// Convert a Lua table to a map by using gluamapper.
// If the map really is an array (all the keys are indices), return true.
func table2mapinterface(luaTable *lua.LTable) (retmap map[interface{}]interface{}, isArray bool, err error) {
var (
m = make(map[interface{}]interface{})
opt = gluamapper.Option{}
indices []uint64
i, length uint64
)
// Catch a problem that may occur when converting the map value with gluamapper.ToGoValue
defer func() {
if r := recover(); r != nil {
retmap = m
err = errors.New("Could not represent Lua structure table as a map")
return
}
}()
luaTable.ForEach(func(tkey, tvalue lua.LValue) {
if i, isNum := tkey.(lua.LNumber); isNum {
indices = append(indices, uint64(i))
}
// If tkey or tvalue is an LTable, give up
m[gluamapper.ToGoValue(tkey, opt)] = gluamapper.ToGoValue(tvalue, opt)
length++
})
// Report back as a map, not an array, if there are no elements
if length == 0 {
return m, false, nil
}
// Loop through every index that must be present in an array
isAnArray := true
for i = 1; i <= length; i++ {
// The map must have this index in order to be an array
hasIt := false
for _, val := range indices {
if val == i {
hasIt = true
break
}
}
if !hasIt {
isAnArray = false
break
}
}
return m, isAnArray, nil
}
func mapper(tbl *lua.LTable) (map[interface{}]interface{}, error) {
opt := gluamapper.Option{NameFunc: gluamapper.ToUpperCamelCase}
mp, ok := gluamapper.ToGoValue(tbl, opt).(map[interface{}]interface{})
if !ok {
return nil, errors.New("arguments #1 must be a table, but got an array")
}
return mp, nil
}
func luaTemplate(L *lua.LState) int {
tpl, err := template.New("").Parse(L.CheckString(1))
if err != nil {
L.RaiseError(err.Error())
return 0
}
gomap := gluamapper.ToGoValue(L.CheckTable(2), gluamapper.Option{NameFunc: gluamapper.Id})
var buf bytes.Buffer
if err := tpl.Execute(&buf, gomap); err != nil {
L.RaiseError(err.Error())
return 0
}
L.Push(lua.LString(buf.String()))
return 1
}