Add tests for float access macro call inputs

crates/hir-def/src/macro_expansion_tests/mbe.rs

@@ -97,6 +97,41 @@ fn#19 main#20(#21)#21 {#22
 "##]],
     );
 }
+#[test]
+fn float_field_acces_macro_input() {
+    check(
+        r#"
+macro_rules! foo {
+    ($expr:expr) => {
+        fn foo() {
+            $expr;
+        }
+    };
+}
+foo!(x .0.1);
+foo!(x .2. 3);
+foo!(x .4 .5);
+"#,
+        expect![[r#"
+macro_rules! foo {
+    ($expr:expr) => {
+        fn foo() {
+            $expr;
+        }
+    };
+}
+fn foo() {
+    (x.0.1);
+}
+fn foo() {
+    (x.2.3);
+}
+fn foo() {
+    (x.4.5);
+}
+"#]],
+    );
+}
 
 #[test]
 fn mbe_smoke_test() {

crates/mbe/src/syntax_bridge.rs

@@ -817,7 +817,7 @@ impl<'a> TtTreeSink<'a> {
                 self.inner.token(SyntaxKind::DOT, ".");
 
                 if has_pseudo_dot {
-                    assert!(right.is_empty());
+                    assert!(right.is_empty(), "{left}.{right}");
                 } else {
                     self.inner.start_node(SyntaxKind::NAME_REF);
                     self.inner.token(SyntaxKind::INT_NUMBER, right);

crates/mbe/src/to_parser_input.rs

@@ -45,6 +45,10 @@ pub(crate) fn to_parser_input(buffer: &TokenBuffer<'_>) -> parser::Input {
                             .unwrap_or_else(|| panic!("Fail to convert given literal {:#?}", &lit));
 
                         res.push(kind);
+
+                        if kind == FLOAT_NUMBER && !inner_text.ends_with('.') {
+                            res.was_joint();
+                        }
                     }
                     tt::Leaf::Ident(ident) => match ident.text.as_ref() {
                         "_" => res.push(T![_]),

crates/mbe/src/tt_iter.rs

@@ -140,7 +140,6 @@ impl<'a> TtIter<'a> {
 
         let mut cursor = buffer.begin();
         let mut error = false;
-        let mut float_splits = vec![];
         for step in tree_traversal.iter() {
             match step {
                 parser::Step::Token { kind, mut n_input_tokens } => {
@@ -152,7 +151,8 @@ impl<'a> TtIter<'a> {
                     }
                 }
                 parser::Step::FloatSplit { .. } => {
-                    float_splits.push(cursor);
+                    // FIXME: We need to split the tree properly here, but mutating the token trees
+                    // in the buffer is somewhat tricky to pull off.
                     cursor = cursor.bump_subtree();
                 }
                 parser::Step::Enter { .. } | parser::Step::Exit => (),
@@ -170,40 +170,13 @@ impl<'a> TtIter<'a> {
         let mut res = vec![];
 
         if cursor.is_root() {
-            if float_splits.is_empty() {
+            while curr != cursor {
-                while curr != cursor {
+                let Some(token) = curr.token_tree() else { break };
-                    if let Some(token) = curr.token_tree() {
+                res.push(token.cloned());
-                        res.push(token.cloned());
+                curr = curr.bump();
-                    }
-                    curr = curr.bump();
-                }
-            } else {
-                // let mut float_splits = float_splits.into_iter().peekable();
-                // while let Some(tt) = curr.token_tree() {
-                //     let mut tt = tt.cloned();
-                //     let mut tt_mut_ref = &mut tt;
-                //     if let Some(fs) = float_splits.peek() {
-                //         loop {
-                //             curr = curr.bump_subtree();
-                //             if curr == *fs {
-                //                 float_splits.next();
-                //             }
-                //             if curr.is_root() {
-                //                 break;
-                //             }
-                //         }
-                //     }
-                //     res.push(tt);
-                // }
-
-                while curr != cursor {
-                    if let Some(token) = curr.token_tree() {
-                        res.push(token.cloned());
-                    }
-                    curr = curr.bump();
-                }
             }
         }
+
         self.inner = self.inner.as_slice()[res.len()..].iter();
         let res = match res.len() {
             0 | 1 => res.pop(),

crates/tt/src/buffer.rs

@@ -7,7 +7,12 @@ use crate::{Leaf, Subtree, TokenTree};
 struct EntryId(usize);
 
 #[derive(Copy, Clone, Debug, Eq, PartialEq)]
-struct EntryPtr(EntryId, usize);
+struct EntryPtr(
+    /// The index of the buffer containing the entry.
+    EntryId,
+    /// The index of the entry within the buffer.
+    usize,
+);
 
 /// Internal type which is used instead of `TokenTree` to represent a token tree
 /// within a `TokenBuffer`.
@@ -229,7 +234,11 @@ impl<'a, Span> Cursor<'a, Span> {
             Some(&Entry::Subtree(_, _, entry_id)) => {
                 Cursor::create(self.buffer, EntryPtr(entry_id, 0))
             }
-            _ => self.bump(),
+            Some(Entry::End(exit)) => match exit {
+                Some(exit) => Cursor::create(self.buffer, *exit),
+                None => self,
+            },
+            _ => Cursor::create(self.buffer, EntryPtr(self.ptr.0, self.ptr.1 + 1)),
         }
     }