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ladybird/Userland/Libraries/LibJS/Runtime/GlobalObject.cpp
Linus Groh cbbf4abb0d LibJS: Add a way to get from a GlobalObject to its associated Realm 
This is just another workaround, but it should be much more reliable
than Interpreter::realm(), especially when allocating NativeFunctions
and ECMAScriptFunctionObjects: we're guaranteed to have a GlobalObject
at that point, and it likely was set as the GlobalObject of a Realm and
can lead us back to it. We're however not guaranteed that the VM can
give us an Interpreter, which is why functions in LibWeb can be a bit
crashy at the moment.

We use a WeakPtr<Realm> to properly handle the unlikely case where the
Realm goes away after associating a GlobalObject to it.

We'll always need _something_ of this sort if we want to support
OrdinaryFunctionCreate and CreateBuiltinFunction without the explicit
realm argument while no JS is running, because they want to use the
current Realm Record (always in the first and as fallback in the second
case).
2021-10-14 23:02:19 +01:00

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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2020-2021, Linus Groh <linusg@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/CharacterTypes.h>
#include <AK/Hex.h>
#include <AK/Platform.h>
#include <AK/Utf8View.h>
#include <LibJS/Console.h>
#include <LibJS/Heap/DeferGC.h>
#include <LibJS/Interpreter.h>
#include <LibJS/Runtime/AbstractOperations.h>
#include <LibJS/Runtime/AggregateErrorConstructor.h>
#include <LibJS/Runtime/AggregateErrorPrototype.h>
#include <LibJS/Runtime/ArrayBufferConstructor.h>
#include <LibJS/Runtime/ArrayBufferPrototype.h>
#include <LibJS/Runtime/ArrayConstructor.h>
#include <LibJS/Runtime/ArrayIteratorPrototype.h>
#include <LibJS/Runtime/ArrayPrototype.h>
#include <LibJS/Runtime/AtomicsObject.h>
#include <LibJS/Runtime/BigIntConstructor.h>
#include <LibJS/Runtime/BigIntPrototype.h>
#include <LibJS/Runtime/BooleanConstructor.h>
#include <LibJS/Runtime/BooleanPrototype.h>
#include <LibJS/Runtime/ConsoleObject.h>
#include <LibJS/Runtime/DataViewConstructor.h>
#include <LibJS/Runtime/DataViewPrototype.h>
#include <LibJS/Runtime/DateConstructor.h>
#include <LibJS/Runtime/DatePrototype.h>
#include <LibJS/Runtime/ErrorConstructor.h>
#include <LibJS/Runtime/ErrorPrototype.h>
#include <LibJS/Runtime/FinalizationRegistryConstructor.h>
#include <LibJS/Runtime/FinalizationRegistryPrototype.h>
#include <LibJS/Runtime/FunctionConstructor.h>
#include <LibJS/Runtime/FunctionPrototype.h>
#include <LibJS/Runtime/GeneratorFunctionConstructor.h>
#include <LibJS/Runtime/GeneratorFunctionPrototype.h>
#include <LibJS/Runtime/GeneratorObjectPrototype.h>
#include <LibJS/Runtime/GlobalEnvironment.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/Intl/DisplayNamesConstructor.h>
#include <LibJS/Runtime/Intl/DisplayNamesPrototype.h>
#include <LibJS/Runtime/Intl/Intl.h>
#include <LibJS/Runtime/Intl/ListFormatConstructor.h>
#include <LibJS/Runtime/Intl/ListFormatPrototype.h>
#include <LibJS/Runtime/Intl/LocaleConstructor.h>
#include <LibJS/Runtime/Intl/LocalePrototype.h>
#include <LibJS/Runtime/Intl/NumberFormatConstructor.h>
#include <LibJS/Runtime/Intl/NumberFormatPrototype.h>
#include <LibJS/Runtime/IteratorPrototype.h>
#include <LibJS/Runtime/JSONObject.h>
#include <LibJS/Runtime/MapConstructor.h>
#include <LibJS/Runtime/MapIteratorPrototype.h>
#include <LibJS/Runtime/MapPrototype.h>
#include <LibJS/Runtime/MathObject.h>
#include <LibJS/Runtime/NativeFunction.h>
#include <LibJS/Runtime/NumberConstructor.h>
#include <LibJS/Runtime/NumberPrototype.h>
#include <LibJS/Runtime/Object.h>
#include <LibJS/Runtime/ObjectConstructor.h>
#include <LibJS/Runtime/ObjectPrototype.h>
#include <LibJS/Runtime/PromiseConstructor.h>
#include <LibJS/Runtime/PromisePrototype.h>
#include <LibJS/Runtime/ProxyConstructor.h>
#include <LibJS/Runtime/Realm.h>
#include <LibJS/Runtime/ReflectObject.h>
#include <LibJS/Runtime/RegExpConstructor.h>
#include <LibJS/Runtime/RegExpPrototype.h>
#include <LibJS/Runtime/RegExpStringIteratorPrototype.h>
#include <LibJS/Runtime/SetConstructor.h>
#include <LibJS/Runtime/SetIteratorPrototype.h>
#include <LibJS/Runtime/SetPrototype.h>
#include <LibJS/Runtime/ShadowRealmConstructor.h>
#include <LibJS/Runtime/ShadowRealmPrototype.h>
#include <LibJS/Runtime/Shape.h>
#include <LibJS/Runtime/StringConstructor.h>
#include <LibJS/Runtime/StringIteratorPrototype.h>
#include <LibJS/Runtime/StringPrototype.h>
#include <LibJS/Runtime/SymbolConstructor.h>
#include <LibJS/Runtime/SymbolPrototype.h>
#include <LibJS/Runtime/Temporal/CalendarConstructor.h>
#include <LibJS/Runtime/Temporal/CalendarPrototype.h>
#include <LibJS/Runtime/Temporal/DurationConstructor.h>
#include <LibJS/Runtime/Temporal/DurationPrototype.h>
#include <LibJS/Runtime/Temporal/InstantConstructor.h>
#include <LibJS/Runtime/Temporal/InstantPrototype.h>
#include <LibJS/Runtime/Temporal/PlainDateConstructor.h>
#include <LibJS/Runtime/Temporal/PlainDatePrototype.h>
#include <LibJS/Runtime/Temporal/PlainDateTimeConstructor.h>
#include <LibJS/Runtime/Temporal/PlainDateTimePrototype.h>
#include <LibJS/Runtime/Temporal/PlainMonthDayConstructor.h>
#include <LibJS/Runtime/Temporal/PlainMonthDayPrototype.h>
#include <LibJS/Runtime/Temporal/PlainTimeConstructor.h>
#include <LibJS/Runtime/Temporal/PlainTimePrototype.h>
#include <LibJS/Runtime/Temporal/PlainYearMonthConstructor.h>
#include <LibJS/Runtime/Temporal/PlainYearMonthPrototype.h>
#include <LibJS/Runtime/Temporal/Temporal.h>
#include <LibJS/Runtime/Temporal/TimeZoneConstructor.h>
#include <LibJS/Runtime/Temporal/TimeZonePrototype.h>
#include <LibJS/Runtime/Temporal/ZonedDateTimeConstructor.h>
#include <LibJS/Runtime/Temporal/ZonedDateTimePrototype.h>
#include <LibJS/Runtime/TypedArray.h>
#include <LibJS/Runtime/TypedArrayConstructor.h>
#include <LibJS/Runtime/TypedArrayPrototype.h>
#include <LibJS/Runtime/Value.h>
#include <LibJS/Runtime/WeakMapConstructor.h>
#include <LibJS/Runtime/WeakMapPrototype.h>
#include <LibJS/Runtime/WeakRefConstructor.h>
#include <LibJS/Runtime/WeakRefPrototype.h>
#include <LibJS/Runtime/WeakSetConstructor.h>
#include <LibJS/Runtime/WeakSetPrototype.h>
namespace JS {
GlobalObject::GlobalObject()
: Object(GlobalObjectTag::Tag)
, m_console(make<Console>(*this))
{
}
void GlobalObject::initialize_global_object()
{
auto& vm = this->vm();
ensure_shape_is_unique();
// These are done first since other prototypes depend on their presence.
m_empty_object_shape = heap().allocate_without_global_object<Shape>(*this);
m_object_prototype = heap().allocate_without_global_object<ObjectPrototype>(*this);
m_function_prototype = heap().allocate_without_global_object<FunctionPrototype>(*this);
m_new_object_shape = vm.heap().allocate_without_global_object<Shape>(*this);
m_new_object_shape->set_prototype_without_transition(m_object_prototype);
m_new_ordinary_function_prototype_object_shape = vm.heap().allocate_without_global_object<Shape>(*this);
m_new_ordinary_function_prototype_object_shape->set_prototype_without_transition(m_object_prototype);
m_new_ordinary_function_prototype_object_shape->add_property_without_transition(vm.names.constructor, Attribute::Writable | Attribute::Configurable);
// Normally Heap::allocate() takes care of this, but these are allocated via allocate_without_global_object().
static_cast<FunctionPrototype*>(m_function_prototype)->initialize(*this);
static_cast<ObjectPrototype*>(m_object_prototype)->initialize(*this);
Object::set_prototype(m_object_prototype);
// This must be initialized before allocating AggregateErrorPrototype, which uses ErrorPrototype as its prototype.
m_error_prototype = heap().allocate<ErrorPrototype>(*this, *this);
#define __JS_ENUMERATE(ClassName, snake_name) \
if (!m_##snake_name##_prototype) \
m_##snake_name##_prototype = heap().allocate<ClassName##Prototype>(*this, *this);
JS_ENUMERATE_ITERATOR_PROTOTYPES
#undef __JS_ENUMERATE
// %GeneratorFunction.prototype.prototype% must be initialized separately as it has no
// companion constructor
m_generator_object_prototype = heap().allocate<GeneratorObjectPrototype>(*this, *this);
m_generator_object_prototype->define_direct_property(vm.names.constructor, m_generator_function_constructor, Attribute::Configurable);
#define __JS_ENUMERATE(ClassName, snake_name, PrototypeName, ConstructorName, ArrayType) \
if (!m_##snake_name##_prototype) \
m_##snake_name##_prototype = heap().allocate<PrototypeName>(*this, *this);
JS_ENUMERATE_BUILTIN_TYPES
#undef __JS_ENUMERATE
#define __JS_ENUMERATE(ClassName, snake_name, PrototypeName, ConstructorName) \
if (!m_intl_##snake_name##_prototype) \
m_intl_##snake_name##_prototype = heap().allocate<Intl::PrototypeName>(*this, *this);
JS_ENUMERATE_INTL_OBJECTS
#undef __JS_ENUMERATE
// Must be allocated before `Intl::Intl` below.
#define __JS_ENUMERATE(ClassName, snake_name, PrototypeName, ConstructorName) \
initialize_constructor(vm.names.ClassName, m_intl_##snake_name##_constructor, m_intl_##snake_name##_prototype);
JS_ENUMERATE_INTL_OBJECTS
#undef __JS_ENUMERATE
#define __JS_ENUMERATE(ClassName, snake_name, PrototypeName, ConstructorName) \
if (!m_temporal_##snake_name##_prototype) \
m_temporal_##snake_name##_prototype = heap().allocate<Temporal::PrototypeName>(*this, *this);
JS_ENUMERATE_TEMPORAL_OBJECTS
#undef __JS_ENUMERATE
// Must be allocated before `Temporal::Temporal` below.
#define __JS_ENUMERATE(ClassName, snake_name, PrototypeName, ConstructorName) \
initialize_constructor(vm.names.ClassName, m_temporal_##snake_name##_constructor, m_temporal_##snake_name##_prototype);
JS_ENUMERATE_TEMPORAL_OBJECTS
#undef __JS_ENUMERATE
u8 attr = Attribute::Writable | Attribute::Configurable;
define_native_function(vm.names.gc, gc, 0, attr);
define_native_function(vm.names.isNaN, is_nan, 1, attr);
define_native_function(vm.names.isFinite, is_finite, 1, attr);
define_native_function(vm.names.parseFloat, parse_float, 1, attr);
define_native_function(vm.names.parseInt, parse_int, 2, attr);
define_native_function(vm.names.eval, eval, 1, attr);
// 10.2.4.1 %ThrowTypeError% ( ), https://tc39.es/ecma262/#sec-%throwtypeerror%
m_throw_type_error_function = NativeFunction::create(global_object(), {}, [](VM& vm, GlobalObject& global_object) {
vm.throw_exception<TypeError>(global_object, ErrorType::RestrictedFunctionPropertiesAccess);
return Value();
});
m_throw_type_error_function->define_direct_property(vm.names.length, Value(0), 0);
m_throw_type_error_function->define_direct_property(vm.names.name, js_string(vm, ""), 0);
MUST(m_throw_type_error_function->internal_prevent_extensions());
// 10.2.4 AddRestrictedFunctionProperties ( F, realm ), https://tc39.es/ecma262/#sec-addrestrictedfunctionproperties
m_function_prototype->define_direct_accessor(vm.names.caller, m_throw_type_error_function, m_throw_type_error_function, Attribute::Configurable);
m_function_prototype->define_direct_accessor(vm.names.arguments, m_throw_type_error_function, m_throw_type_error_function, Attribute::Configurable);
define_native_function(vm.names.encodeURI, encode_uri, 1, attr);
define_native_function(vm.names.decodeURI, decode_uri, 1, attr);
define_native_function(vm.names.encodeURIComponent, encode_uri_component, 1, attr);
define_native_function(vm.names.decodeURIComponent, decode_uri_component, 1, attr);
define_native_function(vm.names.escape, escape, 1, attr);
define_native_function(vm.names.unescape, unescape, 1, attr);
define_direct_property(vm.names.NaN, js_nan(), 0);
define_direct_property(vm.names.Infinity, js_infinity(), 0);
define_direct_property(vm.names.undefined, js_undefined(), 0);
define_direct_property(vm.names.globalThis, this, attr);
define_direct_property(vm.names.console, heap().allocate<ConsoleObject>(*this, *this), attr);
define_direct_property(vm.names.Atomics, heap().allocate<AtomicsObject>(*this, *this), attr);
define_direct_property(vm.names.Math, heap().allocate<MathObject>(*this, *this), attr);
define_direct_property(vm.names.JSON, heap().allocate<JSONObject>(*this, *this), attr);
define_direct_property(vm.names.Reflect, heap().allocate<ReflectObject>(*this, *this), attr);
define_direct_property(vm.names.Intl, heap().allocate<Intl::Intl>(*this, *this), attr);
define_direct_property(vm.names.Temporal, heap().allocate<Temporal::Temporal>(*this, *this), attr);
// This must be initialized before allocating AggregateErrorConstructor, which uses ErrorConstructor as its prototype.
initialize_constructor(vm.names.Error, m_error_constructor, m_error_prototype);
add_constructor(vm.names.AggregateError, m_aggregate_error_constructor, m_aggregate_error_prototype);
add_constructor(vm.names.Array, m_array_constructor, m_array_prototype);
add_constructor(vm.names.ArrayBuffer, m_array_buffer_constructor, m_array_buffer_prototype);
add_constructor(vm.names.BigInt, m_bigint_constructor, m_bigint_prototype);
add_constructor(vm.names.Boolean, m_boolean_constructor, m_boolean_prototype);
add_constructor(vm.names.DataView, m_data_view_constructor, m_data_view_prototype);
add_constructor(vm.names.Date, m_date_constructor, m_date_prototype);
add_constructor(vm.names.Error, m_error_constructor, m_error_prototype);
add_constructor(vm.names.FinalizationRegistry, m_finalization_registry_constructor, m_finalization_registry_prototype);
add_constructor(vm.names.Function, m_function_constructor, m_function_prototype);
add_constructor(vm.names.Map, m_map_constructor, m_map_prototype);
add_constructor(vm.names.Number, m_number_constructor, m_number_prototype);
add_constructor(vm.names.Object, m_object_constructor, m_object_prototype);
add_constructor(vm.names.Promise, m_promise_constructor, m_promise_prototype);
add_constructor(vm.names.Proxy, m_proxy_constructor, nullptr);
add_constructor(vm.names.RegExp, m_regexp_constructor, m_regexp_prototype);
add_constructor(vm.names.Set, m_set_constructor, m_set_prototype);
add_constructor(vm.names.ShadowRealm, m_shadow_realm_constructor, m_shadow_realm_prototype);
add_constructor(vm.names.String, m_string_constructor, m_string_prototype);
add_constructor(vm.names.Symbol, m_symbol_constructor, m_symbol_prototype);
add_constructor(vm.names.WeakMap, m_weak_map_constructor, m_weak_map_prototype);
add_constructor(vm.names.WeakRef, m_weak_ref_constructor, m_weak_ref_prototype);
add_constructor(vm.names.WeakSet, m_weak_set_constructor, m_weak_set_prototype);
initialize_constructor(vm.names.TypedArray, m_typed_array_constructor, m_typed_array_prototype);
#define __JS_ENUMERATE(ClassName, snake_name, PrototypeName, ConstructorName, ArrayType) \
add_constructor(vm.names.ClassName, m_##snake_name##_constructor, m_##snake_name##_prototype);
JS_ENUMERATE_NATIVE_ERRORS
JS_ENUMERATE_TYPED_ARRAYS
#undef __JS_ENUMERATE
// The generator constructor cannot be initialized with add_constructor as it has no global binding
m_generator_function_constructor = heap().allocate<GeneratorFunctionConstructor>(*this, *this);
// 27.3.3.1 GeneratorFunction.prototype.constructor, https://tc39.es/ecma262/#sec-generatorfunction.prototype.constructor
m_generator_function_prototype->define_direct_property(vm.names.constructor, m_generator_function_constructor, Attribute::Configurable);
m_array_prototype_values_function = &m_array_prototype->get_without_side_effects(vm.names.values).as_function();
m_eval_function = &get_without_side_effects(vm.names.eval).as_function();
m_temporal_time_zone_prototype_get_offset_nanoseconds_for_function = &m_temporal_time_zone_prototype->get_without_side_effects(vm.names.getOffsetNanosecondsFor).as_function();
}
GlobalObject::~GlobalObject()
{
}
void GlobalObject::visit_edges(Visitor& visitor)
{
Base::visit_edges(visitor);
visitor.visit(m_empty_object_shape);
visitor.visit(m_new_object_shape);
visitor.visit(m_new_ordinary_function_prototype_object_shape);
visitor.visit(m_proxy_constructor);
visitor.visit(m_generator_object_prototype);
visitor.visit(m_array_prototype_values_function);
visitor.visit(m_eval_function);
visitor.visit(m_temporal_time_zone_prototype_get_offset_nanoseconds_for_function);
visitor.visit(m_throw_type_error_function);
#define __JS_ENUMERATE(ClassName, snake_name, PrototypeName, ConstructorName, ArrayType) \
visitor.visit(m_##snake_name##_constructor); \
visitor.visit(m_##snake_name##_prototype);
JS_ENUMERATE_BUILTIN_TYPES
#undef __JS_ENUMERATE
#define __JS_ENUMERATE(ClassName, snake_name, PrototypeName, ConstructorName) \
visitor.visit(m_intl_##snake_name##_constructor); \
visitor.visit(m_intl_##snake_name##_prototype);
JS_ENUMERATE_INTL_OBJECTS
#undef __JS_ENUMERATE
#define __JS_ENUMERATE(ClassName, snake_name, PrototypeName, ConstructorName) \
visitor.visit(m_temporal_##snake_name##_constructor); \
visitor.visit(m_temporal_##snake_name##_prototype);
JS_ENUMERATE_TEMPORAL_OBJECTS
#undef __JS_ENUMERATE
#define __JS_ENUMERATE(ClassName, snake_name) \
visitor.visit(m_##snake_name##_prototype);
JS_ENUMERATE_ITERATOR_PROTOTYPES
#undef __JS_ENUMERATE
}
Realm* GlobalObject::associated_realm()
{
return m_associated_realm;
}
void GlobalObject::set_associated_realm(Badge<Realm>, Realm& realm)
{
m_associated_realm = &realm;
}
JS_DEFINE_NATIVE_FUNCTION(GlobalObject::gc)
{
#ifdef __serenity__
dbgln("Forced garbage collection requested!");
#endif
vm.heap().collect_garbage();
return js_undefined();
}
// 19.2.3 isNaN ( number ), https://tc39.es/ecma262/#sec-isnan-number
JS_DEFINE_NATIVE_FUNCTION(GlobalObject::is_nan)
{
auto number = vm.argument(0).to_number(global_object);
if (vm.exception())
return {};
return Value(number.is_nan());
}
// 19.2.2 isFinite ( number ), https://tc39.es/ecma262/#sec-isfinite-number
JS_DEFINE_NATIVE_FUNCTION(GlobalObject::is_finite)
{
auto number = vm.argument(0).to_number(global_object);
if (vm.exception())
return {};
return Value(number.is_finite_number());
}
// 19.2.4 parseFloat ( string ), https://tc39.es/ecma262/#sec-parsefloat-string
JS_DEFINE_NATIVE_FUNCTION(GlobalObject::parse_float)
{
if (vm.argument(0).is_number())
return vm.argument(0);
auto input_string = TRY_OR_DISCARD(vm.argument(0).to_string(global_object));
auto trimmed_string = input_string.trim_whitespace(TrimMode::Left);
for (size_t length = trimmed_string.length(); length > 0; --length) {
// This can't throw, so no exception check is fine.
auto number = Value(js_string(vm, trimmed_string.substring(0, length))).to_number(global_object);
if (!number.is_nan())
return number;
}
return js_nan();
}
// 19.2.5 parseInt ( string, radix ), https://tc39.es/ecma262/#sec-parseint-string-radix
JS_DEFINE_NATIVE_FUNCTION(GlobalObject::parse_int)
{
auto input_string = TRY_OR_DISCARD(vm.argument(0).to_string(global_object));
// FIXME: There's a bunch of unnecessary string copying here.
double sign = 1;
auto s = input_string.trim_whitespace(TrimMode::Left);
if (!s.is_empty() && s[0] == '-')
sign = -1;
if (!s.is_empty() && (s[0] == '+' || s[0] == '-'))
s = s.substring(1, s.length() - 1);
auto radix = vm.argument(1).to_i32(global_object);
if (vm.exception())
return {};
bool strip_prefix = true;
if (radix != 0) {
if (radix < 2 || radix > 36)
return js_nan();
if (radix != 16)
strip_prefix = false;
} else {
radix = 10;
}
if (strip_prefix) {
if (s.length() >= 2 && s[0] == '0' && (s[1] == 'x' || s[1] == 'X')) {
s = s.substring(2, s.length() - 2);
radix = 16;
}
}
auto parse_digit = [&](u32 code_point, i32 radix) -> Optional<i32> {
if (!is_ascii_alphanumeric(code_point) || radix <= 0)
return {};
auto digit = parse_ascii_base36_digit(code_point);
if (digit >= (u32)radix)
return {};
return digit;
};
bool had_digits = false;
double number = 0;
for (auto code_point : Utf8View(s)) {
auto digit = parse_digit(code_point, radix);
if (!digit.has_value())
break;
had_digits = true;
number *= radix;
number += digit.value();
}
if (!had_digits)
return js_nan();
return Value(sign * number);
}
// 19.2.1 eval ( x ), https://tc39.es/ecma262/#sec-eval-x
JS_DEFINE_NATIVE_FUNCTION(GlobalObject::eval)
{
return TRY_OR_DISCARD(perform_eval(vm.argument(0), global_object, CallerMode::NonStrict, EvalMode::Indirect));
}
// 19.2.6.1.1 Encode ( string, unescapedSet ), https://tc39.es/ecma262/#sec-encode
static String encode([[maybe_unused]] JS::GlobalObject& global_object, const String& string, StringView unescaped_set)
{
StringBuilder encoded_builder;
for (unsigned char code_unit : string) {
if (unescaped_set.contains(code_unit)) {
encoded_builder.append(code_unit);
continue;
}
// FIXME: check for unpaired surrogates and throw URIError
encoded_builder.appendff("%{:02X}", code_unit);
}
return encoded_builder.build();
}
// 19.2.6.1.2 Decode ( string, reservedSet ), https://tc39.es/ecma262/#sec-decode
static String decode(JS::GlobalObject& global_object, const String& string, StringView reserved_set)
{
StringBuilder decoded_builder;
auto expected_continuation_bytes = 0;
for (size_t k = 0; k < string.length(); k++) {
auto code_unit = string[k];
if (code_unit != '%') {
if (expected_continuation_bytes > 0) {
global_object.vm().throw_exception<URIError>(global_object, ErrorType::URIMalformed);
return {};
}
decoded_builder.append(code_unit);
continue;
}
if (k + 2 >= string.length()) {
global_object.vm().throw_exception<URIError>(global_object, ErrorType::URIMalformed);
return {};
}
auto first_digit = decode_hex_digit(string[k + 1]);
if (first_digit >= 16) {
global_object.vm().throw_exception<URIError>(global_object, ErrorType::URIMalformed);
return {};
}
auto second_digit = decode_hex_digit(string[k + 2]);
if (second_digit >= 16) {
global_object.vm().throw_exception<URIError>(global_object, ErrorType::URIMalformed);
return {};
}
char decoded_code_unit = (first_digit << 4) | second_digit;
k += 2;
if (expected_continuation_bytes > 0) {
decoded_builder.append(decoded_code_unit);
expected_continuation_bytes--;
continue;
}
if ((decoded_code_unit & 0x80) == 0) {
if (reserved_set.contains(decoded_code_unit))
decoded_builder.append(string.substring_view(k - 2, 3));
else
decoded_builder.append(decoded_code_unit);
continue;
}
auto leading_ones = count_trailing_zeroes_32_safe(~decoded_code_unit) - 24;
if (leading_ones == 1 || leading_ones > 4) {
global_object.vm().throw_exception<URIError>(global_object, ErrorType::URIMalformed);
return {};
}
decoded_builder.append(decoded_code_unit);
expected_continuation_bytes = leading_ones - 1;
}
return decoded_builder.build();
}
// 19.2.6.4 encodeURI ( uri ), https://tc39.es/ecma262/#sec-encodeuri-uri
JS_DEFINE_NATIVE_FUNCTION(GlobalObject::encode_uri)
{
auto uri_string = TRY_OR_DISCARD(vm.argument(0).to_string(global_object));
auto encoded = encode(global_object, uri_string, ";/?:@&=+$,abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_.!~*'()#"sv);
if (vm.exception())
return {};
return js_string(vm, move(encoded));
}
// 19.2.6.2 decodeURI ( encodedURI ), https://tc39.es/ecma262/#sec-decodeuri-encodeduri
JS_DEFINE_NATIVE_FUNCTION(GlobalObject::decode_uri)
{
auto uri_string = TRY_OR_DISCARD(vm.argument(0).to_string(global_object));
auto decoded = decode(global_object, uri_string, ";/?:@&=+$,#"sv);
if (vm.exception())
return {};
return js_string(vm, move(decoded));
}
// 19.2.6.5 encodeURIComponent ( uriComponent ), https://tc39.es/ecma262/#sec-encodeuricomponent-uricomponent
JS_DEFINE_NATIVE_FUNCTION(GlobalObject::encode_uri_component)
{
auto uri_string = TRY_OR_DISCARD(vm.argument(0).to_string(global_object));
auto encoded = encode(global_object, uri_string, "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_.!~*'()"sv);
if (vm.exception())
return {};
return js_string(vm, move(encoded));
}
// 19.2.6.3 decodeURIComponent ( encodedURIComponent ), https://tc39.es/ecma262/#sec-decodeuricomponent-encodeduricomponent
JS_DEFINE_NATIVE_FUNCTION(GlobalObject::decode_uri_component)
{
auto uri_string = TRY_OR_DISCARD(vm.argument(0).to_string(global_object));
auto decoded = decode(global_object, uri_string, ""sv);
if (vm.exception())
return {};
return js_string(vm, move(decoded));
}
// B.2.1.1 escape ( string ), https://tc39.es/ecma262/#sec-escape-string
JS_DEFINE_NATIVE_FUNCTION(GlobalObject::escape)
{
auto string = TRY_OR_DISCARD(vm.argument(0).to_string(global_object));
StringBuilder escaped;
for (auto code_point : Utf8View(string)) {
if (code_point < 256) {
if ("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789@*_+-./"sv.contains(code_point))
escaped.append(code_point);
else
escaped.appendff("%{:02X}", code_point);
continue;
}
escaped.appendff("%u{:04X}", code_point); // FIXME: Handle utf-16 surrogate pairs
}
return js_string(vm, escaped.build());
}
// B.2.1.2 unescape ( string ), https://tc39.es/ecma262/#sec-unescape-string
JS_DEFINE_NATIVE_FUNCTION(GlobalObject::unescape)
{
auto string = TRY_OR_DISCARD(vm.argument(0).to_string(global_object));
ssize_t length = string.length();
StringBuilder unescaped(length);
for (auto k = 0; k < length; ++k) {
u32 code_point = string[k];
if (code_point == '%') {
if (k <= length - 6 && string[k + 1] == 'u' && is_ascii_hex_digit(string[k + 2]) && is_ascii_hex_digit(string[k + 3]) && is_ascii_hex_digit(string[k + 4]) && is_ascii_hex_digit(string[k + 5])) {
code_point = (parse_ascii_hex_digit(string[k + 2]) << 12) | (parse_ascii_hex_digit(string[k + 3]) << 8) | (parse_ascii_hex_digit(string[k + 4]) << 4) | parse_ascii_hex_digit(string[k + 5]);
k += 5;
} else if (k <= length - 3 && is_ascii_hex_digit(string[k + 1]) && is_ascii_hex_digit(string[k + 2])) {
code_point = (parse_ascii_hex_digit(string[k + 1]) << 4) | parse_ascii_hex_digit(string[k + 2]);
k += 2;
}
}
unescaped.append_code_point(code_point);
}
return js_string(vm, unescaped.build());
}
}
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