94ca55cefd
As suggested by Joshua, this commit adds the 2-clause BSD license as a comment block to the top of every source file. For the first pass, I've just added myself for simplicity. I encourage everyone to add themselves as copyright holders of any file they've added or modified in some significant way. If I've added myself in error somewhere, feel free to replace it with the appropriate copyright holder instead. Going forward, all new source files should include a license header.
296 lines
12 KiB
C++
296 lines
12 KiB
C++
/*
|
|
* Copyright (c) 2018-2020, 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 <LibHTML/CSS/SelectorEngine.h>
|
|
#include <LibHTML/CSS/StyleResolver.h>
|
|
#include <LibHTML/CSS/StyleSheet.h>
|
|
#include <LibHTML/DOM/Document.h>
|
|
#include <LibHTML/DOM/Element.h>
|
|
#include <LibHTML/Dump.h>
|
|
#include <LibHTML/Parser/CSSParser.h>
|
|
#include <ctype.h>
|
|
#include <stdio.h>
|
|
|
|
StyleResolver::StyleResolver(Document& document)
|
|
: m_document(document)
|
|
{
|
|
}
|
|
|
|
StyleResolver::~StyleResolver()
|
|
{
|
|
}
|
|
|
|
static StyleSheet& default_stylesheet()
|
|
{
|
|
static StyleSheet* sheet;
|
|
if (!sheet) {
|
|
extern const char default_stylesheet_source[];
|
|
String css = default_stylesheet_source;
|
|
sheet = parse_css(css).leak_ref();
|
|
}
|
|
return *sheet;
|
|
}
|
|
|
|
template<typename Callback>
|
|
void StyleResolver::for_each_stylesheet(Callback callback) const
|
|
{
|
|
callback(default_stylesheet());
|
|
for (auto& sheet : document().stylesheets()) {
|
|
callback(sheet);
|
|
}
|
|
}
|
|
|
|
NonnullRefPtrVector<StyleRule> StyleResolver::collect_matching_rules(const Element& element) const
|
|
{
|
|
NonnullRefPtrVector<StyleRule> matching_rules;
|
|
|
|
for_each_stylesheet([&](auto& sheet) {
|
|
for (auto& rule : sheet.rules()) {
|
|
for (auto& selector : rule.selectors()) {
|
|
if (SelectorEngine::matches(selector, element)) {
|
|
matching_rules.append(rule);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
});
|
|
|
|
#ifdef HTML_DEBUG
|
|
dbgprintf("Rules matching Element{%p}\n", &element);
|
|
for (auto& rule : matching_rules) {
|
|
dump_rule(rule);
|
|
}
|
|
#endif
|
|
|
|
return matching_rules;
|
|
}
|
|
|
|
bool StyleResolver::is_inherited_property(CSS::PropertyID property_id)
|
|
{
|
|
static HashTable<CSS::PropertyID> inherited_properties;
|
|
if (inherited_properties.is_empty()) {
|
|
inherited_properties.set(CSS::PropertyID::BorderCollapse);
|
|
inherited_properties.set(CSS::PropertyID::BorderSpacing);
|
|
inherited_properties.set(CSS::PropertyID::Color);
|
|
inherited_properties.set(CSS::PropertyID::FontFamily);
|
|
inherited_properties.set(CSS::PropertyID::FontSize);
|
|
inherited_properties.set(CSS::PropertyID::FontStyle);
|
|
inherited_properties.set(CSS::PropertyID::FontVariant);
|
|
inherited_properties.set(CSS::PropertyID::FontWeight);
|
|
inherited_properties.set(CSS::PropertyID::LetterSpacing);
|
|
inherited_properties.set(CSS::PropertyID::LineHeight);
|
|
inherited_properties.set(CSS::PropertyID::ListStyle);
|
|
inherited_properties.set(CSS::PropertyID::ListStyleImage);
|
|
inherited_properties.set(CSS::PropertyID::ListStylePosition);
|
|
inherited_properties.set(CSS::PropertyID::ListStyleType);
|
|
inherited_properties.set(CSS::PropertyID::TextAlign);
|
|
inherited_properties.set(CSS::PropertyID::TextIndent);
|
|
inherited_properties.set(CSS::PropertyID::TextTransform);
|
|
inherited_properties.set(CSS::PropertyID::Visibility);
|
|
inherited_properties.set(CSS::PropertyID::WhiteSpace);
|
|
inherited_properties.set(CSS::PropertyID::WordSpacing);
|
|
|
|
// FIXME: This property is not supposed to be inherited, but we currently
|
|
// rely on inheritance to propagate decorations into line boxes.
|
|
inherited_properties.set(CSS::PropertyID::TextDecoration);
|
|
}
|
|
return inherited_properties.contains(property_id);
|
|
}
|
|
|
|
static Vector<String> split_on_whitespace(const StringView& string)
|
|
{
|
|
if (string.is_empty())
|
|
return {};
|
|
|
|
Vector<String> v;
|
|
size_t substart = 0;
|
|
for (size_t i = 0; i < string.length(); ++i) {
|
|
char ch = string.characters_without_null_termination()[i];
|
|
if (isspace(ch)) {
|
|
size_t sublen = i - substart;
|
|
if (sublen != 0)
|
|
v.append(string.substring_view(substart, sublen));
|
|
substart = i + 1;
|
|
}
|
|
}
|
|
size_t taillen = string.length() - substart;
|
|
if (taillen != 0)
|
|
v.append(string.substring_view(substart, taillen));
|
|
return v;
|
|
}
|
|
|
|
static void set_property_expanding_shorthands(StyleProperties& style, CSS::PropertyID property_id, const StyleValue& value)
|
|
{
|
|
if (property_id == CSS::PropertyID::BorderStyle) {
|
|
style.set_property(CSS::PropertyID::BorderTopStyle, value);
|
|
style.set_property(CSS::PropertyID::BorderRightStyle, value);
|
|
style.set_property(CSS::PropertyID::BorderBottomStyle, value);
|
|
style.set_property(CSS::PropertyID::BorderLeftStyle, value);
|
|
return;
|
|
}
|
|
|
|
if (property_id == CSS::PropertyID::BorderWidth) {
|
|
style.set_property(CSS::PropertyID::BorderTopWidth, value);
|
|
style.set_property(CSS::PropertyID::BorderRightWidth, value);
|
|
style.set_property(CSS::PropertyID::BorderBottomWidth, value);
|
|
style.set_property(CSS::PropertyID::BorderLeftWidth, value);
|
|
return;
|
|
}
|
|
|
|
if (property_id == CSS::PropertyID::BorderColor) {
|
|
style.set_property(CSS::PropertyID::BorderTopColor, value);
|
|
style.set_property(CSS::PropertyID::BorderRightColor, value);
|
|
style.set_property(CSS::PropertyID::BorderBottomColor, value);
|
|
style.set_property(CSS::PropertyID::BorderLeftColor, value);
|
|
return;
|
|
}
|
|
|
|
if (property_id == CSS::PropertyID::Margin) {
|
|
if (value.is_length()) {
|
|
style.set_property(CSS::PropertyID::MarginTop, value);
|
|
style.set_property(CSS::PropertyID::MarginRight, value);
|
|
style.set_property(CSS::PropertyID::MarginBottom, value);
|
|
style.set_property(CSS::PropertyID::MarginLeft, value);
|
|
return;
|
|
}
|
|
if (value.is_string()) {
|
|
auto parts = split_on_whitespace(value.to_string());
|
|
if (parts.size() == 2) {
|
|
auto vertical = parse_css_value(parts[0]);
|
|
auto horizontal = parse_css_value(parts[1]);
|
|
style.set_property(CSS::PropertyID::MarginTop, vertical);
|
|
style.set_property(CSS::PropertyID::MarginBottom, vertical);
|
|
style.set_property(CSS::PropertyID::MarginLeft, horizontal);
|
|
style.set_property(CSS::PropertyID::MarginRight, horizontal);
|
|
return;
|
|
}
|
|
if (parts.size() == 3) {
|
|
auto top = parse_css_value(parts[0]);
|
|
auto horizontal = parse_css_value(parts[1]);
|
|
auto bottom = parse_css_value(parts[2]);
|
|
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 (parts.size() == 4) {
|
|
auto top = parse_css_value(parts[0]);
|
|
auto right = parse_css_value(parts[1]);
|
|
auto bottom = parse_css_value(parts[2]);
|
|
auto left = parse_css_value(parts[3]);
|
|
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;
|
|
}
|
|
dbg() << "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 (parts.size() == 2) {
|
|
auto vertical = parse_css_value(parts[0]);
|
|
auto horizontal = parse_css_value(parts[1]);
|
|
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 (parts.size() == 3) {
|
|
auto top = parse_css_value(parts[0]);
|
|
auto horizontal = parse_css_value(parts[1]);
|
|
auto bottom = parse_css_value(parts[2]);
|
|
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 (parts.size() == 4) {
|
|
auto top = parse_css_value(parts[0]);
|
|
auto right = parse_css_value(parts[1]);
|
|
auto bottom = parse_css_value(parts[2]);
|
|
auto left = parse_css_value(parts[3]);
|
|
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;
|
|
}
|
|
dbg() << "Unsure what to do with CSS padding value '" << value.to_string() << "'";
|
|
return;
|
|
}
|
|
return;
|
|
}
|
|
|
|
style.set_property(property_id, value);
|
|
}
|
|
|
|
NonnullRefPtr<StyleProperties> StyleResolver::resolve_style(const Element& element, const StyleProperties* parent_style) const
|
|
{
|
|
auto style = StyleProperties::create();
|
|
|
|
if (parent_style) {
|
|
parent_style->for_each_property([&](auto property_id, auto& value) {
|
|
if (is_inherited_property(property_id))
|
|
set_property_expanding_shorthands(style, property_id, value);
|
|
});
|
|
}
|
|
|
|
element.apply_presentational_hints(*style);
|
|
|
|
auto matching_rules = collect_matching_rules(element);
|
|
for (auto& rule : matching_rules) {
|
|
for (auto& property : rule.declaration().properties()) {
|
|
set_property_expanding_shorthands(style, property.property_id, property.value);
|
|
}
|
|
}
|
|
|
|
auto style_attribute = element.attribute("style");
|
|
if (!style_attribute.is_null()) {
|
|
if (auto declaration = parse_css_declaration(style_attribute)) {
|
|
for (auto& property : declaration->properties()) {
|
|
set_property_expanding_shorthands(style, property.property_id, property.value);
|
|
}
|
|
}
|
|
}
|
|
|
|
return style;
|
|
}
|