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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 subst
import (
"bytes"
"encoding/json"
"fmt"
)
// JSON attempts to serialize its input with a fallback to Go '%#v'
// serialization.
func JSON(x interface{}) string {
js, err := JSONMarshal(&x)
if err != nil {
js, _ = JSONMarshal(map[string]interface{}{
fmt.Sprintf("%T", x): fmt.Sprintf("%#v", x),
})
}
return string(js)
}
// JSONMarshal exists to SetEscapeHTML(false) to avoid messing with <,
// >, and &.
//
// Strangely (to me), SetEscapeHTML(false) also seems to change
// newline treatment. See TestJSONMarshal's 'newline' test.
func JSONMarshal(x interface{}) ([]byte, error) {
var (
buf = &bytes.Buffer{}
enc = json.NewEncoder(buf)
)
enc.SetEscapeHTML(false)
err := enc.Encode(x)
if err != nil {
return nil, err
}
bs := buf.Bytes()
if 0 < len(bs) {
if bs[len(bs)-1] == 0x0a {
bs = bs[0 : len(bs)-1]
}
}
return bs, nil
}