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Delegate {} to Default instead of Poly

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By using a separate trait this is overridable on a per-type basis and makes room
for the possibility of even more arguments passed in for the future.
This commit is contained in:
Alex Crichton 2013-08-14 20:40:15 -07:00
parent 109274426a
commit 22c7bbfd0c
4 changed files with 100 additions and 29 deletions
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30
src/test/run-pass/ifmt.rs
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@ -25,16 +25,36 @@ pub fn main() {
macro_rules! t(($a:expr, $b:expr) => { assert_eq!($a, $b.to_owned()) })
// Make sure there's a poly formatter that takes anything
t!(ifmt!("{}", 1), "1");
t!(ifmt!("{}", A), "{}");
t!(ifmt!("{}", ()), "()");
t!(ifmt!("{}", @(~1, "foo")), "@(~1, \"foo\")");
t!(ifmt!("{:?}", 1), "1");
t!(ifmt!("{:?}", A), "{}");
t!(ifmt!("{:?}", ()), "()");
t!(ifmt!("{:?}", @(~1, "foo")), "@(~1, \"foo\")");
// Various edge cases without formats
t!(ifmt!(""), "");
t!(ifmt!("hello"), "hello");
t!(ifmt!("hello \\{"), "hello {");
// default formatters should work
t!(ifmt!("{}", 1i), "1");
t!(ifmt!("{}", 1i8), "1");
t!(ifmt!("{}", 1i16), "1");
t!(ifmt!("{}", 1i32), "1");
t!(ifmt!("{}", 1i64), "1");
t!(ifmt!("{}", 1u), "1");
t!(ifmt!("{}", 1u8), "1");
t!(ifmt!("{}", 1u16), "1");
t!(ifmt!("{}", 1u32), "1");
t!(ifmt!("{}", 1u64), "1");
t!(ifmt!("{}", 1.0f), "1");
t!(ifmt!("{}", 1.0f32), "1");
t!(ifmt!("{}", 1.0f64), "1");
t!(ifmt!("{}", "a"), "a");
t!(ifmt!("{}", ~"a"), "a");
t!(ifmt!("{}", @"a"), "a");
t!(ifmt!("{}", false), "false");
t!(ifmt!("{}", 'a'), "a");
// At least exercise all the formats
t!(ifmt!("{:b}", true), "true");
t!(ifmt!("{:c}", '☃'), "☃");
@ -56,7 +76,7 @@ pub fn main() {
t!(ifmt!("{foo} {bar}", foo=0, bar=1), "0 1");
t!(ifmt!("{foo} {1} {bar} {0}", 0, 1, foo=2, bar=3), "2 1 3 0");
t!(ifmt!("{} {0:s}", "a"), "a a");
t!(ifmt!("{} {0}", "a"), "\"a\" \"a\"");
t!(ifmt!("{} {0}", "a"), "a a");
// Methods should probably work
t!(ifmt!("{0, plural, =1{a#} =2{b#} zero{c#} other{d#}}", 0u), "c0");