| // Copyright 2012-2015 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| //! AST walker. Each overridden visit method has full control over what |
| //! happens with its node, it can do its own traversal of the node's children, |
| //! call `visit::walk_*` to apply the default traversal algorithm, or prevent |
| //! deeper traversal by doing nothing. |
| //! |
| //! Note: it is an important invariant that the default visitor walks the body |
| //! of a function in "execution order" (more concretely, reverse post-order |
| //! with respect to the CFG implied by the AST), meaning that if AST node A may |
| //! execute before AST node B, then A is visited first. The borrow checker in |
| //! particular relies on this property. |
| //! |
| //! Note: walking an AST before macro expansion is probably a bad idea. For |
| //! instance, a walker looking for item names in a module will miss all of |
| //! those that are created by the expansion of a macro. |
| |
| use abi::Abi; |
| use ast::*; |
| use syntax_pos::Span; |
| use codemap::Spanned; |
| |
| #[derive(Copy, Clone, PartialEq, Eq)] |
| pub enum FnKind<'a> { |
| /// fn foo() or extern "Abi" fn foo() |
| ItemFn(Ident, &'a Generics, Unsafety, Constness, Abi, &'a Visibility), |
| |
| /// fn foo(&self) |
| Method(Ident, &'a MethodSig, Option<&'a Visibility>), |
| |
| /// |x, y| {} |
| Closure, |
| } |
| |
| /// Each method of the Visitor trait is a hook to be potentially |
| /// overridden. Each method's default implementation recursively visits |
| /// the substructure of the input via the corresponding `walk` method; |
| /// e.g. the `visit_mod` method by default calls `visit::walk_mod`. |
| /// |
| /// If you want to ensure that your code handles every variant |
| /// explicitly, you need to override each method. (And you also need |
| /// to monitor future changes to `Visitor` in case a new method with a |
| /// new default implementation gets introduced.) |
| pub trait Visitor: Sized { |
| fn visit_name(&mut self, _span: Span, _name: Name) { |
| // Nothing to do. |
| } |
| fn visit_ident(&mut self, span: Span, ident: Ident) { |
| walk_ident(self, span, ident); |
| } |
| fn visit_mod(&mut self, m: &Mod, _s: Span, _n: NodeId) { walk_mod(self, m) } |
| fn visit_foreign_item(&mut self, i: &ForeignItem) { walk_foreign_item(self, i) } |
| fn visit_item(&mut self, i: &Item) { walk_item(self, i) } |
| fn visit_local(&mut self, l: &Local) { walk_local(self, l) } |
| fn visit_block(&mut self, b: &Block) { walk_block(self, b) } |
| fn visit_stmt(&mut self, s: &Stmt) { walk_stmt(self, s) } |
| fn visit_arm(&mut self, a: &Arm) { walk_arm(self, a) } |
| fn visit_pat(&mut self, p: &Pat) { walk_pat(self, p) } |
| fn visit_expr(&mut self, ex: &Expr) { walk_expr(self, ex) } |
| fn visit_expr_post(&mut self, _ex: &Expr) { } |
| fn visit_ty(&mut self, t: &Ty) { walk_ty(self, t) } |
| fn visit_generics(&mut self, g: &Generics) { walk_generics(self, g) } |
| fn visit_fn(&mut self, fk: FnKind, fd: &FnDecl, b: &Block, s: Span, _: NodeId) { |
| walk_fn(self, fk, fd, b, s) |
| } |
| fn visit_trait_item(&mut self, ti: &TraitItem) { walk_trait_item(self, ti) } |
| fn visit_impl_item(&mut self, ii: &ImplItem) { walk_impl_item(self, ii) } |
| fn visit_trait_ref(&mut self, t: &TraitRef) { walk_trait_ref(self, t) } |
| fn visit_ty_param_bound(&mut self, bounds: &TyParamBound) { |
| walk_ty_param_bound(self, bounds) |
| } |
| fn visit_poly_trait_ref(&mut self, t: &PolyTraitRef, m: &TraitBoundModifier) { |
| walk_poly_trait_ref(self, t, m) |
| } |
| fn visit_variant_data(&mut self, s: &VariantData, _: Ident, |
| _: &Generics, _: NodeId, _: Span) { |
| walk_struct_def(self, s) |
| } |
| fn visit_struct_field(&mut self, s: &StructField) { walk_struct_field(self, s) } |
| fn visit_enum_def(&mut self, enum_definition: &EnumDef, |
| generics: &Generics, item_id: NodeId, _: Span) { |
| walk_enum_def(self, enum_definition, generics, item_id) |
| } |
| fn visit_variant(&mut self, v: &Variant, g: &Generics, item_id: NodeId) { |
| walk_variant(self, v, g, item_id) |
| } |
| fn visit_lifetime(&mut self, lifetime: &Lifetime) { |
| walk_lifetime(self, lifetime) |
| } |
| fn visit_lifetime_def(&mut self, lifetime: &LifetimeDef) { |
| walk_lifetime_def(self, lifetime) |
| } |
| fn visit_mac(&mut self, _mac: &Mac) { |
| panic!("visit_mac disabled by default"); |
| // NB: see note about macros above. |
| // if you really want a visitor that |
| // works on macros, use this |
| // definition in your trait impl: |
| // visit::walk_mac(self, _mac) |
| } |
| fn visit_path(&mut self, path: &Path, _id: NodeId) { |
| walk_path(self, path) |
| } |
| fn visit_path_list_item(&mut self, prefix: &Path, item: &PathListItem) { |
| walk_path_list_item(self, prefix, item) |
| } |
| fn visit_path_segment(&mut self, path_span: Span, path_segment: &PathSegment) { |
| walk_path_segment(self, path_span, path_segment) |
| } |
| fn visit_path_parameters(&mut self, path_span: Span, path_parameters: &PathParameters) { |
| walk_path_parameters(self, path_span, path_parameters) |
| } |
| fn visit_assoc_type_binding(&mut self, type_binding: &TypeBinding) { |
| walk_assoc_type_binding(self, type_binding) |
| } |
| fn visit_attribute(&mut self, _attr: &Attribute) {} |
| fn visit_macro_def(&mut self, macro_def: &MacroDef) { |
| walk_macro_def(self, macro_def) |
| } |
| fn visit_vis(&mut self, vis: &Visibility) { |
| walk_vis(self, vis) |
| } |
| } |
| |
| #[macro_export] |
| macro_rules! walk_list { |
| ($visitor: expr, $method: ident, $list: expr) => { |
| for elem in $list { |
| $visitor.$method(elem) |
| } |
| }; |
| ($visitor: expr, $method: ident, $list: expr, $($extra_args: expr),*) => { |
| for elem in $list { |
| $visitor.$method(elem, $($extra_args,)*) |
| } |
| } |
| } |
| |
| pub fn walk_opt_name<V: Visitor>(visitor: &mut V, span: Span, opt_name: Option<Name>) { |
| if let Some(name) = opt_name { |
| visitor.visit_name(span, name); |
| } |
| } |
| |
| pub fn walk_opt_ident<V: Visitor>(visitor: &mut V, span: Span, opt_ident: Option<Ident>) { |
| if let Some(ident) = opt_ident { |
| visitor.visit_ident(span, ident); |
| } |
| } |
| |
| pub fn walk_opt_sp_ident<V: Visitor>(visitor: &mut V, opt_sp_ident: &Option<Spanned<Ident>>) { |
| if let Some(ref sp_ident) = *opt_sp_ident { |
| visitor.visit_ident(sp_ident.span, sp_ident.node); |
| } |
| } |
| |
| pub fn walk_ident<V: Visitor>(visitor: &mut V, span: Span, ident: Ident) { |
| visitor.visit_name(span, ident.name); |
| } |
| |
| pub fn walk_crate<V: Visitor>(visitor: &mut V, krate: &Crate) { |
| visitor.visit_mod(&krate.module, krate.span, CRATE_NODE_ID); |
| walk_list!(visitor, visit_attribute, &krate.attrs); |
| walk_list!(visitor, visit_macro_def, &krate.exported_macros); |
| } |
| |
| pub fn walk_macro_def<V: Visitor>(visitor: &mut V, macro_def: &MacroDef) { |
| visitor.visit_ident(macro_def.span, macro_def.ident); |
| walk_opt_ident(visitor, macro_def.span, macro_def.imported_from); |
| walk_list!(visitor, visit_attribute, ¯o_def.attrs); |
| } |
| |
| pub fn walk_mod<V: Visitor>(visitor: &mut V, module: &Mod) { |
| walk_list!(visitor, visit_item, &module.items); |
| } |
| |
| pub fn walk_local<V: Visitor>(visitor: &mut V, local: &Local) { |
| for attr in local.attrs.iter() { |
| visitor.visit_attribute(attr); |
| } |
| visitor.visit_pat(&local.pat); |
| walk_list!(visitor, visit_ty, &local.ty); |
| walk_list!(visitor, visit_expr, &local.init); |
| } |
| |
| pub fn walk_lifetime<V: Visitor>(visitor: &mut V, lifetime: &Lifetime) { |
| visitor.visit_name(lifetime.span, lifetime.name); |
| } |
| |
| pub fn walk_lifetime_def<V: Visitor>(visitor: &mut V, lifetime_def: &LifetimeDef) { |
| visitor.visit_lifetime(&lifetime_def.lifetime); |
| walk_list!(visitor, visit_lifetime, &lifetime_def.bounds); |
| } |
| |
| pub fn walk_poly_trait_ref<V>(visitor: &mut V, trait_ref: &PolyTraitRef, _: &TraitBoundModifier) |
| where V: Visitor, |
| { |
| walk_list!(visitor, visit_lifetime_def, &trait_ref.bound_lifetimes); |
| visitor.visit_trait_ref(&trait_ref.trait_ref); |
| } |
| |
| pub fn walk_trait_ref<V: Visitor>(visitor: &mut V, trait_ref: &TraitRef) { |
| visitor.visit_path(&trait_ref.path, trait_ref.ref_id) |
| } |
| |
| pub fn walk_item<V: Visitor>(visitor: &mut V, item: &Item) { |
| visitor.visit_vis(&item.vis); |
| visitor.visit_ident(item.span, item.ident); |
| match item.node { |
| ItemKind::ExternCrate(opt_name) => { |
| walk_opt_name(visitor, item.span, opt_name) |
| } |
| ItemKind::Use(ref vp) => { |
| match vp.node { |
| ViewPathSimple(ident, ref path) => { |
| visitor.visit_ident(vp.span, ident); |
| visitor.visit_path(path, item.id); |
| } |
| ViewPathGlob(ref path) => { |
| visitor.visit_path(path, item.id); |
| } |
| ViewPathList(ref prefix, ref list) => { |
| visitor.visit_path(prefix, item.id); |
| for item in list { |
| visitor.visit_path_list_item(prefix, item) |
| } |
| } |
| } |
| } |
| ItemKind::Static(ref typ, _, ref expr) | |
| ItemKind::Const(ref typ, ref expr) => { |
| visitor.visit_ty(typ); |
| visitor.visit_expr(expr); |
| } |
| ItemKind::Fn(ref declaration, unsafety, constness, abi, ref generics, ref body) => { |
| visitor.visit_fn(FnKind::ItemFn(item.ident, generics, unsafety, |
| constness, abi, &item.vis), |
| declaration, |
| body, |
| item.span, |
| item.id) |
| } |
| ItemKind::Mod(ref module) => { |
| visitor.visit_mod(module, item.span, item.id) |
| } |
| ItemKind::ForeignMod(ref foreign_module) => { |
| walk_list!(visitor, visit_foreign_item, &foreign_module.items); |
| } |
| ItemKind::Ty(ref typ, ref type_parameters) => { |
| visitor.visit_ty(typ); |
| visitor.visit_generics(type_parameters) |
| } |
| ItemKind::Enum(ref enum_definition, ref type_parameters) => { |
| visitor.visit_generics(type_parameters); |
| visitor.visit_enum_def(enum_definition, type_parameters, item.id, item.span) |
| } |
| ItemKind::DefaultImpl(_, ref trait_ref) => { |
| visitor.visit_trait_ref(trait_ref) |
| } |
| ItemKind::Impl(_, _, |
| ref type_parameters, |
| ref opt_trait_reference, |
| ref typ, |
| ref impl_items) => { |
| visitor.visit_generics(type_parameters); |
| walk_list!(visitor, visit_trait_ref, opt_trait_reference); |
| visitor.visit_ty(typ); |
| walk_list!(visitor, visit_impl_item, impl_items); |
| } |
| ItemKind::Struct(ref struct_definition, ref generics) => { |
| visitor.visit_generics(generics); |
| visitor.visit_variant_data(struct_definition, item.ident, |
| generics, item.id, item.span); |
| } |
| ItemKind::Trait(_, ref generics, ref bounds, ref methods) => { |
| visitor.visit_generics(generics); |
| walk_list!(visitor, visit_ty_param_bound, bounds); |
| walk_list!(visitor, visit_trait_item, methods); |
| } |
| ItemKind::Mac(ref mac) => visitor.visit_mac(mac), |
| } |
| walk_list!(visitor, visit_attribute, &item.attrs); |
| } |
| |
| pub fn walk_enum_def<V: Visitor>(visitor: &mut V, |
| enum_definition: &EnumDef, |
| generics: &Generics, |
| item_id: NodeId) { |
| walk_list!(visitor, visit_variant, &enum_definition.variants, generics, item_id); |
| } |
| |
| pub fn walk_variant<V>(visitor: &mut V, variant: &Variant, generics: &Generics, item_id: NodeId) |
| where V: Visitor, |
| { |
| visitor.visit_ident(variant.span, variant.node.name); |
| visitor.visit_variant_data(&variant.node.data, variant.node.name, |
| generics, item_id, variant.span); |
| walk_list!(visitor, visit_expr, &variant.node.disr_expr); |
| walk_list!(visitor, visit_attribute, &variant.node.attrs); |
| } |
| |
| pub fn walk_ty<V: Visitor>(visitor: &mut V, typ: &Ty) { |
| match typ.node { |
| TyKind::Vec(ref ty) | TyKind::Paren(ref ty) => { |
| visitor.visit_ty(ty) |
| } |
| TyKind::Ptr(ref mutable_type) => { |
| visitor.visit_ty(&mutable_type.ty) |
| } |
| TyKind::Rptr(ref opt_lifetime, ref mutable_type) => { |
| walk_list!(visitor, visit_lifetime, opt_lifetime); |
| visitor.visit_ty(&mutable_type.ty) |
| } |
| TyKind::Tup(ref tuple_element_types) => { |
| walk_list!(visitor, visit_ty, tuple_element_types); |
| } |
| TyKind::BareFn(ref function_declaration) => { |
| walk_fn_decl(visitor, &function_declaration.decl); |
| walk_list!(visitor, visit_lifetime_def, &function_declaration.lifetimes); |
| } |
| TyKind::Path(ref maybe_qself, ref path) => { |
| if let Some(ref qself) = *maybe_qself { |
| visitor.visit_ty(&qself.ty); |
| } |
| visitor.visit_path(path, typ.id); |
| } |
| TyKind::ObjectSum(ref ty, ref bounds) => { |
| visitor.visit_ty(ty); |
| walk_list!(visitor, visit_ty_param_bound, bounds); |
| } |
| TyKind::FixedLengthVec(ref ty, ref expression) => { |
| visitor.visit_ty(ty); |
| visitor.visit_expr(expression) |
| } |
| TyKind::PolyTraitRef(ref bounds) => { |
| walk_list!(visitor, visit_ty_param_bound, bounds); |
| } |
| TyKind::Typeof(ref expression) => { |
| visitor.visit_expr(expression) |
| } |
| TyKind::Infer | TyKind::ImplicitSelf => {} |
| TyKind::Mac(ref mac) => { |
| visitor.visit_mac(mac) |
| } |
| } |
| } |
| |
| pub fn walk_path<V: Visitor>(visitor: &mut V, path: &Path) { |
| for segment in &path.segments { |
| visitor.visit_path_segment(path.span, segment); |
| } |
| } |
| |
| pub fn walk_path_list_item<V: Visitor>(visitor: &mut V, _prefix: &Path, item: &PathListItem) { |
| walk_opt_ident(visitor, item.span, item.node.name()); |
| walk_opt_ident(visitor, item.span, item.node.rename()); |
| } |
| |
| pub fn walk_path_segment<V: Visitor>(visitor: &mut V, path_span: Span, segment: &PathSegment) { |
| visitor.visit_ident(path_span, segment.identifier); |
| visitor.visit_path_parameters(path_span, &segment.parameters); |
| } |
| |
| pub fn walk_path_parameters<V>(visitor: &mut V, _path_span: Span, path_parameters: &PathParameters) |
| where V: Visitor, |
| { |
| match *path_parameters { |
| PathParameters::AngleBracketed(ref data) => { |
| walk_list!(visitor, visit_ty, &data.types); |
| walk_list!(visitor, visit_lifetime, &data.lifetimes); |
| walk_list!(visitor, visit_assoc_type_binding, &data.bindings); |
| } |
| PathParameters::Parenthesized(ref data) => { |
| walk_list!(visitor, visit_ty, &data.inputs); |
| walk_list!(visitor, visit_ty, &data.output); |
| } |
| } |
| } |
| |
| pub fn walk_assoc_type_binding<V: Visitor>(visitor: &mut V, type_binding: &TypeBinding) { |
| visitor.visit_ident(type_binding.span, type_binding.ident); |
| visitor.visit_ty(&type_binding.ty); |
| } |
| |
| pub fn walk_pat<V: Visitor>(visitor: &mut V, pattern: &Pat) { |
| match pattern.node { |
| PatKind::TupleStruct(ref path, ref children, _) => { |
| visitor.visit_path(path, pattern.id); |
| walk_list!(visitor, visit_pat, children); |
| } |
| PatKind::Path(ref opt_qself, ref path) => { |
| if let Some(ref qself) = *opt_qself { |
| visitor.visit_ty(&qself.ty); |
| } |
| visitor.visit_path(path, pattern.id) |
| } |
| PatKind::Struct(ref path, ref fields, _) => { |
| visitor.visit_path(path, pattern.id); |
| for field in fields { |
| visitor.visit_ident(field.span, field.node.ident); |
| visitor.visit_pat(&field.node.pat) |
| } |
| } |
| PatKind::Tuple(ref tuple_elements, _) => { |
| walk_list!(visitor, visit_pat, tuple_elements); |
| } |
| PatKind::Box(ref subpattern) | |
| PatKind::Ref(ref subpattern, _) => { |
| visitor.visit_pat(subpattern) |
| } |
| PatKind::Ident(_, ref pth1, ref optional_subpattern) => { |
| visitor.visit_ident(pth1.span, pth1.node); |
| walk_list!(visitor, visit_pat, optional_subpattern); |
| } |
| PatKind::Lit(ref expression) => visitor.visit_expr(expression), |
| PatKind::Range(ref lower_bound, ref upper_bound) => { |
| visitor.visit_expr(lower_bound); |
| visitor.visit_expr(upper_bound) |
| } |
| PatKind::Wild => (), |
| PatKind::Vec(ref prepatterns, ref slice_pattern, ref postpatterns) => { |
| walk_list!(visitor, visit_pat, prepatterns); |
| walk_list!(visitor, visit_pat, slice_pattern); |
| walk_list!(visitor, visit_pat, postpatterns); |
| } |
| PatKind::Mac(ref mac) => visitor.visit_mac(mac), |
| } |
| } |
| |
| pub fn walk_foreign_item<V: Visitor>(visitor: &mut V, foreign_item: &ForeignItem) { |
| visitor.visit_vis(&foreign_item.vis); |
| visitor.visit_ident(foreign_item.span, foreign_item.ident); |
| |
| match foreign_item.node { |
| ForeignItemKind::Fn(ref function_declaration, ref generics) => { |
| walk_fn_decl(visitor, function_declaration); |
| visitor.visit_generics(generics) |
| } |
| ForeignItemKind::Static(ref typ, _) => visitor.visit_ty(typ), |
| } |
| |
| walk_list!(visitor, visit_attribute, &foreign_item.attrs); |
| } |
| |
| pub fn walk_ty_param_bound<V: Visitor>(visitor: &mut V, bound: &TyParamBound) { |
| match *bound { |
| TraitTyParamBound(ref typ, ref modifier) => { |
| visitor.visit_poly_trait_ref(typ, modifier); |
| } |
| RegionTyParamBound(ref lifetime) => { |
| visitor.visit_lifetime(lifetime); |
| } |
| } |
| } |
| |
| pub fn walk_generics<V: Visitor>(visitor: &mut V, generics: &Generics) { |
| for param in &generics.ty_params { |
| visitor.visit_ident(param.span, param.ident); |
| walk_list!(visitor, visit_ty_param_bound, ¶m.bounds); |
| walk_list!(visitor, visit_ty, ¶m.default); |
| } |
| walk_list!(visitor, visit_lifetime_def, &generics.lifetimes); |
| for predicate in &generics.where_clause.predicates { |
| match *predicate { |
| WherePredicate::BoundPredicate(WhereBoundPredicate{ref bounded_ty, |
| ref bounds, |
| ref bound_lifetimes, |
| ..}) => { |
| visitor.visit_ty(bounded_ty); |
| walk_list!(visitor, visit_ty_param_bound, bounds); |
| walk_list!(visitor, visit_lifetime_def, bound_lifetimes); |
| } |
| WherePredicate::RegionPredicate(WhereRegionPredicate{ref lifetime, |
| ref bounds, |
| ..}) => { |
| visitor.visit_lifetime(lifetime); |
| walk_list!(visitor, visit_lifetime, bounds); |
| } |
| WherePredicate::EqPredicate(WhereEqPredicate{id, |
| ref path, |
| ref ty, |
| ..}) => { |
| visitor.visit_path(path, id); |
| visitor.visit_ty(ty); |
| } |
| } |
| } |
| } |
| |
| pub fn walk_fn_ret_ty<V: Visitor>(visitor: &mut V, ret_ty: &FunctionRetTy) { |
| if let FunctionRetTy::Ty(ref output_ty) = *ret_ty { |
| visitor.visit_ty(output_ty) |
| } |
| } |
| |
| pub fn walk_fn_decl<V: Visitor>(visitor: &mut V, function_declaration: &FnDecl) { |
| for argument in &function_declaration.inputs { |
| visitor.visit_pat(&argument.pat); |
| visitor.visit_ty(&argument.ty) |
| } |
| walk_fn_ret_ty(visitor, &function_declaration.output) |
| } |
| |
| pub fn walk_fn_kind<V: Visitor>(visitor: &mut V, function_kind: FnKind) { |
| match function_kind { |
| FnKind::ItemFn(_, generics, _, _, _, _) => { |
| visitor.visit_generics(generics); |
| } |
| FnKind::Method(_, ref sig, _) => { |
| visitor.visit_generics(&sig.generics); |
| } |
| FnKind::Closure => {} |
| } |
| } |
| |
| pub fn walk_fn<V>(visitor: &mut V, kind: FnKind, declaration: &FnDecl, body: &Block, _span: Span) |
| where V: Visitor, |
| { |
| walk_fn_decl(visitor, declaration); |
| walk_fn_kind(visitor, kind); |
| visitor.visit_block(body) |
| } |
| |
| pub fn walk_trait_item<V: Visitor>(visitor: &mut V, trait_item: &TraitItem) { |
| visitor.visit_ident(trait_item.span, trait_item.ident); |
| walk_list!(visitor, visit_attribute, &trait_item.attrs); |
| match trait_item.node { |
| TraitItemKind::Const(ref ty, ref default) => { |
| visitor.visit_ty(ty); |
| walk_list!(visitor, visit_expr, default); |
| } |
| TraitItemKind::Method(ref sig, None) => { |
| visitor.visit_generics(&sig.generics); |
| walk_fn_decl(visitor, &sig.decl); |
| } |
| TraitItemKind::Method(ref sig, Some(ref body)) => { |
| visitor.visit_fn(FnKind::Method(trait_item.ident, sig, None), &sig.decl, |
| body, trait_item.span, trait_item.id); |
| } |
| TraitItemKind::Type(ref bounds, ref default) => { |
| walk_list!(visitor, visit_ty_param_bound, bounds); |
| walk_list!(visitor, visit_ty, default); |
| } |
| TraitItemKind::Macro(ref mac) => { |
| visitor.visit_mac(mac); |
| } |
| } |
| } |
| |
| pub fn walk_impl_item<V: Visitor>(visitor: &mut V, impl_item: &ImplItem) { |
| visitor.visit_vis(&impl_item.vis); |
| visitor.visit_ident(impl_item.span, impl_item.ident); |
| walk_list!(visitor, visit_attribute, &impl_item.attrs); |
| match impl_item.node { |
| ImplItemKind::Const(ref ty, ref expr) => { |
| visitor.visit_ty(ty); |
| visitor.visit_expr(expr); |
| } |
| ImplItemKind::Method(ref sig, ref body) => { |
| visitor.visit_fn(FnKind::Method(impl_item.ident, sig, Some(&impl_item.vis)), &sig.decl, |
| body, impl_item.span, impl_item.id); |
| } |
| ImplItemKind::Type(ref ty) => { |
| visitor.visit_ty(ty); |
| } |
| ImplItemKind::Macro(ref mac) => { |
| visitor.visit_mac(mac); |
| } |
| } |
| } |
| |
| pub fn walk_struct_def<V: Visitor>(visitor: &mut V, struct_definition: &VariantData) { |
| walk_list!(visitor, visit_struct_field, struct_definition.fields()); |
| } |
| |
| pub fn walk_struct_field<V: Visitor>(visitor: &mut V, struct_field: &StructField) { |
| visitor.visit_vis(&struct_field.vis); |
| walk_opt_ident(visitor, struct_field.span, struct_field.ident); |
| visitor.visit_ty(&struct_field.ty); |
| walk_list!(visitor, visit_attribute, &struct_field.attrs); |
| } |
| |
| pub fn walk_block<V: Visitor>(visitor: &mut V, block: &Block) { |
| walk_list!(visitor, visit_stmt, &block.stmts); |
| } |
| |
| pub fn walk_stmt<V: Visitor>(visitor: &mut V, statement: &Stmt) { |
| match statement.node { |
| StmtKind::Local(ref local) => visitor.visit_local(local), |
| StmtKind::Item(ref item) => visitor.visit_item(item), |
| StmtKind::Expr(ref expression) | StmtKind::Semi(ref expression) => { |
| visitor.visit_expr(expression) |
| } |
| StmtKind::Mac(ref mac) => { |
| let (ref mac, _, ref attrs) = **mac; |
| visitor.visit_mac(mac); |
| for attr in attrs.iter() { |
| visitor.visit_attribute(attr); |
| } |
| } |
| } |
| } |
| |
| pub fn walk_mac<V: Visitor>(_: &mut V, _: &Mac) { |
| // Empty! |
| } |
| |
| pub fn walk_expr<V: Visitor>(visitor: &mut V, expression: &Expr) { |
| for attr in expression.attrs.iter() { |
| visitor.visit_attribute(attr); |
| } |
| match expression.node { |
| ExprKind::Box(ref subexpression) => { |
| visitor.visit_expr(subexpression) |
| } |
| ExprKind::InPlace(ref place, ref subexpression) => { |
| visitor.visit_expr(place); |
| visitor.visit_expr(subexpression) |
| } |
| ExprKind::Vec(ref subexpressions) => { |
| walk_list!(visitor, visit_expr, subexpressions); |
| } |
| ExprKind::Repeat(ref element, ref count) => { |
| visitor.visit_expr(element); |
| visitor.visit_expr(count) |
| } |
| ExprKind::Struct(ref path, ref fields, ref optional_base) => { |
| visitor.visit_path(path, expression.id); |
| for field in fields { |
| visitor.visit_ident(field.ident.span, field.ident.node); |
| visitor.visit_expr(&field.expr) |
| } |
| walk_list!(visitor, visit_expr, optional_base); |
| } |
| ExprKind::Tup(ref subexpressions) => { |
| walk_list!(visitor, visit_expr, subexpressions); |
| } |
| ExprKind::Call(ref callee_expression, ref arguments) => { |
| walk_list!(visitor, visit_expr, arguments); |
| visitor.visit_expr(callee_expression) |
| } |
| ExprKind::MethodCall(ref ident, ref types, ref arguments) => { |
| visitor.visit_ident(ident.span, ident.node); |
| walk_list!(visitor, visit_expr, arguments); |
| walk_list!(visitor, visit_ty, types); |
| } |
| ExprKind::Binary(_, ref left_expression, ref right_expression) => { |
| visitor.visit_expr(left_expression); |
| visitor.visit_expr(right_expression) |
| } |
| ExprKind::AddrOf(_, ref subexpression) | ExprKind::Unary(_, ref subexpression) => { |
| visitor.visit_expr(subexpression) |
| } |
| ExprKind::Lit(_) => {} |
| ExprKind::Cast(ref subexpression, ref typ) | ExprKind::Type(ref subexpression, ref typ) => { |
| visitor.visit_expr(subexpression); |
| visitor.visit_ty(typ) |
| } |
| ExprKind::If(ref head_expression, ref if_block, ref optional_else) => { |
| visitor.visit_expr(head_expression); |
| visitor.visit_block(if_block); |
| walk_list!(visitor, visit_expr, optional_else); |
| } |
| ExprKind::While(ref subexpression, ref block, ref opt_sp_ident) => { |
| visitor.visit_expr(subexpression); |
| visitor.visit_block(block); |
| walk_opt_sp_ident(visitor, opt_sp_ident); |
| } |
| ExprKind::IfLet(ref pattern, ref subexpression, ref if_block, ref optional_else) => { |
| visitor.visit_pat(pattern); |
| visitor.visit_expr(subexpression); |
| visitor.visit_block(if_block); |
| walk_list!(visitor, visit_expr, optional_else); |
| } |
| ExprKind::WhileLet(ref pattern, ref subexpression, ref block, ref opt_sp_ident) => { |
| visitor.visit_pat(pattern); |
| visitor.visit_expr(subexpression); |
| visitor.visit_block(block); |
| walk_opt_sp_ident(visitor, opt_sp_ident); |
| } |
| ExprKind::ForLoop(ref pattern, ref subexpression, ref block, ref opt_sp_ident) => { |
| visitor.visit_pat(pattern); |
| visitor.visit_expr(subexpression); |
| visitor.visit_block(block); |
| walk_opt_sp_ident(visitor, opt_sp_ident); |
| } |
| ExprKind::Loop(ref block, ref opt_sp_ident) => { |
| visitor.visit_block(block); |
| walk_opt_sp_ident(visitor, opt_sp_ident); |
| } |
| ExprKind::Match(ref subexpression, ref arms) => { |
| visitor.visit_expr(subexpression); |
| walk_list!(visitor, visit_arm, arms); |
| } |
| ExprKind::Closure(_, ref function_declaration, ref body, _decl_span) => { |
| visitor.visit_fn(FnKind::Closure, |
| function_declaration, |
| body, |
| expression.span, |
| expression.id) |
| } |
| ExprKind::Block(ref block) => visitor.visit_block(block), |
| ExprKind::Assign(ref left_hand_expression, ref right_hand_expression) => { |
| visitor.visit_expr(right_hand_expression); |
| visitor.visit_expr(left_hand_expression) |
| } |
| ExprKind::AssignOp(_, ref left_expression, ref right_expression) => { |
| visitor.visit_expr(right_expression); |
| visitor.visit_expr(left_expression) |
| } |
| ExprKind::Field(ref subexpression, ref ident) => { |
| visitor.visit_expr(subexpression); |
| visitor.visit_ident(ident.span, ident.node); |
| } |
| ExprKind::TupField(ref subexpression, _) => { |
| visitor.visit_expr(subexpression); |
| } |
| ExprKind::Index(ref main_expression, ref index_expression) => { |
| visitor.visit_expr(main_expression); |
| visitor.visit_expr(index_expression) |
| } |
| ExprKind::Range(ref start, ref end, _) => { |
| walk_list!(visitor, visit_expr, start); |
| walk_list!(visitor, visit_expr, end); |
| } |
| ExprKind::Path(ref maybe_qself, ref path) => { |
| if let Some(ref qself) = *maybe_qself { |
| visitor.visit_ty(&qself.ty); |
| } |
| visitor.visit_path(path, expression.id) |
| } |
| ExprKind::Break(ref opt_sp_ident) | ExprKind::Continue(ref opt_sp_ident) => { |
| walk_opt_sp_ident(visitor, opt_sp_ident); |
| } |
| ExprKind::Ret(ref optional_expression) => { |
| walk_list!(visitor, visit_expr, optional_expression); |
| } |
| ExprKind::Mac(ref mac) => visitor.visit_mac(mac), |
| ExprKind::Paren(ref subexpression) => { |
| visitor.visit_expr(subexpression) |
| } |
| ExprKind::InlineAsm(ref ia) => { |
| for &(_, ref input) in &ia.inputs { |
| visitor.visit_expr(&input) |
| } |
| for output in &ia.outputs { |
| visitor.visit_expr(&output.expr) |
| } |
| } |
| ExprKind::Try(ref subexpression) => { |
| visitor.visit_expr(subexpression) |
| } |
| } |
| |
| visitor.visit_expr_post(expression) |
| } |
| |
| pub fn walk_arm<V: Visitor>(visitor: &mut V, arm: &Arm) { |
| walk_list!(visitor, visit_pat, &arm.pats); |
| walk_list!(visitor, visit_expr, &arm.guard); |
| visitor.visit_expr(&arm.body); |
| walk_list!(visitor, visit_attribute, &arm.attrs); |
| } |
| |
| pub fn walk_vis<V: Visitor>(visitor: &mut V, vis: &Visibility) { |
| if let Visibility::Restricted { ref path, id } = *vis { |
| visitor.visit_path(path, id); |
| } |
| } |
