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Dogcows Code - chaz/yoink/blob - src/Moof/Script.hh
df00619d69e59b4dafcf644d5782e2ab53ac1eac
2 /*******************************************************************************
4 Copyright (c) 2009, Charles McGarvey
7 Redistribution and use in source and binary forms, with or without
8 modification, are permitted provided that the following conditions are met:
10 * Redistributions of source code must retain the above copyright notice,
11 this list of conditions and the following disclaimer.
12 * Redistributions in binary form must reproduce the above copyright notice,
13 this list of conditions and the following disclaimer in the documentation
14 and/or other materials provided with the distribution.
16 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19 DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
20 FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
22 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
23 CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
25 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *******************************************************************************/
29 #ifndef _MOOF_SCRIPT_HH_
30 #define _MOOF_SCRIPT_HH_
34 * A thin wrapper over Lua. This is not meant as a complicated binding package
35 * between C++ and Lua. It does not try to make the boundary invisible. It
36 * does not hide the concept of the Lua stack, but rather provides that
37 * mechanism with a certain level of abstraction while also providing a cleaner,
38 * more consistent API.
46 #include <boost/bind.hpp>
47 #include <boost/function.hpp>
48 #include <boost/shared_ptr.hpp>
52 #include <Moof/Log.hh>
59 typedef boost::shared_ptr
<Script
> ScriptP
;
66 typedef boost::function
<int(Script
&)> Function
;
72 BOOLEAN
= LUA_TBOOLEAN
,
73 LIGHTUSERDATA
= LUA_TLIGHTUSERDATA
,
77 FUNCTION
= LUA_TFUNCTION
,
78 USERDATA
= LUA_TUSERDATA
,
86 RUNTIME_ERROR
= LUA_ERRRUN
,
87 SYNTAX_ERROR
= LUA_ERRSYNTAX
,
88 MEMORY_ERROR
= LUA_ERRMEM
,
89 HANDLER_ERROR
= LUA_ERRERR
,
90 FILE_ERROR
= LUA_ERRFILE
95 REGISTRY
= LUA_REGISTRYINDEX
,
96 ENVIRONMENT
= LUA_ENVIRONINDEX
,
97 GLOBALS
= LUA_GLOBALSINDEX
101 * This is the most prominent abstraction on top of the standard Lua API.
102 * A Value object represents a value on the stack. More specifically, it
103 * represents a position on the stack. The distinction is only important
104 * when values are moved around on the stack or if the Value represents a
105 * negative index on the stack (the value of which will change as things are
106 * pushed onto and popped from the stack).
112 * You have direct access to the index of the value on the stack being
120 * A default-constructed Value is invalid until a valid Value is
121 * assigned to it. The only method that should be called on such a
122 * Value is isValid(), otherwise chaos may ensue. In this case, the
123 * Value will be invalid even if index is manually changed to a valid
124 * index. You have to index the script itself to get a valid Value.
126 Value(lua_State
* s
= 0, int i
= 0) :
131 * A copied value presently points to the same value, except the real
132 * index is used. That means that if a value that refers to a frame
133 * referenced from the top of the stack will have its normalized index
134 * copied into the new value object.
137 Value(const Value
& copy
) :
138 index(copy
.getRealIndex()),
142 // check the type of the value
143 bool isBoolean() const { return (bool)lua_isboolean(state
, index
); }
144 bool isFunction() const { return (bool)lua_isfunction(state
, index
); }
145 bool isNil() const { return (bool)lua_isnil(state
, index
); }
146 bool isNone() const { return (bool)lua_isnone(state
, index
); }
147 bool isValid() const { return state
!= 0 && !isNone(); }
148 bool isNoneOrNil() const { return (bool)lua_isnoneornil(state
, index
); }
149 bool isNumber() const { return (bool)lua_isnumber(state
, index
); }
150 bool isString() const { return (bool)lua_isstring(state
, index
); }
151 bool isTable() const { return (bool)lua_istable(state
, index
); }
152 bool isThread() const { return (bool)lua_isthread(state
, index
); }
153 bool isData() const { return (bool)lua_isuserdata(state
, index
); }
154 bool isLightData() const { return (bool)lua_islightuserdata(state
, index
); }
157 * Check the value and throw an error if its the wrong type. There's a
158 * little caveat: This method never returns because it does a long jump.
159 * Consequently, constructed C++ objects which exist on the stack
160 * between the current frame and some lua function will not be
161 * destructed. That's not a problem for objects that only exist on the
162 * stack, but any objects that allocate memory on the heap (such as
163 * containers or strings) will leak. Therefore, you should only call
164 * this method after cleaning up such objects. The best thing to do for
165 * defining functions is to simply check all the parameters at the
166 * get-go before any C++ objects are even constructed.
169 void requireType(Type type
) const
171 if (type
!= getType())
173 luaL_typerror(state
, index
, lua_typename(state
, type
));
177 void throwError(const char* error
)
179 luaL_argerror(state
, index
, error
);
183 Value
& requireBoolean()
185 if (!isBoolean()) luaL_typerror(state
, index
, "boolean");
188 Value
& requireNumber()
190 if (!isNumber()) luaL_typerror(state
, index
, "number");
193 Value
& requireString()
195 if (!isString()) luaL_typerror(state
, index
, "string");
198 Value
& requireTable()
200 if (!isTable()) luaL_typerror(state
, index
, "table");
203 Value
& requireFunction()
205 if (!isFunction()) luaL_typerror(state
, index
, "function");
210 if (!isData()) luaL_typerror(state
, index
, "data");
215 if (!isNil()) luaL_typerror(state
, index
, "nil");
218 Value
& requireThread()
220 if (!isThread()) luaL_typerror(state
, index
, "thread");
226 * Get the type of the value.
231 return (Type
)lua_type(state
, index
);
235 * Get the name of the type of the value as a string.
238 std::string
getTypeName() const
240 return std::string(luaL_typename(state
, index
));
245 * Get the length of the value according to the definition given by Lua.
248 size_t getLength() const
250 return lua_objlen(state
, index
);
253 int getRealIndex() const
255 if (index
< 0) return lua_gettop(state
) + 1 + index
;
261 * Get a pointer value (for userdata, tables, threads, and functions).
264 const void* getIdentifier() const
266 return lua_topointer(state
, index
);
270 bool operator == (const Value
& rhs
) const
272 return (bool)lua_equal(state
, index
, rhs
.index
);
274 bool operator != (const Value
& rhs
) const
276 return !(*this == rhs
);
278 bool operator < (const Value
& rhs
) const
280 return (bool)lua_lessthan(state
, index
, rhs
.index
);
282 bool operator <= (const Value
& rhs
) const
284 return *this < rhs
|| *this == rhs
;
286 bool operator > (const Value
& rhs
) const
288 return !(*this <= rhs
);
290 bool operator >= (const Value
& rhs
) const
292 return !(*this < rhs
);
294 operator bool () const
296 return (bool)lua_toboolean(state
, index
);
299 Value
& operator = (const Value
& rhs
)
308 * Convert the underlying value to a C++ type.
311 template <typename T
>
312 bool get(T
& value
) const
316 value
= (T
)lua_tointeger(state
, index
);
322 bool get(float& value
) const
326 value
= (float)lua_tonumber(state
, index
);
331 bool get(double& value
) const
335 value
= (double)lua_tonumber(state
, index
);
341 bool get(bool& value
) const
345 value
= (bool)lua_toboolean(state
, index
);
351 bool get(std::string
& value
) const
356 const char* str
= lua_tolstring(state
, index
, &size
);
357 value
.assign(str
, size
);
363 template <typename T
>
364 bool get(std::vector
<T
>& array
) const
366 if (!isTable()) return false;
370 Value
value(state
, -1);
371 int realIndex
= getRealIndex();
374 for (int i
= 1; !done
; ++i
)
376 lua_rawgeti(state
, realIndex
, i
);
379 if (value
.get(v
)) array
.push_back(v
);
388 template <typename T
>
389 bool get(std::map
<std::string
,T
>& dictionary
) const
391 if (!isTable()) return false;
395 Value
key(state
, -2);
396 Value
value(state
, -1);
397 int realIndex
= getRealIndex();
400 while (lua_next(state
, realIndex
) != 0)
403 if (!key
.isNumber() && key
.get(k
))
406 if (value
.get(v
)) dictionary
[k
] = v
;
418 * Copy the value and push the copy to the stack.
421 void pushCopy() const
423 lua_pushvalue(state
, index
);
427 * Replace this value with the value at the top of the stack.
430 void replaceWithTop()
432 lua_replace(state
, index
);
437 lua_remove(state
, index
);
441 * Inserts the top-most value on the stack at position index, shifting other
447 lua_insert(state
, index
);
451 void pushMetatable() const
453 lua_getmetatable(state
, index
);
456 void pushField() const
458 lua_gettable(state
, index
);
461 void pushField(const std::string
& name
) const
463 lua_getfield(state
, index
, name
.c_str());
474 mState(luaL_newstate())
476 lua_pushlightuserdata(mState
, this);
477 lua_setfield(mState
, LUA_REGISTRYINDEX
, "_script_obj");
482 if (mIsMainThread
) lua_close(mState
);
486 static ScriptP
alloc()
488 return ScriptP(new Script
);
492 void importStandardLibraries()
494 luaL_openlibs(mState
);
497 void importFunction(const std::string
& name
, const Function
& function
)
500 lua_setglobal(mState
, name
.c_str());
504 Status
doString(const std::string
& commands
)
506 return (Status
)luaL_dostring(mState
, commands
.c_str());
509 Status
doFile(const std::string
& file
)
511 return (Status
)luaL_dofile(mState
, file
.c_str());
516 * Thread-handling methods.
519 Script
pushNewThread()
521 return Script(mState
);
526 lua_pushthread(mState
);
529 Status
resume(int nargs
)
531 return (Status
)lua_resume(mState
, nargs
);
534 Status
getStatus() const
536 return (Status
)lua_status(mState
);
539 int yield(int results
)
541 return lua_yield(mState
, results
);
544 bool isMainThread() const
546 return mIsMainThread
;
551 * Throw an error with the value at the top of the stack. This method never
552 * returns because it does a long jump. Consequently, constructed C++
553 * objects which exist on the stack between the current frame and some lua
554 * function will not be destructed. That's not a problem for objects that
555 * only exist on the stack, but any objects that allocate memory on the heap
556 * (such as containers or strings) will leak. Therefore, you should only
557 * call this method after cleaning up such objects.
567 * Get significant values.
570 Value
getGlobalTable() const
572 return Value(mState
, GLOBALS
);
575 Value
getRegistryTable() const
577 return Value(mState
, REGISTRY
);
580 Value
getEnvironmentTable() const
582 return Value(mState
, ENVIRONMENT
);
587 return Value(mState
, lua_gettop(mState
));
591 * Get the size of the stack; this is also the index of the top-most value.
596 return lua_gettop(mState
);
599 void setSize(int size
)
601 lua_settop(mState
, size
);
611 * Makes sure there is at least extra more places on the stack. Returns
612 * false if space couldn't be created. Just like with the regular Lua API,
613 * you are responsible to make sure the stack is big enough to hold whatever
614 * you want to push on it. This is usually only an issue if you're pushing
618 bool checkStack(int extra
)
620 return (bool)lua_checkstack(mState
, extra
);
625 * Concatenates the top-most n values on the stack.
630 lua_concat(mState
, n
);
635 * Push some values onto the stack.
638 template <typename T
>
641 lua_pushinteger(mState
, lua_Integer(value
));
644 void push(bool value
)
646 lua_pushboolean(mState
, int(value
));
649 void push(float value
)
651 lua_pushnumber(mState
, (lua_Number
)value
);
653 void push(double value
)
655 lua_pushnumber(mState
, (lua_Number
)value
);
658 void push(const std::string
& value
)
660 lua_pushlstring(mState
, value
.c_str(), value
.length());
662 void push(const char* value
)
664 lua_pushstring(mState
, value
);
666 void push(const char* value
, size_t length
)
668 lua_pushlstring(mState
, value
, length
);
671 void push(const Function
& function
)
673 mFunctions
.push_back(function
);
675 lua_pushlightuserdata(mState
, (void*)&mFunctions
.back());
676 lua_pushcclosure(mState
, dispatchCall
, 1);
679 void push(void* data
)
681 lua_pushlightuserdata(mState
, data
);
689 void pushFromThread(Script
& thread
, int n
)
691 lua_xmove(thread
.mState
, mState
, n
);
694 Status
pushCode(const std::string
& filename
)
696 return (Status
)luaL_loadfile(mState
, filename
.c_str());
699 Status
pushCode(const std::string
& name
, const char* buffer
, size_t size
)
701 return (Status
)luaL_loadbuffer(mState
, buffer
, size
, name
.c_str());
704 void* pushNewData(size_t size
)
706 return lua_newuserdata(mState
, size
);
711 lua_newtable(mState
);
716 * Call a function on the stack. The correct procedure is to push a
717 * function onto the stack followed by nargs arguments. This method will
718 * pop them off upon return, leaving up to nresults return values (default
719 * is any number of return values, depending on the callee).
722 Status
call(int nargs
, int nresults
= LUA_MULTRET
)
724 return (Status
)lua_pcall(mState
, nargs
, nresults
, 0);
729 * Pops n values from the top of the stack.
739 * Index into the stack to get a Value.
742 Value
operator [] (int index
) const
744 return Value(mState
, index
);
749 * Getting and setting fields of a table.
752 void get(const std::string
& field
, int index
= GLOBALS
) const
754 lua_getfield(mState
, index
, field
.c_str());
757 void set(const std::string
& field
, int index
= GLOBALS
)
759 lua_setfield(mState
, index
, field
.c_str());
764 * Control over the garbage collection process.
769 lua_gc(mState
, LUA_GCCOLLECT
, 0);
774 lua_gc(mState
, LUA_GCSTOP
, 0);
777 void restartCollector()
779 lua_gc(mState
, LUA_GCRESTART
, 0);
782 int getUsedMemory() const
785 return lua_gc(mState
, LUA_GCCOUNT
, 0);
788 void collectStep(int step
)
790 lua_gc(mState
, LUA_GCSTEP
, step
);
793 void tuneCollector(int pause
, int step
)
795 lua_gc(mState
, LUA_GCSETPAUSE
, pause
);
796 lua_gc(mState
, LUA_GCSETSTEPMUL
, step
);
802 Script(lua_State
* state
) :
803 mState(lua_newthread(state
)),
804 mIsMainThread(false) {}
806 static int dispatchCall(lua_State
* state
)
808 const Function
* function
= (const Function
*)lua_touserdata(state
,
809 lua_upvalueindex(1));
811 lua_getfield(state
, LUA_REGISTRYINDEX
, "_script_obj");
812 Script
* script
= (Script
*)lua_touserdata(state
, -1);
815 return (*function
)(*script
);
820 std::list
<Function
> mFunctions
;
826 #endif // _MOOF_SCRIPT_HH_
828 /** vim: set ts=4 sw=4 tw=80: *************************************************/
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