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Resolução desafio 10 por Valdinei Junior (#979)
* Resolução desafio 10 por Valdinei Junior * corrigindo mensagem de erro
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const fs = require("fs"); | ||
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function processFile(filename) { | ||
const rulesAndInputFile = fs.readFileSync(filename, "utf8"); | ||
let rulesAndInput = ""; | ||
if ((/(\r)/.test(rulesAndInputFile))) { | ||
rulesAndInput = rulesAndInputFile.split("\r\n"); | ||
} else { | ||
rulesAndInput = rulesAndInputFile.split("\n"); | ||
} | ||
rulesAndInput.pop(); | ||
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for (const line of rulesAndInput) { | ||
const [rulesFilePath, input] = line.split(","); | ||
const rules = filteredRules(rulesFilePath); | ||
turningMachine(rulesFilePath, rules, input); | ||
} | ||
} | ||
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function filteredRules(rulesFileName) { | ||
const fileRules = fs.readFileSync(rulesFileName, "utf-8").split("\n"); | ||
const filteredLines = fileRules | ||
.filter(line => line.trim() !== "" && !line.startsWith(";")) | ||
.map(line => { | ||
const lineWithoutComments = line.split(";")[0].trim(); | ||
const [currentState, currentSymbol, newSymbol, direction, newState] = lineWithoutComments.split(" "); | ||
return { currentState, currentSymbol, newSymbol, direction, newState }; | ||
}); | ||
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return filteredLines; | ||
} | ||
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function turningMachine(rulesFilePath, rules, input) { | ||
const tape = (input.replace(" ", "_").split("")); | ||
let currentState = "0"; | ||
let tapePosition = 0; | ||
while (true) { | ||
const currentSymbol = tape[tapePosition]; | ||
const selectedRule = findRule(currentState, currentSymbol, rules); | ||
const stateAndSymbolCombinationNotFound = selectedRule === null; | ||
if (stateAndSymbolCombinationNotFound) { | ||
console.log(`${rulesFilePath},${input},ERR`); | ||
return; | ||
} | ||
const symbolNeedsToBeReplaced = selectedRule.newSymbol !== "*"; | ||
if (symbolNeedsToBeReplaced) { | ||
tape[tapePosition] = selectedRule.newSymbol; | ||
} | ||
if (selectedRule.newState.startsWith("halt")) { | ||
console.log(`${rulesFilePath},${input},${tape.join("").replace(/_/g, " ").trim()}`); | ||
return; | ||
} | ||
if (selectedRule.direction === "r") { | ||
tapePosition++; | ||
if (tapePosition >= tape.length) { | ||
tape.push("_"); | ||
} | ||
} else if (selectedRule.direction === "l") { | ||
tapePosition--; | ||
if (tapePosition < 0) { | ||
tape.unshift("_"); | ||
tapePosition = 0; | ||
} | ||
} | ||
currentState = selectedRule.newState; | ||
} | ||
} | ||
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function findRule(state, symbol, rules) { | ||
for (let i = 0; i < rules.length; i++) { | ||
if (rules[i].currentState === state && rules[i].currentSymbol === symbol) { | ||
return { ...rules[i] }; | ||
} | ||
} | ||
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for (let i = 0; i < rules.length; i++) { | ||
if ((rules[i].currentState === state || rules[i].currentState === "*") && (rules[i].currentSymbol === symbol || rules[i].currentSymbol === "*")) { | ||
return { ...rules[i] }; | ||
} | ||
} | ||
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return null; | ||
} | ||
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const filename = process.argv[2]; | ||
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if (!filename) { | ||
console.log("Nenhum argumento foi passado."); | ||
console.log("Exemplo de uso: node turing.js datafile"); | ||
process.exit(1); | ||
} | ||
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processFile(filename); |