svalue_t evaluate_function(int start, int stop)
{
svariable_t *func = NULL;
int startpoint, endpoint;
// the arguments need to be built locally in case of
// function returns as function arguments eg
// print("here is a random number: ", rnd() );
int argc;
svalue_t argv[MAXARGS];
if (tokens[start].type != TO_function || tokens[stop].type != TO_oper || tokens[stop].v[0] != ')')
script_error("misplaced closing bracket\n");
// all the functions are stored in the global script
else if (!(func = global_script.variableforname(tokens[start].v)))
script_error("no such function: '%s'\n", tokens[start].v);
else if (func->type != svt_function)
script_error("'%s' not a function\n", tokens[start].v);
if (killscript) return nullvar; // one of the above errors occurred
// build the argument list
// use a C command-line style system rather than
// a system using a fixed length list
argc = 0;
endpoint = start + 2; // ignore the function name and first bracket
while (endpoint < stop)
{
startpoint = endpoint;
endpoint = find_operator(startpoint, stop-1, ",");
// check for -1: no more ','s
if (endpoint == -1)
endpoint = stop; // evaluate the last expression
if (endpoint-1 < startpoint)
break;
argv[argc] = evaluate_expression(startpoint, endpoint-1);
endpoint++; // skip the ','
argc++;
}
// store the arguments in the global arglist
t_argc = argc;
t_argv = argv;
if(killscript) return nullvar;
// now run the function
func->value.handler();
// return the returned value
return t_return;
}
void FParser::OPdecrement(svalue_t &result, int start, int n, int stop)
{
if(start == n) // ++n
{
DFsVariable *var;
var = Script->FindVariable(Tokens[stop]);
if(!var)
{
script_error("unknown variable '%s'\n", Tokens[stop]);
}
var->GetValue(result);
// haleyjd
if(var->type != svt_fixed)
{
result.value.i = intvalue(result) - 1;
result.type = svt_int;
var->SetValue (result);
}
else
{
result.setDouble(floatvalue(result)-1);
result.type = svt_fixed;
var->SetValue (result);
}
}
else if(stop == n) // n++
{
svalue_t newvalue;
DFsVariable *var;
var = Script->FindVariable(Tokens[start]);
if(!var)
{
script_error("unknown variable '%s'\n", Tokens[start]);
}
var->GetValue(result);
// haleyjd
if(var->type != svt_fixed)
{
newvalue.type = svt_int;
newvalue.value.i = intvalue(result) - 1;
var->SetValue (newvalue);
}
else
{
newvalue.setDouble(floatvalue(result)-1);
var->SetValue (newvalue);
}
}
else
{
script_error("incorrect arguments to ++ operator\n");
}
}
void DFsVariable::SetValue(FLevelLocals *Level, const svalue_t &newvalue)
{
if(type == svt_const)
{
// const adapts to the value it is set to
type = newvalue.type;
}
switch (type)
{
case svt_int:
value.i = intvalue(newvalue);
break;
case svt_string:
if (newvalue.type == svt_string)
{
string = newvalue.string;
}
else
{
string = stringvalue(newvalue);
}
break;
case svt_fixed:
value.fixed = fixedvalue(newvalue);
break;
case svt_mobj:
actor = actorvalue(Level, newvalue);
break;
case svt_pInt:
*value.pI = intvalue(newvalue);
break;
case svt_pMobj:
*value.pMobj = actorvalue(Level, newvalue);
break;
case svt_function:
script_error("attempt to set function to a value\n");
break;
default:
script_error("invalid variable type\n");
break;
}
}
void parse_include(char *lumpname)
{
int lumpnum;
char *lump, *end;
char *saved_rover;
if(-1 == (lumpnum = W_GetNumForName(lumpname)) )
{
script_error("include lump '%s' not found!\n", lumpname);
return;
}
lump = W_CacheLumpNum(lumpnum, PU_STATIC);
// realloc bigger for NULL at end
lump = Z_Realloc(lump, W_LumpLength(lumpnum)+10, PU_STATIC, NULL);
saved_rover = rover; // save rover during include
rover = lump; end = lump+W_LumpLength(lumpnum);
*end = 0;
// preprocess the include
// we assume that it does not include sections or labels or
// other nasty things
process_find_char(lump, 0);
// now parse the lump
parse_data(lump, end);
// restore rover
rover = saved_rover;
// free the lump
Z_Free(lump);
}
void AsyncEngine::step(lua_State *L, int errorhandler)
{
lua_getglobal(L, "engine");
resultQueueMutex.Lock();
while (!resultQueue.empty()) {
LuaJobInfo jobDone = resultQueue.front();
resultQueue.pop_front();
lua_getfield(L, -1, "async_event_handler");
if (lua_isnil(L, -1)) {
assert("Async event handler does not exist!" == 0);
}
luaL_checktype(L, -1, LUA_TFUNCTION);
lua_pushinteger(L, jobDone.id);
lua_pushlstring(L, jobDone.serializedResult.data(),
jobDone.serializedResult.size());
if (lua_pcall(L, 2, 0, errorhandler)) {
script_error(L);
}
}
resultQueueMutex.Unlock();
lua_pop(L, 1); // Pop engine
}
void LuaABM::trigger(ServerEnvironment *env, v3s16 p, MapNode n,
u32 active_object_count, u32 active_object_count_wider)
{
GameScripting *scriptIface = env->getScriptIface();
scriptIface->realityCheck();
lua_State *L = scriptIface->getStack();
assert(lua_checkstack(L, 20));
StackUnroller stack_unroller(L);
// Get minetest.registered_abms
lua_getglobal(L, "minetest");
lua_getfield(L, -1, "registered_abms");
luaL_checktype(L, -1, LUA_TTABLE);
int registered_abms = lua_gettop(L);
// Get minetest.registered_abms[m_id]
lua_pushnumber(L, m_id);
lua_gettable(L, registered_abms);
if(lua_isnil(L, -1))
assert(0);
// Call action
luaL_checktype(L, -1, LUA_TTABLE);
lua_getfield(L, -1, "action");
luaL_checktype(L, -1, LUA_TFUNCTION);
push_v3s16(L, p);
pushnode(L, n, env->getGameDef()->ndef());
lua_pushnumber(L, active_object_count);
lua_pushnumber(L, active_object_count_wider);
if(lua_pcall(L, 4, 0, 0))
script_error(L, "error: %s", lua_tostring(L, -1));
}
void AsyncEngine::Step(lua_State *L) {
lua_pushcfunction(L, script_error_handler);
int errorhandler = lua_gettop(L);
lua_getglobal(L, "engine");
m_ResultQueueMutex.Lock();
while(!m_ResultQueue.empty()) {
LuaJobInfo jobdone = m_ResultQueue.front();
m_ResultQueue.erase(m_ResultQueue.begin());
lua_getfield(L, -1, "async_event_handler");
if(lua_isnil(L, -1))
assert("Someone managed to destroy a async callback in engine!" == 0);
luaL_checktype(L, -1, LUA_TFUNCTION);
lua_pushinteger(L, jobdone.JobId);
lua_pushlstring(L, jobdone.serializedResult.c_str(),
jobdone.serializedResult.length());
if(lua_pcall(L, 2, 0, errorhandler)) {
script_error(L);
}
}
m_ResultQueueMutex.Unlock();
lua_pop(L, 2); // Pop engine and error handler
}
void log_deprecated(lua_State *L, std::string message)
{
static bool configured = false;
static bool dolog = false;
static bool doerror = false;
// performance optimization to not have to read and compare setting for every logline
if (!configured) {
std::string value = g_settings->get("deprecated_lua_api_handling");
if (value == "log") {
dolog = true;
}
if (value == "error") {
dolog = true;
doerror = true;
}
}
if (doerror) {
if (L != NULL) {
script_error(L);
} else {
FATAL_ERROR("Can't do a scripterror for this deprecated message, so exit completely!");
}
}
if (dolog) {
/* abusing actionstream because of lack of file-only-logged loglevel */
actionstream << message << std::endl;
if (L != NULL) {
actionstream << script_get_backtrace(L) << std::endl;
}
}
}
struct script_cmd* script_cmd_make_op3sec(const char* arg0, struct script_exp* arg1, struct script_cmd* arg2)
{
if (strcmp(arg0, "while") == 0) {
struct script_cmd* cmd = script_cmd_alloc();
cmd->type = SCRIPT_CMD_WHILE;
cmd->data.op2ec.arg0 = arg1;
cmd->data.op2ec.arg1 = arg2;
return cmd;
} else if (strcmp(arg0, "repeat") == 0) {
struct script_cmd* cmd = script_cmd_alloc();
cmd->type = SCRIPT_CMD_REPEAT;
cmd->data.op2ecd.arg0 = arg1;
cmd->data.op2ecd.arg1 = arg2;
cmd->data.op2ecd.value_set = 0;
cmd->data.op2ecd.value = 0;
return cmd;
} else if (strcmp(arg0, "if") == 0) {
struct script_cmd* cmd = script_cmd_alloc();
cmd->type = SCRIPT_CMD_IF;
cmd->data.op2ec.arg0 = arg1;
cmd->data.op2ec.arg1 = arg2;
return cmd;
} else {
char buffer[128];
snprintf(buffer, sizeof(buffer), "Unknown command %s", arg0);
script_error(buffer);
return 0;
}
}
// minetest.get_objects_inside_radius(pos, radius)
int ModApiEnvMod::l_get_objects_inside_radius(lua_State *L)
{
// Get the table insert function
lua_getglobal(L, "table");
lua_getfield(L, -1, "insert");
int table_insert = lua_gettop(L);
GET_ENV_PTR;
// Do it
v3f pos = checkFloatPos(L, 1);
float radius = luaL_checknumber(L, 2) * BS;
std::set<u16> ids = env->getObjectsInsideRadius(pos, radius);
lua_newtable(L);
int table = lua_gettop(L);
for(std::set<u16>::const_iterator
i = ids.begin(); i != ids.end(); i++){
ServerActiveObject *obj = env->getActiveObject(*i);
// Insert object reference into table
lua_pushvalue(L, table_insert);
lua_pushvalue(L, table);
getScriptApiBase(L)->objectrefGetOrCreate(obj);
if(lua_pcall(L, 2, 0, 0))
script_error(L, "error: %s", lua_tostring(L, -1));
}
return 1;
}
// rollback_revert_actions_by(actor, seconds) -> bool, log messages
int ModApiBasic::l_rollback_revert_actions_by(lua_State *L)
{
std::string actor = luaL_checkstring(L, 1);
int seconds = luaL_checknumber(L, 2);
Server *server = getServer(L);
IRollbackManager *rollback = server->getRollbackManager();
std::list<RollbackAction> actions = rollback->getRevertActions(actor, seconds);
std::list<std::string> log;
bool success = server->rollbackRevertActions(actions, &log);
// Push boolean result
lua_pushboolean(L, success);
// Get the table insert function and push the log table
lua_getglobal(L, "table");
lua_getfield(L, -1, "insert");
int table_insert = lua_gettop(L);
lua_newtable(L);
int table = lua_gettop(L);
for(std::list<std::string>::const_iterator i = log.begin();
i != log.end(); i++)
{
lua_pushvalue(L, table_insert);
lua_pushvalue(L, table);
lua_pushstring(L, i->c_str());
if(lua_pcall(L, 2, 0, 0))
script_error(L, "error: %s", lua_tostring(L, -1));
}
lua_remove(L, -2); // Remove table
lua_remove(L, -2); // Remove insert
return 2;
}
// Push the list of callbacks (a lua table).
// Then push nargs arguments.
// Then call this function, which
// - runs the callbacks
// - replaces the table and arguments with the return value,
// computed depending on mode
void script_run_callbacks(lua_State *L, int nargs, RunCallbacksMode mode)
{
assert(lua_gettop(L) >= nargs + 1);
// Insert error handler
lua_pushcfunction(L, script_error_handler);
int errorhandler = lua_gettop(L) - nargs - 1;
lua_insert(L, errorhandler);
// Insert minetest.run_callbacks between error handler and table
lua_getglobal(L, "minetest");
lua_getfield(L, -1, "run_callbacks");
lua_remove(L, -2);
lua_insert(L, errorhandler + 1);
// Insert mode after table
lua_pushnumber(L, (int) mode);
lua_insert(L, errorhandler + 3);
// Stack now looks like this:
// ... <error handler> <run_callbacks> <table> <mode> <arg#1> <arg#2> ... <arg#n>
if (lua_pcall(L, nargs + 2, 1, errorhandler)) {
script_error(L);
}
lua_remove(L, -2); // Remove error handler
}
// minetest.add_item(pos, itemstack or itemstring or table) -> ObjectRef or nil
// pos = {x=num, y=num, z=num}
int ModApiEnvMod::l_add_item(lua_State *L)
{
GET_ENV_PTR;
// pos
//v3f pos = checkFloatPos(L, 1);
// item
ItemStack item = read_item(L, 2,getServer(L));
if(item.empty() || !item.isKnown(getServer(L)->idef()))
return 0;
// Use minetest.spawn_item to spawn a __builtin:item
lua_getglobal(L, "minetest");
lua_getfield(L, -1, "spawn_item");
if(lua_isnil(L, -1))
return 0;
lua_pushvalue(L, 1);
lua_pushstring(L, item.getItemString().c_str());
if(lua_pcall(L, 2, 1, 0))
script_error(L, "error: %s", lua_tostring(L, -1));
return 1;
/*lua_pushvalue(L, 1);
lua_pushstring(L, "__builtin:item");
lua_pushstring(L, item.getItemString().c_str());
return l_add_entity(L);*/
/*// Do it
ServerActiveObject *obj = createItemSAO(env, pos, item.getItemString());
int objectid = env->addActiveObject(obj);
// If failed to add, return nothing (reads as nil)
if(objectid == 0)
return 0;
// Return ObjectRef
objectrefGetOrCreate(L, obj);
return 1;*/
}
bool FParser::spec_if()
{
int endtoken;
svalue_t eval;
if((endtoken = FindOperator(0, NumTokens-1, ")")) == -1)
{
script_error("parse error in if statement\n");
return false;
}
// 2 to skip past the 'if' and '('
EvaluateExpression(eval, 2, endtoken-1);
bool ifresult = !!intvalue(eval);
if(Section && BraceType == bracket_open && endtoken == NumTokens-1)
{
// {} braces
if(!ifresult) // skip to end of section
Rover = Script->SectionEnd(Section) + 1;
}
else if(ifresult) // if() without {} braces
{
// nothing to do ?
if(endtoken != NumTokens-1)
EvaluateExpression(eval, endtoken+1, NumTokens-1);
}
return ifresult;
}
bool scriptapi_item_on_place(lua_State *L, ItemStack &item,
ServerActiveObject *placer, const PointedThing &pointed)
{
actionstream<<"DebugTracePlaceEnteredLua scriptapi_item Line 250 "<<std::endl;
realitycheck(L);
assert(lua_checkstack(L, 20));
StackUnroller stack_unroller(L);
actionstream<<"DebugTracePlacePassedStackCheck scriptapi_item Line 254 "<<std::endl;
// Push callback function on stack
if(!get_item_callback(L, item.name.c_str(), "on_place"))
actionstream<<"DebugTracePlaceLuaReturningFalse scriptapi_item Line 257 "<<std::endl;
return false;
// Call function
LuaItemStack::create(L, item);
objectref_get_or_create(L, placer);
push_pointed_thing(L, pointed);
actionstream<<"DebugTracePlaceClearToRunLua scriptapi_item Line 263 "<<std::endl;
if(lua_pcall(L, 3, 1, 0))
script_error(L, "error: %s", lua_tostring(L, -1));
if(!lua_isnil(L, -1))
actionstream<<"DebugTracePlaceItemReturned scriptapi_item Line 267 "<<std::endl;
item = read_item(L, -1);
actionstream<<"DebugTracePlaceLuaReturningTrue scriptapi_item Line 270 "<<std::endl;
return true;
}
// add_item(pos, itemstack or itemstring or table) -> ObjectRef or nil
// pos = {x=num, y=num, z=num}
int ModApiEnvMod::l_add_item(lua_State *L)
{
GET_ENV_PTR;
// pos
//v3f pos = checkFloatPos(L, 1);
// item
ItemStack item = read_item(L, 2,getServer(L));
if(item.empty() || !item.isKnown(getServer(L)->idef()))
return 0;
lua_pushcfunction(L, script_error_handler);
int errorhandler = lua_gettop(L);
// Use spawn_item to spawn a __builtin:item
lua_getglobal(L, "core");
lua_getfield(L, -1, "spawn_item");
lua_remove(L, -2); // Remove core
if(lua_isnil(L, -1))
return 0;
lua_pushvalue(L, 1);
lua_pushstring(L, item.getItemString().c_str());
if(lua_pcall(L, 2, 1, errorhandler))
script_error(L);
lua_remove(L, errorhandler); // Remove error handler
return 1;
}
struct script_cmd* script_cmd_make_op2se(const char* arg0, struct script_exp* arg1)
{
if (strcmp(arg0, "wait") == 0) {
struct script_cmd* cmd = script_cmd_alloc();
cmd->type = SCRIPT_CMD_WAIT;
cmd->data.op1e.arg0 = arg1;
return cmd;
} else if (strcmp(arg0, "delay") == 0) {
struct script_cmd* cmd = script_cmd_alloc();
cmd->type = SCRIPT_CMD_DELAY;
cmd->data.op1ed.arg0 = arg1;
cmd->data.op1ed.value_set = 0;
cmd->data.op1ed.value = 0;
return cmd;
} else if (strcmp(arg0, "evaluate") == 0) {
struct script_cmd* cmd = script_cmd_alloc();
cmd->type = SCRIPT_CMD_EVALUATE;
cmd->data.op1e.arg0 = arg1;
return cmd;
} else {
char buffer[128];
snprintf(buffer, sizeof(buffer), "Unknown operation %s", arg0);
script_error(buffer);
return 0;
}
}
void FParser::spec_for()
{
svalue_t eval;
int start;
int comma1, comma2; // token numbers of the seperating commas
if(!Section)
{
script_error("need {} delimiters for for()\n");
return;
}
// is a valid section
start = 2; // skip "for" and "(": start on third token(2)
// find the seperating commas first
if( (comma1 = FindOperator(start, NumTokens-1, ",")) == -1
|| (comma2 = FindOperator(comma1+1, NumTokens-1, ",")) == -1)
{
script_error("incorrect arguments to for()\n"); // haleyjd:
return; // said if()
}
// are we looping back from a previous loop?
if(Section == PrevSection)
{
// do the loop 'action' (third argument)
EvaluateExpression(eval, comma2+1, NumTokens-2);
// check if we should run the loop again (second argument)
EvaluateExpression(eval, comma1+1, comma2-1);
if(!intvalue(eval))
{
// stop looping
Rover = Script->SectionEnd(Section) + 1;
}
}
else
{
// first time: starting the loop
// just evaluate the starting expression (first arg)
EvaluateExpression(eval, start, comma1-1);
}
}
int script_file_exec(const char *file)
{
int err = 0, handler;
if ((err = luaL_loadfile(L, file)) != 0) {
return script_error(L);
}
handler = lua_gettop(L);
lua_pushcfunction(L, script_traceback);
lua_insert(L, handler);
err = lua_pcall(L, 0, LUA_MULTRET, handler);
lua_remove(L, handler);
if (err) {
return script_error(L);
}
return SCRIPT_RC_OK;
}
void setvariablevalue(svariable_t *v, svalue_t newvalue)
{
if(killscript) return; // protect the variables when killing script
if(!v) return;
if(v->type == svt_const)
{
// const adapts to the value it is set to
v->type = newvalue.type;
// alloc memory for string
if(v->type == svt_string) // static incase a global_script var
v->value.s = Z_Malloc(128, PU_STATIC, 0);
}
if(v->type == svt_int)
v->value.i = intvalue(newvalue);
if(v->type == svt_string)
strcpy(v->value.s, stringvalue(newvalue));
if(v->type == svt_fixed)
v->value.fixed = fixedvalue(newvalue);
if(v->type == svt_mobj)
v->value.mobj = MobjForSvalue(newvalue);
if(v->type == svt_pInt)
*v->value.pI = intvalue(newvalue);
if(v->type == svt_pString)
{
// free old value
free(*v->value.pS);
// dup new string
*v->value.pS = strdup(stringvalue(newvalue));
}
if(v->type == svt_pFixed)
*v->value.pFixed = fixedvalue(newvalue);
if(v->type == svt_pMobj)
*v->value.pMobj = MobjForSvalue(newvalue);
if(v->type == svt_function)
script_error("attempt to set function to a value\n");
}
void FParser::EvaluateExpression(svalue_t &result, int start, int stop)
{
int i, n;
// possible pointless brackets
if(TokenType[start] == operator_ && TokenType[stop] == operator_)
PointlessBrackets(&start, &stop);
if(start == stop) // only 1 thing to evaluate
{
SimpleEvaluate(result, start);
return;
}
// go through each operator in order of precedence
for(i=0; i<num_operators; i++)
{
// check backwards for the token. it has to be
// done backwards for left-to-right reading: eg so
// 5-3-2 is (5-3)-2 not 5-(3-2)
if (operators[i].direction==forward)
{
n = FindOperatorBackwards(start, stop, operators[i].string);
}
else
{
n = FindOperator(start, stop, operators[i].string);
}
if( n != -1)
{
// call the operator function and evaluate this chunk of tokens
(this->*operators[i].handler)(result, start, n, stop);
return;
}
}
if(TokenType[start] == function)
{
EvaluateFunction(result, start, stop);
return;
}
// error ?
{
FString tempstr;
for(i=start; i<=stop; i++) tempstr << Tokens[i] << ' ';
script_error("couldnt evaluate expression: %s\n",tempstr.GetChars());
}
}
// get_modnames()
// the returned list is sorted alphabetically for you
int ModApiBasic::l_get_modnames(lua_State *L)
{
NO_MAP_LOCK_REQUIRED;
// Get a list of mods
std::list<std::string> mods_unsorted, mods_sorted;
getServer(L)->getModNames(mods_unsorted);
// Take unsorted items from mods_unsorted and sort them into
// mods_sorted; not great performance but the number of mods on a
// server will likely be small.
for(std::list<std::string>::iterator i = mods_unsorted.begin();
i != mods_unsorted.end(); ++i)
{
bool added = false;
for(std::list<std::string>::iterator x = mods_sorted.begin();
x != mods_sorted.end(); ++x)
{
// I doubt anybody using Minetest will be using
// anything not ASCII based :)
if((*i).compare(*x) <= 0)
{
mods_sorted.insert(x, *i);
added = true;
break;
}
}
if(!added)
mods_sorted.push_back(*i);
}
// Get the table insertion function from Lua.
lua_getglobal(L, "table");
lua_getfield(L, -1, "insert");
int insertion_func = lua_gettop(L);
// Package them up for Lua
lua_newtable(L);
int new_table = lua_gettop(L);
std::list<std::string>::iterator i = mods_sorted.begin();
while(i != mods_sorted.end())
{
lua_pushvalue(L, insertion_func);
lua_pushvalue(L, new_table);
lua_pushstring(L, (*i).c_str());
if(lua_pcall(L, 2, 0, 0) != 0)
{
script_error(L, "error: %s", lua_tostring(L, -1));
}
++i;
}
return 1;
}
void FParser::spec_while()
{
int endtoken;
svalue_t eval;
if(!Section)
{
script_error("no {} section given for loop\n");
return;
}
if( (endtoken = FindOperator(0, NumTokens-1, ")")) == -1)
{
script_error("parse error in loop statement\n");
return;
}
EvaluateExpression(eval, 2, endtoken-1);
// skip if no longer valid
if(!intvalue(eval)) Rover = Script->SectionEnd(Section) + 1;
}
struct script_exp* script_exp_make_op1s(int type, const char* arg0)
{
struct script_exp* exp = script_exp_alloc();
exp->type = type;
exp->data.op1s.eval = script_symbol_check(arg0, &exp->data.op1s.argextra);
if (!exp->data.op1s.eval) {
char buffer[128];
script_exp_free(exp);
snprintf(buffer, sizeof(buffer), "Unknown symbol %s", arg0);
script_error(buffer);
return 0;
}
return exp;
}
int script_str_exec(const char *cmd)
{
int err = 0, handler = 0;
if ((err = luaL_loadstring(L, cmd)) != 0) {
return script_error(L);
}
handler = lua_gettop(L);
lua_pushcfunction(L, script_traceback);
lua_insert(L, handler);
err = lua_pcall(L, 0, LUA_MULTRET, handler);
lua_remove(L, handler);
if (err) {
return script_error(L);
}
if (strstr(cmd, "res_code = ") != NULL) {
lua_getglobal(L, "res_code");
if (lua_isnumber(L, -1)) {
return lua_tointeger(L, -1);
}
}
return SCRIPT_RC_OK;
}
svalue_t evaluate_expression(int start, int stop)
{
int i, n;
if(killscript) return nullvar; // killing the script
// possible pointless brackets
if(tokentype[start] == operator_ && tokentype[stop] == operator_)
pointless_brackets(&start, &stop);
if(start == stop) // only 1 thing to evaluate
{
return simple_evaluate(start);
}
// go through each operator in order of precedence
for(i=0; i<num_operators; i++)
{
// check backwards for the token. it has to be
// done backwards for left-to-right reading: eg so
// 5-3-2 is (5-3)-2 not 5-(3-2)
if( -1 != (n = (operators[i].direction==forward ?
find_operator_backwards : find_operator)
(start, stop, operators[i].string)) )
{
// C_Printf("operator %s, %i-%i-%i\n", operators[count].string, start, n, stop);
// call the operator function and evaluate this chunk of tokens
return operators[i].handler(start, n, stop);
}
}
if(tokentype[start] == function)
return evaluate_function(start, stop);
// error ?
{
char tempstr[1024]="";
for(i=start; i<=stop; i++)
sprintf(tempstr,"%s %s", tempstr, tokens[i]);
script_error("couldnt evaluate expression: %s\n",tempstr);
return nullvar;
}
}
struct script_exp* script_exp_make_op2fe(int type, const char* arg0, struct script_exp* arg1)
{
struct script_exp* exp = script_exp_alloc();
exp->type = type;
exp->data.op2fe.arg1 = arg1;
exp->data.op2fe.eval = script_function2_check(arg0, &exp->data.op2fe.argextra);
if (!exp->data.op2fe.eval) {
char buffer[128];
script_exp_free(exp);
snprintf(buffer, sizeof(buffer), "Unknown function %s", arg0);
script_error(buffer);
return 0;
}
return exp;
}
void FParser::OPremainder(svalue_t &result, int start, int n, int stop)
{
svalue_t left, right;
int ir;
evaluate_leftnright(start, n, stop);
if(!(ir = intvalue(right)))
script_error("divide by zero\n");
else
{
result.type = svt_int;
result.value.i = intvalue(left) % ir;
}
}
void scriptapi_create_auth(lua_State *L, const std::string &playername,
const std::string &password)
{
realitycheck(L);
assert(lua_checkstack(L, 20));
StackUnroller stack_unroller(L);
get_auth_handler(L);
lua_getfield(L, -1, "create_auth");
if(lua_type(L, -1) != LUA_TFUNCTION)
throw LuaError(L, "Authentication handler missing create_auth");
lua_pushstring(L, playername.c_str());
lua_pushstring(L, password.c_str());
if(lua_pcall(L, 2, 0, 0))
script_error(L, "error: %s", lua_tostring(L, -1));
}
void FParser::OPequals(svalue_t &result, int start, int n, int stop)
{
DFsVariable *var;
var = Script->FindVariable(Tokens[start]);
if(var)
{
EvaluateExpression(result, n+1, stop);
var->SetValue (result);
}
else
{
script_error("unknown variable '%s'\n", Tokens[start]);
}
}
