BCI-dev/interpreter/method_dispatcher/method_dispatcher.h

#ifndef bci_method_dispatcher_h__
#define bci_method_dispatcher_h__

#include <inttypes.h>
#include "../base.h"

typedef struct dispatch_tree_node_s
{
	struct dispatch_tree_node_s * higher;
	struct dispatch_tree_node_s * lower;
	uint16_t word;
	bci_core_method_t method;
} * dispatch_tree_node_t;

typedef struct dispatch_tree_s
{
	dispatch_tree_node_t root;
} * dispatch_tree_t;

dispatch_tree_t dispatch_tree_t_new(void);
/*
 * This deletes the tree and will invoke dispatch_tree_node_t_del on 
 * tree->root (which will delete all the other nodes recursively). 
 * If you want to keep nodes you have to explicityl remove the reference to
 * them by setting them to NULL.
 * */
void dispatch_tree_t_del(dispatch_tree_t tree);


dispatch_tree_node_t dispatch_tree_node_t_new(uint16_t word
				, bci_core_method_t method);
/*
 * This deletes the node an will invoke dispatch_tree_node_t_del on
 * node->higher and node->lower. If you want to keep those nodes 
 * you have to explicitly clear the reference by setting them to NULL.
 * */
void dispatch_tree_node_t_del(dispatch_tree_node_t node);


/*
 * Insert a new key-value-pair into the tree.
 *
 * Return codes:
 * 0: OK
 * 1: out of memory
 * 2: key already in tree
 * */
char dispatch_tree_t_insert(dispatch_tree_t tree
			, uint16_t word
			, bci_core_method_t method);


bci_core_method_t dispatch_tree_t_dispatch(dispatch_tree_t tree
					, uint16_t word);



typedef struct dispatch_tree_autoinserter_s
{
	uint16_t mayor;
	uint16_t minor;
	dispatch_tree_t tree;
} * dispatch_tree_autoinserter_t;

dispatch_tree_autoinserter_t dispatch_tree_autoinserter_t_new(dispatch_tree_t tree);
void dispatch_tree_autoinserter_t_del(dispatch_tree_autoinserter_t autoinserter);

/*
 * This function inserts a new method into the tree and automatically 
 * chooses the optimal word to prevent degeneration.
 *
 * NOTE:
 * When inserting mutliple methods this function acts deterministic,
 * IF AND ONLY IF the order of the methods is not changed.
 *
 * The assembler will bring an analogous function that allows one 
 * to determine the opcodes of the methods.
 *
 * NOTE:
 * This algorithm will not work for more that 1023 registered opcodes.
 * This limit is however considered acceptable.
 *
 * */
uint16_t dispatch_tree_autoinserter_t_insert(
			dispatch_tree_autoinserter_t autoinserter
			, bci_core_method_t method);
#endif