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    <p>I don't know if the COTS Java compiler will cooperate with you attempting to extend its syntax. And I don't think it will regenerate source code, but then you may not care if you only want to compile programs after expanding your macros.</p> <p>If you want to extend the grammar, you probably as a minimum to to get a parser generator, the grammer for Java, and start hacking away. <a href="http://www.antlr.org" rel="nofollow">ANTLR</a> would do, and I believe it has a Java grammar available. You'll need to build a prettyprinter to regenerate macro-resolved code to feed to a compiler; I don't think ANTLR offers this off the shelf.</p> <p>As a practical matter, I suspect you will want symbol table information that the hygenic macros can inspect and adjust as they expand. In that case, you might get an open source Java compiler (<a href="http://jikes.sourceforge.net" rel="nofollow">Jikes</a>) and hack that up. It may be the case that such open source compilers are not up to the latest Java standards.</p> <p>If want something reasonably up to date, that parses Java, will let you hack at the grammar, and has full symbol table support, you might consider our <a href="http://www.semanticdesigns.com/Products/DMS/DMSToolkit.html" rel="nofollow">DMS Software Reengineering Toolkit</a> and its <a href="http://www.semanticdesigns.com/Products/FrontEnds/JavaFrontEnd.html" rel="nofollow">Java Front End</a>. DMS provides parsing, tree building, symbol table construction, procedural access/modification to the AST, prettyprinting to regenerate source, and source-to-source transformations for what grammar you define to DMS (including your hygenic macros, if you add their syntax to the Java grammar).</p>
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    1. POWhat is the easiest way to extend Java syntax (hygienic macros)
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    1. COI think openjdk is now the official java 7 reference implementation so yes, I could hack that but I'm trying to found even easier way (if it exists) or more portable solution. I'll check DMS, thanks for the pointer.
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    2. COMikkom: Does openJDK give you the compiler sources? If so, that's an answer.
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    3. COYes, OpenJDK is GPL. I was going to comment on "…open source compilers not up to the latest Java standards…" … I'm actually not aware of any closed-source Java compilers that are (although I haven't gone looking).
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