Method calcLength

Bcore/src/main/cpp/Dobby/tests/catch.hpp:5113–5138

    }

    void calcLength() {
      assert(m_stringIndex < m_column.m_strings.size());

      m_suffix   = false;
      auto width = m_column.m_width - indent();
      m_end      = m_pos;
      while (m_end < line().size() && line()[m_end] != '\n')
        ++m_end;

      if (m_end < m_pos + width) {
        m_len = m_end - m_pos;
      } else {
        size_t len = width;
        while (len > 0 && !isBoundary(m_pos + len))
          --len;
        while (len > 0 && isWhitespace(line()[m_pos + len - 1]))
          --len;

        if (len > 0) {
          m_len = len;
        } else {
          m_suffix = true;
          m_len    = width - 1;
        }
      }
    }

    auto indent() const -> size_t {
      auto initial = m_pos == 0 && m_stringIndex == 0 ? m_column.m_initialIndent : std::string::npos;