Change how the 0 flag works in format!
#40241
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r? @sfackler (rust_highfive has picked a reviewer for you, use r? to override) |
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Please don't merge it yet as I completely forgot about floats. I was slightly misled by the current documentation of |
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I updated the logic for floats as well. |
alexcrichton
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Thanks for the PR @Sawyer47! I've tagged this with |
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@rust-lang/libs if you've got opinions ahead of time, feel free to comment here! I'm fine landing this PR personally. |
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📌 Commit 6652cef has been approved by |
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🔒 Merge conflict |
Now it always implies right-alignment, so that padding zeroes are placed after the sign (if any) and before the digits. In other words, it always takes precedence over explicitly specified `[[fill]align]`. This also affects the '#' flag: zeroes are placed after the prefix (0b, 0o, 0x) and before the digits.
:05 :<05 :>05 :^05
before |-0001| |-1000| |-0001| |-0100|
after |-0001| |-0001| |-0001| |-0001|
:#05x :<#05x :>#05x :^#05x
before |0x001| |0x100| |000x1| |0x010|
after |0x001| |0x001| |0x001| |0x001|
Fixes rust-lang#39997 [breaking-change]
Now it always implies right-alignment, so that padding zeroes are placed after the sign (if any) and before the digits. In other words, it always takes precedence over explicitly specified `[[fill]align]`.
:06 :<06 :>06 :^06
before |-001.2| |-1.200| |-001.2| |-01.20|
after |-001.2| |-001.2| |-001.2| |-001.2|
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@bors: r+ |
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📌 Commit 8065486 has been approved by |
frewsxcv
added a commit
to frewsxcv/rust
that referenced
this pull request
Mar 18, 2017
Change how the `0` flag works in format!
Now it always implies right-alignment, so that padding zeroes are placed after the sign (if any) and before the digits. In other words, it always takes precedence over explicitly specified `[[fill]align]`. This also affects the '#' flag: zeroes are placed after the prefix (0b, 0o, 0x) and before the digits.
Here's a short summary of how similar format strings work in Python and Rust:
```
:05 :<05 :>05 :^05
Python 3.6 |-0001| |-1000| |000-1| |0-100|
Rust before |-0001| |-1000| |-0001| |-0100|
Rust after |-0001| |-0001| |-0001| |-0001|
:#05x :<#05x :>#05x :^#05x
Python 3.6 |0x001| |0x100| |000x1| |00x10|
Rust before |0x001| |0x100| |000x1| |0x010|
Rust after |0x001| |0x001| |0x001| |0x001|
```
Fixes rust-lang#39997 [breaking-change]
arielb1
pushed a commit
to arielb1/rust
that referenced
this pull request
Mar 18, 2017
Change how the `0` flag works in format!
Now it always implies right-alignment, so that padding zeroes are placed after the sign (if any) and before the digits. In other words, it always takes precedence over explicitly specified `[[fill]align]`. This also affects the '#' flag: zeroes are placed after the prefix (0b, 0o, 0x) and before the digits.
Here's a short summary of how similar format strings work in Python and Rust:
```
:05 :<05 :>05 :^05
Python 3.6 |-0001| |-1000| |000-1| |0-100|
Rust before |-0001| |-1000| |-0001| |-0100|
Rust after |-0001| |-0001| |-0001| |-0001|
:#05x :<#05x :>#05x :^#05x
Python 3.6 |0x001| |0x100| |000x1| |00x10|
Rust before |0x001| |0x100| |000x1| |0x010|
Rust after |0x001| |0x001| |0x001| |0x001|
```
Fixes rust-lang#39997 [breaking-change]
arielb1
pushed a commit
to arielb1/rust
that referenced
this pull request
Mar 19, 2017
Change how the `0` flag works in format!
Now it always implies right-alignment, so that padding zeroes are placed after the sign (if any) and before the digits. In other words, it always takes precedence over explicitly specified `[[fill]align]`. This also affects the '#' flag: zeroes are placed after the prefix (0b, 0o, 0x) and before the digits.
Here's a short summary of how similar format strings work in Python and Rust:
```
:05 :<05 :>05 :^05
Python 3.6 |-0001| |-1000| |000-1| |0-100|
Rust before |-0001| |-1000| |-0001| |-0100|
Rust after |-0001| |-0001| |-0001| |-0001|
:#05x :<#05x :>#05x :^#05x
Python 3.6 |0x001| |0x100| |000x1| |00x10|
Rust before |0x001| |0x100| |000x1| |0x010|
Rust after |0x001| |0x001| |0x001| |0x001|
```
Fixes rust-lang#39997 [breaking-change]
frewsxcv
added a commit
to frewsxcv/rust
that referenced
this pull request
Mar 19, 2017
Change how the `0` flag works in format!
Now it always implies right-alignment, so that padding zeroes are placed after the sign (if any) and before the digits. In other words, it always takes precedence over explicitly specified `[[fill]align]`. This also affects the '#' flag: zeroes are placed after the prefix (0b, 0o, 0x) and before the digits.
Here's a short summary of how similar format strings work in Python and Rust:
```
:05 :<05 :>05 :^05
Python 3.6 |-0001| |-1000| |000-1| |0-100|
Rust before |-0001| |-1000| |-0001| |-0100|
Rust after |-0001| |-0001| |-0001| |-0001|
:#05x :<#05x :>#05x :^#05x
Python 3.6 |0x001| |0x100| |000x1| |00x10|
Rust before |0x001| |0x100| |000x1| |0x010|
Rust after |0x001| |0x001| |0x001| |0x001|
```
Fixes rust-lang#39997 [breaking-change]
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⌛ Testing commit 8065486 with merge bd14bc3... |
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💔 Test failed - status-travis |
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… On Sun, Mar 19, 2017 at 5:34 AM, bors ***@***.***> wrote:
💔 Test failed - status-travis
<https://travis-ci.org/rust-lang/rust/builds/212634242>
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frewsxcv
added a commit
to frewsxcv/rust
that referenced
this pull request
Mar 20, 2017
Change how the `0` flag works in format!
Now it always implies right-alignment, so that padding zeroes are placed after the sign (if any) and before the digits. In other words, it always takes precedence over explicitly specified `[[fill]align]`. This also affects the '#' flag: zeroes are placed after the prefix (0b, 0o, 0x) and before the digits.
Here's a short summary of how similar format strings work in Python and Rust:
```
:05 :<05 :>05 :^05
Python 3.6 |-0001| |-1000| |000-1| |0-100|
Rust before |-0001| |-1000| |-0001| |-0100|
Rust after |-0001| |-0001| |-0001| |-0001|
:#05x :<#05x :>#05x :^#05x
Python 3.6 |0x001| |0x100| |000x1| |00x10|
Rust before |0x001| |0x100| |000x1| |0x010|
Rust after |0x001| |0x001| |0x001| |0x001|
```
Fixes rust-lang#39997 [breaking-change]
|
⌛ Testing commit 8065486 with merge 9902af4... |
|
💔 Test failed - status-appveyor |
bors
added a commit
that referenced
this pull request
Mar 20, 2017
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Now it always implies right-alignment, so that padding zeroes are placed after the sign (if any) and before the digits. In other words, it always takes precedence over explicitly specified
[[fill]align]. This also affects the '#' flag: zeroes are placed after the prefix (0b, 0o, 0x) and before the digits.Here's a short summary of how similar format strings work in Python and Rust:
Fixes #39997 [breaking-change]