126 lines
2.5 KiB
Go
126 lines
2.5 KiB
Go
package confection
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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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"reflect"
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"strings"
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)
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type (
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config struct {
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config interface{}
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}
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configField struct {
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Path string `json:"path"`
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Type string `json:"type"`
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Value interface{} `json:"value"`
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IsRequired bool `json:"is_required"`
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IsReadonly bool `json:"is_readonly"`
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Title string `json:"title"`
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Options []string `json:"options"`
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}
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)
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const (
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tJson = "json"
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tTitle = "title"
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tAttrs = "attrs"
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tOptions = "options"
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aRequired = "required"
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aReadonly = "readonly"
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aIgnored = "ignored"
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sep = ","
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)
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func (c *config) dump() ([]byte, error) {
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var (
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out bytes.Buffer
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b []byte
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err error
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)
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if b, err = json.Marshal(c.config); err != nil {
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return nil, err
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}
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// Indent with empty prefix and four spaces
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if err = json.Indent(&out, b, "", " "); err != nil {
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return nil, err
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}
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out.WriteByte('\n')
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return out.Bytes(), nil
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}
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// TODO: function is too heavy, needs refactor
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func (c *config) meta(prefix string) []*configField {
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var (
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fields = []*configField{}
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cval = reflect.ValueOf(c.config)
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ctyp = reflect.TypeOf(c.config)
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ckind = cval.Kind()
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)
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if ckind != reflect.Struct {
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panic(fmt.Errorf("Config is expected to be a Struct, not %s", ckind.String()))
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}
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loop_over_fields:
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for i := 0; i < cval.NumField(); i++ {
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var (
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field = ctyp.Field(i)
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val = cval.Field(i)
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kind = val.Kind()
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jsonKey = field.Tag.Get(tJson)
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path = strings.Join([]string{prefix, jsonKey}, "/")
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title = field.Tag.Get(tTitle)
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attrs = field.Tag.Get(tAttrs)
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options = field.Tag.Get(tOptions)
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cf = &configField{
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Path: path,
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Type: val.Kind().String(),
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Title: title,
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}
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)
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if title != "" || len(attrs) == 0 || len(options) == 0 {
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// Substitute field name for title if none set
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if kind != reflect.Struct {
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cf.Value = val.Interface()
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}
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if title == "" {
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cf.Title = field.Name
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}
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if len(options) > 0 {
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cf.Options = strings.Split(options, sep)
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}
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for _, attr := range strings.Split(attrs, sep) {
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if attr == aRequired {
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cf.IsRequired = true
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}
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if attr == aReadonly {
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cf.IsReadonly = true
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}
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if attr == aIgnored {
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continue loop_over_fields
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}
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}
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fields = append(fields, cf)
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}
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// Recursion here
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if kind == reflect.Struct {
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subconf := &config{
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config: val.Interface(),
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}
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fields = append(fields, subconf.meta(path)...)
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}
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}
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return fields
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}
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