/* | |
* (C) 1999 Lars Knoll (knoll@kde.org) | |
* (C) 2000 Dirk Mueller (mueller@kde.org) | |
* Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved. | |
* Copyright (C) 2006 Andrew Wellington (proton@wiretapped.net) | |
* Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com) | |
* | |
* This library is free software; you can redistribute it and/or | |
* modify it under the terms of the GNU Library General Public | |
* License as published by the Free Software Foundation; either | |
* version 2 of the License, or (at your option) any later version. | |
* | |
* This library is distributed in the hope that it will be useful, | |
* but WITHOUT ANY WARRANTY; without even the implied warranty of | |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
* Library General Public License for more details. | |
* | |
* You should have received a copy of the GNU Library General Public License | |
* along with this library; see the file COPYING.LIB. If not, write to | |
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, | |
* Boston, MA 02110-1301, USA. | |
* | |
*/ | |
#include "config.h" | |
#include "RenderText.h" | |
#include "AXObjectCache.h" | |
#include "CharacterNames.h" | |
#include "EllipsisBox.h" | |
#include "FloatQuad.h" | |
#include "FrameView.h" | |
#include "InlineTextBox.h" | |
#include "Range.h" | |
#include "RenderArena.h" | |
#include "RenderBlock.h" | |
#include "RenderLayer.h" | |
#include "RenderView.h" | |
#include "Text.h" | |
#include "TextBreakIterator.h" | |
#include "VisiblePosition.h" | |
#include "break_lines.h" | |
#include <wtf/AlwaysInline.h> | |
using namespace std; | |
using namespace WTF; | |
using namespace Unicode; | |
namespace WebCore { | |
RenderText::RenderText(Node* node, PassRefPtr<StringImpl> str) | |
: RenderObject(node) | |
, m_minWidth(-1) | |
, m_text(document()->displayStringModifiedByEncoding(str)) | |
, m_firstTextBox(0) | |
, m_lastTextBox(0) | |
, m_maxWidth(-1) | |
, m_beginMinWidth(0) | |
, m_endMinWidth(0) | |
, m_hasTab(false) | |
, m_linesDirty(false) | |
, m_containsReversedText(false) | |
, m_isAllASCII(m_text.containsOnlyASCII()) | |
, m_knownToHaveNoOverflowAndNoFallbackFonts(false) | |
{ | |
ASSERT(m_text); | |
setIsText(); | |
// FIXME: It would be better to call this only if !m_text->containsOnlyWhitespace(). | |
// But that might slow things down, and maybe should only be done if visuallyNonEmpty | |
// is still false. Not making any change for now, but should consider in the future. | |
view()->frameView()->setIsVisuallyNonEmpty(); | |
} | |
#ifndef NDEBUG | |
RenderText::~RenderText() | |
{ | |
ASSERT(!m_firstTextBox); | |
ASSERT(!m_lastTextBox); | |
} | |
#endif | |
const char* RenderText::renderName() const | |
{ | |
return "RenderText"; | |
} | |
bool RenderText::isTextFragment() const | |
{ | |
return false; | |
} | |
bool RenderText::isWordBreak() const | |
{ | |
return false; | |
} | |
void RenderText::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle) | |
{ | |
// There is no need to ever schedule repaints from a style change of a text run, since | |
// we already did this for the parent of the text run. | |
// We do have to schedule layouts, though, since a style change can force us to | |
// need to relayout. | |
if (diff == StyleDifferenceLayout) { | |
setNeedsLayoutAndPrefWidthsRecalc(); | |
m_knownToHaveNoOverflowAndNoFallbackFonts = false; | |
} | |
ETextTransform oldTransform = oldStyle ? oldStyle->textTransform() : TTNONE; | |
ETextSecurity oldSecurity = oldStyle ? oldStyle->textSecurity() : TSNONE; | |
if (oldTransform != style()->textTransform() || oldSecurity != style()->textSecurity()) { | |
if (RefPtr<StringImpl> textToTransform = originalText()) | |
setText(textToTransform.release(), true); | |
} | |
} | |
void RenderText::destroy() | |
{ | |
if (!documentBeingDestroyed()) { | |
if (firstTextBox()) { | |
if (isBR()) { | |
RootInlineBox* next = firstTextBox()->root()->nextRootBox(); | |
if (next) | |
next->markDirty(); | |
} | |
for (InlineTextBox* box = firstTextBox(); box; box = box->nextTextBox()) | |
box->remove(); | |
} else if (parent()) | |
parent()->dirtyLinesFromChangedChild(this); | |
} | |
deleteTextBoxes(); | |
RenderObject::destroy(); | |
} | |
void RenderText::extractTextBox(InlineTextBox* box) | |
{ | |
checkConsistency(); | |
m_lastTextBox = box->prevTextBox(); | |
if (box == m_firstTextBox) | |
m_firstTextBox = 0; | |
if (box->prevTextBox()) | |
box->prevTextBox()->setNextTextBox(0); | |
box->setPreviousTextBox(0); | |
for (InlineTextBox* curr = box; curr; curr = curr->nextTextBox()) | |
curr->setExtracted(); | |
checkConsistency(); | |
} | |
void RenderText::attachTextBox(InlineTextBox* box) | |
{ | |
checkConsistency(); | |
if (m_lastTextBox) { | |
m_lastTextBox->setNextTextBox(box); | |
box->setPreviousTextBox(m_lastTextBox); | |
} else | |
m_firstTextBox = box; | |
InlineTextBox* last = box; | |
for (InlineTextBox* curr = box; curr; curr = curr->nextTextBox()) { | |
curr->setExtracted(false); | |
last = curr; | |
} | |
m_lastTextBox = last; | |
checkConsistency(); | |
} | |
void RenderText::removeTextBox(InlineTextBox* box) | |
{ | |
checkConsistency(); | |
if (box == m_firstTextBox) | |
m_firstTextBox = box->nextTextBox(); | |
if (box == m_lastTextBox) | |
m_lastTextBox = box->prevTextBox(); | |
if (box->nextTextBox()) | |
box->nextTextBox()->setPreviousTextBox(box->prevTextBox()); | |
if (box->prevTextBox()) | |
box->prevTextBox()->setNextTextBox(box->nextTextBox()); | |
checkConsistency(); | |
} | |
void RenderText::deleteTextBoxes() | |
{ | |
if (firstTextBox()) { | |
RenderArena* arena = renderArena(); | |
InlineTextBox* next; | |
for (InlineTextBox* curr = firstTextBox(); curr; curr = next) { | |
next = curr->nextTextBox(); | |
curr->destroy(arena); | |
} | |
m_firstTextBox = m_lastTextBox = 0; | |
} | |
} | |
PassRefPtr<StringImpl> RenderText::originalText() const | |
{ | |
Node* e = node(); | |
return (e && e->isTextNode()) ? static_cast<Text*>(e)->dataImpl() : 0; | |
} | |
void RenderText::absoluteRects(Vector<IntRect>& rects, int tx, int ty) | |
{ | |
for (InlineTextBox* box = firstTextBox(); box; box = box->nextTextBox()) | |
rects.append(IntRect(tx + box->x(), ty + box->y(), box->width(), box->height())); | |
} | |
void RenderText::absoluteRectsForRange(Vector<IntRect>& rects, unsigned start, unsigned end, bool useSelectionHeight) | |
{ | |
// Work around signed/unsigned issues. This function takes unsigneds, and is often passed UINT_MAX | |
// to mean "all the way to the end". InlineTextBox coordinates are unsigneds, so changing this | |
// function to take ints causes various internal mismatches. But selectionRect takes ints, and | |
// passing UINT_MAX to it causes trouble. Ideally we'd change selectionRect to take unsigneds, but | |
// that would cause many ripple effects, so for now we'll just clamp our unsigned parameters to INT_MAX. | |
ASSERT(end == UINT_MAX || end <= INT_MAX); | |
ASSERT(start <= INT_MAX); | |
start = min(start, static_cast<unsigned>(INT_MAX)); | |
end = min(end, static_cast<unsigned>(INT_MAX)); | |
for (InlineTextBox* box = firstTextBox(); box; box = box->nextTextBox()) { | |
// Note: box->end() returns the index of the last character, not the index past it | |
if (start <= box->start() && box->end() < end) { | |
IntRect r = IntRect(box->x(), box->y(), box->width(), box->height()); | |
if (useSelectionHeight) { | |
IntRect selectionRect = box->selectionRect(0, 0, start, end); | |
r.setHeight(selectionRect.height()); | |
r.setY(selectionRect.y()); | |
} | |
FloatPoint origin = localToAbsolute(r.location()); | |
r.setX(origin.x()); | |
r.setY(origin.y()); | |
rects.append(r); | |
} else { | |
unsigned realEnd = min(box->end() + 1, end); | |
IntRect r = box->selectionRect(0, 0, start, realEnd); | |
if (!r.isEmpty()) { | |
if (!useSelectionHeight) { | |
// change the height and y position because selectionRect uses selection-specific values | |
r.setHeight(box->height()); | |
r.setY(box->y()); | |
} | |
FloatPoint origin = localToAbsolute(r.location()); | |
localToAbsolute(origin); | |
r.setX(origin.x()); | |
r.setY(origin.y()); | |
rects.append(r); | |
} | |
} | |
} | |
} | |
void RenderText::absoluteQuads(Vector<FloatQuad>& quads) | |
{ | |
for (InlineTextBox* box = firstTextBox(); box; box = box->nextTextBox()) | |
quads.append(localToAbsoluteQuad(FloatRect(box->x(), box->y(), box->width(), box->height()))); | |
} | |
void RenderText::absoluteQuadsForRange(Vector<FloatQuad>& quads, unsigned start, unsigned end, bool useSelectionHeight) | |
{ | |
// Work around signed/unsigned issues. This function takes unsigneds, and is often passed UINT_MAX | |
// to mean "all the way to the end". InlineTextBox coordinates are unsigneds, so changing this | |
// function to take ints causes various internal mismatches. But selectionRect takes ints, and | |
// passing UINT_MAX to it causes trouble. Ideally we'd change selectionRect to take unsigneds, but | |
// that would cause many ripple effects, so for now we'll just clamp our unsigned parameters to INT_MAX. | |
ASSERT(end == UINT_MAX || end <= INT_MAX); | |
ASSERT(start <= INT_MAX); | |
start = min(start, static_cast<unsigned>(INT_MAX)); | |
end = min(end, static_cast<unsigned>(INT_MAX)); | |
for (InlineTextBox* box = firstTextBox(); box; box = box->nextTextBox()) { | |
// Note: box->end() returns the index of the last character, not the index past it | |
if (start <= box->start() && box->end() < end) { | |
IntRect r = IntRect(box->x(), box->y(), box->width(), box->height()); | |
if (useSelectionHeight) { | |
IntRect selectionRect = box->selectionRect(0, 0, start, end); | |
r.setHeight(selectionRect.height()); | |
r.setY(selectionRect.y()); | |
} | |
quads.append(localToAbsoluteQuad(FloatRect(r))); | |
} else { | |
unsigned realEnd = min(box->end() + 1, end); | |
IntRect r = box->selectionRect(0, 0, start, realEnd); | |
if (r.height()) { | |
if (!useSelectionHeight) { | |
// change the height and y position because selectionRect uses selection-specific values | |
r.setHeight(box->height()); | |
r.setY(box->y()); | |
} | |
quads.append(localToAbsoluteQuad(FloatRect(r))); | |
} | |
} | |
} | |
} | |
InlineTextBox* RenderText::findNextInlineTextBox(int offset, int& pos) const | |
{ | |
// The text runs point to parts of the RenderText's m_text | |
// (they don't include '\n') | |
// Find the text run that includes the character at offset | |
// and return pos, which is the position of the char in the run. | |
if (!m_firstTextBox) | |
return 0; | |
InlineTextBox* s = m_firstTextBox; | |
int off = s->len(); | |
while (offset > off && s->nextTextBox()) { | |
s = s->nextTextBox(); | |
off = s->start() + s->len(); | |
} | |
// we are now in the correct text run | |
pos = (offset > off ? s->len() : s->len() - (off - offset) ); | |
return s; | |
} | |
VisiblePosition RenderText::positionForPoint(const IntPoint& point) | |
{ | |
if (!firstTextBox() || textLength() == 0) | |
return createVisiblePosition(0, DOWNSTREAM); | |
// Get the offset for the position, since this will take rtl text into account. | |
int offset; | |
// FIXME: We should be able to roll these special cases into the general cases in the loop below. | |
if (firstTextBox() && point.y() < firstTextBox()->root()->lineBottom() && point.x() < firstTextBox()->m_x) { | |
// at the y coordinate of the first line or above | |
// and the x coordinate is to the left of the first text box left edge | |
offset = firstTextBox()->offsetForPosition(point.x()); | |
return createVisiblePosition(offset + firstTextBox()->start(), DOWNSTREAM); | |
} | |
if (lastTextBox() && point.y() >= lastTextBox()->root()->lineTop() && point.x() >= lastTextBox()->m_x + lastTextBox()->m_width) { | |
// at the y coordinate of the last line or below | |
// and the x coordinate is to the right of the last text box right edge | |
offset = lastTextBox()->offsetForPosition(point.x()); | |
return createVisiblePosition(offset + lastTextBox()->start(), VP_UPSTREAM_IF_POSSIBLE); | |
} | |
InlineTextBox* lastBoxAbove = 0; | |
for (InlineTextBox* box = firstTextBox(); box; box = box->nextTextBox()) { | |
if (point.y() >= box->root()->lineTop()) { | |
int bottom = box->root()->nextRootBox() ? box->root()->nextRootBox()->lineTop() : box->root()->lineBottom(); | |
if (point.y() < bottom) { | |
offset = box->offsetForPosition(point.x()); | |
if (point.x() == box->m_x) | |
// the x coordinate is equal to the left edge of this box | |
// the affinity must be downstream so the position doesn't jump back to the previous line | |
return createVisiblePosition(offset + box->start(), DOWNSTREAM); | |
if (point.x() < box->m_x + box->m_width) | |
// and the x coordinate is to the left of the right edge of this box | |
// check to see if position goes in this box | |
return createVisiblePosition(offset + box->start(), offset > 0 ? VP_UPSTREAM_IF_POSSIBLE : DOWNSTREAM); | |
if (!box->prevOnLine() && point.x() < box->m_x) | |
// box is first on line | |
// and the x coordinate is to the left of the first text box left edge | |
return createVisiblePosition(offset + box->start(), DOWNSTREAM); | |
if (!box->nextOnLine()) | |
// box is last on line | |
// and the x coordinate is to the right of the last text box right edge | |
// generate VisiblePosition, use UPSTREAM affinity if possible | |
return createVisiblePosition(offset + box->start(), offset > 0 ? VP_UPSTREAM_IF_POSSIBLE : DOWNSTREAM); | |
} | |
lastBoxAbove = box; | |
} | |
} | |
return createVisiblePosition(lastBoxAbove ? lastBoxAbove->start() + lastBoxAbove->len() : 0, DOWNSTREAM); | |
} | |
IntRect RenderText::localCaretRect(InlineBox* inlineBox, int caretOffset, int* extraWidthToEndOfLine) | |
{ | |
if (!inlineBox) | |
return IntRect(); | |
ASSERT(inlineBox->isInlineTextBox()); | |
if (!inlineBox->isInlineTextBox()) | |
return IntRect(); | |
InlineTextBox* box = static_cast<InlineTextBox*>(inlineBox); | |
int height = box->root()->lineBottom() - box->root()->lineTop(); | |
int top = box->root()->lineTop(); | |
int left = box->positionForOffset(caretOffset); | |
// Distribute the caret's width to either side of the offset. | |
int caretWidthLeftOfOffset = caretWidth / 2; | |
left -= caretWidthLeftOfOffset; | |
int caretWidthRightOfOffset = caretWidth - caretWidthLeftOfOffset; | |
int rootLeft = box->root()->x(); | |
int rootRight = rootLeft + box->root()->width(); | |
// FIXME: should we use the width of the root inline box or the | |
// width of the containing block for this? | |
if (extraWidthToEndOfLine) | |
*extraWidthToEndOfLine = (box->root()->width() + rootLeft) - (left + 1); | |
RenderBlock* cb = containingBlock(); | |
if (style()->autoWrap()) { | |
int availableWidth = cb->lineWidth(top, false); | |
if (box->direction() == LTR) | |
left = min(left, rootLeft + availableWidth - caretWidthRightOfOffset); | |
else | |
left = max(left, cb->x()); | |
} else { | |
// If there is no wrapping, the caret can leave its containing block, but not its root line box. | |
if (cb->style()->direction() == LTR) { | |
int rightEdge = max(cb->width(), rootRight); | |
left = min(left, rightEdge - caretWidthRightOfOffset); | |
left = max(left, rootLeft); | |
} else { | |
int leftEdge = min(cb->x(), rootLeft); | |
left = max(left, leftEdge); | |
left = min(left, rootRight - caretWidth); | |
} | |
} | |
return IntRect(left, top, caretWidth, height); | |
} | |
ALWAYS_INLINE int RenderText::widthFromCache(const Font& f, int start, int len, int xPos, HashSet<const SimpleFontData*>* fallbackFonts, GlyphOverflow* glyphOverflow) const | |
{ | |
if (f.isFixedPitch() && !f.isSmallCaps() && m_isAllASCII) { | |
int monospaceCharacterWidth = f.spaceWidth(); | |
int tabWidth = allowTabs() ? monospaceCharacterWidth * 8 : 0; | |
int w = 0; | |
bool isSpace; | |
bool previousCharWasSpace = true; // FIXME: Preserves historical behavior, but seems wrong for start > 0. | |
ASSERT(m_text); | |
StringImpl& text = *m_text.impl(); | |
for (int i = start; i < start + len; i++) { | |
char c = text[i]; | |
if (c <= ' ') { | |
if (c == ' ' || c == '\n') { | |
w += monospaceCharacterWidth; | |
isSpace = true; | |
} else if (c == '\t') { | |
w += tabWidth ? tabWidth - ((xPos + w) % tabWidth) : monospaceCharacterWidth; | |
isSpace = true; | |
} else | |
isSpace = false; | |
} else { | |
w += monospaceCharacterWidth; | |
isSpace = false; | |
} | |
if (isSpace && !previousCharWasSpace) | |
w += f.wordSpacing(); | |
previousCharWasSpace = isSpace; | |
} | |
return w; | |
} | |
return f.width(TextRun(text()->characters() + start, len, allowTabs(), xPos), fallbackFonts, glyphOverflow); | |
} | |
void RenderText::trimmedPrefWidths(int leadWidth, | |
int& beginMinW, bool& beginWS, | |
int& endMinW, bool& endWS, | |
bool& hasBreakableChar, bool& hasBreak, | |
int& beginMaxW, int& endMaxW, | |
int& minW, int& maxW, bool& stripFrontSpaces) | |
{ | |
bool collapseWhiteSpace = style()->collapseWhiteSpace(); | |
if (!collapseWhiteSpace) | |
stripFrontSpaces = false; | |
if (m_hasTab || prefWidthsDirty()) | |
calcPrefWidths(leadWidth); | |
beginWS = !stripFrontSpaces && m_hasBeginWS; | |
endWS = m_hasEndWS; | |
int len = textLength(); | |
if (!len || (stripFrontSpaces && text()->containsOnlyWhitespace())) { | |
beginMinW = 0; | |
endMinW = 0; | |
beginMaxW = 0; | |
endMaxW = 0; | |
minW = 0; | |
maxW = 0; | |
hasBreak = false; | |
return; | |
} | |
minW = m_minWidth; | |
maxW = m_maxWidth; | |
beginMinW = m_beginMinWidth; | |
endMinW = m_endMinWidth; | |
hasBreakableChar = m_hasBreakableChar; | |
hasBreak = m_hasBreak; | |
ASSERT(m_text); | |
StringImpl& text = *m_text.impl(); | |
if (text[0] == ' ' || (text[0] == '\n' && !style()->preserveNewline()) || text[0] == '\t') { | |
const Font& f = style()->font(); // FIXME: This ignores first-line. | |
if (stripFrontSpaces) { | |
const UChar space = ' '; | |
int spaceWidth = f.width(TextRun(&space, 1)); | |
maxW -= spaceWidth; | |
} else | |
maxW += f.wordSpacing(); | |
} | |
stripFrontSpaces = collapseWhiteSpace && m_hasEndWS; | |
if (!style()->autoWrap() || minW > maxW) | |
minW = maxW; | |
// Compute our max widths by scanning the string for newlines. | |
if (hasBreak) { | |
const Font& f = style()->font(); // FIXME: This ignores first-line. | |
bool firstLine = true; | |
beginMaxW = maxW; | |
endMaxW = maxW; | |
for (int i = 0; i < len; i++) { | |
int linelen = 0; | |
while (i + linelen < len && text[i + linelen] != '\n') | |
linelen++; | |
if (linelen) { | |
endMaxW = widthFromCache(f, i, linelen, leadWidth + endMaxW, 0, 0); | |
if (firstLine) { | |
firstLine = false; | |
leadWidth = 0; | |
beginMaxW = endMaxW; | |
} | |
i += linelen; | |
} else if (firstLine) { | |
beginMaxW = 0; | |
firstLine = false; | |
leadWidth = 0; | |
} | |
if (i == len - 1) | |
// A <pre> run that ends with a newline, as in, e.g., | |
// <pre>Some text\n\n<span>More text</pre> | |
endMaxW = 0; | |
} | |
} | |
} | |
static inline bool isSpaceAccordingToStyle(UChar c, RenderStyle* style) | |
{ | |
return c == ' ' || (c == noBreakSpace && style->nbspMode() == SPACE); | |
} | |
int RenderText::minPrefWidth() const | |
{ | |
if (prefWidthsDirty()) | |
const_cast<RenderText*>(this)->calcPrefWidths(0); | |
return m_minWidth; | |
} | |
int RenderText::maxPrefWidth() const | |
{ | |
if (prefWidthsDirty()) | |
const_cast<RenderText*>(this)->calcPrefWidths(0); | |
return m_maxWidth; | |
} | |
void RenderText::calcPrefWidths(int leadWidth) | |
{ | |
HashSet<const SimpleFontData*> fallbackFonts; | |
GlyphOverflow glyphOverflow; | |
calcPrefWidths(leadWidth, fallbackFonts, glyphOverflow); | |
if (fallbackFonts.isEmpty() && !glyphOverflow.left && !glyphOverflow.right && !glyphOverflow.top && !glyphOverflow.bottom) | |
m_knownToHaveNoOverflowAndNoFallbackFonts = true; | |
} | |
void RenderText::calcPrefWidths(int leadWidth, HashSet<const SimpleFontData*>& fallbackFonts, GlyphOverflow& glyphOverflow) | |
{ | |
ASSERT(m_hasTab || prefWidthsDirty() || !m_knownToHaveNoOverflowAndNoFallbackFonts); | |
m_minWidth = 0; | |
m_beginMinWidth = 0; | |
m_endMinWidth = 0; | |
m_maxWidth = 0; | |
if (isBR()) | |
return; | |
int currMinWidth = 0; | |
int currMaxWidth = 0; | |
m_hasBreakableChar = false; | |
m_hasBreak = false; | |
m_hasTab = false; | |
m_hasBeginWS = false; | |
m_hasEndWS = false; | |
const Font& f = style()->font(); // FIXME: This ignores first-line. | |
int wordSpacing = style()->wordSpacing(); | |
int len = textLength(); | |
const UChar* txt = characters(); | |
bool needsWordSpacing = false; | |
bool ignoringSpaces = false; | |
bool isSpace = false; | |
bool firstWord = true; | |
bool firstLine = true; | |
int nextBreakable = -1; | |
int lastWordBoundary = 0; | |
int firstGlyphLeftOverflow = -1; | |
bool breakNBSP = style()->autoWrap() && style()->nbspMode() == SPACE; | |
bool breakAll = (style()->wordBreak() == BreakAllWordBreak || style()->wordBreak() == BreakWordBreak) && style()->autoWrap(); | |
for (int i = 0; i < len; i++) { | |
UChar c = txt[i]; | |
bool previousCharacterIsSpace = isSpace; | |
bool isNewline = false; | |
if (c == '\n') { | |
if (style()->preserveNewline()) { | |
m_hasBreak = true; | |
isNewline = true; | |
isSpace = false; | |
} else | |
isSpace = true; | |
} else if (c == '\t') { | |
if (!style()->collapseWhiteSpace()) { | |
m_hasTab = true; | |
isSpace = false; | |
} else | |
isSpace = true; | |
} else | |
isSpace = c == ' '; | |
if ((isSpace || isNewline) && !i) | |
m_hasBeginWS = true; | |
if ((isSpace || isNewline) && i == len - 1) | |
m_hasEndWS = true; | |
if (!ignoringSpaces && style()->collapseWhiteSpace() && previousCharacterIsSpace && isSpace) | |
ignoringSpaces = true; | |
if (ignoringSpaces && !isSpace) | |
ignoringSpaces = false; | |
// Ignore spaces and soft hyphens | |
if (ignoringSpaces) { | |
ASSERT(lastWordBoundary == i); | |
lastWordBoundary++; | |
continue; | |
} else if (c == softHyphen) { | |
currMaxWidth += widthFromCache(f, lastWordBoundary, i - lastWordBoundary, leadWidth + currMaxWidth, &fallbackFonts, &glyphOverflow); | |
if (firstGlyphLeftOverflow < 0) | |
firstGlyphLeftOverflow = glyphOverflow.left; | |
lastWordBoundary = i + 1; | |
continue; | |
} | |
bool hasBreak = breakAll || isBreakable(txt, i, len, nextBreakable, breakNBSP); | |
bool betweenWords = true; | |
int j = i; | |
while (c != '\n' && !isSpaceAccordingToStyle(c, style()) && c != '\t' && c != softHyphen) { | |
j++; | |
if (j == len) | |
break; | |
c = txt[j]; | |
if (isBreakable(txt, j, len, nextBreakable, breakNBSP)) | |
break; | |
if (breakAll) { | |
betweenWords = false; | |
break; | |
} | |
} | |
int wordLen = j - i; | |
if (wordLen) { | |
int w = widthFromCache(f, i, wordLen, leadWidth + currMaxWidth, &fallbackFonts, &glyphOverflow); | |
if (firstGlyphLeftOverflow < 0) | |
firstGlyphLeftOverflow = glyphOverflow.left; | |
currMinWidth += w; | |
if (betweenWords) { | |
if (lastWordBoundary == i) | |
currMaxWidth += w; | |
else | |
currMaxWidth += widthFromCache(f, lastWordBoundary, j - lastWordBoundary, leadWidth + currMaxWidth, &fallbackFonts, &glyphOverflow); | |
lastWordBoundary = j; | |
} | |
bool isSpace = (j < len) && isSpaceAccordingToStyle(c, style()); | |
bool isCollapsibleWhiteSpace = (j < len) && style()->isCollapsibleWhiteSpace(c); | |
if (j < len && style()->autoWrap()) | |
m_hasBreakableChar = true; | |
// Add in wordSpacing to our currMaxWidth, but not if this is the last word on a line or the | |
// last word in the run. | |
if (wordSpacing && (isSpace || isCollapsibleWhiteSpace) && !containsOnlyWhitespace(j, len-j)) | |
currMaxWidth += wordSpacing; | |
if (firstWord) { | |
firstWord = false; | |
// If the first character in the run is breakable, then we consider ourselves to have a beginning | |
// minimum width of 0, since a break could occur right before our run starts, preventing us from ever | |
// being appended to a previous text run when considering the total minimum width of the containing block. | |
if (hasBreak) | |
m_hasBreakableChar = true; | |
m_beginMinWidth = hasBreak ? 0 : w; | |
} | |
m_endMinWidth = w; | |
if (currMinWidth > m_minWidth) | |
m_minWidth = currMinWidth; | |
currMinWidth = 0; | |
i += wordLen - 1; | |
} else { | |
// Nowrap can never be broken, so don't bother setting the | |
// breakable character boolean. Pre can only be broken if we encounter a newline. | |
if (style()->autoWrap() || isNewline) | |
m_hasBreakableChar = true; | |
if (currMinWidth > m_minWidth) | |
m_minWidth = currMinWidth; | |
currMinWidth = 0; | |
if (isNewline) { // Only set if preserveNewline was true and we saw a newline. | |
if (firstLine) { | |
firstLine = false; | |
leadWidth = 0; | |
if (!style()->autoWrap()) | |
m_beginMinWidth = currMaxWidth; | |
} | |
if (currMaxWidth > m_maxWidth) | |
m_maxWidth = currMaxWidth; | |
currMaxWidth = 0; | |
} else { | |
currMaxWidth += f.width(TextRun(txt + i, 1, allowTabs(), leadWidth + currMaxWidth)); | |
glyphOverflow.right = 0; | |
needsWordSpacing = isSpace && !previousCharacterIsSpace && i == len - 1; | |
} | |
ASSERT(lastWordBoundary == i); | |
lastWordBoundary++; | |
} | |
} | |
if (firstGlyphLeftOverflow > 0) | |
glyphOverflow.left = firstGlyphLeftOverflow; | |
if ((needsWordSpacing && len > 1) || (ignoringSpaces && !firstWord)) | |
currMaxWidth += wordSpacing; | |
m_minWidth = max(currMinWidth, m_minWidth); | |
m_maxWidth = max(currMaxWidth, m_maxWidth); | |
if (!style()->autoWrap()) | |
m_minWidth = m_maxWidth; | |
if (style()->whiteSpace() == PRE) { | |
if (firstLine) | |
m_beginMinWidth = m_maxWidth; | |
m_endMinWidth = currMaxWidth; | |
} | |
setPrefWidthsDirty(false); | |
} | |
bool RenderText::isAllCollapsibleWhitespace() | |
{ | |
int length = textLength(); | |
const UChar* text = characters(); | |
for (int i = 0; i < length; i++) { | |
if (!style()->isCollapsibleWhiteSpace(text[i])) | |
return false; | |
} | |
return true; | |
} | |
bool RenderText::containsOnlyWhitespace(unsigned from, unsigned len) const | |
{ | |
ASSERT(m_text); | |
StringImpl& text = *m_text.impl(); | |
unsigned currPos; | |
for (currPos = from; | |
currPos < from + len && (text[currPos] == '\n' || text[currPos] == ' ' || text[currPos] == '\t'); | |
currPos++) { } | |
return currPos >= (from + len); | |
} | |
IntPoint RenderText::firstRunOrigin() const | |
{ | |
return IntPoint(firstRunX(), firstRunY()); | |
} | |
int RenderText::firstRunX() const | |
{ | |
return m_firstTextBox ? m_firstTextBox->m_x : 0; | |
} | |
int RenderText::firstRunY() const | |
{ | |
return m_firstTextBox ? m_firstTextBox->m_y : 0; | |
} | |
void RenderText::setSelectionState(SelectionState state) | |
{ | |
InlineTextBox* box; | |
RenderObject::setSelectionState(state); | |
if (state == SelectionStart || state == SelectionEnd || state == SelectionBoth) { | |
int startPos, endPos; | |
selectionStartEnd(startPos, endPos); | |
if (selectionState() == SelectionStart) { | |
endPos = textLength(); | |
// to handle selection from end of text to end of line | |
if (startPos != 0 && startPos == endPos) | |
startPos = endPos - 1; | |
} else if (selectionState() == SelectionEnd) | |
startPos = 0; | |
for (box = firstTextBox(); box; box = box->nextTextBox()) { | |
if (box->isSelected(startPos, endPos)) { | |
RootInlineBox* line = box->root(); | |
if (line) | |
line->setHasSelectedChildren(true); | |
} | |
} | |
} else { | |
for (box = firstTextBox(); box; box = box->nextTextBox()) { | |
RootInlineBox* line = box->root(); | |
if (line) | |
line->setHasSelectedChildren(state == SelectionInside); | |
} | |
} | |
// The returned value can be null in case of an orphaned tree. | |
if (RenderBlock* cb = containingBlock()) | |
cb->setSelectionState(state); | |
} | |
void RenderText::setTextWithOffset(PassRefPtr<StringImpl> text, unsigned offset, unsigned len, bool force) | |
{ | |
unsigned oldLen = textLength(); | |
unsigned newLen = text->length(); | |
int delta = newLen - oldLen; | |
unsigned end = len ? offset + len - 1 : offset; | |
RootInlineBox* firstRootBox = 0; | |
RootInlineBox* lastRootBox = 0; | |
bool dirtiedLines = false; | |
// Dirty all text boxes that include characters in between offset and offset+len. | |
for (InlineTextBox* curr = firstTextBox(); curr; curr = curr->nextTextBox()) { | |
// Text run is entirely before the affected range. | |
if (curr->end() < offset) | |
continue; | |
// Text run is entirely after the affected range. | |
if (curr->start() > end) { | |
curr->offsetRun(delta); | |
RootInlineBox* root = curr->root(); | |
if (!firstRootBox) { | |
firstRootBox = root; | |
if (!dirtiedLines) { | |
// The affected area was in between two runs. Go ahead and mark the root box of | |
// the run after the affected area as dirty. | |
firstRootBox->markDirty(); | |
dirtiedLines = true; | |
} | |
} | |
lastRootBox = root; | |
} else if (curr->end() >= offset && curr->end() <= end) { | |
// Text run overlaps with the left end of the affected range. | |
curr->dirtyLineBoxes(); | |
dirtiedLines = true; | |
} else if (curr->start() <= offset && curr->end() >= end) { | |
// Text run subsumes the affected range. | |
curr->dirtyLineBoxes(); | |
dirtiedLines = true; | |
} else if (curr->start() <= end && curr->end() >= end) { | |
// Text run overlaps with right end of the affected range. | |
curr->dirtyLineBoxes(); | |
dirtiedLines = true; | |
} | |
} | |
// Now we have to walk all of the clean lines and adjust their cached line break information | |
// to reflect our updated offsets. | |
if (lastRootBox) | |
lastRootBox = lastRootBox->nextRootBox(); | |
if (firstRootBox) { | |
RootInlineBox* prev = firstRootBox->prevRootBox(); | |
if (prev) | |
firstRootBox = prev; | |
} else if (lastTextBox()) { | |
ASSERT(!lastRootBox); | |
firstRootBox = lastTextBox()->root(); | |
firstRootBox->markDirty(); | |
dirtiedLines = true; | |
} | |
for (RootInlineBox* curr = firstRootBox; curr && curr != lastRootBox; curr = curr->nextRootBox()) { | |
if (curr->lineBreakObj() == this && curr->lineBreakPos() > end) | |
curr->setLineBreakPos(curr->lineBreakPos() + delta); | |
} | |
// If the text node is empty, dirty the line where new text will be inserted. | |
if (!firstTextBox() && parent()) { | |
parent()->dirtyLinesFromChangedChild(this); | |
dirtiedLines = true; | |
} | |
m_linesDirty = dirtiedLines; | |
setText(text, force); | |
} | |
static inline bool isInlineFlowOrEmptyText(RenderObject* o) | |
{ | |
if (o->isRenderInline()) | |
return true; | |
if (!o->isText()) | |
return false; | |
StringImpl* text = toRenderText(o)->text(); | |
if (!text) | |
return true; | |
return !text->length(); | |
} | |
UChar RenderText::previousCharacter() | |
{ | |
// find previous text renderer if one exists | |
RenderObject* previousText = this; | |
while ((previousText = previousText->previousInPreOrder())) | |
if (!isInlineFlowOrEmptyText(previousText)) | |
break; | |
UChar prev = ' '; | |
if (previousText && previousText->isText()) | |
if (StringImpl* previousString = toRenderText(previousText)->text()) | |
prev = (*previousString)[previousString->length() - 1]; | |
return prev; | |
} | |
void RenderText::setTextInternal(PassRefPtr<StringImpl> text) | |
{ | |
ASSERT(text); | |
m_text = document()->displayStringModifiedByEncoding(text); | |
ASSERT(m_text); | |
#if ENABLE(SVG) | |
if (isSVGText()) { | |
if (style() && style()->whiteSpace() == PRE) { | |
// Spec: When xml:space="preserve", the SVG user agent will do the following using a | |
// copy of the original character data content. It will convert all newline and tab | |
// characters into space characters. Then, it will draw all space characters, including | |
// leading, trailing and multiple contiguous space characters. | |
m_text.replace('\n', ' '); | |
// If xml:space="preserve" is set, white-space is set to "pre", which | |
// preserves leading, trailing & contiguous space character for us. | |
} else { | |
// Spec: When xml:space="default", the SVG user agent will do the following using a | |
// copy of the original character data content. First, it will remove all newline | |
// characters. Then it will convert all tab characters into space characters. | |
// Then, it will strip off all leading and trailing space characters. | |
// Then, all contiguous space characters will be consolidated. | |
m_text.replace('\n', StringImpl::empty()); | |
// If xml:space="default" is set, white-space is set to "nowrap", which handles | |
// leading, trailing & contiguous space character removal for us. | |
} | |
m_text.replace('\t', ' '); | |
} | |
#endif | |
if (style()) { | |
switch (style()->textTransform()) { | |
case TTNONE: | |
break; | |
case CAPITALIZE: | |
m_text.makeCapitalized(previousCharacter()); | |
break; | |
case UPPERCASE: | |
m_text.makeUpper(); | |
break; | |
case LOWERCASE: | |
m_text.makeLower(); | |
break; | |
} | |
// We use the same characters here as for list markers. | |
// See the listMarkerText function in RenderListMarker.cpp. | |
switch (style()->textSecurity()) { | |
case TSNONE: | |
break; | |
case TSCIRCLE: | |
m_text.makeSecure(whiteBullet); | |
break; | |
case TSDISC: | |
m_text.makeSecure(bullet); | |
break; | |
case TSSQUARE: | |
m_text.makeSecure(blackSquare); | |
} | |
} | |
ASSERT(m_text); | |
ASSERT(!isBR() || (textLength() == 1 && m_text[0] == '\n')); | |
m_isAllASCII = m_text.containsOnlyASCII(); | |
} | |
void RenderText::setText(PassRefPtr<StringImpl> text, bool force) | |
{ | |
ASSERT(text); | |
if (!force && equal(m_text.impl(), text.get())) | |
return; | |
setTextInternal(text); | |
setNeedsLayoutAndPrefWidthsRecalc(); | |
m_knownToHaveNoOverflowAndNoFallbackFonts = false; | |
AXObjectCache* axObjectCache = document()->axObjectCache(); | |
if (axObjectCache->accessibilityEnabled()) | |
axObjectCache->contentChanged(this); | |
} | |
int RenderText::lineHeight(bool firstLine, bool) const | |
{ | |
// Always use the interior line height of the parent (e.g., if our parent is an inline block). | |
return parent()->lineHeight(firstLine, true); | |
} | |
void RenderText::dirtyLineBoxes(bool fullLayout) | |
{ | |
if (fullLayout) | |
deleteTextBoxes(); | |
else if (!m_linesDirty) { | |
for (InlineTextBox* box = firstTextBox(); box; box = box->nextTextBox()) | |
box->dirtyLineBoxes(); | |
} | |
m_linesDirty = false; | |
} | |
InlineTextBox* RenderText::createTextBox() | |
{ | |
return new (renderArena()) InlineTextBox(this); | |
} | |
InlineTextBox* RenderText::createInlineTextBox() | |
{ | |
InlineTextBox* textBox = createTextBox(); | |
if (!m_firstTextBox) | |
m_firstTextBox = m_lastTextBox = textBox; | |
else { | |
m_lastTextBox->setNextTextBox(textBox); | |
textBox->setPreviousTextBox(m_lastTextBox); | |
m_lastTextBox = textBox; | |
} | |
textBox->setIsText(true); | |
return textBox; | |
} | |
void RenderText::positionLineBox(InlineBox* box) | |
{ | |
InlineTextBox* s = static_cast<InlineTextBox*>(box); | |
// FIXME: should not be needed!!! | |
if (!s->len()) { | |
// We want the box to be destroyed. | |
s->remove(); | |
if (m_firstTextBox == s) | |
m_firstTextBox = s->nextTextBox(); | |
else | |
s->prevTextBox()->setNextTextBox(s->nextTextBox()); | |
if (m_lastTextBox == s) | |
m_lastTextBox = s->prevTextBox(); | |
else | |
s->nextTextBox()->setPreviousTextBox(s->prevTextBox()); | |
s->destroy(renderArena()); | |
return; | |
} | |
m_containsReversedText |= s->direction() == RTL; | |
} | |
unsigned RenderText::width(unsigned from, unsigned len, int xPos, bool firstLine, HashSet<const SimpleFontData*>* fallbackFonts, GlyphOverflow* glyphOverflow) const | |
{ | |
if (from >= textLength()) | |
return 0; | |
if (from + len > textLength()) | |
len = textLength() - from; | |
return width(from, len, style(firstLine)->font(), xPos, fallbackFonts, glyphOverflow); | |
} | |
unsigned RenderText::width(unsigned from, unsigned len, const Font& f, int xPos, HashSet<const SimpleFontData*>* fallbackFonts, GlyphOverflow* glyphOverflow) const | |
{ | |
ASSERT(from + len <= textLength()); | |
if (!characters()) | |
return 0; | |
int w; | |
if (&f == &style()->font()) { | |
if (!style()->preserveNewline() && !from && len == textLength()) { | |
if (fallbackFonts) { | |
ASSERT(glyphOverflow); | |
if (prefWidthsDirty() || !m_knownToHaveNoOverflowAndNoFallbackFonts) { | |
const_cast<RenderText*>(this)->calcPrefWidths(0, *fallbackFonts, *glyphOverflow); | |
if (fallbackFonts->isEmpty() && !glyphOverflow->left && !glyphOverflow->right && !glyphOverflow->top && !glyphOverflow->bottom) | |
m_knownToHaveNoOverflowAndNoFallbackFonts = true; | |
} | |
w = m_maxWidth; | |
} else | |
w = maxPrefWidth(); | |
} else | |
w = widthFromCache(f, from, len, xPos, fallbackFonts, glyphOverflow); | |
} else | |
w = f.width(TextRun(text()->characters() + from, len, allowTabs(), xPos), fallbackFonts, glyphOverflow); | |
return w; | |
} | |
IntRect RenderText::linesBoundingBox() const | |
{ | |
IntRect result; | |
ASSERT(!firstTextBox() == !lastTextBox()); // Either both are null or both exist. | |
if (firstTextBox() && lastTextBox()) { | |
// Return the width of the minimal left side and the maximal right side. | |
int leftSide = 0; | |
int rightSide = 0; | |
for (InlineTextBox* curr = firstTextBox(); curr; curr = curr->nextTextBox()) { | |
if (curr == firstTextBox() || curr->x() < leftSide) | |
leftSide = curr->x(); | |
if (curr == firstTextBox() || curr->x() + curr->width() > rightSide) | |
rightSide = curr->x() + curr->width(); | |
} | |
result.setWidth(rightSide - leftSide); | |
result.setX(leftSide); | |
result.setHeight(lastTextBox()->y() + lastTextBox()->height() - firstTextBox()->y()); | |
result.setY(firstTextBox()->y()); | |
} | |
return result; | |
} | |
IntRect RenderText::clippedOverflowRectForRepaint(RenderBoxModelObject* repaintContainer) | |
{ | |
RenderObject* cb = containingBlock(); | |
return cb->clippedOverflowRectForRepaint(repaintContainer); | |
} | |
IntRect RenderText::selectionRectForRepaint(RenderBoxModelObject* repaintContainer, bool clipToVisibleContent) | |
{ | |
ASSERT(!needsLayout()); | |
if (selectionState() == SelectionNone) | |
return IntRect(); | |
RenderBlock* cb = containingBlock(); | |
if (!cb) | |
return IntRect(); | |
// Now calculate startPos and endPos for painting selection. | |
// We include a selection while endPos > 0 | |
int startPos, endPos; | |
if (selectionState() == SelectionInside) { | |
// We are fully selected. | |
startPos = 0; | |
endPos = textLength(); | |
} else { | |
selectionStartEnd(startPos, endPos); | |
if (selectionState() == SelectionStart) | |
endPos = textLength(); | |
else if (selectionState() == SelectionEnd) | |
startPos = 0; | |
} | |
if (startPos == endPos) | |
return IntRect(); | |
IntRect rect; | |
for (InlineTextBox* box = firstTextBox(); box; box = box->nextTextBox()) { | |
rect.unite(box->selectionRect(0, 0, startPos, endPos)); | |
// Check if there are ellipsis which fall within the selection. | |
unsigned short truncation = box->truncation(); | |
if (truncation != cNoTruncation) { | |
if (EllipsisBox* ellipsis = box->root()->ellipsisBox()) { | |
int ePos = min<int>(endPos - box->start(), box->len()); | |
int sPos = max<int>(startPos - box->start(), 0); | |
// The ellipsis should be considered to be selected if the end of | |
// the selection is past the beginning of the truncation and the | |
// beginning of the selection is before or at the beginning of the | |
// truncation. | |
if (ePos >= truncation && sPos <= truncation) | |
rect.unite(ellipsis->selectionRect(0, 0)); | |
} | |
} | |
} | |
if (clipToVisibleContent) | |
computeRectForRepaint(repaintContainer, rect); | |
else { | |
if (cb->hasColumns()) | |
cb->adjustRectForColumns(rect); | |
rect = localToContainerQuad(FloatRect(rect), repaintContainer).enclosingBoundingBox(); | |
} | |
return rect; | |
} | |
int RenderText::caretMinOffset() const | |
{ | |
InlineTextBox* box = firstTextBox(); | |
if (!box) | |
return 0; | |
int minOffset = box->start(); | |
for (box = box->nextTextBox(); box; box = box->nextTextBox()) | |
minOffset = min<int>(minOffset, box->start()); | |
return minOffset; | |
} | |
int RenderText::caretMaxOffset() const | |
{ | |
InlineTextBox* box = lastTextBox(); | |
if (!box) | |
return textLength(); | |
int maxOffset = box->start() + box->len(); | |
for (box = box->prevTextBox(); box; box = box->prevTextBox()) | |
maxOffset = max<int>(maxOffset, box->start() + box->len()); | |
return maxOffset; | |
} | |
unsigned RenderText::caretMaxRenderedOffset() const | |
{ | |
int l = 0; | |
for (InlineTextBox* box = firstTextBox(); box; box = box->nextTextBox()) | |
l += box->len(); | |
return l; | |
} | |
int RenderText::previousOffset(int current) const | |
{ | |
StringImpl* si = m_text.impl(); | |
TextBreakIterator* iterator = cursorMovementIterator(si->characters(), si->length()); | |
if (!iterator) | |
return current - 1; | |
long result = textBreakPreceding(iterator, current); | |
if (result == TextBreakDone) | |
result = current - 1; | |
#ifdef BUILDING_ON_TIGER | |
// ICU 3.2 allows character breaks before a half-width Katakana voiced mark. | |
if (static_cast<unsigned>(result) < si->length()) { | |
UChar character = (*si)[result]; | |
if (character == 0xFF9E || character == 0xFF9F) | |
--result; | |
} | |
#endif | |
return result; | |
} | |
#define HANGUL_CHOSEONG_START (0x1100) | |
#define HANGUL_CHOSEONG_END (0x115F) | |
#define HANGUL_JUNGSEONG_START (0x1160) | |
#define HANGUL_JUNGSEONG_END (0x11A2) | |
#define HANGUL_JONGSEONG_START (0x11A8) | |
#define HANGUL_JONGSEONG_END (0x11F9) | |
#define HANGUL_SYLLABLE_START (0xAC00) | |
#define HANGUL_SYLLABLE_END (0xD7AF) | |
#define HANGUL_JONGSEONG_COUNT (28) | |
enum HangulState { | |
HangulStateL, | |
HangulStateV, | |
HangulStateT, | |
HangulStateLV, | |
HangulStateLVT, | |
HangulStateBreak | |
}; | |
inline bool isHangulLVT(UChar32 character) | |
{ | |
return (character - HANGUL_SYLLABLE_START) % HANGUL_JONGSEONG_COUNT; | |
} | |
int RenderText::previousOffsetForBackwardDeletion(int current) const | |
{ | |
#if PLATFORM(MAC) | |
ASSERT(m_text); | |
StringImpl& text = *m_text.impl(); | |
UChar32 character; | |
while (current > 0) { | |
if (U16_IS_TRAIL(text[--current])) | |
--current; | |
if (current < 0) | |
break; | |
UChar32 character = text.characterStartingAt(current); | |
// We don't combine characters in Armenian ... Limbu range for backward deletion. | |
if ((character >= 0x0530) && (character < 0x1950)) | |
break; | |
if (u_isbase(character) && (character != 0xFF9E) && (character != 0xFF9F)) | |
break; | |
} | |
if (current <= 0) | |
return current; | |
// Hangul | |
character = text.characterStartingAt(current); | |
if (((character >= HANGUL_CHOSEONG_START) && (character <= HANGUL_JONGSEONG_END)) || ((character >= HANGUL_SYLLABLE_START) && (character <= HANGUL_SYLLABLE_END))) { | |
HangulState state; | |
HangulState initialState; | |
if (character < HANGUL_JUNGSEONG_START) | |
state = HangulStateL; | |
else if (character < HANGUL_JONGSEONG_START) | |
state = HangulStateV; | |
else if (character < HANGUL_SYLLABLE_START) | |
state = HangulStateT; | |
else | |
state = isHangulLVT(character) ? HangulStateLVT : HangulStateLV; | |
initialState = state; | |
while (current > 0 && ((character = text.characterStartingAt(current - 1)) >= HANGUL_CHOSEONG_START) && (character <= HANGUL_SYLLABLE_END) && ((character <= HANGUL_JONGSEONG_END) || (character >= HANGUL_SYLLABLE_START))) { | |
switch (state) { | |
case HangulStateV: | |
if (character <= HANGUL_CHOSEONG_END) | |
state = HangulStateL; | |
else if ((character >= HANGUL_SYLLABLE_START) && (character <= HANGUL_SYLLABLE_END) && !isHangulLVT(character)) | |
state = HangulStateLV; | |
else if (character > HANGUL_JUNGSEONG_END) | |
state = HangulStateBreak; | |
break; | |
case HangulStateT: | |
if ((character >= HANGUL_JUNGSEONG_START) && (character <= HANGUL_JUNGSEONG_END)) | |
state = HangulStateV; | |
else if ((character >= HANGUL_SYLLABLE_START) && (character <= HANGUL_SYLLABLE_END)) | |
state = (isHangulLVT(character) ? HangulStateLVT : HangulStateLV); | |
else if (character < HANGUL_JUNGSEONG_START) | |
state = HangulStateBreak; | |
break; | |
default: | |
state = (character < HANGUL_JUNGSEONG_START) ? HangulStateL : HangulStateBreak; | |
break; | |
} | |
if (state == HangulStateBreak) | |
break; | |
--current; | |
} | |
} | |
return current; | |
#else | |
// Platforms other than Mac delete by one code point. | |
return current - 1; | |
#endif | |
} | |
int RenderText::nextOffset(int current) const | |
{ | |
StringImpl* si = m_text.impl(); | |
TextBreakIterator* iterator = cursorMovementIterator(si->characters(), si->length()); | |
if (!iterator) | |
return current + 1; | |
long result = textBreakFollowing(iterator, current); | |
if (result == TextBreakDone) | |
result = current + 1; | |
#ifdef BUILDING_ON_TIGER | |
// ICU 3.2 allows character breaks before a half-width Katakana voiced mark. | |
if (static_cast<unsigned>(result) < si->length()) { | |
UChar character = (*si)[result]; | |
if (character == 0xFF9E || character == 0xFF9F) | |
++result; | |
} | |
#endif | |
return result; | |
} | |
#ifndef NDEBUG | |
void RenderText::checkConsistency() const | |
{ | |
#ifdef CHECK_CONSISTENCY | |
const InlineTextBox* prev = 0; | |
for (const InlineTextBox* child = m_firstTextBox; child != 0; child = child->nextTextBox()) { | |
ASSERT(child->renderer() == this); | |
ASSERT(child->prevTextBox() == prev); | |
prev = child; | |
} | |
ASSERT(prev == m_lastTextBox); | |
#endif | |
} | |
#endif | |
} // namespace WebCore |