2 files changed, 50 insertions, 4 deletions

diff --git a/crates/ra_mbe/src/lib.rs b/crates/ra_mbe/src/lib.rs
index 38f0049ed..4203929d4 100644
--- a/crates/ra_mbe/src/lib.rs
+++ b/crates/ra_mbe/src/lib.rs
@@ -167,7 +167,7 @@ impl_froms!(TokenTree: Leaf, Subtree);
     )
     }
 
-    fn create_rules(macro_definition: &str) -> MacroRules {
+    pub(crate) fn create_rules(macro_definition: &str) -> MacroRules {
         let source_file = ast::SourceFile::parse(macro_definition);
         let macro_definition =
             source_file.syntax().descendants().find_map(ast::MacroCall::cast).unwrap();
@@ -176,7 +176,7 @@ impl_froms!(TokenTree: Leaf, Subtree);
         crate::MacroRules::parse(&definition_tt).unwrap()
     }
 
-    fn expand(rules: &MacroRules, invocation: &str) -> tt::Subtree {
+    pub(crate) fn expand(rules: &MacroRules, invocation: &str) -> tt::Subtree {
         let source_file = ast::SourceFile::parse(invocation);
         let macro_invocation =
             source_file.syntax().descendants().find_map(ast::MacroCall::cast).unwrap();
@@ -186,7 +186,7 @@ impl_froms!(TokenTree: Leaf, Subtree);
         rules.expand(&invocation_tt).unwrap()
     }
 
-    fn assert_expansion(rules: &MacroRules, invocation: &str, expansion: &str) {
+    pub(crate) fn assert_expansion(rules: &MacroRules, invocation: &str, expansion: &str) {
         let expanded = expand(rules, invocation);
         assert_eq!(expanded.to_string(), expansion);
     }
@@ -338,7 +338,7 @@ SOURCE_FILE@[0; 40)
     }
 
     #[test]
-    fn expand_literals_to_item_list() {
+    fn expand_literals_to_token_tree() {
         fn to_subtree(tt: &tt::TokenTree) -> &tt::Subtree {
             if let tt::TokenTree::Subtree(subtree) = tt {
                 return &subtree;
@@ -361,6 +361,7 @@ SOURCE_FILE@[0; 40)
                         let a = 'c';
                         let c = 1000;
                         let f = 12E+99_f64;
+                        let s = "rust1";
                     }
                 }
             }
@@ -375,5 +376,7 @@ SOURCE_FILE@[0; 40)
         assert_eq!(to_literal(&stm_tokens[5 + 3]).text, "1000");
         // [let] [f] [=] [12E+99_f64] [;]
         assert_eq!(to_literal(&stm_tokens[10 + 3]).text, "12E+99_f64");
+        // [let] [s] [=] ["rust1"] [;]
+        assert_eq!(to_literal(&stm_tokens[15 + 3]).text, "\"rust1\"");
     }
 }
diff --git a/crates/ra_mbe/src/syntax_bridge.rs b/crates/ra_mbe/src/syntax_bridge.rs
index 9664280b5..139a0fd33 100644
--- a/crates/ra_mbe/src/syntax_bridge.rs
+++ b/crates/ra_mbe/src/syntax_bridge.rs
@@ -103,10 +103,12 @@ fn convert_tt(
     Some(res)
 }
 
+#[derive(Debug)]
 struct TtTokenSource {
     tokens: Vec<TtToken>,
 }
 
+#[derive(Debug)]
 struct TtToken {
     kind: SyntaxKind,
     is_joint_to_next: bool,
@@ -355,3 +357,44 @@ impl<'a> TreeSink for TtTreeSink<'a> {
         self.inner.error(error, self.text_pos)
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::tests::{expand, create_rules};
+
+    #[test]
+    fn convert_tt_token_source() {
+        let rules = create_rules(
+            r#"
+            macro_rules! literals {
+                ($i:ident) => {
+                    {
+                        let a = 'c';
+                        let c = 1000;
+                        let f = 12E+99_f64;
+                        let s = "rust1";
+                    }
+                }
+            }
+            "#,
+        );
+        let expansion = expand(&rules, "literals!(foo)");
+        let tt_src = TtTokenSource::new(&expansion);
+
+        // [{]
+        // [let] [a] [=] ['c'] [;]
+        assert_eq!(tt_src.tokens[1 + 3].text, "'c'");
+        assert_eq!(tt_src.tokens[1 + 3].kind, CHAR);
+        // [let] [c] [=] [1000] [;]
+        assert_eq!(tt_src.tokens[1 + 5 + 3].text, "1000");
+        assert_eq!(tt_src.tokens[1 + 5 + 3].kind, INT_NUMBER);
+        // [let] [f] [=] [12E+99_f64] [;]
+        assert_eq!(tt_src.tokens[1 + 10 + 3].text, "12E+99_f64");
+        assert_eq!(tt_src.tokens[1 + 10 + 3].kind, FLOAT_NUMBER);
+
+        // [let] [s] [=] ["rust1"] [;]
+        assert_eq!(tt_src.tokens[1 + 15 + 3].text, "\"rust1\"");
+        assert_eq!(tt_src.tokens[1 + 15 + 3].kind, STRING);
+    }
+}