void SegmentedString::prepend(const SegmentedSubstring& s)
{
ASSERT(!escaped());
ASSERT(!s.numberOfCharactersConsumed());
if (!s.m_length)
return;
// FIXME: We're assuming that the prepend were originally consumed by
// this SegmentedString. We're also ASSERTing that s is a fresh
// SegmentedSubstring. These assumptions are sufficient for our
// current use, but we might need to handle the more elaborate
// cases in the future.
m_numberOfCharactersConsumedPriorToCurrentString += m_currentString.numberOfCharactersConsumed();
m_numberOfCharactersConsumedPriorToCurrentString -= s.m_length;
if (!m_currentString.m_length) {
m_currentString = s;
updateAdvanceFunctionPointers();
} else {
// Shift our m_currentString into our list.
m_substrings.prepend(m_currentString);
m_currentString = s;
updateAdvanceFunctionPointers();
}
m_empty = false;
}
void SegmentedString::advanceAndUpdateLineNumberSlowCase()
{
if (m_pushedChar1) {
m_pushedChar1 = m_pushedChar2;
m_pushedChar2 = 0;
if (m_pushedChar1) {
m_currentChar = m_pushedChar1;
return;
}
updateAdvanceFunctionPointers();
} else if (m_currentString.m_length) {
if (m_currentString.getCurrentChar() == '\n' && m_currentString.doNotExcludeLineNumbers()) {
++m_currentLine;
// Plus 1 because numberOfCharactersConsumed value hasn't incremented yet; it does with m_length decrement below.
m_numberOfCharactersConsumedPriorToCurrentLine = numberOfCharactersConsumed() + 1;
}
if (--m_currentString.m_length == 0)
advanceSubstring();
else
m_currentString.incrementAndGetCurrentChar(); // Only need the ++
} else if (!isComposite()) {
m_currentString.clear();
m_empty = true;
m_fastPathFlags = NoFastPath;
m_advanceFunc = &SegmentedString::advanceEmpty;
m_advanceAndUpdateLineNumberFunc = &SegmentedString::advanceEmpty;
}
m_currentChar = m_currentString.m_length ? m_currentString.getCurrentChar() : 0;
}
void SegmentedString::setExcludeLineNumbers()
{
if (!m_currentSubstring.doNotExcludeLineNumbers)
return;
m_currentSubstring.doNotExcludeLineNumbers = false;
for (auto& substring : m_otherSubstrings)
substring.doNotExcludeLineNumbers = false;
updateAdvanceFunctionPointers();
}
void SegmentedString::append(const SegmentedSubstring& s)
{
ASSERT(!m_closed);
if (!s.m_length)
return;
if (!m_currentString.m_length) {
m_numberOfCharactersConsumedPriorToCurrentString += m_currentString.numberOfCharactersConsumed();
m_currentString = s;
updateAdvanceFunctionPointers();
} else
m_substrings.append(s);
m_empty = false;
}
void SegmentedString::prepend(const SegmentedSubstring& s, PrependType type) {
ASSERT(!s.numberOfCharactersConsumed());
if (!s.length())
return;
// FIXME: We're also ASSERTing that s is a fresh SegmentedSubstring.
// The assumption is sufficient for our current use, but we might
// need to handle the more elaborate cases in the future.
m_numberOfCharactersConsumedPriorToCurrentString +=
m_currentString.numberOfCharactersConsumed();
if (type == PrependType::Unconsume)
m_numberOfCharactersConsumedPriorToCurrentString -= s.length();
if (!m_currentString.length()) {
m_currentString = s;
updateAdvanceFunctionPointers();
} else {
// Shift our m_currentString into our list.
m_substrings.prepend(m_currentString);
m_currentString = s;
updateAdvanceFunctionPointers();
}
m_empty = false;
}
inline void SegmentedString::appendSubstring(Substring&& substring)
{
ASSERT(!m_isClosed);
if (!substring.length)
return;
if (m_currentSubstring.length)
m_otherSubstrings.append(WTFMove(substring));
else {
m_numberOfCharactersConsumedPriorToCurrentSubstring += m_currentSubstring.numberOfCharactersConsumed();
m_currentSubstring = WTFMove(substring);
m_currentCharacter = m_currentSubstring.currentCharacter();
updateAdvanceFunctionPointers();
}
}
inline void SegmentedString::advancePastSingleCharacterSubstringWithoutUpdatingLineNumber()
{
ASSERT(m_currentSubstring.length == 1);
if (m_otherSubstrings.isEmpty()) {
m_currentSubstring.length = 0;
m_currentCharacter = 0;
updateAdvanceFunctionPointersForEmptyString();
return;
}
m_numberOfCharactersConsumedPriorToCurrentSubstring += m_currentSubstring.numberOfCharactersConsumed();
m_currentSubstring = m_otherSubstrings.takeFirst();
// If we've previously consumed some characters of the non-current string, we now account for those
// characters as part of the current string, not as part of "prior to current string."
m_numberOfCharactersConsumedPriorToCurrentSubstring -= m_currentSubstring.numberOfCharactersConsumed();
m_currentCharacter = m_currentSubstring.currentCharacter();
updateAdvanceFunctionPointers();
}
void SegmentedString::advanceSubstring()
{
if (isComposite()) {
m_numberOfCharactersConsumedPriorToCurrentString += m_currentString.numberOfCharactersConsumed();
m_currentString = m_substrings.takeFirst();
// If we've previously consumed some characters of the non-current
// string, we now account for those characters as part of the current
// string, not as part of "prior to current string."
m_numberOfCharactersConsumedPriorToCurrentString -= m_currentString.numberOfCharactersConsumed();
updateAdvanceFunctionPointers();
} else {
m_currentString.clear();
m_empty = true;
m_fastPathFlags = NoFastPath;
m_advanceFunc = &SegmentedString::advanceEmpty;
m_advanceAndUpdateLineNumberFunc = &SegmentedString::advanceEmpty;
}
}
void SegmentedString::pushBack(String&& string)
{
// We never create a substring for an empty string.
ASSERT(string.length());
// The new substring we will create won't have the doNotExcludeLineNumbers set appropriately.
// That was lost when the characters were consumed before pushing them back. But this does
// not matter, because clients never use this for newlines. Catch that with this assertion.
ASSERT(!string.contains('\n'));
// The characters in the string must be previously consumed characters from this segmented string.
ASSERT(string.length() <= numberOfCharactersConsumed());
m_numberOfCharactersConsumedPriorToCurrentSubstring += m_currentSubstring.numberOfCharactersConsumed();
if (m_currentSubstring.length)
m_otherSubstrings.prepend(WTFMove(m_currentSubstring));
m_currentSubstring = WTFMove(string);
m_numberOfCharactersConsumedPriorToCurrentSubstring -= m_currentSubstring.length;
m_currentCharacter = m_currentSubstring.currentCharacter();
updateAdvanceFunctionPointers();
}
void SegmentedString::advanceSlowCase()
{
if (m_pushedChar1) {
m_pushedChar1 = m_pushedChar2;
m_pushedChar2 = 0;
if (m_pushedChar1) {
m_currentChar = m_pushedChar1;
return;
}
updateAdvanceFunctionPointers();
} else if (m_currentString.m_length) {
if (--m_currentString.m_length == 0)
advanceSubstring();
} else if (!isComposite()) {
m_currentString.clear();
m_empty = true;
m_fastPathFlags = NoFastPath;
m_advanceFunc = &SegmentedString::advanceEmpty;
m_advanceAndUpdateLineNumberFunc = &SegmentedString::advanceEmpty;
}
m_currentChar = m_currentString.m_length ? m_currentString.getCurrentChar() : 0;
}
