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b7a4c4482f
With this commit, <AK/Format.h> has a more supportive role and isn't
used directly.
Essentially, there now is a public 'vformat' function ('v' for vector)
which takes already type erased parameters. The name is choosen to
indicate that this function behaves similar to C-style functions taking
a va_list equivalent.
The interface for frontend users are now 'String::formatted' and
'StringBuilder::appendff'.
96 lines
3.1 KiB
C++
96 lines
3.1 KiB
C++
/*
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* Copyright (c) 2020, the SerenityOS developers.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/Array.h>
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#include <AK/StringView.h>
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// FIXME: I would really love to merge the format_value and make_type_erased_parameters functions,
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// but the compiler creates weird error messages when I do that. Here is a small snippet that
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// reproduces the issue: https://godbolt.org/z/o55crs
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namespace AK {
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template<typename T, typename = void>
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struct Formatter;
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} // namespace AK
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namespace AK::Detail::Format {
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template<typename T>
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bool format_value(StringBuilder& builder, const void* value, StringView flags)
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{
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Formatter<T> formatter;
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if (!formatter.parse(flags))
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return false;
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formatter.format(builder, *static_cast<const T*>(value));
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return true;
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}
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} // namespace AK::Detail::Format
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namespace AK {
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struct TypeErasedParameter {
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const void* value;
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bool (*formatter)(StringBuilder& builder, const void* value, StringView flags);
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};
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template<>
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struct Formatter<StringView> {
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bool parse(StringView flags);
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void format(StringBuilder& builder, StringView value);
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};
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template<size_t Size>
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struct Formatter<char[Size]> : Formatter<StringView> {
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};
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template<>
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struct Formatter<String> : Formatter<StringView> {
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};
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template<typename T>
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struct Formatter<T, typename EnableIf<IsIntegral<T>::value>::Type> {
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bool parse(StringView flags);
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void format(StringBuilder&, T value);
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bool zero_pad { false };
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bool hexadecimal { false };
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size_t field_width { 0 };
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};
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template<typename... Parameters>
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Array<TypeErasedParameter, sizeof...(Parameters)> make_type_erased_parameters(const Parameters&... parameters)
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{
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return { TypeErasedParameter { ¶meters, Detail::Format::format_value<Parameters> }... };
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}
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void vformat(StringBuilder& builder, StringView fmtstr, Span<const TypeErasedParameter>, size_t argument_index = 0);
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} // namespace AK
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