// get_node_or_nil(pos)
// pos = {x=num, y=num, z=num}
int ModApiEnvMod::l_get_node_or_nil(lua_State *L)
{
GET_ENV_PTR;
// pos
v3s16 pos = read_v3s16(L, 1);
// Do it
bool pos_ok;
MapNode n = env->getMap().getNodeNoEx(pos, &pos_ok);
if (pos_ok) {
// Return node
pushnode(L, n, env->getGameDef()->ndef());
} else {
lua_pushnil(L);
}
return 1;
}
// get_node_or_nil(pos)
// pos = {x=num, y=num, z=num}
int ModApiEnvMod::l_get_node_or_nil(lua_State *L)
{
GET_ENV_PTR;
// pos
v3s16 pos = read_v3s16(L, 1);
// Do it
try{
MapNode n = env->getMap().getNode(pos);
// Return node
pushnode(L, n, env->getGameDef()->ndef());
return 1;
} catch(InvalidPositionException &e)
{
lua_pushnil(L);
return 1;
}
}
void ScriptApiNode::node_after_destruct(v3s16 p, MapNode node)
{
SCRIPTAPI_PRECHECKHEADER
int error_handler = PUSH_ERROR_HANDLER(L);
INodeDefManager *ndef = getServer()->ndef();
// Push callback function on stack
if (!getItemCallback(ndef->get(node).name.c_str(), "after_destruct"))
return;
// Call function
push_v3s16(L, p);
pushnode(L, node, ndef);
PCALL_RES(lua_pcall(L, 2, 0, error_handler));
lua_pop(L, 1); // Pop error handler
}
void scriptapi_node_after_destruct(lua_State *L, v3s16 p, MapNode node)
{
realitycheck(L);
assert(lua_checkstack(L, 20));
StackUnroller stack_unroller(L);
INodeDefManager *ndef = get_server(L)->ndef();
// Push callback function on stack
if(!get_item_callback(L, ndef->get(node).name.c_str(), "after_destruct"))
return;
// Call function
push_v3s16(L, p);
pushnode(L, node, ndef);
if(lua_pcall(L, 2, 0, 0))
script_error(L, "error: %s", lua_tostring(L, -1));
}
void
acceptandinfernexthistory(void)
{
int t0;
char *s;
done = 1;
for (t0 = histline - 2;; t0--) {
if (!(s = qgetevent(t0)))
return;
if (!metadiffer(s, (char *) line, ll))
break;
}
if (!(s = qgetevent(t0 + 1)))
return;
pushnode(bufstack, ztrdup(s));
stackhist = t0 + 1;
}
bool ScriptApiClient::on_dignode(v3s16 p, MapNode node)
{
SCRIPTAPI_PRECHECKHEADER
INodeDefManager *ndef = getClient()->ndef();
// Get core.registered_on_dignode
lua_getglobal(L, "core");
lua_getfield(L, -1, "registered_on_dignode");
// Push data
push_v3s16(L, p);
pushnode(L, node, ndef);
// Call functions
runCallbacks(2, RUN_CALLBACKS_MODE_OR);
return lua_toboolean(L, -1);
}
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();
sanity_check(lua_checkstack(L, 20));
StackUnroller stack_unroller(L);
lua_pushcfunction(L, script_error_handler);
int errorhandler = lua_gettop(L);
// Get registered_abms
lua_getglobal(L, "core");
lua_getfield(L, -1, "registered_abms");
luaL_checktype(L, -1, LUA_TTABLE);
lua_remove(L, -2); // Remove core
// Get registered_abms[m_id]
lua_pushnumber(L, m_id);
lua_gettable(L, -2);
if(lua_isnil(L, -1))
FATAL_ERROR("");
lua_remove(L, -2); // Remove registered_abms
scriptIface->setOriginFromTable(-1);
// Call action
luaL_checktype(L, -1, LUA_TTABLE);
lua_getfield(L, -1, "action");
luaL_checktype(L, -1, LUA_TFUNCTION);
lua_remove(L, -2); // Remove registered_abms[m_id]
push_v3s16(L, p);
pushnode(L, n, env->getGameDef()->ndef());
lua_pushnumber(L, active_object_count);
lua_pushnumber(L, active_object_count_wider);
int result = lua_pcall(L, 4, 0, errorhandler);
if (result)
scriptIface->scriptError(result, "LuaABM::trigger");
lua_pop(L, 1); // Pop error handler
}
bool ScriptApiNode::node_on_punch(v3s16 p, MapNode node,
ServerActiveObject *puncher)
{
SCRIPTAPI_PRECHECKHEADER
INodeDefManager *ndef = getServer()->ndef();
// Push callback function on stack
if(!getItemCallback(ndef->get(node).name.c_str(), "on_punch"))
return false;
// Call function
push_v3s16(L, p);
pushnode(L, node, ndef);
objectrefGetOrCreate(puncher);
if(lua_pcall(L, 3, 0, 0))
scriptError("error: %s", lua_tostring(L, -1));
return true;
}
bool ScriptApiNode::node_on_dig(v3s16 p, MapNode node,
ServerActiveObject *digger)
{
SCRIPTAPI_PRECHECKHEADER
int error_handler = PUSH_ERROR_HANDLER(L);
INodeDefManager *ndef = getServer()->ndef();
// Push callback function on stack
if (!getItemCallback(ndef->get(node).name.c_str(), "on_dig"))
return false;
// Call function
push_v3s16(L, p);
pushnode(L, node, ndef);
objectrefGetOrCreate(L, digger);
PCALL_RES(lua_pcall(L, 3, 0, error_handler));
lua_pop(L, 1); // Pop error handler
return true;
}
bool scriptapi_node_on_punch(lua_State *L, v3s16 p, MapNode node,
ServerActiveObject *puncher)
{
realitycheck(L);
assert(lua_checkstack(L, 20));
StackUnroller stack_unroller(L);
INodeDefManager *ndef = get_server(L)->ndef();
// Push callback function on stack
if(!get_item_callback(L, ndef->get(node).name.c_str(), "on_punch"))
return false;
// Call function
push_v3s16(L, p);
pushnode(L, node, ndef);
objectref_get_or_create(L, puncher);
if(lua_pcall(L, 3, 0, 0))
script_error(L, "error: %s", lua_tostring(L, -1));
return true;
}
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);
lua_pushcfunction(L, script_error_handler);
int errorhandler = lua_gettop(L);
// Get minetest.registered_abms
lua_getglobal(L, "minetest");
lua_getfield(L, -1, "registered_abms");
luaL_checktype(L, -1, LUA_TTABLE);
lua_remove(L, -2); // Remove "minetest"
// Get minetest.registered_abms[m_id]
lua_pushnumber(L, m_id);
lua_gettable(L, -2);
if(lua_isnil(L, -1))
assert(0);
lua_remove(L, -2); // Remove "registered_abms"
// Call action
luaL_checktype(L, -1, LUA_TTABLE);
lua_getfield(L, -1, "action");
luaL_checktype(L, -1, LUA_TFUNCTION);
lua_remove(L, -2); // Remove "registered_abms[m_id]"
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, errorhandler))
script_error(L);
lua_pop(L, 1); // Pop error handler
}
void LuaLBM::trigger(ServerEnvironment *env, v3s16 p, MapNode n)
{
ServerScripting *scriptIface = env->getScriptIface();
scriptIface->realityCheck();
lua_State *L = scriptIface->getStack();
sanity_check(lua_checkstack(L, 20));
StackUnroller stack_unroller(L);
int error_handler = PUSH_ERROR_HANDLER(L);
// Get registered_lbms
lua_getglobal(L, "core");
lua_getfield(L, -1, "registered_lbms");
luaL_checktype(L, -1, LUA_TTABLE);
lua_remove(L, -2); // Remove core
// Get registered_lbms[m_id]
lua_pushnumber(L, m_id);
lua_gettable(L, -2);
FATAL_ERROR_IF(lua_isnil(L, -1), "Entry with given id not found in registered_lbms table");
lua_remove(L, -2); // Remove registered_lbms
scriptIface->setOriginFromTable(-1);
// Call action
luaL_checktype(L, -1, LUA_TTABLE);
lua_getfield(L, -1, "action");
luaL_checktype(L, -1, LUA_TFUNCTION);
lua_remove(L, -2); // Remove registered_lbms[m_id]
push_v3s16(L, p);
pushnode(L, n, env->getGameDef()->ndef());
int result = lua_pcall(L, 2, 0, error_handler);
if (result)
scriptIface->scriptError(result, "LuaLBM::trigger");
lua_pop(L, 1); // Pop error handler
}
bool ScriptApiNode::node_on_punch(v3s16 p, MapNode node,
ServerActiveObject *puncher, PointedThing pointed)
{
SCRIPTAPI_PRECHECKHEADER
lua_pushcfunction(L, script_error_handler);
int errorhandler = lua_gettop(L);
INodeDefManager *ndef = getServer()->ndef();
// Push callback function on stack
if(!getItemCallback(ndef->get(node).name.c_str(), "on_punch"))
return false;
// Call function
push_v3s16(L, p);
pushnode(L, node, ndef);
objectrefGetOrCreate(puncher);
pushPointedThing(pointed);
if(lua_pcall(L, 4, 0, errorhandler))
scriptError();
lua_pop(L, 1); // Pop error handler
return true;
}
void acceptandhold() /**/
{
pushnode(bufstack,ztrdup((char *) line));
stackcs = cs;
done = 1;
}
/* Graph reduction function. Destructively modifies the graph passed in.
*/
enum graphReductionResult
reduce_graph(struct node *root)
{
enum graphReductionResult r = UNKNOWN;
struct spine_stack *stack = NULL;
unsigned long reduction_counter = 0;
int max_redex_count = 0;
/* Used to decide what to do next:
* at an application (interior node of graph)
* you can take the left branch into subtree,
* take the right branch, or pop the node and
* go "up" the tree. */
enum Direction { DIR_LEFT, DIR_RIGHT, DIR_UP };
enum Direction dir = DIR_LEFT;
stack = new_spine_stack(64);
/* root constitutes the "dummy" root node */
root->updateable = root->left_addr;
pushnode(stack, root, 1);
D print_graph(root, 0, TOPNODE(stack)->sn);
while (STACK_NOT_EMPTY(stack))
{
int pop_stack_cnt = 1;
int performed_reduction = 0;
struct node *topnode = TOPNODE(stack);
const char *atom_name = NULL;
switch (topnode->typ)
{
case APPLICATION:
switch (dir)
{
case DIR_LEFT:
topnode->updateable = topnode->left_addr;
pushnode(stack, topnode->left, 0);
D printf("push left branch on stack, depth now %d\n", DEPTH(stack));
pop_stack_cnt = 0;
break;
case DIR_RIGHT:
topnode->updateable = topnode->right_addr;
pushnode(stack, topnode->right, 2);
D printf("push right branch on stack, depth now %d\n", DEPTH(stack));
pop_stack_cnt = 0;
break;
case DIR_UP:
break;
}
break;
case ATOM:
/* node->typ indicates a combinator, which can comprise a built-in,
* or it can comprise a mere variable. Let node->rule decide. */
if (topnode->rule && DEPTH(stack) >= (topnode->rule->required_depth + 2))
{
D {
atom_name = topnode->name;
printf("%s reduction (sn %d), stack depth %d, before: ",
topnode->name,
topnode->sn,
DEPTH(stack)
);
print_graph(root->left, topnode->sn, topnode->sn);
}
pop_stack_cnt = topnode->rule->required_depth + 1;
perform_reduction(stack);
performed_reduction = 1;
} else D {
printf("%s atom, stack depth %d, required depth %d.\n",
topnode->name,
DEPTH(stack),
topnode->rule? topnode->rule->required_depth + 2: -1
);
}
if (performed_reduction) SS;
break;
}