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lua.go
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lua.go
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// The lua package allows scripting the game using the Lua language.
package lua
import (
"fmt"
goz "github.com/20tab/gozmo"
)
type Lua struct {
state *lua.LState
}
func NewLua(fileName string) *Lua {
l := Lua{}
ls := lua.NewState()
l.state = ls
err := ls.DoFile(fileName)
if err != nil {
panic(err)
}
mt := ls.NewTypeMetatable("gameobject")
ls.SetField(mt, "__index", ls.SetFuncs(ls.NewTable(), gameobjectMethods))
return &l
}
func gameobjectCheck(L *lua.LState) *goz.GameObject {
ud := L.CheckUserData(1)
if v, ok := ud.Value.(*goz.GameObject); ok {
return v
}
L.ArgError(1, "gameobject expected")
return nil
}
func gameobjectGetAttr(L *lua.LState) int {
if L.GetTop() != 3 {
L.ArgError(1, "invalid args")
return 0
}
g := gameobjectCheck(L)
v, err := g.GetAttr(L.CheckString(2), L.CheckString(3))
if err != nil {
fmt.Println(err)
return 0
}
switch v.(type) {
case string:
L.Push(lua.LString(v.(string)))
return 1
case float32:
L.Push(lua.LNumber(v.(float32)))
return 1
case bool:
L.Push(lua.LBool(v.(bool)))
return 1
}
return 0
}
func gameobjectSetAttr(L *lua.LState) int {
if L.GetTop() != 4 {
L.ArgError(1, "invalid args")
return 0
}
g := gameobjectCheck(L)
v := L.CheckAny(4)
var err error
switch v.(type) {
case lua.LNumber:
err = g.SetAttr(L.CheckString(2), L.CheckString(3), float32(lua.LVAsNumber(v)))
case lua.LString:
err = g.SetAttr(L.CheckString(2), L.CheckString(3), lua.LVAsString(v))
}
if err != nil {
fmt.Println(err)
}
return 0
}
var gameobjectMethods = map[string]lua.LGFunction{
"getattr": gameobjectGetAttr,
"setattr": gameobjectSetAttr,
}
func (l *Lua) Start(g *goz.GameObject) {
L := l.state
ud := L.NewUserData()
ud.Value = g
L.SetMetatable(ud, L.GetTypeMetatable("gameobject"))
p := lua.P{Fn: L.GetGlobal("start"), NRet: 0, Protect: true}
err := L.CallByParam(p, ud)
if err != nil {
fmt.Println(err)
}
}
func (l *Lua) Update(g *goz.GameObject) {
L := l.state
ud := L.NewUserData()
ud.Value = g
L.SetMetatable(ud, L.GetTypeMetatable("gameobject"))
p := lua.P{Fn: L.GetGlobal("update"), NRet: 0, Protect: true}
err := L.CallByParam(p, ud)
if err != nil {
fmt.Println(err)
}
}