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context.go
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context.go
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// Copyright 2018-2019 Liu Dong <ddliuhb@gmail.com>.
// Licensed under the MIT license.
package fractal
import (
"encoding/json"
"errors"
"reflect"
"strings"
"github.com/spf13/cast"
)
func New(data interface{}) *Context {
return &Context{
data: data,
}
}
func FromJson(jsonData []byte) *Context {
var data interface{}
json.Unmarshal(jsonData, &data)
return New(data)
}
// Context container
type Context struct {
data interface{}
}
func valueOfContext(v interface{}) (interface{}, error) {
if v == nil {
return nil, nil
}
if vv, ok := v.(Context); ok {
return vv.GetValueE()
}
if vv, ok := v.(*Context); ok {
return vv.GetValueE()
}
return v, nil
}
func (c *Context) GetValueE(paths ...string) (interface{}, error) {
var path string
if len(paths) == 0 {
path = ""
} else {
path = strings.Join(paths, ".")
}
if path == "" || path == "." {
return valueOfContext(c.data)
}
parts := strings.Split(path, ".")
v := c.data
for _, part := range parts {
if part == "" {
continue
}
t, m, l, _, err := parseValue(v)
if err != nil {
return nil, err
}
if t == TYPE_MAP {
if part == "length()" {
v = len(m)
} else {
vv, ok := m[part]
if !ok {
return nil, errors.New("Path does not exist")
}
v = vv
}
} else if t == TYPE_LIST {
if part == "length()" {
v = len(l)
} else {
idx, err := cast.ToIntE(part)
if err != nil {
return nil, err
}
if idx < 0 || idx >= len(l) {
return nil, errors.New("Index out of range")
}
v = l[idx]
}
} else {
return nil, errors.New("Path does not exist")
}
}
return valueOfContext(v)
}
func (c *Context) GetValue(paths ...string) interface{} {
v, err := c.GetValueE(paths...)
if err != nil {
return nil
}
return v
}
func (c *Context) GetMapContextE(paths ...string) (map[string]*Context, error) {
value, err := c.GetValueE(paths...)
if err != nil {
return nil, err
}
t, m, _, _, err := parseValue(value)
if err != nil {
return nil, err
}
if t != TYPE_MAP {
return nil, errors.New("Not a map")
}
result := make(map[string]*Context)
for k, v := range m {
result[k] = New(v)
}
return result, nil
}
func (c *Context) GetMapContext(paths ...string) map[string]*Context {
v, err := c.GetMapContextE(paths...)
if err != nil {
return make(map[string]*Context)
}
return v
}
func (c *Context) GetListContextE(paths ...string) ([]*Context, error) {
value, err := c.GetValueE(paths...)
if err != nil {
return nil, err
}
t, _, l, _, err := parseValue(value)
if err != nil {
return nil, err
}
if t != TYPE_LIST {
return nil, errors.New("Not a list")
}
var result []*Context
for _, v := range l {
result = append(result, New(v))
}
return result, nil
}
func (c *Context) GetListContext(paths ...string) []*Context {
v, _ := c.GetListContextE(paths...)
return v
}
func (c *Context) Keys() []string {
_, m, _, _, _ := parseValue(c.data)
if m == nil {
return nil
}
var result []string
for k, _ := range m {
result = append(result, k)
}
return result
}
func (c *Context) Length() int {
t, m, l, _, _ := parseValue(c.data)
if t == TYPE_MAP {
return len(m)
} else if t == TYPE_LIST {
return len(l)
} else {
return 0
}
}
func (c *Context) GetContextWithTypeE(paths ...string) (SimpleType, *Context, error) {
value, err := c.GetValueE(paths...)
if err != nil {
return TYPE_UNKNOWN, nil, err
}
t, _, _, _, err := parseValue(value)
if err != nil {
return TYPE_UNKNOWN, nil, err
}
return t, New(value), nil
}
func (c *Context) GetContextWithType(paths ...string) (SimpleType, *Context) {
t, v, _ := c.GetContextWithTypeE(paths...)
return t, v
}
func (c *Context) SetValue(path string, value interface{}) {
if path == "" || path == "." {
c.data = value
return
}
parts := strings.Split(path, ".")
c.data = setValueRecursive(c.data, parts, value)
}
// TODO: Merge
// func (c *Context) Merge(value interface{}, deep bool, ommitEmpty bool) {
// }
func (c *Context) GetContextE(path string) (*Context, error) {
v, err := c.GetValueE(path)
if err != nil {
return nil, err
}
return &Context{
data: v,
}, nil
}
func (c *Context) GetContext(path string) *Context {
return &Context{
data: c.GetValue(path),
}
}
// Test for empty values
func (c *Context) IsEmpty(paths ...string) bool {
v, err := c.GetValueE(paths...)
if err != nil {
return true
}
t, m, l, s, e := parseValue(v)
if e != nil {
return true
}
if t == TYPE_MAP {
return len(m) == 0
}
if t == TYPE_LIST {
return len(l) == 0
}
if t == TYPE_SCALAR {
// if t.
switch tt := s.(type) {
case bool:
return !tt
case string:
return tt == ""
case int:
return tt == 0
case int8:
return tt == 0
case int16:
return tt == 0
case int32:
return tt == 0
case int64:
return tt == 0
case uint:
return tt == 0
case uint8:
return tt == 0
case uint16:
return tt == 0
case uint32:
return tt == 0
case uint64:
return tt == 0
case float32:
return tt == 0
case float64:
return tt == 0
}
return true
}
return true
}
func (c *Context) Unmarshal(i interface{}) error {
b, err := json.Marshal(c.data)
if err != nil {
return err
}
return json.Unmarshal(b, i)
}
func (c *Context) UnmarshalJSON(jsonData []byte) error {
var data interface{}
json.Unmarshal(jsonData, &data)
c.data = data
return nil
}
func (c Context) MarshalJSON() ([]byte, error) {
return json.Marshal(c.data)
}
func (c Context) MustMarshalJSON() []byte {
b, _ := json.Marshal(c.data)
return b
}
func (c *Context) Exist(path string) bool {
_, err := c.GetValueE(path)
return err == nil
}
func setValueRecursive(data interface{}, path []string, value interface{}) map[string]interface{} {
current := path[0]
_, m, _, _, _ := parseValue(data)
dataMap := m
if dataMap == nil {
dataMap = make(map[string]interface{})
}
if len(path) == 1 {
if valueAsContext, ok := value.(*Context); ok {
if valueAsContext == nil {
dataMap[current] = nil
} else {
dataMap[current] = valueAsContext.GetValue(".")
}
} else {
dataMap[current] = value
}
} else {
nextData, ok := dataMap[current]
var nextDataMap map[string]interface{}
if !ok {
nextData = make(map[string]interface{})
} else {
nextDataMap, ok = nextData.(map[string]interface{})
if !ok {
nextData = make(map[string]interface{})
}
}
dataMap[current] = setValueRecursive(nextDataMap, path[1:], value)
}
return dataMap
}
type SimpleType uint8
const (
TYPE_UNKNOWN SimpleType = iota
TYPE_MAP
TYPE_LIST
TYPE_SCALAR
)
func parseValue(data interface{}) (SimpleType, map[string]interface{}, []interface{}, interface{}, error) {
if asContextRef, ok := data.(*Context); ok {
data = asContextRef.GetValue("")
}
if asContext, ok := data.(Context); ok {
data = asContext.GetValue("")
}
ref := reflect.ValueOf(data)
kind := ref.Kind()
if kind == reflect.Struct {
// struct => map
numField := ref.NumField()
result := make(map[string]interface{})
for i := 0; i < numField; i++ {
fieldName := ref.Type().Field(i).Name
fieldValue := ref.Field(i).Interface()
result[fieldName] = fieldValue
}
return TYPE_MAP, result, nil, nil, nil
} else if kind == reflect.Map {
// map => map
result := make(map[string]interface{})
for _, k := range ref.MapKeys() {
result[k.String()] = ref.MapIndex(k).Interface()
}
return TYPE_MAP, result, nil, nil, nil
} else if kind == reflect.Slice {
// slice => slice
length := ref.Len()
result := make([]interface{}, ref.Len())
for i := 0; i < length; i++ {
result[i] = ref.Index(i).Interface()
}
return TYPE_LIST, nil, result, nil, nil
} else {
// scalar
return TYPE_SCALAR, nil, nil, data, nil
}
}