130 lines
3.9 KiB
Rust
130 lines
3.9 KiB
Rust
//! The compiler for the _Typst_ typesetting language.
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//!
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//! # Steps
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//! - **Parsing:** The parsing step first transforms a plain string into an
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//! [iterator of tokens][tokens]. Then, a [parser] constructs a syntax tree
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//! from the token stream. The structures describing the tree can be found in
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//! the [syntax] module.
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//! - **Layouting:** The next step is to transform the syntax tree into a
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//! portable representation of the typesetted document. Types for these can be
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//! found in the [layout] module. A finished layout ready for exporting is a
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//! [`MultiLayout`] consisting of multiple boxes (or pages).
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//! - **Exporting:** The finished layout can then be exported into a supported
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//! format. Submodules for these formats are located in the [export] module.
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//! Currently, the only supported output format is [_PDF_].
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//!
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//! [tokens]: parse/struct.Tokens.html
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//! [parser]: parse/fn.parse.html
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//! [syntax]: syntax/index.html
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//! [layout]: layout/index.html
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//! [export]: export/index.html
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//! [_PDF_]: export/pdf/index.html
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//! [`MultiLayout`]: layout/type.MultiLayout.html
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#[macro_use]
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pub mod diag;
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pub mod color;
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pub mod eval;
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pub mod export;
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pub mod font;
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pub mod geom;
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pub mod layout;
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pub mod length;
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pub mod library;
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pub mod paper;
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pub mod parse;
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pub mod prelude;
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pub mod shaping;
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pub mod syntax;
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use std::fmt::Debug;
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use std::future::Future;
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use std::pin::Pin;
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use crate::diag::Diag;
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use crate::eval::State;
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use crate::font::SharedFontLoader;
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use crate::layout::BoxLayout;
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use crate::syntax::{Deco, Offset, Pos, SpanVec};
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/// Process source code directly into a collection of layouts.
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pub async fn typeset(
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src: &str,
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state: State,
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loader: SharedFontLoader,
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) -> Pass<Vec<BoxLayout>> {
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let parsed = parse::parse(src);
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let layouted = layout::layout(&parsed.output, state, loader).await;
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let feedback = Feedback::merge(parsed.feedback, layouted.feedback);
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Pass::new(layouted.output, feedback)
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}
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/// A dynamic future type which allows recursive invocation of async functions
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/// when used as the return type.
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pub type DynFuture<'a, T> = Pin<Box<dyn Future<Output = T> + 'a>>;
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/// The result of some pass: Some output `T` and feedback data.
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#[derive(Debug, Clone, Eq, PartialEq)]
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pub struct Pass<T> {
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/// The output of this compilation pass.
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pub output: T,
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/// User feedback data accumulated in this pass.
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pub feedback: Feedback,
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}
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impl<T> Pass<T> {
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/// Create a new pass from output and feedback data.
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pub fn new(output: T, feedback: Feedback) -> Self {
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Self { output, feedback }
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}
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/// Create a new pass with empty feedback.
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pub fn okay(output: T) -> Self {
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Self { output, feedback: Feedback::new() }
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}
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/// Map the output type and keep the feedback data.
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pub fn map<U>(self, f: impl FnOnce(T) -> U) -> Pass<U> {
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Pass {
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output: f(self.output),
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feedback: self.feedback,
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}
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}
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}
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/// Diagnostic and semantic syntax highlighting data.
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#[derive(Debug, Default, Clone, Eq, PartialEq)]
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pub struct Feedback {
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/// Diagnostics about the source code.
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pub diags: SpanVec<Diag>,
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/// Decorations of the source code for semantic syntax highlighting.
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pub decos: SpanVec<Deco>,
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}
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impl Feedback {
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/// Create a new feedback instance without errors and decos.
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pub fn new() -> Self {
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Self { diags: vec![], decos: vec![] }
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}
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/// Merged two feedbacks into one.
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pub fn merge(mut a: Self, b: Self) -> Self {
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a.extend(b);
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a
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}
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/// Add other feedback data to this feedback.
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pub fn extend(&mut self, more: Self) {
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self.diags.extend(more.diags);
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self.decos.extend(more.decos);
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}
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/// Add more feedback whose spans are local and need to be offset by an
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/// `offset` to be correct in this feedback's context.
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pub fn extend_offset(&mut self, more: Self, offset: Pos) {
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self.diags.extend(more.diags.offset(offset));
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self.decos.extend(more.decos.offset(offset));
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}
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}
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