1 files changed, 104 insertions, 0 deletions
diff --git a/src_eclipseagent/lombok/eclipse/agent/EclipseParserPatcher.java b/src_eclipseagent/lombok/eclipse/agent/EclipseParserPatcher.java
new file mode 100644
index 00000000..8ef90dee
--- /dev/null
+++ b/src_eclipseagent/lombok/eclipse/agent/EclipseParserPatcher.java
@@ -0,0 +1,104 @@
+package lombok.eclipse.agent;
+
+import java.io.File;
+import java.io.IOException;
+import java.lang.instrument.ClassFileTransformer;
+import java.lang.instrument.IllegalClassFormatException;
+import java.lang.instrument.Instrumentation;
+import java.lang.instrument.UnmodifiableClassException;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.Method;
+import java.net.URI;
+import java.security.ProtectionDomain;
+import java.util.jar.JarFile;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public class EclipseParserPatcher {
+	private EclipseParserPatcher() {}
+	
+	private static class Patcher implements ClassFileTransformer {
+		@Override public byte[] transform(ClassLoader loader, String className,
+				Class<?> classBeingRedefined,
+				ProtectionDomain protectionDomain, byte[] classfileBuffer)
+				throws IllegalClassFormatException {
+			
+			if ( ECLIPSE_PARSER_CLASS_NAME.equals(className) ) {
+				try {
+					return runTransform("lombok.agent.eclipse.EclipseParserTransformer", classfileBuffer);
+				} catch ( Throwable t ) {
+					System.err.println("Wasn't able to patch eclipse's Parser class:");
+					t.printStackTrace();
+				}
+			}
+			
+			if ( ECLIPSE_CUD_CLASS_NAME.equals(className) ) {
+				try {
+					return runTransform("lombok.agent.eclipse.EclipseCUDTransformer", classfileBuffer);
+				} catch ( Throwable t ) {
+					System.err.println("Wasn't able to patch eclipse's CompilationUnitDeclaration class:");
+					t.printStackTrace();
+				}
+			}
+			
+			return null;
+		}
+	}
+	
+	private static byte[] runTransform(String className, byte[] classfileBuffer) throws Exception {
+		Class<?> transformerClass = Class.forName(className);
+		Constructor<?> constructor = transformerClass.getDeclaredConstructor();
+		constructor.setAccessible(true);
+		Object instance = constructor.newInstance();
+		Method m = transformerClass.getDeclaredMethod("transform", byte[].class);
+		m.setAccessible(true);
+		return (byte[])m.invoke(instance, classfileBuffer);
+	}
+	
+	static final String ECLIPSE_CUD_CLASS_NAME = "org/eclipse/jdt/internal/compiler/ast/CompilationUnitDeclaration";
+	static final String ECLIPSE_PARSER_CLASS_NAME = "org/eclipse/jdt/internal/compiler/parser/Parser";
+	
+	public static void agentmain(String agentArgs, Instrumentation instrumentation) throws Exception {
+		registerPatcher(instrumentation, true);
+		addLombokToSearchPaths(instrumentation);
+	}
+	
+	private static void addLombokToSearchPaths(Instrumentation instrumentation) throws Exception {
+		String path = findPathOfOurClassloader();
+		instrumentation.appendToSystemClassLoaderSearch(new JarFile(path + "/lombok.jar"));
+		instrumentation.appendToBootstrapClassLoaderSearch(new JarFile(path + "/lombok.eclipse.agent.jar"));
+		
+	}
+	
+	private static String findPathOfOurClassloader() throws Exception {
+		ClassLoader loader = EclipseParserPatcher.class.getClassLoader();
+		if ( loader == null ) loader = ClassLoader.getSystemClassLoader();
+		
+		URI uri = loader.getResource(EclipseParserPatcher.class.getName().replace('.', '/') + ".class").toURI();
+		Pattern p = Pattern.compile("^jar:file:([^\\!]+)\\!.*\\.class$");
+		Matcher m = p.matcher(uri.toString());
+		if ( !m.matches() ) return ".";
+		return new File(m.group(1)).getParent();
+	}
+	
+	public static void premain(String agentArgs, Instrumentation instrumentation) throws Exception {
+		registerPatcher(instrumentation, false);
+		addLombokToSearchPaths(instrumentation);
+	}
+	
+	private static void registerPatcher(Instrumentation instrumentation, boolean transformExisting) throws IOException {
+		instrumentation.addTransformer(new Patcher(), true);
+		
+		if ( transformExisting ) for ( Class<?> c : instrumentation.getAllLoadedClasses() ) {
+			if ( c.getName().equals(ECLIPSE_PARSER_CLASS_NAME) ) {
+				try {
+					instrumentation.retransformClasses(c);
+				} catch ( UnmodifiableClassException ex ) {
+					throw new UnsupportedOperationException(
+							"The eclipse parser class is already loaded and cannot be modified. " +
+							"You'll have to restart eclipse in order to use Lombok in eclipse.");
+				}
+			}
+		}
+	}
+}