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|
// Package jsonpretty implements a terminal pretty-printer for JSON.
package jsonpretty
import (
"bytes"
"encoding/json"
"fmt"
"io"
"strings"
)
const (
colorDelim = "\x1b[1;38m" // bright white
colorKey = "\x1b[1;34m" // bright blue
colorNull = "\x1b[36m" // cyan
colorString = "\x1b[32m" // green
colorBool = "\x1b[33m" // yellow
colorReset = "\x1b[m"
)
// Format reads JSON from r and writes a prettified version of it to w.
func Format(w io.Writer, r io.Reader, indent string, colorize bool) error {
dec := json.NewDecoder(r)
dec.UseNumber()
c := func(ansi string) string {
if !colorize {
return ""
}
return ansi
}
var idx int
var stack []json.Delim
for {
t, err := dec.Token()
if err == io.EOF {
break
}
if err != nil {
return err
}
switch tt := t.(type) {
case json.Delim:
switch tt {
case '{', '[':
stack = append(stack, tt)
idx = 0
if _, err := fmt.Fprint(w, c(colorDelim), tt, c(colorReset)); err != nil {
return err
}
if dec.More() {
if _, err := fmt.Fprint(w, "\n", strings.Repeat(indent, len(stack))); err != nil {
return err
}
}
continue
case '}', ']':
stack = stack[:len(stack)-1]
idx = 0
if _, err := fmt.Fprint(w, c(colorDelim), tt, c(colorReset)); err != nil {
return err
}
}
default:
b, err := marshalJSON(tt)
if err != nil {
return err
}
isKey := len(stack) > 0 && stack[len(stack)-1] == '{' && idx%2 == 0
idx++
var color string
if isKey {
color = colorKey
} else if tt == nil {
color = colorNull
} else {
switch t.(type) {
case string:
color = colorString
case bool:
color = colorBool
}
}
if color != "" {
if _, err := fmt.Fprint(w, c(color)); err != nil {
return err
}
}
if _, err := w.Write(b); err != nil {
return err
}
if color != "" {
if _, err := fmt.Fprint(w, c(colorReset)); err != nil {
return err
}
}
if isKey {
if _, err := fmt.Fprint(w, c(colorDelim), ":", c(colorReset), " "); err != nil {
return err
}
continue
}
}
if dec.More() {
if _, err := fmt.Fprint(w, c(colorDelim), ",", c(colorReset), "\n", strings.Repeat(indent, len(stack))); err != nil {
return err
}
} else if len(stack) > 0 {
if _, err := fmt.Fprint(w, "\n", strings.Repeat(indent, len(stack)-1)); err != nil {
return err
}
} else {
if _, err := fmt.Fprint(w, "\n"); err != nil {
return err
}
}
}
return nil
}
// marshalJSON works like json.Marshal, but with HTML-escaping disabled.
func marshalJSON(v interface{}) ([]byte, error) {
buf := bytes.Buffer{}
enc := json.NewEncoder(&buf)
enc.SetEscapeHTML(false)
if err := enc.Encode(v); err != nil {
return nil, err
}
bb := buf.Bytes()
// omit trailing newline added by json.Encoder
if len(bb) > 0 && bb[len(bb)-1] == '\n' {
return bb[:len(bb)-1], nil
}
return bb, nil
}
|
