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AccessibilityTextHelpers: Fix MSVC/C++20 build issues

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This commit is contained in:
reuk 2022-06-24 18:35:56 +01:00
parent 0e66bb5203
commit 9c0786e4fe
1 changed files with 64 additions and 31 deletions
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95
modules/juce_gui_basics/native/accessibility/juce_AccessibilityTextHelpers.h
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@ -26,33 +26,58 @@
namespace juce
{
template <typename Ptr>
struct CharPtrIteratorTraits
{
using difference_type = int;
using value_type = decltype (*std::declval<Ptr>());
using pointer = value_type*;
using reference = value_type;
using iterator_category = std::bidirectional_iterator_tag;
};
} // namespace juce
namespace std
{
template <> struct iterator_traits<juce::CharPointer_UTF8> : juce::CharPtrIteratorTraits<juce::CharPointer_UTF8> {};
template <> struct iterator_traits<juce::CharPointer_UTF16> : juce::CharPtrIteratorTraits<juce::CharPointer_UTF16> {};
template <> struct iterator_traits<juce::CharPointer_UTF32> : juce::CharPtrIteratorTraits<juce::CharPointer_UTF32> {};
template <> struct iterator_traits<juce::CharPointer_ASCII> : juce::CharPtrIteratorTraits<juce::CharPointer_ASCII> {};
} // namespace std
namespace juce
{
struct AccessibilityTextHelpers
{
/* Wraps a CharPtr into a stdlib-compatible iterator.
MSVC's std::reverse_iterator requires the wrapped iterator to be default constructible
when building in C++20 mode, but I don't really want to add public default constructors to
the CharPtr types. Instead, we add a very basic default constructor here which sets the
wrapped CharPtr to nullptr.
*/
template <typename CharPtr>
class CharPtrIteratorAdapter
{
public:
using difference_type = int;
using value_type = decltype (*std::declval<CharPtr>());
using pointer = value_type*;
using reference = value_type;
using iterator_category = std::bidirectional_iterator_tag;
CharPtrIteratorAdapter() = default;
constexpr explicit CharPtrIteratorAdapter (CharPtr arg) : ptr (arg) {}
constexpr auto operator*() const { return *ptr; }
constexpr CharPtrIteratorAdapter& operator++()
{
++ptr;
return *this;
}
constexpr CharPtrIteratorAdapter& operator--()
{
--ptr;
return *this;
}
constexpr bool operator== (const CharPtrIteratorAdapter& other) const { return ptr == other.ptr; }
constexpr bool operator!= (const CharPtrIteratorAdapter& other) const { return ptr != other.ptr; }
constexpr auto operator+ (difference_type offset) const { return CharPtrIteratorAdapter { ptr + offset }; }
constexpr auto operator- (difference_type offset) const { return CharPtrIteratorAdapter { ptr - offset }; }
private:
CharPtr ptr { {} };
};
template <typename CharPtr>
static auto makeCharPtrIteratorAdapter (CharPtr ptr)
{
return CharPtrIteratorAdapter<CharPtr> { ptr };
}
enum class BoundaryType
{
character,
@ -115,13 +140,17 @@ struct AccessibilityTextHelpers
word.
*/
template <typename CharPtr>
static int findNextWordEndOffset (CharPtr begin,
CharPtr end,
CharPtr ptr,
static int findNextWordEndOffset (CharPtr beginIn,
CharPtr endIn,
CharPtr ptrIn,
Direction direction,
IncludeThisBoundary includeBoundary,
IncludeWhitespaceAfterWords includeWhitespace)
{
const auto begin = makeCharPtrIteratorAdapter (beginIn);
const auto end = makeCharPtrIteratorAdapter (endIn);
const auto ptr = makeCharPtrIteratorAdapter (ptrIn);
const auto move = [&] (auto b, auto e, auto iter)
{
const auto isSpace = [] (juce_wchar c) { return CharacterFunctions::isWhitespace (c); };
@ -155,12 +184,16 @@ struct AccessibilityTextHelpers
specific direction.
*/
template <typename CharPtr>
static int findNextLineOffset (CharPtr begin,
CharPtr end,
CharPtr ptr,
static int findNextLineOffset (CharPtr beginIn,
CharPtr endIn,
CharPtr ptrIn,
Direction direction,
IncludeThisBoundary includeBoundary)
{
const auto begin = makeCharPtrIteratorAdapter (beginIn);
const auto end = makeCharPtrIteratorAdapter (endIn);
const auto ptr = makeCharPtrIteratorAdapter (ptrIn);
const auto findNewline = [] (auto from, auto to) { return std::find (from, to, juce_wchar { '\n' }); };
if (direction == Direction::forwards)