| /* |
| * (C) 1999 Lars Knoll (knoll@kde.org) |
| * (C) 2000 Dirk Mueller (mueller@kde.org) |
| * Copyright (C) 2004, 2005, 2006, 2007, 2013 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 "EllipsisBox.h" |
| #include "FloatQuad.h" |
| #include "Frame.h" |
| #include "FrameView.h" |
| #include "Hyphenation.h" |
| #include "InlineTextBox.h" |
| #include "Range.h" |
| #include "RenderArena.h" |
| #include "RenderBlock.h" |
| #include "RenderCombineText.h" |
| #include "RenderLayer.h" |
| #include "RenderView.h" |
| #include "Settings.h" |
| #include "SimpleLineLayoutFunctions.h" |
| #include "Text.h" |
| #include "TextBreakIterator.h" |
| #include "TextResourceDecoder.h" |
| #include "VisiblePosition.h" |
| #include "break_lines.h" |
| #include <wtf/text/StringBuffer.h> |
| #include <wtf/unicode/CharacterNames.h> |
| |
| using namespace std; |
| using namespace WTF; |
| using namespace Unicode; |
| |
| namespace WebCore { |
| |
| struct SameSizeAsRenderText : public RenderObject { |
| uint32_t bitfields : 16; |
| #if ENABLE(IOS_TEXT_AUTOSIZING) |
| float candidateTextSize; |
| #endif |
| float widths[4]; |
| String text; |
| void* pointers[2]; |
| }; |
| |
| COMPILE_ASSERT(sizeof(RenderText) == sizeof(SameSizeAsRenderText), RenderText_should_stay_small); |
| |
| class SecureTextTimer; |
| typedef HashMap<RenderText*, SecureTextTimer*> SecureTextTimerMap; |
| static SecureTextTimerMap* gSecureTextTimers = 0; |
| |
| class SecureTextTimer : public TimerBase { |
| public: |
| SecureTextTimer(RenderText* renderText) |
| : m_renderText(renderText) |
| , m_lastTypedCharacterOffset(-1) |
| { |
| } |
| |
| void restartWithNewText(unsigned lastTypedCharacterOffset) |
| { |
| m_lastTypedCharacterOffset = lastTypedCharacterOffset; |
| const Settings& settings = m_renderText->frame().settings(); |
| startOneShot(settings.passwordEchoDurationInSeconds()); |
| } |
| void invalidate() { m_lastTypedCharacterOffset = -1; } |
| unsigned lastTypedCharacterOffset() { return m_lastTypedCharacterOffset; } |
| |
| private: |
| virtual void fired() |
| { |
| ASSERT(gSecureTextTimers->contains(m_renderText)); |
| m_renderText->setText(m_renderText->text(), true /* forcing setting text as it may be masked later */); |
| } |
| |
| RenderText* m_renderText; |
| int m_lastTypedCharacterOffset; |
| }; |
| |
| static void makeCapitalized(String* string, UChar previous) |
| { |
| // FIXME: Need to change this to use u_strToTitle instead of u_totitle and to consider locale. |
| |
| if (string->isNull()) |
| return; |
| |
| unsigned length = string->length(); |
| const StringImpl& stringImpl = *string->impl(); |
| |
| if (length >= numeric_limits<unsigned>::max()) |
| CRASH(); |
| |
| StringBuffer<UChar> stringWithPrevious(length + 1); |
| stringWithPrevious[0] = previous == noBreakSpace ? ' ' : previous; |
| for (unsigned i = 1; i < length + 1; i++) { |
| // Replace   with a real space since ICU no longer treats   as a word separator. |
| if (stringImpl[i - 1] == noBreakSpace) |
| stringWithPrevious[i] = ' '; |
| else |
| stringWithPrevious[i] = stringImpl[i - 1]; |
| } |
| |
| TextBreakIterator* boundary = wordBreakIterator(stringWithPrevious.characters(), length + 1); |
| if (!boundary) |
| return; |
| |
| StringBuilder result; |
| result.reserveCapacity(length); |
| |
| int32_t endOfWord; |
| int32_t startOfWord = textBreakFirst(boundary); |
| for (endOfWord = textBreakNext(boundary); endOfWord != TextBreakDone; startOfWord = endOfWord, endOfWord = textBreakNext(boundary)) { |
| if (startOfWord) // Ignore first char of previous string |
| result.append(stringImpl[startOfWord - 1] == noBreakSpace ? noBreakSpace : u_totitle(stringWithPrevious[startOfWord])); |
| for (int i = startOfWord + 1; i < endOfWord; i++) |
| result.append(stringImpl[i - 1]); |
| } |
| |
| *string = result.toString(); |
| } |
| |
| RenderText::RenderText(Text& textNode, const String& text) |
| : RenderObject(textNode) |
| , m_hasTab(false) |
| , m_linesDirty(false) |
| , m_containsReversedText(false) |
| , m_isAllASCII(text.containsOnlyASCII()) |
| , m_knownToHaveNoOverflowAndNoFallbackFonts(false) |
| , m_useBackslashAsYenSymbol(false) |
| #if ENABLE(IOS_TEXT_AUTOSIZING) |
| , m_candidateComputedTextSize(0) |
| #endif |
| , m_minWidth(-1) |
| , m_maxWidth(-1) |
| , m_beginMinWidth(0) |
| , m_endMinWidth(0) |
| , m_text(text) |
| { |
| ASSERT(!m_text.isNull()); |
| setIsText(); |
| m_canUseSimpleFontCodePath = computeCanUseSimpleFontCodePath(); |
| view().frameView().incrementVisuallyNonEmptyCharacterCount(textLength()); |
| } |
| |
| RenderText::RenderText(Document& document, const String& text) |
| : RenderObject(document) |
| , m_hasTab(false) |
| , m_linesDirty(false) |
| , m_containsReversedText(false) |
| , m_isAllASCII(text.containsOnlyASCII()) |
| , m_knownToHaveNoOverflowAndNoFallbackFonts(false) |
| , m_useBackslashAsYenSymbol(false) |
| #if ENABLE(IOS_TEXT_AUTOSIZING) |
| , m_candidateComputedTextSize(0) |
| #endif |
| , m_minWidth(-1) |
| , m_maxWidth(-1) |
| , m_beginMinWidth(0) |
| , m_endMinWidth(0) |
| , m_text(text) |
| { |
| ASSERT(!m_text.isNull()); |
| setIsText(); |
| m_canUseSimpleFontCodePath = computeCanUseSimpleFontCodePath(); |
| view().frameView().incrementVisuallyNonEmptyCharacterCount(textLength()); |
| } |
| |
| #ifndef NDEBUG |
| |
| RenderText::~RenderText() |
| { |
| } |
| |
| #endif |
| |
| const char* RenderText::renderName() const |
| { |
| return "RenderText"; |
| } |
| |
| Text* RenderText::textNode() const |
| { |
| return toText(RenderObject::node()); |
| } |
| |
| bool RenderText::isTextFragment() const |
| { |
| return false; |
| } |
| |
| bool RenderText::computeUseBackslashAsYenSymbol() const |
| { |
| const RenderStyle& style = this->style(); |
| const FontDescription& fontDescription = style.font().fontDescription(); |
| if (style.font().useBackslashAsYenSymbol()) |
| return true; |
| if (fontDescription.isSpecifiedFont()) |
| return false; |
| const TextEncoding* encoding = document().decoder() ? &document().decoder()->encoding() : 0; |
| if (encoding && encoding->backslashAsCurrencySymbol() != '\\') |
| return true; |
| 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; |
| } |
| |
| const RenderStyle& newStyle = style(); |
| bool needsResetText = false; |
| if (!oldStyle) { |
| m_useBackslashAsYenSymbol = computeUseBackslashAsYenSymbol(); |
| needsResetText = m_useBackslashAsYenSymbol; |
| } else if (oldStyle->font().useBackslashAsYenSymbol() != newStyle.font().useBackslashAsYenSymbol()) { |
| m_useBackslashAsYenSymbol = computeUseBackslashAsYenSymbol(); |
| needsResetText = true; |
| } |
| |
| ETextTransform oldTransform = oldStyle ? oldStyle->textTransform() : TTNONE; |
| ETextSecurity oldSecurity = oldStyle ? oldStyle->textSecurity() : TSNONE; |
| if (needsResetText || oldTransform != newStyle.textTransform() || oldSecurity != newStyle.textSecurity()) |
| transformText(); |
| } |
| |
| void RenderText::removeAndDestroyTextBoxes() |
| { |
| if (!documentBeingDestroyed()) |
| m_lineBoxes.removeAllFromParent(*this); |
| m_lineBoxes.deleteAll(); |
| } |
| |
| void RenderText::willBeDestroyed() |
| { |
| if (SecureTextTimer* secureTextTimer = gSecureTextTimers ? gSecureTextTimers->take(this) : 0) |
| delete secureTextTimer; |
| |
| removeAndDestroyTextBoxes(); |
| RenderObject::willBeDestroyed(); |
| } |
| |
| void RenderText::deleteLineBoxesBeforeSimpleLineLayout() |
| { |
| m_lineBoxes.deleteAll(); |
| } |
| |
| String RenderText::originalText() const |
| { |
| return textNode() ? textNode()->data() : String(); |
| } |
| |
| void RenderText::absoluteRects(Vector<IntRect>& rects, const LayoutPoint& accumulatedOffset) const |
| { |
| // FIXME: These will go away when simple layout can do everything. |
| const_cast<RenderText&>(*this).ensureLineBoxes(); |
| |
| rects.appendVector(m_lineBoxes.absoluteRects(accumulatedOffset)); |
| } |
| |
| Vector<IntRect> RenderText::absoluteRectsForRange(unsigned start, unsigned end, bool useSelectionHeight, bool* wasFixed) const |
| { |
| const_cast<RenderText&>(*this).ensureLineBoxes(); |
| |
| // 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)); |
| |
| return m_lineBoxes.absoluteRectsForRange(*this, start, end, useSelectionHeight, wasFixed); |
| } |
| |
| Vector<FloatQuad> RenderText::absoluteQuadsClippedToEllipsis() const |
| { |
| const_cast<RenderText&>(*this).ensureLineBoxes(); |
| |
| return m_lineBoxes.absoluteQuads(*this, nullptr, RenderTextLineBoxes::ClipToEllipsis); |
| } |
| |
| void RenderText::absoluteQuads(Vector<FloatQuad>& quads, bool* wasFixed) const |
| { |
| const_cast<RenderText&>(*this).ensureLineBoxes(); |
| |
| quads.appendVector(m_lineBoxes.absoluteQuads(*this, wasFixed, RenderTextLineBoxes::NoClipping)); |
| } |
| |
| Vector<FloatQuad> RenderText::absoluteQuadsForRange(unsigned start, unsigned end, bool useSelectionHeight, bool* wasFixed) const |
| { |
| const_cast<RenderText&>(*this).ensureLineBoxes(); |
| |
| // 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)); |
| |
| return m_lineBoxes.absoluteQuadsForRange(*this, start, end, useSelectionHeight, wasFixed); |
| } |
| |
| VisiblePosition RenderText::positionForPoint(const LayoutPoint& point) |
| { |
| ensureLineBoxes(); |
| |
| return m_lineBoxes.positionForPoint(*this, point); |
| } |
| |
| LayoutRect RenderText::localCaretRect(InlineBox* inlineBox, int caretOffset, LayoutUnit* extraWidthToEndOfLine) |
| { |
| if (!inlineBox) |
| return LayoutRect(); |
| |
| InlineTextBox* box = toInlineTextBox(inlineBox); |
| float left = box->positionForOffset(caretOffset); |
| return box->root().computeCaretRect(left, caretWidth, extraWidthToEndOfLine); |
| } |
| |
| ALWAYS_INLINE float RenderText::widthFromCache(const Font& f, int start, int len, float xPos, HashSet<const SimpleFontData*>* fallbackFonts, GlyphOverflow* glyphOverflow, const RenderStyle& style) const |
| { |
| if (style.hasTextCombine() && isCombineText()) { |
| const RenderCombineText& combineText = toRenderCombineText(*this); |
| if (combineText.isCombined()) |
| return combineText.combinedTextWidth(f); |
| } |
| |
| if (f.isFixedPitch() && !f.isSmallCaps() && m_isAllASCII && (!glyphOverflow || !glyphOverflow->computeBounds)) { |
| float monospaceCharacterWidth = f.spaceWidth(); |
| float w = 0; |
| bool isSpace; |
| 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') { |
| if (style.collapseWhiteSpace()) { |
| w += monospaceCharacterWidth; |
| isSpace = true; |
| } else { |
| w += f.tabWidth(style.tabSize(), xPos + w); |
| isSpace = false; |
| } |
| } else |
| isSpace = false; |
| } else { |
| w += monospaceCharacterWidth; |
| isSpace = false; |
| } |
| if (isSpace && i > start) |
| w += f.wordSpacing(); |
| } |
| return w; |
| } |
| |
| TextRun run = RenderBlock::constructTextRun(const_cast<RenderText*>(this), f, this, start, len, style); |
| run.setCharactersLength(textLength() - start); |
| ASSERT(run.charactersLength() >= run.length()); |
| |
| run.setCharacterScanForCodePath(!canUseSimpleFontCodePath()); |
| run.setTabSize(!style.collapseWhiteSpace(), style.tabSize()); |
| run.setXPos(xPos); |
| return f.width(run, fallbackFonts, glyphOverflow); |
| } |
| |
| void RenderText::trimmedPrefWidths(float leadWidth, |
| float& beginMinW, bool& beginWS, |
| float& endMinW, bool& endWS, |
| bool& hasBreakableChar, bool& hasBreak, |
| float& beginMaxW, float& endMaxW, |
| float& minW, float& maxW, bool& stripFrontSpaces) |
| { |
| const RenderStyle& style = this->style(); |
| bool collapseWhiteSpace = style.collapseWhiteSpace(); |
| if (!collapseWhiteSpace) |
| stripFrontSpaces = false; |
| |
| if (m_hasTab || preferredLogicalWidthsDirty()) |
| computePreferredLogicalWidths(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& font = style.font(); // FIXME: This ignores first-line. |
| if (stripFrontSpaces) { |
| const UChar space = ' '; |
| float spaceWidth = font.width(RenderBlock::constructTextRun(this, font, &space, 1, style)); |
| maxW -= spaceWidth; |
| } else |
| maxW += font.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, style); |
| 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, const RenderStyle& style) |
| { |
| return c == ' ' || (c == noBreakSpace && style.nbspMode() == SPACE); |
| } |
| |
| float RenderText::minLogicalWidth() const |
| { |
| if (preferredLogicalWidthsDirty()) |
| const_cast<RenderText*>(this)->computePreferredLogicalWidths(0); |
| |
| return m_minWidth; |
| } |
| |
| float RenderText::maxLogicalWidth() const |
| { |
| if (preferredLogicalWidthsDirty()) |
| const_cast<RenderText*>(this)->computePreferredLogicalWidths(0); |
| |
| return m_maxWidth; |
| } |
| |
| void RenderText::computePreferredLogicalWidths(float leadWidth) |
| { |
| HashSet<const SimpleFontData*> fallbackFonts; |
| GlyphOverflow glyphOverflow; |
| computePreferredLogicalWidths(leadWidth, fallbackFonts, glyphOverflow); |
| if (fallbackFonts.isEmpty() && !glyphOverflow.left && !glyphOverflow.right && !glyphOverflow.top && !glyphOverflow.bottom) |
| m_knownToHaveNoOverflowAndNoFallbackFonts = true; |
| } |
| |
| static inline float hyphenWidth(RenderText* renderer, const Font& font) |
| { |
| const RenderStyle& style = renderer->style(); |
| return font.width(RenderBlock::constructTextRun(renderer, font, style.hyphenString().string(), style)); |
| } |
| |
| static float maxWordFragmentWidth(RenderText* renderer, const RenderStyle& style, const Font& font, const UChar* word, int wordLength, int minimumPrefixLength, int minimumSuffixLength, int& suffixStart, HashSet<const SimpleFontData*>& fallbackFonts, GlyphOverflow& glyphOverflow) |
| { |
| suffixStart = 0; |
| if (wordLength <= minimumSuffixLength) |
| return 0; |
| |
| Vector<int, 8> hyphenLocations; |
| int hyphenLocation = wordLength - minimumSuffixLength; |
| while ((hyphenLocation = lastHyphenLocation(word, wordLength, hyphenLocation, style.locale())) >= minimumPrefixLength) |
| hyphenLocations.append(hyphenLocation); |
| |
| if (hyphenLocations.isEmpty()) |
| return 0; |
| |
| hyphenLocations.reverse(); |
| |
| float minimumFragmentWidthToConsider = font.pixelSize() * 5 / 4 + hyphenWidth(renderer, font); |
| float maxFragmentWidth = 0; |
| for (size_t k = 0; k < hyphenLocations.size(); ++k) { |
| int fragmentLength = hyphenLocations[k] - suffixStart; |
| StringBuilder fragmentWithHyphen; |
| fragmentWithHyphen.append(word + suffixStart, fragmentLength); |
| fragmentWithHyphen.append(style.hyphenString()); |
| |
| TextRun run = RenderBlock::constructTextRun(renderer, font, fragmentWithHyphen.characters(), fragmentWithHyphen.length(), style); |
| run.setCharactersLength(fragmentWithHyphen.length()); |
| run.setCharacterScanForCodePath(!renderer->canUseSimpleFontCodePath()); |
| float fragmentWidth = font.width(run, &fallbackFonts, &glyphOverflow); |
| |
| // Narrow prefixes are ignored. See tryHyphenating in RenderBlockLineLayout.cpp. |
| if (fragmentWidth <= minimumFragmentWidthToConsider) |
| continue; |
| |
| suffixStart += fragmentLength; |
| maxFragmentWidth = max(maxFragmentWidth, fragmentWidth); |
| } |
| |
| return maxFragmentWidth; |
| } |
| |
| void RenderText::computePreferredLogicalWidths(float leadWidth, HashSet<const SimpleFontData*>& fallbackFonts, GlyphOverflow& glyphOverflow) |
| { |
| ASSERT(m_hasTab || preferredLogicalWidthsDirty() || !m_knownToHaveNoOverflowAndNoFallbackFonts); |
| |
| m_minWidth = 0; |
| m_beginMinWidth = 0; |
| m_endMinWidth = 0; |
| m_maxWidth = 0; |
| |
| float currMinWidth = 0; |
| float currMaxWidth = 0; |
| m_hasBreakableChar = false; |
| m_hasBreak = false; |
| m_hasTab = false; |
| m_hasBeginWS = false; |
| m_hasEndWS = false; |
| |
| const RenderStyle& style = this->style(); |
| const Font& f = style.font(); // FIXME: This ignores first-line. |
| float wordSpacing = style.wordSpacing(); |
| int len = textLength(); |
| LazyLineBreakIterator breakIterator(m_text, style.locale()); |
| bool needsWordSpacing = false; |
| bool ignoringSpaces = false; |
| bool isSpace = false; |
| bool firstWord = true; |
| bool firstLine = true; |
| int nextBreakable = -1; |
| int lastWordBoundary = 0; |
| |
| // Non-zero only when kerning is enabled, in which case we measure words with their trailing |
| // space, then subtract its width. |
| float wordTrailingSpaceWidth = f.typesettingFeatures() & Kerning ? f.width(RenderBlock::constructTextRun(this, f, &space, 1, style), &fallbackFonts) + wordSpacing : 0; |
| |
| // If automatic hyphenation is allowed, we keep track of the width of the widest word (or word |
| // fragment) encountered so far, and only try hyphenating words that are wider. |
| float maxWordWidth = numeric_limits<float>::max(); |
| int minimumPrefixLength = 0; |
| int minimumSuffixLength = 0; |
| if (style.hyphens() == HyphensAuto && canHyphenate(style.locale())) { |
| maxWordWidth = 0; |
| |
| // Map 'hyphenate-limit-{before,after}: auto;' to 2. |
| minimumPrefixLength = style.hyphenationLimitBefore(); |
| if (minimumPrefixLength < 0) |
| minimumPrefixLength = 2; |
| |
| minimumSuffixLength = style.hyphenationLimitAfter(); |
| if (minimumSuffixLength < 0) |
| minimumSuffixLength = 2; |
| } |
| |
| 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 = characterAt(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 && style.hyphens() != HyphensNone) { |
| currMaxWidth += widthFromCache(f, lastWordBoundary, i - lastWordBoundary, leadWidth + currMaxWidth, &fallbackFonts, &glyphOverflow, style); |
| if (firstGlyphLeftOverflow < 0) |
| firstGlyphLeftOverflow = glyphOverflow.left; |
| lastWordBoundary = i + 1; |
| continue; |
| } |
| |
| bool hasBreak = breakAll || isBreakable(breakIterator, i, nextBreakable, breakNBSP); |
| bool betweenWords = true; |
| int j = i; |
| while (c != '\n' && !isSpaceAccordingToStyle(c, style) && c != '\t' && (c != softHyphen || style.hyphens() == HyphensNone)) { |
| j++; |
| if (j == len) |
| break; |
| c = characterAt(j); |
| if (isBreakable(breakIterator, j, nextBreakable, breakNBSP) && characterAt(j - 1) != softHyphen) |
| break; |
| if (breakAll) { |
| betweenWords = false; |
| break; |
| } |
| } |
| |
| int wordLen = j - i; |
| if (wordLen) { |
| bool isSpace = (j < len) && isSpaceAccordingToStyle(c, style); |
| float w; |
| if (wordTrailingSpaceWidth && isSpace) |
| w = widthFromCache(f, i, wordLen + 1, leadWidth + currMaxWidth, &fallbackFonts, &glyphOverflow, style) - wordTrailingSpaceWidth; |
| else { |
| w = widthFromCache(f, i, wordLen, leadWidth + currMaxWidth, &fallbackFonts, &glyphOverflow, style); |
| if (c == softHyphen && style.hyphens() != HyphensNone) |
| currMinWidth += hyphenWidth(this, f); |
| } |
| |
| if (w > maxWordWidth) { |
| int suffixStart; |
| float maxFragmentWidth = maxWordFragmentWidth(this, style, f, characters() + i, wordLen, minimumPrefixLength, minimumSuffixLength, suffixStart, fallbackFonts, glyphOverflow); |
| |
| if (suffixStart) { |
| float suffixWidth; |
| if (wordTrailingSpaceWidth && isSpace) |
| suffixWidth = widthFromCache(f, i + suffixStart, wordLen - suffixStart + 1, leadWidth + currMaxWidth, 0, 0, style) - wordTrailingSpaceWidth; |
| else |
| suffixWidth = widthFromCache(f, i + suffixStart, wordLen - suffixStart, leadWidth + currMaxWidth, 0, 0, style); |
| |
| maxFragmentWidth = max(maxFragmentWidth, suffixWidth); |
| |
| currMinWidth += maxFragmentWidth - w; |
| maxWordWidth = max(maxWordWidth, maxFragmentWidth); |
| } else |
| maxWordWidth = w; |
| } |
| |
| 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, style); |
| lastWordBoundary = j; |
| } |
| |
| 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 : currMinWidth; |
| } |
| m_endMinWidth = currMinWidth; |
| |
| 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 { |
| TextRun run = RenderBlock::constructTextRun(this, f, this, i, 1, style); |
| run.setCharactersLength(len - i); |
| ASSERT(run.charactersLength() >= run.length()); |
| run.setTabSize(!style.collapseWhiteSpace(), style.tabSize()); |
| run.setXPos(leadWidth + currMaxWidth); |
| |
| currMaxWidth += f.width(run, &fallbackFonts); |
| 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; |
| } |
| |
| setPreferredLogicalWidthsDirty(false); |
| } |
| |
| bool RenderText::isAllCollapsibleWhitespace() const |
| { |
| const RenderStyle& style = this->style(); |
| unsigned length = textLength(); |
| if (is8Bit()) { |
| for (unsigned i = 0; i < length; ++i) { |
| if (!style.isCollapsibleWhiteSpace(characters8()[i])) |
| return false; |
| } |
| return true; |
| } |
| for (unsigned i = 0; i < length; ++i) { |
| if (!style.isCollapsibleWhiteSpace(characters16()[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); |
| } |
| |
| FloatPoint RenderText::firstRunOrigin() const |
| { |
| return IntPoint(firstRunX(), firstRunY()); |
| } |
| |
| float RenderText::firstRunX() const |
| { |
| return firstTextBox() ? firstTextBox()->x() : 0; |
| } |
| |
| float RenderText::firstRunY() const |
| { |
| return firstTextBox() ? firstTextBox()->y() : 0; |
| } |
| |
| void RenderText::setSelectionState(SelectionState state) |
| { |
| if (state != SelectionNone) |
| ensureLineBoxes(); |
| |
| RenderObject::setSelectionState(state); |
| |
| if (canUpdateSelectionOnRootLineBoxes()) |
| m_lineBoxes.setSelectionState(*this, state); |
| |
| // The containing block can be null in case of an orphaned tree. |
| RenderBlock* containingBlock = this->containingBlock(); |
| if (containingBlock && !containingBlock->isRenderView()) |
| containingBlock->setSelectionState(state); |
| } |
| |
| void RenderText::setTextWithOffset(const String& text, unsigned offset, unsigned len, bool force) |
| { |
| if (!force && m_text == text) |
| return; |
| |
| int delta = text.length() - textLength(); |
| unsigned end = len ? offset + len - 1 : offset; |
| |
| m_linesDirty = simpleLineLayout() || m_lineBoxes.dirtyRange(*this, offset, end, delta); |
| |
| setText(text, force || m_linesDirty); |
| } |
| |
| void RenderText::transformText() |
| { |
| String textToTransform = originalText(); |
| if (!textToTransform.isNull()) |
| setText(textToTransform, true); |
| } |
| |
| static inline bool isInlineFlowOrEmptyText(const 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() const |
| { |
| // find previous text renderer if one exists |
| const 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 applyTextTransform(const RenderStyle& style, String& text, UChar previousCharacter) |
| { |
| switch (style.textTransform()) { |
| case TTNONE: |
| break; |
| case CAPITALIZE: |
| makeCapitalized(&text, previousCharacter); |
| break; |
| case UPPERCASE: |
| text = text.upper(style.locale()); |
| break; |
| case LOWERCASE: |
| text = text.lower(style.locale()); |
| break; |
| } |
| } |
| |
| void RenderText::setTextInternal(const String& text) |
| { |
| ASSERT(!text.isNull()); |
| m_text = text; |
| |
| if (m_useBackslashAsYenSymbol) |
| m_text.replace('\\', yenSign); |
| |
| ASSERT(m_text); |
| |
| applyTextTransform(style(), m_text, previousCharacter()); |
| |
| // 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: |
| secureText(whiteBullet); |
| break; |
| case TSDISC: |
| secureText(bullet); |
| break; |
| case TSSQUARE: |
| secureText(blackSquare); |
| } |
| |
| ASSERT(!m_text.isNull()); |
| |
| m_isAllASCII = m_text.containsOnlyASCII(); |
| m_canUseSimpleFontCodePath = computeCanUseSimpleFontCodePath(); |
| } |
| |
| void RenderText::secureText(UChar mask) |
| { |
| if (!textLength()) |
| return; |
| |
| int lastTypedCharacterOffsetToReveal = -1; |
| String revealedText; |
| SecureTextTimer* secureTextTimer = gSecureTextTimers ? gSecureTextTimers->get(this) : 0; |
| if (secureTextTimer && secureTextTimer->isActive()) { |
| lastTypedCharacterOffsetToReveal = secureTextTimer->lastTypedCharacterOffset(); |
| if (lastTypedCharacterOffsetToReveal >= 0) |
| revealedText.append(m_text[lastTypedCharacterOffsetToReveal]); |
| } |
| |
| m_text.fill(mask); |
| if (lastTypedCharacterOffsetToReveal >= 0) { |
| m_text.replace(lastTypedCharacterOffsetToReveal, 1, revealedText); |
| // m_text may be updated later before timer fires. We invalidate the lastTypedCharacterOffset to avoid inconsistency. |
| secureTextTimer->invalidate(); |
| } |
| } |
| |
| void RenderText::setText(const String& text, bool force) |
| { |
| ASSERT(!text.isNull()); |
| |
| if (!force && m_text == text) |
| return; |
| |
| setTextInternal(text); |
| setNeedsLayoutAndPrefWidthsRecalc(); |
| m_knownToHaveNoOverflowAndNoFallbackFonts = false; |
| |
| if (parent()->isRenderBlockFlow()) |
| toRenderBlockFlow(parent())->invalidateLineLayoutPath(); |
| |
| if (AXObjectCache* cache = document().existingAXObjectCache()) |
| cache->textChanged(this); |
| } |
| |
| String RenderText::textWithoutConvertingBackslashToYenSymbol() const |
| { |
| if (!m_useBackslashAsYenSymbol || style().textSecurity() != TSNONE) |
| return text(); |
| |
| String text = originalText(); |
| applyTextTransform(style(), text, previousCharacter()); |
| return text; |
| } |
| |
| void RenderText::dirtyLineBoxes(bool fullLayout) |
| { |
| if (fullLayout) |
| m_lineBoxes.deleteAll(); |
| else if (!m_linesDirty) |
| m_lineBoxes.dirtyAll(); |
| m_linesDirty = false; |
| } |
| |
| InlineTextBox* RenderText::createTextBox() |
| { |
| return new InlineTextBox(*this); |
| } |
| |
| void RenderText::positionLineBox(InlineBox* box) |
| { |
| InlineTextBox* textBox = toInlineTextBox(box); |
| |
| // FIXME: should not be needed!!! |
| if (!textBox->len()) { |
| // We want the box to be destroyed. |
| textBox->removeFromParent(); |
| m_lineBoxes.remove(*textBox); |
| delete textBox; |
| return; |
| } |
| |
| m_containsReversedText |= !textBox->isLeftToRightDirection(); |
| } |
| |
| void RenderText::ensureLineBoxes() |
| { |
| if (!parent()->isRenderBlockFlow()) |
| return; |
| toRenderBlockFlow(parent())->ensureLineBoxes(); |
| } |
| |
| const SimpleLineLayout::Layout* RenderText::simpleLineLayout() const |
| { |
| if (!parent()->isRenderBlockFlow()) |
| return nullptr; |
| return toRenderBlockFlow(parent())->simpleLineLayout(); |
| } |
| |
| float RenderText::width(unsigned from, unsigned len, float xPos, bool firstLine, HashSet<const SimpleFontData*>* fallbackFonts, GlyphOverflow* glyphOverflow) const |
| { |
| if (from >= textLength()) |
| return 0; |
| |
| if (from + len > textLength()) |
| len = textLength() - from; |
| |
| const RenderStyle& lineStyle = firstLine ? firstLineStyle() : style(); |
| return width(from, len, lineStyle.font(), xPos, fallbackFonts, glyphOverflow); |
| } |
| |
| float RenderText::width(unsigned from, unsigned len, const Font& f, float xPos, HashSet<const SimpleFontData*>* fallbackFonts, GlyphOverflow* glyphOverflow) const |
| { |
| ASSERT(from + len <= textLength()); |
| if (!textLength()) |
| return 0; |
| |
| const RenderStyle& style = this->style(); |
| float w; |
| if (&f == &style.font()) { |
| if (!style.preserveNewline() && !from && len == textLength() && (!glyphOverflow || !glyphOverflow->computeBounds)) { |
| if (fallbackFonts) { |
| ASSERT(glyphOverflow); |
| if (preferredLogicalWidthsDirty() || !m_knownToHaveNoOverflowAndNoFallbackFonts) { |
| const_cast<RenderText*>(this)->computePreferredLogicalWidths(0, *fallbackFonts, *glyphOverflow); |
| if (fallbackFonts->isEmpty() && !glyphOverflow->left && !glyphOverflow->right && !glyphOverflow->top && !glyphOverflow->bottom) |
| m_knownToHaveNoOverflowAndNoFallbackFonts = true; |
| } |
| w = m_maxWidth; |
| } else |
| w = maxLogicalWidth(); |
| } else |
| w = widthFromCache(f, from, len, xPos, fallbackFonts, glyphOverflow, style); |
| } else { |
| TextRun run = RenderBlock::constructTextRun(const_cast<RenderText*>(this), f, this, from, len, style); |
| run.setCharactersLength(textLength() - from); |
| ASSERT(run.charactersLength() >= run.length()); |
| |
| run.setCharacterScanForCodePath(!canUseSimpleFontCodePath()); |
| run.setTabSize(!style.collapseWhiteSpace(), style.tabSize()); |
| run.setXPos(xPos); |
| w = f.width(run, fallbackFonts, glyphOverflow); |
| } |
| |
| return w; |
| } |
| |
| IntRect RenderText::linesBoundingBox() const |
| { |
| if (auto layout = simpleLineLayout()) |
| return SimpleLineLayout::computeTextBoundingBox(*this, *layout); |
| |
| return m_lineBoxes.boundingBox(*this); |
| } |
| |
| LayoutRect RenderText::linesVisualOverflowBoundingBox() const |
| { |
| ASSERT(!simpleLineLayout()); |
| return m_lineBoxes.visualOverflowBoundingBox(*this); |
| } |
| |
| LayoutRect RenderText::clippedOverflowRectForRepaint(const RenderLayerModelObject* repaintContainer) const |
| { |
| RenderObject* rendererToRepaint = containingBlock(); |
| |
| // Do not cross self-painting layer boundaries. |
| RenderObject& enclosingLayerRenderer = enclosingLayer()->renderer(); |
| if (&enclosingLayerRenderer != rendererToRepaint && !rendererToRepaint->isDescendantOf(&enclosingLayerRenderer)) |
| rendererToRepaint = &enclosingLayerRenderer; |
| |
| // The renderer we chose to repaint may be an ancestor of repaintContainer, but we need to do a repaintContainer-relative repaint. |
| if (repaintContainer && repaintContainer != rendererToRepaint && !rendererToRepaint->isDescendantOf(repaintContainer)) |
| return repaintContainer->clippedOverflowRectForRepaint(repaintContainer); |
| |
| return rendererToRepaint->clippedOverflowRectForRepaint(repaintContainer); |
| } |
| |
| LayoutRect RenderText::selectionRectForRepaint(const RenderLayerModelObject* repaintContainer, bool clipToVisibleContent) |
| { |
| ASSERT(!needsLayout()); |
| ASSERT(!simpleLineLayout()); |
| |
| if (selectionState() == SelectionNone) |
| return LayoutRect(); |
| RenderBlock* cb = containingBlock(); |
| if (!cb) |
| return LayoutRect(); |
| |
| // 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(); |
| |
| LayoutRect rect = m_lineBoxes.selectionRectForRange(startPos, endPos); |
| |
| if (clipToVisibleContent) |
| computeRectForRepaint(repaintContainer, rect); |
| else { |
| if (cb->hasColumns()) |
| cb->adjustRectForColumns(rect); |
| |
| rect = localToContainerQuad(FloatRect(rect), repaintContainer).enclosingBoundingBox(); |
| } |
| |
| return rect; |
| } |
| |
| int RenderText::caretMinOffset() const |
| { |
| if (auto layout = simpleLineLayout()) |
| return SimpleLineLayout::findTextCaretMinimumOffset(*this, *layout); |
| return m_lineBoxes.caretMinOffset(); |
| } |
| |
| int RenderText::caretMaxOffset() const |
| { |
| if (auto layout = simpleLineLayout()) |
| return SimpleLineLayout::findTextCaretMaximumOffset(*this, *layout); |
| return m_lineBoxes.caretMaxOffset(*this); |
| } |
| |
| unsigned RenderText::countRenderedCharacterOffsetsUntil(unsigned offset) const |
| { |
| ASSERT(!simpleLineLayout()); |
| return m_lineBoxes.countCharacterOffsetsUntil(offset); |
| } |
| |
| bool RenderText::containsRenderedCharacterOffset(unsigned offset) const |
| { |
| ASSERT(!simpleLineLayout()); |
| return m_lineBoxes.containsOffset(*this, offset, RenderTextLineBoxes::CharacterOffset); |
| } |
| |
| bool RenderText::containsCaretOffset(unsigned offset) const |
| { |
| if (auto layout = simpleLineLayout()) |
| return SimpleLineLayout::containsTextCaretOffset(*this, *layout, offset); |
| return m_lineBoxes.containsOffset(*this, offset, RenderTextLineBoxes::CaretOffset); |
| } |
| |
| bool RenderText::hasRenderedText() const |
| { |
| if (auto layout = simpleLineLayout()) |
| return SimpleLineLayout::isTextRendered(*this, *layout); |
| return m_lineBoxes.hasRenderedText(); |
| } |
| |
| int RenderText::previousOffset(int current) const |
| { |
| if (isAllASCII() || m_text.is8Bit()) |
| return current - 1; |
| |
| StringImpl* textImpl = m_text.impl(); |
| TextBreakIterator* iterator = cursorMovementIterator(textImpl->characters16(), textImpl->length()); |
| if (!iterator) |
| return current - 1; |
| |
| long result = textBreakPreceding(iterator, current); |
| if (result == TextBreakDone) |
| result = current - 1; |
| |
| |
| return result; |
| } |
| |
| #if PLATFORM(MAC) || PLATFORM(EFL) |
| |
| #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; |
| } |
| |
| inline bool isMark(UChar32 c) |
| { |
| int8_t charType = u_charType(c); |
| return charType == U_NON_SPACING_MARK || charType == U_ENCLOSING_MARK || charType == U_COMBINING_SPACING_MARK; |
| } |
| |
| inline bool isRegionalIndicator(UChar32 c) |
| { |
| // National flag emoji each consists of a pair of regional indicator symbols. |
| return 0x1F1E6 <= c && c <= 0x1F1FF; |
| } |
| |
| #endif |
| |
| int RenderText::previousOffsetForBackwardDeletion(int current) const |
| { |
| #if PLATFORM(MAC) || PLATFORM(EFL) |
| ASSERT(m_text); |
| StringImpl& text = *m_text.impl(); |
| UChar32 character; |
| bool sawRegionalIndicator = false; |
| while (current > 0) { |
| if (U16_IS_TRAIL(text[--current])) |
| --current; |
| if (current < 0) |
| break; |
| |
| UChar32 character = text.characterStartingAt(current); |
| |
| if (sawRegionalIndicator) { |
| // We don't check if the pair of regional indicator symbols before current position can actually be combined |
| // into a flag, and just delete it. This may not agree with how the pair is rendered in edge cases, |
| // but is good enough in practice. |
| if (isRegionalIndicator(character)) |
| break; |
| // Don't delete a preceding character that isn't a regional indicator symbol. |
| U16_FWD_1_UNSAFE(text, current); |
| } |
| |
| // We don't combine characters in Armenian ... Limbu range for backward deletion. |
| if ((character >= 0x0530) && (character < 0x1950)) |
| break; |
| |
| if (isRegionalIndicator(character)) { |
| sawRegionalIndicator = true; |
| continue; |
| } |
| |
| if (!isMark(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; |
| |
| 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; |
| |
| 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. |
| if (U16_IS_TRAIL(m_text[--current])) |
| --current; |
| if (current < 0) |
| current = 0; |
| return current; |
| #endif |
| } |
| |
| int RenderText::nextOffset(int current) const |
| { |
| if (isAllASCII() || m_text.is8Bit()) |
| return current + 1; |
| |
| StringImpl* textImpl = m_text.impl(); |
| TextBreakIterator* iterator = cursorMovementIterator(textImpl->characters16(), textImpl->length()); |
| if (!iterator) |
| return current + 1; |
| |
| long result = textBreakFollowing(iterator, current); |
| if (result == TextBreakDone) |
| result = current + 1; |
| |
| return result; |
| } |
| |
| bool RenderText::computeCanUseSimpleFontCodePath() const |
| { |
| if (isAllASCII() || m_text.is8Bit()) |
| return true; |
| return Font::characterRangeCodePath(characters(), length()) == Font::Simple; |
| } |
| |
| void RenderText::momentarilyRevealLastTypedCharacter(unsigned lastTypedCharacterOffset) |
| { |
| if (!gSecureTextTimers) |
| gSecureTextTimers = new SecureTextTimerMap; |
| |
| SecureTextTimer* secureTextTimer = gSecureTextTimers->get(this); |
| if (!secureTextTimer) { |
| secureTextTimer = new SecureTextTimer(this); |
| gSecureTextTimers->add(this, secureTextTimer); |
| } |
| secureTextTimer->restartWithNewText(lastTypedCharacterOffset); |
| } |
| |
| } // namespace WebCore |
