Update: Cleanup header and members section

grammar/Urn.g4

@@ -5,12 +5,6 @@
  */
 grammar Urn;
 
-@parser::header {
-}
-
-@parser::members {
-}
-
 urn
     : Urn Colon iD Colon sS EOF
     ;

grammar/antlr

@@ -1,54 +0,0 @@
-#!/usr/bin/env bash
-
-image_tag=latest
-
-output_dir=$(pwd)
-lib_dir=$(pwd)
-src_dir=''
-options=''
-
-command -v realpath >/dev/null 2>&1 || realpath() {
-    [[ $1 = /* ]] && echo "$1" || echo "$PWD/${1#./}"
-}
-
-while [[ $# -gt 0 ]]
-do
-key="$1"
-
-case $key in
-    -o)
-        output_dir=$(realpath "$2")
-        shift # past argument
-        ;;
-    -lib)
-        lib_dir=$(realpath "$2")
-        shift # past argument
-        ;;
-    -encoding|-message-format|-package)
-        options="${options} ${1} ${2}"
-        shift # past argument
-        ;;
-    -*)
-        options="${options} ${1}"
-        ;;
-    *)
-        src=$(realpath "$1")
-        ;;
-esac
-shift # past argument or value
-done
-
-src_dir=$(dirname ${src})
-src_file=$(basename ${src})
-
-exec docker run --rm \
-     --net=none \
-     --user $(id -u):$(id -g) \
-     -v ${src_dir}:${src_dir} \
-     -v ${output_dir}:${output_dir} \
-     -v ${lib_dir}:${lib_dir} \
-     leodido/antlr:${image_tag} \
-     -o ${output_dir} \
-     -lib ${lib_dir} \
-     ${options} \
-     ${src_dir}/${src_file}