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LibWeb: Generate some metadata about transform functions

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This will be used to parse and validate their parameters.
This commit is contained in:
Sam Atkins 2022-04-17 16:56:52 +01:00 • committed by Andreas Kling
parent 61ad39b110
commit 42d87239a8
Notes: sideshowbarker 2024-07-17 11:42:51 +09:00
1 changed files with 74 additions and 0 deletions
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74
Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSTransformFunctions.cpp
View file

@ -5,6 +5,7 @@
*/
#include "GeneratorUtil.h"
#include <AK/GenericLexer.h>
#include <AK/SourceGenerator.h>
#include <AK/StringBuilder.h>
#include <LibCore/ArgsParser.h>
@ -73,6 +74,21 @@ namespace Web::CSS {
generator.appendln("Optional<TransformFunction> transform_function_from_string(StringView);");
generator.appendln("StringView to_string(TransformFunction);");
generator.append(R"~~~(
enum class TransformFunctionParameterType {
Angle,
LengthPercentage,
Number,
};
struct TransformFunctionMetadata {
size_t min_parameters;
size_t max_parameters;
TransformFunctionParameterType parameter_type;
};
TransformFunctionMetadata transform_function_metadata(TransformFunction);
)~~~");
generator.appendln("\n}");
TRY(file.write(generator.as_string_view().bytes()));
@ -128,6 +144,64 @@ StringView to_string(TransformFunction transform_function)
VERIFY_NOT_REACHED();
}
}
)~~~");
generator.append(R"~~~(
TransformFunctionMetadata transform_function_metadata(TransformFunction transform_function)
{
switch (transform_function) {
)~~~");
transforms_data.for_each_member([&](auto& name, auto& value) {
VERIFY(value.is_object());
auto parameters_string = value.as_object().get("parameters").as_string();
GenericLexer lexer { parameters_string };
VERIFY(lexer.consume_specific('<'));
auto parameter_type_name = lexer.consume_until('>');
VERIFY(lexer.consume_specific('>'));
StringView parameter_type = ""sv;
if (parameter_type_name == "angle"sv)
parameter_type = "Angle"sv;
else if (parameter_type_name == "length-percentage"sv)
parameter_type = "LengthPercentage"sv;
else if (parameter_type_name == "number"sv)
parameter_type = "Number"sv;
else
VERIFY_NOT_REACHED();
StringView min_parameters = "1"sv;
StringView max_parameters = "1"sv;
if (!lexer.is_eof()) {
VERIFY(lexer.consume_specific('{'));
min_parameters = lexer.consume_until([](auto c) { return c == ',' || c == '}'; });
if (lexer.consume_specific(','))
max_parameters = lexer.consume_until('}');
else
max_parameters = min_parameters;
VERIFY(lexer.consume_specific('}'));
}
VERIFY(lexer.is_eof());
auto member_generator = generator.fork();
member_generator.set("name:titlecase", title_casify_transform_function(name));
member_generator.set("min_parameters", min_parameters);
member_generator.set("max_parameters", max_parameters);
member_generator.set("parameter_type", parameter_type);
member_generator.append(R"~~~(
case TransformFunction::@name:titlecase@:
return TransformFunctionMetadata {
.min_parameters = @min_parameters@,
.max_parameters = @max_parameters@,
.parameter_type = TransformFunctionParameterType::@parameter_type@
};
)~~~");
});
generator.append(R"~~~(
default:
VERIFY_NOT_REACHED();
}
}
)~~~");
generator.appendln("\n}");