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use crate::func::prelude::*;
/// Ends the current page.
#[derive(Debug, PartialEq)]
pub struct Pagebreak;
function! {
data: Pagebreak,
parse: plain,
layout(_, _) {
Ok(commands![Command::FinishLayout])
}
}
/// Ends the current line.
#[derive(Debug, PartialEq)]
pub struct Linebreak;
function! {
data: Linebreak,
parse: plain,
layout(_, _) {
Ok(commands![Command::FinishFlexRun])
}
}
/// Aligns content in different ways.
#[derive(Debug, PartialEq)]
pub struct Align {
body: Option<SyntaxTree>,
alignment: Alignment,
}
function! {
data: Align,
parse(args, body, ctx) {
let body = parse!(optional: body, ctx);
let alignment = match args.get_ident()? {
"left" => Alignment::Left,
"right" => Alignment::Right,
"center" => Alignment::Center,
s => err!("invalid alignment specifier: {}", s),
};
args.done()?;
Ok(Align {
body,
alignment,
})
}
layout(this, ctx) {
Ok(commands![match &this.body {
Some(body) => {
Command::AddMany(layout_tree(body, LayoutContext {
alignment: this.alignment,
.. ctx
})?)
}
None => Command::SetAlignment(this.alignment)
}])
}
}
/// Layouts content into a box.
#[derive(Debug, PartialEq)]
pub struct Boxed {
body: SyntaxTree,
flow: Flow,
}
function! {
data: Boxed,
parse(args, body, ctx) {
let body = parse!(required: body, ctx);
let mut flow = Flow::Vertical;
if let Some(ident) = args.get_ident_if_present()? {
flow = match ident {
"vertical" => Flow::Vertical,
"horizontal" => Flow::Horizontal,
f => err!("invalid flow specifier: {}", f),
};
}
args.done()?;
Ok(Boxed {
body,
flow,
})
}
layout(this, ctx) {
Ok(commands![
Command::AddMany(layout_tree(&this.body, LayoutContext {
flow: this.flow,
.. ctx
})?)
])
}
}
macro_rules! spacefunc {
($ident:ident, $name:expr, $var:ident => $command:expr) => {
/// Adds whitespace.
#[derive(Debug, PartialEq)]
pub struct $ident(Spacing);
function! {
data: $ident,
parse(args, body, _ctx) {
parse!(forbidden: body);
let spacing = match args.get_expr()? {
Expression::Size(s) => Spacing::Absolute(*s),
Expression::Number(f) => Spacing::Relative(*f as f32),
_ => err!("invalid spacing, expected size or number"),
};
Ok($ident(spacing))
}
layout(this, ctx) {
let $var = match this.0 {
Spacing::Absolute(s) => s,
Spacing::Relative(f) => Size::pt(f * ctx.style.font_size),
};
Ok(commands![$command])
}
}
};
}
/// Absolute or font-relative spacing.
#[derive(Debug, PartialEq)]
enum Spacing {
Absolute(Size),
Relative(f32),
}
spacefunc!(HorizontalSpace, "h", space => Command::AddFlex(Layout::empty(space, Size::zero())));
spacefunc!(VerticalSpace, "v", space => Command::Add(Layout::empty(Size::zero(), space)));
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