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LibHTML: Implement some attribute selector support

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This patch adds a[foo] and a[foo=bar] attribute selectors.

Note that an attribute selector is an optional part of a selector
component, and not a component on its own.
This commit is contained in:
Andreas Kling 2019-11-21 20:07:43 +01:00
parent 54a6ae9201
commit 8946e50986
6 changed files with 115 additions and 8 deletions
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10
Libraries/LibHTML/CSS/Selector.h
View file

@ -33,6 +33,16 @@ public:
Relation relation { Relation::None };
String value;
enum class AttributeMatchType {
None,
HasAttribute,
ExactValueMatch,
};
AttributeMatchType attribute_match_type { AttributeMatchType::None };
String attribute_name;
String attribute_value;
};
explicit Selector(Vector<Component>&&);

13
Libraries/LibHTML/CSS/SelectorEngine.cpp
View file

@ -29,6 +29,19 @@ bool matches(const Selector::Component& component, const Element& element)
break;
}
switch (component.attribute_match_type) {
case Selector::Component::AttributeMatchType::HasAttribute:
if (!element.has_attribute(component.attribute_name))
return false;
break;
case Selector::Component::AttributeMatchType::ExactValueMatch:
if (element.attribute(component.attribute_name) != component.attribute_value)
return false;
break;
default:
break;
}
switch (component.type) {
case Selector::Component::Type::Universal:
return true;

20
Libraries/LibHTML/Dump.cpp
View file

@ -180,12 +180,28 @@ void dump_rule(const StyleRule& rule)
relation_description = "{GeneralSibling}";
break;
}
dbgprintf(" %s:%s %s\n", type_description, component.value.characters(), relation_description);
const char* attribute_match_type_description = "";
switch (component.attribute_match_type) {
case Selector::Component::AttributeMatchType::None:
break;
case Selector::Component::AttributeMatchType::HasAttribute:
attribute_match_type_description = "HasAttribute";
break;
case Selector::Component::AttributeMatchType::ExactValueMatch:
attribute_match_type_description = "ExactValueMatch";
break;
}
dbgprintf(" %s:%s %s", type_description, component.value.characters(), relation_description);
if (component.attribute_match_type != Selector::Component::AttributeMatchType::None) {
dbgprintf(" [%s, name='%s', value='%s']", attribute_match_type_description, component.attribute_name.characters(), component.attribute_value.characters());
}
dbgprintf("\n");
}
}
dbgprintf(" Declarations:\n");
for (auto& property : rule.declaration().properties()) {
dbgprintf(" CSS::PropertyID(%u): '%s'\n", (unsigned)property.property_id, property.value->to_string().characters());
dbgprintf(" %s: '%s'\n", CSS::string_from_property_id(property.property_id), property.value->to_string().characters());
}
}

60
Libraries/LibHTML/Parser/CSSParser.cpp
View file

@ -227,7 +227,15 @@ public:
if (peek() == '*') {
type = Selector::Component::Type::Universal;
consume_one();
return Selector::Component { type, Selector::Component::PseudoClass::None, relation, String() };
return Selector::Component {
type,
Selector::Component::PseudoClass::None,
relation,
String(),
Selector::Component::AttributeMatchType::None,
String(),
String()
};
}
if (peek() == '.') {
@ -244,15 +252,55 @@ public:
buffer.append(consume_one());
PARSE_ASSERT(!buffer.is_null());
Selector::Component component { type, Selector::Component::PseudoClass::None, relation, String::copy(buffer) };
Selector::Component component {
type,
Selector::Component::PseudoClass::None,
relation,
String::copy(buffer),
Selector::Component::AttributeMatchType::None,
String(),
String()
};
buffer.clear();
if (peek() == '[') {
// FIXME: Implement attribute selectors.
while (peek() != ']') {
consume_one();
Selector::Component::AttributeMatchType attribute_match_type = Selector::Component::AttributeMatchType::HasAttribute;
String attribute_name;
String attribute_value;
bool in_value = false;
consume_specific('[');
char expected_end_of_attribute_selector = ']';
while (peek() != expected_end_of_attribute_selector) {
char ch = consume_one();
if (ch == '=') {
attribute_match_type = Selector::Component::AttributeMatchType::ExactValueMatch;
attribute_name = String::copy(buffer);
buffer.clear();
in_value = true;
consume_whitespace_or_comments();
if (peek() == '\'') {
expected_end_of_attribute_selector = '\'';
consume_one();
} else if (peek() == '"') {
expected_end_of_attribute_selector = '"';
consume_one();
}
continue;
}
buffer.append(ch);
}
consume_one();
if (in_value)
attribute_value = String::copy(buffer);
else
attribute_name = String::copy(buffer);
buffer.clear();
component.attribute_match_type = attribute_match_type;
component.attribute_name = attribute_name;
component.attribute_value = attribute_value;
if (expected_end_of_attribute_selector != ']')
consume_specific(expected_end_of_attribute_selector);
consume_whitespace_or_comments();
consume_specific(']');
}
if (peek() == ':') {