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package json
import (
"bytes"
"fmt"
"math"
"strconv"
"strings"
"time"
)
const JSON_DATE_FORMAT = "2006-01-02T15:04:05.000Z"
func (b BinData) MarshalJSON() ([]byte, error) {
data := fmt.Sprintf(`{ "$binary": "%v", "$type": "%0x" }`,
b.Base64, []byte{b.Type})
return []byte(data), nil
}
func (d128 Decimal128) MarshalJSON() ([]byte, error) {
s := d128.Decimal128.String()
return []byte(fmt.Sprintf(`{ "$numberDecimal" : "%s" }`, s)), nil
}
func (js JavaScript) MarshalJSON() ([]byte, error) {
data := []byte(fmt.Sprintf(`{ "$code": %q`, js.Code))
scopeChunk := []byte{}
var err error
if js.Scope != nil {
scopeChunk, err = Marshal(js.Scope)
if err != nil {
return nil, err
}
scopeChunk = []byte(fmt.Sprintf(`, "$scope": %v `, string(scopeChunk)))
}
scopeChunk = append(scopeChunk, '}')
data = append(data, scopeChunk...)
return data, nil
}
func (d Date) MarshalJSON() ([]byte, error) {
var data string
n := int64(d)
if d.isFormatable() {
t := time.Unix(n/1e3, n%1e3*1e6)
data = fmt.Sprintf(`{ "$date": "%v" }`, t.UTC().Format(JSON_DATE_FORMAT))
} else {
data = fmt.Sprintf(`{ "$date": { "$numberLong" : "%v" }}`, n)
}
return []byte(data), nil
}
func (d DBRef) MarshalJSON() ([]byte, error) {
// Convert the $id field to JSON
idChunk, err := Marshal(d.Id)
if err != nil {
return nil, err
}
// Need to form JSON like { "$ref": "REF", "$id": ID, "$db": "DB" }
// so piece chunks together since can only get $id field as bytes.
refChunk := []byte(fmt.Sprintf(`{ "$ref": "%v", "$id": `, d.Collection))
dbChunk := []byte{}
if d.Database != "" {
dbChunk = []byte(fmt.Sprintf(`, "$db": "%v" `, d.Database))
}
dbChunk = append(dbChunk, '}')
data := make([]byte, len(refChunk)+len(idChunk)+len(dbChunk))
copy(data, refChunk)
copy(data[len(refChunk):], idChunk)
copy(data[len(refChunk)+len(idChunk):], dbChunk)
return data, nil
}
func (d DBPointer) MarshalJSON() ([]byte, error) {
buffer := bytes.Buffer{}
// Convert the $id field to JSON
idChunk, err := Marshal(d.Id)
if err != nil {
return nil, err
}
buffer.Write([]byte(fmt.Sprintf(`{ "$ref": "%v", "$id": { "$oid" : `, d.Namespace)))
buffer.Write(idChunk)
buffer.Write([]byte("}}"))
return buffer.Bytes(), nil
}
func (_ MinKey) MarshalJSON() ([]byte, error) {
data := `{ "$minKey": 1 }`
return []byte(data), nil
}
func (_ MaxKey) MarshalJSON() ([]byte, error) {
data := `{ "$maxKey": 1 }`
return []byte(data), nil
}
func (n NumberInt) MarshalJSON() ([]byte, error) {
return []byte(strconv.FormatInt(int64(n), 10)), nil
}
func (n NumberLong) MarshalJSON() ([]byte, error) {
data := fmt.Sprintf(`{ "$numberLong": "%v" }`, int64(n))
return []byte(data), nil
}
func (n NumberFloat) MarshalJSON() ([]byte, error) {
// check floats for infinity and return +Infinity or -Infinity if so
if math.IsInf(float64(n), 1) {
return []byte("+Infinity"), nil
}
if math.IsInf(float64(n), -1) {
return []byte("-Infinity"), nil
}
floatString := strconv.FormatFloat(float64(n), 'g', -1, 64)
// determine if the float has a decimal point and if not
// add one to maintain consistency when importing.
if _, d := math.Modf(float64(n)); d == 0 {
// check for 'e' to determine if the float's formatted in scientific notation
if strings.IndexByte(floatString, 'e') == -1 {
return []byte(floatString + ".0"), nil
}
}
return []byte(floatString), nil
}
// Assumes that o represents a valid ObjectId
// (composed of 24 hexadecimal characters).
func (o ObjectId) MarshalJSON() ([]byte, error) {
data := fmt.Sprintf(`{ "$oid": "%v" }`, string(o))
return []byte(data), nil
}
func (r RegExp) MarshalJSON() ([]byte, error) {
pattern, err := Marshal(r.Pattern)
if err != nil {
return nil, err
}
data := fmt.Sprintf(`{ "$regex": %v, "$options": "%v" }`,
string(pattern), r.Options)
return []byte(data), nil
}
func (t Timestamp) MarshalJSON() ([]byte, error) {
data := fmt.Sprintf(`{ "$timestamp": { "t": %v, "i": %v } }`,
t.Seconds, t.Increment)
return []byte(data), nil
}
func (_ Undefined) MarshalJSON() ([]byte, error) {
data := `{ "$undefined": true }`
return []byte(data), nil
}
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