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-rw-r--r--src/script/cpp_api/s_base.cpp264
1 files changed, 264 insertions, 0 deletions
diff --git a/src/script/cpp_api/s_base.cpp b/src/script/cpp_api/s_base.cpp
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+++ b/src/script/cpp_api/s_base.cpp
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+/*
+Minetest
+Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License along
+with this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#include <stdio.h>
+#include <cstdarg>
+
+extern "C" {
+#include "lua.h"
+#include "lauxlib.h"
+}
+
+#include "cpp_api/s_base.h"
+#include "lua_api/l_object.h"
+#include "serverobject.h"
+
+ScriptApiBase::ScriptApiBase() :
+ m_luastackmutex(),
+#ifdef LOCK_DEBUG
+ m_locked(false),
+#endif
+ m_luastack(0),
+ m_server(0),
+ m_environment(0)
+{
+
+}
+
+
+void ScriptApiBase::realityCheck()
+{
+ int top = lua_gettop(m_luastack);
+ if(top >= 30){
+ dstream<<"Stack is over 30:"<<std::endl;
+ stackDump(dstream);
+ scriptError("Stack is over 30 (reality check)");
+ }
+}
+
+void ScriptApiBase::scriptError(const char *fmt, ...)
+{
+ va_list argp;
+ va_start(argp, fmt);
+ char buf[10000];
+ vsnprintf(buf, 10000, fmt, argp);
+ va_end(argp);
+ //errorstream<<"SCRIPT ERROR: "<<buf;
+ throw LuaError(m_luastack, buf);
+}
+
+void ScriptApiBase::stackDump(std::ostream &o)
+{
+ int i;
+ int top = lua_gettop(m_luastack);
+ for (i = 1; i <= top; i++) { /* repeat for each level */
+ int t = lua_type(m_luastack, i);
+ switch (t) {
+
+ case LUA_TSTRING: /* strings */
+ o<<"\""<<lua_tostring(m_luastack, i)<<"\"";
+ break;
+
+ case LUA_TBOOLEAN: /* booleans */
+ o<<(lua_toboolean(m_luastack, i) ? "true" : "false");
+ break;
+
+ case LUA_TNUMBER: /* numbers */ {
+ char buf[10];
+ snprintf(buf, 10, "%g", lua_tonumber(m_luastack, i));
+ o<<buf;
+ break; }
+
+ default: /* other values */
+ o<<lua_typename(m_luastack, t);
+ break;
+
+ }
+ o<<" ";
+ }
+ o<<std::endl;
+}
+
+// Push the list of callbacks (a lua table).
+// Then push nargs arguments.
+// Then call this function, which
+// - runs the callbacks
+// - removes the table and arguments from the lua stack
+// - pushes the return value, computed depending on mode
+void ScriptApiBase::runCallbacks(int nargs,RunCallbacksMode mode)
+{
+ lua_State *L = getStack();
+
+ // Insert the return value into the lua stack, below the table
+ assert(lua_gettop(L) >= nargs + 1);
+ lua_pushnil(L);
+ lua_insert(L, -(nargs + 1) - 1);
+ // Stack now looks like this:
+ // ... <return value = nil> <table> <arg#1> <arg#2> ... <arg#n>
+
+ int rv = lua_gettop(L) - nargs - 1;
+ int table = rv + 1;
+ int arg = table + 1;
+
+ luaL_checktype(L, table, LUA_TTABLE);
+
+ // Foreach
+ lua_pushnil(L);
+ bool first_loop = true;
+ while(lua_next(L, table) != 0){
+ // key at index -2 and value at index -1
+ luaL_checktype(L, -1, LUA_TFUNCTION);
+ // Call function
+ for(int i = 0; i < nargs; i++)
+ lua_pushvalue(L, arg+i);
+ if(lua_pcall(L, nargs, 1, 0))
+ scriptError("error: %s", lua_tostring(L, -1));
+
+ // Move return value to designated space in stack
+ // Or pop it
+ if(first_loop){
+ // Result of first callback is always moved
+ lua_replace(L, rv);
+ first_loop = false;
+ } else {
+ // Otherwise, what happens depends on the mode
+ if(mode == RUN_CALLBACKS_MODE_FIRST)
+ lua_pop(L, 1);
+ else if(mode == RUN_CALLBACKS_MODE_LAST)
+ lua_replace(L, rv);
+ else if(mode == RUN_CALLBACKS_MODE_AND ||
+ mode == RUN_CALLBACKS_MODE_AND_SC){
+ if((bool)lua_toboolean(L, rv) == true &&
+ (bool)lua_toboolean(L, -1) == false)
+ lua_replace(L, rv);
+ else
+ lua_pop(L, 1);
+ }
+ else if(mode == RUN_CALLBACKS_MODE_OR ||
+ mode == RUN_CALLBACKS_MODE_OR_SC){
+ if((bool)lua_toboolean(L, rv) == false &&
+ (bool)lua_toboolean(L, -1) == true)
+ lua_replace(L, rv);
+ else
+ lua_pop(L, 1);
+ }
+ else
+ assert(0);
+ }
+
+ // Handle short circuit modes
+ if(mode == RUN_CALLBACKS_MODE_AND_SC &&
+ (bool)lua_toboolean(L, rv) == false)
+ break;
+ else if(mode == RUN_CALLBACKS_MODE_OR_SC &&
+ (bool)lua_toboolean(L, rv) == true)
+ break;
+
+ // value removed, keep key for next iteration
+ }
+
+ // Remove stuff from stack, leaving only the return value
+ lua_settop(L, rv);
+
+ // Fix return value in case no callbacks were called
+ if(first_loop){
+ if(mode == RUN_CALLBACKS_MODE_AND ||
+ mode == RUN_CALLBACKS_MODE_AND_SC){
+ lua_pop(L, 1);
+ lua_pushboolean(L, true);
+ }
+ else if(mode == RUN_CALLBACKS_MODE_OR ||
+ mode == RUN_CALLBACKS_MODE_OR_SC){
+ lua_pop(L, 1);
+ lua_pushboolean(L, false);
+ }
+ }
+}
+
+void ScriptApiBase::addObjectReference(ServerActiveObject *cobj)
+{
+ SCRIPTAPI_PRECHECKHEADER
+ //infostream<<"scriptapi_add_object_reference: id="<<cobj->getId()<<std::endl;
+
+ // Create object on stack
+ ObjectRef::create(L, cobj); // Puts ObjectRef (as userdata) on stack
+ int object = lua_gettop(L);
+
+ // Get minetest.object_refs table
+ lua_getglobal(L, "minetest");
+ lua_getfield(L, -1, "object_refs");
+ luaL_checktype(L, -1, LUA_TTABLE);
+ int objectstable = lua_gettop(L);
+
+ // object_refs[id] = object
+ lua_pushnumber(L, cobj->getId()); // Push id
+ lua_pushvalue(L, object); // Copy object to top of stack
+ lua_settable(L, objectstable);
+}
+
+void ScriptApiBase::removeObjectReference(ServerActiveObject *cobj)
+{
+ SCRIPTAPI_PRECHECKHEADER
+ //infostream<<"scriptapi_rm_object_reference: id="<<cobj->getId()<<std::endl;
+
+ // Get minetest.object_refs table
+ lua_getglobal(L, "minetest");
+ lua_getfield(L, -1, "object_refs");
+ luaL_checktype(L, -1, LUA_TTABLE);
+ int objectstable = lua_gettop(L);
+
+ // Get object_refs[id]
+ lua_pushnumber(L, cobj->getId()); // Push id
+ lua_gettable(L, objectstable);
+ // Set object reference to NULL
+ ObjectRef::set_null(L);
+ lua_pop(L, 1); // pop object
+
+ // Set object_refs[id] = nil
+ lua_pushnumber(L, cobj->getId()); // Push id
+ lua_pushnil(L);
+ lua_settable(L, objectstable);
+}
+
+// Creates a new anonymous reference if cobj=NULL or id=0
+void ScriptApiBase::objectrefGetOrCreate(
+ ServerActiveObject *cobj)
+{
+ lua_State *L = getStack();
+
+ if(cobj == NULL || cobj->getId() == 0){
+ ObjectRef::create(L, cobj);
+ } else {
+ objectrefGet(cobj->getId());
+ }
+}
+
+void ScriptApiBase::objectrefGet(u16 id)
+{
+ lua_State *L = getStack();
+
+ // Get minetest.object_refs[i]
+ lua_getglobal(L, "minetest");
+ lua_getfield(L, -1, "object_refs");
+ luaL_checktype(L, -1, LUA_TTABLE);
+ lua_pushnumber(L, id);
+ lua_gettable(L, -2);
+ lua_remove(L, -2); // object_refs
+ lua_remove(L, -2); // minetest
+}