From ac9de4abfbd1d2fc95713d68440b6d82ceed90ee Mon Sep 17 00:00:00 2001
From: FihFafnir <fihfdragon@gmail.com>
Date: Sat, 5 Apr 2025 15:40:00 -0300
Subject: [PATCH] Criando main

---
 main.ts | 132 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 132 insertions(+)
 create mode 100644 main.ts

diff --git a/main.ts b/main.ts
new file mode 100644
index 0000000..5c2c672
--- /dev/null
+++ b/main.ts
@@ -0,0 +1,132 @@
+function solve(firstNumber: number, secondNumber: number, operator: string): number {
+    const operations: { [index: string]: Function } = {
+        "+": () => firstNumber + secondNumber,
+        "-": () => firstNumber - secondNumber,
+        "*": () => firstNumber * secondNumber,
+        "/": () => firstNumber / secondNumber
+    };
+
+    return operations[operator]();
+}
+
+
+function solveSimplifiedExpr(output: Array<string>, operators: Array<string>): void {
+    const secondNumber = Number(output.pop());
+    const firstNumber = Number(output.pop());
+
+    const operator = operators.pop();
+
+    if (operator == null)
+        throw "Operation Not Supported.";
+
+
+    output.push(solve(firstNumber, secondNumber, operator).toString());
+}
+
+function isDigit(character: string) {
+    return character.charCodeAt(0) >= "0".charCodeAt(0)
+        && character.charCodeAt(0) <= "9".charCodeAt(0);
+}
+
+
+function parseExpression(expression: string) {
+    const operators: Array<string> = ["+", "-", "*", "/"];
+    const expr: Array<string> = [];
+    const parenthesesStack: Array<string> = [];
+
+    let lastToken: string | null = null;
+    let number = "";
+    let hasDecimal = false;
+
+    for (const token of expression.replaceAll(" ", "")) {
+        if (isDigit(token)) {
+            number += token;
+        } else if (token === ".") {
+            if (hasDecimal || !number.length)
+                throw "Número decimal mal formado.";
+            number += token;
+            hasDecimal = true;
+        } else if (token === "(") {
+            parenthesesStack.push(token);
+            expr.push(token);
+            hasDecimal = false;
+        } else if (token === ")") {
+            if (!parenthesesStack.length)
+                throw "Parêntese fechado sem abertura correspondente.";
+            parenthesesStack.pop();
+
+            if (number.length) {
+                expr.push(number);
+                number = "";
+                hasDecimal = false;
+            }
+
+            expr.push(token);
+        } else if (operators.indexOf(token) >= 0) {
+            if (!number.length
+                && token === "-"
+                && (lastToken == null
+                    || operators.indexOf(lastToken) >= 0
+                    || lastToken == "(")) {
+                number += token;
+            } else {
+                if (!number.length)
+                    throw `Operador '${token}' mal posicionado na expressão.`;
+                expr.push(number);
+                number = "";
+                hasDecimal = false;
+                expr.push(token);
+            }
+        } else throw `Caractere inválido na expressão: '${token}'`;
+
+        lastToken = token;
+    }
+
+    if (!number.length && (
+        lastToken == null
+        || operators.indexOf(lastToken) >= 0))
+        throw `Operador '${lastToken}' mal posicionado na expressão.`;
+
+    if (parenthesesStack.length)
+        throw "Parêntese aberto sem fechamento correspondente.";
+
+    if (number.length)
+        expr.push(number);
+
+    return expr;
+}
+
+function solveExpression(expression: string) {
+    const priorities: { [index: string]: number } = {
+        "+": 1,
+        "-": 1,
+        "*": 2,
+        "/": 2
+    };
+
+    const operators: Array<string> = [];
+    const output: Array<string> = [];
+
+    for (const token of parseExpression(expression)) {
+        if (token === "(") {
+            operators.push(token);
+        } else if (token === ")") {
+            while (operators[operators.length - 1] !== "(")
+                solveSimplifiedExpr(output, operators);
+            operators.pop();
+        } else if (priorities.hasOwnProperty(token)) {
+            while (operators.length
+                && operators[operators.length - 1] != "("
+                && priorities[operators[operators.length - 1]] >= priorities[token])
+                solveSimplifiedExpr(output, operators);
+            operators.push(token);
+        } else {
+            output.push(token);
+        }
+    }
+
+    while (operators.length)
+        solveSimplifiedExpr(output, operators);
+
+    return Number(output.pop());
+}