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LibWeb: Resolve type of calc() expressions at parse-time

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See https://www.w3.org/TR/css-values-3/#calc-type-checking

If the sub-expressions' types are incompatible, we discard the calc() as
invalid.

Had to do some minor rearranging/renaming of the Calc structs to make
the `resolve_foo_type()` templates work too.
This commit is contained in:
Sam Atkins 2022-01-25 14:45:08 +00:00 • committed by Andreas Kling
parent b818d952d1
commit b69f6097de
4 changed files with 265 additions and 25 deletions
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54
Userland/Libraries/LibWeb/CSS/StyleValue.h
View file

@ -654,6 +654,16 @@ private:
class CalculatedStyleValue : public StyleValue {
public:
enum class ResolvedType {
Angle,
Frequency,
Integer,
Length,
Number,
Percentage,
Time,
};
struct CalcSum;
struct CalcSumPartWithOperator;
struct CalcProduct;
@ -663,8 +673,15 @@ public:
struct CalcNumberProduct;
struct CalcNumberProductPartWithOperator;
using CalcNumberValue = Variant<float, NonnullOwnPtr<CalcNumberSum>>;
using CalcValue = Variant<float, CSS::Length, NonnullOwnPtr<CalcSum>>;
struct CalcNumberValue {
Variant<float, NonnullOwnPtr<CalcNumberSum>> value;
Optional<ResolvedType> resolved_type() const;
};
struct CalcValue {
Variant<float, CSS::Length, NonnullOwnPtr<CalcSum>> value;
Optional<ResolvedType> resolved_type() const;
};
enum class SumOperation {
Add,
@ -683,6 +700,8 @@ public:
NonnullOwnPtr<CalcProduct> first_calc_product;
NonnullOwnPtrVector<CalcSumPartWithOperator> zero_or_more_additional_calc_products;
Optional<ResolvedType> resolved_type() const;
};
struct CalcNumberSum {
@ -692,63 +711,80 @@ public:
NonnullOwnPtr<CalcNumberProduct> first_calc_number_product;
NonnullOwnPtrVector<CalcNumberSumPartWithOperator> zero_or_more_additional_calc_number_products;
Optional<ResolvedType> resolved_type() const;
};
struct CalcProduct {
CalcValue first_calc_value;
NonnullOwnPtrVector<CalcProductPartWithOperator> zero_or_more_additional_calc_values;
Optional<ResolvedType> resolved_type() const;
};
struct CalcSumPartWithOperator {
CalcSumPartWithOperator(SumOperation op, NonnullOwnPtr<CalcProduct> calc_product)
: op(op)
, calc_product(move(calc_product)) {};
, value(move(calc_product)) {};
SumOperation op;
NonnullOwnPtr<CalcProduct> calc_product;
NonnullOwnPtr<CalcProduct> value;
Optional<ResolvedType> resolved_type() const;
};
struct CalcProductPartWithOperator {
ProductOperation op;
Variant<CalcValue, CalcNumberValue> value;
Optional<ResolvedType> resolved_type() const;
};
struct CalcNumberProduct {
CalcNumberValue first_calc_number_value;
NonnullOwnPtrVector<CalcNumberProductPartWithOperator> zero_or_more_additional_calc_number_values;
Optional<ResolvedType> resolved_type() const;
};
struct CalcNumberProductPartWithOperator {
ProductOperation op;
CalcNumberValue value;
Optional<ResolvedType> resolved_type() const;
};
struct CalcNumberSumPartWithOperator {
CalcNumberSumPartWithOperator(SumOperation op, NonnullOwnPtr<CalcNumberProduct> calc_number_product)
: op(op)
, calc_number_product(move(calc_number_product)) {};
, value(move(calc_number_product)) {};
SumOperation op;
NonnullOwnPtr<CalcNumberProduct> calc_number_product;
NonnullOwnPtr<CalcNumberProduct> value;
Optional<ResolvedType> resolved_type() const;
};
static NonnullRefPtr<CalculatedStyleValue> create(String const& expression_string, NonnullOwnPtr<CalcSum> calc_sum)
static NonnullRefPtr<CalculatedStyleValue> create(String const& expression_string, NonnullOwnPtr<CalcSum> calc_sum, ResolvedType resolved_type)
{
return adopt_ref(*new CalculatedStyleValue(expression_string, move(calc_sum)));
return adopt_ref(*new CalculatedStyleValue(expression_string, move(calc_sum), resolved_type));
}
String to_string() const override { return m_expression_string; }
ResolvedType resolved_type() const { return m_resolved_type; }
NonnullOwnPtr<CalcSum> const& expression() const { return m_expression; }
Optional<Length> resolve_length(Layout::Node const& layout_node) const;
private:
explicit CalculatedStyleValue(String const& expression_string, NonnullOwnPtr<CalcSum> calc_sum)
explicit CalculatedStyleValue(String const& expression_string, NonnullOwnPtr<CalcSum> calc_sum, ResolvedType resolved_type)
: StyleValue(Type::Calculated)
, m_resolved_type(resolved_type)
, m_expression_string(expression_string)
, m_expression(move(calc_sum))
{
}
ResolvedType m_resolved_type;
String m_expression_string;
NonnullOwnPtr<CalcSum> m_expression;
};