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|
package main
import (
"reflect"
"slices"
"fmt"
"runtime/cgo"
)
// Scan scans values from the Lua stack into vars according to their types.
func (l *Lua) Scan(vars ...any) error {
slices.Reverse(vars)
for i, v := range vars {
t := reflect.TypeOf(v)
// unwrap pointers
for t.Kind() == reflect.Ptr {
t = t.Elem()
}
tk := t.Kind()
if t.Name() == "LuaRef" {
if l.IsFunction(-1) == false {
return fmt.Errorf(
"passed arg #%d must be function",
len(vars)-i,
)
}
*v.(*LuaRef) = l.PopToRef()
} else if t.String() == "cgo.Handle" {
if l.IsNumber(-1) == false {
return fmt.Errorf(
"passed arg #%d must be Go handler",
len(vars)-i,
)
}
*v.(*cgo.Handle) = cgo.Handle(uintptr(l.ToInt(-1)))
l.Pop(1)
} else if tk == reflect.String {
if l.IsString(-1) == false {
return fmt.Errorf(
"passed arg #%d must be string",
len(vars)-i,
)
}
*v.(*string) = l.ToString(-1)
l.Pop(1)
} else if tk == reflect.Int {
if l.IsNumber(-1) == false {
return fmt.Errorf(
"passed arg #%d must be number",
len(vars)-i,
)
}
*v.(*int) = l.ToInt(-1)
l.Pop(1)
} else if tk == reflect.Map && t.Key().Kind() == reflect.String {
// TODO: should be possible to use maps with any types
// of value, not only strings.
vm, _ := v.(*map[string]string)
l.PushNil()
for l.Next() {
if !l.IsString(-1) {
return fmt.Errorf(
"map arg #%d must only have string values",
len(vars)-i,
)
}
if !l.IsString(-2) {
return fmt.Errorf(
"map arg #%d must only have string keys",
len(vars)-i,
)
}
v := l.ToString(-1)
l.Pop(1)
// We must not pop the item key from the stack
// because otherwise C.lua_next won't work
// properly.
k := l.ToString(-1)
(*vm)[k] = v
}
l.Pop(1)
} else if tk == reflect.Slice && t.Elem().Kind() == reflect.Interface {
if !l.IsTable(-1) {
return fmt.Errorf(
"passed arg #%d must be a table",
len(vars)-i,
)
}
va, _ := v.(*[]any)
// Check if table contains element "n" with
// a count of elements. Useful when an array may
// contain nils.
l.GetTableItem("n")
n := 0
if l.IsNumber(-1) {
n = l.ToInt(-1)
}
l.Pop(1)
scanAndAppend := func () error {
var v any = nil
if l.IsString(-1) {
v = l.ToString(-1)
} else if l.IsNumber(-1) {
v = l.ToInt(-1)
} else if l.IsBoolean(-1) {
v = l.ToBoolean(-1)
} else if l.IsNil(-1) {
v = nil
} else {
return fmt.Errorf("unknown value in array")
}
l.Pop(1)
(*va) = append((*va), v)
return nil
}
if n > 0 {
for i := 0; i < n; i++ {
l.RawGetI(-1, i + 1)
if err := scanAndAppend(); err != nil {
return err
}
}
} else {
l.PushNil()
for l.Next() {
if err := scanAndAppend(); err != nil {
return err
}
}
}
l.Pop(1)
} else {
return fmt.Errorf("unknown var type: %s", t)
}
}
return nil
}
|
