1 files changed, 105 insertions, 0 deletions
diff --git a/js/src/builtin/Number.js b/js/src/builtin/Number.js
new file mode 100644
index 0000000000..2291033286
--- /dev/null
+++ b/js/src/builtin/Number.js
@@ -0,0 +1,105 @@
+/* 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));
+}