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/*
* Copyright (c) 2021, Sam Atkins <atkinssj@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibWeb/CSS/MediaQuery.h>
#include <LibWeb/DOM/Document.h>
#include <LibWeb/DOM/Window.h>
namespace Web::CSS {
NonnullRefPtr<MediaQuery> MediaQuery::create_not_all()
{
auto media_query = new MediaQuery;
media_query->m_negated = true;
media_query->m_media_type = MediaType::All;
return adopt_ref(*media_query);
}
String MediaQuery::MediaFeature::to_string() const
{
switch (type) {
case Type::IsTrue:
return name;
case Type::ExactValue:
return String::formatted("{}:{}", name, value->to_string());
case Type::MinValue:
return String::formatted("min-{}:{}", name, value->to_string());
case Type::MaxValue:
return String::formatted("max-{}:{}", name, value->to_string());
}
VERIFY_NOT_REACHED();
}
bool MediaQuery::MediaFeature::evaluate(DOM::Window const& window) const
{
auto queried_value = window.query_media_feature(name);
if (!queried_value)
return false;
switch (type) {
case Type::IsTrue:
if (queried_value->has_number())
return queried_value->to_number() != 0;
if (queried_value->has_length())
return queried_value->to_length().raw_value() != 0;
if (queried_value->has_identifier())
return queried_value->to_identifier() != ValueID::None;
return false;
case Type::ExactValue:
return queried_value->equals(*value);
case Type::MinValue:
if (queried_value->has_number() && value->has_number())
return queried_value->to_number() >= value->to_number();
if (queried_value->has_length() && value->has_length()) {
auto queried_length = queried_value->to_length();
auto value_length = value->to_length();
// FIXME: We should be checking that lengths are valid during parsing
if (!value_length.is_absolute()) {
dbgln("Media feature was given a non-absolute length, which is invalid! {}", value_length.to_string());
return false;
}
return queried_length.absolute_length_to_px() >= value_length.absolute_length_to_px();
}
return false;
case Type::MaxValue:
if (queried_value->has_number() && value->has_number())
return queried_value->to_number() <= value->to_number();
if (queried_value->has_length() && value->has_length()) {
auto queried_length = queried_value->to_length();
auto value_length = value->to_length();
// FIXME: We should be checking that lengths are valid during parsing
if (!value_length.is_absolute()) {
dbgln("Media feature was given a non-absolute length, which is invalid! {}", value_length.to_string());
return false;
}
return queried_length.absolute_length_to_px() <= value_length.absolute_length_to_px();
}
return false;
}
VERIFY_NOT_REACHED();
}
String MediaQuery::MediaCondition::to_string() const
{
StringBuilder builder;
builder.append('(');
switch (type) {
case Type::Single:
builder.append(feature.to_string());
break;
case Type::Not:
builder.append("not ");
builder.append(conditions.first().to_string());
break;
case Type::And:
builder.join(" and ", conditions);
break;
case Type::Or:
builder.join(" or ", conditions);
break;
}
builder.append(')');
return builder.to_string();
}
bool MediaQuery::MediaCondition::evaluate(DOM::Window const& window) const
{
switch (type) {
case Type::Single:
return feature.evaluate(window);
case Type::Not:
return !conditions.first().evaluate(window);
case Type::And:
for (auto& child : conditions) {
if (!child.evaluate(window))
return false;
}
return true;
case Type::Or:
for (auto& child : conditions) {
if (child.evaluate(window))
return true;
}
return false;
}
VERIFY_NOT_REACHED();
}
String MediaQuery::to_string() const
{
StringBuilder builder;
if (m_negated)
builder.append("not ");
if (m_negated || m_media_type != MediaType::All || !m_media_condition) {
switch (m_media_type) {
case MediaType::All:
builder.append("all");
break;
case MediaType::Aural:
builder.append("aural");
break;
case MediaType::Braille:
builder.append("braille");
break;
case MediaType::Embossed:
builder.append("embossed");
break;
case MediaType::Handheld:
builder.append("handheld");
break;
case MediaType::Print:
builder.append("print");
break;
case MediaType::Projection:
builder.append("projection");
break;
case MediaType::Screen:
builder.append("screen");
break;
case MediaType::Speech:
builder.append("speech");
break;
case MediaType::TTY:
builder.append("tty");
break;
case MediaType::TV:
builder.append("tv");
break;
}
if (m_media_condition)
builder.append(" and ");
}
if (m_media_condition) {
builder.append(m_media_condition->to_string());
}
return builder.to_string();
}
bool MediaQuery::evaluate(DOM::Window const& window)
{
auto matches_media = [](MediaType media) -> bool {
switch (media) {
case MediaType::All:
return true;
case MediaType::Print:
// FIXME: Enable for printing, when we have printing!
return false;
case MediaType::Screen:
// FIXME: Disable for printing, when we have printing!
return true;
// Deprecated, must never match:
case MediaType::TTY:
case MediaType::TV:
case MediaType::Projection:
case MediaType::Handheld:
case MediaType::Braille:
case MediaType::Embossed:
case MediaType::Aural:
case MediaType::Speech:
return false;
}
VERIFY_NOT_REACHED();
};
bool result = matches_media(m_media_type);
if (result && m_media_condition)
result = m_media_condition->evaluate(window);
m_matches = m_negated ? !result : result;
return m_matches;
}
// https://www.w3.org/TR/cssom-1/#serialize-a-media-query-list
String serialize_a_media_query_list(NonnullRefPtrVector<MediaQuery> const& media_queries)
{
// 1. If the media query list is empty, then return the empty string.
if (media_queries.is_empty())
return "";
// 2. Serialize each media query in the list of media queries, in the same order as they
// appear in the media query list, and then serialize the list.
StringBuilder builder;
builder.join(", ", media_queries);
return builder.to_string();
}
}
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