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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/StringBuilder.h>
#include <AK/Utf16View.h>
#include <AK/Utf32View.h>
#include <LibJS/Runtime/AbstractOperations.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>
#include <LibJS/Runtime/Utf16String.h>
namespace JS {
StringConstructor::StringConstructor(Realm& realm)
: NativeFunction(realm.vm().names.String.as_string(), realm.intrinsics().function_prototype())
{
}
ThrowCompletionOr<void> StringConstructor::initialize(Realm& realm)
{
auto& vm = this->vm();
MUST_OR_THROW_OOM(NativeFunction::initialize(realm));
// 22.1.2.3 String.prototype, https://tc39.es/ecma262/#sec-string.prototype
define_direct_property(vm.names.prototype, realm.intrinsics().string_prototype(), 0);
u8 attr = Attribute::Writable | Attribute::Configurable;
define_native_function(realm, vm.names.raw, raw, 1, attr);
define_native_function(realm, vm.names.fromCharCode, from_char_code, 1, attr);
define_native_function(realm, vm.names.fromCodePoint, from_code_point, 1, attr);
define_direct_property(vm.names.length, Value(1), Attribute::Configurable);
return {};
}
// 22.1.1.1 String ( value ), https://tc39.es/ecma262/#sec-string-constructor-string-value
ThrowCompletionOr<Value> StringConstructor::call()
{
auto& vm = this->vm();
auto value = vm.argument(0);
// 1. If value is not present, let s be the empty String.
if (!vm.argument_count())
return PrimitiveString::create(vm, String {});
// 2. Else,
// a. If NewTarget is undefined and value is a Symbol, return SymbolDescriptiveString(value).
if (value.is_symbol())
return PrimitiveString::create(vm, TRY_OR_THROW_OOM(vm, value.as_symbol().descriptive_string()));
// b. Let s be ? ToString(value).
// 3. If NewTarget is undefined, return s.
return TRY(value.to_primitive_string(vm));
}
// 22.1.1.1 String ( value ), https://tc39.es/ecma262/#sec-string-constructor-string-value
ThrowCompletionOr<NonnullGCPtr<Object>> StringConstructor::construct(FunctionObject& new_target)
{
auto& vm = this->vm();
auto& realm = *vm.current_realm();
auto value = vm.argument(0);
PrimitiveString* primitive_string;
// 1. If value is not present, let s be the empty String.
if (!vm.argument_count()) {
primitive_string = PrimitiveString::create(vm, String {});
}
// 2. Else,
else {
// b. Let s be ? ToString(value).
primitive_string = TRY(value.to_primitive_string(vm));
}
// 4. Return StringCreate(s, ? GetPrototypeFromConstructor(NewTarget, "%String.prototype%")).
auto* prototype = TRY(get_prototype_from_constructor(vm, new_target, &Intrinsics::string_prototype));
return MUST_OR_THROW_OOM(StringObject::create(realm, *primitive_string, *prototype));
}
// 22.1.2.1 String.fromCharCode ( ...codeUnits ), https://tc39.es/ecma262/#sec-string.fromcharcode
JS_DEFINE_NATIVE_FUNCTION(StringConstructor::from_char_code)
{
// 1. Let result be the empty String.
Utf16Data string;
string.ensure_capacity(vm.argument_count());
// 2. For each element next of codeUnits, do
for (size_t i = 0; i < vm.argument_count(); ++i) {
// a. Let nextCU be the code unit whose numeric value is ℝ(? ToUint16(next)).
auto next_code_unit = TRY(vm.argument(i).to_u16(vm));
// b. Set result to the string-concatenation of result and nextCU.
string.append(next_code_unit);
}
// 3. Return result.
return PrimitiveString::create(vm, TRY(Utf16String::create(vm, move(string))));
}
// 22.1.2.2 String.fromCodePoint ( ...codePoints ), https://tc39.es/ecma262/#sec-string.fromcodepoint
JS_DEFINE_NATIVE_FUNCTION(StringConstructor::from_code_point)
{
// 1. Let result be the empty String.
Utf16Data string;
// This will be an under-estimate if any code point is > 0xffff.
string.ensure_capacity(vm.argument_count());
// 2. For each element next of codePoints, do
for (size_t i = 0; i < vm.argument_count(); ++i) {
// a. Let nextCP be ? ToNumber(next).
auto next_code_point = TRY(vm.argument(i).to_number(vm));
// b. If IsIntegralNumber(nextCP) is false, throw a RangeError exception.
if (!next_code_point.is_integral_number())
return vm.throw_completion<RangeError>(ErrorType::InvalidCodePoint, TRY_OR_THROW_OOM(vm, next_code_point.to_string_without_side_effects()));
auto code_point = MUST(next_code_point.to_i32(vm));
// c. If ℝ(nextCP) < 0 or ℝ(nextCP) > 0x10FFFF, throw a RangeError exception.
if (code_point < 0 || code_point > 0x10FFFF)
return vm.throw_completion<RangeError>(ErrorType::InvalidCodePoint, TRY_OR_THROW_OOM(vm, next_code_point.to_string_without_side_effects()));
// d. Set result to the string-concatenation of result and UTF16EncodeCodePoint(ℝ(nextCP)).
TRY_OR_THROW_OOM(vm, code_point_to_utf16(string, static_cast<u32>(code_point)));
}
// 3. Assert: If codePoints is empty, then result is the empty String.
if (!vm.argument_count())
VERIFY(string.is_empty());
// 4. Return result.
return PrimitiveString::create(vm, TRY(Utf16String::create(vm, move(string))));
}
// 22.1.2.4 String.raw ( template, ...substitutions ), https://tc39.es/ecma262/#sec-string.raw
JS_DEFINE_NATIVE_FUNCTION(StringConstructor::raw)
{
auto template_ = vm.argument(0);
// 1. Let substitutionCount be the number of elements in substitutions.
auto substitution_count = vm.argument_count() > 0 ? vm.argument_count() - 1 : 0;
// 2. Let cooked be ? ToObject(template).
auto cooked = TRY(template_.to_object(vm));
// 3. Let literals be ? ToObject(? Get(cooked, "raw")).
auto literals = TRY(TRY(cooked->get(vm.names.raw)).to_object(vm));
// 4. Let literalCount be ? LengthOfArrayLike(literals).
auto literal_count = TRY(length_of_array_like(vm, literals));
// 5. If literalCount ≤ 0, return the empty String.
if (literal_count == 0)
return PrimitiveString::create(vm, String {});
// 6. Let R be the empty String.
StringBuilder builder;
// 7. Let nextIndex be 0.
// 8. Repeat,
for (size_t i = 0; i < literal_count; ++i) {
auto next_key = DeprecatedString::number(i);
// a. Let nextLiteralVal be ? Get(literals, ! ToString(𝔽(nextIndex))).
auto next_literal_value = TRY(literals->get(next_key));
// b. Let nextLiteral be ? ToString(nextLiteralVal).
auto next_literal = TRY(next_literal_value.to_deprecated_string(vm));
// c. Set R to the string-concatenation of R and nextLiteral.
builder.append(next_literal);
// d. If nextIndex + 1 = literalCount, return R.
if (i + 1 == literal_count)
break;
// e. If nextIndex < substitutionCount, then
if (i < substitution_count) {
// i. Let nextSubVal be substitutions[nextIndex].
auto next_substitution_value = vm.argument(i + 1);
// ii. Let nextSub be ? ToString(nextSubVal).
auto next_substitution = TRY(next_substitution_value.to_deprecated_string(vm));
// iii. Set R to the string-concatenation of R and nextSub.
builder.append(next_substitution);
}
// f. Set nextIndex to nextIndex + 1.
}
return PrimitiveString::create(vm, builder.to_deprecated_string());
}
}
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