ladybird/AK/Format.h
Timothy Flynn 5063e218af AK: Move the AK::FixedPoint formatter to FixedPoint.h
This does not need to be defined in Format.h. This causes FixedPoint.h
to be included everywhere. This is particularly going to be an issue
when trying to include <CoreServices/CoreServices.h> on macOS. The macOS
SDK defines its own FixedPoint structure which will conflict with ours.
2023-01-19 11:29:48 +00:00

740 lines
22 KiB
C++

/*
* Copyright (c) 2020, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/CheckedFormatString.h>
#include <AK/AllOf.h>
#include <AK/AnyOf.h>
#include <AK/Array.h>
#include <AK/Error.h>
#include <AK/Forward.h>
#include <AK/Optional.h>
#include <AK/StringView.h>
#ifndef KERNEL
# include <stdio.h>
# include <string.h>
#endif
namespace AK {
class TypeErasedFormatParams;
class FormatParser;
class FormatBuilder;
template<typename T, typename = void>
struct Formatter {
using __no_formatter_defined = void;
};
enum AllowDebugOnlyFormatters {
No,
Yes
};
template<typename T, typename = void>
inline constexpr bool HasFormatter = true;
template<typename T>
inline constexpr bool HasFormatter<T, typename Formatter<T>::__no_formatter_defined> = false;
template<typename Formatter>
inline constexpr bool is_debug_only_formatter()
{
constexpr bool has_is_debug_only = requires(Formatter const& formatter) { formatter.is_debug_only(); };
if constexpr (has_is_debug_only)
return Formatter::is_debug_only();
return false;
}
template<typename T>
concept Formattable = HasFormatter<T>;
constexpr size_t max_format_arguments = 256;
struct TypeErasedParameter {
enum class Type {
UInt8,
UInt16,
UInt32,
UInt64,
Int8,
Int16,
Int32,
Int64,
Custom
};
template<size_t size, bool is_unsigned>
static consteval Type get_type_from_size()
{
if constexpr (is_unsigned) {
if constexpr (size == 1)
return Type::UInt8;
if constexpr (size == 2)
return Type::UInt16;
if constexpr (size == 4)
return Type::UInt32;
if constexpr (size == 8)
return Type::UInt64;
} else {
if constexpr (size == 1)
return Type::Int8;
if constexpr (size == 2)
return Type::Int16;
if constexpr (size == 4)
return Type::Int32;
if constexpr (size == 8)
return Type::Int64;
}
VERIFY_NOT_REACHED();
}
template<typename T>
static consteval Type get_type()
{
if constexpr (IsIntegral<T>)
return get_type_from_size<sizeof(T), IsUnsigned<T>>();
else
return Type::Custom;
}
template<typename Visitor>
constexpr auto visit(Visitor&& visitor) const
{
switch (type) {
case TypeErasedParameter::Type::UInt8:
return visitor(*static_cast<u8 const*>(value));
case TypeErasedParameter::Type::UInt16:
return visitor(*static_cast<u16 const*>(value));
case TypeErasedParameter::Type::UInt32:
return visitor(*static_cast<u32 const*>(value));
case TypeErasedParameter::Type::UInt64:
return visitor(*static_cast<u64 const*>(value));
case TypeErasedParameter::Type::Int8:
return visitor(*static_cast<i8 const*>(value));
case TypeErasedParameter::Type::Int16:
return visitor(*static_cast<i16 const*>(value));
case TypeErasedParameter::Type::Int32:
return visitor(*static_cast<i32 const*>(value));
case TypeErasedParameter::Type::Int64:
return visitor(*static_cast<i64 const*>(value));
default:
TODO();
}
}
constexpr size_t to_size() const
{
return visit([]<typename T>(T value) {
if constexpr (sizeof(T) > sizeof(size_t))
VERIFY(value < NumericLimits<size_t>::max());
if constexpr (IsSigned<T>)
VERIFY(value > 0);
return static_cast<size_t>(value);
});
}
// FIXME: Getters and setters.
void const* value;
Type type;
ErrorOr<void> (*formatter)(TypeErasedFormatParams&, FormatBuilder&, FormatParser&, void const* value);
};
class FormatBuilder {
public:
enum class Align {
Default,
Left,
Center,
Right,
};
enum class SignMode {
OnlyIfNeeded,
Always,
Reserved,
Default = OnlyIfNeeded,
};
enum class RealNumberDisplayMode {
FixedPoint,
General,
Default = General,
};
explicit FormatBuilder(StringBuilder& builder)
: m_builder(builder)
{
}
ErrorOr<void> put_padding(char fill, size_t amount);
ErrorOr<void> put_literal(StringView value);
ErrorOr<void> put_string(
StringView value,
Align align = Align::Left,
size_t min_width = 0,
size_t max_width = NumericLimits<size_t>::max(),
char fill = ' ');
ErrorOr<void> put_u64(
u64 value,
u8 base = 10,
bool prefix = false,
bool upper_case = false,
bool zero_pad = false,
Align align = Align::Right,
size_t min_width = 0,
char fill = ' ',
SignMode sign_mode = SignMode::OnlyIfNeeded,
bool is_negative = false);
ErrorOr<void> put_i64(
i64 value,
u8 base = 10,
bool prefix = false,
bool upper_case = false,
bool zero_pad = false,
Align align = Align::Right,
size_t min_width = 0,
char fill = ' ',
SignMode sign_mode = SignMode::OnlyIfNeeded);
ErrorOr<void> put_fixed_point(
i64 integer_value,
u64 fraction_value,
u64 fraction_one,
u8 base = 10,
bool upper_case = false,
bool zero_pad = false,
Align align = Align::Right,
size_t min_width = 0,
size_t precision = 6,
char fill = ' ',
SignMode sign_mode = SignMode::OnlyIfNeeded,
RealNumberDisplayMode = RealNumberDisplayMode::Default);
#ifndef KERNEL
ErrorOr<void> put_f80(
long double value,
u8 base = 10,
bool upper_case = false,
Align align = Align::Right,
size_t min_width = 0,
size_t precision = 6,
char fill = ' ',
SignMode sign_mode = SignMode::OnlyIfNeeded,
RealNumberDisplayMode = RealNumberDisplayMode::Default);
ErrorOr<void> put_f64(
double value,
u8 base = 10,
bool upper_case = false,
bool zero_pad = false,
Align align = Align::Right,
size_t min_width = 0,
size_t precision = 6,
char fill = ' ',
SignMode sign_mode = SignMode::OnlyIfNeeded,
RealNumberDisplayMode = RealNumberDisplayMode::Default);
#endif
ErrorOr<void> put_hexdump(
ReadonlyBytes,
size_t width,
char fill = ' ');
StringBuilder const& builder() const
{
return m_builder;
}
StringBuilder& builder() { return m_builder; }
private:
StringBuilder& m_builder;
};
class TypeErasedFormatParams {
public:
Span<TypeErasedParameter const> parameters() const { return m_parameters; }
void set_parameters(Span<TypeErasedParameter const> parameters) { m_parameters = parameters; }
size_t take_next_index() { return m_next_index++; }
private:
Span<TypeErasedParameter const> m_parameters;
size_t m_next_index { 0 };
};
template<typename T>
ErrorOr<void> __format_value(TypeErasedFormatParams& params, FormatBuilder& builder, FormatParser& parser, void const* value)
{
Formatter<T> formatter;
formatter.parse(params, parser);
return formatter.format(builder, *static_cast<T const*>(value));
}
template<AllowDebugOnlyFormatters allow_debug_formatters, typename... Parameters>
class VariadicFormatParams : public TypeErasedFormatParams {
public:
static_assert(sizeof...(Parameters) <= max_format_arguments);
explicit VariadicFormatParams(Parameters const&... parameters)
: m_data({ TypeErasedParameter { &parameters, TypeErasedParameter::get_type<Parameters>(), __format_value<Parameters> }... })
{
constexpr bool any_debug_formatters = (is_debug_only_formatter<Formatter<Parameters>>() || ...);
static_assert(!any_debug_formatters || allow_debug_formatters == AllowDebugOnlyFormatters::Yes,
"You are attempting to use a debug-only formatter outside of a debug log! Maybe one of your format values is an ErrorOr<T>?");
this->set_parameters(m_data);
}
private:
Array<TypeErasedParameter, sizeof...(Parameters)> m_data;
};
// We use the same format for most types for consistency. This is taken directly from
// std::format. One difference is that we are not counting the width or sign towards the
// total width when calculating zero padding for numbers.
// https://en.cppreference.com/w/cpp/utility/format/formatter#Standard_format_specification
struct StandardFormatter {
enum class Mode {
Default,
Binary,
BinaryUppercase,
Decimal,
Octal,
Hexadecimal,
HexadecimalUppercase,
Character,
String,
Pointer,
FixedPoint,
Hexfloat,
HexfloatUppercase,
HexDump,
};
FormatBuilder::Align m_align = FormatBuilder::Align::Default;
FormatBuilder::SignMode m_sign_mode = FormatBuilder::SignMode::OnlyIfNeeded;
Mode m_mode = Mode::Default;
bool m_alternative_form = false;
char m_fill = ' ';
bool m_zero_pad = false;
Optional<size_t> m_width;
Optional<size_t> m_precision;
void parse(TypeErasedFormatParams&, FormatParser&);
};
template<Integral T>
struct Formatter<T> : StandardFormatter {
Formatter() = default;
explicit Formatter(StandardFormatter formatter)
: StandardFormatter(move(formatter))
{
}
ErrorOr<void> format(FormatBuilder&, T);
};
template<>
struct Formatter<StringView> : StandardFormatter {
Formatter() = default;
explicit Formatter(StandardFormatter formatter)
: StandardFormatter(move(formatter))
{
}
ErrorOr<void> format(FormatBuilder&, StringView);
};
template<typename T>
requires(HasFormatter<T>)
struct Formatter<Span<T const>> : StandardFormatter {
Formatter() = default;
explicit Formatter(StandardFormatter formatter)
: StandardFormatter(move(formatter))
{
}
ErrorOr<void> format(FormatBuilder& builder, Span<T const> value)
{
if (m_mode == Mode::Pointer) {
Formatter<FlatPtr> formatter { *this };
TRY(formatter.format(builder, reinterpret_cast<FlatPtr>(value.data())));
return {};
}
if (m_sign_mode != FormatBuilder::SignMode::Default)
VERIFY_NOT_REACHED();
if (m_alternative_form)
VERIFY_NOT_REACHED();
if (m_zero_pad)
VERIFY_NOT_REACHED();
if (m_mode != Mode::Default)
VERIFY_NOT_REACHED();
if (m_width.has_value() && m_precision.has_value())
VERIFY_NOT_REACHED();
m_width = m_width.value_or(0);
m_precision = m_precision.value_or(NumericLimits<size_t>::max());
Formatter<T> content_fmt;
TRY(builder.put_literal("[ "sv));
bool first = true;
for (auto& content : value) {
if (!first) {
TRY(builder.put_literal(", "sv));
content_fmt = Formatter<T> {};
}
first = false;
TRY(content_fmt.format(builder, content));
}
TRY(builder.put_literal(" ]"sv));
return {};
}
};
template<typename T>
requires(HasFormatter<T>)
struct Formatter<Span<T>> : Formatter<Span<T const>> {
ErrorOr<void> format(FormatBuilder& builder, Span<T> value)
{
return Formatter<Span<T const>>::format(builder, value);
}
};
template<typename T, size_t inline_capacity>
requires(HasFormatter<T>)
struct Formatter<Vector<T, inline_capacity>> : Formatter<Span<T const>> {
ErrorOr<void> format(FormatBuilder& builder, Vector<T, inline_capacity> const& value)
{
return Formatter<Span<T const>>::format(builder, value.span());
}
};
template<>
struct Formatter<ReadonlyBytes> : Formatter<StringView> {
ErrorOr<void> format(FormatBuilder& builder, ReadonlyBytes value)
{
if (m_mode == Mode::Pointer) {
Formatter<FlatPtr> formatter { *this };
return formatter.format(builder, reinterpret_cast<FlatPtr>(value.data()));
}
if (m_mode == Mode::Default || m_mode == Mode::HexDump) {
m_mode = Mode::HexDump;
return Formatter<StringView>::format(builder, value);
}
return Formatter<StringView>::format(builder, value);
}
};
template<>
struct Formatter<Bytes> : Formatter<ReadonlyBytes> {
};
// FIXME: Printing raw char pointers is inherently dangerous. Remove this and
// its users and prefer StringView over it.
template<>
struct Formatter<char const*> : Formatter<StringView> {
ErrorOr<void> format(FormatBuilder& builder, char const* value)
{
if (m_mode == Mode::Pointer) {
Formatter<FlatPtr> formatter { *this };
return formatter.format(builder, reinterpret_cast<FlatPtr>(value));
}
return Formatter<StringView>::format(builder, value != nullptr ? StringView { value, __builtin_strlen(value) } : "(null)"sv);
}
};
template<>
struct Formatter<char*> : Formatter<char const*> {
};
template<size_t Size>
struct Formatter<char[Size]> : Formatter<char const*> {
};
template<size_t Size>
struct Formatter<unsigned char[Size]> : Formatter<StringView> {
ErrorOr<void> format(FormatBuilder& builder, unsigned char const* value)
{
if (m_mode == Mode::Pointer) {
Formatter<FlatPtr> formatter { *this };
return formatter.format(builder, reinterpret_cast<FlatPtr>(value));
}
return Formatter<StringView>::format(builder, { value, Size });
}
};
template<>
struct Formatter<DeprecatedString> : Formatter<StringView> {
};
template<>
struct Formatter<DeprecatedFlyString> : Formatter<StringView> {
};
template<typename T>
struct Formatter<T*> : StandardFormatter {
ErrorOr<void> format(FormatBuilder& builder, T* value)
{
if (m_mode == Mode::Default)
m_mode = Mode::Pointer;
Formatter<FlatPtr> formatter { *this };
return formatter.format(builder, reinterpret_cast<FlatPtr>(value));
}
};
template<>
struct Formatter<char> : StandardFormatter {
ErrorOr<void> format(FormatBuilder&, char);
};
template<>
struct Formatter<wchar_t> : StandardFormatter {
ErrorOr<void> format(FormatBuilder& builder, wchar_t);
};
template<>
struct Formatter<bool> : StandardFormatter {
ErrorOr<void> format(FormatBuilder&, bool);
};
#ifndef KERNEL
template<>
struct Formatter<float> : StandardFormatter {
ErrorOr<void> format(FormatBuilder&, float value);
};
template<>
struct Formatter<double> : StandardFormatter {
Formatter() = default;
explicit Formatter(StandardFormatter formatter)
: StandardFormatter(formatter)
{
}
ErrorOr<void> format(FormatBuilder&, double);
};
template<>
struct Formatter<long double> : StandardFormatter {
Formatter() = default;
explicit Formatter(StandardFormatter formatter)
: StandardFormatter(formatter)
{
}
ErrorOr<void> format(FormatBuilder&, long double value);
};
#endif
template<>
struct Formatter<nullptr_t> : Formatter<FlatPtr> {
ErrorOr<void> format(FormatBuilder& builder, nullptr_t)
{
if (m_mode == Mode::Default)
m_mode = Mode::Pointer;
return Formatter<FlatPtr>::format(builder, 0);
}
};
ErrorOr<void> vformat(StringBuilder&, StringView fmtstr, TypeErasedFormatParams&);
#ifndef KERNEL
void vout(FILE*, StringView fmtstr, TypeErasedFormatParams&, bool newline = false);
template<typename... Parameters>
void out(FILE* file, CheckedFormatString<Parameters...>&& fmtstr, Parameters const&... parameters)
{
VariadicFormatParams<AllowDebugOnlyFormatters::Yes, Parameters...> variadic_format_params { parameters... };
vout(file, fmtstr.view(), variadic_format_params);
}
template<typename... Parameters>
void outln(FILE* file, CheckedFormatString<Parameters...>&& fmtstr, Parameters const&... parameters)
{
VariadicFormatParams<AllowDebugOnlyFormatters::Yes, Parameters...> variadic_format_params { parameters... };
vout(file, fmtstr.view(), variadic_format_params, true);
}
inline void outln(FILE* file) { fputc('\n', file); }
template<typename... Parameters>
void out(CheckedFormatString<Parameters...>&& fmtstr, Parameters const&... parameters) { out(stdout, move(fmtstr), parameters...); }
template<typename... Parameters>
void outln(CheckedFormatString<Parameters...>&& fmtstr, Parameters const&... parameters) { outln(stdout, move(fmtstr), parameters...); }
inline void outln() { outln(stdout); }
# define outln_if(flag, fmt, ...) \
do { \
if constexpr (flag) \
outln(fmt, ##__VA_ARGS__); \
} while (0)
template<typename... Parameters>
void warn(CheckedFormatString<Parameters...>&& fmtstr, Parameters const&... parameters)
{
out(stderr, move(fmtstr), parameters...);
}
template<typename... Parameters>
void warnln(CheckedFormatString<Parameters...>&& fmtstr, Parameters const&... parameters) { outln(stderr, move(fmtstr), parameters...); }
inline void warnln() { outln(stderr); }
# define warnln_if(flag, fmt, ...) \
do { \
if constexpr (flag) \
warnln(fmt, ##__VA_ARGS__); \
} while (0)
#endif
void vdbgln(StringView fmtstr, TypeErasedFormatParams&);
template<typename... Parameters>
void dbgln(CheckedFormatString<Parameters...>&& fmtstr, Parameters const&... parameters)
{
VariadicFormatParams<AllowDebugOnlyFormatters::Yes, Parameters...> variadic_format_params { parameters... };
vdbgln(fmtstr.view(), variadic_format_params);
}
inline void dbgln() { dbgln(""); }
void set_debug_enabled(bool);
#ifdef KERNEL
void vdmesgln(StringView fmtstr, TypeErasedFormatParams&);
template<typename... Parameters>
void dmesgln(CheckedFormatString<Parameters...>&& fmt, Parameters const&... parameters)
{
VariadicFormatParams<AllowDebugOnlyFormatters::Yes, Parameters...> variadic_format_params { parameters... };
vdmesgln(fmt.view(), variadic_format_params);
}
void v_critical_dmesgln(StringView fmtstr, TypeErasedFormatParams&);
// be very careful to not cause any allocations here, since we could be in
// a very unstable situation
template<typename... Parameters>
void critical_dmesgln(CheckedFormatString<Parameters...>&& fmt, Parameters const&... parameters)
{
VariadicFormatParams<AllowDebugOnlyFormatters::Yes, Parameters...> variadic_format_params { parameters... };
v_critical_dmesgln(fmt.view(), variadic_format_params);
}
#endif
template<typename T>
class FormatIfSupported {
public:
explicit FormatIfSupported(T const& value)
: m_value(value)
{
}
T const& value() const { return m_value; }
private:
T const& m_value;
};
template<typename T, bool Supported = false>
struct __FormatIfSupported : Formatter<StringView> {
ErrorOr<void> format(FormatBuilder& builder, FormatIfSupported<T> const&)
{
return Formatter<StringView>::format(builder, "?"sv);
}
};
template<typename T>
struct __FormatIfSupported<T, true> : Formatter<T> {
ErrorOr<void> format(FormatBuilder& builder, FormatIfSupported<T> const& value)
{
return Formatter<T>::format(builder, value.value());
}
};
template<typename T>
struct Formatter<FormatIfSupported<T>> : __FormatIfSupported<T, HasFormatter<T>> {
};
// This is a helper class, the idea is that if you want to implement a formatter you can inherit
// from this class to "break down" the formatting.
struct FormatString {
};
template<>
struct Formatter<FormatString> : Formatter<StringView> {
template<typename... Parameters>
ErrorOr<void> format(FormatBuilder& builder, StringView fmtstr, Parameters const&... parameters)
{
VariadicFormatParams<AllowDebugOnlyFormatters::No, Parameters...> variadic_format_params { parameters... };
return vformat(builder, fmtstr, variadic_format_params);
}
ErrorOr<void> vformat(FormatBuilder& builder, StringView fmtstr, TypeErasedFormatParams& params);
};
template<>
struct Formatter<Error> : Formatter<FormatString> {
ErrorOr<void> format(FormatBuilder& builder, Error const& error)
{
#if defined(AK_OS_SERENITY) && defined(KERNEL)
if (error.is_errno())
return Formatter<FormatString>::format(builder, "Error(errno={})"sv, error.code());
return Formatter<FormatString>::format(builder, "Error({})"sv, error.string_literal());
#else
if (error.is_syscall())
return Formatter<FormatString>::format(builder, "{}: {} (errno={})"sv, error.string_literal(), strerror(error.code()), error.code());
if (error.is_errno())
return Formatter<FormatString>::format(builder, "{} (errno={})"sv, strerror(error.code()), error.code());
return Formatter<FormatString>::format(builder, "{}"sv, error.string_literal());
#endif
}
};
template<typename T, typename ErrorType>
struct Formatter<ErrorOr<T, ErrorType>> : Formatter<FormatString> {
static constexpr bool is_debug_only() { return true; }
ErrorOr<void> format(FormatBuilder& builder, ErrorOr<T, ErrorType> const& error_or)
{
if (error_or.is_error())
return Formatter<FormatString>::format(builder, "{}"sv, error_or.error());
return Formatter<FormatString>::format(builder, "{{{}}}"sv, error_or.value());
}
};
} // namespace AK
#if USING_AK_GLOBALLY
# ifdef KERNEL
using AK::critical_dmesgln;
using AK::dmesgln;
# else
using AK::out;
using AK::outln;
using AK::warn;
using AK::warnln;
# endif
using AK::dbgln;
using AK::CheckedFormatString;
using AK::FormatIfSupported;
using AK::FormatString;
# define dbgln_if(flag, fmt, ...) \
do { \
if constexpr (flag) \
dbgln(fmt, ##__VA_ARGS__); \
} while (0)
#endif