Commit Graph

7 Commits

Author SHA1 Message Date
Mark de Wever 2b8b48c5a0 [libc++][format] Disable default formatter.
[format.formatter.spec]/5 lists the requirements for the default
formatter. The original implementation didn't implement this. This
implements the default formatter according to the Standard.

This adds additional test to validate the default formatter is disabled
and the required standard formatters are enabled.

While adding the tests it seems the formatters needed a constraint for the
character types they were valid for.

Implements parts of:
- P0645 Text Formatting

Depends on D115988

Reviewed By: ldionne, #libc

Differential Revision: https://reviews.llvm.org/D115989
2022-01-24 18:14:41 +01:00
Mark de Wever db2944e34b [libc++][format] Adds formatter floating-point.
This properly implements the formatter for floating-point types.

Completes:
- P1652R1 Printf corner cases in std::format
- LWG 3250 std::format: # (alternate form) for NaN and inf
- LWG 3243 std::format and negative zeroes

Implements parts of:
- P0645 Text Formatting

Reviewed By: #libc, ldionne, vitaut

Differential Revision: https://reviews.llvm.org/D114001
2022-01-24 18:12:24 +01:00
Mark de Wever ed86610c7b [libc++][nfc] Move functions to a generic place.
This allows the floating-point formatter to use the same functions as
the integral formatter. This was tested in D114001.
2021-11-19 16:38:35 +01:00
Mark de Wever 3e9689d72c [libc++][format] Adds integer formatter.
Implements the formatter for all fundamental integer types
(except `char`, `wchar_t`, and `bool`).
[format.formatter.spec]/2.3
For each charT, for each cv-unqualified arithmetic type ArithmeticT other
than char, wchar_t, char8_t, char16_t, or char32_t, a specialization
```
  template<> struct formatter<ArithmeticT, charT>;
```
This removes the stub implemented in D96664.

As an extension it adds partial support for 128-bit integer types.

Implements parts of:
- P0645 Text Formatting
- P1652 Printf corner cases in std::format

Completes:
- LWG-3248 #b, #B, #o, #x, and #X presentation types misformat negative numbers

Reviewed By: #libc, ldionne, vitaut

Differential Revision: https://reviews.llvm.org/D103433
2021-10-07 17:07:51 +02:00
Mark de Wever d550930afc [libc++][format] Adds string formatter.
Implements the formatter for all string types.
[format.formatter.spec]/2.2
For each charT, the string type specializations
```
  template<> struct formatter<charT*, charT>;
  template<> struct formatter<const charT*, charT>;
  template<size_t N> struct formatter<const charT[N], charT>;
  template<class traits, class Allocator>
    struct formatter<basic_string<charT, traits, Allocator>, charT>;
  template<class traits>
    struct formatter<basic_string_view<charT, traits>, charT>;
```
This removes the stub implemented in D96664.

Implements parts of:
- P0645 Text Formatting
- P1868 width: clarifying units of width and precision in std::format

Reviewed By: #libc, ldionne, vitaut

Differential Revision: https://reviews.llvm.org/D103425
2021-10-07 17:03:04 +02:00
Mark de Wever a04a6ce772 [libc++][format] Adds parser std-format-spec.
This implements the generic std.format.spec framework for all types.

The Unicode support will be added in a separate patch.

Implements parts of:
- P0645 Text Formatting

Completes:
- LWG-3242 std::format: missing rules for arg-id in width and precision
- P1892 Extended locale-specific presentation specifiers for std::format

Reviewed By: #libc, ldionne, vitaut

Differential Revision: https://reviews.llvm.org/D103368
2021-09-21 18:29:58 +02:00
Mark de Wever d7444d9f41 [libc++][format] Implement formatters.
This implements the initial version of the `std::formatter` class and its specializations. It also implements the following formatting functions:
- `format`
- `vformat`
- `format_to`
- `vformat_to`
- `format_to_n`
- `formatted_size`

All functions have a `char` and `wchar_t` version. Parsing the format-spec and
using the parsed format-spec hasn't been implemented. The code isn't optimized,
neither for speed, nor for size.

The goal is to have the rudimentary basics working, which can be used as a
basis to improve upon. The formatters used in this commit are simple stubs that
will be replaced by real formatters in later commits.

The formatters that are slated to be replaced in this patch series don't have
an availability macro to avoid merge conflicts.

Note the formatter for `bool` uses `0` and `1` instead of "false" and
"true". This will be fixed when the stub is replaced with a real
formatter.

Implements parts of:
- P0645 Text Formatting

Completes:
- LWG3539 format_to must not copy models of output_iterator<const charT&>

Reviewed By: ldionne, #libc, vitaut

Differential Revision: https://reviews.llvm.org/D96664
2021-09-04 11:41:08 +02:00