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value.go
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value.go
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package ycat
import (
"bytes"
"encoding/json"
"fmt"
"io"
"strings"
yaml "gopkg.in/yaml.v2"
)
// RawValue is a JSON string
type RawValue string
// Kind returns the value's type
func (v RawValue) Kind() ValueType {
if len(v) > 0 {
return kindOfJSON(v[0])
}
return Invalid
}
func (v RawValue) MarshalJSONString() string {
if v == "" {
return "null"
}
return string(v)
}
// UnmarshalJSON implements json.Unmarshaler for RawValue
func (v *RawValue) UnmarshalJSON(data []byte) error {
*v = RawValue(data)
return nil
}
var nullBytes = []byte(`null`)
// MarshalJSON implements json.Marshaler for RawValue
func (v RawValue) MarshalJSON() ([]byte, error) {
if v == "" {
return nullBytes, nil
}
return []byte(v), nil
}
func (v RawValue) String() string {
return string(v)
}
// Compact removes insignificant white space
func (v RawValue) Compact() (RawValue, error) {
if v == "" {
return v, nil
}
buf := bytes.NewBufferString(v.String())
buf.Reset()
if err := json.Compact(buf, []byte(v)); err != nil {
return "", err
}
return RawValue(buf.String()), nil
}
// RawValueArray joins RawValues to an array
func RawValueArray(values ...RawValue) RawValue {
w := strings.Builder{}
size := len(values) + 2
for _, v := range values {
size += len(v)
}
w.Grow(size)
w.WriteByte('[')
for i, v := range values {
if i > 0 {
w.WriteByte(',')
}
w.WriteString(string(v))
}
w.WriteByte(']')
return RawValue(w.String())
}
// MarshalJSONString marshals any value to JSON string
func MarshalJSONString(x interface{}) (string, error) {
w := strings.Builder{}
enc := json.NewEncoder(&w)
err := enc.Encode(x)
return w.String(), err
}
// NewRawValue creates a new RawValue from any value
func NewRawValue(x interface{}) (RawValue, error) {
if x, ok := x.(JSONStringMarshaler); ok {
v, err := x.MarshalJSONString()
return RawValue(v), err
}
v, err := MarshalJSONString(x)
return RawValue(v), err
}
// MarshalYAML implements yaml.Marshaler for RawValue
func (v RawValue) MarshalYAML() (x interface{}, err error) {
if v == "" {
return
}
r := strings.NewReader(string(v))
dec := json.NewDecoder(r)
dec.UseNumber()
x, err = decodeValue(dec)
if err != nil {
return
}
// YAML pkg doesn't like json.Number on top level
if n, ok := x.(json.Number); ok {
f, _ := n.Float64()
return f, nil
}
return
}
// UnmarshalYAML implements yaml.Unmarshaler for RawValue
func (v *RawValue) UnmarshalYAML(fn func(interface{}) error) (err error) {
var a []RawValue
if err = fn(&a); err == nil {
if a == nil {
*v = "[]"
} else {
*v = RawValueArray(a...)
}
return
}
var m yaml.MapSlice
if err = fn(&m); err == nil {
if m == nil {
*v = "{}"
} else {
*v, err = NewRawValue(Map(m))
}
return
}
var b bool
if err = fn(&b); err == nil {
if b {
*v = "true"
} else {
*v = "false"
}
return nil
}
var f float64
if err = fn(&f); err == nil {
var s string
if err = fn(&s); err == nil {
*v = RawValue(s)
return
}
*v, err = NewRawValue(f)
return
}
var s string
if err = fn(&s); err == nil {
*v, err = NewRawValue(s)
return
}
return
}
// Map wraps yaml.MapSlice to provide json Marshaler/Unmarshaller
type Map yaml.MapSlice
// NewMap creates a Map from key/value pairs
func NewMap(pairs ...interface{}) (m Map) {
var k, v interface{}
for len(pairs) >= 2 {
k, v, pairs = pairs[0], pairs[1], pairs[2:]
m = append(m, yaml.MapItem{
Key: k,
Value: v,
})
}
if m == nil {
return emptyMap()
}
return
}
// MarshalYAML implements yaml.Marshaler for Map
func (m Map) MarshalYAML() (interface{}, error) {
return yaml.MapSlice(m), nil
}
// UnmarshalYAML implements yaml.Unmarshaler for Map
func (m *Map) UnmarshalYAML(fn func(x interface{}) error) error {
return fn((*yaml.MapSlice)(m))
}
func decodeArray(dec *json.Decoder, arr []interface{}) ([]interface{}, error) {
for dec.More() {
v, err := decodeValue(dec)
if err != nil {
return arr, err
}
arr = append(arr, v)
}
// Consume closing token
_, err := dec.Token()
return arr, err
}
func decodeMap(dec *json.Decoder, m Map) (Map, error) {
for dec.More() {
token, err := dec.Token()
if err != nil {
return m, err
}
key, ok := token.(string)
if !ok {
return m, fmt.Errorf("Invalid JSON key token %v", token)
}
value, err := decodeValue(dec)
if err != nil {
return m, err
}
m = append(m, yaml.MapItem{Key: key, Value: value})
}
// Consume closing token
_, err := dec.Token()
return m, err
}
func emptyMap() Map {
return make([]yaml.MapItem, 0)
}
func decodeValue(dec *json.Decoder) (v interface{}, err error) {
token, err := dec.Token()
if err != nil {
return
}
if token == nil {
// Null value
return
}
switch token := token.(type) {
case json.Delim:
switch token {
case '[':
arr, err := decodeArray(dec, nil)
if err != nil {
return nil, err
}
if arr == nil {
arr = make([]interface{}, 0)
}
v = arr
case '{':
m, err := decodeMap(dec, nil)
if err != nil {
return nil, err
}
if m == nil {
m = emptyMap()
}
v = m
default:
return nil, fmt.Errorf("Invalid token %q", token)
}
default:
v = token
}
return
}
// UnmarshalJSON implements json.Unmarshaler for Map
func (m *Map) UnmarshalJSON(data []byte) (err error) {
r := bytes.NewReader(data)
dec := json.NewDecoder(r)
token, err := dec.Token()
if err != nil {
return
}
if token == nil {
*m = nil
return
}
if d, ok := token.(json.Delim); ok && d == '{' {
*m, err = decodeMap(dec, (*m)[:0])
if *m == nil {
*m = emptyMap()
}
return
}
err = fmt.Errorf("Invalid token %q", token)
return
}
type writer interface {
io.ByteWriter
io.Writer
}
type writerJSON interface {
writeJSON(enc *json.Encoder, w writer) error
}
func (m Map) writeJSON(enc *json.Encoder, w writer) (err error) {
if m == nil {
return enc.Encode(nil)
}
if err = w.WriteByte('{'); err != nil {
return
}
for i := range m {
if i > 0 {
if err = w.WriteByte(','); err != nil {
return
}
}
item := &m[i]
key, ok := item.Key.(string)
if !ok {
err = fmt.Errorf("Invalid key %v", item.Key)
return
}
if err = enc.Encode(key); err != nil {
return
}
if err = w.WriteByte(':'); err != nil {
return
}
if err = writeJSON(enc, w, item.Value); err != nil {
return
}
}
err = w.WriteByte('}')
return
}
func writeJSON(enc *json.Encoder, w writer, x interface{}) (err error) {
switch v := x.(type) {
case yaml.MapSlice:
if v == nil {
_, err = io.WriteString(w, "{}")
return
}
return Map(v).writeJSON(enc, w)
case Map:
return v.writeJSON(enc, w)
case []interface{}:
if v == nil {
return enc.Encode(nil)
}
if err = w.WriteByte('['); err != nil {
return
}
for i, v := range v {
if i > 0 {
if err = w.WriteByte(','); err != nil {
return
}
}
if err = writeJSON(enc, w, v); err != nil {
return
}
}
err = w.WriteByte(']')
return
default:
if jw, ok := v.(writerJSON); ok {
return jw.writeJSON(enc, w)
}
return enc.Encode(v)
}
}
//JSONStringMarshaler marshals to JSON string
type JSONStringMarshaler interface {
MarshalJSONString() (string, error)
}
// MarshalJSONString implements JSONStringMarshaler for Map
func (m Map) MarshalJSONString() (string, error) {
if m == nil {
return "null", nil
}
w := strings.Builder{}
enc := json.NewEncoder(&w)
if err := m.writeJSON(enc, &w); err != nil {
return "", err
}
return w.String(), nil
}
// MarshalJSON implements json.Marshaler for Map
func (m Map) MarshalJSON() ([]byte, error) {
if m == nil {
return nullBytes, nil
}
buf := bytes.NewBuffer(make([]byte, 0, 64))
enc := json.NewEncoder(buf)
if err := m.writeJSON(enc, buf); err != nil {
return nil, err
}
return buf.Bytes(), nil
}
// ValueType is the JSON type of a value
type ValueType int
// Value types
const (
Invalid ValueType = iota - 1
Null
Object
Array
String
Number
Boolean
)
func (t ValueType) String() string {
switch t {
case Object:
return "Object"
case Array:
return "Array"
case String:
return "String"
case Number:
return "Number"
case Boolean:
return "Boolean"
case Null:
return "Null"
default:
return "Invalid"
}
}
func kindOfJSON(c byte) ValueType {
switch c {
case '{':
return Object
case '[':
return Array
case '"':
return String
case 't', 'f':
return Boolean
case 'n':
return Null
case '.':
return Number
default:
if c -= '0'; 0 <= c && c <= 9 {
return Number
}
return Invalid
}
}