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LibWeb: Make CSS 'An+B' parsing spec-compliant

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Parsing this pattern from CSS tokens turns out to be slightly crazy, but
thankfully well documented in the spec.

The spec lists the cases in order of simple -> complicated, but this
would cause problems in code, since `<n-dimension> <signed-.integer>`
would never by reached, as `<n-dimension>` comes before. Instead, I
have grouped them by their first token.

Also renamed the NthChildPattern class to ANPlusBPattern, to match spec
terminology.
This commit is contained in:
Sam Atkins 2021-07-24 21:22:44 +01:00 • committed by Andreas Kling
parent 8d0ff98eff
commit 6034fc0ee6
7 changed files with 333 additions and 92 deletions
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29
Userland/Libraries/LibWeb/CSS/Parser/Token.h
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@ -100,11 +100,34 @@ public:
}
bool is(NumberType number_type) const { return is(Token::Type::Number) && m_number_type == number_type; }
int integer() const
StringView number_string_value() const
{
VERIFY(m_type == Type::Number);
return m_value.string_view();
}
int to_integer() const
{
VERIFY(m_type == Type::Number && m_number_type == NumberType::Integer);
return m_value.string_view().to_int().value();
return number_string_value().to_int().value();
}
bool is_integer_value_signed() const { return number_string_value().starts_with('-') || number_string_value().starts_with('+'); }
StringView dimension_unit() const
{
VERIFY(m_type == Type::Dimension);
return m_unit.string_view();
}
StringView dimension_value() const
{
VERIFY(m_type == Type::Dimension);
return m_value.string_view();
}
int dimension_value_int() const { return dimension_value().to_int().value(); }
NumberType number_type() const
{
VERIFY((m_type == Type::Number) || (m_type == Type::Dimension));
return m_number_type;
}
Type mirror_variant() const;