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Build a few extra features into format! parsing

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* Allow named parameters to specify width/precision
* Intepret the format string '0$' as "width is the 0th argument" instead of
  thinking the lone '0' was the sign-aware-zero-padding flag. To get both you'd
  need to put '00$' which makes more sense if you want both to happen.

Closes #9669
This commit is contained in:
Alex Crichton 2013-10-12 20:00:58 -07:00
parent a84c2999c9
commit fc06f7922d
5 changed files with 155 additions and 23 deletions
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3
src/test/run-pass/ifmt.rs
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@ -119,7 +119,10 @@ pub fn main() {
t!(format!("{:0>2s}", "a"), "0a");
t!(format!("{:.*s}", 4, "aaaaaaaaaaaaaaaaaa"), "aaaa");
t!(format!("{:.1$s}", "aaaaaaaaaaaaaaaaaa", 4), "aaaa");
t!(format!("{:.a$s}", "aaaaaaaaaaaaaaaaaa", a=4), "aaaa");
t!(format!("{:1$s}", "a", 4), "a ");
t!(format!("{1:0$s}", 4, "a"), "a ");
t!(format!("{:a$s}", "a", a=4), "a ");
t!(format!("{:-#s}", "a"), "a");
t!(format!("{:+#s}", "a"), "a");