Fermas-VSCode
In-editor code execution & algorithm visualizer. Omniscient AST step interpreter for JS/TS, Python, and Rust running directly in VS Code — zero host toolchains, auto-inferred pointer badges, and live tri-lingual concurrency swimlanes.
Developers learning data structures and concurrency step through code blind: they cannot see scope bindings filling, pointers mutating across heap structures, or the runtime interleaving between call stacks, microtasks, and event loops.
Developers learning data structures and concurrency step through code blind: they cannot see scope bindings filling, pointers mutating across heap structures, or the runtime interleaving between call stacks, microtasks, and event loops. Existing visualizers either require heavyweight host toolchains (Python/Rust compilers) installed locally or only support toy, hardcoded algorithms.
Engineered an in-editor omniscient AST step interpreter: parses and steps through arbitrary JS/TS, Python, and Rust code with zero host toolchains or local runtime compiler installs required.
Implemented auto-inferred heap pointer badges: statically analyzes array index operations in active stack frames to project dynamic colored pointer badges (left, right, i, ptr) directly above indexed heap array cells with read/write glowing.
Built tri-lingual concurrency event-loop swimlanes: models JavaScript eager Promises (call stack → microtask queue priority → macrotask timers), Python cooperative coroutines (asyncio ready queue), and Rust lazy pull-based Future state machines (zero CPU execution until explicitly polled).
Deep native editor integration: built CodeLens triggers (⚡ Run in Fermas), synchronized gutter markers, live recursion call-tree unwinding, and statement-level inlay hints (/* [Tick 3: nums[left]=0, nums[right]=2] */).