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use std::fmt::{self, Debug, Formatter};
use std::sync::Arc;
use ecow::{eco_format, EcoString};
use super::{Content, Scope, Value};
use crate::diag::StrResult;
/// An evaluated module, ready for importing or typesetting.
///
/// Values of this type are cheap to clone and hash.
#[derive(Clone, Hash)]
#[allow(clippy::derived_hash_with_manual_eq)]
pub struct Module {
/// The module's name.
name: EcoString,
/// The reference-counted inner fields.
inner: Arc<Repr>,
}
/// The internal representation.
#[derive(Clone, Hash)]
struct Repr {
/// The top-level definitions that were bound in this module.
scope: Scope,
/// The module's layoutable contents.
content: Content,
}
impl Module {
/// Create a new module.
pub fn new(name: impl Into<EcoString>) -> Self {
Self {
name: name.into(),
inner: Arc::new(Repr { scope: Scope::new(), content: Content::empty() }),
}
}
/// Update the module's name.
pub fn with_name(mut self, name: impl Into<EcoString>) -> Self {
self.name = name.into();
self
}
/// Update the module's scope.
pub fn with_scope(mut self, scope: Scope) -> Self {
Arc::make_mut(&mut self.inner).scope = scope;
self
}
/// Update the module's content.
pub fn with_content(mut self, content: Content) -> Self {
Arc::make_mut(&mut self.inner).content = content;
self
}
/// Get the module's name.
pub fn name(&self) -> &EcoString {
&self.name
}
/// Access the module's scope.
pub fn scope(&self) -> &Scope {
&self.inner.scope
}
/// Access the module's scope, mutably.
pub fn scope_mut(&mut self) -> &mut Scope {
&mut Arc::make_mut(&mut self.inner).scope
}
/// Try to access a definition in the module.
pub fn get(&self, name: &str) -> StrResult<&Value> {
self.scope().get(name).ok_or_else(|| {
eco_format!("module `{}` does not contain `{name}`", self.name())
})
}
/// Extract the module's content.
pub fn content(self) -> Content {
match Arc::try_unwrap(self.inner) {
Ok(repr) => repr.content,
Err(arc) => arc.content.clone(),
}
}
}
impl Debug for Module {
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
write!(f, "<module {}>", self.name())
}
}
impl PartialEq for Module {
fn eq(&self, other: &Self) -> bool {
self.name == other.name && Arc::ptr_eq(&self.inner, &other.inner)
}
}
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