fix check float by input

#31

Author: taisukef

Runtime.js

@@ -1,5 +1,6 @@
 //import { sleep } from "https://js.sabae.cc/sleep.js";
 import { sleep } from "./sleep.js";
+import { checkFloat } from "./checkFloat.js";
 
 const DEFAULT_MAX_LOOP = 1000;
 
@@ -316,9 +317,8 @@ export class Runtime {
     vars.input = async (s) => {
       const toint = (s) => {
         if (s == null) return "";
-        const f = parseFloat(s);
-        if (!isNaN(f) && f.toString() == s) return f;
-        return s;
+        if (!checkFloat(s)) return s;
+        return parseFloat(s);
       };
       if (this.callbackinput) {
         return toint(await this.callbackinput(s));

checkFloat.js

@@ -0,0 +1,4 @@
+export const checkFloat = (s) => {
+  const floatRegex = /^[+-]?(?:\d*\.\d+|\d+\.\d*|\d+)$/;
+  return floatRegex.test(s);
+};

checkFloat.test.js

@@ -0,0 +1,26 @@
+import * as t from "https://deno.land/std/testing/asserts.ts";
+import { checkFloat } from "./checkFloat.js";
+
+const check = (s, b) => {
+  const b2 = checkFloat(s);
+  if (b != b2) console.log(s, "must be", b);
+  t.assertEquals(b, b2);
+}
+
+Deno.test("checkFloat", () => {
+  check(null, false);
+  check(undefined, false);
+  check("9", true);
+  check("0", true);
+  check("9.", true);
+  check("9.a", false);
+  check("a", false);
+  check("0.1", true);
+  check(".1", true);
+  check("-0.1", true);
+  check("+0.1", true);
+  check("+-0.1", false);
+  check(".1000", true);
+  check("a.1000", false);
+  check("1e1", false);
+});