#5 允许配置ID重用；提供工具函数Maat_helper_read_column，用于处理行列。

inc/Maat_rule.h

@@ -258,6 +258,12 @@ int Maat_rule_get_ex_new_index(Maat_feather_t feather, const char* compile_table
 //returned data is duplicated by dup_func of Maat_rule_get_ex_new_index,  caller is responsible to free the data.
 MAAT_RULE_EX_DATA Maat_rule_get_ex_data(Maat_feather_t feather, const struct Maat_rule_t* rule, int idx);
 
+//Helper function for parsing space or tab seperated line.
+//column_seq: column sequence is numberd from 1.
+//Return 0 if success.
+int Maat_helper_read_column(const char* line, int column_seq, size_t *column_offset, size_t *column_len);
+
+
 //Following functions are similar to Maat_rule_get_ex_data, except they are effective on plugin table.
 typedef void*  MAAT_PLUGIN_EX_DATA;
 typedef void Maat_plugin_EX_new_func_t(int table_id, const char* key, const char* table_line, MAAT_PLUGIN_EX_DATA* ad, long argl, void *argp);