Trait style::values::generics::calc::CalcNodeLeaf

pub trait CalcNodeLeaf: Clone + Sized + PartialEq + ToCss {
    // Required methods
    fn unit(&self) -> CalcUnits;
    fn unitless_value(&self) -> Option<f32>;
    fn compare(
        &self,
        other: &Self,
        base_is_positive: PositivePercentageBasis,
    ) -> Option<Ordering>;
    fn new_number(value: f32) -> Self;
    fn as_number(&self) -> Option<f32>;
    fn try_sum_in_place(&mut self, other: &Self) -> Result<(), ()>;
    fn try_product_in_place(&mut self, other: &mut Self) -> bool;
    fn try_op<O>(&self, other: &Self, op: O) -> Result<Self, ()>
       where O: Fn(f32, f32) -> f32;
    fn map(&mut self, op: impl FnMut(f32) -> f32) -> Result<(), ()>;
    fn simplify(&mut self);
    fn sort_key(&self) -> SortKey;

    // Provided methods
    fn is_same_unit_as(&self, other: &Self) -> bool { ... }
    fn gt(&self, other: &Self, basis_positive: PositivePercentageBasis) -> bool { ... }
    fn lt(&self, other: &Self, basis_positive: PositivePercentageBasis) -> bool { ... }
    fn lte(&self, other: &Self, basis_positive: PositivePercentageBasis) -> bool { ... }
    fn is_negative(&self) -> Result<bool, ()> { ... }
    fn is_infinite(&self) -> Result<bool, ()> { ... }
    fn is_zero(&self) -> Result<bool, ()> { ... }
    fn is_nan(&self) -> Result<bool, ()> { ... }
    fn sign_from(leaf: &impl CalcNodeLeaf) -> Result<Self, ()> { ... }
}

A trait that represents all the stuff a valid leaf of a calc expression.

Required Methods

fn unit(&self) -> CalcUnits

Returns the unit of the leaf.

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

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

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

Do a partial comparison of these values.

fn new_number(value: f32) -> Self

Create a new leaf with a number value.

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

Returns a float value if the leaf is a number.

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

Tries to merge one leaf into another using the sum, that is, perform x + y.

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 simplify(&mut self)

Canonicalizes the expression if necessary.

fn sort_key(&self) -> SortKey

Returns the sort key for simplification.

Provided Methods

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

Return whether a leaf is greater than another.

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

Return whether a leaf is less than another.

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

Return whether a leaf is smaller or equal than another.

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.

Object Safety

This trait is not object safe.

Implementors

impl CalcNodeLeaf for CalcLengthPercentageLeaf

impl CalcNodeLeaf for Leaf