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output_json.go
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/
output_json.go
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// Copyright © 2019 The Homeport Team
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package neat
import (
"encoding/json"
"fmt"
"strconv"
"strings"
"time"
yamlv2 "gopkg.in/yaml.v2"
yamlv3 "gopkg.in/yaml.v3"
"github.com/gonvenience/bunt"
)
// ToJSONString marshals the provided object into JSON with text decorations
// and is basically just a convenience function to create the output processor
// and call its `ToJSON` function.
func ToJSONString(obj interface{}) (string, error) {
return NewOutputProcessor(true, true, &DefaultColorSchema).ToCompactJSON(obj)
}
// ToJSON processes the provided input object and tries to neatly output it as
// human readable JSON honoring the preferences provided to the output processor
func (p *OutputProcessor) ToJSON(obj interface{}) (string, error) {
return p.neatJSON("", obj)
}
// ToCompactJSON processed the provided input object and tries to create a as
// compact as possible output
func (p *OutputProcessor) ToCompactJSON(obj interface{}) (string, error) {
switch tobj := obj.(type) {
case *yamlv3.Node:
return p.ToCompactJSON(*tobj)
case yamlv3.Node:
switch tobj.Kind {
case yamlv3.DocumentNode:
return p.ToCompactJSON(tobj.Content[0])
case yamlv3.MappingNode:
tmp := []string{}
for i := 0; i < len(tobj.Content); i += 2 {
k, v := tobj.Content[i], tobj.Content[i+1]
key, err := p.ToCompactJSON(k)
if err != nil {
return "", err
}
value, err := p.ToCompactJSON(v)
if err != nil {
return "", err
}
tmp = append(tmp, fmt.Sprintf("%s: %s", key, value))
}
return fmt.Sprintf("{%s}", strings.Join(tmp, ", ")), nil
case yamlv3.SequenceNode:
tmp := []string{}
for _, e := range tobj.Content {
entry, err := p.ToCompactJSON(e)
if err != nil {
return "", err
}
tmp = append(tmp, entry)
}
return fmt.Sprintf("[%s]", strings.Join(tmp, ", ")), nil
case yamlv3.ScalarNode:
obj, err := cast(tobj)
if err != nil {
return "", err
}
bytes, err := json.Marshal(obj)
if err != nil {
return "", err
}
return string(bytes), nil
}
case []interface{}:
result := make([]string, 0)
for _, i := range tobj {
value, err := p.ToCompactJSON(i)
if err != nil {
return "", err
}
result = append(result, value)
}
return fmt.Sprintf("[%s]", strings.Join(result, ", ")), nil
case yamlv2.MapSlice:
result := make([]string, 0)
for _, i := range tobj {
value, err := p.ToCompactJSON(i)
if err != nil {
return "", err
}
result = append(result, value)
}
return fmt.Sprintf("{%s}", strings.Join(result, ", ")), nil
case yamlv2.MapItem:
key, keyError := p.ToCompactJSON(tobj.Key)
if keyError != nil {
return "", keyError
}
value, valueError := p.ToCompactJSON(tobj.Value)
if valueError != nil {
return "", valueError
}
return fmt.Sprintf("%s: %s", key, value), nil
}
bytes, err := json.Marshal(obj)
if err != nil {
return "", err
}
return string(bytes), nil
}
func (p *OutputProcessor) neatJSON(prefix string, obj interface{}) (string, error) {
var err error
switch t := obj.(type) {
case yamlv3.Node:
err = p.neatJSONofNode(prefix, &t)
case *yamlv3.Node:
err = p.neatJSONofNode(prefix, t)
case yamlv2.MapSlice:
err = p.neatJSONofYAMLMapSlice(prefix, t)
case []interface{}:
err = p.neatJSONofSlice(prefix, t)
default:
err = p.neatJSONofScalar(prefix, obj)
}
if err != nil {
return "", err
}
p.out.Flush()
return p.data.String(), nil
}
func (p *OutputProcessor) neatJSONofNode(prefix string, node *yamlv3.Node) error {
var (
optionalLineBreak = func() string {
switch node.Style {
case yamlv3.FlowStyle:
return ""
}
return "\n"
}
optionalIndentPrefix = func() string {
switch node.Style {
case yamlv3.FlowStyle:
return ""
}
return prefix + p.prefixAdd()
}
optionalPrefixBeforeEnd = func() string {
switch node.Style {
case yamlv3.FlowStyle:
return ""
}
return prefix
}
)
switch node.Kind {
case yamlv3.DocumentNode:
return p.neatJSONofNode(prefix, node.Content[0])
case yamlv3.MappingNode:
if len(node.Content) == 0 {
fmt.Fprint(p.out, p.colorize("{}", "emptyStructures"))
return nil
}
bunt.Fprint(p.out, "*{*", optionalLineBreak())
for i := 0; i < len(node.Content); i += 2 {
k, v := followAlias(node.Content[i]), followAlias(node.Content[i+1])
fmt.Fprint(p.out,
optionalIndentPrefix(),
p.colorize(`"`+k.Value+`"`, "keyColor"), ": ",
)
if p.isScalar(v) {
if _, err := p.neatJSON("", v); err != nil {
return err
}
} else {
if _, err := p.neatJSON(prefix+p.prefixAdd(), v); err != nil {
return err
}
}
if i < len(node.Content)-2 {
fmt.Fprint(p.out, ",")
}
fmt.Fprint(p.out, optionalLineBreak())
}
bunt.Fprint(p.out, optionalPrefixBeforeEnd(), "*}*")
case yamlv3.SequenceNode:
if len(node.Content) == 0 {
fmt.Fprint(p.out, p.colorize("[]", "emptyStructures"))
return nil
}
bunt.Fprint(p.out, "*[*", optionalLineBreak())
for i := range node.Content {
entry := followAlias(node.Content[i])
if p.isScalar(entry) {
if _, err := p.neatJSON(optionalIndentPrefix(), entry); err != nil {
return err
}
} else {
fmt.Fprint(p.out, prefix, p.prefixAdd())
if _, err := p.neatJSON(prefix+p.prefixAdd(), entry); err != nil {
return err
}
}
if i < len(node.Content)-1 {
fmt.Fprint(p.out, ",")
}
fmt.Fprint(p.out, optionalLineBreak())
}
bunt.Fprint(p.out, optionalPrefixBeforeEnd(), "*]*")
case yamlv3.ScalarNode:
obj, err := cast(*node)
if err != nil {
return err
}
bytes, err := json.Marshal(obj)
if err != nil {
return err
}
fmt.Fprint(p.out,
prefix,
p.colorize(
string(bytes),
p.determineColorByType(node),
))
}
return nil
}
func (p *OutputProcessor) neatJSONofYAMLMapSlice(prefix string, mapslice yamlv2.MapSlice) error {
if len(mapslice) == 0 {
_, _ = p.out.WriteString(p.colorize("{}", "emptyStructures"))
return nil
}
_, _ = p.out.WriteString(bunt.Style("{", bunt.Bold()))
_, _ = p.out.WriteString("\n")
for idx, mapitem := range mapslice {
keyString := fmt.Sprintf("\"%v\": ", mapitem.Key)
_, _ = p.out.WriteString(prefix + p.prefixAdd())
_, _ = p.out.WriteString(p.colorize(keyString, "keyColor"))
if p.isScalar(mapitem.Value) {
if err := p.neatJSONofScalar("", mapitem.Value); err != nil {
return err
}
} else {
if _, err := p.neatJSON(prefix+p.prefixAdd(), mapitem.Value); err != nil {
return err
}
}
if idx < len(mapslice)-1 {
_, _ = p.out.WriteString(",")
}
_, _ = p.out.WriteString("\n")
}
_, _ = p.out.WriteString(prefix)
_, _ = p.out.WriteString(bunt.Style("}", bunt.Bold()))
return nil
}
func (p *OutputProcessor) neatJSONofSlice(prefix string, list []interface{}) error {
if len(list) == 0 {
_, _ = p.out.WriteString(p.colorize("[]", "emptyStructures"))
return nil
}
_, _ = p.out.WriteString(bunt.Style("[", bunt.Bold()))
_, _ = p.out.WriteString("\n")
for idx, value := range list {
if p.isScalar(value) {
if err := p.neatJSONofScalar(prefix+p.prefixAdd(), value); err != nil {
return err
}
} else {
_, _ = p.out.WriteString(prefix + p.prefixAdd())
if _, err := p.neatJSON(prefix+p.prefixAdd(), value); err != nil {
return err
}
}
if idx < len(list)-1 {
_, _ = p.out.WriteString(",")
}
_, _ = p.out.WriteString("\n")
}
_, _ = p.out.WriteString(prefix)
_, _ = p.out.WriteString(bunt.Style("]", bunt.Bold()))
return nil
}
func (p *OutputProcessor) neatJSONofScalar(prefix string, obj interface{}) error {
if obj == nil {
_, _ = p.out.WriteString(p.colorize("null", "nullColor"))
return nil
}
data, err := json.Marshal(obj)
if err != nil {
return err
}
color := p.determineColorByType(obj)
_, _ = p.out.WriteString(prefix)
parts := strings.Split(string(data), "\\n")
for idx, part := range parts {
_, _ = p.out.WriteString(p.colorize(part, color))
if idx < len(parts)-1 {
_, _ = p.out.WriteString(p.colorize("\\n", "emptyStructures"))
}
}
return nil
}
func cast(node yamlv3.Node) (interface{}, error) {
if node.Kind != yamlv3.ScalarNode {
return nil, fmt.Errorf("invalid node kind to cast, must be a scalar node")
}
switch node.Tag {
case "!!str":
return node.Value, nil
case "!!timestamp":
return parseTime(node.Value)
case "!!int":
return strconv.Atoi(node.Value)
case "!!float":
return strconv.ParseFloat(node.Value, 64)
case "!!bool":
return strconv.ParseBool(node.Value)
case "!!null":
return nil, nil
default:
return nil, fmt.Errorf("unknown tag %s", node.Tag)
}
}
func parseTime(value string) (time.Time, error) {
// YAML Spec regarding timestamp: https://yaml.org/type/timestamp.html
var layouts = [...]string{
time.RFC3339,
"2006-01-02T15:04:05.999999999Z",
"2006-01-02t15:04:05.999999999-07:00",
"2006-01-02 15:04:05.999999999 07:00",
"2006-01-02 15:04:05.999999999",
"2006-01-02",
}
for _, layout := range layouts {
if result, err := time.Parse(layout, value); err == nil {
return result, nil
}
}
return time.Time{}, fmt.Errorf("value %q cannot be parsed as a timestamp", value)
}