feat(strings): add a more general string formatting framework
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Redcraft.Utility/Source/Public/Strings/Formatting.h
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990
Redcraft.Utility/Source/Public/Strings/Formatting.h
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#pragma once
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#include "CoreTypes.h"
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#include "TypeTraits/TypeTraits.h"
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#include "Templates/Utility.h"
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#include "Ranges/Utility.h"
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#include "Ranges/View.h"
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#include "Algorithms/Basic.h"
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#include "Containers/StaticArray.h"
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#include "Numerics/Math.h"
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#include "Strings/Char.h"
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#include "Miscellaneous/AssertionMacros.h"
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NAMESPACE_REDCRAFT_BEGIN
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NAMESPACE_MODULE_BEGIN(Redcraft)
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NAMESPACE_MODULE_BEGIN(Utility)
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/** A concept specifies a type is a format description string context. */
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template <typename T, typename CharType = char>
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concept CFormatStringContext = CInputRange<T> && CCharType<CharType> && CSameAs<TRangeElement<T>, CharType>
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&& requires(T& Context, TRangeIterator<T> Iter, size_t Index)
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{
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/** Set the iterator of the context. */
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Context.AdvanceTo(MoveTemp(Iter));
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/** @return The next automatic index. */
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{ Context.GetNextIndex() } -> CSameAs<size_t>;
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/** @return true if the manual index is valid. */
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{ Context.CheckIndex(Index) } -> CBooleanTestable;
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};
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/** A concept specifies a type is a format output context. */
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template <typename T, typename CharType = char>
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concept CFormatObjectContext = COutputRange<T, CharType> && CCharType<CharType>
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&& requires(T& Context, TRangeIterator<T> Iter, size_t Index)
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{
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/** Set the iterator of the context. */
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Context.AdvanceTo(MoveTemp(Iter));
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/** Visit the format argument by index, and the argument is always like const&. */
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{ Context.Visit([](const auto&) { return 0; }, Index) } -> CIntegral;
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/** Visit the format argument by index, and the argument is always like const&. */
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{ Context.template Visit<int>([](const auto&) { return 0; }, Index) } -> CIntegral;
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};
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/**
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* A template class that defines the formatting rules for a specific type.
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*
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* @tparam T - The type of object being formatted.
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* @tparam CharType - The character type of the formatting target.
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*/
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template <typename T, CCharType CharType = char> requires (CSameAs<TRemoveCVRef<T>, T>)
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class TFormatter
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{
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public:
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static_assert(sizeof(T) == -1, "The type is not formattable.");
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FORCEINLINE constexpr TFormatter() = delete;
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FORCEINLINE constexpr TFormatter(const TFormatter&) = delete;
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FORCEINLINE constexpr TFormatter(TFormatter&&) = delete;
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FORCEINLINE constexpr TFormatter& operator=(const TFormatter&) = delete;
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FORCEINLINE constexpr TFormatter& operator=(TFormatter&&) = delete;
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/**
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* Parses the format description string from the context.
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* Assert that the format description string is valid.
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*
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* @return The iterator that points to the first unmatched character.
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*/
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template <CFormatStringContext<CharType> CTX>
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FORCEINLINE constexpr TRangeIterator<CTX> Parse(CTX& Context);
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/**
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* Formats the object and writes the result to the context.
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* Do not assert that the output range is always large enough, and return directly if it is insufficient.
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* Specify, unlike visiting arguments from the context which is always like const&,
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* the object argument is a forwarding reference.
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*
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* @return The iterator that points to the next position of the output.
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*/
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template <typename U, CFormatObjectContext<CharType> CTX> requires (CSameAs<TRemoveCVRef<T>, U>)
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FORCEINLINE constexpr TRangeIterator<CTX> Format(U&& Object, CTX& Context) const;
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};
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NAMESPACE_PRIVATE_BEGIN
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template <typename I, typename S, typename... Ts>
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class TFormatStringContext
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{
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public:
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FORCEINLINE constexpr TFormatStringContext(I InFirst, S InLast) : First(MoveTemp(InFirst)), Last(InLast), AutomaticIndex(0) { }
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NODISCARD FORCEINLINE constexpr I Begin() requires (!CCopyable<I>) { return MoveTemp(First); }
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NODISCARD FORCEINLINE constexpr I Begin() const requires ( CCopyable<I>) { return First; }
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NODISCARD FORCEINLINE constexpr S End() const { return Last; }
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NODISCARD FORCEINLINE constexpr size_t Num() const requires (CSizedSentinelFor<S, I>) { return Last - First; }
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NODISCARD FORCEINLINE constexpr bool IsEmpty() const { return First == Last; }
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FORCEINLINE constexpr void AdvanceTo(I Iter) { First = MoveTemp(Iter); }
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NODISCARD FORCEINLINE constexpr size_t GetNextIndex()
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{
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bool bIsValid = AutomaticIndex < sizeof...(Ts) && AutomaticIndex != INDEX_NONE;
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checkf(bIsValid, TEXT("Illegal automatic indexing. Already entered manual indexing mode."));
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if (!bIsValid) return INDEX_NONE;
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return AutomaticIndex++;
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}
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NODISCARD FORCEINLINE constexpr bool CheckIndex(size_t Index)
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{
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bool bIsValid = AutomaticIndex == 0 || AutomaticIndex == INDEX_NONE;
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checkf(bIsValid, TEXT("Illegal manual indexing. Already entered automatic indexing mode."));
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if (!bIsValid) return false;
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AutomaticIndex = INDEX_NONE;
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return Index < sizeof...(Ts);
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}
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private:
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NO_UNIQUE_ADDRESS I First;
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NO_UNIQUE_ADDRESS S Last;
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size_t AutomaticIndex = 0;
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};
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static_assert(CFormatStringContext<TFormatStringContext<IInputIterator<char>, ISentinelFor<IInputIterator<char>>>>);
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template <typename I, typename S, typename... Ts>
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class TFormatObjectContext
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{
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public:
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FORCEINLINE constexpr TFormatObjectContext(I InFirst, S InLast, Ts&... Args) : First(MoveTemp(InFirst)), Last(InLast), ArgsTuple(Args...) { }
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NODISCARD FORCEINLINE constexpr I Begin() requires (!CCopyable<I>) { return MoveTemp(First); }
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NODISCARD FORCEINLINE constexpr I Begin() const requires ( CCopyable<I>) { return First; }
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NODISCARD FORCEINLINE constexpr S End() const { return Last; }
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NODISCARD FORCEINLINE constexpr size_t Num() const requires (CSizedSentinelFor<S, I>) { return Last - First; }
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NODISCARD FORCEINLINE constexpr bool IsEmpty() const { return First == Last; }
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FORCEINLINE constexpr void AdvanceTo(I Iter) { First = MoveTemp(Iter); }
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template <typename F> requires (((sizeof...(Ts) >= 1) && ... && CInvocable<F&&, Ts&>) && CCommonReference<TInvokeResult<F&&, const Ts&>...>)
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FORCEINLINE constexpr decltype(auto) Visit(F&& Func, size_t Index) const { return ArgsTuple.Visit(Forward<F>(Func), Index); }
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template <typename Ret, typename F> requires ((sizeof...(Ts) >= 1) && ... && CInvocableResult<Ret, F&&, const Ts&>)
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FORCEINLINE constexpr Ret Visit(F&& Func, size_t Index) const { return ArgsTuple.template Visit<Ret>(Forward<F>(Func), Index); }
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private:
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NO_UNIQUE_ADDRESS I First;
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NO_UNIQUE_ADDRESS S Last;
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TTuple<Ts&...> ArgsTuple;
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};
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static_assert(CFormatObjectContext<TFormatObjectContext<IOutputIterator<char&>, ISentinelFor<IOutputIterator<char&>>, int>>);
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NAMESPACE_PRIVATE_END
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/** A concept specifies a type is formattable by the 'Algorithms::Format()'. */
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template <typename T, typename CharType = char>
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concept CFormattable = CCharType<CharType> && CSemiregular<TFormatter<TRemoveCVRef<T>, CharType>>
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&& requires(TFormatter<TRemoveCVRef<T>, CharType>& Formatter, T& Object,
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NAMESPACE_PRIVATE::TFormatStringContext< IInputIterator<CharType >, ISentinelFor< IInputIterator<CharType >>, T> FormatStringContext,
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NAMESPACE_PRIVATE::TFormatObjectContext<IOutputIterator<CharType&>, ISentinelFor<IOutputIterator<CharType&>>, T> FormatObjectContext)
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{
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{ Formatter.Parse ( FormatStringContext) } -> CSameAs< IInputIterator<CharType >>;
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{ Formatter.Format(Object, FormatObjectContext) } -> CSameAs<IOutputIterator<CharType&>>;
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};
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NAMESPACE_BEGIN(Algorithms)
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/**
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* Formats the objects and writes the result to the output range.
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* Assert that the format description string is valid.
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* If the output range is insufficient, return directly without asserting.
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*
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* @param Output - The output range to write the result.
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* @param Fmt - The format description string.
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* @param Args - The objects to format.
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*
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* @return The iterator that points to the next position of the output.
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*/
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template <CInputRange R1, COutputRange<TRangeElement<R1>> R2, CFormattable<TRangeElement<R1>>... Ts> requires (CBorrowedRange<R2>)
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FORCEINLINE constexpr TRangeIterator<R2> Format(R2&& Output, R1&& Fmt, Ts&&... Args)
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{
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if constexpr (CSizedRange<R1&>)
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{
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checkf(Algorithms::Distance(Fmt) >= 0, TEXT("Illegal range. Please check Algorithms::Distance(Fmt)."));
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}
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if constexpr (CSizedRange<R2&>)
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{
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checkf(Algorithms::Distance(Output) >= 0, TEXT("Illegal range. Please check Algorithms::Distance(Output)."));
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}
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using FCharType = TRangeElement<R1>;
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using FCharTraits = TChar<FCharType>;
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using FFormatStringContext = NAMESPACE_PRIVATE::TFormatStringContext<TRangeIterator<R1>, TRangeSentinel<R1>, Ts...>;
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using FFormatObjectContext = NAMESPACE_PRIVATE::TFormatObjectContext<TRangeIterator<R2>, TRangeSentinel<R2>, Ts...>;
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FFormatStringContext FormatStringContext(Ranges::Begin(Fmt ), Ranges::End(Fmt ));
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FFormatObjectContext FormatObjectContext(Ranges::Begin(Output), Ranges::End(Output), Args...);
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auto FmtIter = Ranges::Begin(FormatStringContext);
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auto FmtSent = Ranges::End (FormatStringContext);
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auto OutIter = Ranges::Begin(FormatObjectContext);
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auto OutSent = Ranges::End (FormatObjectContext);
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// If the output range is insufficient.
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if (OutIter == OutSent) UNLIKELY return OutIter;
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TTuple<TFormatter<TRemoveCVRef<Ts>, FCharType>...> Formatters;
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// For each character in the format string.
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for (FCharType Char; FmtIter != FmtSent; ++FmtIter)
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{
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Char = *FmtIter;
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// If the character may be a replacement field.
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if (Char == LITERAL(FCharType, '{'))
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{
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if (++FmtIter == FmtSent) UNLIKELY
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{
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checkf(false, TEXT("Illegal format string. Unmatched '{' in format string."));
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break;
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}
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Char = *FmtIter;
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// If the character just an escaped '{'.
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if (Char == LITERAL(FCharType, '{'))
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{
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if (OutIter == OutSent) UNLIKELY return OutIter;
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*OutIter++ = LITERAL(FCharType, '{');
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continue;
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}
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// If available replacement fields.
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if constexpr (sizeof...(Ts) >= 1)
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{
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size_t Index;
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// If the replacement field has a manual index.
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if (Char != LITERAL(FCharType, ':') && Char != LITERAL(FCharType, '}'))
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{
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Index = 0;
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bool bIsValid = true;
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do
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{
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const uint Digit = FCharTraits::ToDigit(Char);
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if (Digit > 10) bIsValid = false;
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Index = Index * 10 + Digit;
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if (++FmtIter == FmtSent) UNLIKELY break;
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Char = *FmtIter;
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}
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while (Char != LITERAL(FCharType, ':') && Char != LITERAL(FCharType, '}'));
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// If the index string contains illegal characters or the index is out of range.
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if (!bIsValid || !FormatStringContext.CheckIndex(Index)) UNLIKELY
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{
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checkf(false, TEXT("Illegal index. Please check the replacement field."));
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break;
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}
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}
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// If the replacement field need automatic indexing.
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else
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{
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Index = FormatStringContext.GetNextIndex();
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if (Index == INDEX_NONE)
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{
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checkf(false, TEXT("Illegal index. Please check the replacement field."));
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break;
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}
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}
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// Jump over the ':' character.
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if (Char == LITERAL(FCharType, ':')) ++FmtIter;
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FormatStringContext.AdvanceTo(MoveTemp(FmtIter));
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// Parse the format description string.
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FmtIter = Formatters.Visit([&FormatStringContext](auto& Formatter) -> decltype(FmtIter) { return Formatter.Parse(FormatStringContext); }, Index);
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if (FmtIter == FmtSent || *FmtIter != LITERAL(FCharType, '}')) UNLIKELY
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{
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checkf(false, TEXT("Illegal format string. Missing '}' in format string."));
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break;
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}
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FormatObjectContext.AdvanceTo(MoveTemp(OutIter));
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auto FormatHandler = [&]<size_t... Indices>(TIndexSequence<Indices...>)
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{
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TTuple<TConstant<size_t, Indices>...> Visitor;
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return Visitor.Visit([&]<size_t ConstantIndex>(TConstant<size_t, ConstantIndex>)
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{
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check(ConstantIndex == Index);
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return Formatters.template GetValue<ConstantIndex>().Format(ForwardAsTuple(Forward<Ts>(Args)...).template GetValue<ConstantIndex>(), FormatObjectContext);
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}
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, Index);
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};
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// Format the object and write the result to the context.
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OutIter = FormatHandler(TIndexSequenceFor<Ts...>());
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}
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else
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{
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checkf(false, TEXT("Illegal index. Please check the replacement field."));
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break;
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}
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}
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// If the character just an escaped '}'.
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else if (Char == LITERAL(FCharType, '}'))
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{
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// Confirm the character is an escaped '}'.
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if (++FmtIter != FmtSent && *FmtIter == LITERAL(FCharType, '}'))
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{
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if (OutIter == OutSent) UNLIKELY return OutIter;
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*OutIter++ = LITERAL(FCharType, '}');
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continue;
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}
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checkf(false, TEXT("Illegal format string. Missing '{' in format string."));
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break;
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}
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// If the output range is insufficient.
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else if (OutIter == OutSent) UNLIKELY return OutIter;
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// If the character is not a replacement field.
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else *OutIter++ = Char;
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}
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return OutIter;
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}
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/**
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* Formats the objects and writes the result to the output range.
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* Assert that the format description string is valid.
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* If the output range is insufficient, return directly without asserting.
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*
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* @param OutputFirst - The iterator of the output range to write the result.
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* @param OutputLast - The sentinel of the output range to write the result.
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* @param FmtFirst - The iterator of the format description string.
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* @param FmtLast - The sentinel of the format description string.
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* @param Args - The objects to format.
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*
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* @return The iterator that points to the next position of the output.
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*/
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template <CInputIterator I1, CSentinelFor<I1> S1, COutputIterator<TIteratorElement<I1>> I2, CSentinelFor<I2> S2, CFormattable<TIteratorElement<I1>>... Ts>
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FORCEINLINE constexpr I2 Format(I2 OutputFirst, S2 OutputLast, I1 FmtFirst, S1 FmtLast, Ts&&... Args)
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{
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if constexpr (CSizedSentinelFor<S1, I1>)
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{
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checkf(FmtFirst - FmtLast <= 0, TEXT("Illegal range iterator. Please check HaystackFirst <= HaystackLast."));
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}
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if constexpr (CSizedSentinelFor<S2, I2>)
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{
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checkf(OutputFirst - OutputLast <= 0, TEXT("Illegal range iterator. Please check NeedleFirst <= NeedleLast."));
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}
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return Algorithms::Format(Ranges::View(MoveTemp(OutputFirst), OutputLast), Ranges::View(MoveTemp(FmtFirst), FmtLast), Forward<Ts>(Args)...);
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}
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NAMESPACE_END(Algorithms)
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/**
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* A formatter the null-terminated string.
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*
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* The syntax of format specifications is:
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*
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* [Fill And Align] [Width] [Precision] [Type]
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*
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* 1. The fill and align part:
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*
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* [Fill Character] <Align Option>
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*
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* i. Fill Character: The character is used to fill width of the object. It is optional and cannot be '{' or '}'.
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* It should be representable as a single unicode otherwise it is undefined behavior.
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*
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* ii. Align Option: The character is used to indicate the direction of alignment.
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*
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* - '<': Align the formatted argument to the left of the available space
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* by inserting n fill characters after the formatted argument.
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* - '^': Align the formatted argument to the center of the available space
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* by inserting n fill characters around the formatted argument.
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* If cannot absolute centering, offset to the left.
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* - '>': Align the formatted argument ro the right of the available space
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* by inserting n fill characters before the formatted argument.
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*
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* 2. The width part:
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*
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* - 'N': The number is used to specify the minimum field width of the object.
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* N should be an unsigned non-zero decimal number.
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* - '{N}': Dynamically determine the minimum field width of the object.
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* N should be a valid index of the format integer argument.
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* N is optional, and the default value is automatic indexing.
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*
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* 3. The precision part:
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*
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* - '.N': The number is used to specify the maximum field width of the object.
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* N should be an unsigned non-zero decimal number.
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* - '.{N}': Dynamically determine the maximum field width of the object.
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* N should be a valid index of the format integer argument.
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* N is optional, and the default value is automatic indexing.
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*
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* 4. The type indicators part:
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*
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* - none: Indicates the as-is formatting.
|
||||
* - 'S': Indicates the as-is formatting.
|
||||
* - '!': Indicates uppercase formatting.
|
||||
* - 's': Indicates lowercase formatting.
|
||||
* - '?': Indicates escape formatting.
|
||||
*/
|
||||
template <CCharType T>
|
||||
class TFormatter<T*, T>
|
||||
{
|
||||
private:
|
||||
|
||||
using FCharType = T;
|
||||
using FCharTraits = TChar<FCharType>;
|
||||
using FFillCharacter = TStaticArray<FCharType, FCharTraits::MaxCodeUnitLength>;
|
||||
|
||||
public:
|
||||
|
||||
template <CFormatStringContext<FCharType> CTX>
|
||||
constexpr TRangeIterator<CTX> Parse(CTX& Context)
|
||||
{
|
||||
auto Iter = Ranges::Begin(Context);
|
||||
auto Sent = Ranges::End (Context);
|
||||
|
||||
// Set the default values.
|
||||
{
|
||||
FillUnitLength = 1;
|
||||
FillCharacter[0] = LITERAL(FCharType, ' ');
|
||||
AlignOption = LITERAL(FCharType, '<');
|
||||
|
||||
MinFieldWidth = 0;
|
||||
MaxFieldWidth = -1;
|
||||
|
||||
bDynamicMin = false;
|
||||
bDynamicMax = false;
|
||||
|
||||
bLowercase = false;
|
||||
bUppercase = false;
|
||||
bEscape = false;
|
||||
}
|
||||
|
||||
// If the format description string is empty.
|
||||
if (Iter == Sent || *Iter == LITERAL(FCharType, '}')) return Iter;
|
||||
|
||||
FCharType Char = *Iter; ++Iter;
|
||||
|
||||
// Try to parse the fill and align part.
|
||||
// This code assumes that the format string does not contain multi-unit characters, except for fill character.
|
||||
|
||||
// If the fill character is multi-unit.
|
||||
if (!FCharTraits::IsValid(Char))
|
||||
{
|
||||
FillUnitLength = 1;
|
||||
FillCharacter[0] = Char;
|
||||
|
||||
while (true)
|
||||
{
|
||||
if (Iter == Sent) UNLIKELY
|
||||
{
|
||||
checkf(false, TEXT("Illegal format string. Missing '}' in format string."));
|
||||
|
||||
return Iter;
|
||||
}
|
||||
|
||||
Char = *Iter; ++Iter;
|
||||
|
||||
// If the fill character ends.
|
||||
if (FillUnitLength == FCharTraits::MaxCodeUnitLength || FCharTraits::IsValid(Char)) break;
|
||||
|
||||
FillCharacter[FillUnitLength++] = Char;
|
||||
}
|
||||
|
||||
if (Char != LITERAL(FCharType, '<') && Char != LITERAL(FCharType, '^') && Char != LITERAL(FCharType, '>')) UNLIKELY
|
||||
{
|
||||
checkf(false, TEXT("Illegal format string. The fill character is not representable as a single unicode."));
|
||||
|
||||
return Iter;
|
||||
}
|
||||
|
||||
AlignOption = Char;
|
||||
|
||||
if (Iter == Sent || *Iter == LITERAL(FCharType, '}')) return Iter;
|
||||
|
||||
Char = *Iter; ++Iter;
|
||||
}
|
||||
|
||||
// If the fill character is single-unit.
|
||||
else do
|
||||
{
|
||||
if (Iter == Sent) break;
|
||||
|
||||
if (*Iter != LITERAL(FCharType, '<') && *Iter != LITERAL(FCharType, '^') && *Iter != LITERAL(FCharType, '>')) break;
|
||||
|
||||
FillUnitLength = 1;
|
||||
FillCharacter[0] = Char;
|
||||
|
||||
Char = *Iter; ++Iter;
|
||||
|
||||
AlignOption = Char;
|
||||
|
||||
if (Iter == Sent || *Iter == LITERAL(FCharType, '}')) return Iter;
|
||||
|
||||
Char = *Iter; ++Iter;
|
||||
}
|
||||
while (false);
|
||||
|
||||
// Try to parse the width part.
|
||||
{
|
||||
if (Char == LITERAL(FCharType, '{'))
|
||||
{
|
||||
bDynamicMin = true;
|
||||
MinFieldWidth = INDEX_NONE;
|
||||
|
||||
if (Iter == Sent) UNLIKELY
|
||||
{
|
||||
checkf(false, TEXT("Illegal format string. Missing '}' in format string."));
|
||||
|
||||
return Iter;
|
||||
}
|
||||
|
||||
Char = *Iter; ++Iter;
|
||||
}
|
||||
|
||||
if ((bDynamicMin || Char != LITERAL(FCharType, '0')) && FCharTraits::IsDigit(Char))
|
||||
{
|
||||
MinFieldWidth = FCharTraits::ToDigit(Char);
|
||||
|
||||
while (true)
|
||||
{
|
||||
if (Iter == Sent)
|
||||
{
|
||||
checkf(!bDynamicMin, TEXT("Illegal format string. Missing '}' in format string."));
|
||||
|
||||
return Iter;
|
||||
}
|
||||
|
||||
if (!bDynamicMin && *Iter == LITERAL(FCharType, '}')) return Iter;
|
||||
|
||||
Char = *Iter; ++Iter;
|
||||
|
||||
const uint Digit = FCharTraits::ToDigit(Char);
|
||||
|
||||
if (Digit > 10) break;
|
||||
|
||||
MinFieldWidth = MinFieldWidth * 10 + Digit;
|
||||
}
|
||||
}
|
||||
|
||||
if (bDynamicMin)
|
||||
{
|
||||
if (Char != LITERAL(FCharType, '}')) UNLIKELY
|
||||
{
|
||||
checkf(false, TEXT("Illegal format string. Missing '}' in format string."));
|
||||
|
||||
return Iter;
|
||||
}
|
||||
|
||||
do
|
||||
{
|
||||
// Try to automatic indexing.
|
||||
if (MinFieldWidth == INDEX_NONE)
|
||||
{
|
||||
MinFieldWidth = Context.GetNextIndex();
|
||||
|
||||
if (MinFieldWidth == INDEX_NONE) UNLIKELY
|
||||
{
|
||||
checkf(false, TEXT("Illegal index. Please check the field width."));
|
||||
}
|
||||
else break;
|
||||
}
|
||||
|
||||
// Try to manual indexing.
|
||||
else if (!Context.CheckIndex(MinFieldWidth)) UNLIKELY
|
||||
{
|
||||
checkf(false, TEXT("Illegal index. Please check the field width."));
|
||||
}
|
||||
|
||||
else break;
|
||||
|
||||
bDynamicMin = false;
|
||||
MinFieldWidth = 0;
|
||||
}
|
||||
while (false);
|
||||
|
||||
if (Iter == Sent || *Iter == LITERAL(FCharType, '}')) return Iter;
|
||||
|
||||
Char = *Iter; ++Iter;
|
||||
}
|
||||
}
|
||||
|
||||
// Try to parse the precision part.
|
||||
if (Char == LITERAL(FCharType, '.'))
|
||||
{
|
||||
if (Iter == Sent) UNLIKELY
|
||||
{
|
||||
checkf(false, TEXT("Illegal format string. Missing precision in format string."));
|
||||
|
||||
return Iter;
|
||||
}
|
||||
|
||||
Char = *Iter; ++Iter;
|
||||
|
||||
if (Char == LITERAL(FCharType, '{'))
|
||||
{
|
||||
bDynamicMax = true;
|
||||
MaxFieldWidth = INDEX_NONE;
|
||||
|
||||
if (Iter == Sent) UNLIKELY
|
||||
{
|
||||
checkf(false, TEXT("Illegal format string. Missing '}' in format string."));
|
||||
|
||||
return Iter;
|
||||
}
|
||||
|
||||
Char = *Iter; ++Iter;
|
||||
}
|
||||
|
||||
if ((bDynamicMax || Char != LITERAL(FCharType, '0')) && FCharTraits::IsDigit(Char))
|
||||
{
|
||||
MaxFieldWidth = FCharTraits::ToDigit(Char);
|
||||
|
||||
while (true)
|
||||
{
|
||||
if (Iter == Sent)
|
||||
{
|
||||
checkf(!bDynamicMax, TEXT("Illegal format string. Missing '}' in format string."));
|
||||
|
||||
return Iter;
|
||||
}
|
||||
|
||||
if (!bDynamicMax && *Iter == LITERAL(FCharType, '}')) return Iter;
|
||||
|
||||
Char = *Iter; ++Iter;
|
||||
|
||||
const uint Digit = FCharTraits::ToDigit(Char);
|
||||
|
||||
if (Digit > 10) break;
|
||||
|
||||
MaxFieldWidth = MaxFieldWidth * 10 + Digit;
|
||||
}
|
||||
}
|
||||
|
||||
else if (!bDynamicMax)
|
||||
{
|
||||
checkf(false, TEXT("Illegal format string. Missing precision in format string."));
|
||||
|
||||
return Iter;
|
||||
}
|
||||
|
||||
if (bDynamicMax)
|
||||
{
|
||||
if (Char != LITERAL(FCharType, '}')) UNLIKELY
|
||||
{
|
||||
checkf(false, TEXT("Illegal format string. Missing '}' in format string."));
|
||||
|
||||
return Iter;
|
||||
}
|
||||
|
||||
do
|
||||
{
|
||||
// Try to automatic indexing.
|
||||
if (MaxFieldWidth == INDEX_NONE)
|
||||
{
|
||||
MaxFieldWidth = Context.GetNextIndex();
|
||||
|
||||
if (MaxFieldWidth == INDEX_NONE) UNLIKELY
|
||||
{
|
||||
checkf(false, TEXT("Illegal index. Please check the precision."));
|
||||
}
|
||||
else break;
|
||||
}
|
||||
|
||||
// Try to manual indexing.
|
||||
else if (!Context.CheckIndex(MaxFieldWidth)) UNLIKELY
|
||||
{
|
||||
checkf(false, TEXT("Illegal index. Please check the precision."));
|
||||
}
|
||||
|
||||
else break;
|
||||
|
||||
bDynamicMax = false;
|
||||
MaxFieldWidth = -1;
|
||||
}
|
||||
while (false);
|
||||
|
||||
if (Iter == Sent || *Iter == LITERAL(FCharType, '}')) return Iter;
|
||||
|
||||
Char = *Iter; ++Iter;
|
||||
}
|
||||
}
|
||||
|
||||
// Try to parse the type indicators part.
|
||||
if (Char == LITERAL(FCharType, 'S')) { if (Iter == Sent || *Iter == LITERAL(FCharType, '}')) return Iter; Char = *Iter; ++Iter; }
|
||||
else if (Char == LITERAL(FCharType, '!')) { bUppercase = true; if (Iter == Sent || *Iter == LITERAL(FCharType, '}')) return Iter; Char = *Iter; ++Iter; }
|
||||
else if (Char == LITERAL(FCharType, 's')) { bLowercase = true; if (Iter == Sent || *Iter == LITERAL(FCharType, '}')) return Iter; Char = *Iter; ++Iter; }
|
||||
else if (Char == LITERAL(FCharType, '?')) { bEscape = true; if (Iter == Sent || *Iter == LITERAL(FCharType, '}')) return Iter; Char = *Iter; ++Iter; }
|
||||
|
||||
checkf(false, TEXT("Illegal format string. Missing '}' in format string."));
|
||||
|
||||
return Iter;
|
||||
}
|
||||
|
||||
template <CFormatObjectContext<FCharType> CTX>
|
||||
constexpr TRangeIterator<CTX> Format(const FCharType* Object, CTX& Context) const
|
||||
{
|
||||
auto Iter = Ranges::Begin(Context);
|
||||
auto Sent = Ranges::End (Context);
|
||||
|
||||
size_t MinDynamicField = MinFieldWidth;
|
||||
size_t MaxDynamicField = MaxFieldWidth;
|
||||
|
||||
if (bDynamicMin) MinDynamicField = Context.Visit([]<typename U>(U&& Value) -> size_t
|
||||
{
|
||||
|
||||
if constexpr (CIntegral<U>)
|
||||
{
|
||||
checkf(Value > 0, TEXT("Illegal format argument. The dynamic width argument must be a unsigned non-zero number."));
|
||||
|
||||
return Math::Max(Value, 1);
|
||||
}
|
||||
else
|
||||
{
|
||||
checkf(false, TEXT("Illegal format argument. The dynamic width argument must be an integral."));
|
||||
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
, MinFieldWidth);
|
||||
|
||||
if (bDynamicMax) MaxDynamicField = Context.Visit([]<typename U>(U&& Value) -> size_t
|
||||
{
|
||||
if constexpr (CIntegral<U>)
|
||||
{
|
||||
checkf(Value > 0, TEXT("Illegal format argument. The dynamic precision argument must be a unsigned non-zero number."));
|
||||
|
||||
return Math::Max(Value, 1);
|
||||
}
|
||||
else
|
||||
{
|
||||
checkf(false, TEXT("Illegal format argument. The dynamic precision argument must be an integral."));
|
||||
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
, MaxFieldWidth);
|
||||
|
||||
size_t LeftPadding = 0;
|
||||
size_t RightPadding = 0;
|
||||
|
||||
// Estimate the field width.
|
||||
if (MinDynamicField != 0)
|
||||
{
|
||||
// If escape formatting is enabled, add quotes characters.
|
||||
size_t FieldWidth = bEscape ? 2 : 0;
|
||||
|
||||
for (const FCharType* Ptr = Object; *Ptr != LITERAL(FCharType, '\0'); ++Ptr)
|
||||
{
|
||||
if (bEscape)
|
||||
{
|
||||
switch (const FCharType Char = *Ptr)
|
||||
{
|
||||
case LITERAL(FCharType, '\"'): FieldWidth += 2; break;
|
||||
case LITERAL(FCharType, '\\'): FieldWidth += 2; break;
|
||||
case LITERAL(FCharType, '\a'): FieldWidth += 2; break;
|
||||
case LITERAL(FCharType, '\b'): FieldWidth += 2; break;
|
||||
case LITERAL(FCharType, '\f'): FieldWidth += 2; break;
|
||||
case LITERAL(FCharType, '\n'): FieldWidth += 2; break;
|
||||
case LITERAL(FCharType, '\r'): FieldWidth += 2; break;
|
||||
case LITERAL(FCharType, '\t'): FieldWidth += 2; break;
|
||||
case LITERAL(FCharType, '\v'): FieldWidth += 2; break;
|
||||
default:
|
||||
{
|
||||
// Use '\x00' format for other non-printable characters.
|
||||
if (!FCharTraits::IsASCII(Char) || !FCharTraits::IsPrint(Char))
|
||||
{
|
||||
FieldWidth += 2 + sizeof(FCharType) * 2;
|
||||
}
|
||||
|
||||
else ++FieldWidth;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
else ++FieldWidth;
|
||||
}
|
||||
|
||||
const size_t PaddingWidth = MinDynamicField - Math::Min(FieldWidth, MinDynamicField, MaxDynamicField);
|
||||
|
||||
if (AlignOption == LITERAL(FCharType, '<')) RightPadding = PaddingWidth;
|
||||
else if (AlignOption == LITERAL(FCharType, '>')) LeftPadding = PaddingWidth;
|
||||
else if (AlignOption == LITERAL(FCharType, '^'))
|
||||
{
|
||||
LeftPadding = Math::DivAndFloor(PaddingWidth, 2);
|
||||
RightPadding = PaddingWidth - LeftPadding;
|
||||
}
|
||||
}
|
||||
|
||||
// Write the left padding.
|
||||
for (size_t Index = 0; Index != LeftPadding; ++Index)
|
||||
{
|
||||
for (size_t Jndex = 0; Jndex != FillUnitLength; ++Jndex)
|
||||
{
|
||||
if (Iter == Sent) UNLIKELY return Iter;
|
||||
|
||||
*Iter++ = FillCharacter[Jndex];
|
||||
}
|
||||
}
|
||||
|
||||
// Write the left quote.
|
||||
if (bEscape)
|
||||
{
|
||||
if (Iter == Sent) UNLIKELY return Iter;
|
||||
|
||||
*Iter++ = LITERAL(FCharType, '\"');
|
||||
}
|
||||
|
||||
const FCharType* Ptr = Object - 1;
|
||||
|
||||
// Write the object, include escaped quotes in the counter.
|
||||
for (size_t Index = bEscape ? 1 : 0; Index != MaxDynamicField; ++Index)
|
||||
{
|
||||
FCharType Char = *++Ptr;
|
||||
|
||||
if (Char == LITERAL(FCharType, '\0')) break;
|
||||
|
||||
if (Iter == Sent) UNLIKELY return Iter;
|
||||
|
||||
// Convert the character case.
|
||||
if (bLowercase) Char = FCharTraits::ToLower(Char);
|
||||
else if (bUppercase) Char = FCharTraits::ToUpper(Char);
|
||||
|
||||
if (bEscape)
|
||||
{
|
||||
switch (Char)
|
||||
{
|
||||
case LITERAL(FCharType, '\"'): *Iter++ = LITERAL(FCharType, '\\'); *Iter++ = LITERAL(FCharType, '\"'); break;
|
||||
case LITERAL(FCharType, '\\'): *Iter++ = LITERAL(FCharType, '\\'); *Iter++ = LITERAL(FCharType, '\\'); break;
|
||||
case LITERAL(FCharType, '\a'): *Iter++ = LITERAL(FCharType, '\\'); *Iter++ = LITERAL(FCharType, 'a'); break;
|
||||
case LITERAL(FCharType, '\b'): *Iter++ = LITERAL(FCharType, '\\'); *Iter++ = LITERAL(FCharType, 'b'); break;
|
||||
case LITERAL(FCharType, '\f'): *Iter++ = LITERAL(FCharType, '\\'); *Iter++ = LITERAL(FCharType, 'f'); break;
|
||||
case LITERAL(FCharType, '\n'): *Iter++ = LITERAL(FCharType, '\\'); *Iter++ = LITERAL(FCharType, 'n'); break;
|
||||
case LITERAL(FCharType, '\r'): *Iter++ = LITERAL(FCharType, '\\'); *Iter++ = LITERAL(FCharType, 'r'); break;
|
||||
case LITERAL(FCharType, '\t'): *Iter++ = LITERAL(FCharType, '\\'); *Iter++ = LITERAL(FCharType, 't'); break;
|
||||
case LITERAL(FCharType, '\v'): *Iter++ = LITERAL(FCharType, '\\'); *Iter++ = LITERAL(FCharType, 'v'); break;
|
||||
default:
|
||||
{
|
||||
// Use '\x00' format for other non-printable characters.
|
||||
if (!FCharTraits::IsASCII(Char) || !FCharTraits::IsPrint(Char))
|
||||
{
|
||||
*Iter++ = LITERAL(FCharType, '\\');
|
||||
*Iter++ = LITERAL(FCharType, 'x' );
|
||||
|
||||
using FUnsignedT = TMakeUnsigned<FCharType>;
|
||||
|
||||
constexpr size_t DigitNum = sizeof(FCharType) * 2;
|
||||
|
||||
FUnsignedT IntValue = static_cast<FUnsignedT>(Char);
|
||||
|
||||
FCharType Buffer[DigitNum];
|
||||
|
||||
for (size_t Jndex = 0; Jndex != DigitNum; ++Jndex)
|
||||
{
|
||||
Buffer[DigitNum - Jndex - 1] = FCharTraits::FromDigit(IntValue & 0xF);
|
||||
|
||||
IntValue >>= 4;
|
||||
}
|
||||
|
||||
check(IntValue == 0);
|
||||
|
||||
for (size_t Jndex = 0; Jndex != DigitNum; ++Jndex)
|
||||
{
|
||||
if (Iter == Sent) UNLIKELY return Iter;
|
||||
|
||||
*Iter++ = Buffer[Jndex];
|
||||
}
|
||||
}
|
||||
|
||||
else *Iter++ = Char;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
else *Iter++ = Char;
|
||||
}
|
||||
|
||||
// Write the right quote, if the field width is enough.
|
||||
if (bEscape && *Ptr == LITERAL(FCharType, '\0'))
|
||||
{
|
||||
if (Iter == Sent) UNLIKELY return Iter;
|
||||
|
||||
*Iter++ = LITERAL(FCharType, '\"');
|
||||
}
|
||||
|
||||
// Write the right padding.
|
||||
for (size_t Index = 0; Index != RightPadding; ++Index)
|
||||
{
|
||||
for (size_t Jndex = 0; Jndex != FillUnitLength; ++Jndex)
|
||||
{
|
||||
if (Iter == Sent) UNLIKELY return Iter;
|
||||
|
||||
*Iter++ = FillCharacter[Jndex];
|
||||
}
|
||||
}
|
||||
|
||||
return Iter;
|
||||
}
|
||||
|
||||
private:
|
||||
|
||||
size_t FillUnitLength = 1;
|
||||
FFillCharacter FillCharacter = { LITERAL(FCharType, ' ') };
|
||||
FCharType AlignOption = LITERAL(FCharType, '<');
|
||||
|
||||
size_t MinFieldWidth = 0;
|
||||
size_t MaxFieldWidth = -1;
|
||||
|
||||
bool bDynamicMin = false;
|
||||
bool bDynamicMax = false;
|
||||
|
||||
bool bLowercase = false;
|
||||
bool bUppercase = false;
|
||||
bool bEscape = false;
|
||||
|
||||
};
|
||||
|
||||
template <CCharType T> class TFormatter<const T* , T> : public TFormatter<T*, T> { };
|
||||
template <CCharType T, size_t N> class TFormatter< T[N], T> : public TFormatter<T*, T> { };
|
||||
template <CCharType T, size_t N> class TFormatter<const T[N], T> : public TFormatter<T*, T> { };
|
||||
|
||||
static_assert(CFormattable< char*>);
|
||||
static_assert(CFormattable<const char*>);
|
||||
|
||||
static_assert(CFormattable< char[256]>);
|
||||
static_assert(CFormattable<const char[256]>);
|
||||
|
||||
NAMESPACE_MODULE_END(Utility)
|
||||
NAMESPACE_MODULE_END(Redcraft)
|
||||
NAMESPACE_REDCRAFT_END
|
||||
Loading…
Reference in New Issue
Block a user