#include "visible_text.h"
#include "misc/htmltags.h"
#include "rendering/render_text.h"
#include "xml/dom_nodeimpl.h"
#include "xml/dom_position.h"
#include "xml/dom2_rangeimpl.h"
using DOM::DOMString;
using DOM::Node;
using DOM::NodeImpl;
using DOM::offsetInCharacters;
using DOM::Range;
using DOM::RangeImpl;
namespace khtml {
const unsigned short nonBreakingSpace = 0xA0;
class CircularSearchBuffer {
public:
CircularSearchBuffer(const QString &target, bool isCaseSensitive);
~CircularSearchBuffer() { free(m_buffer); }
void clear() { m_cursor = m_buffer; m_bufferFull = false; }
void append(long length, const QChar *characters);
void append(const QChar &);
long neededCharacters() const;
bool isMatch() const;
long length() const { return m_target.length(); }
private:
QString m_target;
bool m_isCaseSensitive;
QChar *m_buffer;
QChar *m_cursor;
bool m_bufferFull;
CircularSearchBuffer(const CircularSearchBuffer&);
CircularSearchBuffer &operator=(const CircularSearchBuffer&);
};
TextIterator::TextIterator() : m_endContainer(0), m_endOffset(0), m_positionNode(0)
{
}
TextIterator::TextIterator(const Range &r, IteratorKind kind) : m_endContainer(0), m_endOffset(0), m_positionNode(0)
{
const RangeImpl *ri = r.handle();
if (!ri)
return;
int exceptionCode = 0;
NodeImpl *startContainer = ri->startContainer(exceptionCode);
long startOffset = ri->startOffset(exceptionCode);
NodeImpl *endContainer = ri->endContainer(exceptionCode);
long endOffset = ri->endOffset(exceptionCode);
if (exceptionCode != 0)
return;
m_endContainer = endContainer;
m_endOffset = endOffset;
m_node = ri->startNode();
if (m_node == 0)
return;
m_offset = m_node == startContainer ? startOffset : 0;
m_handledNode = false;
m_handledChildren = false;
m_pastEndNode = ri->pastEndNode();
m_needAnotherNewline = false;
m_textBox = 0;
m_lastTextNode = 0;
m_lastTextNodeEndedWithCollapsedSpace = false;
if (kind == RUNFINDER)
m_lastCharacter = 0;
else
m_lastCharacter = '\n';
#ifndef NDEBUG
m_positionNode = m_node;
#endif
advance();
}
void TextIterator::advance()
{
assert(m_positionNode);
m_positionNode = 0;
m_textLength = 0;
if (m_needAnotherNewline) {
emitCharacter('\n', m_node->parentNode(), m_node, 1, 1);
m_needAnotherNewline = false;
return;
}
if (m_textBox) {
handleTextBox();
if (m_positionNode) {
return;
}
}
while (m_node && m_node != m_pastEndNode) {
if (!m_handledNode) {
RenderObject *renderer = m_node->renderer();
if (renderer && renderer->isText() && m_node->nodeType() == Node::TEXT_NODE) {
if (renderer->style()->visibility() == VISIBLE) {
m_handledNode = handleTextNode();
}
} else if (renderer && (renderer->isImage() || renderer->isWidget())) {
if (renderer->style()->visibility() == VISIBLE) {
m_handledNode = handleReplacedElement();
}
} else {
m_handledNode = handleNonTextNode();
}
if (m_positionNode) {
return;
}
}
NodeImpl *next = m_handledChildren ? 0 : m_node->firstChild();
m_offset = 0;
if (!next) {
next = m_node->nextSibling();
if (!next) {
if (m_node->traverseNextNode() == m_pastEndNode)
break;
while (!next && m_node->parentNode()) {
m_node = m_node->parentNode();
exitNode();
if (m_positionNode) {
m_handledNode = true;
m_handledChildren = true;
return;
}
next = m_node->nextSibling();
}
}
}
m_node = next;
m_handledNode = false;
m_handledChildren = false;
if (m_positionNode) {
return;
}
}
}
bool TextIterator::handleTextNode()
{
m_lastTextNode = m_node;
RenderText *renderer = static_cast<RenderText *>(m_node->renderer());
DOMString str = m_node->nodeValue();
if (renderer->style()->whiteSpace() == khtml::PRE) {
long runStart = m_offset;
if (m_lastTextNodeEndedWithCollapsedSpace) {
emitCharacter(' ', m_node, 0, runStart, runStart);
return false;
}
long strLength = str.length();
long end = (m_node == m_endContainer) ? m_endOffset : LONG_MAX;
long runEnd = kMin(strLength, end);
m_positionNode = m_node;
m_positionOffsetBaseNode = 0;
m_positionStartOffset = runStart;
m_positionEndOffset = runEnd;
m_textCharacters = str.unicode() + runStart;
m_textLength = runEnd - runStart;
m_lastCharacter = str[runEnd - 1];
return true;
}
if (!renderer->firstTextBox() && str.length() > 0) {
m_lastTextNodeEndedWithCollapsedSpace = true; return true;
}
m_textBox = renderer->firstTextBox();
handleTextBox();
return true;
}
void TextIterator::handleTextBox()
{
RenderText *renderer = static_cast<RenderText *>(m_node->renderer());
DOMString str = m_node->nodeValue();
long start = m_offset;
long end = (m_node == m_endContainer) ? m_endOffset : LONG_MAX;
for (; m_textBox; m_textBox = m_textBox->nextTextBox()) {
long textBoxStart = m_textBox->m_start;
long runStart = kMax(textBoxStart, start);
bool needSpace = m_lastTextNodeEndedWithCollapsedSpace
|| (m_textBox == renderer->firstTextBox() && textBoxStart == runStart && runStart > 0);
if (needSpace && !isCollapsibleWhitespace(m_lastCharacter) && !m_lastCharacter.isNull()) {
emitCharacter(' ', m_node, 0, runStart, runStart);
return;
}
long textBoxEnd = textBoxStart + m_textBox->m_len;
long runEnd = kMin(textBoxEnd, end);
if (runStart < runEnd) {
if (str[runStart] == '\n') {
emitCharacter(' ', m_node, 0, runStart, runStart + 1);
m_offset = runStart + 1;
} else {
long subrunEnd = str.find('\n', runStart);
if (subrunEnd == -1 || subrunEnd > runEnd) {
subrunEnd = runEnd;
}
m_offset = subrunEnd;
m_positionNode = m_node;
m_positionOffsetBaseNode = 0;
m_positionStartOffset = runStart;
m_positionEndOffset = subrunEnd;
m_textCharacters = str.unicode() + runStart;
m_textLength = subrunEnd - runStart;
m_lastTextNodeEndedWithCollapsedSpace = false;
m_lastCharacter = str[subrunEnd - 1];
}
if (m_positionEndOffset < textBoxEnd) {
return;
}
InlineTextBox *nextTextBox = m_textBox->nextTextBox();
long nextRunStart = nextTextBox ? nextTextBox->m_start : str.length();
if (nextRunStart > runEnd) {
m_lastTextNodeEndedWithCollapsedSpace = true; }
m_textBox = nextTextBox;
return;
}
}
}
bool TextIterator::handleReplacedElement()
{
if (m_lastTextNodeEndedWithCollapsedSpace) {
emitCharacter(' ', m_lastTextNode->parentNode(), m_lastTextNode, 1, 1);
return false;
}
m_positionNode = m_node->parentNode();
m_positionOffsetBaseNode = m_node;
m_positionStartOffset = 0;
m_positionEndOffset = 1;
m_textCharacters = 0;
m_textLength = 0;
m_lastCharacter = 0;
return true;
}
bool TextIterator::handleNonTextNode()
{
switch (m_node->id()) {
case ID_BR: {
emitCharacter('\n', m_node->parentNode(), m_node, 0, 1);
break;
}
case ID_TD:
case ID_TH:
if (m_lastCharacter != '\n' && m_lastTextNode) {
emitCharacter('\t', m_lastTextNode->parentNode(), m_lastTextNode, 0, 1);
}
break;
case ID_BLOCKQUOTE:
case ID_DD:
case ID_DIV:
case ID_DL:
case ID_DT:
case ID_H1:
case ID_H2:
case ID_H3:
case ID_H4:
case ID_H5:
case ID_H6:
case ID_HR:
case ID_LI:
case ID_OL:
case ID_P:
case ID_PRE:
case ID_TR:
case ID_UL:
if (m_lastCharacter != '\n' && m_lastTextNode) {
emitCharacter('\n', m_lastTextNode->parentNode(), m_lastTextNode, 0, 1);
}
break;
}
return true;
}
void TextIterator::exitNode()
{
bool endLine = false;
bool addNewline = false;
switch (m_node->id()) {
case ID_BLOCKQUOTE:
case ID_DD:
case ID_DIV:
case ID_DL:
case ID_DT:
case ID_HR:
case ID_LI:
case ID_OL:
case ID_PRE:
case ID_TR:
case ID_UL:
endLine = true;
break;
case ID_H1:
case ID_H2:
case ID_H3:
case ID_H4:
case ID_H5:
case ID_H6:
case ID_P: {
endLine = true;
RenderObject *renderer = m_node->renderer();
if (renderer) {
RenderStyle *style = renderer->style();
if (style) {
int bottomMargin = renderer->collapsedMarginBottom();
int fontSize = style->htmlFont().getFontDef().computedPixelSize();
if (bottomMargin * 2 >= fontSize) {
addNewline = true;
}
}
}
break;
}
}
if (m_lastTextNode && endLine) {
if (m_lastCharacter != '\n') {
emitCharacter('\n', m_node->parentNode(), m_node, 1, 1);
assert(!m_needAnotherNewline);
m_needAnotherNewline = addNewline;
} else if (addNewline) {
emitCharacter('\n', m_node->parentNode(), m_node, 1, 1);
}
}
}
void TextIterator::emitCharacter(QChar c, NodeImpl *textNode, NodeImpl *offsetBaseNode, long textStartOffset, long textEndOffset)
{
m_positionNode = textNode;
m_positionOffsetBaseNode = offsetBaseNode;
m_positionStartOffset = textStartOffset;
m_positionEndOffset = textEndOffset;
m_singleCharacterBuffer = c;
m_textCharacters = &m_singleCharacterBuffer;
m_textLength = 1;
m_lastTextNodeEndedWithCollapsedSpace = false;
m_lastCharacter = c;
}
Range TextIterator::range() const
{
if (m_positionNode) {
if (m_positionOffsetBaseNode) {
long index = m_positionOffsetBaseNode->nodeIndex();
m_positionStartOffset += index;
m_positionEndOffset += index;
m_positionOffsetBaseNode = 0;
}
return Range(m_positionNode, m_positionStartOffset, m_positionNode, m_positionEndOffset);
}
if (m_endContainer)
return Range(m_endContainer, m_endOffset, m_endContainer, m_endOffset);
return Range();
}
SimplifiedBackwardsTextIterator::SimplifiedBackwardsTextIterator() : m_positionNode(0)
{
}
SimplifiedBackwardsTextIterator::SimplifiedBackwardsTextIterator(const Range &r)
{
if (r.isNull()) {
m_positionNode = 0;
return;
}
NodeImpl *startNode = r.startContainer().handle();
NodeImpl *endNode = r.endContainer().handle();
long startOffset = r.startOffset();
long endOffset = r.endOffset();
if (!offsetInCharacters(startNode->nodeType())) {
if (startOffset >= 0 && startOffset < static_cast<long>(startNode->childNodeCount())) {
startNode = startNode->childNode(startOffset);
startOffset = 0;
}
}
if (!offsetInCharacters(endNode->nodeType())) {
if (endOffset > 0 && endOffset <= static_cast<long>(endNode->childNodeCount())) {
endNode = endNode->childNode(endOffset - 1);
endOffset = endNode->hasChildNodes() ? endNode->childNodeCount() : endNode->maxOffset();
}
}
m_node = endNode;
m_offset = endOffset;
m_handledNode = false;
m_handledChildren = endOffset == 0;
m_startNode = startNode;
m_startOffset = startOffset;
#ifndef NDEBUG
m_positionNode = endNode;
#endif
m_lastTextNode = 0;
m_lastCharacter = '\n';
advance();
}
void SimplifiedBackwardsTextIterator::advance()
{
assert(m_positionNode);
m_positionNode = 0;
m_textLength = 0;
while (m_node) {
if (!m_handledNode) {
RenderObject *renderer = m_node->renderer();
if (renderer && renderer->isText() && m_node->nodeType() == Node::TEXT_NODE) {
if (renderer->style()->visibility() == VISIBLE && m_offset > 0) {
m_handledNode = handleTextNode();
}
} else if (renderer && (renderer->isImage() || renderer->isWidget())) {
if (renderer->style()->visibility() == VISIBLE && m_offset > 0) {
m_handledNode = handleReplacedElement();
}
} else {
m_handledNode = handleNonTextNode();
}
if (m_positionNode) {
return;
}
}
if (m_node == m_startNode)
return;
NodeImpl *next = 0;
if (!m_handledChildren) {
next = m_node->lastChild();
while (next && next->lastChild())
next = next->lastChild();
m_handledChildren = true;
}
if (!next && m_node != m_startNode) {
next = m_node->previousSibling();
if (next) {
exitNode();
while (next->lastChild())
next = next->lastChild();
}
else if (m_node->parentNode()) {
next = m_node->parentNode();
exitNode();
}
}
if (next && m_node->renderer() && m_node->renderer()->style()->visibility() == VISIBLE) {
NodeImpl *block = m_node->enclosingBlockFlowElement();
if (block) {
NodeImpl *nextBlock = next->enclosingBlockFlowElement();
if (nextBlock && nextBlock->isAncestor(block))
emitNewlineForBROrText();
}
}
m_node = next;
if (m_node)
m_offset = m_node->caretMaxOffset();
else
m_offset = 0;
m_handledNode = false;
if (m_positionNode) {
return;
}
}
}
bool SimplifiedBackwardsTextIterator::handleTextNode()
{
m_lastTextNode = m_node;
RenderText *renderer = static_cast<RenderText *>(m_node->renderer());
DOMString str = m_node->nodeValue();
if (!renderer->firstTextBox() && str.length() > 0) {
return true;
}
m_positionEndOffset = m_offset;
m_offset = (m_node == m_startNode) ? m_startOffset : 0;
m_positionNode = m_node;
m_positionStartOffset = m_offset;
m_textLength = m_positionEndOffset - m_positionStartOffset;
m_textCharacters = str.unicode() + m_positionStartOffset;
m_lastCharacter = str[m_positionEndOffset - 1];
return true;
}
bool SimplifiedBackwardsTextIterator::handleReplacedElement()
{
long offset = m_node->nodeIndex();
m_positionNode = m_node->parentNode();
m_positionStartOffset = offset;
m_positionEndOffset = offset + 1;
m_textCharacters = 0;
m_textLength = 0;
m_lastCharacter = 0;
return true;
}
bool SimplifiedBackwardsTextIterator::handleNonTextNode()
{
switch (m_node->id()) {
case ID_BR:
emitNewlineForBROrText();
break;
case ID_TD:
case ID_TH:
case ID_BLOCKQUOTE:
case ID_DD:
case ID_DIV:
case ID_DL:
case ID_DT:
case ID_H1:
case ID_H2:
case ID_H3:
case ID_H4:
case ID_H5:
case ID_H6:
case ID_HR:
case ID_P:
case ID_PRE:
case ID_TR:
case ID_OL:
case ID_UL:
case ID_LI:
emitCharacter(' ', m_node, 0, 0);
break;
}
return true;
}
void SimplifiedBackwardsTextIterator::exitNode()
{
handleNonTextNode();
}
void SimplifiedBackwardsTextIterator::emitCharacter(QChar c, NodeImpl *node, long startOffset, long endOffset)
{
m_singleCharacterBuffer = c;
m_positionNode = node;
m_positionStartOffset = startOffset;
m_positionEndOffset = endOffset;
m_textCharacters = &m_singleCharacterBuffer;
m_textLength = 1;
m_lastCharacter = c;
}
void SimplifiedBackwardsTextIterator::emitNewlineForBROrText()
{
long offset;
if (m_lastTextNode) {
offset = m_lastTextNode->nodeIndex();
emitCharacter('\n', m_lastTextNode->parentNode(), offset, offset + 1);
} else {
offset = m_node->nodeIndex();
emitCharacter('\n', m_node->parentNode(), offset, offset + 1);
}
}
Range SimplifiedBackwardsTextIterator::range() const
{
if (m_positionNode) {
return Range(m_positionNode, m_positionStartOffset, m_positionNode, m_positionEndOffset);
} else {
return Range(m_startNode, m_startOffset, m_startNode, m_startOffset);
}
}
CharacterIterator::CharacterIterator()
: m_offset(0), m_runOffset(0), m_atBreak(true)
{
}
CharacterIterator::CharacterIterator(const Range &r)
: m_offset(0), m_runOffset(0), m_atBreak(true), m_textIterator(r, RUNFINDER)
{
while (!atEnd() && m_textIterator.length() == 0) {
m_textIterator.advance();
}
}
Range CharacterIterator::range() const
{
Range r = m_textIterator.range();
if (!m_textIterator.atEnd()) {
if (m_textIterator.length() <= 1) {
assert(m_runOffset == 0);
} else {
Node n = r.startContainer();
assert(n == r.endContainer());
long offset = r.startOffset() + m_runOffset;
r.setStart(n, offset);
r.setEnd(n, offset + 1);
}
}
return r;
}
void CharacterIterator::advance(long count)
{
assert(!atEnd());
m_atBreak = false;
long remaining = m_textIterator.length() - m_runOffset;
if (count < remaining) {
m_runOffset += count;
m_offset += count;
return;
}
count -= remaining;
m_offset += remaining;
for (m_textIterator.advance(); !atEnd(); m_textIterator.advance()) {
long runLength = m_textIterator.length();
if (runLength == 0) {
m_atBreak = true;
} else {
if (count < runLength) {
m_runOffset = count;
m_offset += count;
return;
}
count -= runLength;
m_offset += runLength;
}
}
m_atBreak = true;
m_runOffset = 0;
}
QString CharacterIterator::string(long numChars)
{
QString result;
result.reserve(numChars);
while (numChars > 0 && !atEnd()) {
long runSize = kMin(numChars, length());
result.append(characters(), runSize);
numChars -= runSize;
advance(runSize);
}
return result;
}
WordAwareIterator::WordAwareIterator()
: m_previousText(0), m_didLookAhead(false)
{
}
WordAwareIterator::WordAwareIterator(const Range &r)
: m_previousText(0), m_didLookAhead(false), m_textIterator(r)
{
m_didLookAhead = true; advance(); }
void WordAwareIterator::advance()
{
m_previousText = 0;
m_buffer = "";
if (!m_didLookAhead) {
assert(!m_textIterator.atEnd());
m_textIterator.advance();
}
m_didLookAhead = false;
while (!m_textIterator.atEnd() && m_textIterator.length() == 0) {
m_textIterator.advance();
}
m_range = m_textIterator.range();
if (m_textIterator.atEnd()) {
return;
}
while (1) {
if (m_textIterator.characters()[m_textIterator.length()-1].isSpace()) {
return;
}
if (m_buffer.isEmpty()) {
m_previousText = m_textIterator.characters();
m_previousLength = m_textIterator.length();
}
m_textIterator.advance();
if (m_textIterator.atEnd() || m_textIterator.length() == 0 || m_textIterator.characters()[0].isSpace()) {
m_didLookAhead = true;
return;
}
if (m_buffer.isEmpty()) {
m_buffer.append(m_previousText, m_previousLength);
m_previousText = 0;
}
m_buffer.append(m_textIterator.characters(), m_textIterator.length());
m_range.setEnd(m_textIterator.range().endContainer(), m_textIterator.range().endOffset());
}
}
long WordAwareIterator::length() const
{
if (!m_buffer.isEmpty()) {
return m_buffer.length();
} else if (m_previousText) {
return m_previousLength;
} else {
return m_textIterator.length();
}
}
const QChar *WordAwareIterator::characters() const
{
if (!m_buffer.isEmpty()) {
return m_buffer.unicode();
} else if (m_previousText) {
return m_previousText;
} else {
return m_textIterator.characters();
}
}
CircularSearchBuffer::CircularSearchBuffer(const QString &s, bool isCaseSensitive)
: m_target(s)
{
assert(!s.isEmpty());
if (!isCaseSensitive) {
m_target = s.lower();
}
m_target.replace(nonBreakingSpace, ' ');
m_isCaseSensitive = isCaseSensitive;
m_buffer = static_cast<QChar *>(malloc(s.length() * sizeof(QChar)));
m_cursor = m_buffer;
m_bufferFull = false;
}
void CircularSearchBuffer::append(const QChar &c)
{
if (m_isCaseSensitive) {
*m_cursor++ = c.unicode() == nonBreakingSpace ? ' ' : c.unicode();
} else {
*m_cursor++ = c.unicode() == nonBreakingSpace ? ' ' : c.lower().unicode();
}
if (m_cursor == m_buffer + length()) {
m_cursor = m_buffer;
m_bufferFull = true;
}
}
void CircularSearchBuffer::append(long count, const QChar *characters)
{
long tailSpace = m_buffer + length() - m_cursor;
assert(!m_bufferFull);
assert(count <= tailSpace);
if (m_isCaseSensitive) {
for (long i = 0; i != count; ++i) {
QChar c = characters[i];
m_cursor[i] = c.unicode() == nonBreakingSpace ? ' ' : c.unicode();
}
} else {
for (long i = 0; i != count; ++i) {
QChar c = characters[i];
m_cursor[i] = c.unicode() == nonBreakingSpace ? ' ' : c.lower().unicode();
}
}
if (count < tailSpace) {
m_cursor += count;
} else {
m_bufferFull = true;
m_cursor = m_buffer;
}
}
long CircularSearchBuffer::neededCharacters() const
{
return m_bufferFull ? 0 : m_buffer + length() - m_cursor;
}
bool CircularSearchBuffer::isMatch() const
{
assert(m_bufferFull);
long headSpace = m_cursor - m_buffer;
long tailSpace = length() - headSpace;
return memcmp(m_cursor, m_target.unicode(), tailSpace * sizeof(QChar)) == 0
&& memcmp(m_buffer, m_target.unicode() + tailSpace, headSpace * sizeof(QChar)) == 0;
}
long TextIterator::rangeLength(const Range &r)
{
long length = 0;
for (TextIterator it(r); !it.atEnd(); it.advance()) {
length += it.length();
}
return length;
}
void TextIterator::setRangeFromLocationAndLength (const Range &range, Range &resultRange, long rangeLocation, long rangeLength)
{
long docTextPosition = 0;
long rangeEnd = rangeLocation + rangeLength;
for (TextIterator it(range); !it.atEnd(); it.advance()) {
long len = it.length();
if (rangeLocation >= docTextPosition && rangeLocation <= docTextPosition + len) {
Range textRunRange = it.range();
if (textRunRange.startContainer().handle()->isTextNode()) {
long offset = rangeLocation - docTextPosition;
resultRange.setStart(textRunRange.startContainer(), offset + textRunRange.startOffset());
} else {
if (rangeLocation == docTextPosition) {
resultRange.setStart(textRunRange.startContainer(), textRunRange.startOffset());
} else {
resultRange.setStart(textRunRange.endContainer(), textRunRange.endOffset());
}
}
}
if (rangeEnd >= docTextPosition && rangeEnd <= docTextPosition + len) {
Range textRunRange = it.range();
if (textRunRange.startContainer().handle()->isTextNode()) {
long offset = rangeEnd - docTextPosition;
resultRange.setEnd(textRunRange.startContainer(), offset + textRunRange.startOffset());
} else {
if (rangeEnd == docTextPosition) {
resultRange.setEnd(textRunRange.startContainer(), textRunRange.startOffset());
} else {
resultRange.setEnd(textRunRange.endContainer(), textRunRange.endOffset());
}
}
if ( !(rangeLength == 0 && rangeEnd == docTextPosition + len) ) {
break;
}
}
docTextPosition += it.length();
}
}
QString plainText(const Range &r)
{
long length = 0;
for (TextIterator it(r); !it.atEnd(); it.advance()) {
length += it.length();
}
QString result("");
result.reserve(length);
for (TextIterator it(r); !it.atEnd(); it.advance()) {
result.append(it.characters(), it.length());
}
return result;
}
Range findPlainText(const Range &r, const QString &s, bool forward, bool caseSensitive)
{
if (s.isEmpty() || s.find('\n') != -1) {
Range result = r;
result.collapse(forward);
return result;
}
CircularSearchBuffer buffer(s, caseSensitive);
bool found = false;
CharacterIterator rangeEnd;
{
CharacterIterator it(r);
while (1) {
while (long needed = buffer.neededCharacters()) {
if (it.atBreak()) {
if (it.atEnd()) {
goto done;
}
buffer.clear();
}
long available = it.length();
long runLength = kMin(needed, available);
buffer.append(runLength, it.characters());
it.advance(runLength);
}
while (1) {
if (buffer.isMatch()) {
found = true;
rangeEnd = it;
if (forward) {
goto done;
}
}
if (it.atBreak())
break;
buffer.append(it.characters()[0]);
it.advance(1);
}
buffer.clear();
}
}
done:
Range result = r;
if (!found) {
result.collapse(!forward);
} else {
CharacterIterator it(r);
it.advance(rangeEnd.characterOffset() - buffer.length());
result.setStart(it.range().startContainer(), it.range().startOffset());
it.advance(buffer.length() - 1);
result.setEnd(it.range().endContainer(), it.range().endOffset());
}
return result;
}
}