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LibWeb: Don't always assign values to nullable IDL dictionary members

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IDL dictionary members are nullable by default (unless marked as
`required`) and should not get any value assigned unless one was
provided by the userland code that isn't undefined, or if the member has
a default value.

This is so that we can use Optional<T> in the internal representation
and check for "is present" via Optional::has_value().
This commit is contained in:
Linus Groh 2022-09-25 15:40:17 +01:00
parent d38f1fb5b2
commit b9d626d6b2
Notes: sideshowbarker 2024-07-19 01:59:31 +09:00 
Author: https://github.com/linusg
Commit: https://github.com/SerenityOS/serenity/commit/b9d626d6b2
Pull-request: https://github.com/SerenityOS/serenity/pull/15359
Reviewed-by: https://github.com/alimpfard
Reviewed-by: https://github.com/davidot ✅
Reviewed-by: https://github.com/kennethmyhra
1 changed files with 22 additions and 10 deletions
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32
Meta/Lagom/Tools/CodeGenerators/LibWeb/BindingsGenerator/IDLGenerators.cpp
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@ -631,28 +631,40 @@ static void generate_to_cpp(SourceGenerator& generator, ParameterType& parameter
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"~~~(
JS::Value @member_name@;
if (@js_name@@js_suffix@.is_nullish()) {
@member_name@ = JS::js_undefined();
} else {
@member_name@ = TRY(@js_name@@js_suffix@.as_object().get("@member_key@"));
}
auto @member_property_value_name@ = JS::js_undefined();
if (@js_name@@js_suffix@.is_object())
@member_property_value_name@ = TRY(@js_name@@js_suffix@.as_object().get("@member_key@"));
)~~~");
if (member.required) {
dictionary_generator.append(R"~~~(
if (@member_name@.is_undefined())
if (@member_property_value_name@.is_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 (!@member_property_value_name@.is_undefined()) {
)~~~");
}
auto member_value_name = String::formatted("{}_value", member_js_name);
dictionary_generator.set("member_value_name", member_value_name);
generate_to_cpp(dictionary_generator, member, member_js_name, "", member_value_name, interface, member.extended_attributes.contains("LegacyNullToEmptyString"), !member.required, member.default_value);
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;