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unmarshal.go
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/
unmarshal.go
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//
// Copyright © 2018 Aljabr, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package json
import (
go_json "encoding/json"
"fmt"
"reflect"
"github.com/kocircuit/kocircuit/lang/circuit/model"
go_eval "github.com/kocircuit/kocircuit/lang/go/eval"
"github.com/kocircuit/kocircuit/lang/go/eval/symbol"
"github.com/kocircuit/kocircuit/lang/go/runtime"
)
func init() {
go_eval.RegisterNamedEvalGate("Unmarshal", new(goUnmarshal))
}
type goUnmarshal struct {
Value string `ko:"name=value,monadic"`
}
func (g *goUnmarshal) Play(ctx *runtime.Context) (symbol.Symbol, error) {
return Unmarshal([]byte(g.Value))
}
func (g *goUnmarshal) Help() string {
return "Unmarshal(value?)"
}
func (g *goUnmarshal) Doc() string {
return "Unmarshal(value?) decodes the given JSON value"
}
// Unmarshal the given encoded JSON to a Go value.
func Unmarshal(encoded []byte) (symbol.Symbol, error) {
var result interface{}
if err := go_json.Unmarshal(encoded, &result); err != nil {
return nil, err
}
return symbol.Deconstruct(model.NewSpan(), mapsToStructs(reflect.ValueOf(result))), nil
}
// mapsToStructs recursively converts map[string]interface{} to structs.
func mapsToStructs(v reflect.Value) reflect.Value {
switch v.Kind() {
case reflect.Map:
if v.Type().Key().Kind() == reflect.String && v.Type().Elem().Kind() == reflect.Interface {
// Conversion needed
keys := v.MapKeys()
// Create struct fields
fields := make([]reflect.StructField, 0, len(keys))
fieldValues := make([]reflect.Value, 0, len(keys))
for i, k := range keys {
fv := v.MapIndex(k)
fv = mapsToStructs(fv)
fields = append(fields, reflect.StructField{
Name: fmt.Sprintf("Field%d", i),
Type: fv.Type(),
Tag: reflect.StructTag(fmt.Sprintf(`ko:"name=%s" json:"%s"`, k.String(), k.String())),
})
fieldValues = append(fieldValues, fv)
}
structType := reflect.StructOf(fields)
vsRef := reflect.New(structType)
vs := vsRef.Elem()
// Fill struct fields
for i := range keys {
vs.Field(i).Set(fieldValues[i])
}
return vsRef
}
// No conversion needed, just recurse into all fields
keys := v.MapKeys()
for _, k := range keys {
fv := v.MapIndex(k)
fv = mapsToStructs(fv)
v.SetMapIndex(k, fv)
}
return v
case reflect.Interface:
if v.IsNil() {
return v
}
return mapsToStructs(v.Elem())
case reflect.Ptr:
if v.IsNil() {
return v
}
return mapsToStructs(v.Elem()).Addr()
case reflect.Slice:
var elemType reflect.Type
allElementsSameType := true
for i := 0; i < v.Len(); i++ {
sv := v.Index(i)
sv = mapsToStructs(sv)
if elemType == nil {
elemType = sv.Type()
} else {
if sv.Type() != elemType {
allElementsSameType = false
}
}
v.Index(i).Set(sv)
}
if elemType != nil && allElementsSameType && v.Type().Elem() != elemType {
// Convert slice type to []elemType
typedV := reflect.MakeSlice(reflect.SliceOf(elemType), 0, v.Cap())
for i := 0; i < v.Len(); i++ {
typedV = reflect.Append(typedV, mapsToStructs(v.Index(i)).Convert(elemType))
}
return typedV
}
return v
case reflect.Struct:
for i := 0; i < v.NumField(); i++ {
fv := v.Field(i)
fv = mapsToStructs(fv)
v.Field(i).Set(fv)
}
return v
default:
return v
}
}