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LibWeb: Add support for generating FlyString parameters from IDL

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We would previously always generate string parameters to pass through
to functions as a `String`. This works fine if the argument is a
`FlyString const&`, but falls apart for optional types where we need to
accept an `Optional<FlyString> const&`.

Support this by implementing a [FlyString] extended attribute which
if present results in the parameter for the function being generated
as a FlyString.
This commit is contained in:
Shannon Booth 2024-01-02 23:38:55 +13:00 committed by Andreas Kling
parent f32185420d
commit 8ba3caf6ab
Notes: sideshowbarker 2024-07-16 23:57:20 +09:00 
Author: https://github.com/shannonbooth
Commit: https://github.com/SerenityOS/serenity/commit/8ba3caf6ab
Pull-request: https://github.com/SerenityOS/serenity/pull/22539
1 changed files with 10 additions and 8 deletions
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18
Meta/Lagom/Tools/CodeGenerators/LibWeb/BindingsGenerator/IDLGenerators.cpp
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@ -4,7 +4,7 @@
* Copyright (c) 2021-2023, Luke Wilde <lukew@serenityos.org>
* Copyright (c) 2022, Ali Mohammad Pur <mpfard@serenityos.org>
* Copyright (c) 2023, Kenneth Myhra <kennethmyhra@serenityos.org>
* Copyright (c) 2023, Shannon Booth <shannon@serenityos.org>
* Copyright (c) 2023-2024, Shannon Booth <shannon@serenityos.org>
* Copyright (c) 2023, Matthew Olsson <mattco@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
@ -321,14 +321,14 @@ static void generate_to_string(SourceGenerator& scoped_generator, ParameterType
} else if (!optional) {
if (!parameter.type->is_nullable()) {
scoped_generator.append(R"~~~(
String @cpp_name@;
@string_type@ @cpp_name@;
if (!@legacy_null_to_empty_string@ || !@js_name@@js_suffix@.is_null()) {
@cpp_name@ = TRY(@js_name@@js_suffix@.to_string(vm));
}
)~~~");
} else {
scoped_generator.append(R"~~~(
Optional<String> @cpp_name@;
Optional<@string_type@> @cpp_name@;
if (!@js_name@@js_suffix@.is_nullish())
@cpp_name@ = TRY(@js_name@@js_suffix@.to_string(vm));
)~~~");
@ -337,11 +337,11 @@ static void generate_to_string(SourceGenerator& scoped_generator, ParameterType
bool may_be_null = !optional_default_value.has_value() || parameter.type->is_nullable() || optional_default_value.value() == "null";
if (may_be_null) {
scoped_generator.append(R"~~~(
Optional<String> @cpp_name@;
Optional<@string_type@> @cpp_name@;
)~~~");
} else {
scoped_generator.append(R"~~~(
String @cpp_name@;
@string_type@ @cpp_name@;
)~~~");
}
@ -352,7 +352,7 @@ static void generate_to_string(SourceGenerator& scoped_generator, ParameterType
})~~~");
if (!may_be_null) {
scoped_generator.append(R"~~~( else {
@cpp_name@ = MUST(String::from_utf8(@parameter.optional_default_value@sv));
@cpp_name@ = MUST(@string_type@::from_utf8(@parameter.optional_default_value@sv));
}
)~~~");
} else {
@ -363,7 +363,7 @@ static void generate_to_string(SourceGenerator& scoped_generator, ParameterType
}
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)
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)
{
auto scoped_generator = generator.fork();
auto acceptable_cpp_name = make_input_acceptable_cpp(cpp_name);
@ -371,6 +371,7 @@ 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());
if (optional_default_value.has_value())
@ -1532,7 +1533,8 @@ static void generate_arguments(SourceGenerator& generator, Vector<IDL::Parameter
}
bool legacy_null_to_empty_string = parameter.extended_attributes.contains("LegacyNullToEmptyString");
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);
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);
++argument_index;
}