Enum pulldown_latex::Event

pub enum Event<'a> {
    Content(Content<'a>),
    Begin(Grouping),
    End,
    Visual(Visual),
    Script {
        ty: ScriptType,
        position: ScriptPosition,
    },
    Space {
        width: Option<(f32, DimensionUnit)>,
        height: Option<(f32, DimensionUnit)>,
        depth: Option<(f32, DimensionUnit)>,
    },
    StateChange(StateChange<'a>),
    Alignment,
    NewLine {
        spacing: Option<(f32, DimensionUnit)>,
        horizontal_lines: Box<[Line]>,
    },
}

All events that can be produced by the parser.

For Renderer Implementors

When an Event is referreing to an “element”, it is referring to the next logical unit of content in the stream. This can be a single Event::Content element, a group marked by Event::Begin and Event::End, an Event::Visual or an Event::Script element, etc.

Event::Spaces, Event::StateChanges, Event::Alignments, and Event::NewLines are not considered elements.

Examples

The following examples all constitute a single element:

Input: \text{Hello, world!}

[Event::Content(Content::Text("Hello, world!"))];

Input: x^2_{\text{max}}

[
    Event::Script { ty: ScriptType::SubSuperscript, position: ScriptPosition::Right },
    Event::Begin(Grouping::Normal),
    Event::Content(Content::Text("max")),
    Event::End,
    Event::Content(Content::Ordinary { content: 'x', stretchy: false }),
];

Variants

Content(Content<'a>)

The event is a Content element.

Begin(Grouping)

The events following this one constitute a “group” which counts as a single element (i.e., a set of elements within {} in LaTeX), until the Event::End event is reached.

End

Marks the end of a “group”.

Visual(Visual)

The n events following this one constitute the content of the Visual element, where n is specified in the documentation of for the Visual variant.

Script

The n events following this one constitute a base and its script(s), where n is specified in the documentation for the ScriptType variant.

Fields

ty: ScriptType

position: ScriptPosition

Space

This events specifes a custom spacing. This is produced by commands such as \kern, \hspace, etc.

If any of the components are None, then the spacing is set to 0 for that component.

Fields

width: Option<(f32, DimensionUnit)>

height: Option<(f32, DimensionUnit)>

depth: Option<(f32, DimensionUnit)>

StateChange(StateChange<'a>)

This event specifies a state change in the renderer.

This state change only applies to the current group nesting and deeper groups.

Alignment

This event specifies an alignment mark in a mathematical environment.

This event is only emitted when inside a Grouping that allows it.

NewLine

This event specifies a line break in a mathematical environment.

This event is only emitted when inside a Grouping that allows it.

Fields

spacing: Option<(f32, DimensionUnit)>

horizontal_lines: Box<[Line]>

Trait Implementations

impl<'a> Clone for Event<'a>

fn clone(&self) -> Event<'a>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<'a> Debug for Event<'a>

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

Formats the value using the given formatter.

impl<'a> PartialEq for Event<'a>

fn eq(&self, other: &Event<'a>) -> bool

This method tests for self and other values to be equal, and is used by ==.

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

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

impl<'a> StructuralPartialEq for Event<'a>