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value.go
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value.go
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package gson
import "bytes"
import "sort"
import "fmt"
// Value abstractions for golang-native value.
type Value struct {
config *Config
data interface{}
}
// Data returns the golang data.
func (val *Value) Data() interface{} {
return val.data
}
// Tojson encode golang native value to json text.
func (val *Value) Tojson(jsn *Json) *Json {
out := jsn.data[jsn.n:cap(jsn.data)]
jsn.n += value2json(val.data, out, val.config)
return jsn
}
// Tocbor encode golang native into cbor binary.
func (val *Value) Tocbor(cbr *Cbor) *Cbor {
out := cbr.data[cbr.n:cap(cbr.data)]
cbr.n += value2cbor(val.data, out, val.config)
return cbr
}
// Tocollate encode golang native into binary-collation.
func (val *Value) Tocollate(clt *Collate) *Collate {
out := clt.data[clt.n:cap(clt.data)]
clt.n += gson2collate(val.data, out, val.config)
return clt
}
// ListPointers all possible pointers in value.
func (val *Value) ListPointers(ptrs []string) []string {
bufn := val.config.bufferh.getbuffer(val.config.ptrlen)
ptrs = allpaths(val.data, ptrs, bufn.data[:0])
ptrs = append(ptrs, "")
val.config.bufferh.putbuffer(bufn)
return ptrs
}
// Get field or nested field specified by json pointer.
func (val *Value) Get(jptr *Jsonpointer) (item interface{}) {
return valGet(jptr.Segments(), val.data)
}
// Set field or nested field specified by json pointer. While
// `newval` is guaranteed to contain the `item`, `val` _may_ not be.
// Suggested usage,
// val := config.NewValue([]interface{}{"hello"})
// newval, _ = val.Set("/-", "world")
func (val *Value) Set(jptr *Jsonpointer, item interface{}) (newval, oldval interface{}) {
return valSet(jptr.Segments(), val.data, item)
}
// Delete field or nested field specified by json pointer. While
// `newval` is guaranteed to be updated, `val` _may_ not be.
// Suggested usage,
// val := NewValue([]interface{}{"hello", "world"})
// newval, _ = val.Delete("/1")
func (val *Value) Delete(jptr *Jsonpointer) (newval, deleted interface{}) {
return valDel(jptr.Segments(), val.data)
}
// Append item to end of an array pointed by json-pointer.
// returns `newval`, is guaranteed to be updated,
// val := NewValue([]interface{}{"hello", "world"})
// newval, _ = val.Append("", "welcome")
func (val *Value) Append(jptr *Jsonpointer, item interface{}) interface{} {
return valAppend(jptr.Segments(), val.data, item)
}
// Prepend an item to the beginning of an array.
// returns `newval`, is guaranteed to be updated,
// val := NewValue([]interface{}{"hello", "world"})
// newval, _ = val.Append("", "welcome")
func (val *Value) Prepend(jptr *Jsonpointer, item interface{}) interface{} {
return valPrepend(jptr.Segments(), val.data, item)
}
// Compare to value object.
func (val *Value) Compare(other *Value) int {
return valuecompare(val.data, other.data)
}
func valuecompare(v1, v2 interface{}) int {
t1, t2 := valueType(v1), valueType(v2)
if t1 < t2 {
return -1
} else if t1 > t2 {
return 1
} else {
switch t1 {
case TypeNull:
return 0
case TypeFalse:
if t2 == TypeTrue {
return -1
}
return 0
case TypeTrue:
if t2 == TypeFalse {
return 1
}
return 0
case TypeNumber:
cmp := cmpnumber(v1, v2)
return cmp
case TypeString:
b1 := str2bytes(v1.(string))
b2 := str2bytes(v2.(string))
return bytes.Compare(b1, b2)
case TypeArray:
a1, a2 := v1.([]interface{}), v2.([]interface{})
for i, item := range a1 {
if i > len(a2)-1 {
break
} else if cmp := valuecompare(item, a2[i]); cmp != 0 {
return cmp
}
}
if len(a1) < len(a2) {
return -1
} else if len(a1) > len(a2) {
return 1
}
return 0
case TypeObj:
o1 := v1.(map[string]interface{})
o2 := v2.(map[string]interface{})
switch {
case len(o1) < len(o2):
return -1
case len(o1) > len(o2):
return 1
}
keys1 := make([]string, 0)
for key := range o1 {
keys1 = append(keys1, key)
}
sort.Strings(keys1)
keys2 := make([]string, 0)
for key := range o2 {
keys2 = append(keys2, key)
}
sort.Strings(keys2)
for i, key1 := range keys1 {
key2 := keys2[i]
val1, val2 := o1[key1], o2[key2]
switch {
case key1 < key2:
return -1
case key1 > key2:
return 1
case key1 == key2:
cmp := valuecompare(val1, val2)
if cmp != 0 {
return cmp
}
}
}
return 0
}
}
panic(fmt.Errorf("unknown value type: %T", v1))
}
func valueType(data interface{}) byte {
if data == nil {
return TypeNull
}
switch v := data.(type) {
case bool:
if v == false {
return TypeFalse
}
return TypeTrue
case float64:
return TypeNumber
case int64, uint64, int, uint:
return TypeNumber
case string:
return TypeString
case []interface{}:
return TypeArray
case map[string]interface{}:
return TypeObj
}
panic(fmt.Errorf("unknown value type: %T", data))
}
func cmpnumber(n1, n2 interface{}) int {
switch v1 := n1.(type) {
case float64:
return float64t(v1).cmp(n2)
case int:
return int64t(v1).cmp(n2)
case int64:
return int64t(v1).cmp(n2)
case uint:
return uint64t(v1).cmp(n2)
case uint64:
return uint64t(v1).cmp(n2)
}
panic(fmt.Errorf("unknown value type: %T", n1))
}
type float64t float64
func (f float64t) cmp(other interface{}) int {
var rc int
switch {
case float64(f) < float64(int64(f)):
rc = -1
case float64(f) > float64(int64(f)):
rc = 1
}
switch val := other.(type) {
case float64:
if float64(f) < val {
return -1
} else if float64(f) == val {
return 0
}
return 1
case int64:
if v := int64(f); v < val {
return -1
} else if v == val {
return rc
}
return 1
case uint64:
if v := uint64(f); v < val {
return -1
} else if v == val {
return rc
}
return 1
}
panic(fmt.Errorf("cannot handle type %T", other))
}
type int64t int64
func (f int64t) cmp(other interface{}) int {
switch val := other.(type) {
case float64:
return -float64t(val).cmp(int64(f))
case int:
if int64(f) < int64(val) {
return -1
} else if int64(f) == int64(val) {
return 0
}
return 1
case int64:
if int64(f) < val {
return -1
} else if int64(f) == val {
return 0
}
return 1
case uint64:
if val >= 9223372036854775808 {
return -1
} else if v := int64(val); f < int64t(v) {
return -1
} else if f == int64t(v) {
return 0
}
return 1
}
panic(fmt.Errorf("cannot handle type %T", other))
}
type uint64t int64
func (f uint64t) cmp(other interface{}) int {
switch val := other.(type) {
case float64:
return -float64t(val).cmp(uint64(f))
case int64:
if val < 0 {
return 1
} else if v := int64(val); int64(f) < v {
return -1
} else if int64(f) == v {
return 0
}
return 1
case uint64:
if uint64(f) < val {
return -1
} else if uint64(f) == val {
return 0
}
return 1
}
panic(fmt.Errorf("cannot handle type %T", other))
}