830a57c6b2
Let's rename this to LibWeb since it aims to provide more parts of the web platform than just HTML. :^)
300 lines
12 KiB
C++
300 lines
12 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <LibWeb/CSS/SelectorEngine.h>
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#include <LibWeb/CSS/StyleResolver.h>
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#include <LibWeb/CSS/StyleSheet.h>
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#include <LibWeb/DOM/Document.h>
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#include <LibWeb/DOM/Element.h>
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#include <LibWeb/Dump.h>
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#include <LibWeb/Parser/CSSParser.h>
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#include <ctype.h>
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#include <stdio.h>
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namespace Web {
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StyleResolver::StyleResolver(Document& document)
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: m_document(document)
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{
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}
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StyleResolver::~StyleResolver()
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{
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}
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static StyleSheet& default_stylesheet()
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{
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static StyleSheet* sheet;
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if (!sheet) {
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extern const char default_stylesheet_source[];
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String css = default_stylesheet_source;
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sheet = parse_css(css).leak_ref();
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}
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return *sheet;
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}
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template<typename Callback>
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void StyleResolver::for_each_stylesheet(Callback callback) const
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{
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callback(default_stylesheet());
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for (auto& sheet : document().stylesheets()) {
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callback(sheet);
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}
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}
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NonnullRefPtrVector<StyleRule> StyleResolver::collect_matching_rules(const Element& element) const
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{
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NonnullRefPtrVector<StyleRule> matching_rules;
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for_each_stylesheet([&](auto& sheet) {
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for (auto& rule : sheet.rules()) {
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for (auto& selector : rule.selectors()) {
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if (SelectorEngine::matches(selector, element)) {
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matching_rules.append(rule);
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break;
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}
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}
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}
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});
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#ifdef HTML_DEBUG
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dbgprintf("Rules matching Element{%p}\n", &element);
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for (auto& rule : matching_rules) {
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dump_rule(rule);
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}
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#endif
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return matching_rules;
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}
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bool StyleResolver::is_inherited_property(CSS::PropertyID property_id)
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{
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static HashTable<CSS::PropertyID> inherited_properties;
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if (inherited_properties.is_empty()) {
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inherited_properties.set(CSS::PropertyID::BorderCollapse);
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inherited_properties.set(CSS::PropertyID::BorderSpacing);
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inherited_properties.set(CSS::PropertyID::Color);
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inherited_properties.set(CSS::PropertyID::FontFamily);
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inherited_properties.set(CSS::PropertyID::FontSize);
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inherited_properties.set(CSS::PropertyID::FontStyle);
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inherited_properties.set(CSS::PropertyID::FontVariant);
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inherited_properties.set(CSS::PropertyID::FontWeight);
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inherited_properties.set(CSS::PropertyID::LetterSpacing);
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inherited_properties.set(CSS::PropertyID::LineHeight);
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inherited_properties.set(CSS::PropertyID::ListStyle);
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inherited_properties.set(CSS::PropertyID::ListStyleImage);
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inherited_properties.set(CSS::PropertyID::ListStylePosition);
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inherited_properties.set(CSS::PropertyID::ListStyleType);
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inherited_properties.set(CSS::PropertyID::TextAlign);
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inherited_properties.set(CSS::PropertyID::TextIndent);
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inherited_properties.set(CSS::PropertyID::TextTransform);
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inherited_properties.set(CSS::PropertyID::Visibility);
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inherited_properties.set(CSS::PropertyID::WhiteSpace);
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inherited_properties.set(CSS::PropertyID::WordSpacing);
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// FIXME: This property is not supposed to be inherited, but we currently
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// rely on inheritance to propagate decorations into line boxes.
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inherited_properties.set(CSS::PropertyID::TextDecoration);
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}
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return inherited_properties.contains(property_id);
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}
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static Vector<String> split_on_whitespace(const StringView& string)
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{
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if (string.is_empty())
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return {};
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Vector<String> v;
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size_t substart = 0;
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for (size_t i = 0; i < string.length(); ++i) {
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char ch = string.characters_without_null_termination()[i];
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if (isspace(ch)) {
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size_t sublen = i - substart;
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if (sublen != 0)
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v.append(string.substring_view(substart, sublen));
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substart = i + 1;
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}
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}
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size_t taillen = string.length() - substart;
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if (taillen != 0)
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v.append(string.substring_view(substart, taillen));
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return v;
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}
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static void set_property_expanding_shorthands(StyleProperties& style, CSS::PropertyID property_id, const StyleValue& value)
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{
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if (property_id == CSS::PropertyID::BorderStyle) {
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style.set_property(CSS::PropertyID::BorderTopStyle, value);
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style.set_property(CSS::PropertyID::BorderRightStyle, value);
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style.set_property(CSS::PropertyID::BorderBottomStyle, value);
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style.set_property(CSS::PropertyID::BorderLeftStyle, value);
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return;
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}
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if (property_id == CSS::PropertyID::BorderWidth) {
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style.set_property(CSS::PropertyID::BorderTopWidth, value);
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style.set_property(CSS::PropertyID::BorderRightWidth, value);
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style.set_property(CSS::PropertyID::BorderBottomWidth, value);
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style.set_property(CSS::PropertyID::BorderLeftWidth, value);
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return;
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}
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if (property_id == CSS::PropertyID::BorderColor) {
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style.set_property(CSS::PropertyID::BorderTopColor, value);
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style.set_property(CSS::PropertyID::BorderRightColor, value);
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style.set_property(CSS::PropertyID::BorderBottomColor, value);
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style.set_property(CSS::PropertyID::BorderLeftColor, value);
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return;
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}
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if (property_id == CSS::PropertyID::Margin) {
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if (value.is_length()) {
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style.set_property(CSS::PropertyID::MarginTop, value);
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style.set_property(CSS::PropertyID::MarginRight, value);
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style.set_property(CSS::PropertyID::MarginBottom, value);
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style.set_property(CSS::PropertyID::MarginLeft, value);
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return;
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}
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if (value.is_string()) {
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auto parts = split_on_whitespace(value.to_string());
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if (parts.size() == 2) {
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auto vertical = parse_css_value(parts[0]);
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auto horizontal = parse_css_value(parts[1]);
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style.set_property(CSS::PropertyID::MarginTop, vertical);
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style.set_property(CSS::PropertyID::MarginBottom, vertical);
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style.set_property(CSS::PropertyID::MarginLeft, horizontal);
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style.set_property(CSS::PropertyID::MarginRight, horizontal);
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return;
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}
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if (parts.size() == 3) {
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auto top = parse_css_value(parts[0]);
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auto horizontal = parse_css_value(parts[1]);
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auto bottom = parse_css_value(parts[2]);
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style.set_property(CSS::PropertyID::MarginTop, top);
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style.set_property(CSS::PropertyID::MarginBottom, bottom);
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style.set_property(CSS::PropertyID::MarginLeft, horizontal);
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style.set_property(CSS::PropertyID::MarginRight, horizontal);
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return;
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}
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if (parts.size() == 4) {
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auto top = parse_css_value(parts[0]);
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auto right = parse_css_value(parts[1]);
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auto bottom = parse_css_value(parts[2]);
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auto left = parse_css_value(parts[3]);
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style.set_property(CSS::PropertyID::MarginTop, top);
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style.set_property(CSS::PropertyID::MarginBottom, bottom);
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style.set_property(CSS::PropertyID::MarginLeft, left);
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style.set_property(CSS::PropertyID::MarginRight, right);
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return;
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}
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dbg() << "Unsure what to do with CSS margin value '" << value.to_string() << "'";
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return;
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}
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return;
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}
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if (property_id == CSS::PropertyID::Padding) {
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if (value.is_length()) {
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style.set_property(CSS::PropertyID::PaddingTop, value);
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style.set_property(CSS::PropertyID::PaddingRight, value);
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style.set_property(CSS::PropertyID::PaddingBottom, value);
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style.set_property(CSS::PropertyID::PaddingLeft, value);
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return;
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}
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if (value.is_string()) {
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auto parts = split_on_whitespace(value.to_string());
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if (parts.size() == 2) {
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auto vertical = parse_css_value(parts[0]);
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auto horizontal = parse_css_value(parts[1]);
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style.set_property(CSS::PropertyID::PaddingTop, vertical);
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style.set_property(CSS::PropertyID::PaddingBottom, vertical);
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style.set_property(CSS::PropertyID::PaddingLeft, horizontal);
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style.set_property(CSS::PropertyID::PaddingRight, horizontal);
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return;
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}
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if (parts.size() == 3) {
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auto top = parse_css_value(parts[0]);
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auto horizontal = parse_css_value(parts[1]);
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auto bottom = parse_css_value(parts[2]);
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style.set_property(CSS::PropertyID::PaddingTop, top);
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style.set_property(CSS::PropertyID::PaddingBottom, bottom);
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style.set_property(CSS::PropertyID::PaddingLeft, horizontal);
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style.set_property(CSS::PropertyID::PaddingRight, horizontal);
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return;
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}
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if (parts.size() == 4) {
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auto top = parse_css_value(parts[0]);
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auto right = parse_css_value(parts[1]);
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auto bottom = parse_css_value(parts[2]);
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auto left = parse_css_value(parts[3]);
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style.set_property(CSS::PropertyID::PaddingTop, top);
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style.set_property(CSS::PropertyID::PaddingBottom, bottom);
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style.set_property(CSS::PropertyID::PaddingLeft, left);
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style.set_property(CSS::PropertyID::PaddingRight, right);
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return;
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}
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dbg() << "Unsure what to do with CSS padding value '" << value.to_string() << "'";
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return;
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}
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return;
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}
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style.set_property(property_id, value);
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}
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NonnullRefPtr<StyleProperties> StyleResolver::resolve_style(const Element& element, const StyleProperties* parent_style) const
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{
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auto style = StyleProperties::create();
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if (parent_style) {
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parent_style->for_each_property([&](auto property_id, auto& value) {
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if (is_inherited_property(property_id))
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set_property_expanding_shorthands(style, property_id, value);
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});
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}
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element.apply_presentational_hints(*style);
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auto matching_rules = collect_matching_rules(element);
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for (auto& rule : matching_rules) {
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for (auto& property : rule.declaration().properties()) {
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set_property_expanding_shorthands(style, property.property_id, property.value);
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}
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}
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auto style_attribute = element.attribute("style");
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if (!style_attribute.is_null()) {
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if (auto declaration = parse_css_declaration(style_attribute)) {
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for (auto& property : declaration->properties()) {
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set_property_expanding_shorthands(style, property.property_id, property.value);
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}
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}
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}
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return style;
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}
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}
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