Modifying C# grammar from version for ANTLR3.2 to version for ANTLR4

[Petr Kloza]

Hi all,

I want to use ANTLR4 as a compiler for my project (Generator of Documentation), because it seems to me the best of all compilers I have tested. I want to parse a C# code, but I have not found any grammar for ANTLR4. I do not want to use ANTLR3.2 because it is so laborious to write target code to the grammar for the functionality of my generator and I have also written the Visitor which should make the functionality.

The problem is, that the grammar for ANTLR 3.2 downloaded here: http://antlrcsharp.codeplex.com/ is not compatible with ANTLR4 even when I modified it (I have eliminate syntax errors and warnings). The parser makes error nodes of type Type_declarationContext with NoViableException. I do not know why it want to make everything type_declaration context even if the code does not begin with one of these tokens: class, struct, delegate, enum or interface. Have a look at the picture from debug: In a simple code with one class_declaration, it makes four more Type_declarationContext - which belongs to syntax rule type_declaration, but there should be for example property_declaration inside the class_declaration.

Does anyone know how to update the grammar to be compatible with ANLTR4?

Here You can have a look on my project, where I have done some work on the C# grammar from the codeplex... It is easy to use. I will be so happy if anyone solve the bug and update the C# grammar for ANTLR4.

My project link: http://ulozto.cz/xg8uttEG/argutec-xdoc-zip Password: diplomaproject

Thank You very much!

Petr Kloza

[James Petry]

On Sunday, 4 January 2015 11:59:30 UTC, Petr Kloza wrote:

Does anyone know how to update the grammar to be compatible with ANLTR4?

As a learning exercise I am updating the C# ANTLR 3 grammar from here:

  https://github.com/ChristianWulf/CSharpGrammar

At the moment there are still some semantic predicates in java in the updated grammar.
I am gradually removing them following the advice in the ANTLR 4 book.

Here is my project with a simple refactoring test that I have run successfully on real life C# code:
  https://github.com/gavilancomun/refactor-csharp-java

Best Wishes,
James

[James Petry]

I've completed the rewrite, so the ANTLR 4 grammar is now target language-neutral.

Here is a port of my java code to C#, using the same grammar:

  https://github.com/gavilancomun/refactor-csharp-csharp

Best Wishes,
James

[Terence Parr]

cool. :)  James, can we add this to https://github.com/antlr/grammars-v4 ?  You could fork, then add csharp/CSharp4*.g4 + LICENSE

Ter

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[James Petry]

On Sunday, 29 March 2015 16:29:54 UTC+1, the_antlr_guy wrote:

cool. :)  James, can we add this to https://github.com/antlr/grammars-v4 ?  You could fork, then add csharp/CSharp4*.g4 + LICENSE

Sure. There's a pull request with this now.

Best Wishes,
James

[Terence Parr]

thanks. it’s in now!

T