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-rw-r--r--js/src/builtin/Number.js105
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diff --git a/js/src/builtin/Number.js b/js/src/builtin/Number.js
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#if JS_HAS_INTL_API
+var numberFormatCache = new_Record();
+
+/**
+ * Format this Number object into a string, using the locale and formatting options
+ * provided.
+ *
+ * Spec: ECMAScript Language Specification, 5.1 edition, 15.7.4.3.
+ * Spec: ECMAScript Internationalization API Specification, 13.2.1.
+ */
+function Number_toLocaleString() {
+ // Steps 1-2.
+ var x = callFunction(ThisNumberValueForToLocaleString, this);
+
+ // Steps 2-3.
+ var locales = ArgumentsLength() ? GetArgument(0) : undefined;
+ var options = ArgumentsLength() > 1 ? GetArgument(1) : undefined;
+
+ // Step 4.
+ var numberFormat;
+ if (locales === undefined && options === undefined) {
+ // This cache only optimizes for the old ES5 toLocaleString without
+ // locales and options.
+ if (!intl_IsRuntimeDefaultLocale(numberFormatCache.runtimeDefaultLocale)) {
+ numberFormatCache.numberFormat = intl_NumberFormat(locales, options);
+ numberFormatCache.runtimeDefaultLocale = intl_RuntimeDefaultLocale();
+ }
+ numberFormat = numberFormatCache.numberFormat;
+ } else {
+ numberFormat = intl_NumberFormat(locales, options);
+ }
+
+ // Step 5.
+ return intl_FormatNumber(numberFormat, x, /* formatToParts = */ false);
+}
+#endif // JS_HAS_INTL_API
+
+// ES6 draft ES6 20.1.2.4
+function Number_isFinite(num) {
+ if (typeof num !== "number") {
+ return false;
+ }
+ return num - num === 0;
+}
+
+// ES6 draft ES6 20.1.2.2
+function Number_isNaN(num) {
+ if (typeof num !== "number") {
+ return false;
+ }
+ return num !== num;
+}
+
+// ES2021 draft rev 889f2f30cf554b7ed812c0984626db1c8a4997c7
+// 20.1.2.3 Number.isInteger ( number )
+function Number_isInteger(number) {
+ // Step 1. (Inlined call to IsIntegralNumber)
+
+ // 7.2.6 IsIntegralNumber, step 1.
+ if (typeof number !== "number") {
+ return false;
+ }
+
+ var integer = std_Math_trunc(number);
+
+ // 7.2.6 IsIntegralNumber, steps 2-4.
+ // |number - integer| ensures Infinity correctly returns false, because
+ // |Infinity - Infinity| yields NaN.
+ return number - integer === 0;
+}
+
+// ES2021 draft rev 889f2f30cf554b7ed812c0984626db1c8a4997c7
+// 20.1.2.5 Number.isSafeInteger ( number )
+function Number_isSafeInteger(number) {
+ // Step 1. (Inlined call to IsIntegralNumber)
+
+ // 7.2.6 IsIntegralNumber, step 1.
+ if (typeof number !== "number") {
+ return false;
+ }
+
+ var integer = std_Math_trunc(number);
+
+ // 7.2.6 IsIntegralNumber, steps 2-4.
+ // |number - integer| to handle the Infinity case correctly.
+ if (number - integer !== 0) {
+ return false;
+ }
+
+ // Steps 1.a, 2.
+ // prettier-ignore
+ return -((2 ** 53) - 1) <= integer && integer <= (2 ** 53) - 1;
+}
+
+function Global_isNaN(number) {
+ return Number_isNaN(ToNumber(number));
+}
+
+function Global_isFinite(number) {
+ return Number_isFinite(ToNumber(number));
+}