1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
|
use typst_library::diag::{warning, At, SourceResult};
use typst_library::foundations::{
Element, Fields, Func, Recipe, Selector, ShowableSelector, Styles, Transformation,
};
use typst_library::layout::BlockElem;
use typst_library::model::ParElem;
use typst_syntax::ast::{self, AstNode};
use crate::{Eval, Vm};
impl Eval for ast::SetRule<'_> {
type Output = Styles;
fn eval(self, vm: &mut Vm) -> SourceResult<Self::Output> {
if let Some(condition) = self.condition() {
if !condition.eval(vm)?.cast::<bool>().at(condition.span())? {
return Ok(Styles::new());
}
}
let target = self.target();
let target = target
.eval(vm)?
.cast::<Func>()
.and_then(|func| {
func.element().ok_or_else(|| {
"only element functions can be used in set rules".into()
})
})
.at(target.span())?;
let args = self.args().eval(vm)?.spanned(self.span());
Ok(target.set(&mut vm.engine, args)?.spanned(self.span()).liftable())
}
}
impl Eval for ast::ShowRule<'_> {
type Output = Recipe;
fn eval(self, vm: &mut Vm) -> SourceResult<Self::Output> {
let selector = self
.selector()
.map(|sel| sel.eval(vm)?.cast::<ShowableSelector>().at(sel.span()))
.transpose()?
.map(|selector| selector.0);
let transform = self.transform();
let transform = match transform {
ast::Expr::Set(set) => Transformation::Style(set.eval(vm)?),
expr => expr.eval(vm)?.cast::<Transformation>().at(transform.span())?,
};
let recipe = Recipe::new(selector, transform, self.span());
check_show_par_set_block(vm, &recipe);
Ok(recipe)
}
}
/// Migration hint for `show par: set block(spacing: ..)`.
fn check_show_par_set_block(vm: &mut Vm, recipe: &Recipe) {
if_chain::if_chain! {
if let Some(Selector::Elem(elem, _)) = recipe.selector();
if *elem == Element::of::<ParElem>();
if let Transformation::Style(styles) = recipe.transform();
if styles.has::<BlockElem>(<BlockElem as Fields>::Enum::Above as _) ||
styles.has::<BlockElem>(<BlockElem as Fields>::Enum::Below as _);
then {
vm.engine.sink.warn(warning!(
recipe.span(),
"`show par: set block(spacing: ..)` has no effect anymore";
hint: "write `set par(spacing: ..)` instead";
hint: "this is specific to paragraphs as they are not considered blocks anymore"
))
}
}
}
|
