filterbase.hpp

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/************************************************************************
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under the terms of the GNU General Public License as published by
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************************************************************************/

#ifndef _Wolframe_FILTER_FILTERBASE_HPP_INCLUDED
#define _Wolframe_FILTER_FILTERBASE_HPP_INCLUDED
#include <string>
#include <cstring>

namespace _Wolframe {
namespace langbind {

class FilterBase
{
public:
        explicit FilterBase( const char* name_)
                :m_flags(None)
                ,m_name(name_)
        {
                m_errorbuf[0] = '\0';
        }

        FilterBase( const FilterBase& o)
                :m_flags(o.m_flags)
                ,m_name(o.m_name)
        {
                setError( o.m_errorbuf);
        }

        virtual ~FilterBase(){}

        enum ElementType
        {
                OpenTag,        
                Attribute,      
                Value,          
                CloseTag        
        };
        static const char* elementTypeName( ElementType i)
        {
                static const char* ar[] = {"OpenTag","Attribute","Value","CloseTag"};
                return ar[(int)i];
        }

        virtual const char* getError() const
        {
                return m_errorbuf[0]?m_errorbuf:0;
        }

        void setError( const char* msg=0)
        {
                if (msg)
                {
                        std::size_t msglen = std::strlen( msg);
                        if (msglen >= ErrorBufSize) msglen = (std::size_t)ErrorBufSize-1;
                        std::memcpy( m_errorbuf, msg, msglen);
                        m_errorbuf[ msglen] = 0;
                }
                else
                {
                        m_errorbuf[ 0] = 0;
                }
        }

        enum Flags
        {
                None=0x00,                              
                SerializeWithIndices=0x01,              
                PropagateNoCase=0x02,                   
                PropagateNoAttr=0x04                    
        };

        bool flag( Flags f) const                       {return ((int)f & (int)m_flags) == (int)f;}

        Flags flags() const                             {return m_flags;}

        virtual bool setFlags( Flags f)                 {int ff=(int)m_flags | (int)f; m_flags=(Flags)ff; return true;}
        virtual bool checkSetFlags( Flags) const        {return true;}

        const char* name() const                        {return m_name;}

private:
        enum {ErrorBufSize=128};                
        char m_errorbuf[ ErrorBufSize];         
        Flags m_flags;                          
        const char* m_name;                     
};

class ContentFilterBase
        :public FilterBase
{
public:
        ContentFilterBase( const char* name_)
                :FilterBase( name_){}
        ContentFilterBase( const ContentFilterBase& o)
                :FilterBase( o){}

        virtual bool getValue( const char* /*name*/, std::string& /*val*/) const
        {
                return false;
        }

        virtual bool setValue( const char* /*name*/, const std::string& /*val*/)
        {
                return false;
        }
};

}}//namespace
#endif