text: /****************************************************************************
   Copyright (c) 2013      Zynga Inc.
   Copyright (c) 2013-2014 Chukong Technologies Inc.
   
   http://www.cocos2d-x.org
   
   Permission is hereby granted, free of charge, to any person obtaining a copy
   of this software and associated documentation files (the "Software"), to deal
   in the Software without restriction, including without limitation the rights
   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   copies of the Software, and to permit persons to whom the Software is
   furnished to do so, subject to the following conditions:
   
   The above copyright notice and this permission notice shall be included in
   all copies or substantial portions of the Software.
   
   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
   THE SOFTWARE.
   ****************************************************************************/
  
  #include "2d/CCLabelTextFormatter.h"
  
  #include <vector>
  
  #include "base/ccUTF8.h"
  #include "base/CCDirector.h"
  #include "2d/CCLabel.h"
  
  NS_CC_BEGIN
  
  bool LabelTextFormatter::multilineText(Label *theLabel)
  {
      auto limit = theLabel->_limitShowCount;
      auto strWhole = theLabel->_currentUTF16String;
  
      std::vector<char16_t> multiline_string;
      multiline_string.reserve( limit );
  
      std::vector<char16_t> last_word;
      last_word.reserve( 25 );
  
      bool   isStartOfLine  = false, isStartOfWord = false;
      float  startOfLine = -1, startOfWord   = -1;
  
      int skip = 0;
      
      int tIndex = 0;
      float scalsX = theLabel->getScaleX();
      float lineWidth = theLabel->_maxLineWidth;
      bool breakLineWithoutSpace = theLabel->_lineBreakWithoutSpaces;
      Label::LetterInfo* info = nullptr;
  
      for (int j = 0; j+skip < limit; j++)
      {            
          info = & theLabel->_lettersInfo.at(j+skip);
  
          unsigned int justSkipped = 0;
  
          while (info->def.validDefinition == false)
          {
              justSkipped++;
              tIndex = j+skip+justSkipped;
              if (strWhole[tIndex-1] == '\n')
              {
                  StringUtils::trimUTF16Vector(last_word);
  
                  last_word.push_back('\n');
                  multiline_string.insert(multiline_string.end(), last_word.begin(), last_word.end());
                  last_word.clear();
                  isStartOfWord = false;
                  isStartOfLine = false;
                  startOfWord = -1;
                  startOfLine = -1;
              }
              if(tIndex < limit)
              {
                  info = & theLabel->_lettersInfo.at( tIndex );
              }
              else
                  break;
          }
          skip += justSkipped;
          tIndex = j + skip;
  
          if (tIndex >= limit)
              break;
  
          char16_t character = strWhole[tIndex];
  
          if (!isStartOfWord)
          {
              startOfWord = info->position.x * scalsX;
              isStartOfWord = true;
          }
  
          if (!isStartOfLine)
          {
              startOfLine = startOfWord;
              isStartOfLine  = true;
          }
          
          // 1) Whitespace.
          // 2) This character is non-CJK, but the last character is CJK
          bool isspace = StringUtils::isUnicodeSpace(character);
          bool isCJK = false;
          if(!isspace)
          {
              isCJK = StringUtils::isCJKUnicode(character);
          }
  
          if (isspace ||
              (!last_word.empty() && StringUtils::isCJKUnicode(last_word.back()) && !isCJK))
          {
              // if current character is white space, put it into the current word
              if (isspace) last_word.push_back(character);
              multiline_string.insert(multiline_string.end(), last_word.begin(), last_word.end());
              last_word.clear();
              isStartOfWord = false;
              startOfWord = -1;
              // put the CJK character in the last word
              // and put the non-CJK(ASCII) character in the current word
              if (!isspace) last_word.push_back(character);
              continue;
          }
          
          float posRight = (info->position.x + info->contentSize.width) * scalsX;
          // Out of bounds.
          if (posRight - startOfLine > lineWidth)
          {
              if (!breakLineWithoutSpace && !isCJK)
              {
                  last_word.push_back(character);
                  
                  int found = StringUtils::getIndexOfLastNotChar16(multiline_string, ' ');
                  if (found != -1)
                      StringUtils::trimUTF16Vector(multiline_string);
                  else
                      multiline_string.clear();
  
                  if (multiline_string.size() > 0)
                      multiline_string.push_back('\n');
  
                  isStartOfLine = false;
                  startOfLine = -1;
              }
              else
              {
                  StringUtils::trimUTF16Vector(last_word);
                  //issue #8492:endless loop if not using system font, and constrained length is less than one character width
                  if (isStartOfLine && last_word.size() == 0)
                      last_word.push_back(character);
                  else
                      --j;
  
                  last_word.push_back('\n');
                  multiline_string.insert(multiline_string.end(), last_word.begin(), last_word.end());
                  last_word.clear();
                  
                  isStartOfWord = false;
                  isStartOfLine = false;
                  startOfWord = -1;
                  startOfLine = -1;
              }
          }
          else
          {
              // Character is normal.
              last_word.push_back(character);
          }
      }
  
      multiline_string.insert(multiline_string.end(), last_word.begin(), last_word.end());
  
      std::u16string strNew(multiline_string.begin(), multiline_string.end());
      
      theLabel->_currentUTF16String = strNew;
      theLabel->computeStringNumLines();
      theLabel->computeHorizontalKernings(theLabel->_currentUTF16String);
  
      return true;
  }
  
  bool LabelTextFormatter::alignText(Label *theLabel)
  {
      int i = 0;
      
      int lineNumber = 0;
      int strLen = theLabel->_limitShowCount;
      std::vector<char16_t> lastLine;
      auto strWhole = theLabel->_currentUTF16String;
  
      if (theLabel->_labelWidth > theLabel->_contentSize.width)
      {
          theLabel->setContentSize(Size(theLabel->_labelWidth,theLabel->_contentSize.height));
      }
  
      for (int ctr = 0; ctr <= strLen; ++ctr)
      { 
          char16_t currentChar = strWhole[ctr];
  
          if (currentChar == '\n' || currentChar == 0)
          {
              auto lineLength = lastLine.size();
              
              // if last line is empty we must just increase lineNumber and work with next line
              if (lineLength == 0)
              {
                  lineNumber++;
                  continue;
              }
              int index = static_cast<int>(i + lineLength - 1 + lineNumber);
              if (index < 0) continue;
              
              auto info = & theLabel->_lettersInfo.at( index );
              if(info->def.validDefinition == false)
                  continue;
              
              float shift = 0;
              switch (theLabel->_hAlignment)
              {
                  case TextHAlignment::CENTER:
                      {
                          float lineWidth = info->position.x + info->contentSize.width;
                          shift = theLabel->_contentSize.width/2.0f - lineWidth/2.0f;
                          break;
                      }
                  case TextHAlignment::RIGHT:
                      {
                          float lineWidth = info->position.x + info->contentSize.width;
                          shift = theLabel->_contentSize.width - lineWidth;
                          break;
                      }
                  default:
                      break;
              }
              
              if (shift != 0)
              {
                  for (unsigned j = 0; j < lineLength; ++j)
                  {
                      index = i + j + lineNumber;
                      if (index < 0) continue;
                      
                      info = & theLabel->_lettersInfo.at( index );
                      if(info)
                      {
                          info->position.x += shift;
                      }
                  }
              }
              
              i += lineLength;
              ++lineNumber;
              
              lastLine.clear();
              continue;
          }
          
          lastLine.push_back(currentChar);
      }
      
      return true;
  }
  
  bool LabelTextFormatter::createStringSprites(Label *theLabel)
  {
      theLabel->_limitShowCount = 0;
      // check for string
      int stringLen = theLabel->getStringLength();
      if (stringLen <= 0)
          return false;
      
      auto totalHeight = theLabel->_commonLineHeight * theLabel->_currNumLines;
      auto longestLine = 0.0f;
      auto nextFontPositionX = 0.0f;
      auto nextFontPositionY = totalHeight;
      auto contentScaleFactor = CC_CONTENT_SCALE_FACTOR();
  
      if (theLabel->_labelHeight > 0)
      {
          auto labelHeightPixel = theLabel->_labelHeight * contentScaleFactor;
          if (totalHeight > labelHeightPixel)
          {
              int numLines = labelHeightPixel / theLabel->_commonLineHeight;
              totalHeight = numLines * theLabel->_commonLineHeight;
          }
          switch (theLabel->_vAlignment)
          {
          case TextVAlignment::TOP:
              nextFontPositionY = labelHeightPixel;
              break;
          case TextVAlignment::CENTER:
              nextFontPositionY = (labelHeightPixel + totalHeight) / 2.0f;
              break;
          case TextVAlignment::BOTTOM:
              nextFontPositionY = totalHeight;
              break;
          default:
              break;
          }
      }
      
      int charXOffset = 0;
      int charYOffset = 0;
      int charAdvance = 0;
  
      auto strWhole = theLabel->_currentUTF16String;
      auto fontAtlas = theLabel->_fontAtlas;
      FontLetterDefinition tempDefinition;
      Vec2 letterPosition;
      const auto& kernings = theLabel->_horizontalKernings;
      CCASSERT(kernings, "kernings must's be nullptr!!!");
  
      float clipTop = 0;
      float clipBottom = 0;
      int lineIndex = 0;
      bool lineStart = true;
      bool clipBlank = false;
      if (theLabel->_currentLabelType == Label::LabelType::TTF && theLabel->_clipEnabled)
      {
          clipBlank = true;
      }
      
      for (int i = 0; i < stringLen; i++)
      {
          char16_t c    = strWhole[i];
          if (fontAtlas->getLetterDefinitionForChar(c, tempDefinition))
          {
              charXOffset         = tempDefinition.offsetX;
              charYOffset         = tempDefinition.offsetY;
              charAdvance         = tempDefinition.xAdvance;
          }
          else
          {
              charXOffset         = -1;
              charYOffset         = -1;
              charAdvance         = -1;
          }
  
          if (c == '\n')
          {
              lineIndex++;
              nextFontPositionX  = 0;
              nextFontPositionY -= theLabel->_commonLineHeight;
              
              theLabel->recordPlaceholderInfo(i);
              if(nextFontPositionY < theLabel->_commonLineHeight)
                  break;
  
              lineStart = true;
              continue;     
          }
          else if (clipBlank && tempDefinition.height > 0.0f)
          {
              if (lineStart)
              {
                  if (lineIndex == 0)
                  {
                      clipTop = charYOffset;
                  }
                  lineStart = false;
                  clipBottom = tempDefinition.clipBottom;
              }
              else if(tempDefinition.clipBottom < clipBottom)
              {
                  clipBottom = tempDefinition.clipBottom;
              }
  
              if (lineIndex == 0 && charYOffset < clipTop)
              {
                  clipTop = charYOffset;
              }
          }
          
          letterPosition.x = (nextFontPositionX + charXOffset + kernings[i]) / contentScaleFactor;
          letterPosition.y = (nextFontPositionY - charYOffset) / contentScaleFactor;
                 
          if( theLabel->recordLetterInfo(letterPosition, tempDefinition, i) == false)
          {
              log("WARNING: can't find letter definition in font file for letter: %c", c);
              continue;
          }
          
          nextFontPositionX += charAdvance + kernings[i];
          
          if (longestLine < nextFontPositionX)
          {
              longestLine = nextFontPositionX;
          }
          
          // check longest line before adding additional kerning
          nextFontPositionX += theLabel->_additionalKerning;
      }
      
      float lastCharWidth = tempDefinition.width * contentScaleFactor;
      Size tmpSize;
      // If the last character processed has an xAdvance which is less that the width of the characters image, then we need
      // to adjust the width of the string to take this into account, or the character will overlap the end of the bounding
      // box
      if(charAdvance < lastCharWidth)
      {
          tmpSize.width = longestLine - charAdvance + lastCharWidth;
      }
      else
      {
          tmpSize.width = longestLine;
      }
      
      tmpSize.height = totalHeight;
      
      if (theLabel->_labelHeight > 0)
      {
          tmpSize.height = theLabel->_labelHeight * contentScaleFactor;
      }
  
      if (clipBlank)
      {
          int clipTotal = (clipTop + clipBottom) / contentScaleFactor;
          tmpSize.height -= clipTotal * contentScaleFactor;
          clipBottom /= contentScaleFactor;
  
          for (int i = 0; i < theLabel->_limitShowCount; i++)
          {
              theLabel->_lettersInfo[i].position.y -= clipBottom;
          }
      }
      
      theLabel->setContentSize(CC_SIZE_PIXELS_TO_POINTS(tmpSize));
  
      return true;
  }
  
  NS_CC_END
  