build.gradle

plugins {
    id 'antlr'
}

repositories {
    mavenCentral()
}

dependencies {
    antlr "org.antlr:antlr4:4.13.2"
}
// grammars to include for checking
ext {
    grammars = [
    "FattyAcids.g4",
    "GoslinFragments.g4",
    "Goslin.g4",
    "HMDB.g4",
    "LipidMaps.g4",
    "Shorthand2020.g4",
    "SumFormula.g4",
    "SwissLipids.g4",
//    "Systematic.g4"
    ]
}

grammars.each {
    def grammar = [it]
    println "Checking '$it' with Antlr"
    def taskName = "antlr-${it}"
    def outputDir = "${project.buildDir}/generated-src/antlr/${it}" as File
    def sourceDirectorySet = getObjects().sourceDirectorySet(it,it)
    sourceDirectorySet.srcDir(".")
    sourceDirectorySet.include(it)
    outputDir.mkdirs()
    tasks.create(name: taskName, type: AntlrTask) {
        source = sourceDirectorySet
        outputDirectory = outputDir
        maxHeapSize = '1G'
        arguments = []
    }
    tasks.named('compileJava') { dependsOn(taskName) }
}