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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.
*/
#include "fud_string_convert.hpp"
namespace fud::impl {
FudStatus checkPlusSigned(StringView& view, size_t& skipIndex)
{
auto isPlusSigned = view.data()[0] == '+';
if (isPlusSigned && view.length() == 1) {
return FudStatus::ArgumentInvalid;
}
if (isPlusSigned) {
view.advanceUnsafe();
skipIndex++;
}
return FudStatus::Success;
}
Result<bool, FudStatus> checkNegative(StringView& view, size_t& skipIndex)
{
bool isNegative = view.data()[0] == '-';
if (isNegative && view.length() == 1) {
return FudStatus::ArgumentInvalid;
}
if (isNegative) {
skipIndex += 1;
view.advanceUnsafe();
}
return isNegative;
}
Result<Radix, FudStatus> determineRadix(StringView input, size_t& index)
{
if (input.length() < 1) {
return FudStatus::ArgumentInvalid;
}
if (input.length() == 1 && input.data()[0] == '0') {
return Radix::Octal;
}
if (input.length() == 1) {
return Radix::Decimal;
}
if (input.data()[0] == '0' && (input.data()[1] == 'x' || input.data()[1] == 'X')) {
index += 2;
return Radix::Hexadecimal;
}
if (input.data()[0] == '0') {
auto nextChar = input.data()[1];
auto nextVal = AsciiLookup[nextChar];
if (nextVal >= 0 && nextVal < static_cast<uint8_t>(Radix::Octal)) {
return Radix::Octal;
}
if (nextVal >= static_cast<uint8_t>(Radix::Octal)) {
return FudStatus::ArgumentInvalid;
}
}
return Radix::Decimal;
}
Result<uint8_t, FudStatus> getRadix(StringView& view, size_t& skipIndex, Option<uint8_t> specifiedRadixOption)
{
if (specifiedRadixOption.isNone()) {
size_t radixIndex = 0;
auto status = determineRadix(view, radixIndex);
if (status.isOkay()) {
skipIndex += radixIndex;
view.advanceUnsafe(radixIndex);
return static_cast<uint8_t>(status.takeOkay());
}
return status.takeError();
}
auto radix = specifiedRadixOption.value();
if (radix == static_cast<uint8_t>(Radix::Hexadecimal) && view.length() > 2 &&
(view.data()[1] == 'x' || view.data()[1] == 'X')) {
skipIndex += 2;
view.advanceUnsafe(2);
} else if (radix == static_cast<uint8_t>(Radix::Binary) && view.length() > 2 && view.data()[1] == 'b') {
skipIndex += 2;
view.advanceUnsafe(2);
} else if (radix == static_cast<uint8_t>(Radix::Octal) && view.length() > 2 && view.data()[1] == '0') {
skipIndex += 2;
view.advanceUnsafe(2);
}
return radix;
}
} // namespace fud::impl
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