LibJS: Add BigInt

Libraries/LibJS/Runtime/BigIntConstructor.cpp

@@ -0,0 +1,86 @@
+/*
+ * Copyright (c) 2020, Linus Groh <mail@linusgroh.de>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <AK/String.h>
+#include <LibCrypto/BigInt/SignedBigInteger.h>
+#include <LibJS/Interpreter.h>
+#include <LibJS/Runtime/BigIntConstructor.h>
+#include <LibJS/Runtime/BigIntObject.h>
+#include <LibJS/Runtime/Error.h>
+#include <LibJS/Runtime/GlobalObject.h>
+
+namespace JS {
+
+BigIntConstructor::BigIntConstructor()
+    : NativeFunction("BigInt", *interpreter().global_object().function_prototype())
+{
+    define_property("prototype", interpreter().global_object().bigint_prototype(), 0);
+    define_property("length", Value(1), Attribute::Configurable);
+
+    u8 attr = Attribute::Writable | Attribute::Configurable;
+    define_native_function("asIntN", as_int_n, 2, attr);
+    define_native_function("asUintN", as_uint_n, 2, attr);
+}
+
+BigIntConstructor::~BigIntConstructor()
+{
+}
+
+Value BigIntConstructor::call(Interpreter& interpreter)
+{
+    auto primitive = interpreter.argument(0).to_primitive(interpreter, Value::PreferredType::Number);
+    if (interpreter.exception())
+        return {};
+    if (primitive.is_number()) {
+        if (!primitive.is_integer()) {
+            interpreter.throw_exception<RangeError>("BigInt argument must be an integer");
+            return {};
+        }
+        return js_bigint(interpreter, Crypto::SignedBigInteger { primitive.as_i32() });
+    }
+    auto* bigint = interpreter.argument(0).to_bigint(interpreter);
+    if (interpreter.exception())
+        return {};
+    return bigint;
+}
+
+Value BigIntConstructor::construct(Interpreter& interpreter)
+{
+    interpreter.throw_exception<TypeError>("BigInt is not a constructor");
+    return {};
+}
+
+Value BigIntConstructor::as_int_n(Interpreter&)
+{
+    TODO();
+}
+
+Value BigIntConstructor::as_uint_n(Interpreter&)
+{
+    TODO();
+}
+
+}