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//! Typst's code interpreter.
pub(crate) mod ops;
mod access;
mod binding;
mod call;
mod code;
mod flow;
mod import;
mod markup;
mod math;
mod methods;
mod rules;
mod vm;
pub use self::call::{eval_closure, CapturesVisitor};
pub use self::flow::FlowEvent;
pub use self::import::import;
pub use self::vm::Vm;
pub use typst_library::routines::EvalMode;
use self::access::*;
use self::binding::*;
use self::methods::*;
use comemo::{Track, Tracked, TrackedMut};
use typst_library::diag::{bail, SourceResult};
use typst_library::engine::{Engine, Route, Sink, Traced};
use typst_library::foundations::{Context, Module, NativeElement, Scope, Scopes, Value};
use typst_library::introspection::Introspector;
use typst_library::math::EquationElem;
use typst_library::routines::Routines;
use typst_library::World;
use typst_syntax::{ast, parse, parse_code, parse_math, Source, Span};
/// Evaluate a source file and return the resulting module.
#[comemo::memoize]
#[typst_macros::time(name = "eval", span = source.root().span())]
pub fn eval(
routines: &Routines,
world: Tracked<dyn World + '_>,
traced: Tracked<Traced>,
sink: TrackedMut<Sink>,
route: Tracked<Route>,
source: &Source,
) -> SourceResult<Module> {
// Prevent cyclic evaluation.
let id = source.id();
if route.contains(id) {
panic!("Tried to cyclicly evaluate {:?}", id.vpath());
}
// Prepare the engine.
let introspector = Introspector::default();
let engine = Engine {
routines,
world,
introspector: introspector.track(),
traced,
sink,
route: Route::extend(route).with_id(id),
};
// Prepare VM.
let context = Context::none();
let scopes = Scopes::new(Some(world.library()));
let root = source.root();
let mut vm = Vm::new(engine, context.track(), scopes, root.span());
// Check for well-formedness unless we are in trace mode.
let errors = root.errors();
if !errors.is_empty() && vm.inspected.is_none() {
return Err(errors.into_iter().map(Into::into).collect());
}
// Evaluate the module.
let markup = root.cast::<ast::Markup>().unwrap();
let output = markup.eval(&mut vm)?;
// Handle control flow.
if let Some(flow) = vm.flow {
bail!(flow.forbidden());
}
// Assemble the module.
let name = id
.vpath()
.as_rootless_path()
.file_stem()
.unwrap_or_default()
.to_string_lossy();
Ok(Module::new(name, vm.scopes.top).with_content(output).with_file_id(id))
}
/// Evaluate a string as code and return the resulting value.
///
/// Everything in the output is associated with the given `span`.
#[comemo::memoize]
pub fn eval_string(
routines: &Routines,
world: Tracked<dyn World + '_>,
string: &str,
span: Span,
mode: EvalMode,
scope: Scope,
) -> SourceResult<Value> {
let mut root = match mode {
EvalMode::Code => parse_code(string),
EvalMode::Markup => parse(string),
EvalMode::Math => parse_math(string),
};
root.synthesize(span);
// Check for well-formedness.
let errors = root.errors();
if !errors.is_empty() {
return Err(errors.into_iter().map(Into::into).collect());
}
// Prepare the engine.
let mut sink = Sink::new();
let introspector = Introspector::default();
let traced = Traced::default();
let engine = Engine {
routines,
world,
introspector: introspector.track(),
traced: traced.track(),
sink: sink.track_mut(),
route: Route::default(),
};
// Prepare VM.
let context = Context::none();
let scopes = Scopes::new(Some(world.library()));
let mut vm = Vm::new(engine, context.track(), scopes, root.span());
vm.scopes.scopes.push(scope);
// Evaluate the code.
let output = match mode {
EvalMode::Code => root.cast::<ast::Code>().unwrap().eval(&mut vm)?,
EvalMode::Markup => {
Value::Content(root.cast::<ast::Markup>().unwrap().eval(&mut vm)?)
}
EvalMode::Math => Value::Content(
EquationElem::new(root.cast::<ast::Math>().unwrap().eval(&mut vm)?)
.with_block(false)
.pack()
.spanned(span),
),
};
// Handle control flow.
if let Some(flow) = vm.flow {
bail!(flow.forbidden());
}
Ok(output)
}
/// Evaluate an expression.
pub trait Eval {
/// The output of evaluating the expression.
type Output;
/// Evaluate the expression to the output value.
fn eval(self, vm: &mut Vm) -> SourceResult<Self::Output>;
}
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