Merge #1168

1168: Add all remaining mbe matchers r=matklad a=edwin0cheng

This PR adds following  mbe matchers:

* block
* meta
* tt
* literal
* vis

Co-authored-by: Edwin Cheng <[email protected]>

1 files changed, 32 insertions, 1 deletions

diff --git a/crates/ra_parser/src/grammar.rs b/crates/ra_parser/src/grammar.rs
index e1762633e..67eae749d 100644
--- a/crates/ra_parser/src/grammar.rs
+++ b/crates/ra_parser/src/grammar.rs
@@ -95,6 +95,37 @@ pub(crate) fn stmt(p: &mut Parser, with_semi: bool) {
     expressions::stmt(p, with_semi)
 }
 
+pub(crate) fn block(p: &mut Parser) {
+    expressions::block(p);
+}
+
+// Parse a meta item , which excluded [], e.g : #[ MetaItem ]
+pub(crate) fn meta_item(p: &mut Parser) {
+    fn is_delimiter(p: &mut Parser) -> bool {
+        match p.current() {
+            L_CURLY | L_PAREN | L_BRACK => true,
+            _ => false,
+        }
+    }
+
+    if is_delimiter(p) {
+        items::token_tree(p);
+        return;
+    }
+
+    let m = p.start();
+    while !p.at(EOF) {
+        if is_delimiter(p) {
+            items::token_tree(p);
+            break;
+        } else {
+            p.bump();
+        }
+    }
+
+    m.complete(p, TOKEN_TREE);
+}
+
 pub(crate) fn item(p: &mut Parser) {
     items::item_or_macro(p, true, items::ItemFlavor::Mod)
 }
@@ -136,7 +167,7 @@ impl BlockLike {
     }
 }
 
-fn opt_visibility(p: &mut Parser) -> bool {
+pub(crate) fn opt_visibility(p: &mut Parser) -> bool {
     match p.current() {
         PUB_KW => {
             let m = p.start();