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LibJS: Add spec comments to StringConstructor
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1b3c3f9777
commit
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1 changed files with 110 additions and 43 deletions
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@ -44,11 +44,20 @@ ThrowCompletionOr<void> StringConstructor::initialize(Realm& realm)
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ThrowCompletionOr<Value> StringConstructor::call()
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{
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auto& vm = this->vm();
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auto value = vm.argument(0);
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// 1. If value is not present, let s be the empty String.
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if (!vm.argument_count())
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return PrimitiveString::create(vm, String {});
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if (vm.argument(0).is_symbol())
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return PrimitiveString::create(vm, TRY_OR_THROW_OOM(vm, vm.argument(0).as_symbol().descriptive_string()));
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return TRY(vm.argument(0).to_primitive_string(vm));
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// 2. Else,
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// a. If NewTarget is undefined and value is a Symbol, return SymbolDescriptiveString(value).
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if (value.is_symbol())
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return PrimitiveString::create(vm, TRY_OR_THROW_OOM(vm, value.as_symbol().descriptive_string()));
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// b. Let s be ? ToString(value).
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// 3. If NewTarget is undefined, return s.
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return TRY(value.to_primitive_string(vm));
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}
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// 22.1.1.1 String ( value ), https://tc39.es/ecma262/#sec-string-constructor-string-value
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@ -56,79 +65,137 @@ ThrowCompletionOr<NonnullGCPtr<Object>> StringConstructor::construct(FunctionObj
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{
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auto& vm = this->vm();
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auto& realm = *vm.current_realm();
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auto value = vm.argument(0);
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PrimitiveString* primitive_string;
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if (!vm.argument_count())
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// 1. If value is not present, let s be the empty String.
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if (!vm.argument_count()) {
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primitive_string = PrimitiveString::create(vm, String {});
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else
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primitive_string = TRY(vm.argument(0).to_primitive_string(vm));
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}
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// 2. Else,
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else {
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// b. Let s be ? ToString(value).
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primitive_string = TRY(value.to_primitive_string(vm));
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}
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// 4. Return StringCreate(s, ? GetPrototypeFromConstructor(NewTarget, "%String.prototype%")).
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auto* prototype = TRY(get_prototype_from_constructor(vm, new_target, &Intrinsics::string_prototype));
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return MUST_OR_THROW_OOM(StringObject::create(realm, *primitive_string, *prototype));
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}
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// 22.1.2.4 String.raw ( template, ...substitutions ), https://tc39.es/ecma262/#sec-string.raw
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JS_DEFINE_NATIVE_FUNCTION(StringConstructor::raw)
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{
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auto* cooked = TRY(vm.argument(0).to_object(vm));
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auto raw_value = TRY(cooked->get(vm.names.raw));
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auto* raw = TRY(raw_value.to_object(vm));
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auto literal_segments = TRY(length_of_array_like(vm, *raw));
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if (literal_segments == 0)
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return PrimitiveString::create(vm, String {});
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auto const number_of_substituions = vm.argument_count() - 1;
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StringBuilder builder;
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for (size_t i = 0; i < literal_segments; ++i) {
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auto next_key = DeprecatedString::number(i);
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auto next_segment_value = TRY(raw->get(next_key));
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auto next_segment = TRY(next_segment_value.to_deprecated_string(vm));
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builder.append(next_segment);
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if (i + 1 == literal_segments)
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break;
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if (i < number_of_substituions) {
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auto next = vm.argument(i + 1);
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auto next_sub = TRY(next.to_deprecated_string(vm));
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builder.append(next_sub);
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}
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}
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return PrimitiveString::create(vm, builder.to_deprecated_string());
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}
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// 22.1.2.1 String.fromCharCode ( ...codeUnits ), https://tc39.es/ecma262/#sec-string.fromcharcode
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JS_DEFINE_NATIVE_FUNCTION(StringConstructor::from_char_code)
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{
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// 1. Let result be the empty String.
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Utf16Data string;
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string.ensure_capacity(vm.argument_count());
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for (size_t i = 0; i < vm.argument_count(); ++i)
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string.append(TRY(vm.argument(i).to_u16(vm)));
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// 2. For each element next of codeUnits, do
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for (size_t i = 0; i < vm.argument_count(); ++i) {
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// a. Let nextCU be the code unit whose numeric value is ℝ(? ToUint16(next)).
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auto next_code_unit = TRY(vm.argument(i).to_u16(vm));
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// b. Set result to the string-concatenation of result and nextCU.
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string.append(next_code_unit);
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}
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// 3. Return result.
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return PrimitiveString::create(vm, TRY(Utf16String::create(vm, move(string))));
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}
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// 22.1.2.2 String.fromCodePoint ( ...codePoints ), https://tc39.es/ecma262/#sec-string.fromcodepoint
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JS_DEFINE_NATIVE_FUNCTION(StringConstructor::from_code_point)
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{
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// 1. Let result be the empty String.
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Utf16Data string;
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string.ensure_capacity(vm.argument_count()); // This will be an under-estimate if any code point is > 0xffff.
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// This will be an under-estimate if any code point is > 0xffff.
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string.ensure_capacity(vm.argument_count());
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// 2. For each element next of codePoints, do
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for (size_t i = 0; i < vm.argument_count(); ++i) {
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// a. Let nextCP be ? ToNumber(next).
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auto next_code_point = TRY(vm.argument(i).to_number(vm));
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// b. If IsIntegralNumber(nextCP) is false, throw a RangeError exception.
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if (!next_code_point.is_integral_number())
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return vm.throw_completion<RangeError>(ErrorType::InvalidCodePoint, TRY_OR_THROW_OOM(vm, next_code_point.to_string_without_side_effects()));
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auto code_point = TRY(next_code_point.to_i32(vm));
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auto code_point = MUST(next_code_point.to_i32(vm));
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// c. If ℝ(nextCP) < 0 or ℝ(nextCP) > 0x10FFFF, throw a RangeError exception.
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if (code_point < 0 || code_point > 0x10FFFF)
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return vm.throw_completion<RangeError>(ErrorType::InvalidCodePoint, TRY_OR_THROW_OOM(vm, next_code_point.to_string_without_side_effects()));
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// d. Set result to the string-concatenation of result and UTF16EncodeCodePoint(ℝ(nextCP)).
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TRY_OR_THROW_OOM(vm, code_point_to_utf16(string, static_cast<u32>(code_point)));
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}
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// 3. Assert: If codePoints is empty, then result is the empty String.
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if (!vm.argument_count())
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VERIFY(string.is_empty());
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// 4. Return result.
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return PrimitiveString::create(vm, TRY(Utf16String::create(vm, move(string))));
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}
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// 22.1.2.4 String.raw ( template, ...substitutions ), https://tc39.es/ecma262/#sec-string.raw
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JS_DEFINE_NATIVE_FUNCTION(StringConstructor::raw)
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{
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auto template_ = vm.argument(0);
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// 1. Let substitutionCount be the number of elements in substitutions.
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auto substitution_count = vm.argument_count() > 0 ? vm.argument_count() - 1 : 0;
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// 2. Let cooked be ? ToObject(template).
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auto* cooked = TRY(template_.to_object(vm));
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// 3. Let literals be ? ToObject(? Get(cooked, "raw")).
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auto* literals = TRY(TRY(cooked->get(vm.names.raw)).to_object(vm));
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// 4. Let literalCount be ? LengthOfArrayLike(literals).
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auto literal_count = TRY(length_of_array_like(vm, *literals));
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// 5. If literalCount ≤ 0, return the empty String.
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if (literal_count == 0)
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return PrimitiveString::create(vm, String {});
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// 6. Let R be the empty String.
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StringBuilder builder;
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// 7. Let nextIndex be 0.
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// 8. Repeat,
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for (size_t i = 0; i < literal_count; ++i) {
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auto next_key = DeprecatedString::number(i);
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// a. Let nextLiteralVal be ? Get(literals, ! ToString(𝔽(nextIndex))).
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auto next_literal_value = TRY(literals->get(next_key));
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// b. Let nextLiteral be ? ToString(nextLiteralVal).
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auto next_literal = TRY(next_literal_value.to_deprecated_string(vm));
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// c. Set R to the string-concatenation of R and nextLiteral.
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builder.append(next_literal);
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// d. If nextIndex + 1 = literalCount, return R.
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if (i + 1 == literal_count)
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break;
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// e. If nextIndex < substitutionCount, then
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if (i < substitution_count) {
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// i. Let nextSubVal be substitutions[nextIndex].
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auto next_substitution_value = vm.argument(i + 1);
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// ii. Let nextSub be ? ToString(nextSubVal).
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auto next_substitution = TRY(next_substitution_value.to_deprecated_string(vm));
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// iii. Set R to the string-concatenation of R and nextSub.
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builder.append(next_substitution);
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}
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// f. Set nextIndex to nextIndex + 1.
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}
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return PrimitiveString::create(vm, builder.to_deprecated_string());
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}
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}
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