Enum CalcAstItem 

#[repr(C, u8)]
pub enum CalcAstItem {
    Value(PixelValue),
    Add,
    Sub,
    Mul,
    Div,
    BraceOpen,
    BraceClose,
}

A single item in a calc() expression, stored as a flat stack-machine representation.

The expression calc(33.333% - 10px) is stored as:

[Value(33.333%), Sub, Value(10px)]

For nested expressions like calc(100% - (20px + 5%)):

[Value(100%), Sub, BraceOpen, Value(20px), Add, Value(5%), BraceClose]

Resolution: Walk left to right. When BraceClose is hit, resolve everything back to the matching BraceOpen, replace that span with a single Value, and continue.

Variants

Value(PixelValue)

A literal value (e.g. 10px, 33.333%, 2em)

Add

+ operator

Sub

- operator

Mul

* operator

Div

/ operator

BraceOpen

( — opens a sub-expression

BraceClose

) — closes a sub-expression; triggers resolution of the inner span

Trait Implementations

impl Clone for CalcAstItem

fn clone(&self) -> CalcAstItem

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CalcAstItem

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

Formats the value using the given formatter.

impl Extend<CalcAstItem> for CalcAstItemVec

fn extend<T: IntoIterator<Item = CalcAstItem>>(&mut self, iter: T)

Extends a collection with the contents of an iterator.

fn extend_one(&mut self, item: A)

🔬This is a nightly-only experimental API. (extend_one)

Extends a collection with exactly one element.

fn extend_reserve(&mut self, additional: usize)

🔬This is a nightly-only experimental API. (extend_one)

Reserves capacity in a collection for the given number of additional elements.

impl FromIterator<CalcAstItem> for CalcAstItemVec

fn from_iter<T>(iter: T) -> Self

where T: IntoIterator<Item = CalcAstItem>,

Creates a value from an iterator.

impl Hash for CalcAstItem

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for CalcAstItem

fn cmp(&self, other: &CalcAstItem) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for CalcAstItem

fn eq(&self, other: &CalcAstItem) -> 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 PartialOrd for CalcAstItem

fn partial_cmp(&self, other: &CalcAstItem) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Eq for CalcAstItem

impl StructuralPartialEq for CalcAstItem