Class BBCodeMap

src/bbcode.cpp:30–263

namespace log = MOBase::log;

class BBCodeMap
{

  typedef std::map<QString, std::pair<QRegularExpression, QString>> TagMap;

public:
  static BBCodeMap& instance()
  {
    static BBCodeMap s_Instance;
    return s_Instance;
  }

  QString convertTag(QString input, int& length)
  {
    // extract the tag name
    auto match      = m_TagNameExp.match(input, 1, QRegularExpression::NormalMatch,
                                         QRegularExpression::AnchoredMatchOption);
    QString tagName = match.captured(0).toLower();
    TagMap::iterator tagIter = m_TagMap.find(tagName);
    if (tagIter != m_TagMap.end()) {
      // recognized tag
      if (tagName.endsWith('=')) {
        tagName.chop(1);
      }

      int closeTagPos        = 0;
      int nextTagPos         = 0;
      int nextTagSearchIndex = input.indexOf("]");
      int closeTagLength     = 0;
      if (tagName == "*") {
        // ends at the next bullet point
        closeTagPos =
            input.indexOf(QRegularExpression("(\\[\\*\\]|</ul>)",
                                             QRegularExpression::CaseInsensitiveOption),
                          3);
        // leave closeTagLength at 0 because we don't want to "eat" the next bullet
        // point
      } else if (tagName == "line") {
        // ends immediately after the tag
        closeTagPos = 6;
        // leave closeTagLength at 0 because there is no close tag to skip over
      } else {
        QRegularExpression nextTag(QString("\\[%1[=\\]]?").arg(tagName),
                                   QRegularExpression::CaseInsensitiveOption);
        QString closeTag = QString("[/%1]").arg(tagName);
        closeTagPos      = input.indexOf(closeTag, 0, Qt::CaseInsensitive);
        nextTagPos       = nextTag.match(input, nextTagSearchIndex).capturedStart(0);
        while (nextTagPos != -1 && closeTagPos != -1 && nextTagPos < closeTagPos) {
          closeTagPos        = input.indexOf(closeTag, closeTagPos + closeTag.size(),
                                             Qt::CaseInsensitive);
          nextTagSearchIndex = input.indexOf("]", nextTagPos);
          nextTagPos = nextTag.match(input, nextTagSearchIndex).capturedStart(0);
        }
        if (closeTagPos == -1) {
          // workaround to improve compatibility: add fake closing tag
          input.append(closeTag);
          closeTagPos = input.size() - closeTag.size();
        }