/
extjson_builder.go
190 lines (151 loc) · 4.59 KB
/
extjson_builder.go
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// Copyright (C) MongoDB, Inc. 2017-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 bson
import (
"errors"
"fmt"
"strconv"
"github.com/buger/jsonparser"
"github.com/mongodb/mongo-go-driver/bson/builder"
)
type docElementParser func([]byte, []byte, jsonparser.ValueType, int) error
type arrayElementParser func([]byte, jsonparser.ValueType, int, error)
// ParseExtJSONObject parses a JSON object string into a *Document.
func ParseExtJSONObject(s string) (*Document, error) {
b := builder.NewDocumentBuilder()
err := parseObjectToBuilder(b, s, nil, true)
if err != nil {
return nil, err
}
buf := make([]byte, b.RequiredBytes())
_, err = b.WriteDocument(buf)
if err != nil {
return nil, err
}
return ReadDocument(buf)
}
// ParseExtJSONArray parses a JSON array string into a *Array.
func ParseExtJSONArray(s string) (*Array, error) {
b, err := parseJSONArrayToBuilder(s, true)
if err != nil {
return nil, err
}
buf := make([]byte, b.RequiredBytes())
if _, err = b.WriteDocument(buf); err != nil {
return nil, err
}
doc, err := ReadDocument(buf)
if err != nil {
return nil, err
}
array := ArrayFromDocument(doc)
return array, nil
}
func getDocElementParser(b *builder.DocumentBuilder, containingKey *string, ext bool) (docElementParser, *parseState) {
var p docElementParser
var s *parseState
if ext {
s = newParseState(b, containingKey)
p = s.parseElement
} else {
p = parseDocElement(b, false)
}
return p, s
}
func parseJSONArrayToBuilder(s string, ext bool) (*builder.ArrayBuilder, error) {
var b builder.ArrayBuilder
_, err := jsonparser.ArrayEach([]byte(s), parseArrayElement(&b, ext))
return &b, err
}
func parseObjectToBuilder(b *builder.DocumentBuilder, s string, containingKey *string, ext bool) error {
p, st := getDocElementParser(b, containingKey, ext)
err := jsonparser.ObjectEach([]byte(s), p)
if err != nil {
return err
}
if st != nil {
switch st.wtype {
case code:
if st.code == nil {
return errors.New("extjson object with $scope must also have $code")
}
if st.scope == nil {
b.Append(builder.C.JavaScriptCode(*containingKey, *st.code))
} else {
scope := make([]byte, st.scope.RequiredBytes())
_, err := st.scope.WriteDocument(scope)
if err != nil {
return fmt.Errorf("unable to write $scope document to bytes: %s", err)
}
b.Append(builder.C.CodeWithScope(*containingKey, *st.code, scope))
}
case dbRef:
if !st.refFound || !st.idFound {
return errors.New("extjson dbRef must have both $ref and $i")
}
fallthrough
case none:
if containingKey == nil {
*b = *st.subdocBuilder
} else {
b.Append(builder.C.SubDocument(*containingKey, st.subdocBuilder))
}
}
}
return nil
}
func parseDocElement(b *builder.DocumentBuilder, ext bool) docElementParser {
return func(key []byte, value []byte, dataType jsonparser.ValueType, offset int) error {
name := string(key)
switch dataType {
case jsonparser.String:
unescaped, err := jsonparser.Unescape(value, nil)
if err != nil {
return fmt.Errorf(`unable to unescape string "%s": %s`, string(value), err)
}
b.Append(builder.C.String(name, string(unescaped)))
case jsonparser.Number:
i, err := jsonparser.ParseInt(value)
if err == nil {
b.Append(builder.C.Int64(name, i))
break
}
f, err := jsonparser.ParseFloat(value)
if err != nil {
return fmt.Errorf("invalid JSON number: %s", string(value))
}
b.Append(builder.C.Double(name, f))
case jsonparser.Object:
err := parseObjectToBuilder(b, string(value), &name, ext)
if err != nil {
return fmt.Errorf("%s: %s", err, string(value))
}
case jsonparser.Array:
array, err := parseJSONArrayToBuilder(string(value), ext)
if err != nil {
return fmt.Errorf("invalid JSON array: %s", string(value))
}
b.Append(builder.C.Array(name, array))
case jsonparser.Boolean:
boolean, err := jsonparser.ParseBoolean(value)
if err != nil {
return fmt.Errorf("invalid JSON boolean: %s", string(value))
}
b.Append(builder.C.Boolean(name, boolean))
case jsonparser.Null:
b.Append(builder.C.Null(name))
}
return nil
}
}
func parseArrayElement(b *builder.ArrayBuilder, ext bool) arrayElementParser {
var index int64
return func(value []byte, dataType jsonparser.ValueType, offset int, _ error) {
name := strconv.FormatInt(index, 10)
index++
_ = parseDocElement(&b.DocumentBuilder, ext)([]byte(name), value, dataType, offset)
}
}