foobar2000/helpers/meta_table_builder.h

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class __meta_table_enum_wrapper {
public:
        __meta_table_enum_wrapper(file_info & p_info) : m_info(p_info) {}
        void operator() (const char * p_name,const pfc::chain_list_t<pfc::string8> & p_values) {
                t_size index = infinite;
                for(pfc::chain_list_t<pfc::string8>::const_iterator iter = p_values.first(); iter.is_valid(); ++iter) {
                        if (index == infinite) index = m_info.__meta_add_unsafe(p_name,*iter);
                        else m_info.meta_add_value(index,*iter);
                }
        }
private:
        file_info & m_info;
};

class meta_table_builder {
public:
        void add(const char * p_name,const char * p_value,t_size p_value_len = infinite) {
                if (file_info::g_is_valid_field_name(p_name)) {
                        __add(p_name).insert_last()->set_string(p_value,p_value_len);
                }
        }

        void remove(const char * p_name) {
                m_data.remove(p_name);
        }
        void set(const char * p_name,const char * p_value,t_size p_value_len = infinite) {
                if (file_info::g_is_valid_field_name(p_name)) {
                        t_entry & entry = __add(p_name);
                        entry.remove_all();
                        entry.insert_last()->set_string(p_value,p_value_len);
                }
        }
        pfc::chain_list_t<pfc::string8> & add(const char * p_name) {
                if (!file_info::g_is_valid_field_name(p_name)) throw pfc::exception_bug_check();//we return a reference, nothing smarter to do
                return __add(p_name);
        }
        void finalize(file_info & p_info) {
                p_info.meta_remove_all();
                m_data.enumerate(__meta_table_enum_wrapper(p_info));
        }

        void from_info(const file_info & p_info) {
                m_data.remove_all();
                from_info_overwrite(p_info);
        }
        void from_info_overwrite(const file_info & p_info) {
                for(t_size metawalk = 0, metacount = p_info.meta_get_count(); metawalk < metacount; ++metawalk ) {
                        const t_size valuecount = p_info.meta_enum_value_count(metawalk);
                        if (valuecount > 0) {
                                t_entry & entry = add(p_info.meta_enum_name(metawalk));
                                entry.remove_all();
                                for(t_size valuewalk = 0; valuewalk < valuecount; ++valuewalk) {
                                        entry.insert_last(p_info.meta_enum_value(metawalk,valuewalk));
                                }
                        }
                }
        }
private:
        typedef pfc::chain_list_t<pfc::string8> t_entry;

        t_entry & __add(const char * p_name) {
                return m_data.find_or_add(p_name);
        }

        pfc::map_t<pfc::string8,t_entry,file_info::field_name_comparator> m_data;
};

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