Questions tagged [state-machine]

A state machine is a model for designing systems which change based upon their current state and what input they receive.

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Self Running iterable state machine with Enums in Java

During development I needed to design a state machine with decision which runs to completion and performs state transition without the need to wait for events. So i come up with the following ...
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State Machine with pre-validation

I'm developing a feature that has to execute ordered async task. However it's possible that the system has to rollback to perform ...
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StateMachine Driven Workflow Design Feedback

Hi Im looking for feedback on design of my workflow - using state machine and swift combine. In my opinion, some aspects of the design violate single responsibility principle, cohesion, and overall ...
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Simple State Machine and Transition Table

The goal is to have well defined state transitions, and the ability to provide the next event to execute. I'd like to know if this is a proper implementation of State Machine, considering how states ...
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Finite State Machine

I'm beginner in rust. I would ask code review of my finite state machine. Main feature : static (event, state and transition) support pushdown It is the first step, second step is to use macro ...
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Scalable design of a system with multiple state machines, where valid state transitions depend on the state of other machines

This is a pretty huge question, however, I would appreciate it if you could just review the design and not my implementations of it. The Implementation and test sections could be ignored, they are ...
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Simple Unity program for a research experiment

I'm developing a small C# Unity application to display stereoscopic images as part of a wider research study. Since the experiment consists of unique stages (Start, during a trial, between trials, ...
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Toy Robot Simulator

I know this code worked as I've tested it with the case tests commented below in the code, and even added a few of my own, but the developers who were testing me came back with the following critiques:...
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Finite State Machine / Scene Manager in C

I'm new to C programming but this is my attempt at a Scene/State machine. I haven't had a code review before so I'm guessing this is gonna hurt :D § Preliminary SceneFSM manages Scenes, one Scene "...
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Lock-free state machine

I've written a lock-free state machine in go and I would love to receive some feedback on it. Writing this library my main concerns are keeping it lock-free and very light-weight (no bells and ...
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The parking machine implementation

I am interesting in the topic of finite automata, so I started over by implementing a parking machine from this video: Computers Without Memory - Computerphile to understand conceptions. Didn't do ...
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Hardware Clock Divider

I have created a clock divider that works as follows: If the division factor is 0, pass the clock through unchanged. Otherwise, flip the output clock signal after the specified number of input clock ...
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Simple tokenizer v2 - reading all matching chars at once

I have rewritten my tokenizer according to most of the suggestions from the previous question here. API It now reads all chars as long as they match the pattern. I use three types of attributes to ...
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Simple tokenizer v1 - reading char by char

I was feeling like writing a new Uri parser. The previous one was too limited and wasn't able to parse the authority part. This one is also based on the pretty ...
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A Simplistic Finite State Machine Generator

I have designed a compile time Finite State Machine generator. I have chosen to use some of the features of C++17 such as parameter pack expansion, fold expressions and lambdas to keep the complexity ...
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Extract lines under the specified heading

I wrote the following working code, which I just can't stomach: ...
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State machine translates text into executable python code [v2]

A few days ago I started writing my own compiler-like program which has the goal to compile plain text into executable python code. After I let my first version review here, I made huge changes to the ...
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F# pattern matching to determine the state of a bank account based on past events

I am writing an event sourced system in which I need to have the state based on the events that already occurred for a given bank account. The events are defined such as: ...
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Implementing Hangman using a State Pattern

I decided to implement a Hangman game using an object oriented State Pattern design. This is one of my first actual OOP as I normally write functional code. Code use: ...
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Turing machine schoolwork

Our teacher doesn't give much feedback on our code itself. Was just looking for some feedback on how I could improve on this. This is the method that tests the string against the Turing machine that ...
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Finite state machine for chasing and attacking a target

My questions are: How can I improve my implementation of the FSM model? Should Finite State Machines have functionality for Adding and Removing states from table? (Since I can only be in one state at ...
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Java UIState System

I am trying to come up with a UIState system that works well with Java UI. Before I show it I know I could add enums to help distinguish the states but I've left that out for simplicity. Here is what ...
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Designing yet another a state machine

I wanted to design a state machine with a few goals in mind: Encapsulate state logic within individual classes to keep them decoupled. (I'm very curious what the community thinks about this in ...
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Scheme: FSM substring search

I have been working on a function that return a FSM that searches a specific word based on the argument of the constructor. The idea was to use those routines as means to learn about regular ...
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1answer
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C++ CLI Console Menu Statemachine

I am trying to find the best way(/most efficent way) to setup my console program's menu. The way I have it set up is that I have a Menu class and then I use a menu pointer called currentMenu and I ...
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Finite State Machine in C++

I made a state machine. You can press 0 and 1 to switch between the hypothetical menu and playing state. I hope you can help me improve it further. StateManager.h ...
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static macro-based State Machine implementation

While learning Rust for the past couple of weeks, I set out to use the type-system to build a static State Machine implementation in Rust. The goals: program in idiomatic Rust no runtime overhead ...
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21 Game (Nim) as Finite State Machine in Python

Feedback from previous posts of mine suggested that my approach to states was haphazard, which is not surprising since I hadn't really thought of games in terms of states before. I have since gone off ...
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Finite state automata

This is a non-deterministic finite state automata (NFA) meant to be used with a Regex engine. To show some example usage, suppose you wanted to construct an NFA for the regex ...
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Finite Automata stub in Rust

I wrote a finite automata implementation in C years ago. C's access to mutable, unsafe, raw pointers made it quite simple for me to link/relink the states of a finite automata. I read the official ...
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Finite State Machine to segment Thai syllables

I am developing a FSM to segment Thai syllables with the following rules: Here are my util functions: ...
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Implement a Finite State Machine in ES6 [closed]

I have built a simple finite state machine that models an even simpler fictitious bank account system. Any given account can be in one of three states at any time: Open, Closed, or Held. I have a ...
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Push Down Automaton to detect RNA hairpins

For one of my assignments I am supposed to write a Push Down Automaton. It's supposed to receive a string that has to be checked if it's an RNA Hairpin. For example: gacgcaaguc would be one, since ...
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3 state switch for a table sort

I have a data table with 7 columns. The first column is the index that increases from 1 to N and is considered to be in ascending order by default. The remaining columns are unsorted. I need to be ...
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Knuth Morris Pratt substring search algorithm

Below you can find a Kotlin based implementation of the Knuth-Morris-Pratt substring search algorithm. ...
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1answer
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Python coroutine structure

I've completed Advent of Code's Day 9 in Python3, trying to use it to teach myself coroutines. I'm very familiar with generators, but I've pretty much never used coroutines before. I've ended up with ...
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Simple state machine based command-line argument parser

I'm in the process of learning to write idiomatic JavaScript code so naturally I'm parsing command line arguments. My approach to this is to have a simple state machine. The parser should work as ...
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“Academic interest” implementation of a Finite State Machine

Context I'm playing around the concept of a Finite State Machine. While I understand the basic principles behind it, I want to implement a simple, yet generic class which could be reused in the ...
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DFA creation from string

I have fairly simple Python 3 code that creates a DFA from a string. It works great, but I believe it can be made more efficient. There are a total of 3 loops: First iterates over the string Second ...
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Mars Rover problem in J

I've written an implementation of the "famous" Mars Rover simulation, (another question on this) whose problem statement is this: The first line of input is the upper-right coordinates of ...
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1answer
662 views

Stack-based state machine

Is everything alright with this code? What can I add to it? state.h: ...
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Alternative to nonlocal for local variables in a function with nested functions in Python

Introduction for future readers I posted the code below in the hope that it would be a good example to discuss the topic "Alternative to nonlocal for local variables in a function with nested ...
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Time-dependent state machine with two outputs

Given a class BasicDataFeed whose purpose is to feed questions and answers into an artificial neural network, which is tested in a non-negotiable manner as follows: ...
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Very simple finite state machine

I have beginner knowledge of C++ and using that and some self dummy design I came up with the above implementation. The FiniteStateMachine here first asks for the ...
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1answer
812 views

Tennis-Refactoring-Kata through OOP

I was trying to solve Tennis-Refactoring-Kata. This seems quite hard at startup but, through use os OOP it can be deeply refactoring using just a single if. My ...
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Character-based transitions (part of a lexer)

As part of my prep for the Code Review community-challenge (which looks like it will be Write your own programming language), I've been working on an LL(1) lexer generator in Rust. Yes, lexer ...
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Stateful implementation of TicTacToe

I made a TicTacToe implementation using State pattern in Java. I was wondering if this could ...
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1answer
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Regex to DFA parser in Dart

I've created a Regex to DFA parser, using Thompson's construction algorithm and epsilon-reduction. Here is the code: builtins.dart: ...
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Designing posts: state machine

In the Object-Oriented Design Pattern Implementation chapter of the second edition of The Rust Programming Language, the basic code structure is given and it suggests trying to add features: This ...
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STTCL FSM framework based on the GoF State Pattern, Part III: Policy based design of higher level State Machine constructs

Preface I have decided to let my pet project created some years ago to undergo a code review here. The review will be broken into parts according to meta question Multiple reviews or one big review?...