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// Tideland Go Library - Generic JSON Processing - Value
//
// Copyright (C) 2017 Frank Mueller / Tideland / Oldenburg / Germany
//
// All rights reserved. Use of this source code is governed
// by the new BSD license.
package gjp
//--------------------
// IMPORTS
//--------------------
import (
"fmt"
"reflect"
"strconv"
)
//--------------------
// VALUE
//--------------------
// Value contains one JSON value.
type Value interface {
fmt.Stringer
// IsUndefined returns true if this value is undefined.
IsUndefined() bool
// AsString returns the value as string.
AsString(dv string) string
// AsInt returns the value as int.
AsInt(dv int) int
// AsFloat64 returns the value as float64.
AsFloat64(dv float64) float64
// AsBool returns the value as bool.
AsBool(dv bool) bool
// Equals compares a value with the passed one.
Equals(to Value) bool
}
// value implements Value.
type value struct {
raw interface{}
err error
}
// IsUndefined implements Value.
func (v *value) IsUndefined() bool {
return v.raw == nil
}
// AsString implements Value.
func (v *value) AsString(dv string) string {
if v.IsUndefined() {
return dv
}
switch tv := v.raw.(type) {
case string:
return tv
case int:
return strconv.Itoa(tv)
case float64:
return strconv.FormatFloat(tv, 'f', -1, 64)
case bool:
return strconv.FormatBool(tv)
}
return dv
}
// AsInt implements Value.
func (v *value) AsInt(dv int) int {
if v.IsUndefined() {
return dv
}
switch tv := v.raw.(type) {
case string:
i, err := strconv.Atoi(tv)
if err != nil {
return dv
}
return i
case int:
return tv
case float64:
return int(tv)
case bool:
if tv {
return 1
}
return 0
}
return dv
}
// AsFloat64 implements Value.
func (v *value) AsFloat64(dv float64) float64 {
if v.IsUndefined() {
return dv
}
switch tv := v.raw.(type) {
case string:
f, err := strconv.ParseFloat(tv, 64)
if err != nil {
return dv
}
return f
case int:
return float64(tv)
case float64:
return tv
case bool:
if tv {
return 1.0
}
return 0.0
}
return dv
}
// AsBool implements Value.
func (v *value) AsBool(dv bool) bool {
if v.IsUndefined() {
return dv
}
switch tv := v.raw.(type) {
case string:
b, err := strconv.ParseBool(tv)
if err != nil {
return dv
}
return b
case int:
return tv == 1
case float64:
return tv == 1.0
case bool:
return tv
}
return dv
}
// Equals implements Value.
func (v *value) Equals(to Value) bool {
vto, ok := to.(*value)
if !ok {
return false
}
if vv, ok := isValue(v.raw); ok {
if vtov, ok := isValue(vto.raw); ok {
return vv == vtov
}
}
return reflect.DeepEqual(v.raw, vto.raw)
}
// String implements fmt.Stringer.
func (v *value) String() string {
if v.IsUndefined() {
return "null"
}
return fmt.Sprintf("%v", v.raw)
}
// EOF
|
