mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-11-21 23:20:20 +00:00
72ea046b68
`vformat()` can now accept format specifiers of the form
{:'[numeric-type]}. This will output a number with a comma separator
every 3 digits.
For example:
`dbgln("{:'d}", 9999999);` will output 9,999,999.
Binary, octal and hexadecimal numbers can also use this feature, for
example:
`dbgln("{:'x}", 0xffffffff);` will output ff,fff,fff.
744 lines
22 KiB
C++
744 lines
22 KiB
C++
/*
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* Copyright (c) 2020, the SerenityOS developers.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/CheckedFormatString.h>
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#include <AK/AllOf.h>
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#include <AK/AnyOf.h>
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#include <AK/Array.h>
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#include <AK/Error.h>
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#include <AK/Forward.h>
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#include <AK/Optional.h>
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#include <AK/StringView.h>
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#ifndef KERNEL
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# include <stdio.h>
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# include <string.h>
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#endif
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namespace AK {
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class TypeErasedFormatParams;
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class FormatParser;
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class FormatBuilder;
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template<typename T, typename = void>
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struct Formatter {
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using __no_formatter_defined = void;
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};
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enum AllowDebugOnlyFormatters {
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No,
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Yes
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};
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template<typename T, typename = void>
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inline constexpr bool HasFormatter = true;
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template<typename T>
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inline constexpr bool HasFormatter<T, typename Formatter<T>::__no_formatter_defined> = false;
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template<typename Formatter>
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inline constexpr bool is_debug_only_formatter()
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{
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constexpr bool has_is_debug_only = requires(Formatter const& formatter) { formatter.is_debug_only(); };
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if constexpr (has_is_debug_only)
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return Formatter::is_debug_only();
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return false;
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}
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template<typename T>
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concept Formattable = HasFormatter<T>;
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constexpr size_t max_format_arguments = 256;
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struct TypeErasedParameter {
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enum class Type {
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UInt8,
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UInt16,
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UInt32,
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UInt64,
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Int8,
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Int16,
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Int32,
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Int64,
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Custom
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};
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template<size_t size, bool is_unsigned>
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static consteval Type get_type_from_size()
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{
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if constexpr (is_unsigned) {
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if constexpr (size == 1)
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return Type::UInt8;
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if constexpr (size == 2)
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return Type::UInt16;
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if constexpr (size == 4)
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return Type::UInt32;
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if constexpr (size == 8)
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return Type::UInt64;
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} else {
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if constexpr (size == 1)
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return Type::Int8;
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if constexpr (size == 2)
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return Type::Int16;
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if constexpr (size == 4)
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return Type::Int32;
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if constexpr (size == 8)
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return Type::Int64;
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}
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VERIFY_NOT_REACHED();
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}
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template<typename T>
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static consteval Type get_type()
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{
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if constexpr (IsIntegral<T>)
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return get_type_from_size<sizeof(T), IsUnsigned<T>>();
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else
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return Type::Custom;
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}
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template<typename Visitor>
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constexpr auto visit(Visitor&& visitor) const
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{
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switch (type) {
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case TypeErasedParameter::Type::UInt8:
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return visitor(*static_cast<u8 const*>(value));
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case TypeErasedParameter::Type::UInt16:
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return visitor(*static_cast<u16 const*>(value));
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case TypeErasedParameter::Type::UInt32:
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return visitor(*static_cast<u32 const*>(value));
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case TypeErasedParameter::Type::UInt64:
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return visitor(*static_cast<u64 const*>(value));
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case TypeErasedParameter::Type::Int8:
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return visitor(*static_cast<i8 const*>(value));
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case TypeErasedParameter::Type::Int16:
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return visitor(*static_cast<i16 const*>(value));
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case TypeErasedParameter::Type::Int32:
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return visitor(*static_cast<i32 const*>(value));
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case TypeErasedParameter::Type::Int64:
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return visitor(*static_cast<i64 const*>(value));
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default:
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TODO();
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}
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}
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constexpr size_t to_size() const
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{
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return visit([]<typename T>(T value) {
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if constexpr (sizeof(T) > sizeof(size_t))
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VERIFY(value < NumericLimits<size_t>::max());
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if constexpr (IsSigned<T>)
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VERIFY(value >= 0);
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return static_cast<size_t>(value);
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});
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}
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// FIXME: Getters and setters.
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void const* value;
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Type type;
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ErrorOr<void> (*formatter)(TypeErasedFormatParams&, FormatBuilder&, FormatParser&, void const* value);
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};
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class FormatBuilder {
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public:
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enum class Align {
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Default,
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Left,
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Center,
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Right,
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};
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enum class SignMode {
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OnlyIfNeeded,
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Always,
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Reserved,
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Default = OnlyIfNeeded,
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};
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enum class RealNumberDisplayMode {
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FixedPoint,
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General,
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Default = General,
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};
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explicit FormatBuilder(StringBuilder& builder)
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: m_builder(builder)
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{
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}
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ErrorOr<void> put_padding(char fill, size_t amount);
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ErrorOr<void> put_literal(StringView value);
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ErrorOr<void> put_string(
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StringView value,
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Align align = Align::Left,
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size_t min_width = 0,
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size_t max_width = NumericLimits<size_t>::max(),
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char fill = ' ');
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ErrorOr<void> put_u64(
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u64 value,
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u8 base = 10,
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bool prefix = false,
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bool upper_case = false,
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bool zero_pad = false,
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bool use_separator = false,
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Align align = Align::Right,
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size_t min_width = 0,
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char fill = ' ',
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SignMode sign_mode = SignMode::OnlyIfNeeded,
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bool is_negative = false);
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ErrorOr<void> put_i64(
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i64 value,
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u8 base = 10,
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bool prefix = false,
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bool upper_case = false,
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bool zero_pad = false,
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bool use_separator = false,
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Align align = Align::Right,
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size_t min_width = 0,
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char fill = ' ',
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SignMode sign_mode = SignMode::OnlyIfNeeded);
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ErrorOr<void> put_fixed_point(
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bool is_negative,
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i64 integer_value,
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u64 fraction_value,
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u64 fraction_one,
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u8 base = 10,
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bool upper_case = false,
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bool zero_pad = false,
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bool use_separator = false,
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Align align = Align::Right,
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size_t min_width = 0,
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size_t precision = 6,
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char fill = ' ',
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SignMode sign_mode = SignMode::OnlyIfNeeded,
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RealNumberDisplayMode = RealNumberDisplayMode::Default);
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#ifndef KERNEL
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ErrorOr<void> put_f80(
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long double value,
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u8 base = 10,
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bool upper_case = false,
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bool use_separator = false,
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Align align = Align::Right,
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size_t min_width = 0,
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size_t precision = 6,
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char fill = ' ',
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SignMode sign_mode = SignMode::OnlyIfNeeded,
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RealNumberDisplayMode = RealNumberDisplayMode::Default);
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ErrorOr<void> put_f64(
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double value,
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u8 base = 10,
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bool upper_case = false,
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bool zero_pad = false,
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bool use_separator = false,
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Align align = Align::Right,
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size_t min_width = 0,
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size_t precision = 6,
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char fill = ' ',
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SignMode sign_mode = SignMode::OnlyIfNeeded,
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RealNumberDisplayMode = RealNumberDisplayMode::Default);
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#endif
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ErrorOr<void> put_hexdump(
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ReadonlyBytes,
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size_t width,
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char fill = ' ');
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StringBuilder const& builder() const
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{
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return m_builder;
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}
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StringBuilder& builder() { return m_builder; }
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private:
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StringBuilder& m_builder;
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};
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class TypeErasedFormatParams {
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public:
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ReadonlySpan<TypeErasedParameter> parameters() const { return m_parameters; }
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void set_parameters(ReadonlySpan<TypeErasedParameter> parameters) { m_parameters = parameters; }
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size_t take_next_index() { return m_next_index++; }
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private:
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ReadonlySpan<TypeErasedParameter> m_parameters;
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size_t m_next_index { 0 };
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};
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template<typename T>
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ErrorOr<void> __format_value(TypeErasedFormatParams& params, FormatBuilder& builder, FormatParser& parser, void const* value)
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{
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Formatter<T> formatter;
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formatter.parse(params, parser);
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return formatter.format(builder, *static_cast<T const*>(value));
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}
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template<AllowDebugOnlyFormatters allow_debug_formatters, typename... Parameters>
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class VariadicFormatParams : public TypeErasedFormatParams {
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public:
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static_assert(sizeof...(Parameters) <= max_format_arguments);
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explicit VariadicFormatParams(Parameters const&... parameters)
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: m_data({ TypeErasedParameter { ¶meters, TypeErasedParameter::get_type<Parameters>(), __format_value<Parameters> }... })
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{
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constexpr bool any_debug_formatters = (is_debug_only_formatter<Formatter<Parameters>>() || ...);
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static_assert(!any_debug_formatters || allow_debug_formatters == AllowDebugOnlyFormatters::Yes,
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"You are attempting to use a debug-only formatter outside of a debug log! Maybe one of your format values is an ErrorOr<T>?");
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this->set_parameters(m_data);
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}
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private:
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Array<TypeErasedParameter, sizeof...(Parameters)> m_data;
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};
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// We use the same format for most types for consistency. This is taken directly from
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// std::format. One difference is that we are not counting the width or sign towards the
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// total width when calculating zero padding for numbers.
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// https://en.cppreference.com/w/cpp/utility/format/formatter#Standard_format_specification
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struct StandardFormatter {
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enum class Mode {
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Default,
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Binary,
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BinaryUppercase,
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Decimal,
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Octal,
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Hexadecimal,
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HexadecimalUppercase,
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Character,
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String,
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Pointer,
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FixedPoint,
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Hexfloat,
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HexfloatUppercase,
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HexDump,
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};
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FormatBuilder::Align m_align = FormatBuilder::Align::Default;
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FormatBuilder::SignMode m_sign_mode = FormatBuilder::SignMode::OnlyIfNeeded;
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Mode m_mode = Mode::Default;
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bool m_alternative_form = false;
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bool m_use_separator = false;
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char m_fill = ' ';
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bool m_zero_pad = false;
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Optional<size_t> m_width;
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Optional<size_t> m_precision;
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void parse(TypeErasedFormatParams&, FormatParser&);
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};
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template<Integral T>
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struct Formatter<T> : StandardFormatter {
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Formatter() = default;
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explicit Formatter(StandardFormatter formatter)
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: StandardFormatter(move(formatter))
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{
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}
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ErrorOr<void> format(FormatBuilder&, T);
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};
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template<>
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struct Formatter<StringView> : StandardFormatter {
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Formatter() = default;
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explicit Formatter(StandardFormatter formatter)
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: StandardFormatter(move(formatter))
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{
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}
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ErrorOr<void> format(FormatBuilder&, StringView);
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};
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template<typename T>
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requires(HasFormatter<T>)
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struct Formatter<ReadonlySpan<T>> : StandardFormatter {
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Formatter() = default;
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explicit Formatter(StandardFormatter formatter)
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: StandardFormatter(move(formatter))
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{
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}
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ErrorOr<void> format(FormatBuilder& builder, ReadonlySpan<T> value)
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{
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if (m_mode == Mode::Pointer) {
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Formatter<FlatPtr> formatter { *this };
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TRY(formatter.format(builder, reinterpret_cast<FlatPtr>(value.data())));
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return {};
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}
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if (m_sign_mode != FormatBuilder::SignMode::Default)
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VERIFY_NOT_REACHED();
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if (m_alternative_form)
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VERIFY_NOT_REACHED();
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if (m_zero_pad)
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VERIFY_NOT_REACHED();
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if (m_mode != Mode::Default)
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VERIFY_NOT_REACHED();
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if (m_width.has_value() && m_precision.has_value())
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VERIFY_NOT_REACHED();
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m_width = m_width.value_or(0);
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m_precision = m_precision.value_or(NumericLimits<size_t>::max());
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Formatter<T> content_fmt;
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TRY(builder.put_literal("[ "sv));
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bool first = true;
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for (auto& content : value) {
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if (!first) {
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TRY(builder.put_literal(", "sv));
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content_fmt = Formatter<T> {};
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}
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first = false;
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TRY(content_fmt.format(builder, content));
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}
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TRY(builder.put_literal(" ]"sv));
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return {};
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}
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};
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template<typename T>
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requires(HasFormatter<T>)
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struct Formatter<Span<T>> : Formatter<ReadonlySpan<T>> {
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ErrorOr<void> format(FormatBuilder& builder, Span<T> value)
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{
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return Formatter<ReadonlySpan<T>>::format(builder, value);
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}
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};
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template<typename T, size_t inline_capacity>
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requires(HasFormatter<T>)
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struct Formatter<Vector<T, inline_capacity>> : Formatter<ReadonlySpan<T>> {
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ErrorOr<void> format(FormatBuilder& builder, Vector<T, inline_capacity> const& value)
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{
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return Formatter<ReadonlySpan<T>>::format(builder, value.span());
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}
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};
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template<>
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struct Formatter<ReadonlyBytes> : Formatter<StringView> {
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ErrorOr<void> format(FormatBuilder& builder, ReadonlyBytes value)
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{
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if (m_mode == Mode::Pointer) {
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Formatter<FlatPtr> formatter { *this };
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return formatter.format(builder, reinterpret_cast<FlatPtr>(value.data()));
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}
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if (m_mode == Mode::Default || m_mode == Mode::HexDump) {
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m_mode = Mode::HexDump;
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return Formatter<StringView>::format(builder, value);
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}
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return Formatter<StringView>::format(builder, value);
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}
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};
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template<>
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struct Formatter<Bytes> : Formatter<ReadonlyBytes> {
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};
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// FIXME: Printing raw char pointers is inherently dangerous. Remove this and
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// its users and prefer StringView over it.
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template<>
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struct Formatter<char const*> : Formatter<StringView> {
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ErrorOr<void> format(FormatBuilder& builder, char const* value)
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{
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if (m_mode == Mode::Pointer) {
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Formatter<FlatPtr> formatter { *this };
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return formatter.format(builder, reinterpret_cast<FlatPtr>(value));
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}
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return Formatter<StringView>::format(builder, value != nullptr ? StringView { value, __builtin_strlen(value) } : "(null)"sv);
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}
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};
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template<>
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struct Formatter<char*> : Formatter<char const*> {
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};
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template<size_t Size>
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struct Formatter<char[Size]> : Formatter<char const*> {
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};
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template<size_t Size>
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struct Formatter<unsigned char[Size]> : Formatter<StringView> {
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ErrorOr<void> format(FormatBuilder& builder, unsigned char const* value)
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{
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if (m_mode == Mode::Pointer) {
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Formatter<FlatPtr> formatter { *this };
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return formatter.format(builder, reinterpret_cast<FlatPtr>(value));
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}
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return Formatter<StringView>::format(builder, { value, Size });
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}
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};
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template<>
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struct Formatter<DeprecatedString> : Formatter<StringView> {
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};
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template<>
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struct Formatter<DeprecatedFlyString> : Formatter<StringView> {
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};
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template<typename T>
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struct Formatter<T*> : StandardFormatter {
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ErrorOr<void> format(FormatBuilder& builder, T* value)
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{
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if (m_mode == Mode::Default)
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m_mode = Mode::Pointer;
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Formatter<FlatPtr> formatter { *this };
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return formatter.format(builder, reinterpret_cast<FlatPtr>(value));
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}
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};
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template<>
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struct Formatter<char> : StandardFormatter {
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ErrorOr<void> format(FormatBuilder&, char);
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};
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template<>
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struct Formatter<wchar_t> : StandardFormatter {
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ErrorOr<void> format(FormatBuilder& builder, wchar_t);
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};
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template<>
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struct Formatter<bool> : StandardFormatter {
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ErrorOr<void> format(FormatBuilder&, bool);
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};
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#ifndef KERNEL
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template<>
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struct Formatter<float> : StandardFormatter {
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ErrorOr<void> format(FormatBuilder&, float value);
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};
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template<>
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struct Formatter<double> : StandardFormatter {
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Formatter() = default;
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explicit Formatter(StandardFormatter formatter)
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: StandardFormatter(formatter)
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{
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}
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ErrorOr<void> format(FormatBuilder&, double);
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};
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template<>
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struct Formatter<long double> : StandardFormatter {
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Formatter() = default;
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explicit Formatter(StandardFormatter formatter)
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: StandardFormatter(formatter)
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{
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}
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ErrorOr<void> format(FormatBuilder&, long double value);
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};
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#endif
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template<>
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struct Formatter<nullptr_t> : Formatter<FlatPtr> {
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ErrorOr<void> format(FormatBuilder& builder, nullptr_t)
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{
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if (m_mode == Mode::Default)
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m_mode = Mode::Pointer;
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return Formatter<FlatPtr>::format(builder, 0);
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}
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};
|
|
|
|
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)
|
|
return Formatter<FormatString>::format(builder, "Error(errno={})"sv, error.code());
|
|
#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
|