rust/src/libcore/to_str.rs
2013-04-20 22:51:55 +02:00

153 lines
4.0 KiB
Rust

// Copyright 2012-2013 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.
/*!
The `ToStr` trait for converting to strings
*/
use str;
pub trait ToStr {
fn to_str(&self) -> ~str;
}
/// Trait for converting a type to a string, consuming it in the process.
pub trait ToStrConsume {
// Cosume and convert to a string.
fn to_str_consume(self) -> ~str;
}
impl ToStr for bool {
#[inline(always)]
fn to_str(&self) -> ~str { ::bool::to_str(*self) }
}
impl ToStr for () {
#[inline(always)]
fn to_str(&self) -> ~str { ~"()" }
}
impl<A:ToStr> ToStr for (A,) {
#[inline(always)]
fn to_str(&self) -> ~str {
match *self {
(ref a,) => {
~"(" + a.to_str() + ~", " + ~")"
}
}
}
}
impl<A:ToStr,B:ToStr> ToStr for (A, B) {
#[inline(always)]
fn to_str(&self) -> ~str {
// FIXME(#4760): this causes an llvm assertion
//let &(ref a, ref b) = self;
match *self {
(ref a, ref b) => {
~"(" + a.to_str() + ~", " + b.to_str() + ~")"
}
}
}
}
impl<A:ToStr,B:ToStr,C:ToStr> ToStr for (A, B, C) {
#[inline(always)]
fn to_str(&self) -> ~str {
// FIXME(#4760): this causes an llvm assertion
//let &(ref a, ref b, ref c) = self;
match *self {
(ref a, ref b, ref c) => {
fmt!("(%s, %s, %s)",
(*a).to_str(),
(*b).to_str(),
(*c).to_str()
)
}
}
}
}
impl<'self,A:ToStr> ToStr for &'self [A] {
#[inline(always)]
fn to_str(&self) -> ~str {
let mut acc = ~"[", first = true;
for self.each |elt| {
if first { first = false; }
else { str::push_str(&mut acc, ~", "); }
str::push_str(&mut acc, elt.to_str());
}
str::push_char(&mut acc, ']');
acc
}
}
impl<A:ToStr> ToStr for ~[A] {
#[inline(always)]
fn to_str(&self) -> ~str {
let mut acc = ~"[", first = true;
for self.each |elt| {
if first { first = false; }
else { str::push_str(&mut acc, ~", "); }
str::push_str(&mut acc, elt.to_str());
}
str::push_char(&mut acc, ']');
acc
}
}
impl<A:ToStr> ToStr for @[A] {
#[inline(always)]
fn to_str(&self) -> ~str {
let mut acc = ~"[", first = true;
for self.each |elt| {
if first { first = false; }
else { str::push_str(&mut acc, ~", "); }
str::push_str(&mut acc, elt.to_str());
}
str::push_char(&mut acc, ']');
acc
}
}
#[cfg(test)]
#[allow(non_implicitly_copyable_typarams)]
mod tests {
#[test]
fn test_simple_types() {
assert!(1i.to_str() == ~"1");
assert!((-1i).to_str() == ~"-1");
assert!(200u.to_str() == ~"200");
assert!(2u8.to_str() == ~"2");
assert!(true.to_str() == ~"true");
assert!(false.to_str() == ~"false");
assert!(().to_str() == ~"()");
assert!((~"hi").to_str() == ~"hi");
assert!((@"hi").to_str() == ~"hi");
}
#[test]
fn test_tuple_types() {
assert!((1, 2).to_str() == ~"(1, 2)");
assert!((~"a", ~"b", false).to_str() == ~"(a, b, false)");
assert!(((), ((), 100)).to_str() == ~"((), ((), 100))");
}
#[test]
fn test_vectors() {
let x: ~[int] = ~[];
assert!(x.to_str() == ~"[]");
assert!((~[1]).to_str() == ~"[1]");
assert!((~[1, 2, 3]).to_str() == ~"[1, 2, 3]");
assert!((~[~[], ~[1], ~[1, 1]]).to_str() ==
~"[[], [1], [1, 1]]");
}
}