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LibIDL+IDLGenerators: Begin supporting UTF-16 strings in IDL

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This adds a new IDL type, Utf16DOMString. This is the same as DOMString,
except it is UTF-16. This type is temporary - we will want DOMString to
be UTF-16 by default once we've ported enough of LibWeb.

To make this support easier, some string IDL generator handling is moved
directly into `generate_to_string` from the call sites.
This commit is contained in:
Timothy Flynn 2025-07-24 12:01:14 -04:00 • committed by Jelle Raaijmakers
commit cb85eac3d8
Notes: github-actions[bot] 2025-07-24 17:01:40 +00:00
2 changed files with 25 additions and 13 deletions
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2
Libraries/LibIDL/Types.h
View file

@ -119,7 +119,7 @@ public:
// https://webidl.spec.whatwg.org/#idl-symbol
bool is_symbol() const { return is_plain() && m_name == "symbol"; }
bool is_string() const { return is_plain() && m_name.is_one_of("ByteString", "CSSOMString", "DOMString", "USVString"); }
bool is_string() const { return is_plain() && m_name.is_one_of("ByteString", "CSSOMString", "DOMString", "Utf16DOMString", "USVString"); }
// https://webidl.spec.whatwg.org/#dfn-integer-type
bool is_integer() const { return is_plain() && m_name.is_one_of("byte", "octet", "short", "unsigned short", "long", "unsigned long", "long long", "unsigned long long"); }

36
Meta/Lagom/Tools/CodeGenerators/LibWeb/BindingsGenerator/IDLGenerators.cpp
View file

@ -224,8 +224,11 @@ CppType idl_type_name_to_cpp_type(Type const& type, Interface const& interface)
if (interface.callback_functions.contains(type.name()))
return { .name = "GC::Root<WebIDL::CallbackType>", .sequence_storage_type = SequenceStorageType::RootVector };
if (type.is_string())
if (type.is_string()) {
if (type.name().contains("Utf16"sv))
return { .name = "Utf16String", .sequence_storage_type = SequenceStorageType::Vector };
return { .name = "String", .sequence_storage_type = SequenceStorageType::Vector };
}
if ((type.name() == "double" || type.name() == "unrestricted double") && !type.is_nullable())
return { .name = "double", .sequence_storage_type = SequenceStorageType::Vector };
@ -412,17 +415,27 @@ static void emit_includes_for_all_imports(auto& interface, auto& generator, bool
template<typename ParameterType>
static void generate_to_string(SourceGenerator& scoped_generator, ParameterType const& parameter, bool variadic, bool optional, Optional<ByteString> const& optional_default_value)
{
if (parameter.type->name() == "USVString") {
scoped_generator.set("to_string", "to_usv_string"sv);
} else if (parameter.type->name() == "ByteString") {
scoped_generator.set("to_string", "to_byte_string"sv);
auto is_utf16_string = parameter.type->name().contains("Utf16"sv);
auto is_fly_string = parameter.extended_attributes.contains("FlyString"sv);
if (is_utf16_string) {
scoped_generator.set("string_type", is_fly_string ? "Utf16FlyString"sv : "Utf16String"sv);
scoped_generator.set("string_suffix", "_utf16"sv);
} else {
scoped_generator.set("to_string", "to_string"sv);
scoped_generator.set("string_type", is_fly_string ? "FlyString"sv : "String"sv);
scoped_generator.set("string_suffix", "_string"sv);
}
if (parameter.type->name() == "USVString")
scoped_generator.set("to_string", "to_usv_string"sv);
else if (parameter.type->name() == "ByteString")
scoped_generator.set("to_string", "to_byte_string"sv);
else
scoped_generator.set("to_string", is_utf16_string ? "to_utf16_string"sv : "to_string"sv);
if (variadic) {
scoped_generator.append(R"~~~(
Vector<String> @cpp_name@;
Vector<@string_type@> @cpp_name@;
if (vm.argument_count() > @js_suffix@) {
@cpp_name@.ensure_capacity(vm.argument_count() - @js_suffix@);
@ -473,9 +486,10 @@ static void generate_to_string(SourceGenerator& scoped_generator, ParameterType
@cpp_name@ = TRY(WebIDL::@to_string@(vm, @js_name@@js_suffix@));
})~~~");
}
if (!may_be_null) {
scoped_generator.append(R"~~~( else {
@cpp_name@ = MUST(@string_type@::from_utf8(@parameter.optional_default_value@sv));
@cpp_name@ = @parameter.optional_default_value@@string_suffix@;
}
)~~~");
} else {
@ -587,7 +601,7 @@ static void generate_to_integral(SourceGenerator& scoped_generator, ParameterTyp
}
template<typename ParameterType>
static void generate_to_cpp(SourceGenerator& generator, ParameterType& parameter, ByteString const& js_name, ByteString const& js_suffix, ByteString const& cpp_name, IDL::Interface const& interface, bool legacy_null_to_empty_string = false, bool optional = false, Optional<ByteString> optional_default_value = {}, bool variadic = false, size_t recursion_depth = 0, bool string_to_fly_string = false)
static void generate_to_cpp(SourceGenerator& generator, ParameterType& parameter, ByteString const& js_name, ByteString const& js_suffix, ByteString const& cpp_name, IDL::Interface const& interface, bool legacy_null_to_empty_string = false, bool optional = false, Optional<ByteString> optional_default_value = {}, bool variadic = false, size_t recursion_depth = 0)
{
auto scoped_generator = generator.fork();
auto acceptable_cpp_name = make_input_acceptable_cpp(cpp_name);
@ -596,7 +610,6 @@ static void generate_to_cpp(SourceGenerator& generator, ParameterType& parameter
scoped_generator.set("js_name", js_name);
scoped_generator.set("js_suffix", js_suffix);
scoped_generator.set("legacy_null_to_empty_string", legacy_null_to_empty_string ? "true" : "false");
scoped_generator.set("string_type", string_to_fly_string ? "FlyString" : "String");
scoped_generator.set("parameter.type.name", parameter.type->name());
scoped_generator.set("parameter.name", parameter.name);
@ -1749,8 +1762,7 @@ static void generate_arguments(SourceGenerator& generator, Vector<IDL::Parameter
}
bool legacy_null_to_empty_string = parameter.extended_attributes.contains("LegacyNullToEmptyString");
bool fly_string = parameter.extended_attributes.contains("FlyString");
generate_to_cpp(generator, parameter, "arg", ByteString::number(argument_index), parameter.name.to_snakecase(), interface, legacy_null_to_empty_string, parameter.optional, parameter.optional_default_value, parameter.variadic, 0, fly_string);
generate_to_cpp(generator, parameter, "arg", ByteString::number(argument_index), parameter.name.to_snakecase(), interface, legacy_null_to_empty_string, parameter.optional, parameter.optional_default_value, parameter.variadic, 0);
++argument_index;
}