public void AppendFormatted_BufferTooSmall_CustomFormatter()
{
var buffer = new char[100];
var provider = new ConstFormatter(" ");
{
MemoryExtensions.TryWriteInterpolatedStringHandler b = new MemoryExtensions.TryWriteInterpolatedStringHandler(0, 0, buffer.AsSpan(0, 0), provider, out bool shouldAppend);
Assert.True(shouldAppend);
// don't use custom formatter
Assert.True(b.AppendLiteral(""));
Assert.True(b.AppendFormatted("".AsSpan()));
Assert.True(b.AppendFormatted("".AsSpan(), alignment: 0, format: "X2"));
// do use custom formatter
Assert.False(b.AppendFormatted((object)"", alignment: 0, format: "X2"));
Assert.False(b.AppendFormatted(null));
Assert.False(b.AppendFormatted(""));
Assert.False(b.AppendFormatted("", alignment: 0, format: "X2"));
Assert.False(b.AppendFormatted <string>(""));
Assert.False(b.AppendFormatted <string>("", alignment: 0));
Assert.False(b.AppendFormatted <string>("", format: "X2"));
Assert.False(b.AppendFormatted <string>("", alignment: 0, format: "X2"));
Assert.False(MemoryExtensions.TryWrite(buffer.AsSpan(0, 0), ref b, out int charsWritten));
Assert.Equal(0, charsWritten);
}
}
public void AppendFormatted_BufferTooSmall(int bufferLength)
{
var buffer = new char[bufferLength];
for (int i = 0; i <= 29; i++)
{
MemoryExtensions.TryWriteInterpolatedStringHandler b = new MemoryExtensions.TryWriteInterpolatedStringHandler(0, 0, buffer, out bool shouldAppend);
Assert.True(shouldAppend);
Assert.True(b.AppendLiteral(new string('s', bufferLength)));
bool result = i switch
{
0 => b.AppendLiteral(" "),
1 => b.AppendFormatted((object)" ", alignment: 0, format: "X2"),
2 => b.AppendFormatted(" "),
3 => b.AppendFormatted(" ", alignment: 0, format: "X2"),
4 => b.AppendFormatted <string>(" "),
5 => b.AppendFormatted <string>(" ", alignment: 0),
6 => b.AppendFormatted <string>(" ", format: "X2"),
7 => b.AppendFormatted <string>(" ", alignment: 0, format: "X2"),
8 => b.AppendFormatted(" ".AsSpan()),
9 => b.AppendFormatted(" ".AsSpan(), alignment: 0, format: "X2"),
10 => b.AppendFormatted(new FormattableStringWrapper(" ")),
11 => b.AppendFormatted(new FormattableStringWrapper(" "), alignment: 0),
12 => b.AppendFormatted(new FormattableStringWrapper(" "), format: "X2"),
13 => b.AppendFormatted(new FormattableStringWrapper(" "), alignment: 0, format: "X2"),
14 => b.AppendFormatted(new SpanFormattableStringWrapper(" ")),
15 => b.AppendFormatted(new SpanFormattableStringWrapper(" "), alignment: 0),
16 => b.AppendFormatted(new SpanFormattableStringWrapper(" "), format: "X2"),
17 => b.AppendFormatted(new SpanFormattableStringWrapper(" "), alignment: 0, format: "X2"),
18 => b.AppendFormatted(new FormattableInt32Wrapper(1)),
19 => b.AppendFormatted(new FormattableInt32Wrapper(1), alignment: 0),
20 => b.AppendFormatted(new FormattableInt32Wrapper(1), format: "X2"),
21 => b.AppendFormatted(new FormattableInt32Wrapper(1), alignment: 0, format: "X2"),
22 => b.AppendFormatted(new SpanFormattableInt32Wrapper(1)),
23 => b.AppendFormatted(new SpanFormattableInt32Wrapper(1), alignment: 0),
24 => b.AppendFormatted(new SpanFormattableInt32Wrapper(1), format: "X2"),
25 => b.AppendFormatted(new SpanFormattableInt32Wrapper(1), alignment: 0, format: "X2"),
26 => b.AppendFormatted <string>("", alignment: 1),
27 => b.AppendFormatted <string>("", alignment: -1),
28 => b.AppendFormatted <string>(" ", alignment: 1, format: "X2"),
29 => b.AppendFormatted <string>(" ", alignment: -1, format: "X2"),
_ => throw new Exception(),
};
Assert.False(result);
Assert.False(MemoryExtensions.TryWrite(buffer.AsSpan(0, 0), ref b, out int charsWritten));
Assert.Equal(0, charsWritten);
}
}
public void AppendFormatted_EmptyBuffer_ZeroLengthWritesSuccessful()
{
var buffer = new char[100];
MemoryExtensions.TryWriteInterpolatedStringHandler b = new MemoryExtensions.TryWriteInterpolatedStringHandler(0, 0, buffer.AsSpan(0, 0), out bool shouldAppend);
Assert.True(shouldAppend);
Assert.True(b.AppendLiteral(""));
Assert.True(b.AppendFormatted((object)"", alignment: 0, format: "X2"));
Assert.True(b.AppendFormatted(null));
Assert.True(b.AppendFormatted(""));
Assert.True(b.AppendFormatted("", alignment: 0, format: "X2"));
Assert.True(b.AppendFormatted <string>(""));
Assert.True(b.AppendFormatted <string>("", alignment: 0));
Assert.True(b.AppendFormatted <string>("", format: "X2"));
Assert.True(b.AppendFormatted <string>("", alignment: 0, format: "X2"));
Assert.True(b.AppendFormatted("".AsSpan()));
Assert.True(b.AppendFormatted("".AsSpan(), alignment: 0, format: "X2"));
Assert.True(MemoryExtensions.TryWrite(buffer.AsSpan(0, 0), ref b, out int charsWritten));
Assert.Equal(0, charsWritten);
}
