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87.1 %
Functions
6.82 %
use crate::ast::serde::{AsId, HasId};
use crate::{ast::DeclarationPtr, bug};
use derivative::Derivative;
use parking_lot::MappedRwLockReadGuard;
use serde::{Deserialize, Serialize};
use serde_with::serde_as;
use std::fmt::{Display, Formatter};
use uniplate::Uniplate;
use super::{
Atom, DeclarationKind, DomainPtr, Expression, GroundDomain, Literal, Metadata, Moo, Name,
categories::{Category, CategoryOf},
domains::HasDomain,
};
/// A reference to a declaration (variable, parameter, etc.)
///
/// This is a thin wrapper around [`DeclarationPtr`] with two main purposes:
/// 1. Encapsulate the serde pragmas (e.g., serializing as IDs rather than full objects)
/// 2. Enable type-directed traversals of references via uniplate
#[serde_as]
#[derive(
Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Serialize, Deserialize, Uniplate, Derivative,
)]
#[derivative(Hash)]
#[uniplate()]
#[biplate(to=DeclarationPtr)]
#[biplate(to=Name)]
pub struct Reference {
#[serde_as(as = "AsId")]
pub ptr: DeclarationPtr,
}
impl Reference {
pub fn new(ptr: DeclarationPtr) -> Self {
Reference { ptr }
pub fn ptr(&self) -> &DeclarationPtr {
&self.ptr
pub fn into_ptr(self) -> DeclarationPtr {
self.ptr
pub fn name(&self) -> MappedRwLockReadGuard<'_, Name> {
self.ptr.name()
pub fn id(&self) -> crate::ast::serde::ObjId {
self.ptr.id()
pub fn domain(&self) -> Option<DomainPtr> {
self.ptr.domain()
pub fn resolved_domain(&self) -> Option<Moo<GroundDomain>> {
self.domain()?.resolve()
/// Returns the expression behind a value-letting reference, if this is one.
pub fn resolve_expression(&self) -> Option<Expression> {
if let Some(expr) = self.ptr().as_value_letting() {
return Some(expr.clone());
let generator = {
let kind = self.ptr.kind();
if let DeclarationKind::Quantified(inner) = &*kind {
inner.generator().cloned()
} else {
None
if let Some(generator) = generator
&& let Some(expr) = generator.as_value_letting()
{
/// Evaluates this reference to a literal if it resolves to a constant.
pub fn resolve_constant(&self) -> Option<Literal> {
self.resolve_expression()
.and_then(|expr| super::eval::eval_constant(&expr))
/// Resolves this reference to an atomic expression, if possible.
pub fn resolve_atomic(&self) -> Option<Atom> {
self.resolve_expression().and_then(|expr| match expr {
Expression::Atomic(_, atom) => Some(atom),
_ => None,
})
impl From<Reference> for Expression {
fn from(value: Reference) -> Self {
Expression::Atomic(Metadata::new(), value.into())
impl From<DeclarationPtr> for Reference {
fn from(ptr: DeclarationPtr) -> Self {
Reference::new(ptr)
impl CategoryOf for Reference {
fn category_of(&self) -> Category {
self.ptr.category_of()
impl HasDomain for Reference {
fn domain_of(&self) -> DomainPtr {
self.ptr.domain().unwrap_or_else(|| {
bug!(
"reference ({name}) should have a domain",
name = self.ptr.name()
)
impl Display for Reference {
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
self.ptr.name().fmt(f)