validateCoreJar.gradle

//This script checks if there are any dependencies in the core mod to code outside of the
//core mod package and throws an exception if so

buildscript {
	repositories {
		jcenter()
		maven {
			name = "forge"
			url = "http://files.minecraftforge.net/maven"
		}
	}
	dependencies { classpath 'net.minecraftforge.gradle:ForgeGradle:2.3-SNAPSHOT' }
}

apply plugin: 'net.minecraftforge.gradle.forge'

import org.objectweb.asm.ClassReader;
import org.objectweb.asm.Type;
import org.objectweb.asm.commons.ClassRemapper;
import org.objectweb.asm.commons.Remapper;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.FieldVisitor;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;

class ClassValidator extends Remapper {
	String cls;

	@Override
	public String map(final String type) {
		checkClassType(type);
		return super.map(type);
	}

	private void checkClassType(final String type) {
		if(type.startsWith("thebetweenlands") && !type.startsWith("thebetweenlands/core/")) {
			throw new RuntimeException(String.format("Core mod class %s has illegal dependency to %s!", this.cls, type));
		}
	}
}

class CoreModImportsValidationTask extends DefaultTask {
	@TaskAction
	def validate() {
		def coreJarFiles = project.fileTree(project.sourceSets.main.output.classesDir.path).matching { include 'thebetweenlands/core/**' }
		coreJarFiles.visit { FileVisitDetails details ->
			if(details.file.isFile() && details.file.name.endsWith(".class")) {
				validateClassFile(details.file)
			}
		}
	}

	def validateClassFile(File file) {
		file.withInputStream { is ->
			ClassReader classReader = new ClassReader(is);
			final ClassValidator validator = new ClassValidator();
			ClassVisitor visitor = new ClassVisitor(Opcodes.ASM5) {
						@Override
						public void visit(int version, int access, String name, String signature, String superName, String[] interfaces) {
							if(validator.cls == null) {
								validator.cls = name;
							}
							super.visit(version, access, name, signature, superName, interfaces);
						}

						@Override
						public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions) {
							return new MethodVisitor(Opcodes.ASM5) { };
						}

						@Override
						public FieldVisitor visitField(int access, String name, String desc, String signature, Object value) {
							return new FieldVisitor(Opcodes.ASM5) { };
						}
					};
			classReader.accept(new ClassRemapper(visitor, validator), 0);
		}
	}
}

task validateCoreJar(type: CoreModImportsValidationTask) { }