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json.go
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json.go
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package printer
import (
"encoding/json"
"fmt"
"io"
"strings"
"github.com/SignorMercurio/limner/color"
)
type JsonPrinter struct {
jsonObj interface{}
}
func (jp *JsonPrinter) Print(buf string, w io.Writer) {
jsonBytes, _ := json.MarshalIndent(jp.jsonObj, "", " ")
for _, line := range strings.Split(string(jsonBytes), "\n") {
jp.printJson(line, w)
}
}
func NewJsonPrinter(jsonObj interface{}) *JsonPrinter {
return &JsonPrinter{
jsonObj: jsonObj,
}
}
// printJson prints a line to writer w in json format
func (jp *JsonPrinter) printJson(line string, w io.Writer) {
indentCnt := getIndent(line)
indent := toSpaces(indentCnt)
line = strings.TrimLeft(line, " ")
// { OR }(,) OR ](,)
if strings.HasPrefix(line, "{") || strings.HasPrefix(line, "}") || strings.HasPrefix(line, "]") {
fmt.Fprintf(w, "%s%s\n", indent, line)
return
}
// "key": { OR "key": [ OR "key": value(,) OR value(,)
splitted := strings.SplitN(line, ": ", 2)
key := splitted[0]
// value(,)
if len(splitted) == 1 {
fmt.Fprintf(w, "%s%s\n", indent, jp.colorValue(key))
return
}
value := splitted[1]
fmt.Fprintf(w, "%s%s: %s\n", indent, jp.colorKey(key), jp.colorValue(value))
}
// colorKey colorizes json keys
func (jp *JsonPrinter) colorKey(key string) string {
key = strings.TrimSuffix(key, ":")
key = strings.Trim(key, `"`)
return fmt.Sprint(color.Apply(key, keyColor))
}
// colorValue colorizes json values
func (jp *JsonPrinter) colorValue(value string) string {
switch value {
case "{", "[", "{}", "{},":
return value
}
format := "%s"
if jp.isString(value) {
format = `"%s"`
}
if strings.HasSuffix(value, ",") {
format += ","
}
value = strings.TrimRight(value, ",")
value = strings.Trim(value, `"`)
return fmt.Sprintf(format, color.Apply(value, getColorByValueType(value)))
}
// isString returns if the line is double quoted
func (jp *JsonPrinter) isString(line string) bool {
return strings.HasPrefix(line, `"`) && (strings.HasSuffix(line, `"`) || strings.HasSuffix(line, `",`))
}