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@ -34,18 +34,33 @@ distribution.
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#include <lua.h>
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#include <lauxlib.h>
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namespace DFHack { namespace Lua {
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namespace DFHack {
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class function_identity_base;
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}
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namespace DFHack {namespace Lua {
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/**
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* Create or initialize a lua interpreter with access to DFHack tools.
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*/
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DFHACK_EXPORT lua_State *Open(color_ostream &out, lua_State *state = NULL);
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/**
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* Load a module using require().
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* Load a module using require(). Leaves the stack as is.
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*/
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DFHACK_EXPORT bool Require(color_ostream &out, lua_State *state,
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const std::string &module, bool setglobal = false);
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/**
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* Push the module table, loading it using require() if necessary.
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*/
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DFHACK_EXPORT bool PushModule(color_ostream &out, lua_State *state, const char *module);
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/**
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* Push the public object name exported by the module. Uses PushModule.
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*/
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DFHACK_EXPORT bool PushModulePublic(color_ostream &out, lua_State *state,
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const char *module, const char *name);
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/**
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* Check if the object at the given index is NIL or NULL.
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*/
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@ -79,6 +94,12 @@ namespace DFHack { namespace Lua {
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*/
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DFHACK_EXPORT void *GetDFObject(lua_State *state, type_identity *type, int val_index, bool exact_type = false);
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/**
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* Check that the value is a wrapped DF object of the given type, and if so return the pointer.
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* Otherwise throw an argument type error.
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*/
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DFHACK_EXPORT void *CheckDFObject(lua_State *state, type_identity *type, int val_index, bool exact_type = false);
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/**
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* Assign the value at val_index to the target of given identity using df.assign().
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* Return behavior is of SafeCall below.
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@ -102,6 +123,14 @@ namespace DFHack { namespace Lua {
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return (T*)GetDFObject(state, df::identity_traits<T>::get(), val_index, exact_type);
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}
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/**
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* Check that the value is a wrapped DF object of the correct type, and if so return the pointer. Otherwise throw an argument type error.
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*/
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template<class T>
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T *CheckDFObject(lua_State *state, int val_index, bool exact_type = false) {
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return (T*)CheckDFObject(state, df::identity_traits<T>::get(), val_index, exact_type);
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}
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/**
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* Assign the value at val_index to the target using df.assign().
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*/
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@ -110,12 +139,56 @@ namespace DFHack { namespace Lua {
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return AssignDFObject(out, state, df::identity_traits<T>::get(), target, val_index, perr);
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}
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/**
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* Check if the status is a success, i.e. LUA_OK or LUA_YIELD.
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*/
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inline bool IsSuccess(int status) {
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return (status == LUA_OK || status == LUA_YIELD);
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}
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// Internal helper
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template<int (*cb)(lua_State*,int,int)>
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int TailPCallK_Thunk(lua_State *state) {
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int tmp;
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int rv = lua_getctx(state, &tmp);
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return cb(state, rv, tmp);
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}
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/**
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* A utility for using the restartable pcall feature more conveniently;
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* specifically, the callback is called with the same kind of arguments
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* in both yield and non-yield case.
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*/
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template<int (*cb)(lua_State*,int,int)>
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int TailPCallK(lua_State *state, int narg, int nret, int errfun, int ctx) {
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int rv = lua_pcallk(state, narg, nret, errfun, ctx, &TailPCallK_Thunk<cb>);
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return cb(state, rv, ctx);
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}
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/**
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* Invoke lua function via pcall. Returns true if success.
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* If an error is signalled, and perr is true, it is printed and popped from the stack.
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*/
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DFHACK_EXPORT bool SafeCall(color_ostream &out, lua_State *state, int nargs, int nres, bool perr = true);
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/**
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* Pops a function from the top of the stack, and pushes a new coroutine.
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*/
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DFHACK_EXPORT lua_State *NewCoroutine(lua_State *state);
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/**
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* Resume the coroutine using nargs values from state from. Results or the error are moved back.
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* If an error is signalled, and perr is true, it is printed and popped from the stack.
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* Returns the lua_resume return value.
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*/
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DFHACK_EXPORT int SafeResume(color_ostream &out, lua_State *from, lua_State *thread, int nargs, int nres, bool perr = true);
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/**
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* Works just like SafeCall, only expects a coroutine on the stack
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* instead of a function. Returns the lua_resume return value.
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*/
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DFHACK_EXPORT int SafeResume(color_ostream &out, lua_State *from, int nargs, int nres, bool perr = true);
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/**
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* Parse code from string with debug_tag and env_idx, then call it using SafeCall.
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* In case of error, it is either left on the stack, or printed like SafeCall does.
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@ -131,8 +204,168 @@ namespace DFHack { namespace Lua {
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/**
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* Run an interactive interpreter loop if possible, or return false.
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* Uses RunCoreQueryLoop internally.
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*/
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DFHACK_EXPORT bool InterpreterLoop(color_ostream &out, lua_State *state,
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const char *prompt = NULL, int env = 0, const char *hfile = NULL);
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const char *prompt = NULL, const char *hfile = NULL);
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/**
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* Run an interactive prompt loop. All access to the lua state
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* is done inside CoreSuspender, while waiting for input happens
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* without the suspend lock.
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*/
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DFHACK_EXPORT bool RunCoreQueryLoop(color_ostream &out, lua_State *state,
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bool (*init)(color_ostream&, lua_State*, void*),
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void *arg);
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/**
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* Push utility functions
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*/
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#if 0
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#define NUMBER_PUSH(type) inline void Push(lua_State *state, type value) { lua_pushnumber(state, value); }
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NUMBER_PUSH(char)
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NUMBER_PUSH(int8_t) NUMBER_PUSH(uint8_t)
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NUMBER_PUSH(int16_t) NUMBER_PUSH(uint16_t)
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NUMBER_PUSH(int32_t) NUMBER_PUSH(uint32_t)
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NUMBER_PUSH(int64_t) NUMBER_PUSH(uint64_t)
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NUMBER_PUSH(float) NUMBER_PUSH(double)
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#undef NUMBER_PUSH
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#else
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template<class T> inline void Push(lua_State *state, T value) {
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lua_pushnumber(state, lua_Number(value));
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}
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#endif
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inline void Push(lua_State *state, bool value) {
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lua_pushboolean(state, value);
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}
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inline void Push(lua_State *state, const std::string &str) {
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lua_pushlstring(state, str.data(), str.size());
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}
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inline void Push(lua_State *state, df::coord &obj) { PushDFObject(state, &obj); }
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inline void Push(lua_State *state, df::coord2d &obj) { PushDFObject(state, &obj); }
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template<class T> inline void Push(lua_State *state, T *ptr) {
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PushDFObject(state, ptr);
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}
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template<class T>
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void PushVector(lua_State *state, const T &pvec)
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{
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lua_createtable(state,pvec.size(),0);
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for (size_t i = 0; i < pvec.size(); i++)
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{
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Push(state, pvec[i]);
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lua_rawseti(state, -2, i+1);
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}
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}
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DFHACK_EXPORT int PushPosXYZ(lua_State *state, df::coord pos);
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DFHACK_EXPORT bool IsCoreContext(lua_State *state);
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DFHACK_EXPORT int NewEvent(lua_State *state);
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DFHACK_EXPORT void MakeEvent(lua_State *state, void *key);
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DFHACK_EXPORT void InvokeEvent(color_ostream &out, lua_State *state, void *key, int num_args);
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/**
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* Namespace for the common lua interpreter state.
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* All accesses must be done under CoreSuspender.
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*/
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namespace Core {
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DFHACK_EXPORT extern lua_State *State;
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// Not exported; for use by the Core class
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void Init(color_ostream &out);
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void Reset(color_ostream &out, const char *where);
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// Events signalled by the core
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void onStateChange(color_ostream &out, int code);
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template<class T> inline void Push(T &arg) { Lua::Push(State, arg); }
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template<class T> inline void Push(const T &arg) { Lua::Push(State, arg); }
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template<class T> inline void PushVector(const T &arg) { Lua::PushVector(State, arg); }
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inline bool SafeCall(color_ostream &out, int nargs, int nres, bool perr = true) {
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return Lua::SafeCall(out, State, nargs, nres, perr);
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}
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inline bool PushModule(color_ostream &out, const char *module) {
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return Lua::PushModule(out, State, module);
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}
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inline bool PushModulePublic(color_ostream &out, const char *module, const char *name) {
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return Lua::PushModulePublic(out, State, module, name);
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}
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}
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class DFHACK_EXPORT Notification {
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lua_State *state;
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void *key;
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function_identity_base *handler;
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public:
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Notification(function_identity_base *handler = NULL)
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: state(NULL), key(NULL), handler(handler) {}
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lua_State *get_state() { return state; }
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function_identity_base *get_handler() { return handler; }
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void invoke(color_ostream &out, int nargs);
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void bind(lua_State *state, const char *name);
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void bind(lua_State *state, void *key);
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};
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}}
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#define DEFINE_LUA_EVENT_0(name, handler) \
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static DFHack::Lua::Notification name##_event(df::wrap_function(handler, true)); \
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void name(color_ostream &out) { \
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handler(out); \
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if (name##_event.get_state()) { \
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name##_event.invoke(out, 0); \
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} \
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}
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#define DEFINE_LUA_EVENT_1(name, handler, arg_type1) \
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static DFHack::Lua::Notification name##_event(df::wrap_function(handler, true)); \
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void name(color_ostream &out, arg_type1 arg1) { \
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handler(out, arg1); \
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if (auto state = name##_event.get_state()) { \
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DFHack::Lua::Push(state, arg1); \
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name##_event.invoke(out, 1); \
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} \
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}
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#define DEFINE_LUA_EVENT_2(name, handler, arg_type1, arg_type2) \
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static DFHack::Lua::Notification name##_event(df::wrap_function(handler, true)); \
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void name(color_ostream &out, arg_type1 arg1, arg_type2 arg2) { \
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handler(out, arg1, arg2); \
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if (auto state = name##_event.get_state()) { \
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DFHack::Lua::Push(state, arg1); \
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DFHack::Lua::Push(state, arg2); \
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name##_event.invoke(out, 2); \
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} \
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}
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#define DEFINE_LUA_EVENT_3(name, handler, arg_type1, arg_type2, arg_type3) \
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static DFHack::Lua::Notification name##_event(df::wrap_function(handler, true)); \
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void name(color_ostream &out, arg_type1 arg1, arg_type2 arg2, arg_type3 arg3) { \
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handler(out, arg1, arg2, arg3); \
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if (auto state = name##_event.get_state()) { \
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DFHack::Lua::Push(state, arg1); \
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DFHack::Lua::Push(state, arg2); \
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DFHack::Lua::Push(state, arg3); \
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name##_event.invoke(out, 3); \
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} \
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}
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#define DEFINE_LUA_EVENT_4(name, handler, arg_type1, arg_type2, arg_type3, arg_type4) \
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static DFHack::Lua::Notification name##_event(df::wrap_function(handler, true)); \
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void name(color_ostream &out, arg_type1 arg1, arg_type2 arg2, arg_type3 arg3, arg_type4 arg4) { \
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handler(out, arg1, arg2, arg3, arg4); \
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if (auto state = name##_event.get_state()) { \
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DFHack::Lua::Push(state, arg1); \
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DFHack::Lua::Push(state, arg2); \
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DFHack::Lua::Push(state, arg3); \
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DFHack::Lua::Push(state, arg4); \
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name##_event.invoke(out, 4); \
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} \
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}
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Kelly Martin