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package ffjson
/**
* Copyright 2015 Paul Querna, Klaus Post
*
* 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.
*
*/
import (
"encoding/json"
"errors"
fflib "github.com/pquerna/ffjson/fflib/v1"
"io"
"reflect"
)
// This is a reusable encoder.
// It allows to encode many objects to a single writer.
// This should not be used by more than one goroutine at the time.
type Encoder struct {
buf fflib.Buffer
w io.Writer
enc *json.Encoder
}
// SetEscapeHTML specifies whether problematic HTML characters
// should be escaped inside JSON quoted strings.
// The default behavior is to escape &, <, and > to \u0026, \u003c, and \u003e
// to avoid certain safety problems that can arise when embedding JSON in HTML.
//
// In non-HTML settings where the escaping interferes with the readability
// of the output, SetEscapeHTML(false) disables this behavior.
func (enc *Encoder) SetEscapeHTML(on bool) {
enc.enc.SetEscapeHTML(on)
}
// NewEncoder returns a reusable Encoder.
// Output will be written to the supplied writer.
func NewEncoder(w io.Writer) *Encoder {
return &Encoder{w: w, enc: json.NewEncoder(w)}
}
// Encode the data in the supplied value to the stream
// given on creation.
// When the function returns the output has been
// written to the stream.
func (e *Encoder) Encode(v interface{}) error {
f, ok := v.(marshalerFaster)
if ok {
e.buf.Reset()
err := f.MarshalJSONBuf(&e.buf)
if err != nil {
return err
}
_, err = io.Copy(e.w, &e.buf)
return err
}
return e.enc.Encode(v)
}
// EncodeFast will unmarshal the data if fast marshall is available.
// This function can be used if you want to be sure the fast
// marshal is used or in testing.
// If you would like to have fallback to encoding/json you can use the
// regular Encode() method.
func (e *Encoder) EncodeFast(v interface{}) error {
_, ok := v.(marshalerFaster)
if !ok {
return errors.New("ffjson marshal not available for type " + reflect.TypeOf(v).String())
}
return e.Encode(v)
}
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