JComment.hh

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#ifndef __JEEP__JCOMMENT__
#define __JEEP__JCOMMENT__
 
#include <istream>
#include <ostream>
#include <sstream>
#include <string>
#include <vector>
 
#include "JLang/JUUID.hh"
#include "JLang/JException.hh"
 
#include "Jeep/JPrint.hh"
 
 
/**
 * \author mdejong
 */
 
namespace JEEP {}
namespace JPP { using namespace JEEP; }
 
namespace JEEP {
  
  using JLANG::JUUID;
  using JLANG::JNoValue;
                       
  /**
   * Type definition of comment block.
   */
  typedef std::vector<std::string>  JComment_t;
 
 
  /**
   * Auxiliary class for comment.
   *
   * A comment starts with a JComment::START_COMMENT and ends with a JComment::CLOSE_COMMENT.\n
   * The text between the quotes JComment::QUOTE is considered as one block which may cross newlines, etc.\n
   * The comments are appended.
   */
  struct JComment :
    public JComment_t
  {
    enum {
      UUID_t = 0                                 //!< index of UUID
    };
 
    static constexpr char START_COMMENT  =  '#';     //!< start comment
    static constexpr char CLOSE_COMMENT  = '\n';     //!< close comment
    static constexpr char START_SPECIAL  =  '$';     //!< start special comment
    static constexpr char CLOSE_SPECIAL  =  '$';     //!< close special comment
    static constexpr char QUOTE          =  '"';     //!< quote
 
 
    /**
     * Default constructor.
     */
    JComment()
    {}
 
 
    /**
     * Update this comment with given UUID.
     *
     * \param  uuid       UUID
     * \return            this comment
     */
    JComment& update(const JUUID& uuid)
    {
      if (!this->hasUUID()) {
        if ((int) this->size() <= UUID_t)
          this->resize(UUID_t + 1);
        else
          this->insert(this->begin() + UUID_t, value_type());
      }
 
      (*this)[UUID_t] = MAKE_STRING(START_SPECIAL << uuid << CLOSE_SPECIAL);
 
      return *this; 
    }
 
 
    /**
     * Update this comment with random UUID.
     *
     * \return            this comment
     */
    JComment& update()
    {
      return this->update(JUUID::rndm());
    }
 
 
    /**
     * Add comment.
     *
     * \param  comment    comment
     * \return            this comment
     */
    JComment& add(const std::string& comment)
    {
      this->push_back(comment);
 
      return this->update();
    }
 
 
    /**
     * Add comment block.
     *
     * \param  comment    comment block
     * \return            this comment
     */
    JComment& add(const JComment_t& comment)
    {
      for (const_iterator i = comment.begin(); i != comment.end(); ++i) {
        this->push_back(*i);
      }
 
      return this->update();
    }
 
 
    /**
     * Check if this comment has UUID.
     *
     * \return            true if UUID present; else false
     */
    bool hasUUID() const
    {
      return (UUID_t < (int) this->size() && is_special((*this)[UUID_t]));
    }
 
 
    /**
     * Get UUID.
     *
     * \return            UUID
     */
    JUUID getUUID() const
    {
      if (this->hasUUID()) {
 
        const std::string& buffer = (*this)[UUID_t];
 
        return JUUID::valueOf(buffer.substr(1, buffer.size() - 2));
 
      } else {
 
        THROW(JNoValue, "No UUID in comment.");
      }
    }
 
 
    /**
     * Read comment from input.
     *
     * \param  in         input stream
     * \param  comment    comment
     * \return            input stream
     */
    friend inline std::istream& operator>>(std::istream& in, JComment& comment)
    {
      using namespace std;
 
      while (in.peek() == (int) START_COMMENT) {
 
        in.get();
 
        if (in.peek() == (int) ' ') {
          in.get();
        }
 
        int    c;
        string buffer;
 
        while ((c = in.get()) != EOF && c != (int) CLOSE_COMMENT) {
 
          buffer.push_back((char) c);
 
          if (c == (int) QUOTE) {
 
            while ((c = in.get()) != EOF && c != (int) QUOTE) {
              buffer.push_back((char) c);
            }
 
            buffer.push_back(QUOTE);
          }
        }
 
        comment.push_back(buffer);
      }
 
      return in;
    }
 
 
    /**
     * Write comment to output.
     *
     * \param  out        output stream
     * \param  comment    comment
     * \return            output stream
     */
    friend inline std::ostream& operator<<(std::ostream& out, const JComment& comment)
    {
      using namespace std;
 
      for (JComment::const_iterator i = comment.begin(); i != comment.end(); ++i) {
        out << START_COMMENT << ' ' << *i << CLOSE_COMMENT;
      }
 
      return out << flush;
    }
 
 
    /**
     * Check if given string is special.
     *
     * \param  buffer     input string
     * \return            true if special; else false
     */
    static bool is_special(const std::string& buffer)
    {
      const int N = buffer.size();
 
      return (N            >   2               &&
              buffer[0]    ==  START_SPECIAL   &&
              buffer[N-1]  ==  CLOSE_SPECIAL);        
    }
  };
}
 
#endif