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// Copyright (C) MongoDB, Inc. 2014-present.
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License. You may obtain
// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
package json
import (
"go.mongodb.org/mongo-driver/bson"
"go.mongodb.org/mongo-driver/bson/primitive"
"fmt"
"reflect"
)
// Represents base-64 encoded binary data
type BinData struct {
Type byte
Base64 string
}
// Represents the number of milliseconds since the Unix epoch.
type Date int64
type ISODate string
type ObjectId string
// Represents a reference to another document.
type DBRef struct {
Collection string
Id interface{}
Database string // optional
}
// Refers to a document in some namespace by wrapping a string containing the namespace
// and the objectId in which the _id of the document is contained
type DBPointer struct {
Namespace string
Id primitive.ObjectID
}
// Represents the literal MinKey.
type MinKey struct{}
// Represents the literal MaxKey.
type MaxKey struct{}
// Represents a signed 32-bit integer.
type NumberInt int32
// Represents a signed 64-bit integer.
type NumberLong int64
// Represents a signed 64-bit float.
type NumberFloat float64
type Decimal128 struct {
primitive.Decimal128
}
// Represents a regular expression.
type RegExp struct {
Pattern string
Options string
}
// Represents a timestamp value.
type Timestamp struct {
Seconds uint32
Increment uint32
}
type JavaScript struct {
Code string
Scope interface{}
}
type Float float64
// Represents the literal undefined.
type Undefined struct{}
var (
// primitive types
byteType = reflect.TypeOf(byte(0))
stringType = reflect.TypeOf(string(""))
uint32Type = reflect.TypeOf(uint32(0))
// object types
binDataType = reflect.TypeOf(BinData{})
dateType = reflect.TypeOf(Date(0))
isoDateType = reflect.TypeOf(ISODate(""))
dbRefType = reflect.TypeOf(DBRef{})
dbPointerType = reflect.TypeOf(DBPointer{})
maxKeyType = reflect.TypeOf(MaxKey{})
minKeyType = reflect.TypeOf(MinKey{})
numberIntType = reflect.TypeOf(NumberInt(0))
numberLongType = reflect.TypeOf(NumberLong(0))
numberFloatType = reflect.TypeOf(NumberFloat(0))
objectIdType = reflect.TypeOf(ObjectId(""))
regexpType = reflect.TypeOf(RegExp{})
timestampType = reflect.TypeOf(Timestamp{})
undefinedType = reflect.TypeOf(Undefined{})
orderedBSONType = reflect.TypeOf(bson.D{})
interfaceType = reflect.TypeOf((*interface{})(nil))
)
func (d Date) isFormatable() bool {
return int64(d) < int64(32535215999000)
}
func stateBeginExtendedValue(s *scanner, c int) int {
switch c {
case 'u': // beginning of undefined
s.step = stateU
case 'B': // beginning of BinData or Boolean
s.step = stateB
case 'D': // beginning of Date
s.step = stateD
case 'I': // beginning of Infinity or ISODate
s.step = stateI
case 'M': // beginning of MinKey or MaxKey
s.step = stateM
case 'N': // beginning of NaN or NumberXX
s.step = stateUpperN
case 'O': // beginning of ObjectId
s.step = stateO
case 'R': // beginning of RegExp
s.step = stateR
case 'T': // beginning of Timestamp
s.step = stateUpperT
case '/': // beginning of /foo/i
s.step = stateInRegexpPattern
default:
return s.error(c, "looking for beginning of value")
}
return scanBeginLiteral
}
// stateB is the state after reading `B`.
func stateB(s *scanner, c int) int {
if c == 'i' {
s.step = stateBi
return scanContinue
}
if c == 'o' {
s.step = stateBo
return scanContinue
}
return s.error(c, "in literal BinData or Boolean (expecting 'i' or 'o')")
}
// stateUpperN is the state after reading `N`.
func stateUpperN(s *scanner, c int) int {
if c == 'a' {
s.step = stateUpperNa
return scanContinue
}
if c == 'u' {
s.step = stateUpperNu
return scanContinue
}
return s.error(c, "in literal NaN or Number (expecting 'a' or 'u')")
}
// stateM is the state after reading `M`.
func stateM(s *scanner, c int) int {
if c == 'a' {
s.step = stateUpperMa
return scanContinue
}
if c == 'i' {
s.step = stateUpperMi
return scanContinue
}
return s.error(c, "in literal MaxKey or MinKey (expecting 'a' or 'i')")
}
// stateD is the state after reading `D`.
func stateD(s *scanner, c int) int {
switch c {
case 'a':
s.step = stateDa
case 'B':
s.step = stateDB
case 'b':
s.step = stateDb
default:
return s.error(c, "in literal Date or DBRef (expecting 'a' or 'B')")
}
return scanContinue
}
// stateDB is the state after reading `DB`.
func stateDB(s *scanner, c int) int {
if c == 'R' {
s.step = stateDBR
return scanContinue
}
if c == 'P' {
s.step = stateDBP
return scanContinue
}
return s.error(c, "in state DB (expecting 'R or P')")
}
// stateI is the state after reading `I`.
func stateI(s *scanner, c int) int {
switch c {
case 'n':
s.step = stateIn
case 'S':
s.step = stateIS
default:
return s.error(c, "in literal Infinity or ISO (expecting 'n' or 'S')")
}
return scanContinue
}
// Decodes a literal stored in item into v.
func (d *decodeState) storeExtendedLiteral(item []byte, v reflect.Value, fromQuoted bool) bool {
switch c := item[0]; c {
case 'n':
d.storeNewLiteral(v, fromQuoted)
case 'u': // undefined
switch kind := v.Kind(); kind {
case reflect.Interface:
v.Set(reflect.ValueOf(Undefined{}))
default:
d.error(fmt.Errorf("cannot store %v value into %v type", undefinedType, kind))
}
case 'B': // BinData or Boolean
switch item[1] {
case 'i': // BinData
d.storeBinData(v)
case 'o': // Boolean
d.storeBoolean(v)
}
case 'D': // Date, DBRef, DBPointer, Dbpointer,or Dbref
switch item[1] {
case 'a': // Date
d.storeDate(v)
case 'b': // Dbref
d.storeDBRef(v)
case 'B': // DBRef or DBPointer
switch item[2] {
case 'R': //DBRef
d.storeDBRef(v)
case 'P': //DBPointer
d.storeDBPointer(v)
}
}
case 'I':
switch item[1] {
case 'S': // ISODate
d.storeISODate(v)
}
case 'M': // MinKey or MaxKey
switch item[1] {
case 'i': // MinKey
switch kind := v.Kind(); kind {
case reflect.Interface:
v.Set(reflect.ValueOf(MinKey{}))
default:
d.error(fmt.Errorf("cannot store %v value into %v type", minKeyType, kind))
}
case 'a': // MaxKey
switch kind := v.Kind(); kind {
case reflect.Interface:
v.Set(reflect.ValueOf(MaxKey{}))
default:
d.error(fmt.Errorf("cannot store %v value into %v type", maxKeyType, kind))
}
}
case 'O': // ObjectId
d.storeObjectId(v)
case 'N': // NumberInt or NumberLong
switch item[6] {
case 'I': // NumberInt
d.storeNumberInt(v)
case 'L': // NumberLong
d.storeNumberLong(v)
}
case 'R': // RegExp constructor
d.storeRegexp(v)
case 'T': // Timestamp
d.storeTimestamp(v)
case '/': // regular expression literal
op := d.scanWhile(scanSkipSpace)
if op != scanRegexpPattern {
d.error(fmt.Errorf("expected beginning of regular expression pattern"))
}
pattern, options, err := d.regexp()
if err != nil {
d.error(err)
}
switch kind := v.Kind(); kind {
case reflect.Interface:
v.Set(reflect.ValueOf(RegExp{pattern, options}))
default:
d.error(fmt.Errorf("cannot store %v value into %v type", regexpType, kind))
}
default:
return false
}
return true
}
// Returns a literal from the underlying byte data.
func (d *decodeState) getExtendedLiteral(item []byte) (interface{}, bool) {
switch c := item[0]; c {
case 'n':
return d.getNewLiteral(), true
case 'u': // undefined
return Undefined{}, true
case 'B': // BinData or Boolean
switch item[1] {
case 'i': // BinData
return d.getBinData(), true
case 'o': // Boolean
return d.getBoolean(), true
}
case 'D': // Date, DBRef, or Dbref
switch item[1] {
case 'a': // Date
return d.getDate(), true
case 'b': // Dbref
return d.getDBRef(), true
case 'B': // DBRef or DBPoiner
switch item[2] {
case 'R': // DBRef
return d.getDBRef(), true
case 'P': // DBPointer
return d.getDBPointer(), true
}
}
case 'M': // MinKey or MaxKey
switch item[1] {
case 'i': // MinKey
return MinKey{}, true
case 'a': // MaxKey
return MaxKey{}, true
}
case 'O': // ObjectId
return d.getObjectId(), true
case 'N': // NumberInt or NumberLong
switch item[6] {
case 'I': // NumberInt
return d.getNumberInt(), true
case 'L': // NumberLong
return d.getNumberLong(), true
}
case 'R': // RegExp constructor
return d.getRegexp(), true
case 'T': // Timestamp
return d.getTimestamp(), true
case 'I': // ISO Date
switch item[1] {
case 'S': // ISODate
return d.getDate(), true
}
case '/': // regular expression literal
op := d.scanWhile(scanSkipSpace)
if op != scanRegexpPattern {
d.error(fmt.Errorf("expected beginning of regular expression pattern"))
}
pattern, options, err := d.regexp()
if err != nil {
d.error(err)
}
return RegExp{pattern, options}, true
}
return nil, false
}
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