85 lines
2.1 KiB
Go
85 lines
2.1 KiB
Go
/*
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* Copyright 2021 ByteDance Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package encoder
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import (
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`encoding/json`
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`io`
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)
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// StreamEncoder uses io.Writer as input.
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type StreamEncoder struct {
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w io.Writer
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Encoder
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}
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// NewStreamEncoder adapts to encoding/json.NewDecoder API.
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//
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// NewStreamEncoder returns a new encoder that write to w.
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func NewStreamEncoder(w io.Writer) *StreamEncoder {
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return &StreamEncoder{w: w}
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}
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// Encode encodes interface{} as JSON to io.Writer
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func (enc *StreamEncoder) Encode(val interface{}) (err error) {
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out := newBytes()
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/* encode into the buffer */
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err = EncodeInto(&out, val, enc.Opts)
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if err != nil {
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goto free_bytes
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}
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if enc.indent != "" || enc.prefix != "" {
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/* indent the JSON */
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buf := newBuffer()
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err = json.Indent(buf, out, enc.prefix, enc.indent)
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if err != nil {
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freeBuffer(buf)
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goto free_bytes
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}
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// according to standard library, terminate each value with a newline...
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buf.WriteByte('\n')
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/* copy into io.Writer */
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_, err = io.Copy(enc.w, buf)
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if err != nil {
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freeBuffer(buf)
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goto free_bytes
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}
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} else {
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/* copy into io.Writer */
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var n int
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for len(out) > 0 {
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n, err = enc.w.Write(out)
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out = out[n:]
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if err != nil {
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goto free_bytes
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}
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}
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// according to standard library, terminate each value with a newline...
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enc.w.Write([]byte{'\n'})
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}
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free_bytes:
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freeBytes(out)
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return err
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}
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