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use smallvec::smallvec;
use crate::error::Error;
use crate::func::Command;
use crate::syntax::{Model, DynFuture, SyntaxModel, Node};
use crate::syntax::{SpanVec, Spanned, Span, offset_spans};
use super::*;
#[derive(Debug, Clone)]
pub struct ModelLayouter<'a, 'p> {
ctx: LayoutContext<'a, 'p>,
layouter: LineLayouter,
style: LayoutStyle,
errors: SpanVec<Error>,
}
impl<'a, 'p> ModelLayouter<'a, 'p> {
/// Create a new syntax tree layouter.
pub fn new(ctx: LayoutContext<'a, 'p>) -> ModelLayouter<'a, 'p> {
ModelLayouter {
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,
errors: vec![],
}
}
pub fn layout<'r>(
&'r mut self,
model: Spanned<&'r dyn Model>
) -> DynFuture<'r, ()> { Box::pin(async move {
let layouted = model.v.layout(LayoutContext {
style: &self.style,
spaces: self.layouter.remaining(),
nested: true,
debug: false,
.. self.ctx
}).await;
let commands = layouted.output;
self.errors.extend(offset_spans(layouted.errors, model.span.start));
for command in commands {
self.execute_command(command, model.span).await;
}
}) }
pub fn layout_syntax_model<'r>(
&'r mut self,
model: &'r SyntaxModel
) -> DynFuture<'r, ()> { Box::pin(async move {
use Node::*;
for node in &model.nodes {
match &node.v {
Space => self.layout_space(),
Newline => self.layout_paragraph(),
Text(text) => self.layout_text(text).await,
ToggleItalic => self.style.text.variant.style.toggle(),
ToggleBolder => {
let fac = if self.style.text.bolder { -1 } else { 1 };
self.style.text.variant.weight.0 += 300 * fac;
self.style.text.bolder = !self.style.text.bolder;
}
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::Model(model) => {
self.layout(Spanned::new(model.as_ref(), node.span)).await;
}
}
}
}) }
pub fn finish(self) -> Layouted<MultiLayout> {
Layouted {
output: self.layouter.finish(),
errors: self.errors,
}
}
fn execute_command<'r>(
&'r mut self,
command: Command<'r>,
span: Span,
) -> DynFuture<'r, ()> { Box::pin(async move {
use Command::*;
match command {
LayoutSyntaxModel(model) => self.layout_syntax_model(model).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 {
self.errors.push(err!(span;
"page break cannot be issued from nested context"));
} else {
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 {
self.errors.push(err!(span;
"page style cannot be changed from nested context"));
} else {
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;
}
}
}) }
async fn layout_text(&mut self, text: &str) {
self.layouter.add(layout_text(text, TextContext {
loader: &self.ctx.loader,
style: &self.style.text,
axes: self.ctx.axes,
alignment: self.ctx.alignment,
}).await)
}
fn layout_space(&mut self) {
self.layouter.add_primary_spacing(
self.style.text.word_spacing(),
SpacingKind::WORD,
);
}
fn layout_paragraph(&mut self) {
self.layouter.add_secondary_spacing(
self.style.text.paragraph_spacing(),
SpacingKind::PARAGRAPH,
);
}
}
|
