The documentation page is a bit skimpy; when I’ve stripped out my custom Antlr4 build logic, I get errors that make me think that Antlr3 is still not supported.
Typo: I have custom Antlr3 logic;
Here’s the build script which works; trying to cut this down to use the provided Antlr plugin fails.
description = “A DSL for configuring and querying the Novate platform”
project.ext {
antlrSource = “src/main/antlr3”
generatedDir = “$buildDir/generated-sources”
antlrOutput = “$generatedDir/antlr” }
configurations {
antlr3 }
sourceSets.main.java.srcDir antlrOutput
dependencies {
compile project(":logging")
compile “org.antlr:antlr:3.4”
// Note: pom.xml used exclusions to force anltr-runtime:3.3
antlr3 “org.antlr:antlr:3.3” }
task generateGrammarSource(type: JavaExec) {
description “Generates Java sources from Antlr3 grammars.”
inputs.source fileTree(dir: antlrSource, include: “**/*.g”)
outputs.dir file(antlrOutput)
classpath configurations.antlr3
main “org.antlr.Tool”
args “-o”, “${antlrOutput}/com/annadaletech/nexus/core/grammar”
args inputs.sourceFiles
doFirst {
logger.info “Executing Antlr3 grammar generation:\n${commandLine.join(’ ')}”
} }
idea.module {
// Hack the IML so that “build” is not excluded; necessary because several directories under build
// are added as source, resources, or test folders.
iml.whenMerged { module ->
module.excludeFolders.removeAll {
it.canonicalUrl.endsWith “/build”
}
} }
compileJava.dependsOn generateGrammarSource compileClojure.dependsOn compileJava
The ANTLR plugin that ships with Gradle only supports ANTLR 2.
I was hoping that had changed in the interrum!
Could the documentation be a little more clear about this?
I’ve added a clarifying statement.
… you could always invoke an Ant task IMHO 
Well, it didn’t format well, but what I have above works well enough. I suspect if you had dozens of grammar files across multiple modules, you’d want to create something a bit more sophisticated and easily-reused.
You can use HTML ‘code’ tags for code snippets.