1 // Copyright 2012 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.
14 use syntax::codemap::{span};
17 use core::hashmap::HashSet;
21 pub fn time<T>(do_it: bool, what: ~str, thunk: &fn() -> T) -> T {
22 if !do_it { return thunk(); }
23 let start = extra::time::precise_time_s();
25 let end = extra::time::precise_time_s();
26 io::println(fmt!("time: %3.3f s\t%s", end - start, what));
30 pub fn indent<R>(op: &fn() -> R) -> R {
31 // Use in conjunction with the log post-processor like `src/etc/indenter`
32 // to make debug output more readable.
35 debug!("<< (Result = %?)", r);
39 pub struct _indenter {
43 impl Drop for _indenter {
44 fn drop(&self) { debug!("<<"); }
47 pub fn _indenter(_i: ()) -> _indenter {
53 pub fn indenter() -> _indenter {
58 pub fn field_expr(f: ast::field) -> @ast::expr { return f.node.expr; }
60 pub fn field_exprs(fields: ~[ast::field]) -> ~[@ast::expr] {
61 fields.map(|f| f.node.expr)
64 // Takes a predicate p, returns true iff p is true for any subexpressions
65 // of b -- skipping any inner loops (loop, while, loop_body)
66 pub fn loop_query(b: &ast::blk, p: @fn(&ast::expr_) -> bool) -> bool {
68 let visit_expr: @fn(@ast::expr,
70 visit::vt<@mut bool>)) = |e, (flag, v)| {
73 // Skip inner loops, since a break in the inner loop isn't a
74 // break inside the outer loop
75 ast::expr_loop(*) | ast::expr_while(*)
76 | ast::expr_loop_body(*) => {}
77 _ => visit::visit_expr(e, (flag, v))
80 let v = visit::mk_vt(@visit::Visitor {
81 visit_expr: visit_expr,
82 .. *visit::default_visitor()});
83 visit::visit_block(b, (rs, v));
87 // Takes a predicate p, returns true iff p is true for any subexpressions
88 // of b -- skipping any inner loops (loop, while, loop_body)
89 pub fn block_query(b: &ast::blk, p: @fn(@ast::expr) -> bool) -> bool {
91 let visit_expr: @fn(@ast::expr,
93 visit::vt<@mut bool>)) = |e, (flag, v)| {
95 visit::visit_expr(e, (flag, v))
97 let v = visit::mk_vt(@visit::Visitor{
98 visit_expr: visit_expr,
99 .. *visit::default_visitor()});
100 visit::visit_block(b, (rs, v));
104 pub fn local_rhs_span(l: @ast::local, def: span) -> span {
106 Some(i) => return i.span,
111 pub fn pluralize(n: uint, s: ~str) -> ~str {
113 else { fmt!("%ss", s) }
116 // A set of node IDs (used to keep track of which node IDs are for statements)
117 pub type stmt_set = @mut HashSet<ast::node_id>;