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use std::pin::Pin;
use std::future::Future;
use smallvec::smallvec;
use crate::func::Command;
use crate::syntax::{SyntaxTree, Node, FuncCall};
use crate::style::TextStyle;
use super::*;
type RecursiveResult<'a, T> = Pin<Box<dyn Future<Output=LayoutResult<T>> + 'a>>;
/// Layout a syntax tree into a multibox.
pub async fn layout(tree: &SyntaxTree, ctx: LayoutContext<'_, '_>) -> LayoutResult<MultiLayout> {
let mut layouter = TreeLayouter::new(ctx);
layouter.layout(tree).await?;
layouter.finish()
}
#[derive(Debug, Clone)]
struct TreeLayouter<'a, 'p> {
ctx: LayoutContext<'a, 'p>,
layouter: LineLayouter,
style: LayoutStyle,
}
impl<'a, 'p> TreeLayouter<'a, 'p> {
/// Create a new syntax tree layouter.
fn new(ctx: LayoutContext<'a, 'p>) -> TreeLayouter<'a, 'p> {
TreeLayouter {
layouter: LineLayouter::new(LineContext {
spaces: ctx.spaces.clone(),
axes: ctx.axes,
alignment: ctx.alignment,
repeat: ctx.repeat,
debug: ctx.debug,
line_spacing: ctx.style.text.line_spacing(),
}),
style: ctx.style.clone(),
ctx,
}
}
fn layout<'b>(&'b mut self, tree: &'b SyntaxTree) -> RecursiveResult<'b, ()> {
Box::pin(async move {
for node in &tree.nodes {
match &node.v {
Node::Text(text) => self.layout_text(text).await?,
Node::Space => self.layout_space(),
Node::Newline => self.layout_paragraph()?,
Node::ToggleItalics => self.style.text.variant.style.toggle(),
Node::ToggleBolder => {
self.style.text.variant.weight.0 += 300 *
if self.style.text.bolder { -1 } else { 1 };
self.style.text.bolder = !self.style.text.bolder;
}
Node::ToggleMonospace => {
let list = &mut self.style.text.fallback.list;
match list.get(0).map(|s| s.as_str()) {
Some("monospace") => { list.remove(0); },
_ => list.insert(0, "monospace".to_string()),
}
}
Node::Func(func) => self.layout_func(func).await?,
}
}
Ok(())
})
}
async fn layout_text(&mut self, text: &str) -> LayoutResult<()> {
let layout = layout_text(text, TextContext {
loader: &self.ctx.loader,
style: &self.style.text,
axes: self.ctx.axes,
alignment: self.ctx.alignment,
}).await?;
self.layouter.add(layout)
}
fn layout_space(&mut self) {
self.layouter.add_primary_spacing(self.style.text.word_spacing(), WORD_KIND);
}
fn layout_paragraph(&mut self) -> LayoutResult<()> {
self.layouter.add_secondary_spacing(self.style.text.paragraph_spacing(), PARAGRAPH_KIND)
}
fn layout_func<'b>(&'b mut self, func: &'b FuncCall) -> RecursiveResult<'b, ()> {
Box::pin(async move {
let commands = func.0.layout(LayoutContext {
style: &self.style,
spaces: self.layouter.remaining(),
nested: true,
debug: false,
.. self.ctx
}).await?;
for command in commands {
use Command::*;
match command {
LayoutTree(tree) => self.layout(tree).await?,
Add(layout) => self.layouter.add(layout)?,
AddMultiple(layouts) => self.layouter.add_multiple(layouts)?,
SpacingFunc(space, kind, axis) => match axis {
Primary => self.layouter.add_primary_spacing(space, kind),
Secondary => self.layouter.add_secondary_spacing(space, kind)?,
}
FinishLine => self.layouter.finish_line()?,
FinishSpace => self.layouter.finish_space(true)?,
BreakParagraph => self.layout_paragraph()?,
BreakPage => {
if self.ctx.nested {
error!("page break cannot be issued from nested context");
}
self.layouter.finish_space(true)?
}
SetTextStyle(style) => {
self.layouter.set_line_spacing(style.line_spacing());
self.style.text = style;
}
SetPageStyle(style) => {
if self.ctx.nested {
error!("page style cannot be altered in nested context");
}
self.style.page = style;
let margins = style.margins();
self.ctx.base = style.dimensions.unpadded(margins);
self.layouter.set_spaces(smallvec![
LayoutSpace {
dimensions: style.dimensions,
padding: margins,
expansion: LayoutExpansion::new(true, true),
}
], true);
}
SetAlignment(alignment) => self.ctx.alignment = alignment,
SetAxes(axes) => {
self.layouter.set_axes(axes);
self.ctx.axes = axes;
}
}
}
Ok(())
})
}
fn finish(self) -> LayoutResult<MultiLayout> {
self.layouter.finish()
}
}
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