66 lines
3 KiB
C++
66 lines
3 KiB
C++
// Copyright (c) Microsoft Corporation.
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// Licensed under the MIT license.
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#include "pch.h"
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#include "PaddingConverter.h"
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#include "PaddingConverter.g.cpp"
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using namespace winrt::Windows;
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using namespace winrt::Windows::UI::Xaml;
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using namespace winrt::Windows::UI::Text;
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namespace winrt::Microsoft::Terminal::Settings::Editor::implementation
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{
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Foundation::IInspectable PaddingConverter::Convert(Foundation::IInspectable const& value,
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Windows::UI::Xaml::Interop::TypeName const& /* targetType */,
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Foundation::IInspectable const& /* parameter */,
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hstring const& /* language */)
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{
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const auto& padding = winrt::unbox_value<hstring>(value);
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const wchar_t singleCharDelim = L',';
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std::wstringstream tokenStream(padding.c_str());
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std::wstring token;
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double maxVal = 0;
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size_t* idx = nullptr;
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// Get padding values till we run out of delimiter separated values in the stream
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// Non-numeral values detected will default to 0
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// std::getline will not throw exception unless flags are set on the wstringstream
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// std::stod will throw invalid_argument exception if the input is an invalid double value
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// std::stod will throw out_of_range exception if the input value is more than DBL_MAX
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try
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{
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while (std::getline(tokenStream, token, singleCharDelim))
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{
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// std::stod internally calls wcstod which handles whitespace prefix (which is ignored)
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// & stops the scan when first char outside the range of radix is encountered
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// We'll be permissive till the extent that stod function allows us to be by default
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// Ex. a value like 100.3#535w2 will be read as 100.3, but ;df25 will fail
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const auto curVal = std::stod(token, idx);
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if (curVal > maxVal)
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{
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maxVal = curVal;
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}
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}
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}
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catch (...)
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{
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// If something goes wrong, even if due to a single bad padding value, we'll return default 0 padding
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maxVal = 0;
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LOG_CAUGHT_EXCEPTION();
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}
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return winrt::box_value<double>(maxVal);
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}
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Foundation::IInspectable PaddingConverter::ConvertBack(Foundation::IInspectable const& value,
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Windows::UI::Xaml::Interop::TypeName const& /* targetType */,
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Foundation::IInspectable const& /*parameter*/,
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hstring const& /* language */)
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{
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const auto padding{ winrt::unbox_value<double>(value) };
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return winrt::box_value(winrt::to_hstring(padding));
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}
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}
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