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IDLGenerators.cpp
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IDLGenerators.cpp
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/*
* Copyright (c) 2020-2021, Andreas Kling <[email protected]>
* Copyright (c) 2021-2022, Linus Groh <[email protected]>
* Copyright (c) 2021, Luke Wilde <[email protected]>
* Copyright (c) 2022, Ali Mohammad Pur <[email protected]>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/LexicalPath.h>
#include <AK/Queue.h>
#include <AK/QuickSort.h>
#include <LibIDL/Types.h>
Vector<StringView> s_header_search_paths;
namespace IDL {
// FIXME: Generate this automatically somehow.
static bool is_platform_object(Type const& type)
{
// NOTE: This is a hand-curated subset of platform object types that are actually relevant
// in places where this function is used. If you add IDL code and get compile errors, you
// might simply need to add another type here.
static constexpr Array types = {
"AbortSignal"sv,
"Attr"sv,
"Blob"sv,
"CanvasRenderingContext2D"sv,
"Document"sv,
"DocumentType"sv,
"EventTarget"sv,
"FileList"sv,
"ImageData"sv,
"MutationRecord"sv,
"NamedNodeMap"sv,
"Node"sv,
"Path2D"sv,
"Range"sv,
"ReadableStream"sv,
"Request"sv,
"Selection"sv,
"Text"sv,
"TextMetrics"sv,
"URLSearchParams"sv,
"WebGLRenderingContext"sv,
"Window"sv,
};
if (type.name().ends_with("Element"sv))
return true;
if (type.name().ends_with("Event"sv))
return true;
if (types.span().contains_slow(type.name()))
return true;
return false;
}
static StringView sequence_storage_type_to_cpp_storage_type_name(SequenceStorageType sequence_storage_type)
{
switch (sequence_storage_type) {
case SequenceStorageType::Vector:
return "Vector"sv;
case SequenceStorageType::MarkedVector:
return "JS::MarkedVector"sv;
default:
VERIFY_NOT_REACHED();
}
}
CppType idl_type_name_to_cpp_type(Type const& type, Interface const& interface);
static String union_type_to_variant(UnionType const& union_type, Interface const& interface)
{
StringBuilder builder;
builder.append("Variant<"sv);
auto flattened_types = union_type.flattened_member_types();
for (size_t type_index = 0; type_index < flattened_types.size(); ++type_index) {
auto& type = flattened_types.at(type_index);
if (type_index > 0)
builder.append(", "sv);
auto cpp_type = idl_type_name_to_cpp_type(type, interface);
builder.append(cpp_type.name);
}
if (union_type.includes_undefined())
builder.append(", Empty"sv);
builder.append('>');
return builder.to_string();
}
CppType idl_type_name_to_cpp_type(Type const& type, Interface const& interface)
{
if (is_platform_object(type))
return { .name = String::formatted("JS::Handle<{}>", type.name()), .sequence_storage_type = SequenceStorageType::MarkedVector };
if (type.is_string())
return { .name = "String", .sequence_storage_type = SequenceStorageType::Vector };
if (type.name() == "double" && !type.is_nullable())
return { .name = "double", .sequence_storage_type = SequenceStorageType::Vector };
if (type.name() == "float" && !type.is_nullable())
return { .name = "float", .sequence_storage_type = SequenceStorageType::Vector };
if (type.name() == "boolean" && !type.is_nullable())
return { .name = "bool", .sequence_storage_type = SequenceStorageType::Vector };
if (type.name() == "unsigned long" && !type.is_nullable())
return { .name = "u32", .sequence_storage_type = SequenceStorageType::Vector };
if (type.name() == "unsigned short" && !type.is_nullable())
return { .name = "u16", .sequence_storage_type = SequenceStorageType::Vector };
if (type.name() == "long long" && !type.is_nullable())
return { .name = "i64", .sequence_storage_type = SequenceStorageType::Vector };
if (type.name() == "unsigned long long" && !type.is_nullable())
return { .name = "u64", .sequence_storage_type = SequenceStorageType::Vector };
if (type.name() == "long" && !type.is_nullable())
return { .name = "i32", .sequence_storage_type = SequenceStorageType::Vector };
if (type.name() == "any")
return { .name = "JS::Value", .sequence_storage_type = SequenceStorageType::MarkedVector };
if (type.name() == "BufferSource")
return { .name = "JS::Handle<JS::Object>", .sequence_storage_type = SequenceStorageType::MarkedVector };
if (type.name() == "sequence") {
auto& parameterized_type = verify_cast<ParameterizedType>(type);
auto& sequence_type = parameterized_type.parameters().first();
auto sequence_cpp_type = idl_type_name_to_cpp_type(sequence_type, interface);
auto storage_type_name = sequence_storage_type_to_cpp_storage_type_name(sequence_cpp_type.sequence_storage_type);
if (sequence_cpp_type.sequence_storage_type == SequenceStorageType::MarkedVector)
return { .name = storage_type_name, .sequence_storage_type = SequenceStorageType::Vector };
return { .name = String::formatted("{}<{}>", storage_type_name, sequence_cpp_type.name), .sequence_storage_type = SequenceStorageType::Vector };
}
if (type.name() == "record") {
auto& parameterized_type = verify_cast<ParameterizedType>(type);
auto& record_key_type = parameterized_type.parameters()[0];
auto& record_value_type = parameterized_type.parameters()[1];
auto record_key_cpp_type = idl_type_name_to_cpp_type(record_key_type, interface);
auto record_value_cpp_type = idl_type_name_to_cpp_type(record_value_type, interface);
return { .name = String::formatted("OrderedHashMap<{}, {}>", record_key_cpp_type.name, record_value_cpp_type.name), .sequence_storage_type = SequenceStorageType::Vector };
}
if (is<UnionType>(type)) {
auto& union_type = verify_cast<UnionType>(type);
return { .name = union_type_to_variant(union_type, interface), .sequence_storage_type = SequenceStorageType::Vector };
}
if (!type.is_nullable()) {
for (auto& dictionary : interface.dictionaries) {
if (type.name() == dictionary.key)
return { .name = type.name(), .sequence_storage_type = SequenceStorageType::Vector };
}
}
dbgln("Unimplemented type for idl_type_name_to_cpp_type: {}{}", type.name(), type.is_nullable() ? "?" : "");
TODO();
}
static String make_input_acceptable_cpp(String const& input)
{
if (input.is_one_of("class", "template", "for", "default", "char", "namespace", "delete", "inline")) {
StringBuilder builder;
builder.append(input);
builder.append('_');
return builder.to_string();
}
return input.replace("-"sv, "_"sv, ReplaceMode::All);
}
static void generate_include_for_iterator(auto& generator, auto& iterator_path, auto& iterator_name)
{
auto iterator_generator = generator.fork();
iterator_generator.set("iterator_class.path", iterator_path);
iterator_generator.set("iterator_class.name", iterator_name);
// FIXME: These may or may not exist, because REASONS.
iterator_generator.append(R"~~~(
//#if __has_include(<LibWeb/@[email protected]>)
# include <LibWeb/@[email protected]>
//#endif
)~~~");
}
static void generate_include_for(auto& generator, auto& path)
{
auto forked_generator = generator.fork();
auto path_string = path;
for (auto& search_path : s_header_search_paths) {
if (!path.starts_with(search_path))
continue;
auto relative_path = LexicalPath::relative_path(path, search_path);
if (relative_path.length() < path_string.length())
path_string = relative_path;
}
LexicalPath include_path { path_string };
forked_generator.set("include.path", String::formatted("{}/{}.h", include_path.dirname(), include_path.title()));
forked_generator.append(R"~~~(
#include <@include.path@>
)~~~");
}
static void emit_includes_for_all_imports(auto& interface, auto& generator, bool is_iterator = false)
{
Queue<RemoveCVReference<decltype(interface)> const*> interfaces;
HashTable<String> paths_imported;
interfaces.enqueue(&interface);
while (!interfaces.is_empty()) {
auto interface = interfaces.dequeue();
if (paths_imported.contains(interface->module_own_path))
continue;
paths_imported.set(interface->module_own_path);
for (auto& imported_interface : interface->imported_modules) {
if (!paths_imported.contains(imported_interface.module_own_path))
interfaces.enqueue(&imported_interface);
}
if (!interface->will_generate_code())
continue;
generate_include_for(generator, interface->module_own_path);
if (is_iterator) {
auto iterator_name = String::formatted("{}Iterator", interface->name);
auto iterator_path = String::formatted("{}Iterator", interface->fully_qualified_name.replace("::"sv, "/"sv, ReplaceMode::All));
generate_include_for_iterator(generator, iterator_path, iterator_name);
}
}
}
template<typename ParameterType>
static void generate_to_cpp(SourceGenerator& generator, ParameterType& parameter, String const& js_name, String const& js_suffix, String const& cpp_name, IDL::Interface const& interface, bool legacy_null_to_empty_string = false, bool optional = false, Optional<String> 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);
scoped_generator.set("cpp_name", acceptable_cpp_name);
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("parameter.type.name", parameter.type->name());
if (optional_default_value.has_value())
scoped_generator.set("parameter.optional_default_value", *optional_default_value);
// FIXME: Add support for optional, variadic, nullable and default values to all types
if (parameter.type->is_string()) {
if (variadic) {
scoped_generator.append(R"~~~(
Vector<String> @cpp_name@;
@[email protected]_capacity(vm.argument_count() - @js_suffix@);
for (size_t i = @js_suffix@; i < vm.argument_count(); ++i) {
auto to_string_result = TRY(vm.argument(i).to_string(vm));
@[email protected](move(to_string_result));
}
)~~~");
} else if (!optional) {
if (!parameter.type->is_nullable()) {
scoped_generator.append(R"~~~(
String @cpp_name@;
if (@js_name@@[email protected]_null() && @legacy_null_to_empty_string@) {
@cpp_name@ = String::empty();
} else {
@cpp_name@ = TRY(@js_name@@[email protected]_string(vm));
}
)~~~");
} else {
scoped_generator.append(R"~~~(
String @cpp_name@;
if (!@js_name@@[email protected]_nullish())
@cpp_name@ = TRY(@js_name@@[email protected]_string(vm));
)~~~");
}
} else {
scoped_generator.append(R"~~~(
String @cpp_name@;
if (!@js_name@@[email protected]_undefined()) {
if (@js_name@@[email protected]_null() && @legacy_null_to_empty_string@)
@cpp_name@ = String::empty();
else
@cpp_name@ = TRY(@js_name@@[email protected]_string(vm));
})~~~");
if (optional_default_value.has_value() && (!parameter.type->is_nullable() || optional_default_value.value() != "null")) {
scoped_generator.append(R"~~~( else {
@cpp_name@ = @parameter.optional_default_value@;
}
)~~~");
} else {
scoped_generator.append(R"~~~(
)~~~");
}
}
} else if (parameter.type->name().is_one_of("EventListener", "NodeFilter")) {
// FIXME: Replace this with support for callback interfaces. https://webidl.spec.whatwg.org/#idl-callback-interface
if (parameter.type->name() == "EventListener")
scoped_generator.set("cpp_type", "IDLEventListener");
else
scoped_generator.set("cpp_type", parameter.type->name());
if (parameter.type->is_nullable()) {
scoped_generator.append(R"~~~(
@cpp_type@* @cpp_name@ = nullptr;
if (!@js_name@@[email protected]_nullish()) {
if (!@js_name@@[email protected]_object())
return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObject, @js_name@@[email protected]_string_without_side_effects());
auto* callback_type = vm.heap().allocate_without_realm<WebIDL::CallbackType>(@js_name@@[email protected]_object(), HTML::incumbent_settings_object());
@cpp_name@ = @cpp_type@::create(realm, *callback_type).ptr();
}
)~~~");
} else {
scoped_generator.append(R"~~~(
if (!@js_name@@[email protected]_object())
return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObject, @js_name@@[email protected]_string_without_side_effects());
auto* callback_type = vm.heap().allocate_without_realm<WebIDL::CallbackType>(@js_name@@[email protected]_object(), HTML::incumbent_settings_object());
auto @cpp_name@ = adopt_ref(*new @cpp_type@(move(callback_type)));
)~~~");
}
} else if (IDL::is_platform_object(*parameter.type)) {
if (!parameter.type->is_nullable()) {
if (!optional) {
scoped_generator.append(R"~~~(
if (!@js_name@@[email protected]_object() || !is<@parameter.type.name@>(@js_name@@[email protected]_object()))
return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "@parameter.type.name@");
auto& @cpp_name@ = static_cast<@parameter.type.name@&>(@js_name@@[email protected]_object());
)~~~");
} else {
scoped_generator.append(R"~~~(
Optional<JS::NonnullGCPtr<@parameter.type.name@>> @cpp_name@;
if (!@js_name@@[email protected]_undefined()) {
if (!@js_name@@[email protected]_object() || !is<@parameter.type.name@>(@js_name@@[email protected]_object()))
return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "@parameter.type.name@");
@cpp_name@ = static_cast<@parameter.type.name@&>(@js_name@@[email protected]_object());
}
)~~~");
}
} else {
scoped_generator.append(R"~~~(
@parameter.type.name@* @cpp_name@ = nullptr;
if (!@js_name@@[email protected]_nullish()) {
if (!@js_name@@[email protected]_object() || !is<@parameter.type.name@>(@js_name@@[email protected]_object()))
return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "@parameter.type.name@");
@cpp_name@ = &static_cast<@parameter.type.name@&>(@js_name@@[email protected]_object());
}
)~~~");
}
} else if (parameter.type->name() == "double" || parameter.type->name() == "float") {
if (!optional) {
scoped_generator.append(R"~~~(
@parameter.type.name@ @cpp_name@ = TRY(@js_name@@[email protected]_double(vm));
)~~~");
} else {
if (optional_default_value.has_value()) {
scoped_generator.append(R"~~~(
@parameter.type.name@ @cpp_name@;
)~~~");
} else {
scoped_generator.append(R"~~~(
Optional<@parameter.type.name@> @cpp_name@;
)~~~");
}
scoped_generator.append(R"~~~(
if (!@js_name@@[email protected]_undefined())
@cpp_name@ = TRY(@js_name@@[email protected]_double(vm));
)~~~");
if (optional_default_value.has_value()) {
scoped_generator.append(R"~~~(
else
@cpp_name@ = @parameter.optional_default_value@;
)~~~");
} else {
scoped_generator.append(R"~~~(
)~~~");
}
}
} else if (parameter.type->name() == "boolean") {
if (!optional || optional_default_value.has_value()) {
scoped_generator.append(R"~~~(
bool @cpp_name@;
)~~~");
} else {
scoped_generator.append(R"~~~(
Optional<bool> @cpp_name@;
)~~~");
}
if (optional) {
scoped_generator.append(R"~~~(
if (!@js_name@@[email protected]_undefined())
)~~~");
}
scoped_generator.append(R"~~~(
@cpp_name@ = @js_name@@[email protected]_boolean();
)~~~");
if (optional_default_value.has_value()) {
scoped_generator.append(R"~~~(
else
@cpp_name@ = @parameter.optional_default_value@;
)~~~");
}
} else if (parameter.type->name() == "unsigned long") {
if (!optional || optional_default_value.has_value()) {
scoped_generator.append(R"~~~(
u32 @cpp_name@;
)~~~");
} else {
scoped_generator.append(R"~~~(
Optional<u32> @cpp_name@;
)~~~");
}
if (optional) {
scoped_generator.append(R"~~~(
if (!@js_name@@[email protected]_undefined())
)~~~");
}
scoped_generator.append(R"~~~(
@cpp_name@ = TRY(@js_name@@[email protected]_u32(vm));
)~~~");
if (optional_default_value.has_value()) {
scoped_generator.append(R"~~~(
else
@cpp_name@ = @parameter.optional_default_value@UL;
)~~~");
}
} else if (parameter.type->name() == "unsigned short") {
if (!optional || optional_default_value.has_value()) {
scoped_generator.append(R"~~~(
u16 @cpp_name@;
)~~~");
} else {
scoped_generator.append(R"~~~(
Optional<u16> @cpp_name@;
)~~~");
}
if (optional) {
scoped_generator.append(R"~~~(
if (!@js_name@@[email protected]_undefined())
)~~~");
}
scoped_generator.append(R"~~~(
@cpp_name@ = TRY(@js_name@@[email protected]_u16(vm));
)~~~");
if (optional_default_value.has_value()) {
scoped_generator.append(R"~~~(
else
@cpp_name@ = @parameter.optional_default_value@;
)~~~");
}
} else if (parameter.type->name() == "long") {
if (!optional || optional_default_value.has_value()) {
scoped_generator.append(R"~~~(
i32 @cpp_name@;
)~~~");
} else {
scoped_generator.append(R"~~~(
Optional<i32> @cpp_name@;
)~~~");
}
if (optional) {
scoped_generator.append(R"~~~(
if (!@js_name@@[email protected]_undefined())
)~~~");
}
scoped_generator.append(R"~~~(
@cpp_name@ = TRY(@js_name@@[email protected]_i32(vm));
)~~~");
if (optional_default_value.has_value()) {
scoped_generator.append(R"~~~(
else
@cpp_name@ = @parameter.optional_default_value@L;
)~~~");
}
} else if (parameter.type->name() == "long long") {
if (!optional || optional_default_value.has_value()) {
scoped_generator.append(R"~~~(
i64 @cpp_name@;
)~~~");
} else {
scoped_generator.append(R"~~~(
Optional<i64> @cpp_name@;
)~~~");
}
if (optional) {
scoped_generator.append(R"~~~(
if (!@js_name@@[email protected]_undefined())
)~~~");
}
scoped_generator.append(R"~~~(
@cpp_name@ = TRY(@js_name@@[email protected]_bigint_int64(vm));
)~~~");
if (optional_default_value.has_value()) {
scoped_generator.append(R"~~~(
else
@cpp_name@ = @parameter.optional_default_value@L;
)~~~");
}
} else if (parameter.type->name() == "Promise") {
// NOTE: It's not clear to me where the implicit wrapping of non-Promise values in a resolved
// Promise is defined in the spec; https://webidl.spec.whatwg.org/#idl-promise doesn't say
// anything of this sort. Both Gecko and Blink do it, however, so I'm sure it's correct.
scoped_generator.append(R"~~~(
if (!@js_name@@[email protected]_object() || !is<JS::Promise>(@js_name@@[email protected]_object())) {
auto* new_promise = JS::Promise::create(realm);
new_promise->fulfill(@js_name@@js_suffix@);
@js_name@@js_suffix@ = new_promise;
}
auto @cpp_name@ = JS::make_handle(&static_cast<JS::Promise&>(@js_name@@[email protected]_object()));
)~~~");
} else if (parameter.type->name() == "BufferSource") {
scoped_generator.append(R"~~~(
if (!@js_name@@[email protected]_object() || !(is<JS::TypedArrayBase>(@js_name@@[email protected]_object()) || is<JS::ArrayBuffer>(@js_name@@[email protected]_object()) || is<JS::DataView>(@js_name@@[email protected]_object())))
return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "@parameter.type.name@");
// TODO: Should we make this a Variant?
auto @cpp_name@ = JS::make_handle(&@js_name@@[email protected]_object());
)~~~");
} else if (parameter.type->name() == "any") {
if (!optional) {
scoped_generator.append(R"~~~(
auto @cpp_name@ = @js_name@@js_suffix@;
)~~~");
} else {
scoped_generator.append(R"~~~(
JS::Value @cpp_name@ = JS::js_undefined();
if (!@js_name@@[email protected]_undefined())
@cpp_name@ = @js_name@@js_suffix@;
)~~~");
if (optional_default_value.has_value()) {
if (optional_default_value == "null") {
scoped_generator.append(R"~~~(
else
@cpp_name@ = JS::js_null();
)~~~");
} else if (optional_default_value->to_int().has_value() || optional_default_value->to_uint().has_value()) {
scoped_generator.append(R"~~~(
else
@cpp_name@ = JS::Value(@parameter.optional_default_value@);
)~~~");
} else {
TODO();
}
}
}
} else if (interface.enumerations.contains(parameter.type->name())) {
auto enum_generator = scoped_generator.fork();
auto& enumeration = interface.enumerations.find(parameter.type->name())->value;
StringView enum_member_name;
if (optional_default_value.has_value()) {
VERIFY(optional_default_value->length() >= 2 && (*optional_default_value)[0] == '"' && (*optional_default_value)[optional_default_value->length() - 1] == '"');
enum_member_name = optional_default_value->substring_view(1, optional_default_value->length() - 2);
} else {
enum_member_name = enumeration.first_member;
}
auto default_value_cpp_name = enumeration.translated_cpp_names.get(enum_member_name);
VERIFY(default_value_cpp_name.has_value());
enum_generator.set("enum.default.cpp_value", *default_value_cpp_name);
enum_generator.set("js_name.as_string", String::formatted("{}{}_string", enum_generator.get("js_name"sv), enum_generator.get("js_suffix"sv)));
enum_generator.append(R"~~~(
@parameter.type.name@ @cpp_name@ { @parameter.type.name@::@enum.default.cpp_value@ };
)~~~");
if (optional) {
enum_generator.append(R"~~~(
if (!@js_name@@[email protected]_undefined()) {
)~~~");
}
enum_generator.append(R"~~~(
auto @js_name.as_string@ = TRY(@js_name@@[email protected]_string(vm));
)~~~");
auto first = true;
VERIFY(enumeration.translated_cpp_names.size() >= 1);
for (auto& it : enumeration.translated_cpp_names) {
enum_generator.set("enum.alt.name", it.key);
enum_generator.set("enum.alt.value", it.value);
enum_generator.set("else", first ? "" : "else ");
first = false;
enum_generator.append(R"~~~(
@else@if (@js_name.as_string@ == "@enum.alt.name@"sv)
@cpp_name@ = @parameter.type.name@::@enum.alt.value@;
)~~~");
}
// NOTE: Attribute setters return undefined instead of throwing when the string doesn't match an enum value.
if constexpr (!IsSame<Attribute, RemoveConst<ParameterType>>) {
enum_generator.append(R"~~~(
else
return vm.throw_completion<JS::TypeError>(JS::ErrorType::InvalidEnumerationValue, @js_name.as_string@, "@parameter.type.name@");
)~~~");
} else {
enum_generator.append(R"~~~(
else
return JS::js_undefined();
)~~~");
}
if (optional) {
enum_generator.append(R"~~~(
}
)~~~");
}
} else if (interface.dictionaries.contains(parameter.type->name())) {
if (optional_default_value.has_value() && optional_default_value != "{}")
TODO();
auto dictionary_generator = scoped_generator.fork();
dictionary_generator.append(R"~~~(
if (!@js_name@@[email protected]_nullish() && !@js_name@@[email protected]_object())
return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "@parameter.type.name@");
@parameter.type.name@ @cpp_name@ {};
)~~~");
auto* current_dictionary = &interface.dictionaries.find(parameter.type->name())->value;
while (true) {
for (auto& member : current_dictionary->members) {
dictionary_generator.set("member_key", member.name);
auto member_js_name = make_input_acceptable_cpp(member.name.to_snakecase());
auto member_value_name = String::formatted("{}_value", member_js_name);
auto member_property_value_name = String::formatted("{}_property_value", member_js_name);
dictionary_generator.set("member_name", member_js_name);
dictionary_generator.set("member_value_name", member_value_name);
dictionary_generator.set("member_property_value_name", member_property_value_name);
dictionary_generator.append(R"~~~(
auto @member_property_value_name@ = JS::js_undefined();
if (@js_name@@[email protected]_object())
@member_property_value_name@ = TRY(@js_name@@[email protected]_object().get("@member_key@"));
)~~~");
if (member.required) {
dictionary_generator.append(R"~~~(
if (@[email protected]_undefined())
return vm.throw_completion<JS::TypeError>(JS::ErrorType::MissingRequiredProperty, "@member_key@");
)~~~");
} else if (!member.default_value.has_value()) {
// Assume struct member is Optional<T> and _don't_ assign the generated default
// value (e.g. first enum member) when the dictionary member is optional (i.e.
// no `required` and doesn't have a default value).
// This is needed so that "dictionary has member" checks work as expected.
dictionary_generator.append(R"~~~(
if (!@[email protected]_undefined()) {
)~~~");
}
generate_to_cpp(dictionary_generator, member, member_property_value_name, "", member_value_name, interface, member.extended_attributes.contains("LegacyNullToEmptyString"), !member.required, member.default_value);
dictionary_generator.append(R"~~~(
@cpp_name@.@member_name@ = @member_value_name@;
)~~~");
if (!member.required && !member.default_value.has_value()) {
dictionary_generator.append(R"~~~(
}
)~~~");
}
}
if (current_dictionary->parent_name.is_null())
break;
VERIFY(interface.dictionaries.contains(current_dictionary->parent_name));
current_dictionary = &interface.dictionaries.find(current_dictionary->parent_name)->value;
}
} else if (interface.callback_functions.contains(parameter.type->name())) {
// https://webidl.spec.whatwg.org/#es-callback-function
auto callback_function_generator = scoped_generator.fork();
auto& callback_function = interface.callback_functions.find(parameter.type->name())->value;
// An ECMAScript value V is converted to an IDL callback function type value by running the following algorithm:
// 1. If the result of calling IsCallable(V) is false and the conversion to an IDL value is not being performed due to V being assigned to an attribute whose type is a nullable callback function that is annotated with [LegacyTreatNonObjectAsNull], then throw a TypeError.
if (!callback_function.is_legacy_treat_non_object_as_null) {
callback_function_generator.append(R"~~~(
if (!@js_name@@[email protected]_function())
return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAFunction, @js_name@@[email protected]_string_without_side_effects());
)~~~");
}
// 2. Return the IDL callback function type value that represents a reference to the same object that V represents, with the incumbent settings object as the callback context.
if (callback_function.is_legacy_treat_non_object_as_null) {
callback_function_generator.append(R"~~~(
WebIDL::CallbackType* @cpp_name@ = nullptr;
if (@js_name@@[email protected]_object())
@cpp_name@ = vm.heap().allocate_without_realm<WebIDL::CallbackType>(@js_name@@[email protected]_object(), HTML::incumbent_settings_object());
)~~~");
} else {
callback_function_generator.append(R"~~~(
auto @cpp_name@ = vm.heap().allocate_without_realm<WebIDL::CallbackType>(@js_name@@[email protected]_object(), HTML::incumbent_settings_object());
)~~~");
}
} else if (parameter.type->name() == "sequence") {
// https://webidl.spec.whatwg.org/#es-sequence
auto sequence_generator = scoped_generator.fork();
auto& parameterized_type = verify_cast<IDL::ParameterizedType>(*parameter.type);
sequence_generator.set("recursion_depth", String::number(recursion_depth));
// An ECMAScript value V is converted to an IDL sequence<T> value as follows:
// 1. If Type(V) is not Object, throw a TypeError.
// 2. Let method be ? GetMethod(V, @@iterator).
// 3. If method is undefined, throw a TypeError.
// 4. Return the result of creating a sequence from V and method.
if (optional) {
auto sequence_cpp_type = idl_type_name_to_cpp_type(parameterized_type.parameters().first(), interface);
sequence_generator.set("sequence.type", sequence_cpp_type.name);
sequence_generator.set("sequence.storage_type", sequence_storage_type_to_cpp_storage_type_name(sequence_cpp_type.sequence_storage_type));
if (!optional_default_value.has_value()) {
if (sequence_cpp_type.sequence_storage_type == IDL::SequenceStorageType::Vector) {
sequence_generator.append(R"~~~(
Optional<@sequence.storage_type@<@sequence.type@>> @cpp_name@;
)~~~");
} else {
sequence_generator.append(R"~~~(
Optional<@sequence.storage_type@> @cpp_name@;
)~~~");
}
} else {
if (optional_default_value != "[]")
TODO();
if (sequence_cpp_type.sequence_storage_type == IDL::SequenceStorageType::Vector) {
sequence_generator.append(R"~~~(
@sequence.storage_type@<@sequence.type@> @cpp_name@;
)~~~");
} else {
sequence_generator.append(R"~~~(
@sequence.storage_type@ @cpp_name@ { global_object.heap() };
)~~~");
}
}
sequence_generator.append(R"~~~(
if (!@js_name@@[email protected]_undefined()) {
)~~~");
}
sequence_generator.append(R"~~~(
if (!@js_name@@[email protected]_object())
return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObject, @js_name@@[email protected]_string_without_side_effects());
auto* iterator_method@recursion_depth@ = TRY(@js_name@@[email protected]_method(vm, *vm.well_known_symbol_iterator()));
if (!iterator_method@recursion_depth@)
return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotIterable, @js_name@@[email protected]_string_without_side_effects());
)~~~");
parameterized_type.generate_sequence_from_iterable(sequence_generator, String::formatted("{}{}", acceptable_cpp_name, optional ? "_non_optional" : ""), String::formatted("{}{}", js_name, js_suffix), String::formatted("iterator_method{}", recursion_depth), interface, recursion_depth + 1);
if (optional) {
sequence_generator.append(R"~~~(
@cpp_name@ = move(@cpp_name@_non_optional);
}
)~~~");
}
} else if (parameter.type->name() == "record") {
// https://webidl.spec.whatwg.org/#es-record
auto record_generator = scoped_generator.fork();
auto& parameterized_type = verify_cast<IDL::ParameterizedType>(*parameter.type);
record_generator.set("recursion_depth", String::number(recursion_depth));
// A record can only have two types: key type and value type.
VERIFY(parameterized_type.parameters().size() == 2);
// A record only allows the key to be a string.
VERIFY(parameterized_type.parameters()[0].is_string());
// An ECMAScript value O is converted to an IDL record<K, V> value as follows:
// 1. If Type(O) is not Object, throw a TypeError.
// 2. Let result be a new empty instance of record<K, V>.
// 3. Let keys be ? O.[[OwnPropertyKeys]]().
// 4. For each key of keys:
// 1. Let desc be ? O.[[GetOwnProperty]](key).
// 2. If desc is not undefined and desc.[[Enumerable]] is true:
// 1. Let typedKey be key converted to an IDL value of type K.
// 2. Let value be ? Get(O, key).
// 3. Let typedValue be value converted to an IDL value of type V.
// 4. Set result[typedKey] to typedValue.
// 5. Return result.
auto record_cpp_type = IDL::idl_type_name_to_cpp_type(parameterized_type, interface);
record_generator.set("record.type", record_cpp_type.name);
// If this is a recursive call to generate_to_cpp, assume that the caller has already handled converting the JS value to an object for us.
// This affects record types in unions for example.
if (recursion_depth == 0) {
record_generator.append(R"~~~(
if (!@js_name@@[email protected]_object())
return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObject, @js_name@@[email protected]_string_without_side_effects());
auto& @js_name@@js_suffix@_object = @js_name@@[email protected]_object();
)~~~");
}
record_generator.append(R"~~~(
@record.type@ @cpp_name@;
auto record_keys@recursion_depth@ = TRY(@js_name@@js_suffix@_object.internal_own_property_keys());
for (auto& key@recursion_depth@ : record_keys@recursion_depth@) {
auto property_key@recursion_depth@ = MUST(JS::PropertyKey::from_value(vm, key@recursion_depth@));
auto descriptor@recursion_depth@ = TRY(@js_name@@js_suffix@_object.internal_get_own_property(property_key@recursion_depth@));
if (!descriptor@[email protected]_value() || !descriptor@recursion_depth@->enumerable.has_value() || !descriptor@recursion_depth@->enumerable.value())
continue;
)~~~");
IDL::Parameter key_parameter { .type = parameterized_type.parameters()[0], .name = acceptable_cpp_name, .optional_default_value = {}, .extended_attributes = {} };
generate_to_cpp(record_generator, key_parameter, "key", String::number(recursion_depth), String::formatted("typed_key{}", recursion_depth), interface, false, false, {}, false, recursion_depth + 1);
record_generator.append(R"~~~(
auto value@recursion_depth@ = TRY(@js_name@@js_suffix@_object.get(property_key@recursion_depth@));
)~~~");
// FIXME: Record value types should be TypeWithExtendedAttributes, which would allow us to get [LegacyNullToEmptyString] here.
IDL::Parameter value_parameter { .type = parameterized_type.parameters()[1], .name = acceptable_cpp_name, .optional_default_value = {}, .extended_attributes = {} };
generate_to_cpp(record_generator, value_parameter, "value", String::number(recursion_depth), String::formatted("typed_value{}", recursion_depth), interface, false, false, {}, false, recursion_depth + 1);
record_generator.append(R"~~~(
@[email protected](typed_key@recursion_depth@, typed_value@recursion_depth@);
}
)~~~");
} else if (is<IDL::UnionType>(*parameter.type)) {
// https://webidl.spec.whatwg.org/#es-union
auto union_generator = scoped_generator.fork();
auto& union_type = verify_cast<IDL::UnionType>(*parameter.type);
union_generator.set("union_type", union_type_to_variant(union_type, interface));
union_generator.set("recursion_depth", String::number(recursion_depth));
// NOTE: This is handled out here as we need the dictionary conversion code for the {} optional default value.
// 3. Let types be the flattened member types of the union type.
auto types = union_type.flattened_member_types();
RefPtr<Type> dictionary_type;
for (auto& dictionary : interface.dictionaries) {
for (auto& type : types) {
if (type.name() == dictionary.key) {
dictionary_type = type;
break;
}
}
if (dictionary_type)
break;
}
if (dictionary_type) {
auto dictionary_generator = union_generator.fork();
dictionary_generator.set("dictionary.type", dictionary_type->name());
// The lambda must take the JS::Value to convert as a parameter instead of capturing it in order to support union types being variadic.
dictionary_generator.append(R"~~~(
auto @js_name@@js_suffix@_to_dictionary = [&vm](JS::Value @js_name@@js_suffix@) -> JS::ThrowCompletionOr<@dictionary.type@> {
)~~~");
IDL::Parameter dictionary_parameter { .type = *dictionary_type, .name = acceptable_cpp_name, .optional_default_value = {}, .extended_attributes = {} };
generate_to_cpp(dictionary_generator, dictionary_parameter, js_name, js_suffix, "dictionary_union_type"sv, interface, false, false, {}, false, recursion_depth + 1);
dictionary_generator.append(R"~~~(
return dictionary_union_type;
};
)~~~");
}
// A lambda is used because Variants without "Empty" can't easily be default initialized.
// Plus, this would require the user of union types to always accept a Variant with an Empty type.
// Additionally, it handles the case of unconditionally throwing a TypeError at the end if none of the types match.
// This is because we cannot unconditionally throw in generate_to_cpp as generate_to_cpp is supposed to assign to a variable and then continue.
// Note that all the other types only throw on a condition.
// The lambda must take the JS::Value to convert as a parameter instead of capturing it in order to support union types being variadic.
StringBuilder to_variant_captures;
to_variant_captures.append("&vm, &realm"sv);
if (dictionary_type)
to_variant_captures.append(String::formatted(", &{}{}_to_dictionary", js_name, js_suffix));
union_generator.set("to_variant_captures", to_variant_captures.to_string());
union_generator.append(R"~~~(
auto @js_name@@js_suffix@_to_variant = [@to_variant_captures@](JS::Value @js_name@@js_suffix@) -> JS::ThrowCompletionOr<@union_type@> {
// These might be unused.
(void)vm;
(void)realm;
)~~~");
// 1. If the union type includes undefined and V is undefined, then return the unique undefined value.
if (union_type.includes_undefined()) {
scoped_generator.append(R"~~~(
if (@js_name@@[email protected]_undefined())
return Empty {};
)~~~");
}
// FIXME: 2. If the union type includes a nullable type and V is null or undefined, then return the IDL value null.
if (union_type.includes_nullable_type()) {
// Implement me
} else if (dictionary_type) {
// 4. If V is null or undefined, then
// 4.1 If types includes a dictionary type, then return the result of converting V to that dictionary type.
union_generator.append(R"~~~(
if (@js_name@@[email protected]_nullish())
return @union_type@ { TRY(@js_name@@js_suffix@_to_dictionary(@js_name@@js_suffix@)) };
)~~~");
}
bool includes_object = false;
for (auto& type : types) {
if (type.name() == "object") {
includes_object = true;
break;
}
}
// FIXME: Don't generate this if the union type doesn't include any object types.
union_generator.append(R"~~~(
if (@js_name@@[email protected]_object()) {
[[maybe_unused]] auto& @js_name@@js_suffix@_object = @js_name@@[email protected]_object();
)~~~");
bool includes_platform_object = false;
for (auto& type : types) {
if (IDL::is_platform_object(type)) {
includes_platform_object = true;
break;
}
}
if (includes_platform_object) {
// 5. If V is a platform object, then:
union_generator.append(R"~~~(
if (is<PlatformObject>(@js_name@@js_suffix@_object)) {
)~~~");
// NOTE: This codegen assumes that all union types are cells or values we can create a handle for.
// 1. If types includes an interface type that V implements, then return the IDL value that is a reference to the object V.
for (auto& type : types) {
if (!IDL::is_platform_object(type))
continue;
auto union_platform_object_type_generator = union_generator.fork();
union_platform_object_type_generator.set("platform_object_type", type.name());
union_platform_object_type_generator.append(R"~~~(
if (is<@platform_object_type@>(@js_name@@js_suffix@_object))
return JS::make_handle(static_cast<@platform_object_type@&>(@js_name@@js_suffix@_object));
)~~~");
}
// 2. If types includes object, then return the IDL value that is a reference to the object V.
if (includes_object) {
union_generator.append(R"~~~(
return JS::make_handle(@js_name@@js_suffix@_object);
)~~~");
}
union_generator.append(R"~~~(
}
)~~~");
}
// 6. If Type(V) is Object and V has an [[ArrayBufferData]] internal slot, then
// 1. If types includes ArrayBuffer, then return the result of converting V to ArrayBuffer.
for (auto& type : types) {
if (type.name() == "BufferSource") {
union_generator.append(R"~~~(
if (is<JS::ArrayBuffer>(@js_name@@js_suffix@_object))
return JS::make_handle(@js_name@@js_suffix@_object);
)~~~");
}
}
// 2. If types includes object, then return the IDL value that is a reference to the object V.
if (includes_object) {
union_generator.append(R"~~~(
return @js_name@@js_suffix@_object;
)~~~");
}
// FIXME: 7. If Type(V) is Object and V has a [[DataView]] internal slot, then:
// 1. If types includes DataView, then return the result of converting V to DataView.
// 2. If types includes object, then return the IDL value that is a reference to the object V.