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gjson.go
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/
gjson.go
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// Copyright GoFrame Author(https://goframe.org). All Rights Reserved.
//
// This Source Code Form is subject to the terms of the MIT License.
// If a copy of the MIT was not distributed with this file,
// You can obtain one at https://github.com/gogf/gf.
// Package gjson provides convenient API for JSON/XML/INI/YAML/TOML data handling.
package gjson
import (
"reflect"
"strconv"
"strings"
"github.com/gogf/gf/v2/errors/gcode"
"github.com/gogf/gf/v2/errors/gerror"
"github.com/gogf/gf/v2/internal/reflection"
"github.com/gogf/gf/v2/internal/rwmutex"
"github.com/gogf/gf/v2/internal/utils"
"github.com/gogf/gf/v2/text/gstr"
"github.com/gogf/gf/v2/util/gconv"
)
const (
ContentTypeJson = `json`
ContentTypeJs = `js`
ContentTypeXml = `xml`
ContentTypeIni = `ini`
ContentTypeYaml = `yaml`
ContentTypeYml = `yml`
ContentTypeToml = `toml`
ContentTypeProperties = `properties`
)
const (
defaultSplitChar = '.' // Separator char for hierarchical data access.
)
// Json is the customized JSON struct.
type Json struct {
mu *rwmutex.RWMutex
p *interface{} // Pointer for hierarchical data access, it's the root of data in default.
c byte // Char separator('.' in default).
vc bool // Violence Check(false in default), which is used to access data when the hierarchical data key contains separator char.
}
// Options for Json object creating/loading.
type Options struct {
Safe bool // Mark this object is for in concurrent-safe usage. This is especially for Json object creating.
Tags string // Custom priority tags for decoding, eg: "json,yaml,MyTag". This is especially for struct parsing into Json object.
Type string // Type specifies the data content type, eg: json, xml, yaml, toml, ini.
StrNumber bool // StrNumber causes the Decoder to unmarshal a number into an interface{} as a string instead of as a float64.
}
// iInterfaces is used for type assert api for Interfaces().
type iInterfaces interface {
Interfaces() []interface{}
}
// iMapStrAny is the interface support for converting struct parameter to map.
type iMapStrAny interface {
MapStrAny() map[string]interface{}
}
// iVal is the interface for underlying interface{} retrieving.
type iVal interface {
Val() interface{}
}
// setValue sets `value` to `j` by `pattern`.
// Note:
// 1. If value is nil and removed is true, means deleting this value;
// 2. It's quite complicated in hierarchical data search, node creating and data assignment;
func (j *Json) setValue(pattern string, value interface{}, removed bool) error {
var (
err error
array = strings.Split(pattern, string(j.c))
length = len(array)
)
if value, err = j.convertValue(value); err != nil {
return err
}
// Initialization checks.
if *j.p == nil {
if gstr.IsNumeric(array[0]) {
*j.p = make([]interface{}, 0)
} else {
*j.p = make(map[string]interface{})
}
}
var (
pparent *interface{} = nil // Parent pointer.
pointer *interface{} = j.p // Current pointer.
)
j.mu.Lock()
defer j.mu.Unlock()
for i := 0; i < length; i++ {
switch (*pointer).(type) {
case map[string]interface{}:
if i == length-1 {
if removed && value == nil {
// Delete item from map.
delete((*pointer).(map[string]interface{}), array[i])
} else {
if (*pointer).(map[string]interface{}) == nil {
*pointer = map[string]interface{}{}
}
(*pointer).(map[string]interface{})[array[i]] = value
}
} else {
// If the key does not exit in the map.
if v, ok := (*pointer).(map[string]interface{})[array[i]]; !ok {
if removed && value == nil {
goto done
}
// Creating new node.
if gstr.IsNumeric(array[i+1]) {
// Creating array node.
n, _ := strconv.Atoi(array[i+1])
var v interface{} = make([]interface{}, n+1)
pparent = j.setPointerWithValue(pointer, array[i], v)
pointer = &v
} else {
// Creating map node.
var v interface{} = make(map[string]interface{})
pparent = j.setPointerWithValue(pointer, array[i], v)
pointer = &v
}
} else {
pparent = pointer
pointer = &v
}
}
case []interface{}:
// A string key.
if !gstr.IsNumeric(array[i]) {
if i == length-1 {
*pointer = map[string]interface{}{array[i]: value}
} else {
var v interface{} = make(map[string]interface{})
*pointer = v
pparent = pointer
pointer = &v
}
continue
}
// Numeric index.
valueNum, err := strconv.Atoi(array[i])
if err != nil {
err = gerror.WrapCodef(gcode.CodeInvalidParameter, err, `strconv.Atoi failed for string "%s"`, array[i])
return err
}
if i == length-1 {
// Leaf node.
if len((*pointer).([]interface{})) > valueNum {
if removed && value == nil {
// Deleting element.
if pparent == nil {
*pointer = append((*pointer).([]interface{})[:valueNum], (*pointer).([]interface{})[valueNum+1:]...)
} else {
j.setPointerWithValue(pparent, array[i-1], append((*pointer).([]interface{})[:valueNum], (*pointer).([]interface{})[valueNum+1:]...))
}
} else {
(*pointer).([]interface{})[valueNum] = value
}
} else {
if removed && value == nil {
goto done
}
if pparent == nil {
// It is the root node.
j.setPointerWithValue(pointer, array[i], value)
} else {
// It is not the root node.
s := make([]interface{}, valueNum+1)
copy(s, (*pointer).([]interface{}))
s[valueNum] = value
j.setPointerWithValue(pparent, array[i-1], s)
}
}
} else {
// Branch node.
if gstr.IsNumeric(array[i+1]) {
n, _ := strconv.Atoi(array[i+1])
pSlice := (*pointer).([]interface{})
if len(pSlice) > valueNum {
item := pSlice[valueNum]
if s, ok := item.([]interface{}); ok {
for i := 0; i < n-len(s); i++ {
s = append(s, nil)
}
pparent = pointer
pointer = &pSlice[valueNum]
} else {
if removed && value == nil {
goto done
}
var v interface{} = make([]interface{}, n+1)
pparent = j.setPointerWithValue(pointer, array[i], v)
pointer = &v
}
} else {
if removed && value == nil {
goto done
}
var v interface{} = make([]interface{}, n+1)
pparent = j.setPointerWithValue(pointer, array[i], v)
pointer = &v
}
} else {
pSlice := (*pointer).([]interface{})
if len(pSlice) > valueNum {
pparent = pointer
pointer = &(*pointer).([]interface{})[valueNum]
} else {
s := make([]interface{}, valueNum+1)
copy(s, pSlice)
s[valueNum] = make(map[string]interface{})
if pparent != nil {
// i > 0
j.setPointerWithValue(pparent, array[i-1], s)
pparent = pointer
pointer = &s[valueNum]
} else {
// i = 0
var v interface{} = s
*pointer = v
pparent = pointer
pointer = &s[valueNum]
}
}
}
}
// If the variable pointed to by the `pointer` is not of a reference type,
// then it modifies the variable via its the parent, ie: pparent.
default:
if removed && value == nil {
goto done
}
if gstr.IsNumeric(array[i]) {
n, _ := strconv.Atoi(array[i])
s := make([]interface{}, n+1)
if i == length-1 {
s[n] = value
}
if pparent != nil {
pparent = j.setPointerWithValue(pparent, array[i-1], s)
} else {
*pointer = s
pparent = pointer
}
} else {
var v1, v2 interface{}
if i == length-1 {
v1 = map[string]interface{}{
array[i]: value,
}
} else {
v1 = map[string]interface{}{
array[i]: nil,
}
}
if pparent != nil {
pparent = j.setPointerWithValue(pparent, array[i-1], v1)
} else {
*pointer = v1
pparent = pointer
}
v2 = v1.(map[string]interface{})[array[i]]
pointer = &v2
}
}
}
done:
return nil
}
// convertValue converts `value` to map[string]interface{} or []interface{},
// which can be supported for hierarchical data access.
func (j *Json) convertValue(value interface{}) (convertedValue interface{}, err error) {
if value == nil {
return
}
switch value.(type) {
case map[string]interface{}:
return value, nil
case []interface{}:
return value, nil
default:
var (
reflectInfo = reflection.OriginValueAndKind(value)
)
switch reflectInfo.OriginKind {
case reflect.Array:
return gconv.Interfaces(value), nil
case reflect.Slice:
return gconv.Interfaces(value), nil
case reflect.Map:
return gconv.Map(value), nil
case reflect.Struct:
if v, ok := value.(iMapStrAny); ok {
convertedValue = v.MapStrAny()
}
if utils.IsNil(convertedValue) {
if v, ok := value.(iInterfaces); ok {
convertedValue = v.Interfaces()
}
}
if utils.IsNil(convertedValue) {
convertedValue = gconv.Map(value)
}
if utils.IsNil(convertedValue) {
err = gerror.NewCodef(gcode.CodeInvalidParameter, `unsupported value type "%s"`, reflect.TypeOf(value))
}
return
default:
return value, nil
}
}
}
// setPointerWithValue sets `key`:`value` to `pointer`, the `key` may be a map key or slice index.
// It returns the pointer to the new value set.
func (j *Json) setPointerWithValue(pointer *interface{}, key string, value interface{}) *interface{} {
switch (*pointer).(type) {
case map[string]interface{}:
(*pointer).(map[string]interface{})[key] = value
return &value
case []interface{}:
n, _ := strconv.Atoi(key)
if len((*pointer).([]interface{})) > n {
(*pointer).([]interface{})[n] = value
return &(*pointer).([]interface{})[n]
} else {
s := make([]interface{}, n+1)
copy(s, (*pointer).([]interface{}))
s[n] = value
*pointer = s
return &s[n]
}
default:
*pointer = value
}
return pointer
}
// getPointerByPattern returns a pointer to the value by specified `pattern`.
func (j *Json) getPointerByPattern(pattern string) *interface{} {
if j.vc {
return j.getPointerByPatternWithViolenceCheck(pattern)
} else {
return j.getPointerByPatternWithoutViolenceCheck(pattern)
}
}
// getPointerByPatternWithViolenceCheck returns a pointer to the value of specified `pattern` with violence check.
func (j *Json) getPointerByPatternWithViolenceCheck(pattern string) *interface{} {
if !j.vc {
return j.getPointerByPatternWithoutViolenceCheck(pattern)
}
// It returns nil if pattern is empty.
if pattern == "" {
return nil
}
// It returns all if pattern is ".".
if pattern == "." {
return j.p
}
var (
index = len(pattern)
start = 0
length = 0
pointer = j.p
)
if index == 0 {
return pointer
}
for {
if r := j.checkPatternByPointer(pattern[start:index], pointer); r != nil {
if length += index - start; start > 0 {
length += 1
}
start = index + 1
index = len(pattern)
if length == len(pattern) {
return r
} else {
pointer = r
}
} else {
// Get the position for next separator char.
index = strings.LastIndexByte(pattern[start:index], j.c)
if index != -1 && length > 0 {
index += length + 1
}
}
if start >= index {
break
}
}
return nil
}
// getPointerByPatternWithoutViolenceCheck returns a pointer to the value of specified `pattern`, with no violence check.
func (j *Json) getPointerByPatternWithoutViolenceCheck(pattern string) *interface{} {
if j.vc {
return j.getPointerByPatternWithViolenceCheck(pattern)
}
// It returns nil if pattern is empty.
if pattern == "" {
return nil
}
// It returns all if pattern is ".".
if pattern == "." {
return j.p
}
pointer := j.p
if len(pattern) == 0 {
return pointer
}
array := strings.Split(pattern, string(j.c))
for k, v := range array {
if r := j.checkPatternByPointer(v, pointer); r != nil {
if k == len(array)-1 {
return r
} else {
pointer = r
}
} else {
break
}
}
return nil
}
// checkPatternByPointer checks whether there's value by `key` in specified `pointer`.
// It returns a pointer to the value.
func (j *Json) checkPatternByPointer(key string, pointer *interface{}) *interface{} {
switch (*pointer).(type) {
case map[string]interface{}:
if v, ok := (*pointer).(map[string]interface{})[key]; ok {
return &v
}
case []interface{}:
if gstr.IsNumeric(key) {
n, err := strconv.Atoi(key)
if err == nil && len((*pointer).([]interface{})) > n {
return &(*pointer).([]interface{})[n]
}
}
}
return nil
}