59 lines
1.6 KiB
Go
59 lines
1.6 KiB
Go
// Copyright 2019 The Hugo Authors. All rights reserved.
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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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// 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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package parser
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import (
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"bytes"
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"encoding/json"
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"regexp"
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"unicode"
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"unicode/utf8"
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)
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// Regexp definitions
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var keyMatchRegex = regexp.MustCompile(`\"(\w+)\":`)
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var wordBarrierRegex = regexp.MustCompile(`(\w)([A-Z])`)
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// Code adapted from https://gist.github.com/piersy/b9934790a8892db1a603820c0c23e4a7
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type LowerCaseCamelJSONMarshaller struct {
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Value interface{}
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}
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func (c LowerCaseCamelJSONMarshaller) MarshalJSON() ([]byte, error) {
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marshalled, err := json.Marshal(c.Value)
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converted := keyMatchRegex.ReplaceAllFunc(
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marshalled,
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func(match []byte) []byte {
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// Attributes on the form XML, JSON etc.
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if bytes.Equal(match, bytes.ToUpper(match)) {
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return bytes.ToLower(match)
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}
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// Empty keys are valid JSON, only lowercase if we do not have an
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// empty key.
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if len(match) > 2 {
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// Decode first rune after the double quotes
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r, width := utf8.DecodeRune(match[1:])
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r = unicode.ToLower(r)
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utf8.EncodeRune(match[1:width+1], r)
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}
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return match
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},
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)
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return converted, err
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}
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