static unsigned leftTruncateToBuffer(const String& string, unsigned length, unsigned keepCount, UChar* buffer, bool shouldInsertEllipsis)
{
ASSERT(keepCount < length);
ASSERT(keepCount < STRING_BUFFER_SIZE);
unsigned startIndex = length - keepCount;
NonSharedCharacterBreakIterator it(string);
unsigned adjustedStartIndex = startIndex;
startIndex = boundedTextBreakFollowing(it, startIndex, length - startIndex);
// Strip single character after ellipsis character, when that character is preceded by a space
if (adjustedStartIndex < length && string[adjustedStartIndex] != space
&& adjustedStartIndex < length - 1 && string[adjustedStartIndex + 1] == space)
++adjustedStartIndex;
// Strip whitespace after the ellipsis character
while (adjustedStartIndex < length && string[adjustedStartIndex] == space)
++adjustedStartIndex;
if (shouldInsertEllipsis) {
buffer[0] = horizontalEllipsis;
StringView(string).substring(adjustedStartIndex, length - adjustedStartIndex + 1).getCharactersWithUpconvert(&buffer[1]);
return length - adjustedStartIndex + 1;
}
StringView(string).substring(adjustedStartIndex, length - adjustedStartIndex + 1).getCharactersWithUpconvert(&buffer[0]);
return length - adjustedStartIndex;
}
static unsigned centerTruncateToBuffer(const String& string, unsigned length, unsigned keepCount, UChar* buffer)
{
ASSERT(keepCount < length);
ASSERT(keepCount < STRING_BUFFER_SIZE);
unsigned omitStart = (keepCount + 1) / 2;
TextBreakIterator* it = characterBreakIterator(string.characters(), length);
unsigned omitEnd = boundedTextBreakFollowing(it, omitStart + (length - keepCount) - 1, length);
omitStart = textBreakAtOrPreceding(it, omitStart);
unsigned truncatedLength = omitStart + 1 + (length - omitEnd);
ASSERT(truncatedLength <= length);
memcpy(buffer, string.characters(), sizeof(UChar) * omitStart);
buffer[omitStart] = horizontalEllipsis;
memcpy(&buffer[omitStart + 1], &string.characters()[omitEnd], sizeof(UChar) * (length - omitEnd));
return truncatedLength;
}
static unsigned centerTruncateToBuffer(const String& string, unsigned length, unsigned keepCount, UChar* buffer)
{
ASSERT(keepCount < length);
ASSERT(keepCount < STRING_BUFFER_SIZE);
unsigned omitStart = (keepCount + 1) / 2;
NonSharedCharacterBreakIterator it(string);
unsigned omitEnd = boundedTextBreakFollowing(it, omitStart + (length - keepCount) - 1, length);
omitStart = textBreakAtOrPreceding(it, omitStart);
unsigned truncatedLength = omitStart + 1 + (length - omitEnd);
ASSERT(truncatedLength <= length);
string.copyTo(buffer, 0, omitStart);
buffer[omitStart] = horizontalEllipsis;
string.copyTo(&buffer[omitStart + 1], omitEnd, length - omitEnd);
return truncatedLength;
}
static unsigned centerTruncateToBuffer(const String& string, unsigned length, unsigned keepCount, UChar* buffer, bool shouldInsertEllipsis)
{
ASSERT_WITH_SECURITY_IMPLICATION(keepCount < length);
ASSERT_WITH_SECURITY_IMPLICATION(keepCount < STRING_BUFFER_SIZE);
unsigned omitStart = (keepCount + 1) / 2;
NonSharedCharacterBreakIterator it(StringView(string).substring(0, length));
unsigned omitEnd = boundedTextBreakFollowing(it, omitStart + (length - keepCount) - 1, length);
omitStart = textBreakAtOrPreceding(it, omitStart);
#if PLATFORM(IOS)
// FIXME: We should guard this code behind an editing behavior. Then we can remove the PLATFORM(IOS)-guard.
// Or just turn it on for all platforms. It seems like good behavior everywhere. Might be better to generalize
// it to handle all whitespace, not just "space".
// Strip single character before ellipsis character, when that character is preceded by a space
if (omitStart > 1 && string[omitStart - 1] != space && omitStart > 2 && string[omitStart - 2] == space)
--omitStart;
// Strip whitespace before and after the ellipsis character
while (omitStart > 1 && string[omitStart - 1] == space)
--omitStart;
// Strip single character after ellipsis character, when that character is followed by a space
if ((length - omitEnd) > 1 && string[omitEnd] != space && (length - omitEnd) > 2 && string[omitEnd + 1] == space)
++omitEnd;
while ((length - omitEnd) > 1 && string[omitEnd] == space)
++omitEnd;
#endif
unsigned truncatedLength = omitStart + shouldInsertEllipsis + (length - omitEnd);
ASSERT(truncatedLength <= length);
StringView(string).substring(0, omitStart).getCharactersWithUpconvert(buffer);
if (shouldInsertEllipsis)
buffer[omitStart++] = horizontalEllipsis;
StringView(string).substring(omitEnd, length - omitEnd).getCharactersWithUpconvert(&buffer[omitStart]);
return truncatedLength;
}