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https://github.com/carbon-language/carbon-lang.git
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Jon Ross-Perkins
3f799bd987
Echoing what was added in #5608, updating existing uses. Unfortunately there's divergent behavior for operators versus constructors, so keeping the nolint on those.
71 lines
2.4 KiB
C++
71 lines
2.4 KiB
C++
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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#ifndef CARBON_TOOLCHAIN_DIAGNOSTICS_FORMAT_PROVIDERS_H_
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#define CARBON_TOOLCHAIN_DIAGNOSTICS_FORMAT_PROVIDERS_H_
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#include "common/ostream.h"
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#include "llvm/Support/FormatVariadicDetails.h"
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namespace Carbon::Diagnostics {
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// Selects a formatv string based on the value.
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//
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// Supported format styles are:
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// - None, as in `{0}`. This uses standard integer formatting.
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// - Selector, as in `{0:true|false}`. The output string used is separated by a
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// `|`, with the true case first. the example would yield standard bool
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// formatting.
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struct BoolAsSelect {
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explicit(false) BoolAsSelect(bool value) : value(value) {}
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bool value;
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};
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// Selects a formatv string based on the value.
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//
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// Supported format styles are:
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// - None, as in `{0}`. This uses standard integer formatting.
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// - Selector, as in `{0:=0:zero|:default}`. This is detailed below.
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// - Plural `s`, as in `{0:s}`. This outputs an `s` when the value is not 1,
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// equivalent to `{0:=1:|:s}`.
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//
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// The style is a series of match cases, separated by `|`. Each case is a pair
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// formatted as `<selector>:<output string>`.
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//
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// Supported selectors are:
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// - `=<value>`: Matches when the value is correct.
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// - Empty for the default. This is optional, although it's a fatal error to not
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// handle a value. If provided, it must be last.
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//
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// For example, `{0:=0:zero|=1:one|:other}` breaks down into:
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// - `=0` -> `zero`
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// - `=1` -> `one`
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// - default -> `other`
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//
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// As another example, `{0:=1:is|:are}` is a way to handle plural-based output.
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struct IntAsSelect {
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explicit(false) IntAsSelect(int value) : value(value) {}
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int value;
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};
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} // namespace Carbon::Diagnostics
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// See Diagnostics::BoolAsSelect.
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template <>
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struct llvm::format_provider<Carbon::Diagnostics::BoolAsSelect> {
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static auto format(const Carbon::Diagnostics::BoolAsSelect& wrapper,
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raw_ostream& out, StringRef style) -> void;
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};
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// See Diagnostics::IntAsSelect.
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template <>
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struct llvm::format_provider<Carbon::Diagnostics::IntAsSelect> {
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static auto format(const Carbon::Diagnostics::IntAsSelect& wrapper,
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raw_ostream& out, StringRef style) -> void;
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};
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#endif // CARBON_TOOLCHAIN_DIAGNOSTICS_FORMAT_PROVIDERS_H_
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