Make selection an exclusive range

.github/actions/spelling/expect/expect.txt

@@ -163,6 +163,7 @@ CBN
 cbt
 Ccc
 CCCBB
+CCCDDD
 cch
 CCHAR
 CCmd
@@ -365,6 +366,7 @@ dcommon
 dcompiler
 DComposition
 dde
+DDDCCC
 DDESHARE
 DDevice
 DEADCHAR

src/buffer/out/Row.cpp

@@ -80,19 +80,20 @@ constexpr OutIt copy_n_small(InIt first, Diff count, OutIt dest)
     return dest;
 }
 
-CharToColumnMapper::CharToColumnMapper(const wchar_t* chars, const uint16_t* charOffsets, ptrdiff_t lastCharOffset, til::CoordType currentColumn) noexcept :
+CharToColumnMapper::CharToColumnMapper(const wchar_t* chars, const uint16_t* charOffsets, ptrdiff_t charsLength, til::CoordType currentColumn, til::CoordType columnCount) noexcept :
     _chars{ chars },
     _charOffsets{ charOffsets },
-    _lastCharOffset{ lastCharOffset },
-    _currentColumn{ currentColumn }
+    _charsLength{ charsLength },
+    _currentColumn{ currentColumn },
+    _columnCount{ columnCount }
 {
 }
 
 // If given a position (`offset`) inside the ROW's text, this function will return the corresponding column.
 // This function in particular returns the glyph's first column.
 til::CoordType CharToColumnMapper::GetLeadingColumnAt(ptrdiff_t targetOffset) noexcept
 {
-    targetOffset = clamp(targetOffset, 0, _lastCharOffset);
+    targetOffset = clamp(targetOffset, 0, _charsLength);
 
     // This code needs to fulfill two conditions on top of the obvious (a forward/backward search):
     // A: We never want to stop on a column that is marked with CharOffsetsTrailer (= "GetLeadingColumn").
@@ -130,10 +131,14 @@ til::CoordType CharToColumnMapper::GetLeadingColumnAt(ptrdiff_t targetOffset) no
 til::CoordType CharToColumnMapper::GetTrailingColumnAt(ptrdiff_t offset) noexcept
 {
     auto col = GetLeadingColumnAt(offset);
-    // This loop is a little redundant with the forward search loop in GetLeadingColumnAt()
-    // but it's realistically not worth caring about this. This code is not a bottleneck.
-    for (; WI_IsFlagSet(_charOffsets[col + 1], CharOffsetsTrailer); ++col)
+
+    if (col < _columnCount)
     {
+        // This loop is a little redundant with the forward search loop in GetLeadingColumnAt()
+        // but it's realistically not worth caring about this. This code is not a bottleneck.
+        for (; WI_IsFlagSet(_charOffsets[col + 1], CharOffsetsTrailer); ++col)
+        {
+        }
     }
     return col;
 }
@@ -1114,6 +1119,9 @@ std::wstring_view ROW::GetText() const noexcept
     return { _chars.data(), width };
 }
 
+// Arguments:
+// - columnBegin: inclusive
+// - columnEnd: exclusive
 std::wstring_view ROW::GetText(til::CoordType columnBegin, til::CoordType columnEnd) const noexcept
 {
     const auto columns = GetReadableColumnCount();
@@ -1219,15 +1227,15 @@ T ROW::_adjustForward(T column) const noexcept
 }
 
 // Creates a CharToColumnMapper given an offset into _chars.data().
-// In other words, for a 120 column ROW with just ASCII text, the offset should be [0,120).
+// In other words, for a 120 column ROW with just ASCII text, the offset should be [0,120].
 CharToColumnMapper ROW::_createCharToColumnMapper(ptrdiff_t offset) const noexcept
 {
     const auto charsSize = _charSize();
-    const auto lastChar = gsl::narrow_cast<ptrdiff_t>(charsSize - 1);
+    const auto lastChar = gsl::narrow_cast<ptrdiff_t>(charsSize);
     // We can sort of guess what column belongs to what offset because BMP glyphs are very common and
     // UTF-16 stores them in 1 char. In other words, usually a ROW will have N chars for N columns.
     const auto guessedColumn = gsl::narrow_cast<til::CoordType>(clamp(offset, 0, _columnCount));
-    return CharToColumnMapper{ _chars.data(), _charOffsets.data(), lastChar, guessedColumn };
+    return CharToColumnMapper{ _chars.data(), _charOffsets.data(), lastChar, guessedColumn, _columnCount };
 }
 
 const std::optional<ScrollbarData>& ROW::GetScrollbarData() const noexcept

src/buffer/out/Row.hpp

@@ -71,7 +71,7 @@ struct RowCopyTextFromState
 // into a ROW's text this class can tell you what cell that pointer belongs to.
 struct CharToColumnMapper
 {
-    CharToColumnMapper(const wchar_t* chars, const uint16_t* charOffsets, ptrdiff_t lastCharOffset, til::CoordType currentColumn) noexcept;
+    CharToColumnMapper(const wchar_t* chars, const uint16_t* charOffsets, ptrdiff_t lastCharOffset, til::CoordType currentColumn, til::CoordType columnCount) noexcept;
 
     til::CoordType GetLeadingColumnAt(ptrdiff_t targetOffset) noexcept;
     til::CoordType GetTrailingColumnAt(ptrdiff_t offset) noexcept;
@@ -85,8 +85,9 @@ struct CharToColumnMapper
 
     const wchar_t* _chars;
     const uint16_t* _charOffsets;
-    ptrdiff_t _lastCharOffset;
+    ptrdiff_t _charsLength;
     til::CoordType _currentColumn;
+    til::CoordType _columnCount;
 };
 
 class ROW final

src/buffer/out/UTextAdapter.cpp

@@ -411,16 +411,13 @@ Microsoft::Console::ICU::unique_uregex Microsoft::Console::ICU::CreateRegex(cons
     return unique_uregex{ re };
 }
 
-// Returns an inclusive point range given a text start and end position.
+// Returns a half-open [beg,end) range given a text start and end position.
 // This function is designed to be used with uregex_start64/uregex_end64.
 til::point_span Microsoft::Console::ICU::BufferRangeFromMatch(UText* ut, URegularExpression* re)
 {
     UErrorCode status = U_ZERO_ERROR;
     const auto nativeIndexBeg = uregex_start64(re, 0, &status);
-    auto nativeIndexEnd = uregex_end64(re, 0, &status);
-
-    // The parameters are given as a half-open [beg,end) range, but the point_span we return in closed [beg,end].
-    nativeIndexEnd--;
+    const auto nativeIndexEnd = uregex_end64(re, 0, &status);
 
     const auto& textBuffer = *static_cast<const TextBuffer*>(ut->context);
     til::point_span ret;
@@ -439,7 +436,7 @@ til::point_span Microsoft::Console::ICU::BufferRangeFromMatch(UText* ut, URegula
     if (utextAccess(ut, nativeIndexEnd, true))
     {
         const auto y = accessCurrentRow(ut);
-        ret.end.x = textBuffer.GetRowByOffset(y).GetTrailingColumnAtCharOffset(ut->chunkOffset);
+        ret.end.x = textBuffer.GetRowByOffset(y).GetLeadingColumnAtCharOffset(ut->chunkOffset);
         ret.end.y = y;
     }
     else