Golang and antlr4 -- How do I get a parse tree

[jantypas]

I've been trying to use Antlr4 with Golang. Either with a visitor or listener, I'm looking for an accurate example. In the code for example, I need a parse tree object on the last line (p.Start()) but that doesn't seem to exist.

#package Chicken3000

import (
"busygeeks.com/Chicken3000/Chicken3000Parser"
"github.com/antlr4-go/antlr/v4"
}

func PrepareEntityHandlers() {
}

type Chicken3000Listener struct {
*parser.BaseChicken3000Listener
}

func NewChicken3000Listener() *Chicken3000Listener {
return new(Chicken3000Listener)
}

func (l *Chicken3000Listener) EnterGameQuit(
ctx antlr.ParserRuleContext) {

}

func (l *Chicken3000Listener) ExitGameQuit(ctx *antlr.ParserRuleContext) {

}

func ParseInput(input string) {
var listener Chicken3000Listener
inputStream := antlr.NewInputStream(input)
lexer := parser.NewChicken3000Lexer(inputStream)
stream := antlr.NewCommonTokenStream(lexer, antlr.TokenDefaultChannel)
p := parser.NewChicken3000Parser(stream)
antlr.ParseTreeWalker.Walk(p, listener)
}

[lparkes]

You will need to use listeners AFAICT.

The method name Start() is based on the name of your top level rule.

For the grammar I'm working on right now, the top level rule is called "file" and so ANTLR generates a parser method File() and I run p.File() to get my parse tree.