What is minimal sample Gradle project for ANTLR4 (with antlr plugin)?

Question

I have created new Gradle project, added

apply plugin: \'antlr\'

and

dependencies {
    antlr \"org.antlr:antlr4:4.5.3\"
         


        

Answer 1

What helped me is two things:

• Add header:@header{ package com.example.something.antlrparser; } to the top of the grammar file.
• Place the grammar file in corresponding folder, i.e. src/main/antlr/com/example/something/antlrparser/grammar.g4

Now when I run the generateGrammarSource gradle task, .java files are generated in /build/generated-src/antlr/main/com/example/something/antlrparser/*.java and they are automatically picked up by IntelliJ as well as compilable by gradle.

The build.gradle file is just:

group 'com.example.something'
version '1.0-SNAPSHOT'

apply plugin: 'java'
apply plugin: 'antlr'
apply plugin: 'idea'

sourceCompatibility = 1.8

repositories {
    mavenCentral()
}

dependencies {
    testCompile group: 'junit', name: 'junit', version: '4.12'
    antlr "org.antlr:antlr4:4.5" // use ANTLR version 4
}