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ladybird/Libraries/LibWeb/CodeGenerators/WrapperGenerator.cpp

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LibWeb: Start generating JS wrappers from (simplified) WebIDL :^) This patch introduces a hackish but functional IDL parser and uses it to generate the JS bindings for Node and Document. We'll see how far this simple parser takes us. The important thing right now is generating code, not being a perfect IDL parser. :^)
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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <AK/ByteBuffer.h>
#include <AK/StringBuilder.h>
#include <LibCore/ArgsParser.h>
#include <LibCore/File.h>
#include <ctype.h>
LibWeb+LibJS: Add a naive way to check if a wrapper "is" a certain type Instead of only checking the class_name(), we now generate an is_foo() virtual in the wrapper generator. (It's currently something we override on Bindings::Wrapper, which is not really scalable.) Longer term we'll need to think up something smarter for verifying that one wrapper "is" another type of wrapper.
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static String snake_name(const StringView& title_name)
LibWeb: Start generating JS wrappers from (simplified) WebIDL :^) This patch introduces a hackish but functional IDL parser and uses it to generate the JS bindings for Node and Document. We'll see how far this simple parser takes us. The important thing right now is generating code, not being a perfect IDL parser. :^)
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{
StringBuilder builder;
LibWeb+LibJS: Add a naive way to check if a wrapper "is" a certain type Instead of only checking the class_name(), we now generate an is_foo() virtual in the wrapper generator. (It's currently something we override on Bindings::Wrapper, which is not really scalable.) Longer term we'll need to think up something smarter for verifying that one wrapper "is" another type of wrapper.
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bool first = true;
for (auto ch : title_name) {
LibWeb: Start generating JS wrappers from (simplified) WebIDL :^) This patch introduces a hackish but functional IDL parser and uses it to generate the JS bindings for Node and Document. We'll see how far this simple parser takes us. The important thing right now is generating code, not being a perfect IDL parser. :^)
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if (isupper(ch)) {
LibWeb+LibJS: Add a naive way to check if a wrapper "is" a certain type Instead of only checking the class_name(), we now generate an is_foo() virtual in the wrapper generator. (It's currently something we override on Bindings::Wrapper, which is not really scalable.) Longer term we'll need to think up something smarter for verifying that one wrapper "is" another type of wrapper.
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if (!first)
builder.append('_');
LibWeb: Start generating JS wrappers from (simplified) WebIDL :^) This patch introduces a hackish but functional IDL parser and uses it to generate the JS bindings for Node and Document. We'll see how far this simple parser takes us. The important thing right now is generating code, not being a perfect IDL parser. :^)
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builder.append(tolower(ch));
} else {
builder.append(ch);
}
LibWeb+LibJS: Add a naive way to check if a wrapper "is" a certain type Instead of only checking the class_name(), we now generate an is_foo() virtual in the wrapper generator. (It's currently something we override on Bindings::Wrapper, which is not really scalable.) Longer term we'll need to think up something smarter for verifying that one wrapper "is" another type of wrapper.
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first = false;
LibWeb: Start generating JS wrappers from (simplified) WebIDL :^) This patch introduces a hackish but functional IDL parser and uses it to generate the JS bindings for Node and Document. We'll see how far this simple parser takes us. The important thing right now is generating code, not being a perfect IDL parser. :^)
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}
return builder.to_string();
}
namespace IDL {
struct Type {
String name;
bool nullable { false };
};
struct Parameter {
Type type;
String name;
};
struct Function {
Type return_type;
String name;
Vector<Parameter> parameters;
size_t length() const
{
// FIXME: Take optional arguments into account
return parameters.size();
}
};
struct Attribute {
bool readonly { false };
Type type;
String name;
// Added for convenience after parsing
String getter_callback_name;
String setter_callback_name;
};
struct Interface {
String name;
String parent_name;
Vector<Attribute> attributes;
Vector<Function> functions;
// Added for convenience after parsing
String wrapper_class;
String wrapper_base_class;
};
static String snake_name(const StringView& camel_name)
{
StringBuilder builder;
for (auto ch : camel_name) {
if (isupper(ch)) {
builder.append('_');
builder.append(tolower(ch));
} else {
builder.append(ch);
}
}
return builder.to_string();
}
OwnPtr<Interface> parse_interface(const StringView& input)
{
auto interface = make<Interface>();
size_t index = 0;
auto peek = [&](size_t offset = 0) -> char {
if (index + offset > input.length())
return 0;
return input[index + offset];
};
auto consume = [&] {
return input[index++];
};
auto consume_if = [&](auto ch) {
if (peek() == ch) {
consume();
return true;
}
return false;
};
auto consume_specific = [&](char ch) {
auto consumed = consume();
if (consumed != ch) {
dbg() << "Expected '" << ch << "' at offset " << index << " but got '" << consumed << "'";
ASSERT_NOT_REACHED();
}
};
auto consume_whitespace = [&] {
while (isspace(peek()))
consume();
};
auto consume_string = [&](const StringView& string) {
for (size_t i = 0; i < string.length(); ++i) {
ASSERT(consume() == string[i]);
}
};
auto next_is = [&](const StringView& string) {
for (size_t i = 0; i < string.length(); ++i) {
if (peek(i) != string[i])
return false;
}
return true;
};
auto consume_while = [&](auto condition) {
StringBuilder builder;
while (index < input.length() && condition(peek())) {
builder.append(consume());
}
return builder.to_string();
};
consume_string("interface");
consume_whitespace();
interface->name = consume_while([](auto ch) { return !isspace(ch); });
consume_whitespace();
if (consume_if(':')) {
consume_whitespace();
interface->parent_name = consume_while([](auto ch) { return !isspace(ch); });
consume_whitespace();
}
consume_specific('{');
auto parse_type = [&] {
auto name = consume_while([](auto ch) { return !isspace(ch) && ch != '?'; });
auto nullable = peek() == '?';
if (nullable)
consume_specific('?');
return Type { name, nullable };
};
auto parse_attribute = [&] {
bool readonly = false;
if (next_is("readonly")) {
consume_string("readonly");
readonly = true;
consume_whitespace();
}
if (next_is("attribute")) {
consume_string("attribute");
consume_whitespace();
}
auto type = parse_type();
consume_whitespace();
auto name = consume_while([](auto ch) { return !isspace(ch) && ch != ';'; });
consume_specific(';');
Attribute attribute;
attribute.readonly = readonly;
attribute.type = type;
attribute.name = name;
attribute.getter_callback_name = String::format("%s_getter", snake_name(attribute.name).characters());
attribute.setter_callback_name = String::format("%s_setter", snake_name(attribute.name).characters());
interface->attributes.append(move(attribute));
};
auto parse_function = [&] {
auto return_type = parse_type();
consume_whitespace();
auto name = consume_while([](auto ch) { return !isspace(ch) && ch != '('; });
consume_specific('(');
Vector<Parameter> parameters;
for (;;) {
auto type = parse_type();
consume_whitespace();
auto name = consume_while([](auto ch) { return !isspace(ch) && ch != ',' && ch != ')'; });
parameters.append({ move(type), move(name) });
if (consume_if(')'))
break;
consume_specific(',');
consume_whitespace();
}
consume_specific(';');
interface->functions.append(Function { return_type, name, move(parameters) });
};
for (;;) {
consume_whitespace();
if (consume_if('}'))
break;
if (next_is("readonly") || next_is("attribute")) {
parse_attribute();
continue;
}
parse_function();
}
interface->wrapper_class = String::format("%sWrapper", interface->name.characters());
interface->wrapper_base_class = String::format("%sWrapper", interface->parent_name.characters());
return interface;
}
}
static void generate_header(const IDL::Interface&);
static void generate_implementation(const IDL::Interface&);
int main(int argc, char** argv)
{
Core::ArgsParser args_parser;
const char* path = nullptr;
bool header_mode = false;
bool implementation_mode = false;
args_parser.add_option(header_mode, "Generate the wrapper .h file", "header", 'H');
args_parser.add_option(implementation_mode, "Generate the wrapper .cpp file", "implementation", 'I');
args_parser.add_positional_argument(path, "IDL file", "idl-file");
args_parser.parse(argc, argv);
auto file_or_error = Core::File::open(path, Core::IODevice::ReadOnly);
if (file_or_error.is_error()) {
fprintf(stderr, "Cannot open %s\n", path);
return 1;
}
auto data = file_or_error.value()->read_all();
auto interface = IDL::parse_interface(data);
if (!interface) {
fprintf(stderr, "Cannot parse %s\n", path);
return 1;
}
#if 0
dbg() << "Attributes:";
for (auto& attribute : interface->attributes) {
dbg() << " " << (attribute.readonly ? "Readonly " : "")
<< attribute.type.name << (attribute.type.nullable ? "?" : "")
<< " " << attribute.name;
}
dbg() << "Functions:";
for (auto& function : interface->functions) {
dbg() << " " << function.return_type.name << (function.return_type.nullable ? "?" : "")
<< " " << function.name;
for (auto& parameter : function.parameters) {
dbg() << " " << parameter.type.name << (parameter.type.nullable ? "?" : "") << " " << parameter.name;
}
}
#endif
if (header_mode)
generate_header(*interface);
if (implementation_mode)
generate_implementation(*interface);
return 0;
}
static void generate_header(const IDL::Interface& interface)
{
auto& wrapper_class = interface.wrapper_class;
auto& wrapper_base_class = interface.wrapper_base_class;
out() << "#pragma once";
out() << "#include <LibWeb/Bindings/Wrapper.h>";
out() << "#include <LibWeb/DOM/" << interface.name << ".h>";
if (!wrapper_base_class.is_empty()) {
out() << "#include <LibWeb/Bindings/" << wrapper_base_class << ".h>";
}
out() << "namespace Web {";
out() << "namespace Bindings {";
out() << "class " << wrapper_class << " : public " << wrapper_base_class << " {";
out() << "public:";
out() << " " << wrapper_class << "(JS::GlobalObject&, " << interface.name << "&);";
out() << " virtual void initialize(JS::Interpreter&, JS::GlobalObject&) override;";
out() << " virtual ~" << wrapper_class << "() override;";
if (wrapper_base_class.is_empty()) {
out() << " " << interface.name << "& impl() { return *m_impl; }";
out() << " const " << interface.name << "& impl() const { return *m_impl; }";
} else {
out() << " " << interface.name << "& impl() { return static_cast<" << interface.name << "&>(" << wrapper_base_class << "::impl()); }";
out() << " const " << interface.name << "& impl() const { return static_cast<const " << interface.name << "&>(" << wrapper_base_class << "::impl()); }";
}
LibWeb+LibJS: Add a naive way to check if a wrapper "is" a certain type Instead of only checking the class_name(), we now generate an is_foo() virtual in the wrapper generator. (It's currently something we override on Bindings::Wrapper, which is not really scalable.) Longer term we'll need to think up something smarter for verifying that one wrapper "is" another type of wrapper.
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auto is_foo_wrapper_name = snake_name(String::format("Is%s", wrapper_class.characters()));
out() << " virtual bool " << is_foo_wrapper_name << "() const final { return true; }";
LibWeb: Start generating JS wrappers from (simplified) WebIDL :^) This patch introduces a hackish but functional IDL parser and uses it to generate the JS bindings for Node and Document. We'll see how far this simple parser takes us. The important thing right now is generating code, not being a perfect IDL parser. :^)
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out() << "private:";
out() << " virtual const char* class_name() const override { return \"" << interface.name << "\"; }";
for (auto& function : interface.functions) {
out() << " JS_DECLARE_NATIVE_FUNCTION(" << snake_name(function.name) << ");";
}
for (auto& attribute : interface.attributes) {
out() << " JS_DECLARE_NATIVE_GETTER(" << snake_name(attribute.name) << "_getter);";
if (!attribute.readonly)
out() << " JS_DECLARE_NATIVE_SETTER(" << snake_name(attribute.name) << "_setter);";
}
out() << "};";
out() << "}";
out() << "}";
}
void generate_implementation(const IDL::Interface& interface)
{
auto& wrapper_class = interface.wrapper_class;
auto& wrapper_base_class = interface.wrapper_base_class;
out() << "#include <AK/FlyString.h>";
out() << "#include <LibJS/Interpreter.h>";
out() << "#include <LibJS/Runtime/Array.h>";
out() << "#include <LibJS/Runtime/Value.h>";
out() << "#include <LibJS/Runtime/GlobalObject.h>";
out() << "#include <LibJS/Runtime/Error.h>";
out() << "#include <LibWeb/Bindings/NodeWrapperFactory.h>";
out() << "#include <LibWeb/Bindings/" << wrapper_class << ".h>";
out() << "#include <LibWeb/DOM/Element.h>";
LibWeb: Expose Document.body to the web Also, make it return a HTMLElement since Document.body should actually return the frameset element in a frame-based document.
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out() << "#include <LibWeb/DOM/HTMLElement.h>";
LibWeb: Start generating JS wrappers from (simplified) WebIDL :^) This patch introduces a hackish but functional IDL parser and uses it to generate the JS bindings for Node and Document. We'll see how far this simple parser takes us. The important thing right now is generating code, not being a perfect IDL parser. :^)
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out() << "namespace Web {";
out() << "namespace Bindings {";
// Implementation: Wrapper constructor
out() << wrapper_class << "::" << wrapper_class << "(JS::GlobalObject& global_object, " << interface.name << "& impl)";
out() << " : " << wrapper_base_class << "(global_object, impl)";
out() << "{";
out() << "}";
// Implementation: Wrapper initialize()
out() << "void " << wrapper_class << "::initialize(JS::Interpreter& interpreter, JS::GlobalObject& global_object)";
out() << "{";
out() << " [[maybe_unused]] u8 default_attributes = JS::Attribute::Enumerable | JS::Attribute::Configurable;";
out() << " " << wrapper_base_class << "::initialize(interpreter, global_object);";
for (auto& attribute : interface.attributes) {
out() << " define_native_property(\"" << attribute.name << "\", " << attribute.getter_callback_name << ", " << (attribute.readonly ? "nullptr" : attribute.setter_callback_name) << ", default_attributes);";
}
for (auto& function : interface.functions) {
out() << " define_native_function(\"" << function.name << "\", " << snake_name(function.name) << ", " << function.length() << ", default_attributes);";
}
out() << "}";
// Implementation: Wrapper destructor
out() << wrapper_class << "::~" << wrapper_class << "()";
out() << "{";
out() << "}";
// Implementation: impl_from()
out() << "static " << interface.name << "* impl_from(JS::Interpreter& interpreter, JS::GlobalObject& global_object)";
out() << "{";
out() << " auto* this_object = interpreter.this_value(global_object).to_object(interpreter, global_object);";
out() << " if (!this_object)";
out() << " return {};";
LibWeb+LibJS: Add a naive way to check if a wrapper "is" a certain type Instead of only checking the class_name(), we now generate an is_foo() virtual in the wrapper generator. (It's currently something we override on Bindings::Wrapper, which is not really scalable.) Longer term we'll need to think up something smarter for verifying that one wrapper "is" another type of wrapper.
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auto is_foo_wrapper_name = snake_name(String::format("Is%s", wrapper_class.characters()));
out() << " if (!this_object->is_web_wrapper() || !static_cast<Wrapper*>(this_object)->" << is_foo_wrapper_name << "()) {";
LibWeb: Start generating JS wrappers from (simplified) WebIDL :^) This patch introduces a hackish but functional IDL parser and uses it to generate the JS bindings for Node and Document. We'll see how far this simple parser takes us. The important thing right now is generating code, not being a perfect IDL parser. :^)
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out() << " interpreter.throw_exception<JS::TypeError>(JS::ErrorType::NotA, \"" << interface.name << "\");";
out() << " return nullptr;";
out() << " }";
out() << " return &static_cast<" << wrapper_class << "*>(this_object)->impl();";
out() << "}";
auto generate_return_statement = [&](auto& return_type) {
if (return_type.nullable) {
out() << " if (!retval)";
out() << " return JS::js_null();";
}
if (return_type.name == "DOMString") {
out() << " return JS::js_string(interpreter, retval);";
} else if (return_type.name == "ArrayFromVector") {
// FIXME: Remove this fake type hack once it's no longer needed.
// Basically once we have NodeList we can throw this out.
out() << " auto* new_array = JS::Array::create(global_object);";
out() << " for (auto& element : retval) {";
out() << " new_array->indexed_properties().append(wrap(interpreter.heap(), element));";
out() << " }";
out() << " return new_array;";
} else {
out() << " return wrap(interpreter.heap(), const_cast<" << return_type.name << "&>(*retval));";
}
};
// Implementation: Attributes
for (auto& attribute : interface.attributes) {
out() << "JS_DEFINE_NATIVE_GETTER(" << wrapper_class << "::" << snake_name(attribute.name) << "_getter)";
out() << "{";
out() << " auto* impl = impl_from(interpreter, global_object);";
out() << " if (!impl)";
out() << " return {};";
out() << " auto retval = impl->" << snake_name(attribute.name) << "();";
generate_return_statement(attribute.type);
out() << "}";
}
// Implementation: Functions
for (auto& function : interface.functions) {
out() << "JS_DEFINE_NATIVE_FUNCTION(" << wrapper_class << "::" << snake_name(function.name) << ")";
out() << "{";
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() << "\");";
Vector<String> parameter_names;
size_t argument_index = 0;
for (auto& parameter : function.parameters) {
LibWeb: Fix missing snake_case-ificiation of function parameter names
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parameter_names.append(snake_name(parameter.name));
LibWeb: Start generating JS wrappers from (simplified) WebIDL :^) This patch introduces a hackish but functional IDL parser and uses it to generate the JS bindings for Node and Document. We'll see how far this simple parser takes us. The important thing right now is generating code, not being a perfect IDL parser. :^)
2020-06-20 22:09:38 +02:00
if (parameter.type.name == "DOMString") {
out() << " auto " << snake_name(parameter.name) << " = interpreter.argument(" << argument_index << ").to_string(interpreter);";
out() << " if (interpreter.exception())";
out() << " return {};";
LibWeb: Expose Node.appendChild() to the web This is a very barebones implementation of appendChild() that doesn't take any of the idiosyncratic DOM behaviors into account yet. Also teach the wrapper generator how to turn an Interpreter argument into a Node&.
2020-06-21 01:00:58 +02:00
} else if (parameter.type.name == "Node") {
out() << " auto " << snake_name(parameter.name) << "_object = interpreter.argument(" << argument_index << ").to_object(interpreter, global_object);";
out() << " if (interpreter.exception())";
out() << " return {};";
out() << " if (!" << snake_name(parameter.name) << "_object->is_web_wrapper() || !static_cast<Wrapper*>(" << snake_name(parameter.name) << "_object)->is_node_wrapper())";
out() << " return interpreter.throw_exception<JS::TypeError>(JS::ErrorType::NotA, \"" << parameter.type.name << "\");";
out() << " auto& " << snake_name(parameter.name) << " = static_cast<" << wrapper_class << "*>(" << snake_name(parameter.name) << "_object)->impl();";
LibWeb: Start generating JS wrappers from (simplified) WebIDL :^) This patch introduces a hackish but functional IDL parser and uses it to generate the JS bindings for Node and Document. We'll see how far this simple parser takes us. The important thing right now is generating code, not being a perfect IDL parser. :^)
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}
++argument_index;
}
StringBuilder arguments_builder;
arguments_builder.join(", ", parameter_names);
if (function.return_type.name != "void") {
out() << " auto retval = impl->" << snake_name(function.name) << "(" << arguments_builder.to_string() << ");";
} else {
out() << " impl->" << snake_name(function.name) << "(" << arguments_builder.to_string() << ");";
}
generate_return_statement(function.return_type);
out() << "}";
}
out() << "}";
out() << "}";
}
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