72 lines
1.1 KiB
Go
72 lines
1.1 KiB
Go
package errors
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import (
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"encoding/json"
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"fmt"
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"sort"
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)
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type (
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meta map[interface{}]interface{}
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)
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// returns max length of (string) keys and slcie of all strings
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func (m meta) StringKeys() (int, []string) {
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var (
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l, ml int
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key string
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kk = make([]string, 0, len(m))
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)
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// collecting keys so we can sort them to ensure
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// stable order and find out max length of the key
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for k := range m {
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switch c := k.(type) {
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case string:
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key = c
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case fmt.Stringer:
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key = c.String()
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default:
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continue
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}
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kk = append(kk, key)
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if l = len(key); l > ml {
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ml = l
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}
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}
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sort.Strings(kk)
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return ml, kk
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}
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func (m meta) AsString(key interface{}) string {
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if _, has := m[key]; has {
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if s, ok := m[key].(string); ok {
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return s
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}
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}
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return ""
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}
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func (m meta) AsInt(key interface{}) int {
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if _, has := m[key]; has {
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if s, ok := m[key].(int); ok {
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return s
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}
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}
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return 0
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}
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func (m meta) MarshalJSON() ([]byte, error) {
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o := make(map[string]interface{})
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_, kk := m.StringKeys()
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for _, k := range kk {
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o[k] = m[k]
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}
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return json.Marshal(o)
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}
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