113 lines
4.6 KiB
JavaScript
113 lines
4.6 KiB
JavaScript
window.addEventListener("load", () => main());
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const main = () => {
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let def = {
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a: true,
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b: false,
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c: 5
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};
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let exemple = "a && b || c"
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console.log("with", def, "parsing logical expression of \"" + exemple + "\"");
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console.log("result : " + parseLogicalExpression(def, exemple));
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console.log("\n\n-----\n\n ");
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console.log(parseLogicalExpression(def, "!a && b || c && a || c && b && a"));
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console.log("vrai rep d'apres JS:", !true && false || 5 && true || 5 && false && true);
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console.log("\n\n-----\n\n ");
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console.log(parseLogicalExpression(def, "a || b || a && b && c || c"));
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console.log("vrai rep d'apres JS:", true || false || true && false && 5 || 5);
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console.log("\n\n-----\n\n ");
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console.log(parseLogicalExpression(def, "a || a && !a && !b || !a"));
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console.log("vrai rep d'apres JS:", true || true && !true && !false || !true);
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console.log("\n\n-----\n\n ");
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console.log(parseLogicalExpression(def, "(a || b) || (a && b) && c"));
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console.log("vrai rep d'apres JS:", true || false || true && false && 5 || 5);
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};
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const parseLogicalExpression = (subject = Object, expression = String) => {
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// on ajoute les portes non au subject
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Object.keys(subject).forEach(key => {
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subject["!" + key] = !subject[key];
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});
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/* ----------------------------------------------------------------------
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Explication regex pour pas oublier
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( ... ) -> groupe
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| -> séparé les morceaux qu'on recherche
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[^)] -> récupérer le contenu entre ce qu'on a spécifié, ici ( et )
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+ -> au moins un élément
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---------------------------------------------------------------------- */
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const splitter = (expression = String) => expression.split(/(&&|\|\||\([^)]+\))/).map(str => str.trim());
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const replaceWithRightValues = (subject = Object, tableau = Array) => {
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let i = 0;
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tableau.forEach(expression => {
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Object.keys(subject).forEach(key => {
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if(key == expression) tableau[i] = subject[key];
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});
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i++;
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});
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}
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const gate = (gate = String, array = Array) => {
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let posGate = array.findIndex(element => typeof element == "string")
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if(array[posGate] == gate) {
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// console.log("je vais travailler avec la porte", gate, "sur", array);
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// console.log("je fais,", array[posGate - 1], gate, array[posGate + 1])
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if(gate == "&&") array[posGate + 1] = array[posGate - 1] && array[posGate + 1];
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else if(gate == "||") array[posGate + 1] = array[posGate - 1] || array[posGate + 1];
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else return console.error("bad gate type");
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// console.log("res:", array[posGate + 1]);
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array.splice(posGate - 1, 2);
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// console.log("finit:", array);
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} // else console.warn("la porte", gate, "n'a pas la priorité de calcule", array);
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// console.log("\n ");
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return array;
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};
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const resolution = (problem = Array) => {
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while(problem.length > 1) ["&&", "||"].forEach(element => problem = gate(element, problem));
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};
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// expression propre
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let arrayLogicalExpression = splitter(expression);
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console.log(arrayLogicalExpression);
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// on remplace par les valeurs de subject
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replaceWithRightValues(subject, arrayLogicalExpression);
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// on supprime les parenthèses
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// -> on retire les string vide
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arrayLogicalExpression = arrayLogicalExpression.filter(element => element != "");
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// on calcule les parenthèses
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let calculatedBrackets = [] // inialisation du tableau qui va recevoir les réponses des parenthese
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arrayLogicalExpression.forEach(element => {
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if(typeof element == "string") { // ajout de tous les éléments sauf les parentheses
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if(element.startsWith("(") == 0 && element.endsWith(")") == 0) calculatedBrackets.push(element);
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} else calculatedBrackets.push(element)
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if(typeof element == "string") if(element.startsWith("(") && element.endsWith(")")) {
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element = splitter(element.replace("(", "").replace(")", ""));
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replaceWithRightValues(subject, element);
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resolution(element);
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calculatedBrackets.push(element[0]) // ajout des réponses aux parenthèses
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};
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});
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arrayLogicalExpression = calculatedBrackets;
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// on résoud les problemes
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resolution(arrayLogicalExpression);
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console.log(arrayLogicalExpression);
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return arrayLogicalExpression[0];
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};
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