// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.Diagnostics;
namespace System.Text
{
internal static class UnicodeDebug
{
[Conditional("DEBUG")]
internal static void AssertIsBmpCodePoint(uint codePoint)
{
if (!UnicodeUtility.IsBmpCodePoint(codePoint))
{
Debug.Fail($"The value {ToHexString(codePoint)} is not a valid BMP code point.");
}
}
[Conditional("DEBUG")]
internal static void AssertIsHighSurrogateCodePoint(uint codePoint)
{
if (!UnicodeUtility.IsHighSurrogateCodePoint(codePoint))
{
Debug.Fail($"The value {ToHexString(codePoint)} is not a valid UTF-16 high surrogate code point.");
}
}
[Conditional("DEBUG")]
internal static void AssertIsLowSurrogateCodePoint(uint codePoint)
{
if (!UnicodeUtility.IsLowSurrogateCodePoint(codePoint))
{
Debug.Fail($"The value {ToHexString(codePoint)} is not a valid UTF-16 low surrogate code point.");
}
}
[Conditional("DEBUG")]
internal static void AssertIsValidCodePoint(uint codePoint)
{
if (!UnicodeUtility.IsValidCodePoint(codePoint))
{
Debug.Fail($"The value {ToHexString(codePoint)} is not a valid Unicode code point.");
}
}
[Conditional("DEBUG")]
internal static void AssertIsValidScalar(uint scalarValue)
{
if (!UnicodeUtility.IsValidUnicodeScalar(scalarValue))
{
Debug.Fail($"The value {ToHexString(scalarValue)} is not a valid Unicode scalar value.");
}
}
[Conditional("DEBUG")]
internal static void AssertIsValidSupplementaryPlaneScalar(uint scalarValue)
{
if (!UnicodeUtility.IsValidUnicodeScalar(scalarValue) || UnicodeUtility.IsBmpCodePoint(scalarValue))
{
Debug.Fail($"The value {ToHexString(scalarValue)} is not a valid supplementary plane Unicode scalar value.");
}
}
/// <summary>
/// Formats a code point as the hex string "U+XXXX".
/// </summary>
/// <remarks>
/// The input value doesn't have to be a real code point in the Unicode codespace. It can be any integer.
/// </remarks>
private static string ToHexString(uint codePoint)
{
return FormattableString.Invariant($"U+{codePoint:X4}");
}
}
}
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