parser_json_1_lvl.go

package main

import (
    "bytes"
    "fmt"
)

const (
    READ_KEY = 1
    READ_VALUE = -1
)

var (
	dictionary map[string]string
	json string = "{\"name\":\"luiz\",\"age\": \"26\"}"
)

func main() {
    dictionary = make(map[string]string)
    var state int = READ_KEY
	var key string = ""
	for i := 0; i < len(json); i++ {
    	switch json[i] {
    	case '"':
    	    if (state == READ_KEY) {
    	        i, key = getId(json, i+1)
    	    } else {
    	        i, dictionary[key] = getId(json, i+1)
    	        fmt.Println(key + " : " + dictionary[key])
    	    }
    	case ',':
    	    state = READ_KEY
    	case ':':
    		state = READ_VALUE
    	case '}':
    		// exit the parser
    		return
    	default: break
    	}
    }
}

func getId(json string, i int) (newI int, newId string) {
    buff := bytes.NewBufferString(newId)
    for newI = i ; newI < len(json) && json[newI] != '"'; newI++ {
        buff.WriteByte (json[newI])
    }
    newId = buff.String()
    
    return
}