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Add compilers to roadmap #191

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Add compilers to roadmap #191

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Add compilers to roadmap
certik Oct 14, 2022
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Update source/roadmap.md
certik Oct 14, 2022
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Update source/roadmap.md
certik Oct 14, 2022
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Expand Up @@ -147,6 +147,22 @@ Desired features include:

**Expected outcomes:** fpm can generate source code distributions of packages that can be build using CMake and/or Meson.

## Improving Compilers

The aim of this project is to create and maintain an open source Fortran compiler as a community, here is a non-exhaustive list of (independent) features:

* compile all Fortran projects to binaries
* work interactively (Jupyter notebooks)
* in the browser
* works as the foundation for linters, VSCode language integration and documentation generators
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* runs well on modern hardware (CPU, GPU, ...)

There are three open source compilers under development:

* LFortran: https://lfortran.org/
* Flang: https://releases.llvm.org/15.0.0/tools/flang/docs/index.html
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* GFortran: https://gcc.gnu.org/wiki/GFortran

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@gnikit gnikit Oct 14, 2022 •
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I would consider adding the actual projects and deliverables we have in mind for these (at least for LFortran which you control):

https://github.com/fortran-lang/fortran-lang.org/wiki/GSoC-2022-Project-ideas#language-server
https://github.com/fortran-lang/fortran-lang.org/wiki/GSoC-2022-Project-ideas#parser--asr-for-f2py

For the LSP stuff I would add some summaries from the discussion with the vscode-cpptools devs and email conversations. I will dig them up at a later point

Suggested change
### LFortran: Language Server
This project would be used to first serialize the ASR and then use it within a language server.
- Lfortran would need to create a copy of the LSP types, see example in [clangd:Protocol.h](https://github.com/llvm/llvm-project/blob/main/clang-tools-extra/clangd/Protocol.h).
- Use a serialization library like [RapidJSON](https://github.com/Tencent/rapidjson/) to send and receive the LSP requests/responses.
- Use an RPC communication library either in TypeScript or Python to launch an instance of the language server. For example messages received _from C++_ will be `JSON.parse(yourResponse)` into Typescript JSON, and then converted to RPC with the node module `vscode-jsonrpc`. Similarly, requests to C++ will be de-RPC'd and parsed into the server via the IO buffer, in C++ then cast the JSON into LSP types found in Protocol.h
- Add option in [Modern Fortran](https://github.com/fortran-lang/vscode-fortran-support) for VS Code (vscode-fortran-support) to integrate with the LFortran Language Server for easy usage and development, see GitHb issue [vscode-fortran-support/630](https://github.com/fortran-lang/vscode-fortran-support/issues/630)
**Expected outcomes:** LFortran can be used as a Fortran language server that can be used in other software such as source code editors and IDEs.

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@certik wanna have a look and tell me if I forgot something?

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This requires a design discussion.

I would not recommend parsing the f2py output, because it means supporting that syntax, which complicates maintenance. For f2py's application, I think it's better to just parse Fortran itself, and possibly annotate with comments, both of which we can parse.

Also adding ASR nodes must be done carefully. We try avoiding adding nodes which are only used by one tool, as opposed to all of Fortran (or other languages).

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Let me try to write down a roadmap, for the next half a year, which effectively is to compile "fpm".

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We can remove the F2PY section if that makes things simpler and then iterate on the roadmap at a later point. I simply gathered the descriptions of the GSoC projects that had not been completed in 2022

## [Modern Fortran for Visual Studio Code](https://github.com/fortran-lang/vscode-fortran-support)

### Integration with the Fortran Package Manager and CMake
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