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util.go
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util.go
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/*
* Copyright 2021 Comcast Cable Communications Management, LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* SPDX-License-Identifier: Apache-2.0
*/
package dsl
import (
"encoding/json"
"fmt"
"strings"
"github.com/Comcast/plax/subst"
)
func JSON(x interface{}) string {
js, err := subst.JSONMarshal(&x)
if err != nil {
js, _ = subst.JSONMarshal(map[string]interface{}{
fmt.Sprintf("%T", x): fmt.Sprintf("%#v", x),
})
}
return string(js)
}
func MaybeParseJSON(x interface{}) interface{} {
if s, is := x.(string); is {
var y interface{}
if err := json.Unmarshal([]byte(s), &y); err == nil {
return y
}
}
return x
}
func MaybeSerialize(x interface{}) (string, error) {
if s, is := x.(string); is {
return s, nil
}
js, err := json.Marshal(&x)
if err != nil {
// We still return something useful, but we also
// return the error. Probably dumb.
return JSON(map[string]interface{}{
"error": err.Error(),
"on": fmt.Sprintf("%#v", x),
}), err
}
return string(js), nil
}
// Canon constructs a canonical (via JSON) representation.
func Canon(x interface{}) interface{} {
js, err := json.Marshal(&x)
if err != nil {
panic(err)
}
var y interface{}
if err = json.Unmarshal(js, &y); err != nil {
panic(err)
}
return y
}
// short returns a short version of the given string.
func short(s string) string {
limit := 30
s = strings.ReplaceAll(s, "\n", " ")
if limit < len(s)-3 {
return s[0:limit] + "..."
}
return s
}
// As is shameful.
func As(src interface{}, dst interface{}) error {
js, err := json.Marshal(&src)
if err != nil {
return err
}
return json.Unmarshal(js, &dst)
}