Getting the java8 compiler remember the comments

1 files changed, 89 insertions, 0 deletions

diff --git a/src/utils/lombok/javac/java8/CommentCollectingScannerFactory.java b/src/utils/lombok/javac/java8/CommentCollectingScannerFactory.java
new file mode 100644
index 00000000..fa79ff67
--- /dev/null
+++ b/src/utils/lombok/javac/java8/CommentCollectingScannerFactory.java
@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) 2011-2013 The Project Lombok Authors.
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package lombok.javac.java8;
+
+import java.nio.CharBuffer;
+
+import com.sun.tools.javac.parser.Scanner;
+import com.sun.tools.javac.parser.ScannerFactory;
+import com.sun.tools.javac.util.Context;
+
+public class CommentCollectingScannerFactory extends ScannerFactory {
+	
+	@SuppressWarnings("all")
+	public static void preRegister(final Context context) {
+		if (context.get(scannerFactoryKey) == null) {
+			// Careful! There is voodoo magic here!
+			//
+			// Context.Factory is parameterized. make() is for javac6 and below; make(Context) is for javac7 and up.
+			// this anonymous inner class definition is intentionally 'raw' - the return type of both 'make' methods is 'T',
+			// which means the compiler will only generate the correct "real" override method (with returntype Object, which is
+			// the lower bound for T, as a synthetic accessor for the make with returntype ScannerFactory) for that make method which
+			// is actually on the classpath (either make() for javac6-, or make(Context) for javac7+).
+			//
+			// We normally solve this issue via src/stubs, with BOTH make methods listed, but for some reason the presence of a stubbed out
+			// Context (or even a complete copy, it doesn't matter) results in a really strange eclipse bug, where any mention of any kind
+			// of com.sun.tools.javac.tree.TreeMaker in a source file disables ALL usage of 'go to declaration' and auto-complete in the entire
+			// source file.
+			//
+			// Thus, in short:
+			// * Do NOT parameterize the anonymous inner class literal.
+			// * Leave the return types as 'j.l.Object'.
+			// * Leave both make methods intact; deleting one has no effect on javac6- / javac7+, but breaks the other. Hard to test for.
+			// * Do not stub com.sun.tools.javac.util.Context or any of its inner types, like Factory.
+			@SuppressWarnings("all")
+			class MyFactory implements Context.Factory {
+				// This overrides the javac6- version of make.
+				public Object make() {
+					return new CommentCollectingScannerFactory(context);
+				}
+				
+				// This overrides the javac7+ version.
+				public Object make(Context c) {
+					return new CommentCollectingScannerFactory(c);
+				}
+			}
+			@SuppressWarnings("unchecked") Context.Factory<ScannerFactory> factory = new MyFactory();
+			context.put(scannerFactoryKey, factory);
+		}
+	}
+	
+	/** Create a new scanner factory. */
+	protected CommentCollectingScannerFactory(Context context) {
+		super(context);
+	}
+	
+	@Override
+	public Scanner newScanner(CharSequence input, boolean keepDocComments) {
+		if (input instanceof CharBuffer) {
+			CharBuffer buf = (CharBuffer) input;
+			return new CommentCollectingScanner(this, new CommentCollectingTokenizer(this, buf));
+		}
+		char[] array = input.toString().toCharArray();
+		return newScanner(array, array.length, keepDocComments);
+	}
+	
+	@Override
+	public Scanner newScanner(char[] input, int inputLength, boolean keepDocComments) {
+		return new CommentCollectingScanner(this, new CommentCollectingTokenizer(this, input, inputLength));
+	}
+}