115 lines
2.1 KiB
Go
115 lines
2.1 KiB
Go
package bun
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import "reflect"
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func indirect(v reflect.Value) reflect.Value {
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switch v.Kind() {
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case reflect.Interface:
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return indirect(v.Elem())
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case reflect.Ptr:
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return v.Elem()
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default:
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return v
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}
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}
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func walk(v reflect.Value, index []int, fn func(reflect.Value)) {
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v = reflect.Indirect(v)
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switch v.Kind() {
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case reflect.Slice:
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sliceLen := v.Len()
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for i := 0; i < sliceLen; i++ {
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visitField(v.Index(i), index, fn)
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}
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default:
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visitField(v, index, fn)
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}
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}
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func visitField(v reflect.Value, index []int, fn func(reflect.Value)) {
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v = reflect.Indirect(v)
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if len(index) > 0 {
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v = v.Field(index[0])
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if v.Kind() == reflect.Ptr && v.IsNil() {
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return
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}
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walk(v, index[1:], fn)
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} else {
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fn(v)
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}
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}
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func typeByIndex(t reflect.Type, index []int) reflect.Type {
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for _, x := range index {
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switch t.Kind() {
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case reflect.Ptr:
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t = t.Elem()
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case reflect.Slice:
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t = indirectType(t.Elem())
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}
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t = t.Field(x).Type
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}
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return indirectType(t)
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}
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func indirectType(t reflect.Type) reflect.Type {
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if t.Kind() == reflect.Ptr {
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t = t.Elem()
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}
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return t
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}
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func sliceElemType(v reflect.Value) reflect.Type {
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elemType := v.Type().Elem()
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if elemType.Kind() == reflect.Interface && v.Len() > 0 {
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return indirect(v.Index(0).Elem()).Type()
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}
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return indirectType(elemType)
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}
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func makeSliceNextElemFunc(v reflect.Value) func() reflect.Value {
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if v.Kind() == reflect.Array {
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var pos int
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return func() reflect.Value {
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v := v.Index(pos)
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pos++
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return v
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}
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}
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sliceType := v.Type()
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elemType := sliceType.Elem()
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if elemType.Kind() == reflect.Ptr {
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elemType = elemType.Elem()
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return func() reflect.Value {
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if v.Len() < v.Cap() {
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v.Set(v.Slice(0, v.Len()+1))
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elem := v.Index(v.Len() - 1)
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if elem.IsNil() {
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elem.Set(reflect.New(elemType))
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}
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return elem.Elem()
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}
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elem := reflect.New(elemType)
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v.Set(reflect.Append(v, elem))
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return elem.Elem()
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}
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}
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zero := reflect.Zero(elemType)
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return func() reflect.Value {
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l := v.Len()
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c := v.Cap()
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if l < c {
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v.Set(v.Slice(0, l+1))
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return v.Index(l)
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}
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v.Set(reflect.Append(v, zero))
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return v.Index(l)
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}
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}
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