| /* |
| * Copyright (C) 2018 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
| * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS |
| * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF |
| * THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| #include "InlineTextItem.h" |
| |
| #if ENABLE(LAYOUT_FORMATTING_CONTEXT) |
| |
| #include "BreakLines.h" |
| |
| namespace WebCore { |
| namespace Layout { |
| |
| static inline bool isWhitespaceCharacter(char character, bool preserveNewline) |
| { |
| return character == ' ' || character == '\t' || (character == '\n' && !preserveNewline); |
| } |
| |
| static inline bool isSoftLineBreak(char character, bool preserveNewline) |
| { |
| return preserveNewline && character == '\n'; |
| } |
| |
| static unsigned moveToNextNonWhitespacePosition(String textContent, unsigned startPosition, bool preserveNewline) |
| { |
| auto nextNonWhiteSpacePosition = startPosition; |
| while (nextNonWhiteSpacePosition < textContent.length() && isWhitespaceCharacter(textContent[nextNonWhiteSpacePosition], preserveNewline)) |
| ++nextNonWhiteSpacePosition; |
| return nextNonWhiteSpacePosition - startPosition; |
| } |
| |
| static unsigned moveToNextBreakablePosition(unsigned startPosition, LazyLineBreakIterator lineBreakIterator, const RenderStyle& style) |
| { |
| auto findNextBreakablePosition = [&](auto startPosition) { |
| auto keepAllWordsForCJK = style.wordBreak() == WordBreak::KeepAll; |
| auto breakNBSP = style.autoWrap() && style.nbspMode() == NBSPMode::Space; |
| |
| if (keepAllWordsForCJK) { |
| if (breakNBSP) |
| return nextBreakablePositionKeepingAllWords(lineBreakIterator, startPosition); |
| return nextBreakablePositionKeepingAllWordsIgnoringNBSP(lineBreakIterator, startPosition); |
| } |
| |
| if (lineBreakIterator.mode() == LineBreakIteratorMode::Default) { |
| if (breakNBSP) |
| return WebCore::nextBreakablePosition(lineBreakIterator, startPosition); |
| return nextBreakablePositionIgnoringNBSP(lineBreakIterator, startPosition); |
| } |
| |
| if (breakNBSP) |
| return nextBreakablePositionWithoutShortcut(lineBreakIterator, startPosition); |
| return nextBreakablePositionIgnoringNBSPWithoutShortcut(lineBreakIterator, startPosition); |
| }; |
| |
| auto textLength = lineBreakIterator.stringView().length(); |
| auto currentPosition = startPosition; |
| while (currentPosition < textLength - 1) { |
| auto nextBreakablePosition = findNextBreakablePosition(currentPosition); |
| if (nextBreakablePosition != currentPosition) |
| return nextBreakablePosition - currentPosition; |
| ++currentPosition; |
| } |
| return textLength - startPosition; |
| } |
| |
| void InlineTextItem::createAndAppendTextItems(InlineItems& inlineContent, const Box& inlineBox) |
| { |
| auto text = inlineBox.textContent(); |
| if (!text.length()) |
| return inlineContent.append(makeUnique<InlineTextItem>(inlineBox, 0, 0, false, false)); |
| |
| auto& style = inlineBox.style(); |
| auto preserveNewline = style.preserveNewline(); |
| auto collapseWhiteSpace = style.collapseWhiteSpace(); |
| LazyLineBreakIterator lineBreakIterator(text); |
| unsigned currentPosition = 0; |
| while (currentPosition < text.length()) { |
| // Soft linebreak? |
| if (isSoftLineBreak(text[currentPosition], preserveNewline)) { |
| inlineContent.append(makeUnique<InlineTextItem>(inlineBox, currentPosition, 1, true, false)); |
| ++currentPosition; |
| continue; |
| } |
| if (isWhitespaceCharacter(text[currentPosition], preserveNewline)) { |
| auto length = moveToNextNonWhitespacePosition(text, currentPosition, preserveNewline); |
| auto isCollapsed = collapseWhiteSpace && length > 1; |
| inlineContent.append(makeUnique<InlineTextItem>(inlineBox, currentPosition, length, true, isCollapsed)); |
| currentPosition += length; |
| continue; |
| } |
| |
| auto length = moveToNextBreakablePosition(currentPosition, lineBreakIterator, style); |
| inlineContent.append(makeUnique<InlineTextItem>(inlineBox, currentPosition, length, false, false)); |
| currentPosition += length; |
| } |
| } |
| |
| InlineTextItem::InlineTextItem(const Box& inlineBox, unsigned start, unsigned length, bool isWhitespace, bool isCollapsed) |
| : InlineItem(inlineBox, Type::Text) |
| , m_start(start) |
| , m_length(length) |
| , m_isWhitespace(isWhitespace) |
| , m_isCollapsed(isCollapsed) |
| { |
| } |
| |
| std::unique_ptr<InlineTextItem> InlineTextItem::split(unsigned splitPosition, unsigned length) const |
| { |
| RELEASE_ASSERT(splitPosition >= this->start()); |
| RELEASE_ASSERT(splitPosition + length <= end()); |
| return makeUnique<InlineTextItem>(layoutBox(), splitPosition, length, isWhitespace(), isCollapsed()); |
| } |
| |
| } |
| } |
| #endif |