ladybird/Userland/Libraries/LibWeb/HTML/Scripting/ImportMapParseResult.cpp

/*
 * Copyright (c) 2024, Jamie Mansfield <jmansfield@cadixdev.org>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#include <LibJS/Runtime/ModuleRequest.h>
#include <LibWeb/HTML/Scripting/ExceptionReporter.h>
#include <LibWeb/HTML/Scripting/ImportMapParseResult.h>
#include <LibWeb/HTML/Window.h>
#include <LibWeb/WebIDL/DOMException.h>

namespace Web::HTML {

JS_DEFINE_ALLOCATOR(ImportMapParseResult);

ImportMapParseResult::ImportMapParseResult() = default;

ImportMapParseResult::~ImportMapParseResult() = default;

// https://html.spec.whatwg.org/multipage/webappapis.html#create-an-import-map-parse-result
JS::NonnullGCPtr<ImportMapParseResult> ImportMapParseResult::create(JS::Realm& realm, ByteString const& input, URL::URL base_url)
{
    // 1. Let result be an import map parse result whose import map is null and whose error to rethrow is null.
    auto result = realm.heap().allocate<ImportMapParseResult>(realm);
    result->set_error_to_rethrow(JS::js_null());

    // 2. Parse an import map string given input and baseURL, catching any exceptions.
    auto import_map = parse_import_map_string(realm, input, base_url);

    // 2.1. If this threw an exception, then set result's error to rethrow to that exception.
    // FIXME: rethrow the original exception
    if (import_map.is_exception())
        result->set_error_to_rethrow(JS::Error::create(realm, "Failed to parse import map string"sv));

    // 2.2. Otherwise, set result's import map to the return value.
    else
        result->set_import_map(import_map.release_value());

    // 3. Return result.
    return result;
}

void ImportMapParseResult::visit_host_defined_self(JS::Cell::Visitor& visitor)
{
    visitor.visit(*this);
}

void ImportMapParseResult::visit_edges(Visitor& visitor)
{
    Base::visit_edges(visitor);
    visitor.visit(m_error_to_rethrow);
}

// https://html.spec.whatwg.org/multipage/webappapis.html#register-an-import-map
void ImportMapParseResult::register_import_map(Window& global)
{
    // 1. If result's error to rethrow is not null, then report the exception given by result's error to rethrow and return.
    if (!m_error_to_rethrow.is_null()) {
        HTML::report_exception(m_error_to_rethrow, global.realm());
        return;
    }

    // 2. Assert: global's import map is an empty import map.
    VERIFY(global.import_map().imports().is_empty() && global.import_map().scopes().is_empty());

    // 3. Set global's import map to result's import map.
    VERIFY(m_import_map.has_value());
    global.set_import_map(m_import_map.value());
}

}