rust/src/libcore/to_str.rs

146 lines
3.8 KiB
Rust
Raw Normal View History

// Copyright 2012 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 kinds::Copy;
use str;
use vec;
pub trait ToStr {
pure fn to_str(&self) -> ~str;
}
impl ToStr for bool {
#[inline(always)]
pure fn to_str(&self) -> ~str { ::bool::to_str(*self) }
}
impl ToStr for () {
#[inline(always)]
pure fn to_str(&self) -> ~str { ~"()" }
}
impl ToStr for ~str {
#[inline(always)]
pure fn to_str(&self) -> ~str { copy *self }
}
impl ToStr for &str {
#[inline(always)]
pure fn to_str(&self) -> ~str { ::str::from_slice(*self) }
}
impl ToStr for @str {
#[inline(always)]
pure fn to_str(&self) -> ~str { ::str::from_slice(*self) }
2012-09-12 14:15:27 -05:00
}
// FIXME #4898: impl for one-tuples
impl<A:ToStr,B:ToStr> ToStr for (A, B) {
#[inline(always)]
pure 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)]
pure 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<A:ToStr> ToStr for ~[A] {
#[inline(always)]
pure fn to_str(&self) -> ~str {
unsafe {
// Bleh -- not really unsafe
// push_str and push_char
let mut acc = ~"[", first = true;
for self.each |elt| {
unsafe {
if first { first = false; }
else { str::push_str(&mut acc, ~", "); }
str::push_str(&mut acc, elt.to_str());
}
}
str::push_char(&mut acc, ']');
2013-02-15 02:51:28 -06:00
acc
}
}
}
impl<A:ToStr> ToStr for @A {
#[inline(always)]
pure fn to_str(&self) -> ~str { ~"@" + (**self).to_str() }
}
impl<A:ToStr> ToStr for ~A {
#[inline(always)]
pure fn to_str(&self) -> ~str { ~"~" + (**self).to_str() }
}
#[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";
2012-09-12 14:15:27 -05:00
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]
#[ignore]
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]]";
}
#[test]
fn test_pointer_types() {
assert (@1).to_str() == ~"@1";
assert (~(true, false)).to_str() == ~"~(true, false)";
}
}