build.gradle

plugins {
    id 'java'
    id 'antlr'
    id 'idea'
}

group 'org.antlr.study'
version '1.0-SNAPSHOT'

repositories {
    mavenCentral()
}

dependencies {
    antlr "org.antlr:antlr4:4.8"
    implementation "org.antlr:antlr4-runtime:4.8-1"
    implementation 'org.apache.logging.log4j:log4j-slf4j-impl:2.13.3'
    testImplementation group: 'junit', name: 'junit', version: '4.12'
}

generateGrammarSource {
    maxHeapSize = "64m"
    arguments += ["-visitor",
                  "-long-messages",
                  "-package", "org.antlr.study.generated"
    ]

    doLast {
        println "Copying generated grammar lexer/parser files to main directory."
        copy {
            from "${buildDir}/generated-src/antlr/main"
            into "src/main/java/org/antlr/study/generated"
        }
        println "Deleting generated grammar lexer/parser files."
        delete "${buildDir}/generated-src/"
    }
}

clean.doLast {
    file('generated-src').deleteDir()
}