Merge #1112

1112: Fix literal support in token tree to ast item list r=matklad a=edwin0cheng

This PR implements following things :

1. Expose `next_token` from `ra_parse`
2. Fix the literal conversion in `token_tree_to_ast_item_list`
3. Add test for the conversion

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

1 files changed, 9 insertions, 0 deletions

diff --git a/crates/ra_syntax/src/parsing/lexer.rs b/crates/ra_syntax/src/parsing/lexer.rs
index 36e841609..3ae42912c 100644
--- a/crates/ra_syntax/src/parsing/lexer.rs
+++ b/crates/ra_syntax/src/parsing/lexer.rs
@@ -214,3 +214,12 @@ fn scan_literal_suffix(ptr: &mut Ptr) {
     }
     ptr.bump_while(is_ident_continue);
 }
+
+pub fn classify_literal(text: &str) -> Option<Token> {
+    let tkn = next_token(text);
+    if !tkn.kind.is_literal() || tkn.len.to_usize() != text.len() {
+        return None;
+    }
+
+    Some(tkn)
+}