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equal.go
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equal.go
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package jsondiff
import (
"encoding/json"
"strconv"
)
// jsonValueType represents the type of JSON value.
// It follows the types of values stored by json.Unmarshal
// in interface values.
type jsonValueType uint
const (
jsonInvalid jsonValueType = iota
jsonNull
jsonString
jsonBoolean
jsonNumberFloat
jsonNumberString
jsonArray
jsonObject
)
// jsonTypeSwitch returns the JSON type of the value
// held by the interface using a type switch statement.
func jsonTypeSwitch(i interface{}) jsonValueType {
switch i.(type) {
case nil:
return jsonNull
case string:
return jsonString
case bool:
return jsonBoolean
case float64:
return jsonNumberFloat
case json.Number:
return jsonNumberString
case []interface{}:
return jsonArray
case map[string]interface{}:
return jsonObject
default:
return jsonInvalid
}
}
// areComparable returns whether the interface values
// i1 and i2 can be compared. The values are comparable
// only if they are both non-nil and share the same kind.
func areComparable(i1, i2 interface{}) bool {
return jsonTypeSwitch(i1) == jsonTypeSwitch(i2)
}
func deepEqual(src, tgt interface{}) bool {
if src == nil && tgt == nil {
// Fast path.
return true
}
return deepEqualValue(src, tgt)
}
func deepEqualValue(src, tgt interface{}) bool {
typ := jsonTypeSwitch(src)
if typ != jsonTypeSwitch(tgt) {
return false
}
switch typ {
case jsonNull:
return true
case jsonString:
return src.(string) == tgt.(string)
case jsonBoolean:
return src.(bool) == tgt.(bool)
case jsonNumberFloat:
return src.(float64) == tgt.(float64)
case jsonNumberString:
return src.(json.Number) == tgt.(json.Number)
case jsonArray:
oarr := src.([]interface{})
narr := tgt.([]interface{})
if len(oarr) != len(narr) {
return false
}
for i := 0; i < len(oarr); i++ {
if !deepEqual(oarr[i], narr[i]) {
return false
}
}
return true
case jsonObject:
oobj := src.(map[string]interface{})
nobj := tgt.(map[string]interface{})
if len(oobj) != len(nobj) {
return false
}
for k, v1 := range oobj {
v2, ok := nobj[k]
if !ok {
// Key not found in target.
return false
}
if !deepEqual(v1, v2) {
return false
}
}
return true
default:
panic("invalid json type")
}
}
var jsonTypeNames = []string{
jsonInvalid: "Invalid",
jsonBoolean: "Boolean",
jsonNumberFloat: "Number",
jsonNumberString: "json.Number",
jsonString: "String",
jsonNull: "Null",
jsonObject: "Object",
jsonArray: "Array",
}
// String implements fmt.Stringer for jsonValueType.
func (t jsonValueType) String() string {
if uint(t) < uint(len(jsonTypeNames)) {
return jsonTypeNames[t]
}
return "type" + strconv.Itoa(int(t))
}