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LibWeb: Make MediaFeature a top-level class and add factory methods

Web::CSS::MediaQuery::MediaFeature::Type was getting a bit ridiculous!
Also, this moves the detection of "min-" and "max-" media-features into
the MediaFeature itself, since this is an implementation detail, not
part of the spec.
This commit is contained in:
Sam Atkins 2021-12-29 21:17:44 +00:00 committed by Andreas Kling
parent d470e7e817
commit ae4f0000c8
4 changed files with 74 additions and 71 deletions

View file

@ -59,30 +59,30 @@ bool MediaFeatureValue::equals(MediaFeatureValue const& other) const
VERIFY_NOT_REACHED(); VERIFY_NOT_REACHED();
} }
String MediaQuery::MediaFeature::to_string() const String MediaFeature::to_string() const
{ {
switch (type) { switch (m_type) {
case Type::IsTrue: case Type::IsTrue:
return name; return m_name;
case Type::ExactValue: case Type::ExactValue:
return String::formatted("{}:{}", name, value->to_string()); return String::formatted("{}:{}", m_name, m_value->to_string());
case Type::MinValue: case Type::MinValue:
return String::formatted("min-{}:{}", name, value->to_string()); return String::formatted("min-{}:{}", m_name, m_value->to_string());
case Type::MaxValue: case Type::MaxValue:
return String::formatted("max-{}:{}", name, value->to_string()); return String::formatted("max-{}:{}", m_name, m_value->to_string());
} }
VERIFY_NOT_REACHED(); VERIFY_NOT_REACHED();
} }
bool MediaQuery::MediaFeature::evaluate(DOM::Window const& window) const bool MediaFeature::evaluate(DOM::Window const& window) const
{ {
auto maybe_queried_value = window.query_media_feature(name); auto maybe_queried_value = window.query_media_feature(m_name);
if (!maybe_queried_value.has_value()) if (!maybe_queried_value.has_value())
return false; return false;
auto queried_value = maybe_queried_value.release_value(); auto queried_value = maybe_queried_value.release_value();
switch (type) { switch (m_type) {
case Type::IsTrue: case Type::IsTrue:
if (queried_value.is_number()) if (queried_value.is_number())
return queried_value.number() != 0; return queried_value.number() != 0;
@ -93,18 +93,18 @@ bool MediaQuery::MediaFeature::evaluate(DOM::Window const& window) const
return false; return false;
case Type::ExactValue: case Type::ExactValue:
return queried_value.equals(*value); return queried_value.equals(*m_value);
case Type::MinValue: case Type::MinValue:
if (!value->is_same_type(queried_value)) if (!m_value->is_same_type(queried_value))
return false; return false;
if (value->is_number()) if (m_value->is_number())
return queried_value.number() >= value->number(); return queried_value.number() >= m_value->number();
if (value->is_length()) { if (m_value->is_length()) {
auto& queried_length = queried_value.length(); auto& queried_length = queried_value.length();
auto& value_length = value->length(); auto& value_length = m_value->length();
// FIXME: Handle relative lengths. https://www.w3.org/TR/mediaqueries-4/#ref-for-relative-length // FIXME: Handle relative lengths. https://www.w3.org/TR/mediaqueries-4/#ref-for-relative-length
if (!value_length.is_absolute()) { if (!value_length.is_absolute()) {
dbgln("Media feature was given a non-absolute length! {}", value_length.to_string()); dbgln("Media feature was given a non-absolute length! {}", value_length.to_string());
@ -116,15 +116,15 @@ bool MediaQuery::MediaFeature::evaluate(DOM::Window const& window) const
return false; return false;
case Type::MaxValue: case Type::MaxValue:
if (!value->is_same_type(queried_value)) if (!m_value->is_same_type(queried_value))
return false; return false;
if (value->is_number()) if (m_value->is_number())
return queried_value.number() <= value->number(); return queried_value.number() <= m_value->number();
if (value->is_length()) { if (m_value->is_length()) {
auto& queried_length = queried_value.length(); auto& queried_length = queried_value.length();
auto& value_length = value->length(); auto& value_length = m_value->length();
// FIXME: Handle relative lengths. https://www.w3.org/TR/mediaqueries-4/#ref-for-relative-length // FIXME: Handle relative lengths. https://www.w3.org/TR/mediaqueries-4/#ref-for-relative-length
if (!value_length.is_absolute()) { if (!value_length.is_absolute()) {
dbgln("Media feature was given a non-absolute length! {}", value_length.to_string()); dbgln("Media feature was given a non-absolute length! {}", value_length.to_string());
@ -145,7 +145,7 @@ String MediaQuery::MediaCondition::to_string() const
builder.append('('); builder.append('(');
switch (type) { switch (type) {
case Type::Single: case Type::Single:
builder.append(feature.to_string()); builder.append(feature->to_string());
break; break;
case Type::Not: case Type::Not:
builder.append("not "); builder.append("not ");
@ -169,7 +169,7 @@ MatchResult MediaQuery::MediaCondition::evaluate(DOM::Window const& window) cons
{ {
switch (type) { switch (type) {
case Type::Single: case Type::Single:
return as_match_result(feature.evaluate(window)); return as_match_result(feature->evaluate(window));
case Type::Not: case Type::Not:
return negate(conditions.first().evaluate(window)); return negate(conditions.first().evaluate(window));
case Type::And: case Type::And:

View file

@ -69,6 +69,49 @@ private:
Variant<String, Length, double> m_value; Variant<String, Length, double> m_value;
}; };
// https://www.w3.org/TR/mediaqueries-4/#mq-features
class MediaFeature {
public:
// Corresponds to `<mf-boolean>` grammar
static MediaFeature boolean(String const& name)
{
return MediaFeature(Type::IsTrue, name);
}
// Corresponds to `<mf-plain>` grammar
static MediaFeature plain(String const& name, MediaFeatureValue value)
{
if (name.starts_with("min-", CaseSensitivity::CaseInsensitive))
return MediaFeature(Type::MinValue, name.substring_view(4), move(value));
if (name.starts_with("max-", CaseSensitivity::CaseInsensitive))
return MediaFeature(Type::MaxValue, name.substring_view(4), move(value));
return MediaFeature(Type::ExactValue, move(name), move(value));
}
bool evaluate(DOM::Window const&) const;
String to_string() const;
private:
// FIXME: Implement range syntax: https://www.w3.org/TR/mediaqueries-4/#mq-ranges
enum class Type {
IsTrue,
ExactValue,
MinValue,
MaxValue,
};
MediaFeature(Type type, FlyString name, Optional<MediaFeatureValue> value = {})
: m_type(type)
, m_name(move(name))
, m_value(move(value))
{
}
Type m_type;
FlyString m_name;
Optional<MediaFeatureValue> m_value {};
};
class MediaQuery : public RefCounted<MediaQuery> { class MediaQuery : public RefCounted<MediaQuery> {
friend class Parser; friend class Parser;
@ -92,24 +135,6 @@ public:
Speech, Speech,
}; };
// https://www.w3.org/TR/mediaqueries-4/#mq-features
struct MediaFeature {
// FIXME: Implement range syntax: https://www.w3.org/TR/mediaqueries-4/#mq-ranges
enum class Type {
IsTrue,
ExactValue,
MinValue,
MaxValue,
};
Type type;
FlyString name;
Optional<MediaFeatureValue> value {};
bool evaluate(DOM::Window const&) const;
String to_string() const;
};
// https://www.w3.org/TR/mediaqueries-4/#media-conditions // https://www.w3.org/TR/mediaqueries-4/#media-conditions
struct MediaCondition { struct MediaCondition {
enum class Type { enum class Type {
@ -121,7 +146,7 @@ public:
}; };
Type type; Type type;
MediaFeature feature; Optional<MediaFeature> feature;
NonnullOwnPtrVector<MediaCondition> conditions; NonnullOwnPtrVector<MediaCondition> conditions;
Optional<GeneralEnclosed> general_enclosed; Optional<GeneralEnclosed> general_enclosed;
@ -155,8 +180,8 @@ String serialize_a_media_query_list(NonnullRefPtrVector<MediaQuery> const&);
namespace AK { namespace AK {
template<> template<>
struct Formatter<Web::CSS::MediaQuery::MediaFeature> : Formatter<StringView> { struct Formatter<Web::CSS::MediaFeature> : Formatter<StringView> {
ErrorOr<void> format(FormatBuilder& builder, Web::CSS::MediaQuery::MediaFeature const& media_feature) ErrorOr<void> format(FormatBuilder& builder, Web::CSS::MediaFeature const& media_feature)
{ {
return Formatter<StringView>::format(builder, media_feature.to_string()); return Formatter<StringView>::format(builder, media_feature.to_string());
} }

View file

@ -860,11 +860,11 @@ OwnPtr<MediaQuery::MediaCondition> Parser::consume_media_condition(TokenStream<S
return {}; return {};
} }
Optional<MediaQuery::MediaFeature> Parser::consume_media_feature(TokenStream<StyleComponentValueRule>& outer_tokens) Optional<MediaFeature> Parser::consume_media_feature(TokenStream<StyleComponentValueRule>& outer_tokens)
{ {
outer_tokens.skip_whitespace(); outer_tokens.skip_whitespace();
auto invalid_feature = [&]() -> Optional<MediaQuery::MediaFeature> { auto invalid_feature = [&]() -> Optional<MediaFeature> {
outer_tokens.reconsume_current_input_token(); outer_tokens.reconsume_current_input_token();
return {}; return {};
}; };
@ -884,12 +884,8 @@ Optional<MediaQuery::MediaFeature> Parser::consume_media_feature(TokenStream<Sty
auto feature_name = name_token.token().ident(); auto feature_name = name_token.token().ident();
tokens.skip_whitespace(); tokens.skip_whitespace();
if (!tokens.has_next_token()) { if (!tokens.has_next_token())
return MediaQuery::MediaFeature { return MediaFeature::boolean(feature_name);
.type = MediaQuery::MediaFeature::Type::IsTrue,
.name = feature_name,
};
}
if (!tokens.next_token().is(Token::Type::Colon)) if (!tokens.next_token().is(Token::Type::Colon))
return invalid_feature(); return invalid_feature();
@ -902,25 +898,7 @@ Optional<MediaQuery::MediaFeature> Parser::consume_media_feature(TokenStream<Sty
if (tokens.has_next_token()) if (tokens.has_next_token())
return invalid_feature(); return invalid_feature();
if (feature_name.starts_with("min-", CaseSensitivity::CaseInsensitive)) { return MediaFeature::plain(feature_name, value.release_value());
return MediaQuery::MediaFeature {
.type = MediaQuery::MediaFeature::Type::MinValue,
.name = feature_name.substring_view(4),
.value = value.release_value(),
};
} else if (feature_name.starts_with("max-", CaseSensitivity::CaseInsensitive)) {
return MediaQuery::MediaFeature {
.type = MediaQuery::MediaFeature::Type::MaxValue,
.name = feature_name.substring_view(4),
.value = value.release_value(),
};
}
return MediaQuery::MediaFeature {
.type = MediaQuery::MediaFeature::Type::ExactValue,
.name = feature_name,
.value = value.release_value(),
};
} }
return invalid_feature(); return invalid_feature();

View file

@ -236,7 +236,7 @@ private:
NonnullRefPtr<MediaQuery> parse_media_query(TokenStream<StyleComponentValueRule>&); NonnullRefPtr<MediaQuery> parse_media_query(TokenStream<StyleComponentValueRule>&);
OwnPtr<MediaQuery::MediaCondition> consume_media_condition(TokenStream<StyleComponentValueRule>&); OwnPtr<MediaQuery::MediaCondition> consume_media_condition(TokenStream<StyleComponentValueRule>&);
Optional<MediaQuery::MediaFeature> consume_media_feature(TokenStream<StyleComponentValueRule>&); Optional<MediaFeature> consume_media_feature(TokenStream<StyleComponentValueRule>&);
Optional<MediaQuery::MediaType> consume_media_type(TokenStream<StyleComponentValueRule>&); Optional<MediaQuery::MediaType> consume_media_type(TokenStream<StyleComponentValueRule>&);
Optional<MediaFeatureValue> parse_media_feature_value(TokenStream<StyleComponentValueRule>&); Optional<MediaFeatureValue> parse_media_feature_value(TokenStream<StyleComponentValueRule>&);