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mox!
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80
vendor/github.com/mjl-/bstore/default.go
generated
vendored
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80
vendor/github.com/mjl-/bstore/default.go
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@ -0,0 +1,80 @@
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package bstore
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import (
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"fmt"
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"reflect"
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"time"
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)
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var zerotime = time.Time{}
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// applyDefault replaces zero values for fields that have a Default value configured.
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func (tv *typeVersion) applyDefault(rv reflect.Value) error {
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for _, f := range tv.Fields[1:] {
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fv := rv.FieldByIndex(f.structField.Index)
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if err := f.applyDefault(fv); err != nil {
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return err
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}
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}
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return nil
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}
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func (f field) applyDefault(rv reflect.Value) error {
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switch f.Type.Kind {
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case kindBytes, kindBinaryMarshal, kindMap:
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return nil
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case kindSlice, kindStruct:
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return f.Type.applyDefault(rv)
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case kindBool, kindInt, kindInt8, kindInt16, kindInt32, kindInt64, kindUint, kindUint8, kindUint16, kindUint32, kindUint64, kindFloat32, kindFloat64, kindString, kindTime:
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if !f.defaultValue.IsValid() || !rv.IsZero() {
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return nil
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}
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fv := f.defaultValue
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// Time is special. "now" is encoded as the zero value of time.Time.
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if f.Type.Kind == kindTime && fv.Interface() == zerotime {
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now := time.Now().Round(0)
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if f.Type.Ptr {
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fv = reflect.ValueOf(&now)
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} else {
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fv = reflect.ValueOf(now)
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}
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} else if f.Type.Ptr {
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fv = reflect.New(f.structField.Type.Elem())
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fv.Elem().Set(f.defaultValue)
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}
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rv.Set(fv)
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return nil
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default:
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return fmt.Errorf("internal error: missing case for %v", f.Type.Kind)
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}
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}
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// only for recursing. we do not support recursing into maps because it would
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// involve more work making values settable. and how sensible it it anyway?
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func (ft fieldType) applyDefault(rv reflect.Value) error {
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if ft.Ptr && (rv.IsZero() || rv.IsNil()) {
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return nil
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} else if ft.Ptr {
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rv = rv.Elem()
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}
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switch ft.Kind {
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case kindSlice:
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n := rv.Len()
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for i := 0; i < n; i++ {
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if err := ft.List.applyDefault(rv.Index(i)); err != nil {
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return err
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}
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}
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case kindStruct:
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for _, nf := range ft.Fields {
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nfv := rv.FieldByIndex(nf.structField.Index)
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if err := nf.applyDefault(nfv); err != nil {
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return err
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}
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}
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}
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return nil
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}
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