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LibWeb: Generate CanvasRenderingContext2D bindings from IDL :^)

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We're still missing optional argument support, so this implementation
doesn't support fill(), only fill(fill_rule).

Still it's really nice to get rid of so much hand-written wrapper code.
This commit is contained in:
Andreas Kling 2020-06-22 18:39:22 +02:00
parent f361d25ec8
commit 9ce25bbf1d
8 changed files with 84 additions and 505 deletions
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37
Libraries/LibWeb/CodeGenerators/WrapperGenerator.cpp
View file

@ -214,6 +214,8 @@ OwnPtr<Interface> parse_interface(const StringView& input)
Vector<Parameter> parameters;
for (;;) {
if (consume_if(')'))
break;
auto type = parse_type();
consume_whitespace();
auto name = consume_while([](auto ch) { return !isspace(ch) && ch != ',' && ch != ')'; });
@ -327,6 +329,23 @@ static bool should_emit_wrapper_factory(const IDL::Interface& interface)
return true;
}
static bool is_wrappable_type(const IDL::Type& type)
{
if (type.name == "Node")
return true;
if (type.name == "Document")
return true;
if (type.name == "Text")
return true;
if (type.name == "DocumentType")
return true;
if (type.name.ends_with("Element"))
return true;
if (type.name == "ImageData")
return true;
return false;
}
static void generate_header(const IDL::Interface& interface)
{
auto& wrapper_class = interface.wrapper_class;
@ -404,6 +423,9 @@ void generate_implementation(const IDL::Interface& interface)
out() << "#include <LibWeb/DOM/Element.h>";
out() << "#include <LibWeb/DOM/HTMLElement.h>";
out() << "#include <LibWeb/DOM/EventListener.h>";
out() << "#include <LibWeb/Bindings/HTMLCanvasElementWrapper.h>";
out() << "#include <LibWeb/Bindings/HTMLImageElementWrapper.h>";
out() << "#include <LibWeb/Bindings/ImageDataWrapper.h>";
out() << "#include <LibWeb/Bindings/CanvasRenderingContext2DWrapper.h>";
out() << "namespace Web {";
@ -473,7 +495,7 @@ void generate_implementation(const IDL::Interface& interface)
generate_return();
out() << " }";
out() << " auto " << cpp_name << " = adopt(*new EventListener(JS::make_handle(&" << js_name << js_suffix << ".as_function())));";
} else if (parameter.type.name == "Node") {
} else if (is_wrappable_type(parameter.type)) {
out() << " auto " << cpp_name << "_object = " << js_name << js_suffix << ".to_object(interpreter, global_object);";
out() << " if (interpreter.exception())";
generate_return();
@ -482,6 +504,13 @@ void generate_implementation(const IDL::Interface& interface)
generate_return();
out() << " }";
out() << " auto& " << cpp_name << " = static_cast<" << parameter.type.name << "Wrapper*>(" << cpp_name << "_object)->impl();";
} else if (parameter.type.name == "double") {
out() << " auto " << cpp_name << " = " << js_name << js_suffix << ".to_double(interpreter);";
out() << " if (interpreter.exception())";
generate_return();
} else {
dbg() << "Unimplemented JS-to-C++ conversion: " << parameter.type.name;
ASSERT_NOT_REACHED();
}
};
@ -564,8 +593,10 @@ void generate_implementation(const IDL::Interface& interface)
out() << " auto* impl = impl_from(interpreter, global_object);";
out() << " if (!impl)";
out() << " return {};";
out() << " if (interpreter.argument_count() < " << function.length() << ")";
out() << " return interpreter.throw_exception<JS::TypeError>(JS::ErrorType::BadArgCountMany, \"" << function.name << "\", \"" << function.length() << "\");";
if (function.length() > 0) {
out() << " if (interpreter.argument_count() < " << function.length() << ")";
out() << " return interpreter.throw_exception<JS::TypeError>(JS::ErrorType::BadArgCountMany, \"" << function.name << "\", \"" << function.length() << "\");";
}
StringBuilder arguments_builder;
generate_arguments(function.parameters, arguments_builder);