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/*
* Copyright 2021 ByteDance Inc.
*
* 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.
*/
package encoder
import (
`encoding/json`
`io`
)
// StreamEncoder uses io.Writer as input.
type StreamEncoder struct {
w io.Writer
Encoder
}
// NewStreamEncoder adapts to encoding/json.NewDecoder API.
//
// NewStreamEncoder returns a new encoder that write to w.
func NewStreamEncoder(w io.Writer) *StreamEncoder {
return &StreamEncoder{w: w}
}
// Encode encodes interface{} as JSON to io.Writer
func (enc *StreamEncoder) Encode(val interface{}) (err error) {
out := newBytes()
/* encode into the buffer */
err = EncodeInto(&out, val, enc.Opts)
if err != nil {
goto free_bytes
}
if enc.indent != "" || enc.prefix != "" {
/* indent the JSON */
buf := newBuffer()
err = json.Indent(buf, out, enc.prefix, enc.indent)
if err != nil {
freeBuffer(buf)
goto free_bytes
}
// according to standard library, terminate each value with a newline...
buf.WriteByte('\n')
/* copy into io.Writer */
_, err = io.Copy(enc.w, buf)
if err != nil {
freeBuffer(buf)
goto free_bytes
}
} else {
/* copy into io.Writer */
var n int
for len(out) > 0 {
n, err = enc.w.Write(out)
out = out[n:]
if err != nil {
goto free_bytes
}
}
// according to standard library, terminate each value with a newline...
enc.w.Write([]byte{'\n'})
}
free_bytes:
freeBytes(out)
return err
}
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