How to convert Antlr parse tree to JSON

[Gervasius Ishuuwa]

HI Guys,  I am trying to replicate the solution in Golang. I am not getting the nested map as expected, instead I am only getting the head node. Below is my code thus far:

A snapshot of my parse tree and debug output are attached herewith. 

Many thanks:

package main

import (

    "encoding/json"

    "reflect"

    "strconv"

    "strings"

    "time"

    "../parser"

    "./docker"

    "./kubernetes"

    "./orchestrator"

    "./utils"

    "github.com/antlr/antlr4/runtime/Go/antlr"

    "github.com/emirpasic/gods/lists/arraylist"

    "github.com/emirpasic/gods/maps/linkedhashmap"

)

func toMap(tree antlr.Tree) *linkedhashmap.Map {

    m := linkedhashmap.New()

    traverseMap(tree, m)

    return m

}

func traverseMap(tree antlr.Tree, m *linkedhashmap.Map) {

    if (reflect.TypeOf(tree) == reflect.TypeOf(&antlr.TerminalNodeImpl{})) {

        token := tree.(antlr.TerminalNode).GetSymbol()

        m.Put("type", token.GetTokenType())

        m.Put("text", token.GetText())

    } else {

        children := arraylist.New()

        s := reflect.ValueOf(tree).Type().Elem().Name()

        m.Put(s, children)

        for i := 0; i < tree.GetChildCount(); i++ {

            nested := linkedhashmap.New()

            children.Add(nested)

            traverseMap(tree.GetChild(i), nested)

        }

    }

}

func main() {

    input, _ := antlr.NewFileStream("../input/sample-mvbag-rich.toml")

    lexer := parser.NewVeloLexer(input)

    stream := antlr.NewCommonTokenStream(lexer, 0)

    p := parser.NewVeloParser(stream)

    p.RemoveErrorListeners()

    p.AddErrorListener(errorListiner)

    p.BuildParseTrees = true

    tree := p.Velo()

    j := toMap(tree)

    println(j.Size())

    strB, _ := j.ToJSON()

    print(string(strB))

    //antlr.ParseTreeWalkerDefault.Walk(NewVeloListener(), tree)

}

[Gervasius Ishuuwa]

On Thursday, 22 August 2019 15:34:15 UTC+2, Gervasius Ishuuwa wrote:

HI Guys,  I am trying to replicate the solution (

https://stackoverflow.com/questions/49116223/convert-antlr-parse-tree-to-json

) in Golang. I am not getting the nested map as expected, instead I am only getting the head node. Below is my code thus far: