forked from wjvlangz/glua
/
glua.go
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/
glua.go
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/*
这是一个Go语言对lua5.1的简易binding.
实现的功能如下:
1. 可在Go中创建多个虚拟机同时执行多个脚本
2. 可以注册Go的库和函数到lua,结构方法需要转为函数才能注册。
3. go的所有参数都可以传到lua中使用,但只有bool,int*,uint*,float*,string能转为
lua的boolean,number和string类型;其他类型一律转为userdata,只能传回go程序使用。
uint32和uint64类型使用可能会有精度损失,故推荐使用int代替。
4. 支持不定参数,支持多返回值,支持lua的不定参数
另外,编译需要修改头文件路径和链接的库:
//#cgo CFLAGS: -I /usr/local/include/luajit-2.0
//#cgo LDFLAGS: -l luajit-5.1
*/
package glua
//#cgo CFLAGS: -I /usr/local/include/luajit-2.0
//#cgo LDFLAGS: -l luajit-5.1
//#include <stdlib.h>
//#include <lua.h>
//#include <lauxlib.h>
//#include <lualib.h>
//#include "gluac.h"
import "C"
import (
"errors"
"fmt"
"log"
rf "reflect"
"runtime"
"unsafe"
)
//lua的状态结构
type State struct {
s *C.lua_State // lua状态
lf []interface{} // Gfucs列表
}
// 创建新的状态
func NewState() (L *State) {
L = new(State)
L.s = C.luaL_newstate()
//L.lf = make([]interface{}, 5)
// 保存State到lua栈中
var li interface{} = L
C.SetGoState(L.s, unsafe.Pointer(&li))
// 生成metatable,用于回调Go函数
C.InitMetaTable(L.s)
// 注册回收
runtime.SetFinalizer(L, (*State).free)
log.Printf("Create %v.\n", *L)
return
}
// 打开lua的所有标准库
func (L *State) Openlibs() {
C.luaL_openlibs(L.s)
}
// 执行lua脚本
func (L *State) Dofile(fname string) (ok bool) {
fn := C.CString(fname)
defer C.free(unsafe.Pointer(fn))
if C.luaL_loadfile(L.s, fn) == 0 {
return C.lua_pcall(L.s, 0, C.LUA_MULTRET, 0) == 0
}
return false
}
// 执行lua脚本字符串
func (L *State) Dostring(str string) (ok bool) {
cs := C.CString(str)
defer C.free(unsafe.Pointer(cs))
if C.luaL_loadstring(L.s, cs) == 0 {
return C.lua_pcall(L.s, 0, C.LUA_MULTRET, 0) == 0
}
return false
}
// 注册Go库到lua
func (L *State) Register(lib *Libfuncs) (bool, error) {
libn := C.CString(lib.Libname)
defer C.free(unsafe.Pointer(libn))
// 获取GlibTable
fsize := len(lib.Funcs)
if C.GetGlibTable(L.s, libn, C.int(fsize)) != 0 {
return false, errors.New(fmt.Sprintf("Lib name(%s) is wrong.\n", lib.Libname))
}
// 设置函数
for k, v := range lib.Funcs {
// 检查函数列表
if ok, err := checkFuncInOutArgs(v); !ok {
log.Println(err)
continue
}
// 保存到State
L.lf = append(L.lf, v)
idx := len(L.lf)
kn := C.CString(k)
// 设置index到GlibTtable
C.SetGfunc(L.s, kn, C.int(idx-1))
C.free(unsafe.Pointer(kn))
}
C.lua_settop(L.s, 0)
return true, nil
}
// 调用lua中的函数,但是只能返回bool, float, string,以及其他go特殊类型,int型被转换为float返回。
func (L *State) Call(fname string, args ...interface{}) (out []interface{}, ok bool) {
fn := C.CString(fname)
defer C.free(unsafe.Pointer(fn))
top := int(C.lua_gettop(L.s))
if C.int(1) != C.FindFuncs(L.s, fn) {
ok = false
out = append(out, errors.New(fmt.Sprintf("not find the function(%s).\n", fname)))
return
}
num := len(args)
for _, arg := range args {
argt := rf.TypeOf(arg)
argv := rf.ValueOf(arg)
L.pushValueByType(argt.Kind(), &argv)
}
C.lua_call(L.s, C.int(num), C.LUA_MULTRET)
for i := top; i < int(C.lua_gettop(L.s)); i++ {
ret := L.getValueByLuaType(i)
if ret.IsValid() {
out = append(out, ret.Interface())
} else {
out = append(out, nil)
}
}
C.lua_settop(L.s, C.int(top))
ok = true
return
}
// 释放lua_stat
func (L *State) free() {
log.Printf("Free %v.\n", *L)
C.lua_close(L.s)
}
//export gofuncCallback
func gofuncCallback(gs interface{}, idx int) (rn int) {
L := gs.(*State)
defer func() {
if e := recover(); e != nil {
L.pushString(fmt.Sprintf("%v\n", e))
C.lua_error(L.s)
}
}()
fv := rf.ValueOf(L.lf[idx])
ft := rf.TypeOf(L.lf[idx])
// 获取参数
in := L.getFuncIn(ft)
out := fv.Call(in)
// 设置返回值
L.setFuncOut(ft, out)
return len(out)
}
func (L *State) getFuncIn(ft rf.Type) []rf.Value {
var in []rf.Value
var i int
for i = 0; i < ft.NumIn()-1; i++ {
in = append(in, *L.getValueByType(ft.In(i).Kind(), i))
}
switch {
case ft.IsVariadic():
ek := ft.In(i).Elem().Kind()
for ; i < int(C.lua_gettop(L.s)); i++ {
switch ek {
case rf.Interface:
in = append(in, *L.getValueByLuaType(i))
default:
in = append(in, *L.getValueByType(ek, i))
}
}
case i < ft.NumIn():
in = append(in, *L.getValueByType(ft.In(i).Kind(), i))
}
return in
}
func (L *State) getValueByLuaType(i int) (v *rf.Value) {
switch C.lua_type(L.s, C.int(i+1)) {
case C.LUA_TBOOLEAN:
v = L.getValueByType(rf.Bool, i)
case C.LUA_TNUMBER:
v = L.getValueByType(rf.Float64, i)
case C.LUA_TSTRING:
v = L.getValueByType(rf.String, i)
case C.LUA_TUSERDATA:
v = L.getValueByType(rf.Interface, i)
default:
L.pushString("Wrong parameters.")
C.lua_error(L.s)
v = nil
}
return
}
func (L *State) getValueByType(vt rf.Kind, i int) *rf.Value {
var v rf.Value
switch vt {
case rf.Bool:
v = rf.ValueOf(L.getBool(i))
case rf.Int:
v = rf.ValueOf(int(L.getInt(i)))
case rf.Int8:
v = rf.ValueOf(int8(L.getInt(i)))
case rf.Int16:
v = rf.ValueOf(int16(L.getInt(i)))
case rf.Int32:
v = rf.ValueOf(int32(L.getInt(i)))
case rf.Int64:
v = rf.ValueOf(L.getInt(i))
case rf.Uint:
v = rf.ValueOf(uint(L.getInt(i)))
case rf.Uint8:
v = rf.ValueOf(uint8(L.getInt(i)))
case rf.Uint16:
v = rf.ValueOf(uint16(L.getInt(i)))
case rf.Uint32:
v = rf.ValueOf(uint32(L.getInt(i)))
case rf.Uint64:
v = rf.ValueOf(uint64(L.getInt(i)))
case rf.String:
v = rf.ValueOf(L.getString(i))
case rf.Float32:
v = rf.ValueOf(float32(L.getNumber(i)))
case rf.Float64:
v = rf.ValueOf(L.getNumber(i))
//case rf.Uintptr, rf.Complex64, rf.Complex128, rf.Array, rf.Chan, rf.Func,
// rf.Interface, rf.Map, rf.Ptr, rf.Slice, rf.Struct, rf.UnsafePointer:
default:
v = rf.ValueOf(L.getInterface(i))
}
return &v
}
func (L *State) setFuncOut(ft rf.Type, out []rf.Value) {
C.lua_settop(L.s, 0)
for i, v := range out {
L.pushValueByType(ft.Out(i).Kind(), &v)
}
}
func (L *State) pushValueByType(vt rf.Kind, v *rf.Value) {
switch vt {
case rf.Bool:
L.pushBool(v.Bool())
case rf.Int, rf.Int8, rf.Int16, rf.Int32, rf.Int64:
L.pushInt(v.Int())
case rf.Uint, rf.Uint8, rf.Uint16, rf.Uint32, rf.Uint64:
L.pushInt(int64(v.Uint()))
case rf.String:
L.pushString(v.String())
case rf.Float32:
L.pushNumber(float64(v.Float()))
case rf.Float64:
L.pushNumber(v.Float())
//case rf.Uintptr, rf.Complex64, rf.Complex128, rf.Array, rf.Chan, rf.Func,
// rf.Interface, rf.Map, rf.Ptr, rf.Slice, rf.Struct, rf.UnsafePointer:
default:
L.pushInterface(v.Interface())
}
}
func checkFuncInOutArgs(fn interface{}) (bool, error) {
t := rf.TypeOf(fn)
if t.Kind() != rf.Func {
return false, errors.New(fmt.Sprintf("type(%v) is not a type(func).\n", t))
}
/*
// in args check
for i := 0; i < t.NumIn(); i++ {
switch t.In(i).Kind() {
case rf.Bool, rf.Int, rf.String, rf.Float32, rf.Float64,
rf.Uintptr, rf.Complex64, rf.Complex128, rf.Array, rf.Chan, // rf.Func,
rf.Interface, rf.Map, rf.Ptr, rf.Slice, rf.Struct, rf.UnsafePointer:
// do nothing
default:
return false, errors.New(fmt.Sprintf(
"in args type(%v) of func(%v) is not supported.\n", t.In(i).Kind(), t))
}
}
// out args check
for i := 0; i < t.NumOut(); i++ {
switch t.Out(i).Kind() {
case rf.Bool, rf.Int, rf.String, rf.Float32, rf.Float64,
rf.Uintptr, rf.Complex64, rf.Complex128, rf.Array, rf.Chan, // rf.Func,
rf.Interface, rf.Map, rf.Ptr, rf.Slice, rf.Struct, rf.UnsafePointer:
// do nothing
default:
return false, errors.New(fmt.Sprintf(
"out args type(%v) of func(%v) is not supported.\n", t.Out(i).Kind(), t))
}
}
*/
return true, nil
}
func (L *State) getBool(i int) (ret bool) {
return (C.lua_toboolean(L.s, C.int(i+1)) == 1)
}
func (L *State) getInt(i int) (ret int64) {
return int64(C.lua_tointeger(L.s, C.int(i+1)))
}
func (L *State) getString(i int) (ret string) {
return C.GoString(C.lua_tolstring(L.s, C.int(i+1), nil))
}
func (L *State) getNumber(i int) (ret float64) {
return float64(C.lua_tonumber(L.s, C.int(i+1)))
}
func (L *State) getInterface(i int) (ret interface{}) {
C.GetInterface(L.s, unsafe.Pointer(&ret), C.int(i+1))
return
}
func (L *State) pushBool(b bool) {
if b {
C.lua_pushboolean(L.s, 1)
} else {
C.lua_pushboolean(L.s, 0)
}
}
func (L *State) pushInt(i int64) {
C.lua_pushinteger(L.s, C.lua_Integer(i))
}
func (L *State) pushString(str string) {
cs := C.CString(str)
defer C.free(unsafe.Pointer(cs))
C.lua_pushstring(L.s, cs)
}
func (L *State) pushNumber(f float64) {
C.lua_pushnumber(L.s, C.lua_Number(f))
}
func (L *State) pushInterface(iface interface{}) {
C.SetInterface(L.s, unsafe.Pointer(&iface))
}