Polystate: Composable Finite State Machines
10 months ago
- #zig
- #type-safety
- #finite-state-machines
- Polystate is a library for composable finite state machines (FSMs) in Zig.
- Key features include type-level state tracking, composability, and automatic state diagram generation.
- The library encourages defining program behavior through compositional declarations.
- Simple states can be combined to build complex state machines, enabling semantic-level code reuse.
- Polystate follows several programming conventions for handler functions and message generation.
- The library demonstrates its power through examples like user confirmation dialogs and ATM PIN checks.
- Generic states like 'select', 'inside', and 'hover' enable reusable UI interaction patterns.
- Complex behaviors like two-stage selection can be expressed concisely through state composition.
- The entire implementation is contained in about 130 lines of code, showcasing its efficiency.