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/*
* libfud
* Copyright 2024 Dominick Allen
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef FUD_FORMAT_HPP
#define FUD_FORMAT_HPP
// #include "fud_assert.hpp"
#include "fud_result.hpp"
#include "fud_status.hpp"
#include "fud_string_view.hpp"
#include "fud_utf8.hpp"
#include <cstdint>
#include <optional>
#include <variant>
namespace fud {
struct FormatAlign
{
enum class Value : uint8_t
{
Left,
Right,
Center
};
constexpr static std::optional<FormatAlign> from(utf8 letter)
{
FormatAlign formatAlign;
switch (letter) {
case '<':
formatAlign.value = Value::Left;
break;
case '>':
formatAlign.value = Value::Right;
break;
case '^':
formatAlign.value = Value::Center;
break;
default:
return std::nullopt;
}
return formatAlign;
}
Value value;
};
struct FormatFill {
FormatAlign align;
utf8 fill;
constexpr static Result<std::optional<FormatFill>, FudStatus> parse(StringView formatView) {
// "{:A<X}"
using RetType = Result<std::optional<FormatFill>, FudStatus>;
if (formatView.length() < 3) {
return RetType::okay(std::nullopt);
}
const auto* data = formatView.data();
if (data[0] != 'A') {
return RetType::okay(std::nullopt);
}
auto align = FormatAlign::from(data[1]);
if (!align.has_value()) {
return FudStatus::FormatInvalid;
}
auto fill = data[2];
if (!Ascii::valid(fill)) {
return FudStatus::Utf8Invalid;
}
return RetType::okay(FormatFill{*align, fill});
}
};
enum class FormatSign : uint8_t
{
Plus,
Minus,
Space
};
enum class FormatStringType : uint8_t
{
String,
Escaped,
};
enum class FormatIntegerType : uint8_t
{
BinaryLower,
BinaryUpper,
Character,
Decimal,
Octal,
HexLower,
HexUpper,
};
enum class FormatCharacterType : uint8_t
{
BinaryLower,
BinaryUpper,
Character,
Decimal,
Octal,
HexLower,
HexUpper,
};
enum class FormatBoolType : uint8_t
{
BinaryLower,
BinaryUpper,
Character,
Decimal,
Octal,
HexLower,
HexUpper,
};
enum class FormatFloatingType : uint8_t
{
FloatHexLower,
FloatHexUpper,
ScientificLower,
ScientificUpper,
Fixed,
GeneralLower,
GeneralUpper
};
enum class FormatPointerType : uint8_t
{
HexLower,
HexUpper
};
using FormatType = std::variant< // break
std::monostate,
FormatStringType,
FormatIntegerType,
FormatCharacterType,
FormatBoolType,
FormatFloatingType,
FormatPointerType>;
struct FormatSpec;
using FormatSpecResult = Result<FormatSpec, FudStatus>;
struct FormatSpec {
size_t width;
size_t precision;
FormatFill fill;
FormatSign formatSign;
FormatType formatType;
bool hasWidth;
bool takesWidth;
bool hasPrecision;
bool takesPrecision;
bool hasFill;
bool hasFormatSign;
bool alternateForm;
bool leadingZero;
static Result<FormatSpec, FudStatus> make(StringView& formatView, size_t specIndex);
};
} // namespace fud
#endif
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