Iterate over LSP structure as like CDT AST iteration

[VenoVeno]

I'm using the org.eclipse.cdt.core jar to parse the AST of a source. Sample AST Parser - git

Source:

int num = 10;

AST:

• CPPASTTranslationUnit (Home.cpp:1) ->
  • CPPASTSimpleDeclaration (Home.cpp:1) -> int num = 10;
    • CPPASTSimpleDeclSpecifier (Home.cpp:1) -> int
    • CPPASTDeclarator (Home.cpp:1) -> num = 10
      • CPPASTName (Home.cpp:1) -> num
      • CPPASTEqualsInitializer (Home.cpp:1) -> = 10
        • CPPASTLiteralExpression (Home.cpp:1) -> 10

Like this, can the Eclipse CDT LSP provide a similar kind of structure to iterate over the source with AST or any other structure? Does it currently have support for it? If no, is there any future plans to expose the structure?

Thanks in advance.

[ghentschke]

It's the job of the server to build and parse the AST to provide its services to cdt-lsp as a client. So currently the cdt-lsp has no use case to get and parse the AST. I don't know your use case but can documentSymbols do it for your purpose? Otherwise take a look on the clangd LSP protocol extension for AST: textDocument/ast

[VenoVeno]

What i'm trying to do is finding a better C++ parser. When i provide a int num = 10;. I need the variable name with type, right side constant and an equal assignment between variable and constant. This is just a sample. The same applies for method, method parameter, method call, arguments to method call.

I'm currently using Eclipse CDT Core Parser engine JAR to construct AST from C++ Source. But it has some limitations and as @jonahgraham discussed in this, it doesn't have full support for all C++ versions.

But I assume LSP have support for all versions of C++. Correct me if i'm wrong with the previous one. I just need a standalone parser to parser C++ source to the custom fields as i said before (Variable, Constant, Method, Method call, Parameter, Assignment and so on).

I just want to know, whether this could be achieved with the current cdt lsp, if not is there any plans in future?

[ghentschke]

I just want to know, whether this could be achieved with the current cdt lsp, if not is there any plans in future?

This cannot be achieved with the current cdt-lsp. AFAIK there are not plans on this.

But I assume LSP have support for all versions of C++

LSP is only the protocol. The C/C++ language server must support the standards.

[jonahgraham]

What i'm trying to do is finding a better C++ parser

You can use the clang parser, which is what clangd uses, but it isn't written in Java.

[VenoVeno]

Eclipse CDT C++ source doesn't need a ready to compiled code. But AFAIK, clang doesn't support such feature link. Clang emits AST only on compilable code which requires all headers and macros to be defined.

Clangd required compile_commands.json link.

[VenoVeno]

LSP is only the protocol. The C/C++ language server must support the standards.

Which language server does Eclipse CDT LSP uses?

[jonahgraham]

Any language server, but the focus is on clangd.