jmatch

The jmatch library is designed to parse and process JSON data in Go.

It provides a Match function that can be invoked with an instance of io.Reader containing JSON data and a match function that implements the Matcher interface.

type Matcher func(path string, token t.Token)

params for match functions are:

• path is a string that is compatible with jq syntax.
• token is a struct in Go that contains the value and type information.

type Token struct {
	_type  tokenType
	Value  string
}

type of the token is a json type and can be queried using the following methods:

• token.IsString()
• token.IsNumber()
• token.IsBoolean()
• token.IsNull()

Usage example:

package main

import (
	"fmt"
	"os"
	"strings"

	"github.com/rodic/jmatch"
)

func matcher(path string, token jmatch.Token) {
	if token.Value == "2" && token.IsNumber() {
		fmt.Println(path)
	}
}

func main() {

	jsonReader := strings.NewReader("{\"a\": {\"b.c\": [\"2\", 2]}}")

	err := jmatch.Match(jsonReader, matcher)

	if err != nil {
		fmt.Fprintln(os.Stderr, err)
		os.Exit(1)
	}

	// Prints [.a."b.c"[1]] only snd elem matches since the first is string
}

TODO

• improve integration tests with invalid inputs
• cmd tool

License

This project is licensed under the MIT license. Please see the LICENSE file for more details.