public static int GetCellLength(RenderContext context, char rune)
{
if (context.LegacyConsole)
{
// Is it represented by a single byte?
// In that case we don't have to calculate the
// actual cell width.
if (context.Encoding.GetByteCount(new[] { rune }) == 1)
{
return(1);
}
}
// TODO: We need to figure out why Segment.SplitLines fails
// if we let wcwidth (which returns -1 instead of 1)
// calculate the size for new line characters.
// That is correct from a Unicode perspective, but the
// algorithm was written before wcwidth was added and used
// to work with string length and not cell length.
if (rune == '\n')
{
return(1);
}
return(UnicodeCalculator.GetWidth(rune));
}
public void Test_Favorite_Emoji()
{
// Given
var length = "💩".Select(c => UnicodeCalculator.GetWidth(c)).Sum();
// Then
length.ShouldBe(2);
}
public void Test_Combining_Enclosing()
{
// Given
const string phrase = "\u0410\u0488";
var expected = new[] { 1, 0 };
// When
var length = phrase.Select(c => UnicodeCalculator.GetWidth(c));
// Then
length.ShouldBe(expected);
}
public void Test_Combining_Cafe_Width()
{
// Given
const string phrase = "cafe\u0301";
var expected = new[] { 1, 1, 1, 1, 0 };
// When
var length = phrase.Select(c => UnicodeCalculator.GetWidth(c));
// Then
length.ShouldBe(expected);
}
public void Test_Control_C0_Width()
{
// Given
const string phrase = "\x1b[0m";
var expected = new[] { -1, 1, 1, 1 };
// When
var length = phrase.Select(c => UnicodeCalculator.GetWidth(c));
// Then
length.ShouldBe(expected);
}
public void Test_Null_Width()
{
// Given
const string phrase = "abc\x0000def";
var expected = new[] { 1, 1, 1, 0, 1, 1, 1 };
// When
var length = phrase.Select(c => UnicodeCalculator.GetWidth(c));
// Then
length.ShouldBe(expected);
}
public void Test_Hello_Japanese()
{
// Given
const string phrase = "コンニチハ, セカイ!";
var expected = new[] { 2, 2, 2, 2, 2, 1, 1, 2, 2, 2, 1 };
// When
var length = phrase.Select(c => UnicodeCalculator.GetWidth(c));
// Then
length.ShouldBe(expected);
}
public void Test_Rune_Overload()
{
// Given
var scalar = new Rune(0x1F32D); // 🌭
var expected = 2;
// When
var length = UnicodeCalculator.GetWidth(scalar);
// Then
length.ShouldBe(expected);
}
public void Test_Int32_Overload()
{
// Given
const int codePoint = 0x1F680; // 🚀
var expected = 2;
// When
var length = UnicodeCalculator.GetWidth(codePoint);
// Then
length.ShouldBe(expected);
}
public void Test_Combining_Spacing()
{
// Given
const string phrase = "\u1B13\u1B28\u1B2E\u1B44";
var expected = new[] { 1, 1, 1, 1 };
// When
var length = phrase.Select(c => UnicodeCalculator.GetWidth(c));
// Then
length.ShouldBe(expected);
}
public static int GetCellLength(char rune)
{
// TODO: We need to figure out why Segment.SplitLines fails
// if we let wcwidth (which returns -1 instead of 1)
// calculate the size for new line characters.
// That is correct from a Unicode perspective, but the
// algorithm was written before wcwidth was added and used
// to work with string length and not cell length.
if (rune == '\n')
{
return(1);
}
return(UnicodeCalculator.GetWidth(rune));
}
public static int GetCellLength(RenderContext context, string text)
{
return(text.Sum(rune =>
{
if (context.LegacyConsole)
{
// Is it represented by a single byte?
// In that case we don't have to calculate the
// actual cell width.
if (context.Encoding.GetByteCount(new[] { rune }) == 1)
{
return 1;
}
}
return UnicodeCalculator.GetWidth(rune);
}));
}
