errorstack.hh

#ifndef ERRORSTACK_HH
#define ERRORSTACK_HH
 
#include <QList>
#include <QString>
#include <QTextStream>

class ErrorStack
{
public:
  class Stack;

  class Message
  {
  public:
    Message();
    Message(const QString &file, unsigned line, const QString &message);

    const QString &file() const;
    unsigned line() const;
    const QString &message() const;
    QString format() const;
 
  protected:
    QString _file;
    unsigned _line;
    QString _message;
  };

  class MessageStream: public QTextStream
  {
  public:
    MessageStream(const ErrorStack &stack, const QString &file, unsigned line);
    virtual ~MessageStream();
 
  protected:
    const ErrorStack &_stack;
    QString _file;
    unsigned _line;
    QString _message;
  };

  class Stack
  {
  public:
    Stack() noexcept;
 
  public:
    bool isEmpty() const;
    unsigned count() const;
    const Message &message(unsigned i) const;
    QString format(const QString &indent="  ") const;

    void push(const Message &msg);
    void push(const Stack &other);

    void clear();

    Stack *ref();
    void unref();
 
  private:
    unsigned _refcount;
    QList<Message> _errorMessageStack;
  };
 
public:
  ErrorStack() noexcept;
  ErrorStack(const ErrorStack &other);
  ~ErrorStack();

  ErrorStack &operator= (const ErrorStack &other);

  bool isEmpty() const;
  unsigned count() const;
  const Message &message(unsigned i) const;

  void push(const Message &msg) const;
  void take(const ErrorStack &other) const;
  QString format(const QString &indent="  ") const;
 
protected:
  Stack *_stack;
};
 

#define errMsg(stack) (ErrorStack::MessageStream(stack, __FILE__, __LINE__))
 
#endif // ERRORSTACK_HH