From ca327f35addd2be36f2463f28c7fc044e5f7cf55 Mon Sep 17 00:00:00 2001
From: Aleksey Kladov <aleksey.kladov@gmail.com>
Date: Wed, 30 Jan 2019 23:17:32 +0300
Subject: add macro by example ide

---
 crates/ra_hir/src/macros.rs     |  2 ++
 crates/ra_hir/src/macros/mbe.rs | 50 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 52 insertions(+)
 create mode 100644 crates/ra_hir/src/macros/mbe.rs

diff --git a/crates/ra_hir/src/macros.rs b/crates/ra_hir/src/macros.rs
index 5ad5cf51f..6190b2c08 100644
--- a/crates/ra_hir/src/macros.rs
+++ b/crates/ra_hir/src/macros.rs
@@ -1,5 +1,7 @@
 #[allow(unused)]
 mod tt;
+#[allow(unused)]
+mod mbe;
 
 /// Machinery for macro expansion.
 ///
diff --git a/crates/ra_hir/src/macros/mbe.rs b/crates/ra_hir/src/macros/mbe.rs
new file mode 100644
index 000000000..5c1771a15
--- /dev/null
+++ b/crates/ra_hir/src/macros/mbe.rs
@@ -0,0 +1,50 @@
+use ra_syntax::SmolStr;
+
+struct MacroRules {
+    rules: Vec<Rule>,
+}
+
+struct Rule {
+    lhs: TokenTree,
+    rhs: TokenTree,
+}
+
+enum TokenTree {
+    Leaf(Leaf),
+    Subtree(Subtree),
+}
+
+enum Leaf {
+    Literal(Literal),
+    Punct(Punct),
+    Ident(Ident),
+    Var(Var),
+}
+
+struct Subtree {
+    delimiter: Delimiter,
+    token_trees: Vec<TokenTree>,
+}
+
+enum Delimiter {
+    Parenthesis,
+    Brace,
+    Bracket,
+    None,
+}
+
+struct Literal {
+    text: SmolStr,
+}
+
+struct Punct {
+    char: char,
+}
+
+struct Ident {
+    text: SmolStr,
+}
+
+struct Var {
+    text: SmolStr,
+}
-- 
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