153 lines
4.0 KiB
Rust
153 lines
4.0 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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/*!
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The `ToStr` trait for converting to strings
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*/
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use str;
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pub trait ToStr {
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fn to_str(&self) -> ~str;
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}
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/// Trait for converting a type to a string, consuming it in the process.
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pub trait ToStrConsume {
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// Cosume and convert to a string.
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fn to_str_consume(self) -> ~str;
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}
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impl ToStr for bool {
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#[inline(always)]
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fn to_str(&self) -> ~str { ::bool::to_str(*self) }
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}
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impl ToStr for () {
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#[inline(always)]
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fn to_str(&self) -> ~str { ~"()" }
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}
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impl<A:ToStr> ToStr for (A,) {
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#[inline(always)]
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fn to_str(&self) -> ~str {
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match *self {
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(ref a,) => {
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~"(" + a.to_str() + ~", " + ~")"
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}
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}
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}
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}
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impl<A:ToStr,B:ToStr> ToStr for (A, B) {
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#[inline(always)]
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fn to_str(&self) -> ~str {
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// FIXME(#4760): this causes an llvm assertion
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//let &(ref a, ref b) = self;
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match *self {
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(ref a, ref b) => {
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~"(" + a.to_str() + ~", " + b.to_str() + ~")"
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}
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}
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}
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}
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impl<A:ToStr,B:ToStr,C:ToStr> ToStr for (A, B, C) {
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#[inline(always)]
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fn to_str(&self) -> ~str {
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// FIXME(#4760): this causes an llvm assertion
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//let &(ref a, ref b, ref c) = self;
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match *self {
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(ref a, ref b, ref c) => {
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fmt!("(%s, %s, %s)",
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(*a).to_str(),
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(*b).to_str(),
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(*c).to_str()
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)
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}
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}
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}
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}
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impl<'self,A:ToStr> ToStr for &'self [A] {
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#[inline(always)]
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fn to_str(&self) -> ~str {
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let mut acc = ~"[", first = true;
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for self.each |elt| {
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if first { first = false; }
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else { str::push_str(&mut acc, ~", "); }
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str::push_str(&mut acc, elt.to_str());
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}
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str::push_char(&mut acc, ']');
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acc
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}
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}
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impl<A:ToStr> ToStr for ~[A] {
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#[inline(always)]
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fn to_str(&self) -> ~str {
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let mut acc = ~"[", first = true;
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for self.each |elt| {
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if first { first = false; }
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else { str::push_str(&mut acc, ~", "); }
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str::push_str(&mut acc, elt.to_str());
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}
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str::push_char(&mut acc, ']');
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acc
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}
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}
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impl<A:ToStr> ToStr for @[A] {
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#[inline(always)]
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fn to_str(&self) -> ~str {
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let mut acc = ~"[", first = true;
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for self.each |elt| {
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if first { first = false; }
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else { str::push_str(&mut acc, ~", "); }
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str::push_str(&mut acc, elt.to_str());
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}
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str::push_char(&mut acc, ']');
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acc
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}
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}
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#[cfg(test)]
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#[allow(non_implicitly_copyable_typarams)]
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mod tests {
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#[test]
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fn test_simple_types() {
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assert!(1i.to_str() == ~"1");
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assert!((-1i).to_str() == ~"-1");
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assert!(200u.to_str() == ~"200");
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assert!(2u8.to_str() == ~"2");
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assert!(true.to_str() == ~"true");
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assert!(false.to_str() == ~"false");
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assert!(().to_str() == ~"()");
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assert!((~"hi").to_str() == ~"hi");
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assert!((@"hi").to_str() == ~"hi");
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}
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#[test]
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fn test_tuple_types() {
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assert!((1, 2).to_str() == ~"(1, 2)");
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assert!((~"a", ~"b", false).to_str() == ~"(a, b, false)");
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assert!(((), ((), 100)).to_str() == ~"((), ((), 100))");
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}
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#[test]
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fn test_vectors() {
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let x: ~[int] = ~[];
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assert!(x.to_str() == ~"[]");
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assert!((~[1]).to_str() == ~"[1]");
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assert!((~[1, 2, 3]).to_str() == ~"[1, 2, 3]");
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assert!((~[~[], ~[1], ~[1, 1]]).to_str() ==
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~"[[], [1], [1, 1]]");
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}
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}
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