mirror of
https://github.com/RGBCube/serenity
synced 2025-10-31 13:12:46 +00:00
adbb8d62d1
These changes are arbitrarily divided into multiple commits to make it easier to find potentially introduced bugs with git bisect.
598 lines
24 KiB
C++
598 lines
24 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 <AK/QuickSort.h>
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#include <LibWeb/CSS/Parser/CSSParser.h>
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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 <ctype.h>
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#include <stdio.h>
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namespace Web::CSS {
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StyleResolver::StyleResolver(DOM::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::ParsingContext(), css).leak_ref();
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}
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return *sheet;
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}
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static StyleSheet& quirks_mode_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 quirks_mode_stylesheet_source[];
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String css = quirks_mode_stylesheet_source;
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sheet = parse_css(CSS::ParsingContext(), 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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if (document().in_quirks_mode())
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callback(quirks_mode_stylesheet());
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for (auto& sheet : document().style_sheets().sheets()) {
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callback(sheet);
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}
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}
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Vector<MatchingRule> StyleResolver::collect_matching_rules(const DOM::Element& element) const
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{
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Vector<MatchingRule> matching_rules;
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size_t style_sheet_index = 0;
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for_each_stylesheet([&](auto& sheet) {
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size_t rule_index = 0;
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for (auto& rule : sheet.rules()) {
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size_t selector_index = 0;
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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, style_sheet_index, rule_index, selector_index });
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break;
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}
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++selector_index;
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}
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++rule_index;
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}
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++style_sheet_index;
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});
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return matching_rules;
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}
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void StyleResolver::sort_matching_rules(Vector<MatchingRule>& matching_rules) const
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{
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quick_sort(matching_rules, [&](MatchingRule& a, MatchingRule& b) {
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auto& a_selector = a.rule->selectors()[a.selector_index];
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auto& b_selector = b.rule->selectors()[b.selector_index];
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auto a_specificity = a_selector.specificity();
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auto b_specificity = b_selector.specificity();
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if (a_selector.specificity() == b_selector.specificity()) {
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if (a.style_sheet_index == b.style_sheet_index)
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return a.rule_index < b.rule_index;
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return a.style_sheet_index < b.style_sheet_index;
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}
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return a_specificity < b_specificity;
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});
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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::TextDecorationLine);
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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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enum class Edge {
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Top,
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Right,
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Bottom,
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Left,
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All,
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};
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static bool contains(Edge a, Edge b)
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{
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return a == b || b == Edge::All;
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}
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static inline void set_property_border_width(StyleProperties& style, const StyleValue& value, Edge edge)
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{
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ASSERT(value.is_length());
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if (contains(Edge::Top, edge))
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style.set_property(CSS::PropertyID::BorderTopWidth, value);
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if (contains(Edge::Right, edge))
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style.set_property(CSS::PropertyID::BorderRightWidth, value);
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if (contains(Edge::Bottom, edge))
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style.set_property(CSS::PropertyID::BorderBottomWidth, value);
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if (contains(Edge::Left, edge))
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style.set_property(CSS::PropertyID::BorderLeftWidth, value);
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}
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static inline void set_property_border_color(StyleProperties& style, const StyleValue& value, Edge edge)
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{
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ASSERT(value.is_color());
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if (contains(Edge::Top, edge))
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style.set_property(CSS::PropertyID::BorderTopColor, value);
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if (contains(Edge::Right, edge))
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style.set_property(CSS::PropertyID::BorderRightColor, value);
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if (contains(Edge::Bottom, edge))
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style.set_property(CSS::PropertyID::BorderBottomColor, value);
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if (contains(Edge::Left, edge))
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style.set_property(CSS::PropertyID::BorderLeftColor, value);
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}
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static inline void set_property_border_style(StyleProperties& style, const StyleValue& value, Edge edge)
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{
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ASSERT(value.is_string());
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if (contains(Edge::Top, edge))
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style.set_property(CSS::PropertyID::BorderTopStyle, value);
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if (contains(Edge::Right, edge))
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style.set_property(CSS::PropertyID::BorderRightStyle, value);
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if (contains(Edge::Bottom, edge))
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style.set_property(CSS::PropertyID::BorderBottomStyle, value);
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if (contains(Edge::Left, edge))
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style.set_property(CSS::PropertyID::BorderLeftStyle, value);
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}
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static void set_property_expanding_shorthands(StyleProperties& style, CSS::PropertyID property_id, const StyleValue& value, DOM::Document& document)
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{
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CSS::ParsingContext context(document);
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if (property_id == CSS::PropertyID::TextDecoration) {
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switch (value.to_identifier()) {
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case CSS::ValueID::None:
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case CSS::ValueID::Underline:
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case CSS::ValueID::Overline:
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case CSS::ValueID::LineThrough:
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case CSS::ValueID::Blink:
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set_property_expanding_shorthands(style, CSS::PropertyID::TextDecorationLine, value, document);
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default:
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break;
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}
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return;
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}
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if (property_id == CSS::PropertyID::Border) {
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set_property_expanding_shorthands(style, CSS::PropertyID::BorderTop, value, document);
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set_property_expanding_shorthands(style, CSS::PropertyID::BorderRight, value, document);
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set_property_expanding_shorthands(style, CSS::PropertyID::BorderBottom, value, document);
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set_property_expanding_shorthands(style, CSS::PropertyID::BorderLeft, value, document);
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return;
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}
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if (property_id == CSS::PropertyID::BorderTop
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|| property_id == CSS::PropertyID::BorderRight
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|| property_id == CSS::PropertyID::BorderBottom
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|| property_id == CSS::PropertyID::BorderLeft) {
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Edge edge = Edge::All;
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switch (property_id) {
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case CSS::PropertyID::BorderTop:
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edge = Edge::Top;
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break;
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case CSS::PropertyID::BorderRight:
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edge = Edge::Right;
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break;
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case CSS::PropertyID::BorderBottom:
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edge = Edge::Bottom;
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break;
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case CSS::PropertyID::BorderLeft:
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edge = Edge::Left;
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break;
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default:
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break;
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}
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auto parts = split_on_whitespace(value.to_string());
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if (value.is_length()) {
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set_property_border_width(style, value, edge);
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return;
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}
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if (value.is_color()) {
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set_property_border_color(style, value, edge);
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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() == 1) {
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if (auto value = parse_line_style(context, parts[0])) {
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set_property_border_style(style, value.release_nonnull(), edge);
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set_property_border_color(style, ColorStyleValue::create(Gfx::Color::Black), edge);
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set_property_border_width(style, LengthStyleValue::create(Length(3, Length::Type::Px)), edge);
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return;
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}
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}
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RefPtr<LengthStyleValue> line_width_value;
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RefPtr<ColorStyleValue> color_value;
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RefPtr<StringStyleValue> line_style_value;
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for (auto& part : parts) {
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if (auto value = parse_line_width(context, part)) {
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if (line_width_value)
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return;
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line_width_value = move(value);
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continue;
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}
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if (auto value = parse_color(context, part)) {
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if (color_value)
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return;
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color_value = move(value);
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continue;
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}
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if (auto value = parse_line_style(context, part)) {
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if (line_style_value)
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return;
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line_style_value = move(value);
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continue;
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}
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}
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if (line_width_value)
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set_property_border_width(style, line_width_value.release_nonnull(), edge);
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if (color_value)
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set_property_border_color(style, color_value.release_nonnull(), edge);
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if (line_style_value)
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set_property_border_style(style, line_style_value.release_nonnull(), edge);
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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::BorderStyle) {
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auto parts = split_on_whitespace(value.to_string());
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if (value.is_string() && parts.size() == 3) {
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auto top = parse_css_value(context, parts[0]);
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auto right = parse_css_value(context, parts[1]);
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auto bottom = parse_css_value(context, parts[2]);
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auto left = parse_css_value(context, parts[1]);
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if (top && right && bottom && left) {
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style.set_property(CSS::PropertyID::BorderTopStyle, *top);
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style.set_property(CSS::PropertyID::BorderRightStyle, *right);
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style.set_property(CSS::PropertyID::BorderBottomStyle, *bottom);
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style.set_property(CSS::PropertyID::BorderLeftStyle, *left);
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}
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} else {
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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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}
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return;
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}
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if (property_id == CSS::PropertyID::BorderWidth) {
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auto parts = split_on_whitespace(value.to_string());
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if (value.is_string() && parts.size() == 2) {
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auto vertical_border_width = parse_css_value(context, parts[0]);
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auto horizontal_border_width = parse_css_value(context, parts[1]);
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if (vertical_border_width && horizontal_border_width) {
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style.set_property(CSS::PropertyID::BorderTopWidth, *vertical_border_width);
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style.set_property(CSS::PropertyID::BorderRightWidth, *horizontal_border_width);
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style.set_property(CSS::PropertyID::BorderBottomWidth, *vertical_border_width);
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style.set_property(CSS::PropertyID::BorderLeftWidth, *horizontal_border_width);
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}
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} else {
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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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}
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return;
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}
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if (property_id == CSS::PropertyID::BorderColor) {
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auto parts = split_on_whitespace(value.to_string());
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if (value.is_string() && parts.size() == 4) {
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auto top = parse_css_value(context, parts[0]);
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auto right = parse_css_value(context, parts[1]);
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auto bottom = parse_css_value(context, parts[2]);
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auto left = parse_css_value(context, parts[3]);
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if (top && right && bottom && left) {
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style.set_property(CSS::PropertyID::BorderTopColor, *top);
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style.set_property(CSS::PropertyID::BorderRightColor, *right);
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style.set_property(CSS::PropertyID::BorderBottomColor, *bottom);
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style.set_property(CSS::PropertyID::BorderLeftColor, *left);
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}
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} else {
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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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}
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return;
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}
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if (property_id == CSS::PropertyID::Background) {
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if (value.is_identifier() && static_cast<const IdentifierStyleValue&>(value).id() == CSS::ValueID::None) {
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style.set_property(CSS::PropertyID::BackgroundColor, ColorStyleValue::create(Color::Transparent));
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return;
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}
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auto parts = split_on_whitespace(value.to_string());
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NonnullRefPtrVector<StyleValue> values;
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for (auto& part : parts) {
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auto value = parse_css_value(context, part);
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if (!value)
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return;
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values.append(value.release_nonnull());
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}
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// HACK: Disallow more than one color value in a 'background' shorthand
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size_t color_value_count = 0;
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for (auto& value : values)
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color_value_count += value.is_color();
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if (values[0].is_color() && color_value_count == 1)
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style.set_property(CSS::PropertyID::BackgroundColor, values[0]);
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for (auto& value : values) {
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if (!value.is_string())
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continue;
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auto string = value.to_string();
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set_property_expanding_shorthands(style, CSS::PropertyID::BackgroundImage, value, document);
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}
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return;
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}
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if (property_id == CSS::PropertyID::BackgroundImage) {
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if (!value.is_string())
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return;
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auto string = value.to_string();
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if (!string.starts_with("url("))
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return;
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if (!string.ends_with(')'))
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return;
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auto url = string.substring_view(4, string.length() - 5);
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if (url.length() >= 2 && url.starts_with('"') && url.ends_with('"'))
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url = url.substring_view(1, url.length() - 2);
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else if (url.length() >= 2 && url.starts_with('\'') && url.ends_with('\''))
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url = url.substring_view(1, url.length() - 2);
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auto background_image_value = ImageStyleValue::create(document.complete_url(url), document);
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style.set_property(CSS::PropertyID::BackgroundImage, move(background_image_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 (value.is_string() && parts.size() == 2) {
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auto vertical = parse_css_value(context, parts[0]);
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auto horizontal = parse_css_value(context, parts[1]);
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if (vertical && horizontal) {
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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);
|
|
}
|
|
return;
|
|
}
|
|
if (value.is_string() && parts.size() == 3) {
|
|
auto top = parse_css_value(context, parts[0]);
|
|
auto horizontal = parse_css_value(context, parts[1]);
|
|
auto bottom = parse_css_value(context, parts[2]);
|
|
if (top && horizontal && bottom) {
|
|
style.set_property(CSS::PropertyID::MarginTop, *top);
|
|
style.set_property(CSS::PropertyID::MarginBottom, *bottom);
|
|
style.set_property(CSS::PropertyID::MarginLeft, *horizontal);
|
|
style.set_property(CSS::PropertyID::MarginRight, *horizontal);
|
|
}
|
|
return;
|
|
}
|
|
if (value.is_string() && parts.size() == 4) {
|
|
auto top = parse_css_value(context, parts[0]);
|
|
auto right = parse_css_value(context, parts[1]);
|
|
auto bottom = parse_css_value(context, parts[2]);
|
|
auto left = parse_css_value(context, parts[3]);
|
|
if (top && right && bottom && left) {
|
|
style.set_property(CSS::PropertyID::MarginTop, *top);
|
|
style.set_property(CSS::PropertyID::MarginBottom, *bottom);
|
|
style.set_property(CSS::PropertyID::MarginLeft, *left);
|
|
style.set_property(CSS::PropertyID::MarginRight, *right);
|
|
}
|
|
return;
|
|
}
|
|
dbgln("Unsure what to do with CSS margin value '{}'", value.to_string());
|
|
return;
|
|
}
|
|
return;
|
|
}
|
|
|
|
if (property_id == CSS::PropertyID::Padding) {
|
|
if (value.is_length()) {
|
|
style.set_property(CSS::PropertyID::PaddingTop, value);
|
|
style.set_property(CSS::PropertyID::PaddingRight, value);
|
|
style.set_property(CSS::PropertyID::PaddingBottom, value);
|
|
style.set_property(CSS::PropertyID::PaddingLeft, value);
|
|
return;
|
|
}
|
|
if (value.is_string()) {
|
|
auto parts = split_on_whitespace(value.to_string());
|
|
if (value.is_string() && parts.size() == 2) {
|
|
auto vertical = parse_css_value(context, parts[0]);
|
|
auto horizontal = parse_css_value(context, parts[1]);
|
|
if (vertical && horizontal) {
|
|
style.set_property(CSS::PropertyID::PaddingTop, *vertical);
|
|
style.set_property(CSS::PropertyID::PaddingBottom, *vertical);
|
|
style.set_property(CSS::PropertyID::PaddingLeft, *horizontal);
|
|
style.set_property(CSS::PropertyID::PaddingRight, *horizontal);
|
|
}
|
|
return;
|
|
}
|
|
if (value.is_string() && parts.size() == 3) {
|
|
auto top = parse_css_value(context, parts[0]);
|
|
auto horizontal = parse_css_value(context, parts[1]);
|
|
auto bottom = parse_css_value(context, parts[2]);
|
|
if (top && bottom && horizontal) {
|
|
style.set_property(CSS::PropertyID::PaddingTop, *top);
|
|
style.set_property(CSS::PropertyID::PaddingBottom, *bottom);
|
|
style.set_property(CSS::PropertyID::PaddingLeft, *horizontal);
|
|
style.set_property(CSS::PropertyID::PaddingRight, *horizontal);
|
|
}
|
|
return;
|
|
}
|
|
if (value.is_string() && parts.size() == 4) {
|
|
auto top = parse_css_value(context, parts[0]);
|
|
auto right = parse_css_value(context, parts[1]);
|
|
auto bottom = parse_css_value(context, parts[2]);
|
|
auto left = parse_css_value(context, parts[3]);
|
|
if (top && bottom && left && right) {
|
|
style.set_property(CSS::PropertyID::PaddingTop, *top);
|
|
style.set_property(CSS::PropertyID::PaddingBottom, *bottom);
|
|
style.set_property(CSS::PropertyID::PaddingLeft, *left);
|
|
style.set_property(CSS::PropertyID::PaddingRight, *right);
|
|
}
|
|
return;
|
|
}
|
|
dbgln("Unsure what to do with CSS padding value '{}'", value.to_string());
|
|
return;
|
|
}
|
|
return;
|
|
}
|
|
|
|
if (property_id == CSS::PropertyID::ListStyle) {
|
|
auto parts = split_on_whitespace(value.to_string());
|
|
if (!parts.is_empty()) {
|
|
auto value = parse_css_value(context, parts[0]);
|
|
if (!value)
|
|
return;
|
|
style.set_property(CSS::PropertyID::ListStyleType, value.release_nonnull());
|
|
}
|
|
return;
|
|
}
|
|
|
|
style.set_property(property_id, value);
|
|
}
|
|
|
|
NonnullRefPtr<StyleProperties> StyleResolver::resolve_style(const DOM::Element& element) const
|
|
{
|
|
auto style = StyleProperties::create();
|
|
|
|
if (auto* parent_style = element.parent_element() ? element.parent_element()->specified_css_values() : nullptr) {
|
|
parent_style->for_each_property([&](auto property_id, auto& value) {
|
|
if (is_inherited_property(property_id))
|
|
set_property_expanding_shorthands(style, property_id, value, m_document);
|
|
});
|
|
}
|
|
|
|
element.apply_presentational_hints(*style);
|
|
|
|
auto matching_rules = collect_matching_rules(element);
|
|
sort_matching_rules(matching_rules);
|
|
|
|
for (auto& match : matching_rules) {
|
|
for (auto& property : match.rule->declaration().properties()) {
|
|
set_property_expanding_shorthands(style, property.property_id, property.value, m_document);
|
|
}
|
|
}
|
|
|
|
if (auto* inline_style = element.inline_style()) {
|
|
for (auto& property : inline_style->properties()) {
|
|
set_property_expanding_shorthands(style, property.property_id, property.value, m_document);
|
|
}
|
|
}
|
|
|
|
return style;
|
|
}
|
|
|
|
}
|