRef},
+    yellow::{SyntaxNode, SyntaxNodeRef, TreeRoot, SyntaxRoot},
+    ast::File,
 };
 
 pub(crate) use yellow::SyntaxError;
diff --git a/src/yellow/mod.rs b/src/yellow/mod.rs
index cada65d2f..0cc90adbd 100644
--- a/src/yellow/mod.rs
+++ b/src/yellow/mod.rs
@@ -3,10 +3,10 @@ mod green;
 mod red;
 mod syntax;
 
-pub use self::syntax::{SyntaxNode, SyntaxNodeRef};
+pub use self::syntax::{SyntaxNode, SyntaxNodeRef, SyntaxRoot, TreeRoot};
 pub(crate) use self::{
     builder::GreenBuilder,
     green::{GreenNode, GreenNodeBuilder},
     red::RedNode,
-    syntax::{SyntaxError, SyntaxRoot},
+    syntax::{SyntaxError},
 };