From 762819864fd78f2e8904a6bde6181b80895db360 Mon Sep 17 00:00:00 2001
From: Edwin Cheng <edwin0cheng@gmail.com>
Date: Fri, 19 Apr 2019 19:33:29 +0800
Subject: add block matcher

---
 crates/ra_mbe/src/lib.rs            | 19 +++++++++++++++++++
 crates/ra_mbe/src/mbe_expander.rs   |  5 +++++
 crates/ra_mbe/src/subtree_parser.rs |  4 ++++
 crates/ra_mbe/src/tt_cursor.rs      |  5 +++++
 4 files changed, 33 insertions(+)

(limited to 'crates/ra_mbe')

diff --git a/crates/ra_mbe/src/lib.rs b/crates/ra_mbe/src/lib.rs
index 8e3167e55..d7462d09d 100644
--- a/crates/ra_mbe/src/lib.rs
+++ b/crates/ra_mbe/src/lib.rs
@@ -743,4 +743,23 @@ MACRO_ITEMS@[0; 40)
         );
         assert_expansion(&rules, "foo! { { 1; } }", "fn foo () {1 ;}");
     }
+
+    #[test]
+    fn test_meta() {
+        let rules = create_rules(
+            r#"
+        macro_rules! foo {
+            ($ i:meta) => (
+                #[$ i]
+                fn bar() {}
+            )
+        }
+"#,
+        );
+        assert_expansion(
+            &rules,
+            r#"foo! { cfg(target_os = "windows") }"#,
+            r#"# [cfg (target_os = "windows")] fn bar () {}"#,
+        );
+    }
 }
diff --git a/crates/ra_mbe/src/mbe_expander.rs b/crates/ra_mbe/src/mbe_expander.rs
index a74e477d6..6ada580cc 100644
--- a/crates/ra_mbe/src/mbe_expander.rs
+++ b/crates/ra_mbe/src/mbe_expander.rs
@@ -166,6 +166,11 @@ fn match_lhs(pattern: &crate::Subtree, input: &mut TtCursor) -> Result<Bindings,
                                 input.eat_block().ok_or(ExpandError::UnexpectedToken)?.clone();
                             res.inner.insert(text.clone(), Binding::Simple(block.into()));
                         }
+                        "meta" => {
+                            let meta =
+                                input.eat_meta().ok_or(ExpandError::UnexpectedToken)?.clone();
+                            res.inner.insert(text.clone(), Binding::Simple(meta.into()));
+                        }
                         "item" => {
                             let item =
                                 input.eat_item().ok_or(ExpandError::UnexpectedToken)?.clone();
diff --git a/crates/ra_mbe/src/subtree_parser.rs b/crates/ra_mbe/src/subtree_parser.rs
index 2b11186c4..5d5557113 100644
--- a/crates/ra_mbe/src/subtree_parser.rs
+++ b/crates/ra_mbe/src/subtree_parser.rs
@@ -50,6 +50,10 @@ impl<'a> Parser<'a> {
         self.parse(ra_parser::parse_block)
     }
 
+    pub fn parse_meta(self) -> Option<tt::TokenTree> {
+        self.parse(ra_parser::parse_meta)
+    }
+
     pub fn parse_item(self) -> Option<tt::TokenTree> {
         self.parse(ra_parser::parse_item)
     }
diff --git a/crates/ra_mbe/src/tt_cursor.rs b/crates/ra_mbe/src/tt_cursor.rs
index d700aad69..04bb6b563 100644
--- a/crates/ra_mbe/src/tt_cursor.rs
+++ b/crates/ra_mbe/src/tt_cursor.rs
@@ -109,6 +109,11 @@ impl<'a> TtCursor<'a> {
         parser.parse_block()
     }
 
+    pub(crate) fn eat_meta(&mut self) -> Option<tt::TokenTree> {
+        let parser = Parser::new(&mut self.pos, self.subtree);
+        parser.parse_meta()
+    }
+
     pub(crate) fn eat_item(&mut self) -> Option<tt::TokenTree> {
         let parser = Parser::new(&mut self.pos, self.subtree);
         parser.parse_item()
-- 
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