Horizontal

Enum Horizontal

pub enum Horizontal {
Show 14 variants
    Char(Char),
    HBox(HBox),
    VBox(VBox),
    Rule(Rule),
    Mark(Mark),
    Insertion(Insertion),
    Adjust(Adjust),
    Ligature(Ligature),
    Discretionary(Discretionary),
    Whatsit(Rc<dyn Whatsit>),
    Math(Math),
    Glue(Glue),
    Kern(Kern),
    Penalty(Penalty),
}

Expand description

Element of a horizontal list.

Variants§

Char(Char)

HBox(HBox)

VBox(VBox)

Rule(Rule)

Mark(Mark)

Insertion(Insertion)

Adjust(Adjust)

Ligature(Ligature)

Discretionary(Discretionary)

Whatsit(Rc<dyn Whatsit>)

Math(Math)

Glue(Glue)

Kern(Kern)

Penalty(Penalty)

Implementations§

impl Horizontal

pub fn precedes_break(&self) -> bool

Whether a glue node that comes after this node may be broken.

For char nodes, this function is essentially undefined in Knuth’s TeX. More specifically, the value depends on the exact character code. In TeX this function is never called for char nodes which is why this is not a problem. Here, we return true for char nodes based on my analysis of all places in Knuth’s TeX where it is invoked:

TeX.2021.868: precedes_break is called on variable cur_p which is a pointer to a horizontal list. Before this call, the calling code first checks if the node is a character and if so follows the same code path. Thus returning true here is the right thing to do.
TeX.2021.973: the function is called on a variable prev_p which is a pointer to a vertical list and so the char case never arises.
TeX.2021.1000: same as the last case.

This function is defined in TeX.2021.148.

pub fn non_discardable(&self) -> bool

Whether this node is discarded after a break.

As with Self::precedes_break, this function is essentially undefined for char nodes in Knuth’s TeX. However there is only one call site (TeX.2021.879) and in that call site char nodes behave as if this function returns true.

This function is defined in TeX.2021.148.

Trait Implementations§

impl Clone for Horizontal

fn clone(&self) -> Horizontal

Returns a duplicate of the value. Read more

1.0.0 · Source§

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

Performs copy-assignment from source. Read more

impl Debug for Horizontal

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

Formats the value using the given formatter. Read more

impl From<Adjust> for Horizontal

fn from(value: Adjust) -> Self

Converts to this type from the input type.

impl From<Char> for Horizontal

fn from(value: Char) -> Self

Converts to this type from the input type.

impl From<Discretionary> for Horizontal

fn from(value: Discretionary) -> Self

Converts to this type from the input type.

impl From<DiscretionaryElem> for Horizontal

fn from(value: DiscretionaryElem) -> Self

Converts to this type from the input type.

impl From<Glue> for Horizontal

fn from(value: Glue) -> Self

Converts to this type from the input type.

impl From<HBox> for Horizontal

fn from(value: HBox) -> Self

Converts to this type from the input type.

impl From<Insertion> for Horizontal

fn from(value: Insertion) -> Self

Converts to this type from the input type.

impl From<Kern> for Horizontal

fn from(value: Kern) -> Self

Converts to this type from the input type.

impl From<Ligature> for Horizontal

fn from(value: Ligature) -> Self

Converts to this type from the input type.

impl From<Mark> for Horizontal

fn from(value: Mark) -> Self

Converts to this type from the input type.

impl From<Math> for Horizontal

fn from(value: Math) -> Self

Converts to this type from the input type.

impl From<Penalty> for Horizontal

fn from(value: Penalty) -> Self

Converts to this type from the input type.

impl From<Rule> for Horizontal

fn from(value: Rule) -> Self

Converts to this type from the input type.

impl From<VBox> for Horizontal

fn from(value: VBox) -> Self

Converts to this type from the input type.

impl PartialEq for Horizontal

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

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

1.0.0 · Source§

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 ToBoxLang for Horizontal

type Output = Horizontal<'static>

fn to_box_lang(&self) -> Self::Output

impl TryFrom<Horizontal> for DiscretionaryElem

type Error = ()

The type returned in the event of a conversion error.

fn try_from(value: Horizontal) -> Result<Self, Self::Error>

Performs the conversion.

Auto Trait Implementations§

impl Freeze for Horizontal

impl !RefUnwindSafe for Horizontal

impl !Send for Horizontal

impl !Sync for Horizontal

impl Unpin for Horizontal

impl !UnwindSafe for Horizontal

Blanket Implementations§

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Gets the TypeId of self. Read more

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Immutably borrows from an owned value. Read more

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Mutably borrows from an owned value. Read more

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unsafe fn clone_to_uninit(&self, dest: *mut u8)

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

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