增加go json
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70a1fe7c06
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ca6ced064e
497
tool/gojson/json-to-struct.go
Normal file
497
tool/gojson/json-to-struct.go
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@ -0,0 +1,497 @@
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// Package gojson ...
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//
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// Description : json_tool ...
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//
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// Author : go_developer@163.com<张德满>
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//
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// Date : 2022-01-09 10:48 PM
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package gojson
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"go/format"
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"io"
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"math"
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"reflect"
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"sort"
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"strconv"
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"strings"
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"unicode"
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"gopkg.in/yaml.v3"
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)
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var ForceFloats bool
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// commonInitialisms is a set of common initialisms.
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// Only add entries that are highly unlikely to be non-initialisms.
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// For instance, "ID" is fine (Freudian code is rare), but "AND" is not.
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var commonInitialisms = map[string]bool{
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"API": true,
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"ASCII": true,
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"CPU": true,
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"CSS": true,
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"DNS": true,
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"EOF": true,
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"GUID": true,
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"HTML": true,
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"HTTP": true,
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"HTTPS": true,
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"ID": true,
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"IP": true,
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"JSON": true,
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"LHS": true,
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"QPS": true,
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"RAM": true,
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"RHS": true,
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"RPC": true,
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"SLA": true,
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"SMTP": true,
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"SSH": true,
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"TLS": true,
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"TTL": true,
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"UI": true,
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"UID": true,
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"UUID": true,
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"URI": true,
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"URL": true,
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"UTF8": true,
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"VM": true,
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"XML": true,
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"NTP": true,
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"DB": true,
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}
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var intToWordMap = []string{
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"zero",
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"one",
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"two",
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"three",
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"four",
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"five",
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"six",
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"seven",
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"eight",
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"nine",
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}
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type Parser func(io.Reader) (interface{}, error)
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func ParseJson(input io.Reader) (interface{}, error) {
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var result interface{}
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if err := json.NewDecoder(input).Decode(&result); err != nil {
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return nil, err
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}
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return result, nil
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}
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func ParseYaml(input io.Reader) (interface{}, error) {
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var result interface{}
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b, err := readFile(input)
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if err != nil {
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return nil, err
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}
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if err := yaml.Unmarshal(b, &result); err != nil {
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return nil, err
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}
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return result, nil
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}
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func readFile(input io.Reader) ([]byte, error) {
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buf := bytes.NewBuffer(nil)
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_, err := io.Copy(buf, input)
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if err != nil {
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return []byte{}, nil
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}
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return buf.Bytes(), nil
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}
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// Generate a struct definition given a JSON string representation of an object and a name structName.
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func Generate(input io.Reader, parser Parser, structName, pkgName string, tags []string, subStruct bool, convertFloats bool) ([]byte, error) {
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var subStructMap map[string]string = nil
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if subStruct {
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subStructMap = make(map[string]string)
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}
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var result map[string]interface{}
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iresult, err := parser(input)
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if err != nil {
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return nil, err
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}
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switch iresult := iresult.(type) {
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case map[interface{}]interface{}:
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result = convertKeysToStrings(iresult)
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case map[string]interface{}:
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result = iresult
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case []interface{}:
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src := fmt.Sprintf("package %s\n\ntype %s %s\n",
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pkgName,
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structName,
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typeForValue(iresult, structName, tags, subStructMap, convertFloats))
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formatted, err := format.Source([]byte(src))
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if err != nil {
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err = fmt.Errorf("error formatting: %s, was formatting\n%s", err, src)
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}
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return formatted, err
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default:
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return nil, fmt.Errorf("unexpected type: %T", iresult)
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}
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src := fmt.Sprintf("package %s\ntype %s %s}",
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pkgName,
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structName,
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generateTypes(result, structName, tags, 0, subStructMap, convertFloats))
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keys := make([]string, 0, len(subStructMap))
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for key := range subStructMap {
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keys = append(keys, key)
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}
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sort.Strings(keys)
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for _, k := range keys {
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src = fmt.Sprintf("%v\n\ntype %v %v", src, subStructMap[k], k)
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}
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formatted, err := format.Source([]byte(src))
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if err != nil {
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err = fmt.Errorf("error formatting: %s, was formatting\n%s", err, src)
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}
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return formatted, err
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}
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func convertKeysToStrings(obj map[interface{}]interface{}) map[string]interface{} {
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res := make(map[string]interface{})
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for k, v := range obj {
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res[fmt.Sprintf("%v", k)] = v
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}
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return res
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}
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// Generate go struct entries for a map[string]interface{} structure
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func generateTypes(obj map[string]interface{}, structName string, tags []string, depth int, subStructMap map[string]string, convertFloats bool) string {
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structure := "struct {"
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keys := make([]string, 0, len(obj))
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for key := range obj {
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keys = append(keys, key)
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}
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sort.Strings(keys)
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for _, key := range keys {
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value := obj[key]
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valueType := typeForValue(value, structName, tags, subStructMap, convertFloats)
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//value = mergeElements(value)
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//If a nested value, recurse
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switch value := value.(type) {
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case []interface{}:
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if len(value) > 0 {
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sub := ""
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if v, ok := value[0].(map[interface{}]interface{}); ok {
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sub = generateTypes(convertKeysToStrings(v), structName, tags, depth+1, subStructMap, convertFloats) + "}"
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} else if v, ok := value[0].(map[string]interface{}); ok {
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sub = generateTypes(v, structName, tags, depth+1, subStructMap, convertFloats) + "}"
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}
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if sub != "" {
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subName := sub
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if subStructMap != nil {
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if val, ok := subStructMap[sub]; ok {
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subName = val
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} else {
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subName = fmt.Sprintf("%v_sub%v", structName, len(subStructMap)+1)
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subStructMap[sub] = subName
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}
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}
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valueType = "[]" + subName
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}
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}
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case map[interface{}]interface{}:
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sub := generateTypes(convertKeysToStrings(value), structName, tags, depth+1, subStructMap, convertFloats) + "}"
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subName := sub
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if subStructMap != nil {
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if val, ok := subStructMap[sub]; ok {
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subName = val
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} else {
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subName = fmt.Sprintf("%v_sub%v", structName, len(subStructMap)+1)
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subStructMap[sub] = subName
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}
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}
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valueType = subName
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case map[string]interface{}:
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sub := generateTypes(value, structName, tags, depth+1, subStructMap, convertFloats) + "}"
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subName := sub
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if subStructMap != nil {
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if val, ok := subStructMap[sub]; ok {
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subName = val
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} else {
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subName = fmt.Sprintf("%v_sub%v", structName, len(subStructMap)+1)
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subStructMap[sub] = subName
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}
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}
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valueType = subName
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}
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fieldName := FmtFieldName(key)
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tagList := make([]string, 0)
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for _, t := range tags {
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tagList = append(tagList, fmt.Sprintf("%s:\"%s\"", t, key))
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}
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structure += fmt.Sprintf("\n%s %s `%s`",
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fieldName,
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valueType,
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strings.Join(tagList, " "))
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}
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return structure
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}
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// FmtFieldName formats a string as a struct key
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//
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// Example:
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//
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// FmtFieldName("foo_id")
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//
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// Output: FooID
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func FmtFieldName(s string) string {
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runes := []rune(s)
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for len(runes) > 0 && !unicode.IsLetter(runes[0]) && !unicode.IsDigit(runes[0]) {
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runes = runes[1:]
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}
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if len(runes) == 0 {
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return "_"
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}
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s = stringifyFirstChar(string(runes))
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name := lintFieldName(s)
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runes = []rune(name)
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for i, c := range runes {
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ok := unicode.IsLetter(c) || unicode.IsDigit(c)
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if i == 0 {
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ok = unicode.IsLetter(c)
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}
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if !ok {
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runes[i] = '_'
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}
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}
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s = string(runes)
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s = strings.Trim(s, "_")
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if len(s) == 0 {
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return "_"
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}
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return s
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}
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func lintFieldName(name string) string {
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// Fast path for simple cases: "_" and all lowercase.
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if name == "_" {
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return name
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}
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allLower := true
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for _, r := range name {
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if !unicode.IsLower(r) {
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allLower = false
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break
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}
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}
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if allLower {
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runes := []rune(name)
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if u := strings.ToUpper(name); commonInitialisms[u] {
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copy(runes[0:], []rune(u))
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} else {
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runes[0] = unicode.ToUpper(runes[0])
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}
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return string(runes)
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}
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allUpperWithUnderscore := true
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for _, r := range name {
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if !unicode.IsUpper(r) && r != '_' {
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allUpperWithUnderscore = false
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break
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}
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}
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if allUpperWithUnderscore {
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name = strings.ToLower(name)
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}
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// Split camelCase at any lower->upper transition, and split on underscores.
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// Check each word for common initialisms.
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runes := []rune(name)
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w, i := 0, 0 // index of start of word, scan
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for i+1 <= len(runes) {
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eow := false // whether we hit the end of a word
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if i+1 == len(runes) {
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eow = true
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} else if runes[i+1] == '_' {
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// underscore; shift the remainder forward over any run of underscores
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eow = true
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n := 1
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for i+n+1 < len(runes) && runes[i+n+1] == '_' {
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n++
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}
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// Leave at most one underscore if the underscore is between two digits
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if i+n+1 < len(runes) && unicode.IsDigit(runes[i]) && unicode.IsDigit(runes[i+n+1]) {
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n--
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}
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copy(runes[i+1:], runes[i+n+1:])
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runes = runes[:len(runes)-n]
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} else if unicode.IsLower(runes[i]) && !unicode.IsLower(runes[i+1]) {
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// lower->non-lower
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eow = true
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}
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i++
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if !eow {
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continue
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}
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// [w,i) is a word.
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word := string(runes[w:i])
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if u := strings.ToUpper(word); commonInitialisms[u] {
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// All the common initialisms are ASCII,
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// so we can replace the bytes exactly.
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copy(runes[w:], []rune(u))
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} else if strings.ToLower(word) == word {
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// already all lowercase, and not the first word, so uppercase the first character.
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runes[w] = unicode.ToUpper(runes[w])
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}
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w = i
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}
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return string(runes)
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}
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// generate an appropriate struct type entry
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func typeForValue(value interface{}, structName string, tags []string, subStructMap map[string]string, convertFloats bool) string {
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//Check if this is an array
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if objects, ok := value.([]interface{}); ok {
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types := make(map[reflect.Type]bool, 0)
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for _, o := range objects {
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types[reflect.TypeOf(o)] = true
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}
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if len(types) == 1 {
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return "[]" + typeForValue(mergeElements(objects).([]interface{})[0], structName, tags, subStructMap, convertFloats)
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}
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return "[]interface{}"
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} else if object, ok := value.(map[interface{}]interface{}); ok {
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return generateTypes(convertKeysToStrings(object), structName, tags, 0, subStructMap, convertFloats) + "}"
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} else if object, ok := value.(map[string]interface{}); ok {
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return generateTypes(object, structName, tags, 0, subStructMap, convertFloats) + "}"
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} else if reflect.TypeOf(value) == nil {
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return "interface{}"
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}
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v := reflect.TypeOf(value).Name()
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if v == "float64" && convertFloats {
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v = disambiguateFloatInt(value)
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}
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return v
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}
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// All numbers will initially be read as float64
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// If the number appears to be an integer value, use int instead
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func disambiguateFloatInt(value interface{}) string {
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const epsilon = .0001
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vfloat := value.(float64)
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if !ForceFloats && math.Abs(vfloat-math.Floor(vfloat+epsilon)) < epsilon {
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var tmp int64
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return reflect.TypeOf(tmp).Name()
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}
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return reflect.TypeOf(value).Name()
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}
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// convert first character ints to strings
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func stringifyFirstChar(str string) string {
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first := str[:1]
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i, err := strconv.ParseInt(first, 10, 8)
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if err != nil {
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return str
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}
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return intToWordMap[i] + "_" + str[1:]
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}
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func mergeElements(i interface{}) interface{} {
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switch i := i.(type) {
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default:
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return i
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case []interface{}:
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l := len(i)
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if l == 0 {
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return i
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}
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for j := 1; j < l; j++ {
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i[0] = mergeObjects(i[0], i[j])
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}
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return i[0:1]
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}
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}
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func mergeObjects(o1, o2 interface{}) interface{} {
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if o1 == nil {
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return o2
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}
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if o2 == nil {
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return o1
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}
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if reflect.TypeOf(o1) != reflect.TypeOf(o2) {
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return nil
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}
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switch i := o1.(type) {
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default:
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return o1
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case []interface{}:
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if i2, ok := o2.([]interface{}); ok {
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i3 := append(i, i2...)
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return mergeElements(i3)
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}
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return mergeElements(i)
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case map[string]interface{}:
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if i2, ok := o2.(map[string]interface{}); ok {
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for k, v := range i2 {
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if v2, ok := i[k]; ok {
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i[k] = mergeObjects(v2, v)
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} else {
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i[k] = v
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}
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}
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}
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return i
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case map[interface{}]interface{}:
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if i2, ok := o2.(map[interface{}]interface{}); ok {
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for k, v := range i2 {
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if v2, ok := i[k]; ok {
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i[k] = mergeObjects(v2, v)
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} else {
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i[k] = v
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}
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}
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}
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return i
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}
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}
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