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node.go
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node.go
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package node // import "kego.io/system/node"
// ke: {"package": {"complete": true}}
import (
"fmt"
"reflect"
"github.com/davelondon/kerr"
"golang.org/x/net/context"
"kego.io/json"
"kego.io/ke"
"kego.io/system"
)
type Node struct {
Parent *Node
Array []*Node
Map map[string]*Node
Key string // in an object or a map, this is the key
Index int // in an array, this is the index
Origin *system.Reference // in an object, this is the type that the field originated from - e.g. perhaps an embedded type
ValueString string
ValueNumber float64
ValueBool bool
Value interface{} // unmarshalled value
Val reflect.Value
Null bool // null is true if the json is null or the field is missing
Missing bool // missing is only true if the field is missing
Rule *system.RuleWrapper
Type *system.Type
JsonType json.Type
}
func Unmarshal(ctx context.Context, data []byte) (*Node, error) {
n := NewNode()
if err := ke.UnmarshalUntyped(ctx, data, n); err != nil {
return nil, kerr.Wrap("QDWFKJOJPQ", err)
}
return n, nil
}
func NewNode() *Node {
n := &Node{Index: -1}
return n
}
// Unpack unpacks a node from an unpackable
func (n *Node) Unpack(ctx context.Context, in json.Packed) error {
n.InitialiseRoot()
if err := n.SetValueUnpack(ctx, in); err != nil {
return kerr.Wrap("WVFVMGWPQJ", err)
}
return nil
}
var _ json.Unpacker = (*Node)(nil)
func (n *Node) SetValueString(ctx context.Context, value string) error {
if err := n.SetValueUnpack(ctx, json.Pack(value)); err != nil {
return kerr.Wrap("GAMJNECRUW", err)
}
return nil
}
func (n *Node) SetValueNumber(ctx context.Context, value float64) error {
if err := n.SetValueUnpack(ctx, json.Pack(value)); err != nil {
return kerr.Wrap("SOJGUGHXSX", err)
}
return nil
}
func (n *Node) SetValueBool(ctx context.Context, value bool) error {
if err := n.SetValueUnpack(ctx, json.Pack(value)); err != nil {
return kerr.Wrap("AWRMEACQWR", err)
}
return nil
}
func (n *Node) DeleteObjectChild(ctx context.Context, field string) error {
if n.JsonType != json.J_OBJECT {
return kerr.New("BMUSITINTC", "Must be J_OBJECT")
}
child := n.Map[field]
if err := child.setZero(ctx, true, true); err != nil {
return kerr.Wrap("HPXJKGQYLL", err)
}
return nil
}
func (n *Node) DeleteMapChild(key string) error {
if n.JsonType != json.J_MAP {
return kerr.New("ACRGPCPPFK", "Must be J_MAP")
}
delete(n.Map, key)
deleteFromMap(n.Val, key)
return nil
}
func (n *Node) DeleteArrayChild(index int) error {
if n.JsonType != json.J_ARRAY {
return kerr.New("NFVEWWCSMV", "Must be J_ARRAY")
}
n.Array = append(n.Array[:index], n.Array[index+1:]...)
for i, n := range n.Array {
n.Index = i
}
deleteFromSlice(n.Val, index)
return nil
}
func (n *Node) ReorderArrayChild(from, to int) error {
if n.JsonType != json.J_ARRAY {
return kerr.New("MHEXGBUQOL", "Must be J_ARRAY")
}
a := n.Array
// remove the item we're moving
item := a[from]
a = append(
a[:from],
a[from+1:]...)
// insert it back in the correct place
n.Array = append(
a[:to],
append([]*Node{item}, a[to:]...)...)
// correct the indexes
for i, c := range n.Array {
c.Index = i
}
val := n.Val.Index(from).Interface()
deleteFromSlice(n.Val, from)
insertIntoSlice(n.Val, to, reflect.ValueOf(val))
return nil
}
func deleteFromMap(v reflect.Value, key string) {
v.SetMapIndex(reflect.ValueOf(key), reflect.Value{})
}
func deleteFromSlice(v reflect.Value, i int) {
v.Set(reflect.AppendSlice(v.Slice(0, i), v.Slice(i+1, v.Len())))
}
func appendToSlice(v reflect.Value, val reflect.Value) {
v.Set(reflect.Append(v, val))
}
func insertIntoSlice(v reflect.Value, i int, val reflect.Value) {
v.Set(reflect.AppendSlice(v.Slice(0, i+1), v.Slice(i, v.Len())))
v.Index(i).Set(val)
}
func (n *Node) InitialiseRoot() {
n.resetAllValues()
}
func (n *Node) AddToArray(ctx context.Context, parent *Node, index int, useParentVal bool) error {
n.resetAllValues()
n.Parent = parent
n.Index = index
n.Missing = false
rule, err := parent.Rule.ItemsRule()
if err != nil {
return kerr.Wrap("SBJVMGUOOA", err)
}
n.Rule = rule
t, err := extractType(ctx, json.Pack(nil), rule)
if err != nil {
return kerr.Wrap("EQNRHQWXFJ", err)
}
n.Type = t
if index > len(parent.Array) {
return kerr.New("GHJIDXABLL", "Index out of bounds")
} else if index == len(parent.Array) {
parent.Array = append(parent.Array, n)
} else {
parent.Array[index] = n
}
if !useParentVal {
if index > parent.Val.Len() {
return kerr.New("YFKMXFUPHY", "Index out of bounds")
} else if index == parent.Val.Len() {
appendToSlice(parent.Val, reflect.Zero(parent.Val.Type().Elem()))
} else {
parent.Val.Index(index).Set(reflect.Zero(parent.Val.Type().Elem()))
}
}
n.initialiseValFromParent()
return nil
}
func (n *Node) AddToMap(ctx context.Context, parent *Node, key string, useParentVal bool) error {
n.resetAllValues()
n.Parent = parent
n.Key = key
n.Missing = false
rule, err := parent.Rule.ItemsRule()
if err != nil {
return kerr.Wrap("MMUUKGFEAA", err)
}
n.Rule = rule
t, err := extractType(ctx, json.Pack(nil), rule)
if err != nil {
return kerr.Wrap("YYHFMEVMRO", err)
}
n.Type = t
parent.Map[key] = n
if !useParentVal {
parent.Val.SetMapIndex(reflect.ValueOf(key), reflect.Zero(parent.Val.Type().Elem()))
}
n.initialiseValFromParent()
return nil
}
func (n *Node) addToObject(ctx context.Context, parent *Node, rule *system.RuleWrapper, key string, origin *system.Reference, useParentVal bool) error {
n.resetAllValues()
n.Parent = parent
n.Rule = rule
n.Key = key
n.Origin = origin
t, err := extractType(ctx, json.Pack(nil), rule)
if err != nil {
return kerr.Wrap("RBDBRRUVMM", err)
}
n.Type = t
parent.Map[key] = n
rt, err := rule.GetReflectType()
if err != nil {
return kerr.Wrap("QMGGBWEMPT", err)
}
p := parent.Val
for p.Kind() == reflect.Interface || p.Kind() == reflect.Ptr {
p = p.Elem()
}
f := p.FieldByName(system.GoName(key))
if !useParentVal {
f.Set(reflect.Zero(rt))
}
n.initialiseValFromParent()
return nil
}
func (n *Node) resetAllValues() {
n.Parent = nil
n.Array = []*Node{}
n.Map = map[string]*Node{}
n.Key = ""
n.Index = -1
n.Origin = nil
n.ValueString = ""
n.ValueNumber = 0.0
n.ValueBool = false
n.Value = nil
n.Val = reflect.Value{}
n.Null = true
n.Missing = true
n.Rule = nil
n.Type = nil
n.JsonType = json.J_NULL
}
func (n *Node) initialiseValFromParent() {
switch n.Parent.JsonType {
case json.J_OBJECT:
v := n.Parent.Val
for v.Kind() == reflect.Ptr || v.Kind() == reflect.Interface {
v = v.Elem()
}
n.Val = v.FieldByName(system.GoName(n.Key))
case json.J_MAP:
n.Val = n.Parent.Val.MapIndex(reflect.ValueOf(n.Key))
case json.J_ARRAY:
n.Val = n.Parent.Val.Index(n.Index)
}
n.Value = n.Val.Interface()
}
func (n *Node) SetValueUnpack(ctx context.Context, in json.Packed) error {
if err := n.setValue(ctx, in, false); err != nil {
return kerr.Wrap("FAVEHOUYHB", err)
}
return nil
}
func (n *Node) setValue(ctx context.Context, in json.Packed, useParentVal bool) error {
n.Missing = false
objectType, err := extractType(ctx, in, n.Rule)
if err != nil {
return kerr.Wrap("MKMNOOYQJY", err)
}
n.Type = objectType
if n.Rule == nil && objectType != nil {
n.Rule = system.WrapEmptyRule(ctx, objectType)
}
if in.Type() == json.J_MAP && n.Type.IsNativeObject() {
// for objects and maps, Type() from the json.Packed is always J_MAP, so we correct it
// for object types here.
n.JsonType = json.J_OBJECT
} else {
n.JsonType = in.Type()
}
n.Null = in.Type() == json.J_NULL
// validate json type
if !n.Null && n.Type.NativeJsonType() != n.JsonType {
return kerr.New("VEPLUIJXSN", "json type is %s but object type is %s", n.JsonType, n.Type.NativeJsonType())
}
if !useParentVal {
var rv reflect.Value
if n.Rule.Struct == nil {
if err := json.Unpack(ctx, in, &n.Value); err != nil {
return kerr.Wrap("CQMWGPLYIJ", err)
}
} else {
t, err := n.Rule.GetReflectType()
if err != nil {
return kerr.Wrap("DQJDYPIANO", err)
}
if err := json.UnpackFragment(ctx, in, &n.Value, t); err != nil {
return kerr.Wrap("PEVKGFFHLL", err)
}
}
rv = reflect.ValueOf(n.Value)
n.setVal(rv)
}
switch n.Type.NativeJsonType() {
case json.J_STRING:
n.ValueString = in.String()
case json.J_NUMBER:
n.ValueNumber = in.Number()
case json.J_BOOL:
n.ValueBool = in.Bool()
case json.J_ARRAY:
children := in.Array()
for i, child := range children {
childNode := NewNode()
if err := childNode.AddToArray(ctx, n, i, useParentVal); err != nil {
return kerr.Wrap("VWWYPDIJKP", err)
}
if err := childNode.setValue(ctx, child, true); err != nil {
return kerr.Wrap("KUCBPFFJNT", err)
}
}
case json.J_MAP:
n.Map = map[string]*Node{}
children := in.Map()
for name, child := range children {
childNode := NewNode()
if err := childNode.AddToMap(ctx, n, name, useParentVal); err != nil {
return kerr.Wrap("HTOPDOKPRE", err)
}
if err := childNode.setValue(ctx, child, true); err != nil {
return kerr.Wrap("LWCSAHSBDF", err)
}
}
case json.J_OBJECT:
if err := n.initialiseFields(ctx, in, true); err != nil {
return kerr.Wrap("XCRYJWKPKP", err)
}
}
return nil
}
func (n *Node) SetValueZero(ctx context.Context, null bool, t *system.Type) error {
if t != nil {
if err := n.setType(t); err != nil {
return kerr.Wrap("TGPRRSUSMQ", err)
}
}
if err := n.setZero(ctx, null, false); err != nil {
return kerr.Wrap("JWCKCAJXUB", err)
}
return nil
}
func (n *Node) setType(t *system.Type) error {
if t.Interface {
return kerr.New("VHOSYBMDQL", "Can't set type to an interface - must be concrete type.")
}
n.Type = t
n.JsonType = t.NativeJsonType()
return nil
}
func (n *Node) setZero(ctx context.Context, null bool, missing bool) error {
if missing && !null {
return kerr.New("NYQULBBBHO", "If missing, must also be null")
}
if missing && (n.Parent == nil || n.Parent.JsonType != json.J_OBJECT) {
return kerr.New("XRYLQWRNPH", "Parent must be J_OBJECT")
}
if n.Type == nil {
return kerr.New("ABXFQOYCBA", "Can't set value without a type")
}
if n.Type.IsNativeCollection() && n.Rule == nil {
return kerr.New("VGKTIRMDTJ", "Can't create collection zero value without a rule")
}
n.Missing = missing
n.Null = null
n.ValueString = ""
n.ValueNumber = 0.0
n.ValueBool = false
n.Array = []*Node{}
n.Map = map[string]*Node{}
if null {
n.JsonType = json.J_NULL
} else {
// if this node was previously null, we must reset the json type
n.JsonType = n.Type.NativeJsonType()
}
var rv reflect.Value
if n.Type.IsNativeCollection() {
var err error
if rv, err = n.Rule.ZeroValue(null); err != nil {
return kerr.Wrap("WNQLTRJRBD", err)
}
} else {
// this is for both objects and native values
var err error
if rv, err = n.Type.ZeroValue(ctx, null); err != nil {
return kerr.Wrap("UDBVTIDRIK", err)
}
}
n.Value = rv.Interface()
n.setVal(rv)
if !null && n.Type.IsNativeObject() {
if err := n.initialiseFields(ctx, nil, false); err != nil {
return kerr.Wrap("VSAXCHGCOG", err)
}
if err := n.setCorrectTypeField(ctx); err != nil {
return kerr.Wrap("CUCJDNBBSU", err)
}
}
return nil
}
func (n *Node) setCorrectTypeField(ctx context.Context) error {
typeField, ok := n.Map["type"]
if !ok {
return kerr.New("DQKGYKFQKJ", "type field not found")
}
typeString, err := n.Type.Id.ValueContext(ctx)
if err != nil {
return kerr.Wrap("MRHEBUUXBB", err)
}
if err := typeField.SetValueString(ctx, typeString); err != nil {
return kerr.Wrap("CURDKCQLGS", err)
}
return nil
}
func (n *Node) setVal(rv reflect.Value) {
if n.Parent == nil {
n.Val = rv
} else if n.Parent.Type.IsNativeMap() {
n.Parent.Val.SetMapIndex(reflect.ValueOf(n.Key), rv)
n.Val = n.Parent.Val.MapIndex(reflect.ValueOf(n.Key))
for n.Val.Kind() == reflect.Interface {
n.Val = n.Val.Elem()
}
} else if n.Parent.Type.IsNativeArray() {
n.Val = n.Parent.Val.Index(n.Index)
n.Val.Set(rv)
for n.Val.Kind() == reflect.Interface {
n.Val = n.Val.Elem()
}
} else {
n.Val.Set(rv)
}
}
func (n *Node) initialiseFields(ctx context.Context, in json.Packed, useParentVal bool) error {
valueFields := map[string]json.Packed{}
if in != nil && in.Type() != json.J_NULL {
valueFields = in.Map()
}
typeFields := map[string]*system.Field{}
if err := extractFields(ctx, typeFields, n.Type); err != nil {
return kerr.Wrap("LPWTOSATQE", err)
}
for name, typeField := range typeFields {
rule, err := system.WrapRule(ctx, typeField.Rule)
if err != nil {
return kerr.Wrap("YWFSOLOBXH", err)
}
valueField, valueExists := valueFields[name]
childNode := NewNode()
if err := childNode.addToObject(ctx, n, rule, name, typeField.Origin, useParentVal); err != nil {
return kerr.Wrap("LJUGPMWNPD", err)
}
if valueExists {
if err := childNode.setValue(ctx, valueField, true); err != nil {
return kerr.Wrap("UWOTRJJVNK", err)
}
}
}
for name, _ := range valueFields {
_, ok := typeFields[name]
if !ok {
return kerr.New("SRANLETJRS", "Extra field %s", name)
}
}
return nil
}
func extractType(ctx context.Context, in json.Packed, rule *system.RuleWrapper) (*system.Type, error) {
parentInterface := rule != nil && rule.Parent != nil && rule.Parent.Interface
ruleInterface := rule != nil && rule.Struct != nil && rule.Struct.Interface
if parentInterface && ruleInterface {
return nil, kerr.New("TDXTPGVFAK", "Can't have interface type and interface rule at the same time")
}
if rule != nil && rule.Parent != nil && !parentInterface && !ruleInterface {
// If we have a rule with the parent, and it's not an interface, then we just return the
// parent type of the rule.
return rule.Parent, nil
}
// if the rule is nil (e.g. unpacking into an unknown type) or the type is an interface, we
// ensure the input is a map
if rule == nil || parentInterface {
if in == nil {
return nil, nil
}
switch in.Type() {
case json.J_NULL:
// item is nil, so we don't know the concrete type yet.
return nil, nil
case json.J_MAP:
break
default:
return nil, kerr.New("DLSQRFLINL", "Input %s should be J_MAP if rule is nil or an interface type", in.Type())
}
}
// if the rule is an interface rule, we ensure the input is a map or a native value
if ruleInterface {
if in == nil {
return nil, nil
}
switch in.Type() {
case json.J_NULL:
// item is nil, so we don't know the concrete type yet.
return nil, nil
case json.J_MAP:
break
case json.J_STRING, json.J_NUMBER, json.J_BOOL:
// if the input value is a native value, we will be unpacking into the parent
// type of the rule
return rule.Parent, nil
default:
return nil, kerr.New("SNYLGBJYTM", "Input %s should be J_MAP, J_STRING, J_NUMBER or J_BOOL if rule is interface rule", in.Type())
}
}
ob := in.Map()
typeField, ok := ob["type"]
if !ok {
return nil, kerr.New("HBJVDKAKBJ", "Input must have type field if rule is nil or an interface type")
}
var r system.Reference
if err := r.Unpack(ctx, typeField); err != nil {
return nil, kerr.Wrap("YXHGIBXCOC", err)
}
t, ok := r.GetType(ctx)
if !ok {
return nil, kerr.New("IJFMJJWVCA", "Could not find type %s", r.Value())
}
return t, nil
}
func extractFields(ctx context.Context, fields map[string]*system.Field, t *system.Type) error {
if !t.Basic && !t.Interface {
// All types apart from Basic types embed system:object
ob, ok := system.GetTypeFromCache(ctx, "kego.io/system", "object")
if !ok {
return kerr.New("YRFWOTIGFT", "Type system:object not found in sys ctx")
}
if err := extractFields(ctx, fields, ob); err != nil {
return kerr.Wrap("DTQEFALIMM", err)
}
}
for _, embedRef := range t.Embed {
embed, ok := system.GetTypeFromCache(ctx, embedRef.Package, embedRef.Name)
if !ok {
return kerr.New("SLIRILCARQ", "Type %s not found in sys ctx", embedRef)
}
if err := extractFields(ctx, fields, embed); err != nil {
return kerr.Wrap("JWAPCVIYBJ", err)
}
}
for name, rule := range t.Fields {
if _, ok := fields[name]; ok {
return kerr.New("BARXPFXQNB", "Duplicate field %s", name)
}
fields[name] = &system.Field{Name: name, Rule: rule, Origin: t.Id}
}
return nil
}
func (n *Node) Label(ctx context.Context) string {
if n == nil {
return "(nil)"
}
if n.Parent == nil {
if o, ok := n.Value.(system.ObjectInterface); ok {
ob := o.GetObject(ctx)
if ob != nil && ob.Id != nil {
return ob.Id.Name
}
}
return "root"
}
if n.Key != "" {
return n.Key
}
if l, ok := n.Value.(system.Labelled); ok && ctx != nil {
if s := l.Label(ctx); s != "" {
return s
}
}
if n.Index > -1 {
return fmt.Sprintf("%d", n.Index)
}
return "(?)"
}
func (n *Node) Path() (path string) {
for n != nil {
if path != "" {
path = n.Label(nil) + "/" + path
} else {
path = n.Label(nil)
}
n = n.Parent
}
return path
}
func (n *Node) Root() *Node {
for n != nil {
if n.Parent == nil {
return n
}
n = n.Parent
}
return nil
}
func (n *Node) DisplayType(ctx context.Context) (string, error) {
if n.Missing || n.Null {
return "null", nil
}
if n.Type.IsNativeCollection() {
str, err := n.Rule.DisplayType()
if err != nil {
return "", kerr.Wrap("AKTVTUJXWS", err)
}
return str, nil
}
str, err := n.Type.Id.ValueContext(ctx)
if err != nil {
return "", kerr.Wrap("BGWYLIFSNN", err)
}
return str, nil
}