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|
//! The compiler for the _Typst_ typesetting language.
//!
//! # Steps
//! - **Parsing:** The parsing step first transforms a plain string into an
//! [iterator of tokens](crate::syntax::Tokens). Then, a parser constructs a
//! syntax tree from the token stream. The structures describing the tree can
//! be found in the [syntax](crate::syntax) module.
//! - **Layouting:** The next step is to transform the syntax tree into a
//! portable representation of the typesetted document. Types for these can be
//! found in the [layout](crate::layout) module. A finished layout reading for
//! exporting is a [MultiLayout](crate::layout::MultiLayout) consisting of
//! multiple boxes (or pages).
//! - **Exporting:** The finished layout can then be exported into a supported
//! format. Submodules for these formats are located in the
//! [export](crate::export) module. Currently, the only supported output
//! format is [_PDF_](crate::export::pdf). Alternatively, the layout can be
//! serialized to pass it to a suitable renderer.
#![allow(unused)]
pub use toddle;
use std::cell::RefCell;
use std::error::Error;
use std::fmt::{self, Debug, Formatter};
use std::io::Cursor;
use async_trait::async_trait;
use smallvec::smallvec;
use toddle::{Font, OwnedData};
use toddle::query::{FontLoader, FontProvider, SharedFontLoader, FontDescriptor};
use crate::layout::{Layouted, MultiLayout};
use crate::style::{LayoutStyle, PageStyle, TextStyle};
use crate::syntax::{SyntaxModel, Scope, ParseContext, Parsed, parse};
use crate::syntax::span::Position;
#[macro_use]
mod macros;
pub mod error;
pub mod export;
#[macro_use]
pub mod func;
pub mod layout;
pub mod library;
pub mod size;
pub mod style;
pub mod syntax;
/// Transforms source code into typesetted layouts.
///
/// A typesetter can be configured through various methods.
pub struct Typesetter {
/// The font loader shared by all typesetting processes.
loader: GlobalFontLoader,
/// The base layouting style.
style: LayoutStyle,
/// The standard library scope.
scope: Scope,
}
/// The font loader type used in the [`Typesetter`].
///
/// This font loader is ref-cell protected and backed by a dynamic font
/// provider.
pub type GlobalFontLoader = SharedFontLoader<GlobalProvider>;
/// The provider type of font loaders used in the [`Typesetter`].
pub type GlobalProvider = Box<dyn FontProvider<Data=OwnedData, Error=Box<dyn Error>>>;
impl Typesetter {
/// Create a new typesetter.
pub fn new(provider: (GlobalProvider, Vec<FontDescriptor>)) -> Typesetter {
Typesetter {
loader: RefCell::new(FontLoader::new(provider)),
style: LayoutStyle::default(),
scope: Scope::with_std(),
}
}
/// Set the base page style.
pub fn set_page_style(&mut self, style: PageStyle) {
self.style.page = style;
}
/// Set the base text style.
pub fn set_text_style(&mut self, style: TextStyle) {
self.style.text = style;
}
/// A reference to the backing font loader.
pub fn loader(&self) -> &GlobalFontLoader {
&self.loader
}
/// Parse source code into a syntax tree.
pub fn parse(&self, src: &str) -> Parsed<SyntaxModel> {
parse(Position::ZERO, src, ParseContext { scope: &self.scope })
}
/// Layout a syntax tree and return the produced layout.
pub async fn layout(&self, model: &SyntaxModel) -> Layouted<MultiLayout> {
use crate::layout::prelude::*;
let margins = self.style.page.margins();
crate::layout::layout(
&model,
LayoutContext {
loader: &self.loader,
style: &self.style,
base: self.style.page.dimensions.unpadded(margins),
spaces: smallvec![LayoutSpace {
dimensions: self.style.page.dimensions,
padding: margins,
expansion: LayoutExpansion::new(true, true),
}],
repeat: true,
axes: LayoutAxes::new(LeftToRight, TopToBottom),
alignment: LayoutAlignment::new(Origin, Origin),
nested: false,
debug: false,
},
).await
}
/// Process source code directly into a collection of layouts.
pub async fn typeset(&self, src: &str) -> MultiLayout {
let tree = self.parse(src).output;
self.layout(&tree).await.output
}
}
/// Wraps a font provider and transforms its errors into boxed trait objects.
/// This enables font providers that do not return boxed errors to be used with
/// the typesetter.
pub struct DynErrorProvider<P> {
provider: P,
}
impl<P> DynErrorProvider<P>
where P: FontProvider, P::Error: Error + 'static {
/// Create a new dynamic error provider from any provider.
pub fn new(provider: P) -> DynErrorProvider<P> {
DynErrorProvider { provider }
}
}
#[async_trait(?Send)]
impl<P> FontProvider for DynErrorProvider<P>
where P: FontProvider, P::Error: Error + 'static {
type Data = P::Data;
type Error = Box<dyn Error>;
async fn load(&self, index: usize, variant: usize) -> Result<Font<P::Data>, Self::Error> {
Ok(self.provider.load(index, variant).await?)
}
}
|
