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