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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/StringBuilder.h>
#include <AK/Utf32View.h>
#include <LibJS/Runtime/Array.h>
#include <LibJS/Runtime/Error.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/StringConstructor.h>
#include <LibJS/Runtime/StringObject.h>
namespace JS {
StringConstructor::StringConstructor(GlobalObject& global_object)
: NativeFunction(vm().names.String, *global_object.function_prototype())
{
}
void StringConstructor::initialize(GlobalObject& global_object)
{
auto& vm = this->vm();
NativeFunction::initialize(global_object);
// 22.1.2.3 String.prototype, https://tc39.es/ecma262/#sec-string.prototype
define_property(vm.names.prototype, global_object.string_prototype(), 0);
define_property(vm.names.length, Value(1), Attribute::Configurable);
u8 attr = Attribute::Writable | Attribute::Configurable;
define_native_function(vm.names.raw, raw, 1, attr);
define_native_function(vm.names.fromCharCode, from_char_code, 1, attr);
}
StringConstructor::~StringConstructor()
{
}
// 22.1.1.1 String ( value ), https://tc39.es/ecma262/#sec-string-constructor-string-value
Value StringConstructor::call()
{
if (!vm().argument_count())
return js_string(heap(), "");
if (vm().argument(0).is_symbol())
return js_string(heap(), vm().argument(0).as_symbol().to_string());
auto* string = vm().argument(0).to_primitive_string(global_object());
if (vm().exception())
return {};
return string;
}
// 22.1.1.1 String ( value ), https://tc39.es/ecma262/#sec-string-constructor-string-value
Value StringConstructor::construct(Function&)
{
PrimitiveString* primitive_string = nullptr;
if (!vm().argument_count())
primitive_string = js_string(vm(), "");
else
primitive_string = vm().argument(0).to_primitive_string(global_object());
if (!primitive_string)
return {};
return StringObject::create(global_object(), *primitive_string);
}
// 22.1.2.4 String.raw ( template, ...substitutions ), https://tc39.es/ecma262/#sec-string.raw
JS_DEFINE_NATIVE_FUNCTION(StringConstructor::raw)
{
auto* template_object = vm.argument(0).to_object(global_object);
if (vm.exception())
return {};
auto raw = template_object->get(vm.names.raw);
if (vm.exception())
return {};
if (raw.is_empty() || raw.is_nullish()) {
vm.throw_exception<TypeError>(global_object, ErrorType::StringRawCannotConvert, raw.is_null() ? "null" : "undefined");
return {};
}
// FIXME: This should use length_of_array_like() and work with any object
if (!raw.is_object() || !raw.as_object().is_array())
return js_string(vm, "");
auto* array = static_cast<Array*>(raw.to_object(global_object));
auto& raw_array_elements = array->indexed_properties();
StringBuilder builder;
for (size_t i = 0; i < raw_array_elements.array_like_size(); ++i) {
auto result = raw_array_elements.get(array, i);
if (vm.exception())
return {};
if (!result.has_value())
continue;
builder.append(result.value().value.to_string(global_object));
if (vm.exception())
return {};
if (i + 1 < vm.argument_count() && i < raw_array_elements.array_like_size() - 1) {
builder.append(vm.argument(i + 1).to_string(global_object));
if (vm.exception())
return {};
}
}
return js_string(vm, builder.build());
}
// 22.1.2.1 String.fromCharCode ( ...codeUnits ), https://tc39.es/ecma262/#sec-string.fromcharcode
JS_DEFINE_NATIVE_FUNCTION(StringConstructor::from_char_code)
{
StringBuilder builder;
for (size_t i = 0; i < vm.argument_count(); ++i) {
auto char_code = vm.argument(i).to_i32(global_object);
if (vm.exception())
return {};
auto truncated = char_code & 0xffff;
// FIXME: We need an Utf16View :^)
builder.append(Utf32View((u32*)&truncated, 1));
}
return js_string(vm, builder.build());
}
}
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