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// Copyright (c) Hercules Dev Team, licensed under GNU GPL.
// See the LICENSE file
// Portions Copyright (c) Athena Dev Teams

#ifndef _SCRIPT_H_
#define _SCRIPT_H_

#include "../common/strlib.h" //StringBuf
#include "map.h" //EVENT_NAME_LENGTH

#include <setjmp.h>
#include <errno.h>

/**
 * Declarations
 **/
struct map_session_data;
struct eri;

/**
 * Defines
 **/
#define NUM_WHISPER_VAR 10

/// Maximum amount of elements in script arrays (soon getting ducked)
#define SCRIPT_MAX_ARRAYSIZE 128

#define SCRIPT_BLOCK_SIZE 512

// Using a prime number for SCRIPT_HASH_SIZE should give better distributions
#define SCRIPT_HASH_SIZE 1021

// Specifies which string hashing method to use
//#define SCRIPT_HASH_DJB2
//#define SCRIPT_HASH_SDBM
#define SCRIPT_HASH_ELF

#define SCRIPT_EQUIP_TABLE_SIZE 20

//#define SCRIPT_DEBUG_DISP
//#define SCRIPT_DEBUG_DISASM
//#define SCRIPT_DEBUG_HASH
//#define SCRIPT_DEBUG_DUMP_STACK

///////////////////////////////////////////////////////////////////////////////
//## TODO possible enhancements: [FlavioJS]
// - 'callfunc' supporting labels in the current npc "::LabelName"
// - 'callfunc' supporting labels in other npcs "NpcName::LabelName"
// - 'function FuncName;' function declarations reverting to global functions
//   if local label isn't found
// - join callfunc and callsub's functionality
// - remove dynamic allocation in add_word()
// - remove GETVALUE / SETVALUE
// - clean up the set_reg / set_val / setd_sub mess
// - detect invalid label references at parse-time

//
// struct script_state* st;
//

/// Returns the script_data at the target index
#define script_getdata(st,i) ( &((st)->stack->stack_data[(st)->start + (i)]) )
/// Returns if the stack contains data at the target index
#define script_hasdata(st,i) ( (st)->end > (st)->start + (i) )
/// Returns the index of the last data in the stack
#define script_lastdata(st) ( (st)->end - (st)->start - 1 )
/// Pushes an int into the stack
#define script_pushint(st,val) script->push_val((st)->stack, C_INT, (val),NULL)
/// Pushes a string into the stack (script engine frees it automatically)
#define script_pushstr(st,val) script->push_str((st)->stack, C_STR, (val))
/// Pushes a copy of a string into the stack
#define script_pushstrcopy(st,val) script->push_str((st)->stack, C_STR, aStrdup(val))
/// Pushes a constant string into the stack (must never change or be freed)
#define script_pushconststr(st,val) script->push_str((st)->stack, C_CONSTSTR, (val))
/// Pushes a nil into the stack
#define script_pushnil(st) script->push_val((st)->stack, C_NOP, 0,NULL)
/// Pushes a copy of the data in the target index
#define script_pushcopy(st,i) script->push_copy((st)->stack, (st)->start + (i))

#define script_isstring(st,i) data_isstring(script_getdata(st,i))
#define script_isint(st,i) data_isint(script_getdata(st,i))

#define script_getnum(st,val) script->conv_num(st, script_getdata(st,val))
#define script_getstr(st,val) script->conv_str(st, script_getdata(st,val))
#define script_getref(st,val) ( script_getdata(st,val)->ref )

// Note: "top" functions/defines use indexes relative to the top of the stack
//       -1 is the index of the data at the top

/// Returns the script_data at the target index relative to the top of the stack
#define script_getdatatop(st,i) ( &((st)->stack->stack_data[(st)->stack->sp + (i)]) )
/// Pushes a copy of the data in the target index relative to the top of the stack
#define script_pushcopytop(st,i) script->push_copy((st)->stack, (st)->stack->sp + (i))
/// Removes the range of values [start,end[ relative to the top of the stack
#define script_removetop(st,start,end) ( script->pop_stack((st), ((st)->stack->sp + (start)), (st)->stack->sp + (end)) )

//
// struct script_data* data;
//

/// Returns if the script data is a string
#define data_isstring(data) ( (data)->type == C_STR || (data)->type == C_CONSTSTR )
/// Returns if the script data is an int
#define data_isint(data) ( (data)->type == C_INT )
/// Returns if the script data is a reference
#define data_isreference(data) ( (data)->type == C_NAME )
/// Returns if the script data is a label
#define data_islabel(data) ( (data)->type == C_POS )
/// Returns if the script data is an internal script function label
#define data_isfunclabel(data) ( (data)->type == C_USERFUNC_POS )

/// Returns if this is a reference to a constant
#define reference_toconstant(data) ( script->str_data[reference_getid(data)].type == C_INT )
/// Returns if this a reference to a param
#define reference_toparam(data) ( script->str_data[reference_getid(data)].type == C_PARAM )
/// Returns if this a reference to a variable
//##TODO confirm it's C_NAME [FlavioJS]
#define reference_tovariable(data) ( script->str_data[reference_getid(data)].type == C_NAME )
/// Returns the unique id of the reference (id and index)
#define reference_getuid(data) ( (data)->u.num )
/// Returns the id of the reference
#define reference_getid(data) ( (int32)(reference_getuid(data) & 0x00ffffff) )
/// Returns the array index of the reference
#define reference_getindex(data) ( (int32)(((uint32)(reference_getuid(data) & 0xff000000)) >> 24) )
/// Returns the name of the reference
#define reference_getname(data) ( script->str_buf + script->str_data[reference_getid(data)].str )
/// Returns the linked list of uid-value pairs of the reference (can be NULL)
#define reference_getref(data) ( (data)->ref )
/// Returns the value of the constant
#define reference_getconstant(data) ( script->str_data[reference_getid(data)].val )
/// Returns the type of param
#define reference_getparamtype(data) ( script->str_data[reference_getid(data)].val )

/// Composes the uid of a reference from the id and the index
#define reference_uid(id,idx) ( (int32)((((uint32)(id)) & 0x00ffffff) | (((uint32)(idx)) << 24)) )

#define not_server_variable(prefix) ( (prefix) != '$' && (prefix) != '.' && (prefix) != '\'')
#define not_array_variable(prefix) ( (prefix) != '$' && (prefix) != '@' && (prefix) != '.' && (prefix) != '\'' )
#define is_string_variable(name) ( (name)[strlen(name) - 1] == '$' )

#define BUILDIN(x) bool buildin_ ## x (struct script_state* st)
#define BUILDIN_A(x) buildin_ ## x

#define script_fetch(st, n, t) \
	if( script_hasdata(st,n) ) \
		(t)=script_getnum(st,n);


/**
 * Enumerations
 **/
typedef enum c_op {
	C_NOP, // end of script/no value (nil)
	C_POS,
	C_INT, // number
	C_PARAM, // parameter variable (see pc_readparam/pc_setparam)
	C_FUNC, // buildin function call
	C_STR, // string (free'd automatically)
	C_CONSTSTR, // string (not free'd)
	C_ARG, // start of argument list
	C_NAME,
	C_EOL, // end of line (extra stack values are cleared)
	C_RETINFO,
	C_USERFUNC, // internal script function
	C_USERFUNC_POS, // internal script function label
	C_REF, // the next call to c_op2 should push back a ref to the left operand
	
	// operators
	C_OP3, // a ? b : c
	C_LOR, // a || b
	C_LAND, // a && b
	C_LE, // a <= b
	C_LT, // a < b
	C_GE, // a >= b
	C_GT, // a > b
	C_EQ, // a == b
	C_NE, // a != b
	C_XOR, // a ^ b
	C_OR, // a | b
	C_AND, // a & b
	C_ADD, // a + b
	C_SUB, // a - b
	C_MUL, // a * b
	C_DIV, // a / b
	C_MOD, // a % b
	C_NEG, // - a
	C_LNOT, // ! a
	C_NOT, // ~ a
	C_R_SHIFT, // a >> b
	C_L_SHIFT, // a << b
	C_ADD_PP, // ++a
	C_SUB_PP, // --a
} c_op;

enum hQueueOpt {
	HQO_NONE,
	HQO_onLogOut,
	HQO_OnDeath,
	HQO_OnMapChange,
	HQO_MAX,
};

enum e_script_state { RUN,STOP,END,RERUNLINE,GOTO,RETFUNC,CLOSE };

enum script_parse_options {
	SCRIPT_USE_LABEL_DB = 0x1,// records labels in scriptlabel_db
	SCRIPT_IGNORE_EXTERNAL_BRACKETS = 0x2,// ignores the check for {} brackets around the script
	SCRIPT_RETURN_EMPTY_SCRIPT = 0x4// returns the script object instead of NULL for empty scripts
};

enum { LABEL_NEXTLINE=1,LABEL_START };

// for advanced scripting support ( nested if, switch, while, for, do-while, function, etc )
// [Eoe / jA 1080, 1081, 1094, 1164]
enum curly_type {
	TYPE_NULL = 0,
	TYPE_IF,
	TYPE_SWITCH,
	TYPE_WHILE,
	TYPE_FOR,
	TYPE_DO,
	TYPE_USERFUNC,
	TYPE_ARGLIST // function argument list
};

enum e_arglist {
	ARGLIST_UNDEFINED = 0,
	ARGLIST_NO_PAREN  = 1,
	ARGLIST_PAREN     = 2,
};

/*==========================================
 * (Only those needed) local declaration prototype
 * - those could be used server-wide so that the scans are done once during processing and never again,
 * - doing so would also improve map zone processing and storage [Ind]
 *------------------------------------------*/

enum {
	MF_NOMEMO,	//0
	MF_NOTELEPORT,
	MF_NOSAVE,
	MF_NOBRANCH,
	MF_NOPENALTY,
	MF_NOZENYPENALTY,
	MF_PVP,
	MF_PVP_NOPARTY,
	MF_PVP_NOGUILD,
	MF_GVG,
	MF_GVG_NOPARTY,	//10
	MF_NOTRADE,
	MF_NOSKILL,
	MF_NOWARP,
	MF_PARTYLOCK,
	MF_NOICEWALL,
	MF_SNOW,
	MF_FOG,
	MF_SAKURA,
	MF_LEAVES,
	/* 21 - 22 free */
	MF_CLOUDS = 23,
	MF_CLOUDS2,
	MF_FIREWORKS,
	MF_GVG_CASTLE,
	MF_GVG_DUNGEON,
	MF_NIGHTENABLED,
	MF_NOBASEEXP,
	MF_NOJOBEXP,	//30
	MF_NOMOBLOOT,
	MF_NOMVPLOOT,
	MF_NORETURN,
	MF_NOWARPTO,
	MF_NIGHTMAREDROP,
	MF_ZONE,
	MF_NOCOMMAND,
	MF_NODROP,
	MF_JEXP,
	MF_BEXP,	//40
	MF_NOVENDING,
	MF_LOADEVENT,
	MF_NOCHAT,
	MF_NOEXPPENALTY,
	MF_GUILDLOCK,
	MF_TOWN,
	MF_AUTOTRADE,
	MF_ALLOWKS,
	MF_MONSTER_NOTELEPORT,
	MF_PVP_NOCALCRANK,	//50
	MF_BATTLEGROUND,
	MF_RESET,
	MF_NOTOMB,
	MF_NOCASHSHOP
};

/**
 * Structures
 **/

struct Script_Config {
	unsigned warn_func_mismatch_argtypes : 1;
	unsigned warn_func_mismatch_paramnum : 1;
	int check_cmdcount;
	int check_gotocount;
	int input_min_value;
	int input_max_value;

	const char *die_event_name;
	const char *kill_pc_event_name;
	const char *kill_mob_event_name;
	const char *login_event_name;
	const char *logout_event_name;
	const char *loadmap_event_name;
	const char *baselvup_event_name;
	const char *joblvup_event_name;

	const char* ontouch_name;
	const char* ontouch2_name;
};

struct script_retinfo {
	struct DBMap* var_function;// scope variables
	struct script_code* script;// script code
	int pos;// script location
	int nargs;// argument count
	int defsp;// default stack pointer
};

struct script_data {
	enum c_op type;
	union script_data_val {
		int num;
		char *str;
		struct script_retinfo* ri;
	} u;
	struct DBMap** ref;
};

// Moved defsp from script_state to script_stack since
// it must be saved when script state is RERUNLINE. [Eoe / jA 1094]
struct script_code {
	int script_size;
	unsigned char* script_buf;
	struct DBMap* script_vars;
};

struct script_stack {
	int sp;// number of entries in the stack
	int sp_max;// capacity of the stack
	int defsp;
	struct script_data *stack_data;// stack
	struct DBMap* var_function;// scope variables
};

/* [Ind/Hercules] */
struct hQueue {
	int id;
	int *item;
	int items;/* how many actual items are in the array */
	int size;/* size of the *item array, not the current amount of items in it since it can have empty slots */
	/* events */
	char onLogOut[EVENT_NAME_LENGTH];
	char onDeath[EVENT_NAME_LENGTH];
	char onMapChange[EVENT_NAME_LENGTH];
};

struct hQueueIterator {
	int *item;
	int items;
	int pos;
};

struct script_state {
	struct script_stack* stack;
	int start,end;
	int pos;
	enum e_script_state state;
	int rid,oid;
	struct script_code *script, *scriptroot;
	struct sleep_data {
		int tick,timer,charid;
	} sleep;
	int instance_id;
	//For backing up purposes
	struct script_state *bk_st;
	unsigned char hIterator;
	int bk_npcid;
	unsigned freeloop : 1;// used by buildin_freeloop
	unsigned op2ref : 1;// used by op_2
	unsigned npc_item_flag : 1;
	unsigned int id;
};

struct script_reg {
	int index;
	int data;
};

struct script_regstr {
	int index;
	char* data;
};

struct script_function {
	bool (*func)(struct script_state *st);
	char *name;
	char *arg;
};

// String buffer structures.
// str_data stores string information
struct str_data_struct {
	enum c_op type;
	int str;
	int backpatch;
	int label;
	bool (*func)(struct script_state *st);
	int val;
	int next;
};

struct script_label_entry {
	int key,pos;
};

struct script_syntax_data {
	struct {
		enum curly_type type;
		int index;
		int count;
		int flag;
		struct linkdb_node *case_label;
	} curly[256];		// Information right parenthesis
	int curly_count;	// The number of right brackets
	int index;			// Number of the syntax used in the script
};

/**
 * Interface
 **/
struct script_interface {
	/* */
	DBMap *st_db;
	unsigned int active_scripts;
	unsigned int next_id;
	struct eri *st_ers;
	struct eri *stack_ers;
	/* */
	struct hQueue *hq;
	struct hQueueIterator *hqi;
	int hqs, hqis;
	int hqe[HQO_MAX];
	/*  */
	char **buildin;
	unsigned int buildin_count;
	/* */
	struct str_data_struct *str_data;
	int str_data_size; // size of the data
	int str_num; // next id to be assigned
	// str_buf holds the strings themselves
	char *str_buf;
	int str_size; // size of the buffer
	int str_pos; // next position to be assigned
	int str_hash[SCRIPT_HASH_SIZE];
	/* */
	char *word_buf;
	int word_size;
	/*  */
	unsigned short current_item_id;
	/* */
	struct script_label_entry *labels;
	int label_count;
	int labels_size;
	/* */
	struct Script_Config config;
	/* */
	/// temporary buffer for passing around compiled bytecode
	/// @see add_scriptb, set_label, parse_script
	unsigned char* buf;
	int pos, size;
	/* */
	struct script_syntax_data syntax;
	/* */
	int parse_options;
	// important buildin function references for usage in scripts
	int buildin_set_ref;
	int buildin_callsub_ref;
	int buildin_callfunc_ref;
	int buildin_getelementofarray_ref;
	/* */
	jmp_buf     error_jump;
	char*       error_msg;
	const char* error_pos;
	int         error_report; // if the error should produce output
	// Used by disp_warning_message
	const char* parser_current_src;
	const char* parser_current_file;
	int         parser_current_line;
	int parse_syntax_for_flag;
	// aegis->athena slot position conversion table
	unsigned int equip[SCRIPT_EQUIP_TABLE_SIZE];
	/* */
	/* Caches compiled autoscript item code. */
	/* Note: This is not cleared when reloading itemdb. */
	DBMap* autobonus_db; // char* script -> char* bytecode
	DBMap* userfunc_db; // const char* func_name -> struct script_code*
	/* */
	int potion_flag; //For use on Alchemist improved potions/Potion Pitcher. [Skotlex]
	int potion_hp, potion_per_hp, potion_sp, potion_per_sp;
	int potion_target;
	/*  */
	void (*init) (bool minimal);
	void (*final) (void);
	int  (*reload) (void);
	/* parse */
	struct script_code* (*parse) (const char* src,const char* file,int line,int options);
	void (*parse_builtin) (void);
	const char* (*parse_subexpr) (const char* p,int limit);
	const char* (*skip_space) (const char* p);
	void (*error) (const char* src, const char* file, int start_line, const char* error_msg, const char* error_pos);
	void (*warning) (const char* src, const char* file, int start_line, const char* error_msg, const char* error_pos);
	/* */
	bool (*addScript) (char *name, char *args, bool (*func)(struct script_state *st));
	int (*conv_num) (struct script_state *st,struct script_data *data);
	const char* (*conv_str) (struct script_state *st,struct script_data *data);
	TBL_PC *(*rid2sd) (struct script_state *st);
	void (*detach_rid) (struct script_state* st);
	struct script_data* (*push_val)(struct script_stack* stack, enum c_op type, int val, struct DBMap** ref);
	void (*get_val) (struct script_state* st, struct script_data* data);
	void* (*get_val2) (struct script_state* st, int uid, struct DBMap** ref);
	struct script_data* (*push_str) (struct script_stack* stack, enum c_op type, char* str);
	struct script_data* (*push_copy) (struct script_stack* stack, int pos);
	void (*pop_stack) (struct script_state* st, int start, int end);
	void (*set_constant) (const char* name, int value, bool isparameter);
	void (*set_constant2) (const char *name, int value, bool isparameter);
	void (*set_constant_force) (const char *name, int value, bool isparameter);
	bool (*get_constant) (const char* name, int* value);
	void (*label_add)(int key, int pos);
	void (*run) (struct script_code *rootscript,int pos,int rid,int oid);
	void (*run_main) (struct script_state *st);
	int (*run_timer) (int tid, int64 tick, int id, intptr_t data);
	int (*set_var) (struct map_session_data *sd, char *name, void *val);
	void (*stop_instances) (struct script_code *code);
	void (*free_code) (struct script_code* code);
	void (*free_vars) (struct DBMap *var_storage);
	struct script_state* (*alloc_state) (struct script_code* rootscript, int pos, int rid, int oid);
	void (*free_state) (struct script_state* st);
	void (*run_autobonus) (const char *autobonus,int id, int pos);
	void (*cleararray_pc) (struct map_session_data* sd, const char* varname, void* value);
	void (*setarray_pc) (struct map_session_data* sd, const char* varname, uint8 idx, void* value, int* refcache);
	int (*config_read) (char *cfgName);
	int (*add_str) (const char* p);
	const char* (*get_str) (int id);
	int (*search_str) (const char* p);
	void (*setd_sub) (struct script_state *st, struct map_session_data *sd, const char *varname, int elem, void *value, struct DBMap **ref);
	void (*attach_state) (struct script_state* st);
	/* */
	struct hQueue *(*queue) (int idx);
	bool (*queue_add) (int idx, int var);
	bool (*queue_del) (int idx);
	bool (*queue_remove) (int idx, int var);
	int (*queue_create) (void);
	void (*queue_clear) (int idx);
	/* */
	const char * (*parse_curly_close) (const char *p);
	const char * (*parse_syntax_close) (const char *p);
	const char * (*parse_syntax_close_sub) (const char *p, int *flag);
	const char * (*parse_syntax) (const char *p);
	c_op (*get_com) (unsigned char *scriptbuf, int *pos);
	int (*get_num) (unsigned char *scriptbuf, int *pos);
	const char* (*op2name) (int op);
	void (*reportsrc) (struct script_state *st);
	void (*reportdata) (struct script_data *data);
	void (*reportfunc) (struct script_state *st);
	void (*disp_error_message2) (const char *mes, const char *pos, int report);
	void (*disp_warning_message) (const char *mes, const char *pos);
	void (*check_event) (struct script_state *st, const char *evt);
	unsigned int (*calc_hash) (const char *p);
	void (*addb) (int a);
	void (*addc) (int a);
	void (*addi) (int a);
	void (*addl) (int l);
	void (*set_label) (int l, int pos, const char *script_pos);
	const char* (*skip_word) (const char *p);
	int (*add_word) (const char *p);
	const char* (*parse_callfunc) (const char *p, int require_paren, int is_custom);
	void (*parse_nextline) (bool first, const char *p);
	const char* (*parse_variable) (const char *p);
	const char* (*parse_simpleexpr) (const char *p);
	const char* (*parse_expr) (const char *p);
	const char* (*parse_line) (const char *p);
	void (*read_constdb) (void);
	const char* (*print_line) (StringBuf *buf, const char *p, const char *mark, int line);
	void (*errorwarning_sub) (StringBuf *buf, const char *src, const char *file, int start_line, const char *error_msg, const char *error_pos);
	int (*set_reg) (struct script_state *st, TBL_PC *sd, int num, const char *name, const void *value, struct DBMap **ref);
	void (*stack_expand) (struct script_stack *stack);
	struct script_data* (*push_retinfo) (struct script_stack *stack, struct script_retinfo *ri, DBMap **ref);
	int (*pop_val) (struct script_state *st);
	void (*op_3) (struct script_state *st, int op);
	void (*op_2str) (struct script_state *st, int op, const char *s1, const char *s2);
	void (*op_2num) (struct script_state *st, int op, int i1, int i2);
	void (*op_2) (struct script_state *st, int op);
	void (*op_1) (struct script_state *st, int op);
	void (*check_buildin_argtype) (struct script_state *st, int func);
	void (*detach_state) (struct script_state *st, bool dequeue_event);
	int (*db_free_code_sub) (DBKey key, DBData *data, va_list ap);
	void (*add_autobonus) (const char *autobonus);
	int (*menu_countoptions) (const char *str, int max_count, int *total);
	int (*buildin_areawarp_sub) (struct block_list *bl, va_list ap);
	int (*buildin_areapercentheal_sub) (struct block_list *bl, va_list ap);
	int32 (*getarraysize) (struct script_state *st, int32 id, int32 idx, int isstring, struct DBMap **ref);
	void (*buildin_delitem_delete) (struct map_session_data *sd, int idx, int *amount, bool delete_items);
	bool (*buildin_delitem_search) (struct map_session_data *sd, struct item *it, bool exact_match);
	int (*buildin_killmonster_sub_strip) (struct block_list *bl, va_list ap);
	int (*buildin_killmonster_sub) (struct block_list *bl, va_list ap);
	int (*buildin_killmonsterall_sub_strip) (struct block_list *bl, va_list ap);
	int (*buildin_killmonsterall_sub) (struct block_list *bl, va_list ap);
	int (*buildin_announce_sub) (struct block_list *bl, va_list ap);
	int (*buildin_getareausers_sub) (struct block_list *bl, va_list ap);
	int (*buildin_getareadropitem_sub) (struct block_list *bl, va_list ap);
	int (*mapflag_pvp_sub) (struct block_list *bl, va_list ap);
	int (*buildin_pvpoff_sub) (struct block_list *bl, va_list ap);
	int (*buildin_maprespawnguildid_sub_pc) (struct map_session_data *sd, va_list ap);
	int (*buildin_maprespawnguildid_sub_mob) (struct block_list *bl, va_list ap);
	int (*buildin_mobcount_sub) (struct block_list *bl, va_list ap);
	int (*playBGM_sub) (struct block_list *bl, va_list ap);
	int (*playBGM_foreachpc_sub) (struct map_session_data *sd, va_list args);
	int (*soundeffect_sub) (struct block_list *bl, va_list ap);
	int (*buildin_query_sql_sub) (struct script_state *st, Sql *handle);
	int (*axtoi) (const char *hexStg);
	int (*buildin_instance_warpall_sub) (struct block_list *bl, va_list ap);
	int (*buildin_mobuseskill_sub) (struct block_list *bl, va_list ap);
	int (*cleanfloor_sub) (struct block_list *bl, va_list ap);
	int (*run_func) (struct script_state *st);
};

struct script_interface *script;

void script_defaults(void);

#endif /* _SCRIPT_H_ */