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util.go
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util.go
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package gluasql_util
import (
"fmt"
"reflect"
"strconv"
"strings"
"github.com/yuin/gopher-lua"
)
func GetValue(l *lua.LState, n int) interface{} {
return GetArbitraryValue(l, l.Get(n))
}
func GetArbitraryValue(l *lua.LState, v lua.LValue) interface{} {
switch t := v.Type(); t {
case lua.LTNil:
return nil
case lua.LTBool:
return lua.LVAsBool(v)
case lua.LTNumber:
f := lua.LVAsNumber(v)
if float64(f) == float64(int(f)) {
return int(f)
}
return float64(f)
case lua.LTString:
return lua.LVAsString(v)
case lua.LTTable:
m := map[string]interface{}{}
tb := v.(*lua.LTable)
arrSize := 0
tb.ForEach(func(k, val lua.LValue) {
key := GetArbitraryValue(l, k)
if keyi, ok := key.(int); ok {
if arrSize >= 0 && arrSize < keyi {
arrSize = keyi
}
key = strconv.Itoa(keyi)
} else {
arrSize = -1
}
m[key.(string)] = GetArbitraryValue(l, val)
})
if arrSize >= 0 {
ms := make([]interface{}, arrSize)
for i := 0; i < arrSize; i++ {
ms[i] = m[strconv.Itoa(i+1)]
}
return ms
}
return m
default:
panic(fmt.Sprintf("unknown lua type: %s", t))
}
}
func ToArbitraryValue(l *lua.LState, i interface{}) lua.LValue {
if i == nil {
return lua.LNil
}
switch ii := i.(type) {
case bool:
return lua.LBool(ii)
case int:
return lua.LNumber(ii)
case int8:
return lua.LNumber(ii)
case int16:
return lua.LNumber(ii)
case int32:
return lua.LNumber(ii)
case int64:
return lua.LNumber(ii)
case uint:
return lua.LNumber(ii)
case uint8:
return lua.LNumber(ii)
case uint16:
return lua.LNumber(ii)
case uint32:
return lua.LNumber(ii)
case uint64:
return lua.LNumber(ii)
case float64:
return lua.LNumber(ii)
case float32:
return lua.LNumber(ii)
case string:
return lua.LString(ii)
case []byte:
return lua.LString(ii)
default:
v := reflect.ValueOf(i)
switch v.Kind() {
case reflect.Ptr:
return ToArbitraryValue(l, v.Elem().Interface())
case reflect.Struct:
return ToTableFromStruct(l, v)
case reflect.Map:
return ToTableFromMap(l, v)
case reflect.Slice:
return ToTableFromSlice(l, v)
default:
panic(fmt.Sprintf("unknown type being pushed onto lua stack: %T %+v", i, i))
}
}
}
func ToTableFromStruct(l *lua.LState, v reflect.Value) lua.LValue {
tb := l.NewTable()
return toTableFromStructInner(l, tb, v)
}
func toTableFromStructInner(l *lua.LState, tb *lua.LTable, v reflect.Value) lua.LValue {
t := v.Type()
for j := 0; j < v.NumField(); j++ {
var inline bool
name := t.Field(j).Name
if tag := t.Field(j).Tag.Get("luautil"); tag != "" {
tagParts := strings.Split(tag, ",")
if tagParts[0] == "-" {
continue
} else if tagParts[0] != "" {
name = tagParts[0]
}
if len(tagParts) > 1 && tagParts[1] == "inline" {
inline = true
}
}
if inline {
toTableFromStructInner(l, tb, v.Field(j))
} else {
tb.RawSetString(name, ToArbitraryValue(l, v.Field(j).Interface()))
}
}
return tb
}
func ToTableFromMap(l *lua.LState, v reflect.Value) lua.LValue {
tb := &lua.LTable{}
for _, k := range v.MapKeys() {
tb.RawSet(ToArbitraryValue(l, k.Interface()),
ToArbitraryValue(l, v.MapIndex(k).Interface()))
}
return tb
}
func ToTableFromSlice(l *lua.LState, v reflect.Value) lua.LValue {
tb := &lua.LTable{}
for j := 0; j < v.Len(); j++ {
tb.RawSet(ToArbitraryValue(l, j+1), // because lua is 1-indexed
ToArbitraryValue(l, v.Index(j).Interface()))
}
return tb
}