598 lines
14 KiB
Go
598 lines
14 KiB
Go
package reflect
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import (
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"errors"
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"fmt"
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"net/url"
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"reflect"
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"regexp"
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"strconv"
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"strings"
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"unicode"
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)
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var (
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bracketSplitter = regexp.MustCompile(`\[|\]`)
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ErrInvalidStruct = errors.New("invalid struct specified")
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ErrInvalidParam = errors.New("invalid url query param provided")
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)
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func fieldName(name string) string {
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newstr := make([]rune, 0)
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upper := false
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for idx, chr := range name {
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if idx == 0 {
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upper = true
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} else if chr == '_' {
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upper = true
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continue
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}
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if upper {
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newstr = append(newstr, unicode.ToUpper(chr))
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} else {
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newstr = append(newstr, chr)
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}
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upper = false
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}
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return string(newstr)
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}
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func IsEmpty(v reflect.Value) bool {
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switch getKind(v) {
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case reflect.Array, reflect.Map, reflect.Slice, reflect.String:
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return v.Len() == 0
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case reflect.Bool:
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return !v.Bool()
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case reflect.Int:
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return v.Int() == 0
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case reflect.Uint:
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return v.Uint() == 0
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case reflect.Float32:
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return v.Float() == 0
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case reflect.Interface, reflect.Ptr:
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if v.IsNil() {
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return true
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}
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return IsEmpty(v.Elem())
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case reflect.Func:
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return v.IsNil()
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case reflect.Invalid:
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return true
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}
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return false
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}
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func Zero(src interface{}) (interface{}, error) {
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sv := reflect.ValueOf(src)
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if sv.Kind() == reflect.Ptr {
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sv = sv.Elem()
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}
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if sv.Kind() == reflect.Invalid {
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return nil, ErrInvalidStruct
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}
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dst := reflect.New(sv.Type())
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return dst.Interface(), nil
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}
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func StructFields(src interface{}) ([]reflect.StructField, error) {
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var fields []reflect.StructField
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sv := reflect.ValueOf(src)
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if sv.Kind() == reflect.Ptr {
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sv = sv.Elem()
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}
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if sv.Kind() != reflect.Struct {
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return nil, ErrInvalidStruct
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}
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typ := sv.Type()
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for idx := 0; idx < typ.NumField(); idx++ {
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fld := typ.Field(idx)
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val := sv.Field(idx)
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if !val.CanSet() || len(fld.PkgPath) != 0 {
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continue
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}
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if val.Kind() == reflect.Struct {
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infields, err := StructFields(val.Interface())
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if err != nil {
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return nil, err
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}
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fields = append(fields, infields...)
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} else {
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fields = append(fields, fld)
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}
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}
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return fields, nil
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}
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// CopyDefaults for a from b
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// a and b should be pointers to the same kind of struct
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func CopyDefaults(a, b interface{}) {
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pt := reflect.TypeOf(a)
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t := pt.Elem()
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va := reflect.ValueOf(a).Elem()
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vb := reflect.ValueOf(b).Elem()
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for i := 0; i < t.NumField(); i++ {
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aField := va.Field(i)
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if aField.CanSet() {
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bField := vb.Field(i)
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aField.Set(bField)
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}
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}
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}
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// CopyFrom sets the public members of a from b
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// a and b should be pointers to structs
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// a can be a different type from b
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// Only the Fields which have the same name and assignable type on a
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// and b will be set.
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func CopyFrom(a, b interface{}) {
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ta := reflect.TypeOf(a).Elem()
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tb := reflect.TypeOf(b).Elem()
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va := reflect.ValueOf(a).Elem()
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vb := reflect.ValueOf(b).Elem()
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for i := 0; i < tb.NumField(); i++ {
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bField := vb.Field(i)
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tbField := tb.Field(i)
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name := tbField.Name
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aField := va.FieldByName(name)
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taField, found := ta.FieldByName(name)
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if found && aField.IsValid() && bField.IsValid() && aField.CanSet() && tbField.Type.AssignableTo(taField.Type) {
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aField.Set(bField)
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}
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}
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}
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func URLMap(query string) (map[string]interface{}, error) {
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var (
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mp interface{} = make(map[string]interface{})
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)
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params := strings.Split(query, "&")
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for _, part := range params {
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tm, err := queryToMap(part)
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if err != nil {
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return nil, err
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}
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mp = merge(mp, tm)
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}
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return mp.(map[string]interface{}), nil
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}
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func FlattenMap(a map[string]interface{}) map[string]interface{} {
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// preprocess map
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nb := make(map[string]interface{}, len(a))
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for k, v := range a {
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ps := strings.Split(k, ".")
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if len(ps) == 1 {
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nb[k] = v
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continue
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}
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em := make(map[string]interface{})
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em[ps[len(ps)-1]] = v
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for i := len(ps) - 2; i > 0; i-- {
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nm := make(map[string]interface{})
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nm[ps[i]] = em
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em = nm
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}
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if vm, ok := nb[ps[0]]; ok {
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// nested map
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nm := vm.(map[string]interface{})
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for vk, vv := range em {
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nm[vk] = vv
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}
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nb[ps[0]] = nm
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} else {
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nb[ps[0]] = em
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}
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}
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return nb
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}
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func MergeMap(a interface{}, b map[string]interface{}) error {
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var err error
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ta := reflect.TypeOf(a)
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if ta.Kind() == reflect.Ptr {
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ta = ta.Elem()
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}
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va := reflect.ValueOf(a)
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if va.Kind() == reflect.Ptr {
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va = va.Elem()
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}
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for mk, mv := range b {
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vmv := reflect.ValueOf(mv)
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name := fieldName(mk)
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fva := va.FieldByName(name)
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fta, found := ta.FieldByName(name)
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if !found || !fva.IsValid() || !fva.CanSet() || fta.PkgPath != "" {
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continue
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}
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// fast path via direct assign
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if vmv.Type().AssignableTo(fta.Type) && !IsEmpty(vmv) {
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fva.Set(vmv)
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continue
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}
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switch getKind(fva) {
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case reflect.Bool:
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err = mergeBool(fva, vmv)
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case reflect.String:
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err = mergeString(fva, vmv)
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case reflect.Int:
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err = mergeInt(fva, vmv)
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case reflect.Uint:
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err = mergeUint(fva, vmv)
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case reflect.Float32:
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err = mergeFloat(fva, vmv)
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case reflect.Array:
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//fmt.Printf("Array %#+v %#+v\n", fva, vmv)
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case reflect.Slice:
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err = mergeSlice(fva, vmv)
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case reflect.Ptr:
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if fva.IsNil() {
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fva.Set(reflect.New(fva.Type().Elem()))
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if fva.Elem().Type().Kind() == reflect.Struct {
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for i := 0; i < fva.Elem().NumField(); i++ {
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field := fva.Elem().Field(i)
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if field.Type().Kind() == reflect.Ptr && field.IsNil() && fva.Elem().Type().Field(i).Anonymous == true {
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field.Set(reflect.New(field.Type().Elem()))
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}
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}
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}
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}
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if nmp, ok := vmv.Interface().(map[string]interface{}); ok {
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err = MergeMap(fva.Interface(), nmp)
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} else {
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err = fmt.Errorf("cant fill")
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}
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case reflect.Struct:
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if nmp, ok := vmv.Interface().(map[string]interface{}); ok {
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err = MergeMap(fva.Interface(), nmp)
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} else {
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err = fmt.Errorf("cant fill")
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}
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case reflect.Map:
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//fmt.Printf("Map %#+v %#+v\n", fva, vmv)
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}
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if 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 mergeSlice(va, vb reflect.Value) error {
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switch getKind(vb) {
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/*
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case reflect.Int:
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if vb.Int() == 1 {
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va.SetBool(true)
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}
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case reflect.Uint:
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if vb.Uint() == 1 {
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va.SetBool(true)
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}
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case reflect.Float64:
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if vb.Float() == 1 {
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va.SetBool(true)
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}
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*/
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case reflect.String:
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var err error
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fn := func(c rune) bool { return c == ',' || c == ';' || c == ' ' }
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slice := strings.FieldsFunc(vb.String(), fn)
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va.Set(reflect.MakeSlice(va.Type(), len(slice), len(slice)))
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for idx, sl := range slice {
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vl := reflect.ValueOf(sl)
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switch va.Type().Elem().Kind() {
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case reflect.Bool:
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err = mergeBool(va.Index(idx), vl)
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case reflect.String:
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err = mergeString(va.Index(idx), vl)
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case reflect.Ptr:
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if va.Index(idx).IsNil() {
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va.Index(idx).Set(reflect.New(va.Index(idx).Type().Elem()))
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}
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switch va.Type().Elem().String() {
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case "*wrapperspb.BoolValue":
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if eva := reflect.Indirect(va.Index(idx)).FieldByName("Value"); eva.IsValid() {
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err = mergeBool(eva, vl)
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}
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case "*wrapperspb.BytesValue":
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if eva := va.Index(idx).FieldByName("Value"); eva.IsValid() {
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err = mergeUint(eva, vl)
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}
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case "*wrapperspb.DoubleValue", "*wrapperspb.FloatValue":
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if eva := reflect.Indirect(va.Index(idx)).FieldByName("Value"); eva.IsValid() {
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err = mergeFloat(eva, vl)
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}
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case "*wrapperspb.Int32Value", "*wrapperspb.Int64Value":
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if eva := reflect.Indirect(va.Index(idx)).FieldByName("Value"); eva.IsValid() {
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err = mergeInt(eva, vl)
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}
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case "*wrapperspb.StringValue":
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if eva := reflect.Indirect(va.Index(idx)).FieldByName("Value"); eva.IsValid() {
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err = mergeString(eva, vl)
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}
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case "*wrapperspb.UInt32Value", "*wrapperspb.UInt64Value":
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if eva := reflect.Indirect(va.Index(idx)).FieldByName("Value"); eva.IsValid() {
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err = mergeUint(eva, vl)
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}
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}
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}
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if err != nil {
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return err
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}
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}
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default:
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return fmt.Errorf("cant merge %v %s with %v %s", va, va.Kind(), vb, vb.Kind())
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}
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return nil
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}
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func mergeBool(va, vb reflect.Value) error {
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switch getKind(vb) {
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case reflect.Int:
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if vb.Int() == 1 {
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va.SetBool(true)
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}
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case reflect.Uint:
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if vb.Uint() == 1 {
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va.SetBool(true)
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}
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case reflect.Float32:
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if vb.Float() == 1 {
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va.SetBool(true)
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}
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case reflect.String:
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if b, err := strconv.ParseBool(vb.String()); err != nil {
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return err
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} else {
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va.SetBool(b)
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}
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default:
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return fmt.Errorf("cant merge %v %s with %v %s", va, va.Kind(), vb, vb.Kind())
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}
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return nil
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}
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func mergeString(va, vb reflect.Value) error {
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switch getKind(vb) {
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case reflect.Int:
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va.SetString(fmt.Sprintf("%d", vb.Int()))
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case reflect.Uint:
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va.SetString(fmt.Sprintf("%d", vb.Uint()))
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case reflect.Float32:
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va.SetString(fmt.Sprintf("%f", vb.Float()))
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case reflect.String:
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va.Set(vb)
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default:
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return fmt.Errorf("cant merge %v %s with %v %s", va, va.Kind(), vb, vb.Kind())
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}
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return nil
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}
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func mergeInt(va, vb reflect.Value) error {
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switch getKind(vb) {
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case reflect.Int:
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va.Set(vb)
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case reflect.Uint:
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va.SetInt(int64(vb.Uint()))
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case reflect.Float32:
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va.SetInt(int64(vb.Float()))
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case reflect.String:
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if f, err := strconv.ParseInt(vb.String(), 10, va.Type().Bits()); err != nil {
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return err
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} else {
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va.SetInt(f)
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}
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default:
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return fmt.Errorf("cant merge %v %s with %v %s", va, va.Kind(), vb, vb.Kind())
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}
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return nil
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}
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func mergeUint(va, vb reflect.Value) error {
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switch getKind(vb) {
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case reflect.Int:
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va.SetUint(uint64(vb.Int()))
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case reflect.Uint:
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va.Set(vb)
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case reflect.Float32:
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va.SetUint(uint64(vb.Float()))
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case reflect.String:
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if f, err := strconv.ParseUint(vb.String(), 10, va.Type().Bits()); err != nil {
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return err
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} else {
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va.SetUint(f)
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}
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default:
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return fmt.Errorf("cant merge %v %s with %v %s", va, va.Kind(), vb, vb.Kind())
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}
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return nil
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}
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func mergeFloat(va, vb reflect.Value) error {
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switch getKind(vb) {
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case reflect.Int:
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va.SetFloat(float64(vb.Int()))
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case reflect.Uint:
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va.SetFloat(float64(vb.Uint()))
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case reflect.Float32:
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va.Set(vb)
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case reflect.String:
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if f, err := strconv.ParseFloat(vb.String(), va.Type().Bits()); err != nil {
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return err
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} else {
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va.SetFloat(f)
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}
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default:
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return fmt.Errorf("cant merge %v %s with %v %s", va, va.Kind(), vb, vb.Kind())
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}
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return nil
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}
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func getKind(val reflect.Value) reflect.Kind {
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kind := val.Kind()
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switch {
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case kind >= reflect.Int && kind <= reflect.Int64:
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return reflect.Int
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case kind >= reflect.Uint && kind <= reflect.Uint64:
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return reflect.Uint
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case kind >= reflect.Float32 && kind <= reflect.Float64:
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return reflect.Float32
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}
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return kind
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}
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func btSplitter(str string) []string {
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r := bracketSplitter.Split(str, -1)
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for idx, s := range r {
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if len(s) == 0 {
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if len(r) > idx+1 {
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copy(r[idx:], r[idx+1:])
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r = r[:len(r)-1]
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}
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}
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}
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return r
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}
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// queryToMap turns something like a[b][c]=4 into
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// map[string]interface{}{
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// "a": map[string]interface{}{
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// "b": map[string]interface{}{
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// "c": 4,
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// },
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// },
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// }
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func queryToMap(param string) (map[string]interface{}, error) {
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rawKey, rawValue, err := splitKeyAndValue(param)
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if err != nil {
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return nil, err
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}
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rawValue, err = url.QueryUnescape(rawValue)
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if err != nil {
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return nil, err
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}
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rawKey, err = url.QueryUnescape(rawKey)
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if err != nil {
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return nil, err
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}
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pieces := btSplitter(rawKey)
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key := pieces[0]
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// If len==1 then rawKey has no [] chars and we can just
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// decode this as key=value into {key: value}
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if len(pieces) == 1 {
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return map[string]interface{}{
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key: rawValue,
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}, nil
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}
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// If len > 1 then we have something like a[b][c]=2
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// so we need to turn this into {"a": {"b": {"c": 2}}}
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// To do this we break our key into two pieces:
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// a and b[c]
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// and then we set {"a": queryToMap("b[c]", value)}
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ret := make(map[string]interface{})
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ret[key], err = queryToMap(buildNewKey(rawKey) + "=" + rawValue)
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if err != nil {
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return nil, err
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}
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// When URL params have a set of empty brackets (eg a[]=1)
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// it is assumed to be an array. This will get us the
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// correct value for the array item and return it as an
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// []interface{} so that it can be merged properly.
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if pieces[1] == "" {
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temp := ret[key].(map[string]interface{})
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ret[key] = []interface{}{temp[""]}
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}
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return ret, nil
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}
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|
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// buildNewKey will take something like:
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// origKey = "bar[one][two]"
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// pieces = [bar one two ]
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// and return "one[two]"
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func buildNewKey(origKey string) string {
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pieces := btSplitter(origKey)
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ret := origKey[len(pieces[0])+1:]
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ret = ret[:len(pieces[1])] + ret[len(pieces[1])+1:]
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return ret
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}
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|
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// splitKeyAndValue splits a URL param at the last equal
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// sign and returns the two strings. If no equal sign is
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// found, the ErrInvalidParam error is returned.
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func splitKeyAndValue(param string) (string, string, error) {
|
|
li := strings.LastIndex(param, "=")
|
|
if li == -1 {
|
|
return "", "", ErrInvalidParam
|
|
}
|
|
return param[:li], param[li+1:], nil
|
|
}
|
|
|
|
// merge merges a with b if they are either both slices
|
|
// or map[string]interface{} types. Otherwise it returns b.
|
|
func merge(a interface{}, b interface{}) interface{} {
|
|
if av, aok := a.(map[string]interface{}); aok {
|
|
if bv, bok := b.(map[string]interface{}); bok {
|
|
return mergeMapIface(av, bv)
|
|
}
|
|
}
|
|
if av, aok := a.([]interface{}); aok {
|
|
if bv, bok := b.([]interface{}); bok {
|
|
return mergeSliceIface(av, bv)
|
|
}
|
|
}
|
|
|
|
va := reflect.ValueOf(a)
|
|
vb := reflect.ValueOf(b)
|
|
if (va.Type().Kind() == reflect.Slice) && (va.Type().Elem().Kind() == vb.Type().Kind() || vb.Type().ConvertibleTo(va.Type().Elem())) {
|
|
va = reflect.Append(va, vb.Convert(va.Type().Elem()))
|
|
return va.Interface()
|
|
}
|
|
|
|
return b
|
|
}
|
|
|
|
// mergeMap merges a with b, attempting to merge any nested
|
|
// values in nested maps but eventually overwriting anything
|
|
// in a that can't be merged with whatever is in b.
|
|
func mergeMapIface(a map[string]interface{}, b map[string]interface{}) map[string]interface{} {
|
|
for bK, bV := range b {
|
|
if aV, ok := a[bK]; ok {
|
|
if (reflect.ValueOf(aV).Type().Kind() == reflect.ValueOf(bV).Type().Kind()) ||
|
|
((reflect.ValueOf(aV).Type().Kind() == reflect.Slice) && reflect.ValueOf(aV).Type().Elem().Kind() == reflect.ValueOf(bV).Type().Kind()) {
|
|
nV := []interface{}{aV, bV}
|
|
a[bK] = nV
|
|
} else {
|
|
a[bK] = merge(a[bK], bV)
|
|
}
|
|
} else {
|
|
a[bK] = bV
|
|
}
|
|
}
|
|
return a
|
|
}
|
|
|
|
// mergeSlice merges a with b and returns the result.
|
|
func mergeSliceIface(a []interface{}, b []interface{}) []interface{} {
|
|
a = append(a, b...)
|
|
return a
|
|
}
|