Created
March 31, 2024 20:43
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Parse and store actions for a turing machine with a particular configuration, does not include final state as a part of stored data.
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// ignore: file_names | |
import 'package:flutter/material.dart'; | |
import 'package:turing_machines/exceptions/ActionParserException.dart'; | |
//Represents an Action which can be performed on the tape of a turing machine. | |
class Actions { | |
String symbol; | |
ActionType type; | |
Actions({required this.type, this.symbol = ""}); | |
//Parses a String containing actions, seperated by a ,(comma) | |
static List<Actions> parseActions(String input) { | |
input = input.replaceAll(" ", ""); | |
List<String> tokens = input.split(','); | |
List<Actions> actions = []; | |
for (String token in tokens) { | |
ActionType type; | |
String symbol = ""; | |
if (token == "L") { | |
type = ActionType.L; | |
} else if (token == "R") { | |
type = ActionType.R; | |
} else if (token == "E") { | |
type = ActionType.E; | |
} else if (token[0] == "P" && token.length == 2) { | |
type = ActionType.P; | |
symbol = token[1]; | |
} else { | |
type = ActionType.NONE; | |
throw ActionParserException("$token is not a valid action!"); | |
} | |
Actions object = Actions(type: type, symbol: symbol); | |
actions.add(object); | |
} | |
return actions; | |
} | |
} | |
enum ActionType { | |
P, | |
R, | |
L, | |
E, | |
// ignore: constant_identifier_names | |
NONE; | |
} |
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Tape
,Configuration
andBehaviour
classes are seperate.An object of type
TuringMachine
will contain a HashMap with<key, value>
pairs of<Configuration, Behaviour>
Actions are a property of
Behaviour
, along with final m-config.