From eeb4f8a0faf632e60a436002ef4f8df2f0fc3c53 Mon Sep 17 00:00:00 2001
From: CPPAlien <creaspan@gmail.com>
Date: Tue, 22 Jun 2021 16:45:39 +0800
Subject: [PATCH] =?UTF-8?q?fix:=20=E5=9B=9B=E5=88=99=E8=BF=90=E7=AE=97?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 lib/calc.js | 96 ++++++++++++++++++++++++++++-------------------------
 1 file changed, 51 insertions(+), 45 deletions(-)

diff --git a/lib/calc.js b/lib/calc.js
index 88ea3e6..e6788de 100644
--- a/lib/calc.js
+++ b/lib/calc.js
@@ -1,48 +1,54 @@
-module.exports = function (s) {
-  s = s.trim();
-  const stack = new Array();
-  let preSign = '+';
-  let numStr = '';
-  const n = s.length;
-  for (let i = 0; i < n; ++i) {
-    if (s[i] === '.' || (!isNaN(Number(s[i])) && s[i] !== ' ')) {
-      numStr += s[i];
-    } else if (s[i] === '(') {
-      let isClose = 1;
-      let j = i;
-      while (isClose > 0) {
-        j += 1;
-        if (s[j] === '(') isClose += 1;
-        if (s[j] === ')') isClose -= 1;
+/* eslint-disable */
+// 四则运算
+
+!(function () {
+  var calculate = function (s) {
+    s = s.trim();
+    const stack = new Array();
+    let preSign = '+';
+    let numStr = '';
+    const n = s.length;
+    for (let i = 0; i < n; ++i) {
+      if (s[i] === '.' || (!isNaN(Number(s[i])) && s[i] !== ' ')) {
+        numStr += s[i];
+      } else if (s[i] === '(') {
+        let isClose = 1;
+        let j = i;
+        while (isClose > 0) {
+          j += 1;
+          if (s[j] === '(') isClose += 1;
+          if (s[j] === ')') isClose -= 1;
+        }
+        numStr = `${calculate(s.slice(i + 1, j))}`;
+        i = j;
       }
-      numStr = `${calculate(s.slice(i + 1, j))}`;
-      i = j;
-    }
-    if (isNaN(Number(s[i]) && s[i] !== '.') || i === n - 1) {
-      let num = parseFloat(numStr);
-      switch (preSign) {
-        case '+':
-          stack.push(num);
-          break;
-        case '-':
-          stack.push(-num);
-          break;
-        case '*':
-          stack.push(stack.pop() * num);
-          break;
-        case '/':
-          stack.push(stack.pop() / num);
-          break;
-        default:
-          break;
+      if ((isNaN(Number(s[i])) && s[i] !== '.') || i === n - 1) {
+        let num = parseFloat(numStr);
+        switch (preSign) {
+          case '+':
+            stack.push(num);
+            break;
+          case '-':
+            stack.push(-num);
+            break;
+          case '*':
+            stack.push(stack.pop() * num);
+            break;
+          case '/':
+            stack.push(stack.pop() / num);
+            break;
+          default:
+            break;
+        }
+        preSign = s[i];
+        numStr = '';
       }
-      preSign = s[i];
-      numStr = '';
     }
-  }
-  let ans = 0;
-  while (stack.length) {
-    ans += stack.pop();
-  }
-  return ans;
-};
\ No newline at end of file
+    let ans = 0;
+    while (stack.length) {
+      ans += stack.pop();
+    }
+    return ans;
+  };
+  module.exports = calculate;
+})();