public static string NormalizeTextDirection(this string data)
{
if (data.Length > 0)
{
var lastCharacterDirection = NativeUtils.GetDirectionality(data[data.Length - 1]);
// 1 = LTR
// 2 = RTL
// 8 = NEUTRAL
// If the last character has strong directionality (direction is not null), then the text direction for the string is already consistent.
if (lastCharacterDirection == 8)
{
// If the last character has no directionality (neutral character, direction is null), then we may need to add a direction marker to
// ensure that the last character doesn't inherit directionality from the outside context.
var appTextDirection = 1; // checks the <html> element's "dir" attribute.
var dataTextDirection = NativeUtils.GetDirectionality(data); // Run through the string until a non-neutral character is encountered,
// which determines the text direction.
if (appTextDirection != dataTextDirection)
{
// Add a direction marker only if the data text runs opposite to the directionality of the app as a whole,
// which would cause the neutral characters at the ends to flip.
var directionMarkerCharacter = dataTextDirection == 2 ? "\u200F" : "\u200E";
data += directionMarkerCharacter;
// Prepend the direction marker if the data text begins with a neutral character.
var firstCharacterDirection = NativeUtils.GetDirectionality(data[0]);
if (firstCharacterDirection == 8)
{
data = directionMarkerCharacter + data;
}
}
}
}
return(data);
}