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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::parsing::Tokens). Then the [parser](crate::parsing::Parser) operates on that to
//! construct a syntax tree. The structures describing the tree can be found in the [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 [doc] and [layout] modules. This
//! representation contains already the finished layout.
//! - **Exporting:** The finished document can then be exported into supported formats. Submodules
//! for the supported formats are located in the [export] module. Currently the only supported
//! format is _PDF_.
pub extern crate toddle;
use std::cell::RefCell;
use toddle::query::{FontLoader, SharedFontLoader, FontProvider};
use crate::doc::Document;
use crate::func::Scope;
use crate::parsing::{parse, ParseContext, ParseResult, ParseError};
use crate::layout::{layout, LayoutContext, Alignment, LayoutSpace, LayoutError, LayoutResult};
use crate::layout::boxed::BoxLayout;
use crate::style::{PageStyle, TextStyle};
use crate::syntax::SyntaxTree;
#[macro_use]
mod error;
pub mod doc;
pub mod export;
pub mod func;
pub mod layout;
pub mod parsing;
pub mod size;
pub mod style;
pub mod syntax;
pub mod library;
/// Transforms source code into typesetted documents.
///
/// Can be configured through various methods.
pub struct Typesetter<'p> {
/// The font loader shared by all typesetting processes.
loader: SharedFontLoader<'p>,
/// The default text style.
text_style: TextStyle,
/// The default page style.
page_style: PageStyle,
}
impl<'p> Typesetter<'p> {
/// Create a new typesetter.
#[inline]
pub fn new() -> Typesetter<'p> {
Typesetter {
loader: RefCell::new(FontLoader::new()),
text_style: TextStyle::default(),
page_style: PageStyle::default(),
}
}
/// Set the default page style for the document.
#[inline]
pub fn set_page_style(&mut self, style: PageStyle) {
self.page_style = style;
}
/// Set the default text style for the document.
#[inline]
pub fn set_text_style(&mut self, style: TextStyle) {
self.text_style = style;
}
/// Add a font provider to the context of this typesetter.
#[inline]
pub fn add_font_provider<P: 'p>(&mut self, provider: P) where P: FontProvider {
self.loader.get_mut().add_provider(provider);
}
/// 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 layout and the referenced font list.
pub fn layout(&self, tree: &SyntaxTree) -> LayoutResult<BoxLayout> {
let pages = layout(&tree, LayoutContext {
loader: &self.loader,
style: &self.text_style,
space: LayoutSpace {
dimensions: self.page_style.dimensions,
padding: self.page_style.margins,
alignment: Alignment::Left,
shrink_to_fit: false,
},
})?;
Ok(pages)
}
/// Typeset a portable document from source code.
pub fn typeset(&self, src: &str) -> Result<Document, TypesetError> {
let tree = self.parse(src)?;
let layout = self.layout(&tree)?;
let document = layout.into_doc();
Ok(document)
}
/// A reference to the backing font loader.
pub fn loader(&self) -> &SharedFontLoader<'p> {
&self.loader
}
}
/// The general error type for typesetting.
pub enum TypesetError {
/// An error that occured while parsing.
Parse(ParseError),
/// An error that occured while layouting.
Layout(LayoutError),
}
error_type! {
err: TypesetError,
show: f => match err {
TypesetError::Parse(e) => write!(f, "parse error: {}", e),
TypesetError::Layout(e) => write!(f, "layout error: {}", e),
},
source: match err {
TypesetError::Parse(e) => Some(e),
TypesetError::Layout(e) => Some(e),
},
from: (ParseError, TypesetError::Parse(err)),
from: (LayoutError, TypesetError::Layout(err)),
}
|
