Enum Leaf 

#[repr(u8)]
pub enum Leaf {
    Length(NoCalcLength),
    Angle(NoCalcAngle),
    Time(NoCalcTime),
    Resolution(NoCalcResolution),
    ColorComponent(ChannelKeyword),
    Percentage(CalcPercentageLeaf),
    Number(NoCalcNumber),
    TreeCountingFunction(TreeCountingFunction),
}

A leaf node inside a Calc expression’s AST.

Variants

Length(NoCalcLength)

<length>

Angle(NoCalcAngle)

<angle>

Time(NoCalcTime)

<time>

Resolution(NoCalcResolution)

<resolution>

ColorComponent(ChannelKeyword)

A component of a color.

Percentage(CalcPercentageLeaf)

<percentage>

Number(NoCalcNumber)

<number>

TreeCountingFunction(TreeCountingFunction)

A tree-counting function.

Implementations

impl Leaf

pub fn to_computed_value( &self, context: Option<&Context<'_>>, origin_color: Option<&AbsoluteColor>, ) -> Self

Computes this leaf against the given context (if any), substituting color channel references with the matching channel of origin_color when it is provided. If no origin color is available, channel references are kept symbolic so they can be resolved later.

Trait Implementations

impl CalcNodeLeaf for Leaf

fn try_sum_in_place(&mut self, other: &Self) -> Result<(), ()>

Tries to merge one sum to another, that is, perform x + y.

Only handles leaf nodes, it’s the caller’s responsibility to simplify them before calling this if needed.

fn numeric_type(&self) -> NumericType

Returns the type of the leaf.

fn unitless_value(&self) -> Option<f32>

Returns the unitless value of this leaf if one is available.

fn canonical_value(&self) -> Option<f32>

Returns the canonical value of this leaf in the type’s canonical unit, if there is enough information to determine its numeric value. https://drafts.csswg.org/css-values-4/#simplify-a-calculation-tree

fn is_same_unit_as(&self, other: &Self) -> bool

Return true if the units of both leaves are equal. (NOTE: Does not take the values into account)

fn as_percentage(&self) -> Option<(f32, Optional<NumericBaseType>)>

Returns the value and percent hint if this leaf is a percentage.

fn as_angle_radians(&self) -> Option<f32>

Returns the angle value in radians if this leaf is an angle.

fn new_angle_from_radians(radians: f32) -> Self

Creates a new angle leaf from a value in radians.

fn new_number(value: f32) -> Self

Create a new leaf with a number value.

fn new_from_typed_value( value: f32, numeric_type: NumericType, ) -> Result<Self, ()>

Create a new leaf with value in the canonical unit of the given type. Returns Err(()) if the type cannot be constructed as a leaf.

fn compare(&self, other: &Self) -> Option<Ordering>

Do a partial comparison of these values.

fn as_number(&self) -> Option<f32>

Returns a float value if the leaf is a number.

fn sort_key(&self) -> SortKey

Returns the sort key for simplification.

fn simplify(&mut self) -> SimplificationResult

Canonicalizes the expression if necessary.

fn try_product_in_place(&mut self, other: &mut Self) -> bool

Try to merge the right leaf into the left by using a multiplication. Return true if the merge was successful, otherwise false.

fn try_op<O>(&self, other: &Self, op: O) -> Result<Self, ()>

where O: Fn(f32, f32) -> f32,

Tries a generic arithmetic operation.

fn map(&mut self, op: impl FnMut(f32) -> f32) -> Result<(), ()>

Map the value of this node with the given operation.

fn should_serialize_with_root_calc_wrapper(&self) -> bool

Whether this leaf node should serialize with a calc() wrapper if this node is the root of the calculation tree.

fn gt(&self, other: &Self) -> bool

Return whether a leaf is greater than another.

fn lt(&self, other: &Self) -> bool

Return whether a leaf is less than another.

fn lte(&self, other: &Self) -> bool

Return whether a leaf is smaller or equal than another.

fn as_number_or_angle_radians(&self) -> Option<f32>

Returns a number or angle radians if the leaf is a number or angle.

fn is_negative(&self) -> Result<bool, ()>

Whether this value is known-negative.

fn is_infinite(&self) -> Result<bool, ()>

Whether this value is infinite.

fn is_zero(&self) -> Result<bool, ()>

Whether this value is zero.

fn is_nan(&self) -> Result<bool, ()>

Whether this value is NaN.

fn sign_from(leaf: &impl CalcNodeLeaf) -> Result<Self, ()>

Create a new leaf containing the sign() result of the given leaf.

impl Clone for Leaf

fn clone(&self) -> Leaf

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Leaf

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl MallocSizeOf for Leaf

fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize

Measure the heap usage of all descendant heap-allocated structures, but not the space taken up by the value itself.

impl PartialEq for Leaf

fn eq(&self, other: &Leaf) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl ToCss for Leaf

fn to_css<W>(&self, dest: &mut CssWriter<'_, W>) -> Result

where W: Write,

Serialize self in CSS syntax, writing to dest.

fn to_css_string(&self) -> String

Serialize self in CSS syntax and return a string.

fn to_css_cssstring(&self) -> String

Serialize self in CSS syntax and return a CssString.

impl ToShmem for Leaf

fn to_shmem(&self, builder: &mut SharedMemoryBuilder) -> Result<Self>

Clones this value into a form suitable for writing into a SharedMemoryBuilder.

impl ToTyped for Leaf

fn to_typed(&self, dest: &mut ThinVec<TypedValue>) -> Result<(), ()>

Attempt to convert self into one or more TypedValue items.

fn to_typed_value(&self) -> Option<TypedValue>

Attempt to convert self into a TypedValue.

fn to_numeric_value(&self) -> Option<NumericValue>

Attempt to convert self into a NumericValue.

fn to_typed_value_list(&self) -> Option<TypedValueList>

Attempt to convert self into a TypedValueList.

impl StructuralPartialEq for Leaf