I've spent the last few weeks building SFX in Rust. It's a programming language experiment focused on context-oriented programming with some unusual design choices.

Reality check first:

Solo project, 53 commits

1 GitHub star xD

Zero users besides me

No production usage

Documentation is aspirational

Many stdlib modules are minimal stubs

What actually works:

Basic interpreter (tree-walker)

Arbitrary precision decimals (0.1 + 0.2 = 0.3)

1-based indexing (controversial, I know)

Context/Situation system (the main idea)

Some file I/O and basic networking

JIT hooks exist but optimization is minimal

The Context idea (asking for feedback on this):

Instead of checking if (user.isAdmin) everywhere, you define Situation: AdminMode that overrides methods:

  Concept: User
      To GetPermissions:
          Return "read"
  
  Situation: AdminMode
      Adjust User:
          To GetPermissions:
              Return "admin,write,delete"
  
  Story:
      Create User Called Bob
      Switch on AdminMode
      Print Bob.GetPermissions  # Now returns "admin,write,delete"

Objects change behavior based on active situations without mutating state. Is this useful or just overengineered?

What's NOT ready:

Performance is terrible (haven't optimized anything)

Standard lib is mostly TODOs

AI features are vaporware

REPL doesn't exist

No tooling (LSP, debugger, etc.)

Tests exist but coverage is poor

My questions:

Is context-oriented programming solving a real problem or creating busywork?

Should I focus on making it fast OR making the stdlib useful?

Is 1-based indexing a dealbreaker for you?

Would arbitrary precision by default bother you for a general-purpose language?

I'm not trying to replace anything. This is a learning project that got out of hand.

Repo: https://github.com/roriau0422/sfex-lang

Pages: https://roriau0422.github.io/sfex-lang/

Honest feedback wanted - including "this is pointless, stop wasting time."