一个Go写的JSON表达式工具

为了解决用户输入表达式分析数据的功能,我写了一个Go的JSON表达式分析工具,希望对用Golang的同学有用。

https://github.com/elgs/gojq

gojq

JSON query in Golang.

Install

go get -u github.com/elgs/gojq

This library serves two purposes:

• enables JSON expression evaluation
• reduces the pain of type assertion parsing JSON

Query from JSON Object

package main
import (
 "fmt"
 "github.com/elgs/gojq"
)
var jsonObj = `
{
 "name": "sam",
 "gender": "m",
 "pet": null,
 "skills": [
 "Eating",
 "Sleeping",
 "Crawling"
 ]
}
`
func main() {
 parser, err := gojq.NewStringQuery(jsonObj)
 if err != nil {
 fmt.Println(err)
 return
 }
 fmt.Println(parser.Parse("name")) // sam <nil>
 fmt.Println(parser.Parse("gender")) // m <nil>
 fmt.Println(parser.Parse("skills.[1]")) // Sleeping <nil>
 fmt.Println(parser.Parse("hello")) // <nil> hello does not exist.
 fmt.Println(parser.Parse("pet")) // <nil> <nil>
}

Query from JSON Array

package main
import (
 "fmt"
 "github.com/elgs/gojq"
)
var jsonArray = `
[
 {
 "name": "elgs",
 "gender": "m",
 "skills": [
 "Golang",
 "Java",
 "C"
 ]
 },
 {
 "name": "enny",
 "gender": "f",
 "skills": [
 "IC",
 "Electric design",
 "Verification"
 ]
 },
 {
 "name": "sam",
 "gender": "m",
 "pet": null,
 "skills": [
 "Eating",
 "Sleeping",
 "Crawling"
 ]
 }
]
`
func main() {
 parser, err := gojq.NewStringQuery(jsonArray)
 if err != nil {
 fmt.Println(err)
 return
 }
 fmt.Println(parser.Parse("[0].name")) // elgs <nil>
 fmt.Println(parser.Parse("[1].gender")) // f <nil>
 fmt.Println(parser.Parse("[2].skills.[1]")) // Sleeping <nil>
 fmt.Println(parser.Parse("[2].hello")) // <nil> hello does not exist.
 fmt.Println(parser.Parse("[2].pet")) // <nil> <nil>
}

Netsted Query

package main
import (
 "fmt"
 "github.com/elgs/gojq"
)
var jsonArray = `
[
 {
 "name": "elgs",
 "gender": "m",
 "skills": [
 "Golang",
 "Java",
 "C"
 ]
 },
 {
 "name": "enny",
 "gender": "f",
 "skills": [
 "IC",
 "Electric design",
 "Verification"
 ]
 },
 {
 "name": "sam",
 "gender": "m",
 "pet": null,
 "skills": [
 "Eating",
 "Sleeping",
 "Crawling"
 ]
 }
]
`
func main() {
 parser, err := gojq.NewStringQuery(jsonArray)
 if err != nil {
 fmt.Println(err)
 return
 }
 samSkills, err := parser.Parse("[2].skills")
 fmt.Println(samSkills, err) //[Eating Sleeping Crawling] <nil>
 samSkillParser := gojq.NewQuery(samSkills)
 fmt.Println(samSkillParser.Parse("[1]")) //Sleeping <nil>
}