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241b21b0fd
Primary motivation is documentation, but it will also hopefully simplify the code. Also, * Lower case the default output format names; this is in line with the custom ones (map keys) and how it's treated all the places. This avoids doing `stringds.EqualFold` everywhere. Closes #10896 Closes #10620
117 lines
2.8 KiB
Go
117 lines
2.8 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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"github.com/gohugoio/hugo/common/hreflect"
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)
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// Regexp definitions
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var (
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keyMatchRegex = regexp.MustCompile(`\"(\w+)\":`)
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wordBarrierRegex = regexp.MustCompile(`(\w)([A-Z])`)
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)
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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 any
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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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type ReplacingJSONMarshaller struct {
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Value any
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KeysToLower bool
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OmitEmpty bool
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}
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func (c ReplacingJSONMarshaller) MarshalJSON() ([]byte, error) {
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converted, err := json.Marshal(c.Value)
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if c.KeysToLower {
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converted = keyMatchRegex.ReplaceAllFunc(
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converted,
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func(match []byte) []byte {
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return bytes.ToLower(match)
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},
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)
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}
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if c.OmitEmpty {
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// It's tricky to do this with a regexp, so convert it to a map, remove zero values and convert back.
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var m map[string]interface{}
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err = json.Unmarshal(converted, &m)
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if err != nil {
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return nil, err
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}
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var removeZeroVAlues func(m map[string]any)
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removeZeroVAlues = func(m map[string]any) {
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for k, v := range m {
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if !hreflect.IsTruthful(v) {
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delete(m, k)
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} else {
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switch v.(type) {
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case map[string]interface{}:
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removeZeroVAlues(v.(map[string]any))
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case []interface{}:
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for _, vv := range v.([]interface{}) {
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if m, ok := vv.(map[string]any); ok {
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removeZeroVAlues(m)
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}
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}
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}
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}
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}
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}
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removeZeroVAlues(m)
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converted, err = json.Marshal(m)
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}
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return converted, err
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}
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