768 lines
30 KiB
Rust
768 lines
30 KiB
Rust
// Copyright 2012-2013 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use abi::Abi;
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use ast::*;
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use ast;
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use codemap::Span;
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use parse;
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use owned_slice::OwnedSlice;
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// Context-passing AST walker. Each overridden visit method has full control
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// over what happens with its node, it can do its own traversal of the node's
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// children (potentially passing in different contexts to each), call
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// visit::visit_* to apply the default traversal algorithm (again, it can
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// override the context), or prevent deeper traversal by doing nothing.
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//
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// Note: it is an important invariant that the default visitor walks the body
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// of a function in "execution order" (more concretely, reverse post-order
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// with respect to the CFG implied by the AST), meaning that if AST node A may
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// execute before AST node B, then A is visited first. The borrow checker in
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// particular relies on this property.
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pub enum FnKind<'a> {
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// fn foo() or extern "Abi" fn foo()
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FkItemFn(Ident, &'a Generics, Purity, Abi),
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// fn foo(&self)
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FkMethod(Ident, &'a Generics, &'a Method),
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// |x, y| ...
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// proc(x, y) ...
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FkFnBlock,
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}
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pub fn name_of_fn(fk: &FnKind) -> Ident {
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match *fk {
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FkItemFn(name, _, _, _) | FkMethod(name, _, _) => name,
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FkFnBlock(..) => parse::token::special_idents::invalid
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}
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}
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pub fn generics_of_fn(fk: &FnKind) -> Generics {
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match *fk {
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FkItemFn(_, generics, _, _) |
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FkMethod(_, generics, _) => {
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(*generics).clone()
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}
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FkFnBlock(..) => {
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Generics {
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lifetimes: Vec::new(),
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ty_params: OwnedSlice::empty(),
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}
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}
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}
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}
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pub trait Visitor<E: Clone> {
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fn visit_ident(&mut self, _sp: Span, _ident: Ident, _e: E) {
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/*! Visit the idents */
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}
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fn visit_mod(&mut self, m: &Mod, _s: Span, _n: NodeId, e: E) { walk_mod(self, m, e) }
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fn visit_view_item(&mut self, i: &ViewItem, e: E) { walk_view_item(self, i, e) }
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fn visit_foreign_item(&mut self, i: &ForeignItem, e: E) { walk_foreign_item(self, i, e) }
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fn visit_item(&mut self, i: &Item, e: E) { walk_item(self, i, e) }
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fn visit_local(&mut self, l: &Local, e: E) { walk_local(self, l, e) }
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fn visit_block(&mut self, b: &Block, e: E) { walk_block(self, b, e) }
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fn visit_stmt(&mut self, s: &Stmt, e: E) { walk_stmt(self, s, e) }
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fn visit_arm(&mut self, a: &Arm, e: E) { walk_arm(self, a, e) }
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fn visit_pat(&mut self, p: &Pat, e: E) { walk_pat(self, p, e) }
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fn visit_decl(&mut self, d: &Decl, e: E) { walk_decl(self, d, e) }
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fn visit_expr(&mut self, ex: &Expr, e: E) { walk_expr(self, ex, e) }
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fn visit_expr_post(&mut self, _ex: &Expr, _e: E) { }
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fn visit_ty(&mut self, t: &Ty, e: E) { walk_ty(self, t, e) }
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fn visit_generics(&mut self, g: &Generics, e: E) { walk_generics(self, g, e) }
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fn visit_fn(&mut self, fk: &FnKind, fd: &FnDecl, b: &Block, s: Span, n: NodeId, e: E) {
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walk_fn(self, fk, fd, b, s, n , e)
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}
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fn visit_ty_method(&mut self, t: &TypeMethod, e: E) { walk_ty_method(self, t, e) }
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fn visit_trait_method(&mut self, t: &TraitMethod, e: E) { walk_trait_method(self, t, e) }
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fn visit_struct_def(&mut self, s: &StructDef, i: Ident, g: &Generics, n: NodeId, e: E) {
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walk_struct_def(self, s, i, g, n, e)
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}
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fn visit_struct_field(&mut self, s: &StructField, e: E) { walk_struct_field(self, s, e) }
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fn visit_variant(&mut self, v: &Variant, g: &Generics, e: E) { walk_variant(self, v, g, e) }
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fn visit_opt_lifetime_ref(&mut self,
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_span: Span,
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opt_lifetime: &Option<Lifetime>,
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env: E) {
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/*!
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* Visits an optional reference to a lifetime. The `span` is
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* the span of some surrounding reference should opt_lifetime
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* be None.
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*/
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match *opt_lifetime {
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Some(ref l) => self.visit_lifetime_ref(l, env),
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None => ()
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}
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}
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fn visit_lifetime_ref(&mut self, _lifetime: &Lifetime, _e: E) {
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/*! Visits a reference to a lifetime */
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}
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fn visit_lifetime_decl(&mut self, _lifetime: &Lifetime, _e: E) {
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/*! Visits a declaration of a lifetime */
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}
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fn visit_explicit_self(&mut self, es: &ExplicitSelf, e: E) {
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walk_explicit_self(self, es, e)
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}
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fn visit_mac(&mut self, macro: &Mac, e: E) {
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walk_mac(self, macro, e)
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}
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fn visit_path(&mut self, path: &Path, _id: ast::NodeId, e: E) {
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walk_path(self, path, e)
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}
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}
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pub fn walk_inlined_item<E: Clone, V: Visitor<E>>(visitor: &mut V,
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item: &ast::InlinedItem,
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env: E) {
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match *item {
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IIItem(i) => visitor.visit_item(i, env),
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IIForeign(i) => visitor.visit_foreign_item(i, env),
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IIMethod(_, _, m) => walk_method_helper(visitor, m, env),
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}
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}
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pub fn walk_crate<E: Clone, V: Visitor<E>>(visitor: &mut V, krate: &Crate, env: E) {
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visitor.visit_mod(&krate.module, krate.span, CRATE_NODE_ID, env)
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}
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pub fn walk_mod<E: Clone, V: Visitor<E>>(visitor: &mut V, module: &Mod, env: E) {
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for view_item in module.view_items.iter() {
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visitor.visit_view_item(view_item, env.clone())
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}
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for item in module.items.iter() {
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visitor.visit_item(*item, env.clone())
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}
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}
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pub fn walk_view_item<E: Clone, V: Visitor<E>>(visitor: &mut V, vi: &ViewItem, env: E) {
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match vi.node {
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ViewItemExternCrate(name, _, _) => {
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visitor.visit_ident(vi.span, name, env)
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}
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ViewItemUse(ref paths) => {
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for vp in paths.iter() {
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match vp.node {
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ViewPathSimple(ident, ref path, id) => {
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visitor.visit_ident(vp.span, ident, env.clone());
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visitor.visit_path(path, id, env.clone());
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}
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ViewPathGlob(ref path, id) => {
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visitor.visit_path(path, id, env.clone());
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}
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ViewPathList(ref path, ref list, _) => {
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for id in list.iter() {
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visitor.visit_ident(id.span, id.node.name, env.clone())
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}
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walk_path(visitor, path, env.clone());
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}
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}
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}
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}
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}
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}
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pub fn walk_local<E: Clone, V: Visitor<E>>(visitor: &mut V, local: &Local, env: E) {
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visitor.visit_pat(local.pat, env.clone());
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visitor.visit_ty(local.ty, env.clone());
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match local.init {
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None => {}
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Some(initializer) => visitor.visit_expr(initializer, env),
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}
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}
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fn walk_explicit_self<E: Clone, V: Visitor<E>>(visitor: &mut V,
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explicit_self: &ExplicitSelf,
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env: E) {
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match explicit_self.node {
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SelfStatic | SelfValue | SelfUniq => {}
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SelfRegion(ref lifetime, _) => {
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visitor.visit_opt_lifetime_ref(explicit_self.span, lifetime, env)
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}
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}
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}
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/// Like with walk_method_helper this doesn't correspond to a method
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/// in Visitor, and so it gets a _helper suffix.
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pub fn walk_trait_ref_helper<E: Clone, V: Visitor<E>>(visitor: &mut V,
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trait_ref: &TraitRef,
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env: E) {
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visitor.visit_path(&trait_ref.path, trait_ref.ref_id, env)
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}
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pub fn walk_item<E: Clone, V: Visitor<E>>(visitor: &mut V, item: &Item, env: E) {
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visitor.visit_ident(item.span, item.ident, env.clone());
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match item.node {
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ItemStatic(typ, _, expr) => {
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visitor.visit_ty(typ, env.clone());
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visitor.visit_expr(expr, env);
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}
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ItemFn(declaration, purity, abi, ref generics, body) => {
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visitor.visit_fn(&FkItemFn(item.ident, generics, purity, abi),
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declaration,
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body,
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item.span,
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item.id,
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env)
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}
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ItemMod(ref module) => {
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visitor.visit_mod(module, item.span, item.id, env)
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}
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ItemForeignMod(ref foreign_module) => {
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for view_item in foreign_module.view_items.iter() {
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visitor.visit_view_item(view_item, env.clone())
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}
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for foreign_item in foreign_module.items.iter() {
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visitor.visit_foreign_item(*foreign_item, env.clone())
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}
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}
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ItemTy(typ, ref type_parameters) => {
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visitor.visit_ty(typ, env.clone());
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visitor.visit_generics(type_parameters, env)
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}
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ItemEnum(ref enum_definition, ref type_parameters) => {
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visitor.visit_generics(type_parameters, env.clone());
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walk_enum_def(visitor, enum_definition, type_parameters, env)
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}
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ItemImpl(ref type_parameters,
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ref trait_reference,
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typ,
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ref methods) => {
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visitor.visit_generics(type_parameters, env.clone());
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match *trait_reference {
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Some(ref trait_reference) => walk_trait_ref_helper(visitor,
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trait_reference, env.clone()),
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None => ()
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}
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visitor.visit_ty(typ, env.clone());
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for method in methods.iter() {
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walk_method_helper(visitor, *method, env.clone())
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}
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}
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ItemStruct(struct_definition, ref generics) => {
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visitor.visit_generics(generics, env.clone());
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visitor.visit_struct_def(struct_definition,
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item.ident,
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generics,
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item.id,
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env)
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}
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ItemTrait(ref generics, ref trait_paths, ref methods) => {
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visitor.visit_generics(generics, env.clone());
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for trait_path in trait_paths.iter() {
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visitor.visit_path(&trait_path.path,
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trait_path.ref_id,
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env.clone())
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}
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for method in methods.iter() {
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visitor.visit_trait_method(method, env.clone())
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}
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}
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ItemMac(ref macro) => visitor.visit_mac(macro, env),
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}
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}
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pub fn walk_enum_def<E: Clone, V:Visitor<E>>(visitor: &mut V,
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enum_definition: &EnumDef,
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generics: &Generics,
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env: E) {
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for &variant in enum_definition.variants.iter() {
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visitor.visit_variant(variant, generics, env.clone());
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}
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}
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pub fn walk_variant<E: Clone, V: Visitor<E>>(visitor: &mut V,
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variant: &Variant,
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generics: &Generics,
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env: E) {
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visitor.visit_ident(variant.span, variant.node.name, env.clone());
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match variant.node.kind {
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TupleVariantKind(ref variant_arguments) => {
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for variant_argument in variant_arguments.iter() {
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visitor.visit_ty(variant_argument.ty, env.clone())
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}
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}
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StructVariantKind(struct_definition) => {
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visitor.visit_struct_def(struct_definition,
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variant.node.name,
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generics,
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variant.node.id,
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env.clone())
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}
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}
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match variant.node.disr_expr {
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Some(expr) => visitor.visit_expr(expr, env),
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None => ()
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}
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}
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pub fn skip_ty<E, V: Visitor<E>>(_: &mut V, _: &Ty, _: E) {
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// Empty!
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}
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pub fn walk_ty<E: Clone, V: Visitor<E>>(visitor: &mut V, typ: &Ty, env: E) {
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match typ.node {
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TyUniq(ty) | TyVec(ty) | TyBox(ty) => {
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visitor.visit_ty(ty, env)
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}
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TyPtr(ref mutable_type) => {
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visitor.visit_ty(mutable_type.ty, env)
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}
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TyRptr(ref lifetime, ref mutable_type) => {
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visitor.visit_opt_lifetime_ref(typ.span, lifetime, env.clone());
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visitor.visit_ty(mutable_type.ty, env)
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}
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TyTup(ref tuple_element_types) => {
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for &tuple_element_type in tuple_element_types.iter() {
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visitor.visit_ty(tuple_element_type, env.clone())
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}
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}
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TyClosure(ref function_declaration) => {
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for argument in function_declaration.decl.inputs.iter() {
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visitor.visit_ty(argument.ty, env.clone())
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}
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visitor.visit_ty(function_declaration.decl.output, env.clone());
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for bounds in function_declaration.bounds.iter() {
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walk_ty_param_bounds(visitor, bounds, env.clone())
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}
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visitor.visit_opt_lifetime_ref(
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typ.span,
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&function_declaration.region,
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env.clone());
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walk_lifetime_decls(visitor, &function_declaration.lifetimes,
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env.clone());
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}
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TyBareFn(ref function_declaration) => {
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for argument in function_declaration.decl.inputs.iter() {
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visitor.visit_ty(argument.ty, env.clone())
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}
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visitor.visit_ty(function_declaration.decl.output, env.clone());
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walk_lifetime_decls(visitor, &function_declaration.lifetimes,
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env.clone());
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}
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TyPath(ref path, ref bounds, id) => {
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visitor.visit_path(path, id, env.clone());
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for bounds in bounds.iter() {
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walk_ty_param_bounds(visitor, bounds, env.clone())
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}
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}
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TyFixedLengthVec(ty, expression) => {
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visitor.visit_ty(ty, env.clone());
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visitor.visit_expr(expression, env)
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}
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TyTypeof(expression) => {
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visitor.visit_expr(expression, env)
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}
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TyNil | TyBot | TyInfer => {}
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}
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}
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fn walk_lifetime_decls<E: Clone, V: Visitor<E>>(visitor: &mut V,
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lifetimes: &Vec<Lifetime>,
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env: E) {
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for l in lifetimes.iter() {
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visitor.visit_lifetime_decl(l, env.clone());
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}
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}
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pub fn walk_path<E: Clone, V: Visitor<E>>(visitor: &mut V, path: &Path, env: E) {
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for segment in path.segments.iter() {
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visitor.visit_ident(path.span, segment.identifier, env.clone());
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for &typ in segment.types.iter() {
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visitor.visit_ty(typ, env.clone());
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}
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for lifetime in segment.lifetimes.iter() {
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visitor.visit_lifetime_ref(lifetime, env.clone());
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}
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}
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}
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pub fn walk_pat<E: Clone, V: Visitor<E>>(visitor: &mut V, pattern: &Pat, env: E) {
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match pattern.node {
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PatEnum(ref path, ref children) => {
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visitor.visit_path(path, pattern.id, env.clone());
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for children in children.iter() {
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for child in children.iter() {
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visitor.visit_pat(*child, env.clone())
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}
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}
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}
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PatStruct(ref path, ref fields, _) => {
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visitor.visit_path(path, pattern.id, env.clone());
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for field in fields.iter() {
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visitor.visit_pat(field.pat, env.clone())
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}
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}
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PatTup(ref tuple_elements) => {
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for tuple_element in tuple_elements.iter() {
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visitor.visit_pat(*tuple_element, env.clone())
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}
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}
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PatUniq(subpattern) |
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PatRegion(subpattern) => {
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visitor.visit_pat(subpattern, env)
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}
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PatIdent(_, ref path, ref optional_subpattern) => {
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visitor.visit_path(path, pattern.id, env.clone());
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match *optional_subpattern {
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None => {}
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Some(subpattern) => visitor.visit_pat(subpattern, env),
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}
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}
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PatLit(expression) => visitor.visit_expr(expression, env),
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PatRange(lower_bound, upper_bound) => {
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visitor.visit_expr(lower_bound, env.clone());
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visitor.visit_expr(upper_bound, env)
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}
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PatWild | PatWildMulti => (),
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PatVec(ref prepattern, ref slice_pattern, ref postpatterns) => {
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for prepattern in prepattern.iter() {
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visitor.visit_pat(*prepattern, env.clone())
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}
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for slice_pattern in slice_pattern.iter() {
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visitor.visit_pat(*slice_pattern, env.clone())
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}
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for postpattern in postpatterns.iter() {
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visitor.visit_pat(*postpattern, env.clone())
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}
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}
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}
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}
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pub fn walk_foreign_item<E: Clone, V: Visitor<E>>(visitor: &mut V,
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foreign_item: &ForeignItem,
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env: E) {
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visitor.visit_ident(foreign_item.span, foreign_item.ident, env.clone());
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match foreign_item.node {
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ForeignItemFn(function_declaration, ref generics) => {
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walk_fn_decl(visitor, function_declaration, env.clone());
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visitor.visit_generics(generics, env)
|
|
}
|
|
ForeignItemStatic(typ, _) => visitor.visit_ty(typ, env),
|
|
}
|
|
}
|
|
|
|
pub fn walk_ty_param_bounds<E: Clone, V: Visitor<E>>(visitor: &mut V,
|
|
bounds: &OwnedSlice<TyParamBound>,
|
|
env: E) {
|
|
for bound in bounds.iter() {
|
|
match *bound {
|
|
TraitTyParamBound(ref typ) => {
|
|
walk_trait_ref_helper(visitor, typ, env.clone())
|
|
}
|
|
RegionTyParamBound => {}
|
|
}
|
|
}
|
|
}
|
|
|
|
pub fn walk_generics<E: Clone, V: Visitor<E>>(visitor: &mut V,
|
|
generics: &Generics,
|
|
env: E) {
|
|
for type_parameter in generics.ty_params.iter() {
|
|
walk_ty_param_bounds(visitor, &type_parameter.bounds, env.clone());
|
|
match type_parameter.default {
|
|
Some(ty) => visitor.visit_ty(ty, env.clone()),
|
|
None => {}
|
|
}
|
|
}
|
|
walk_lifetime_decls(visitor, &generics.lifetimes, env);
|
|
}
|
|
|
|
pub fn walk_fn_decl<E: Clone, V: Visitor<E>>(visitor: &mut V,
|
|
function_declaration: &FnDecl,
|
|
env: E) {
|
|
for argument in function_declaration.inputs.iter() {
|
|
visitor.visit_pat(argument.pat, env.clone());
|
|
visitor.visit_ty(argument.ty, env.clone())
|
|
}
|
|
visitor.visit_ty(function_declaration.output, env)
|
|
}
|
|
|
|
// Note: there is no visit_method() method in the visitor, instead override
|
|
// visit_fn() and check for FkMethod(). I named this visit_method_helper()
|
|
// because it is not a default impl of any method, though I doubt that really
|
|
// clarifies anything. - Niko
|
|
pub fn walk_method_helper<E: Clone, V: Visitor<E>>(visitor: &mut V,
|
|
method: &Method,
|
|
env: E) {
|
|
visitor.visit_ident(method.span, method.ident, env.clone());
|
|
visitor.visit_fn(&FkMethod(method.ident, &method.generics, method),
|
|
method.decl,
|
|
method.body,
|
|
method.span,
|
|
method.id,
|
|
env)
|
|
}
|
|
|
|
pub fn walk_fn<E: Clone, V: Visitor<E>>(visitor: &mut V,
|
|
function_kind: &FnKind,
|
|
function_declaration: &FnDecl,
|
|
function_body: &Block,
|
|
_span: Span,
|
|
_: NodeId,
|
|
env: E) {
|
|
walk_fn_decl(visitor, function_declaration, env.clone());
|
|
|
|
match *function_kind {
|
|
FkItemFn(_, generics, _, _) => {
|
|
visitor.visit_generics(generics, env.clone());
|
|
}
|
|
FkMethod(_, generics, method) => {
|
|
visitor.visit_generics(generics, env.clone());
|
|
|
|
visitor.visit_explicit_self(&method.explicit_self, env.clone());
|
|
}
|
|
FkFnBlock(..) => {}
|
|
}
|
|
|
|
visitor.visit_block(function_body, env)
|
|
}
|
|
|
|
pub fn walk_ty_method<E: Clone, V: Visitor<E>>(visitor: &mut V,
|
|
method_type: &TypeMethod,
|
|
env: E) {
|
|
visitor.visit_ident(method_type.span, method_type.ident, env.clone());
|
|
visitor.visit_explicit_self(&method_type.explicit_self, env.clone());
|
|
for argument_type in method_type.decl.inputs.iter() {
|
|
visitor.visit_ty(argument_type.ty, env.clone())
|
|
}
|
|
visitor.visit_generics(&method_type.generics, env.clone());
|
|
visitor.visit_ty(method_type.decl.output, env);
|
|
}
|
|
|
|
pub fn walk_trait_method<E: Clone, V: Visitor<E>>(visitor: &mut V,
|
|
trait_method: &TraitMethod,
|
|
env: E) {
|
|
match *trait_method {
|
|
Required(ref method_type) => {
|
|
visitor.visit_ty_method(method_type, env)
|
|
}
|
|
Provided(method) => walk_method_helper(visitor, method, env),
|
|
}
|
|
}
|
|
|
|
pub fn walk_struct_def<E: Clone, V: Visitor<E>>(visitor: &mut V,
|
|
struct_definition: &StructDef,
|
|
_: Ident,
|
|
_: &Generics,
|
|
_: NodeId,
|
|
env: E) {
|
|
for field in struct_definition.fields.iter() {
|
|
visitor.visit_struct_field(field, env.clone())
|
|
}
|
|
}
|
|
|
|
pub fn walk_struct_field<E: Clone, V: Visitor<E>>(visitor: &mut V,
|
|
struct_field: &StructField,
|
|
env: E) {
|
|
match struct_field.node.kind {
|
|
NamedField(name, _) => {
|
|
visitor.visit_ident(struct_field.span, name, env.clone())
|
|
}
|
|
_ => {}
|
|
}
|
|
|
|
visitor.visit_ty(struct_field.node.ty, env)
|
|
}
|
|
|
|
pub fn walk_block<E: Clone, V: Visitor<E>>(visitor: &mut V, block: &Block, env: E) {
|
|
for view_item in block.view_items.iter() {
|
|
visitor.visit_view_item(view_item, env.clone())
|
|
}
|
|
for statement in block.stmts.iter() {
|
|
visitor.visit_stmt(*statement, env.clone())
|
|
}
|
|
walk_expr_opt(visitor, block.expr, env)
|
|
}
|
|
|
|
pub fn walk_stmt<E: Clone, V: Visitor<E>>(visitor: &mut V, statement: &Stmt, env: E) {
|
|
match statement.node {
|
|
StmtDecl(declaration, _) => visitor.visit_decl(declaration, env),
|
|
StmtExpr(expression, _) | StmtSemi(expression, _) => {
|
|
visitor.visit_expr(expression, env)
|
|
}
|
|
StmtMac(ref macro, _) => visitor.visit_mac(macro, env),
|
|
}
|
|
}
|
|
|
|
pub fn walk_decl<E: Clone, V: Visitor<E>>(visitor: &mut V, declaration: &Decl, env: E) {
|
|
match declaration.node {
|
|
DeclLocal(ref local) => visitor.visit_local(*local, env),
|
|
DeclItem(item) => visitor.visit_item(item, env),
|
|
}
|
|
}
|
|
|
|
pub fn walk_expr_opt<E: Clone, V: Visitor<E>>(visitor: &mut V,
|
|
optional_expression: Option<@Expr>,
|
|
env: E) {
|
|
match optional_expression {
|
|
None => {}
|
|
Some(expression) => visitor.visit_expr(expression, env),
|
|
}
|
|
}
|
|
|
|
pub fn walk_exprs<E: Clone, V: Visitor<E>>(visitor: &mut V,
|
|
expressions: &[@Expr],
|
|
env: E) {
|
|
for expression in expressions.iter() {
|
|
visitor.visit_expr(*expression, env.clone())
|
|
}
|
|
}
|
|
|
|
pub fn walk_mac<E, V: Visitor<E>>(_: &mut V, _: &Mac, _: E) {
|
|
// Empty!
|
|
}
|
|
|
|
pub fn walk_expr<E: Clone, V: Visitor<E>>(visitor: &mut V, expression: &Expr, env: E) {
|
|
match expression.node {
|
|
ExprVstore(subexpression, _) => {
|
|
visitor.visit_expr(subexpression, env.clone())
|
|
}
|
|
ExprBox(place, subexpression) => {
|
|
visitor.visit_expr(place, env.clone());
|
|
visitor.visit_expr(subexpression, env.clone())
|
|
}
|
|
ExprVec(ref subexpressions) => {
|
|
walk_exprs(visitor, subexpressions.as_slice(), env.clone())
|
|
}
|
|
ExprRepeat(element, count) => {
|
|
visitor.visit_expr(element, env.clone());
|
|
visitor.visit_expr(count, env.clone())
|
|
}
|
|
ExprStruct(ref path, ref fields, optional_base) => {
|
|
visitor.visit_path(path, expression.id, env.clone());
|
|
for field in fields.iter() {
|
|
visitor.visit_expr(field.expr, env.clone())
|
|
}
|
|
walk_expr_opt(visitor, optional_base, env.clone())
|
|
}
|
|
ExprTup(ref subexpressions) => {
|
|
for subexpression in subexpressions.iter() {
|
|
visitor.visit_expr(*subexpression, env.clone())
|
|
}
|
|
}
|
|
ExprCall(callee_expression, ref arguments) => {
|
|
for argument in arguments.iter() {
|
|
visitor.visit_expr(*argument, env.clone())
|
|
}
|
|
visitor.visit_expr(callee_expression, env.clone())
|
|
}
|
|
ExprMethodCall(_, ref types, ref arguments) => {
|
|
walk_exprs(visitor, arguments.as_slice(), env.clone());
|
|
for &typ in types.iter() {
|
|
visitor.visit_ty(typ, env.clone())
|
|
}
|
|
}
|
|
ExprBinary(_, left_expression, right_expression) => {
|
|
visitor.visit_expr(left_expression, env.clone());
|
|
visitor.visit_expr(right_expression, env.clone())
|
|
}
|
|
ExprAddrOf(_, subexpression) | ExprUnary(_, subexpression) => {
|
|
visitor.visit_expr(subexpression, env.clone())
|
|
}
|
|
ExprLit(_) => {}
|
|
ExprCast(subexpression, typ) => {
|
|
visitor.visit_expr(subexpression, env.clone());
|
|
visitor.visit_ty(typ, env.clone())
|
|
}
|
|
ExprIf(head_expression, if_block, optional_else) => {
|
|
visitor.visit_expr(head_expression, env.clone());
|
|
visitor.visit_block(if_block, env.clone());
|
|
walk_expr_opt(visitor, optional_else, env.clone())
|
|
}
|
|
ExprWhile(subexpression, block) => {
|
|
visitor.visit_expr(subexpression, env.clone());
|
|
visitor.visit_block(block, env.clone())
|
|
}
|
|
ExprForLoop(pattern, subexpression, block, _) => {
|
|
visitor.visit_pat(pattern, env.clone());
|
|
visitor.visit_expr(subexpression, env.clone());
|
|
visitor.visit_block(block, env.clone())
|
|
}
|
|
ExprLoop(block, _) => visitor.visit_block(block, env.clone()),
|
|
ExprMatch(subexpression, ref arms) => {
|
|
visitor.visit_expr(subexpression, env.clone());
|
|
for arm in arms.iter() {
|
|
visitor.visit_arm(arm, env.clone())
|
|
}
|
|
}
|
|
ExprFnBlock(function_declaration, body) => {
|
|
visitor.visit_fn(&FkFnBlock,
|
|
function_declaration,
|
|
body,
|
|
expression.span,
|
|
expression.id,
|
|
env.clone())
|
|
}
|
|
ExprProc(function_declaration, body) => {
|
|
visitor.visit_fn(&FkFnBlock,
|
|
function_declaration,
|
|
body,
|
|
expression.span,
|
|
expression.id,
|
|
env.clone())
|
|
}
|
|
ExprBlock(block) => visitor.visit_block(block, env.clone()),
|
|
ExprAssign(left_hand_expression, right_hand_expression) => {
|
|
visitor.visit_expr(right_hand_expression, env.clone());
|
|
visitor.visit_expr(left_hand_expression, env.clone())
|
|
}
|
|
ExprAssignOp(_, left_expression, right_expression) => {
|
|
visitor.visit_expr(right_expression, env.clone());
|
|
visitor.visit_expr(left_expression, env.clone())
|
|
}
|
|
ExprField(subexpression, _, ref types) => {
|
|
visitor.visit_expr(subexpression, env.clone());
|
|
for &typ in types.iter() {
|
|
visitor.visit_ty(typ, env.clone())
|
|
}
|
|
}
|
|
ExprIndex(main_expression, index_expression) => {
|
|
visitor.visit_expr(main_expression, env.clone());
|
|
visitor.visit_expr(index_expression, env.clone())
|
|
}
|
|
ExprPath(ref path) => {
|
|
visitor.visit_path(path, expression.id, env.clone())
|
|
}
|
|
ExprBreak(_) | ExprAgain(_) => {}
|
|
ExprRet(optional_expression) => {
|
|
walk_expr_opt(visitor, optional_expression, env.clone())
|
|
}
|
|
ExprMac(ref macro) => visitor.visit_mac(macro, env.clone()),
|
|
ExprParen(subexpression) => {
|
|
visitor.visit_expr(subexpression, env.clone())
|
|
}
|
|
ExprInlineAsm(ref assembler) => {
|
|
for &(_, input) in assembler.inputs.iter() {
|
|
visitor.visit_expr(input, env.clone())
|
|
}
|
|
for &(_, output) in assembler.outputs.iter() {
|
|
visitor.visit_expr(output, env.clone())
|
|
}
|
|
}
|
|
}
|
|
|
|
visitor.visit_expr_post(expression, env.clone())
|
|
}
|
|
|
|
pub fn walk_arm<E: Clone, V: Visitor<E>>(visitor: &mut V, arm: &Arm, env: E) {
|
|
for pattern in arm.pats.iter() {
|
|
visitor.visit_pat(*pattern, env.clone())
|
|
}
|
|
walk_expr_opt(visitor, arm.guard, env.clone());
|
|
visitor.visit_expr(arm.body, env)
|
|
}
|