1 // Copyright 2014 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
13 //! This module shows spans for all expressions in the crate
14 //! to help with compiler debugging.
16 use std::str::FromStr;
29 impl FromStr for Mode {
31 fn from_str(s: &str) -> Result<Mode, ()> {
33 "expr" => Mode::Expression,
34 "pat" => Mode::Pattern,
42 struct ShowSpanVisitor<'a> {
43 span_diagnostic: &'a errors::Handler,
47 impl<'a> Visitor<'a> for ShowSpanVisitor<'a> {
48 fn visit_expr(&mut self, e: &'a ast::Expr) {
49 if let Mode::Expression = self.mode {
50 self.span_diagnostic.span_warn(e.span, "expression");
52 visit::walk_expr(self, e);
55 fn visit_pat(&mut self, p: &'a ast::Pat) {
56 if let Mode::Pattern = self.mode {
57 self.span_diagnostic.span_warn(p.span, "pattern");
59 visit::walk_pat(self, p);
62 fn visit_ty(&mut self, t: &'a ast::Ty) {
63 if let Mode::Type = self.mode {
64 self.span_diagnostic.span_warn(t.span, "type");
66 visit::walk_ty(self, t);
69 fn visit_mac(&mut self, mac: &'a ast::Mac) {
70 visit::walk_mac(self, mac);
74 pub fn run(span_diagnostic: &errors::Handler,
77 let mode = match mode.parse().ok() {
81 let mut v = ShowSpanVisitor {
82 span_diagnostic: span_diagnostic,
85 visit::walk_crate(&mut v, krate);