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LibWeb: Add actual document loading for the CSS (at)import rule

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Sviatoslav Peleshko 2021-02-21 18:44:17 +02:00 • committed by Andreas Kling
parent 54617e1a91
commit 183ebaee91
11 changed files with 229 additions and 56 deletions
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111
Userland/Libraries/LibWeb/Loader/CSSLoader.cpp Normal file
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/*
* Copyright (c) 2021, the SerenityOS developers.
* 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/Debug.h>
#include <AK/URL.h>
#include <LibWeb/CSS/CSSImportRule.h>
#include <LibWeb/CSS/Parser/CSSParser.h>
#include <LibWeb/CSS/StyleSheet.h>
#include <LibWeb/Loader/CSSLoader.h>
#include <LibWeb/Loader/ResourceLoader.h>
namespace Web {
CSSLoader::CSSLoader(DOM::Document& document)
: m_document(&document)
{
}
void CSSLoader::load_from_text(const String& text)
{
m_style_sheet = parse_css(CSS::ParsingContext(*m_document), text);
if (!m_style_sheet)
m_style_sheet = CSS::StyleSheet::create({});
load_next_import_if_needed();
}
void CSSLoader::load_from_url(const URL& url)
{
m_style_sheet = CSS::StyleSheet::create({});
LoadRequest request;
request.set_url(url);
set_resource(ResourceLoader::the().load_resource(Resource::Type::Generic, request));
}
void CSSLoader::resource_did_load()
{
VERIFY(resource());
if (!resource()->has_encoded_data()) {
dbgln_if(CSS_LOADER_DEBUG, "CSSLoader: Resource did load, no encoded data. URL: {}", resource()->url());
} else {
dbgln_if(CSS_LOADER_DEBUG, "CSSLoader: Resource did load, has encoded data. URL: {}", resource()->url());
}
auto sheet = parse_css(CSS::ParsingContext(*m_document), resource()->encoded_data());
if (!sheet) {
dbgln_if(CSS_LOADER_DEBUG, "CSSLoader: Failed to parse stylesheet: {}", resource()->url());
return;
}
bool was_imported = m_style_sheet->for_first_not_loaded_import_rule([&](auto& rule) {
rule.set_style_sheet(sheet);
});
// Transfer the rules from the successfully parsed sheet into the sheet we've already inserted.
if (!was_imported) {
m_style_sheet->rules() = sheet->rules();
}
if (on_load)
on_load();
load_next_import_if_needed();
}
void CSSLoader::resource_did_fail()
{
dbgln_if(CSS_LOADER_DEBUG, "CSSLoader: Resource did fail. URL: {}", resource()->url());
load_next_import_if_needed();
}
void CSSLoader::load_next_import_if_needed()
{
// Create load request for the first import which isn't loaded.
// TODO: We need to somehow handle infinite cycles in imports.
m_style_sheet->for_first_not_loaded_import_rule([&](auto& rule) {
dbgln_if(CSS_LOADER_DEBUG, "CSSLoader: Loading @import {}", rule.url());
LoadRequest request;
request.set_url(rule.url());
set_resource(ResourceLoader::the().load_resource(Resource::Type::Generic, request));
});
}
}