mirror of
https://github.com/typst/typst
synced 2025-05-15 09:35:28 +08:00
117 lines
2.7 KiB
Rust
117 lines
2.7 KiB
Rust
use typst::eval::Scope;
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use super::*;
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/// A text operator in an equation.
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///
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/// ## Example { #example }
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/// ```example
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/// $ tan x = (sin x)/(cos x) $
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/// $ op("custom",
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/// limits: #true)_(n->oo) n $
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/// ```
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///
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/// ## Predefined Operators { #predefined }
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/// Typst predefines the operators `arccos`, `arcsin`, `arctan`, `arg`, `cos`,
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/// `cosh`, `cot`, `coth`, `csc`, `ctg`, `deg`, `det`, `dim`, `exp`, `gcd`,
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/// `hom`, `id`, `im`, `inf`, `ker`, `lg`, `lim`, `liminf`, `limsup`, `ln`,
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/// `log`, `max`, `min`, `mod`, `Pr`, `sec`, `sin`, `sinc`, `sinh`, `sup`,
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/// `tan`, `tanh`, `tg` and `tr`.
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///
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/// Display: Text Operator
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/// Category: math
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#[element(LayoutMath)]
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pub struct OpElem {
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/// The operator's text.
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#[required]
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pub text: EcoString,
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/// Whether the operator should show attachments as limits in display mode.
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#[default(false)]
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pub limits: bool,
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}
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impl LayoutMath for OpElem {
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#[tracing::instrument(skip(ctx))]
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fn layout_math(&self, ctx: &mut MathContext) -> SourceResult<()> {
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let fragment =
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ctx.layout_text(&TextElem::new(self.text()).spanned(self.span()))?;
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ctx.push(
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FrameFragment::new(ctx, fragment.into_frame())
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.with_class(MathClass::Large)
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.with_limits(if self.limits(ctx.styles()) {
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Limits::Display
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} else {
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Limits::Never
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}),
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);
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Ok(())
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}
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}
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macro_rules! ops {
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($($name:ident $(: $value:literal)? $(($tts:tt))?),* $(,)?) => {
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pub(super) fn define(math: &mut Scope) {
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$(math.define(
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stringify!($name),
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OpElem::new(ops!(@name $name $(: $value)?).into())
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.with_limits(ops!(@limit $($tts)*))
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.pack()
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);)*
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let dif = |d| {
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HElem::new(THIN.into()).with_weak(true).pack()
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+ MathStyleElem::new(TextElem::packed(d)).with_italic(Some(false)).pack()
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};
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math.define("dif", dif('d'));
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math.define("Dif", dif('D'));
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}
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};
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(@name $name:ident) => { stringify!($name) };
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(@name $name:ident: $value:literal) => { $value };
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(@limit limits) => { true };
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(@limit) => { false };
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}
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ops! {
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arccos,
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arcsin,
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arctan,
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arg,
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cos,
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cosh,
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cot,
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coth,
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csc,
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ctg,
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deg,
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det (limits),
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dim,
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exp,
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gcd (limits),
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hom,
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id,
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im,
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inf (limits),
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ker,
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lg,
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lim (limits),
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liminf: "lim inf" (limits),
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limsup: "lim sup" (limits),
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ln,
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log,
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max (limits),
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min (limits),
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mod,
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Pr (limits),
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sec,
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sin,
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sinc,
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sinh,
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sup (limits),
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tan,
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tanh,
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tg,
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tr,
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}
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