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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] module. A finished layout reading for exporting is a
//! [multi-layout](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_. Alternatively, the layout can be serialized to pass it to
//! a suitable renderer.
#![allow(unused)]
pub extern crate toddle;
use std::cell::RefCell;
use smallvec::smallvec;
use toddle::query::{FontLoader, FontProvider, SharedFontLoader};
use toddle::Error as FontError;
use crate::func::Scope;
use crate::layout::{MultiLayout, LayoutResult};
use crate::syntax::{parse, SyntaxTree, ParseContext, Span, ParseResult};
use crate::style::{LayoutStyle, PageStyle, TextStyle};
#[macro_use]
mod macros;
pub mod export;
#[macro_use]
pub mod func;
pub mod layout;
pub mod library;
pub mod syntax;
pub mod size;
pub mod style;
/// Transforms source code into typesetted layouts.
///
/// A typesetter can be configured through various methods.
pub struct Typesetter<'p> {
/// The font loader shared by all typesetting processes.
loader: SharedFontLoader<'p>,
/// The base layouting style.
style: LayoutStyle,
}
impl<'p> Typesetter<'p> {
/// Create a new typesetter.
pub fn new() -> Typesetter<'p> {
Typesetter {
loader: RefCell::new(FontLoader::new()),
style: LayoutStyle::default(),
}
}
/// 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;
}
/// Add a font provider to the context of this typesetter.
pub fn add_font_provider<P: 'p>(&mut self, provider: P)
where P: FontProvider {
self.loader.get_mut().add_provider(provider);
}
/// A reference to the backing font loader.
pub fn loader(&self) -> &SharedFontLoader<'p> {
&self.loader
}
/// Parse source code into a syntax tree.
pub fn parse(&self, src: &str) -> ParseResult<SyntaxTree> {
let scope = Scope::with_std();
parse(src, ParseContext { scope: &scope })
}
/// Layout a syntax tree and return the produced layout.
pub async fn layout(&self, tree: &SyntaxTree) -> LayoutResult<MultiLayout> {
use crate::layout::prelude::*;
let margins = self.style.page.margins();
Ok(layout(
&tree,
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 layout.
pub async fn typeset(&self, src: &str) -> TypesetResult<MultiLayout> {
let tree = self.parse(src)?;
let layout = self.layout(&tree).await?;
Ok(layout)
}
}
/// The result type for typesetting.
pub type TypesetResult<T> = Result<T, TypesetError>;
/// The error type for typesetting.
pub struct TypesetError {
pub message: String,
pub span: Option<Span>,
}
impl TypesetError {
/// Create a new typesetting error.
pub fn with_message(message: String) -> TypesetError {
TypesetError { message, span: None }
}
}
error_type! {
self: TypesetError,
show: f => {
write!(f, "{}", self.message)?;
if let Some(span) = self.span {
write!(f, " at {}", span)?;
}
Ok(())
},
from: (err: std::io::Error, TypesetError::with_message(err.to_string())),
from: (err: FontError, TypesetError::with_message(err.to_string())),
}
|
