Finalize TypeBound grammar

Author: matklad

crates/ra_hir_def/src/generics.rs

@@ -270,7 +270,7 @@ impl GenericParams {
         bound: ast::TypeBound,
         type_ref: TypeRef,
     ) {
-        if bound.question_token().is_some() {
+        if bound.question_mark_token().is_some() {
             // FIXME: remove this bound
             return;
         }

crates/ra_syntax/src/ast/generated/nodes.rs

@@ -639,6 +639,17 @@ impl DynTraitType {
     pub fn type_bound_list(&self) -> Option<TypeBoundList> { support::child(&self.syntax) }
 }
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct TypeBound {
+    pub(crate) syntax: SyntaxNode,
+}
+impl TypeBound {
+    pub fn lifetime_token(&self) -> Option<SyntaxToken> {
+        support::token(&self.syntax, T![lifetime])
+    }
+    pub fn question_mark_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![?]) }
+    pub fn ty(&self) -> Option<Type> { support::child(&self.syntax) }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
 pub struct TupleExpr {
     pub(crate) syntax: SyntaxNode,
 }
@@ -1168,17 +1179,6 @@ impl MacroStmts {
     pub fn expr(&self) -> Option<Expr> { support::child(&self.syntax) }
 }
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
-pub struct TypeBound {
-    pub(crate) syntax: SyntaxNode,
-}
-impl TypeBound {
-    pub fn lifetime_token(&self) -> Option<SyntaxToken> {
-        support::token(&self.syntax, T![lifetime])
-    }
-    pub fn const_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![const]) }
-    pub fn ty(&self) -> Option<Type> { support::child(&self.syntax) }
-}
-#[derive(Debug, Clone, PartialEq, Eq, Hash)]
 pub struct WherePred {
     pub(crate) syntax: SyntaxNode,
 }
@@ -2045,6 +2045,17 @@ impl AstNode for DynTraitType {
     }
     fn syntax(&self) -> &SyntaxNode { &self.syntax }
 }
+impl AstNode for TypeBound {
+    fn can_cast(kind: SyntaxKind) -> bool { kind == TYPE_BOUND }
+    fn cast(syntax: SyntaxNode) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxNode { &self.syntax }
+}
 impl AstNode for TupleExpr {
     fn can_cast(kind: SyntaxKind) -> bool { kind == TUPLE_EXPR }
     fn cast(syntax: SyntaxNode) -> Option<Self> {
@@ -2661,17 +2672,6 @@ impl AstNode for MacroStmts {
     }
     fn syntax(&self) -> &SyntaxNode { &self.syntax }
 }
-impl AstNode for TypeBound {
-    fn can_cast(kind: SyntaxKind) -> bool { kind == TYPE_BOUND }
-    fn cast(syntax: SyntaxNode) -> Option<Self> {
-        if Self::can_cast(syntax.kind()) {
-            Some(Self { syntax })
-        } else {
-            None
-        }
-    }
-    fn syntax(&self) -> &SyntaxNode { &self.syntax }
-}
 impl AstNode for WherePred {
     fn can_cast(kind: SyntaxKind) -> bool { kind == WHERE_PRED }
     fn cast(syntax: SyntaxNode) -> Option<Self> {
@@ -3746,6 +3746,11 @@ impl std::fmt::Display for DynTraitType {
         std::fmt::Display::fmt(self.syntax(), f)
     }
 }
+impl std::fmt::Display for TypeBound {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        std::fmt::Display::fmt(self.syntax(), f)
+    }
+}
 impl std::fmt::Display for TupleExpr {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         std::fmt::Display::fmt(self.syntax(), f)
@@ -4026,11 +4031,6 @@ impl std::fmt::Display for MacroStmts {
         std::fmt::Display::fmt(self.syntax(), f)
     }
 }
-impl std::fmt::Display for TypeBound {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        std::fmt::Display::fmt(self.syntax(), f)
-    }
-}
 impl std::fmt::Display for WherePred {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         std::fmt::Display::fmt(self.syntax(), f)

crates/ra_syntax/src/ast/node_ext.rs

@@ -362,26 +362,6 @@ impl ast::TypeBound {
             unreachable!()
         }
     }
-
-    pub fn const_question_token(&self) -> Option<SyntaxToken> {
-        self.syntax()
-            .children_with_tokens()
-            .filter_map(|it| it.into_token())
-            .take_while(|it| it.kind() != T![const])
-            .find(|it| it.kind() == T![?])
-    }
-
-    pub fn question_token(&self) -> Option<SyntaxToken> {
-        if self.const_token().is_some() {
-            self.syntax()
-                .children_with_tokens()
-                .filter_map(|it| it.into_token())
-                .skip_while(|it| it.kind() != T![const])
-                .find(|it| it.kind() == T![?])
-        } else {
-            support::token(&self.syntax, T![?])
-        }
-    }
 }
 
 pub enum VisibilityKind {

xtask/src/codegen/rust.ungram

@@ -242,6 +242,13 @@ ImplTraitType =
 DynTraitType =
   'dyn' TypeBoundList
 
+TypeBoundList =
+   bounds:(TypeBound ('+' TypeBound)* '+'?)
+
+TypeBound =
+  'lifetime'
+| '?'? Type
+
 TupleExpr =
   Attr* '(' Expr* ')'
 
@@ -443,12 +450,6 @@ MacroStmts =
   statements:Stmt*
   Expr?
 
-TypeBound =
-  'lifetime' | 'const'? Type
-
-TypeBoundList =
-   bounds:TypeBound*
-
 WherePred =
   ('for' GenericParamList)?  ('lifetime' | Type) ':' TypeBoundList