public StringBuffer Prepare(String src, StringPrepOptions options)
{
int ch;
String mapOut = Map(src, options);
UCharacterIterator iter = UCharacterIterator.GetInstance(mapOut);
UCharacterDirection direction = UCharacterDirectionExtensions.CharDirectionCount,
firstCharDir = UCharacterDirectionExtensions.CharDirectionCount;
int rtlPos = -1, ltrPos = -1;
bool rightToLeft = false, leftToRight = false;
while ((ch = iter.NextCodePoint()) != UCharacterIterator.Done)
{
if (transform.prohibitedSet.Contains(ch) == true && ch != 0x0020)
{
throw new StringPrepParseException("A prohibited code point was found in the input",
StringPrepErrorType.ProhibitedError,
iter.GetText(), iter.Index);
}
direction = UChar.GetDirection(ch);
if (firstCharDir == UCharacterDirectionExtensions.CharDirectionCount)
{
firstCharDir = direction;
}
if (direction == UCharacterDirection.LeftToRight)
{
leftToRight = true;
ltrPos = iter.Index - 1;
}
if (direction == UCharacterDirection.RightToLeft || direction == UCharacterDirection.RightToLeftArabic)
{
rightToLeft = true;
rtlPos = iter.Index - 1;
}
}
// satisfy 2
if (leftToRight == true && rightToLeft == true)
{
throw new StringPrepParseException("The input does not conform to the rules for BiDi code points.",
StringPrepErrorType.CheckBiDiError, iter.GetText(), (rtlPos > ltrPos) ? rtlPos : ltrPos);
}
//satisfy 3
if (rightToLeft == true &&
!((firstCharDir == UCharacterDirection.RightToLeft || firstCharDir == UCharacterDirection.RightToLeftArabic) &&
(direction == UCharacterDirection.RightToLeft || direction == UCharacterDirection.RightToLeftArabic))
)
{
throw new StringPrepParseException("The input does not conform to the rules for BiDi code points.",
StringPrepErrorType.CheckBiDiError, iter.GetText(), (rtlPos > ltrPos) ? rtlPos : ltrPos);
}
return(new StringBuffer(mapOut));
}