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#![doc(html_root_url = "https://docs.rs/dhall/0.5.3")]
#![allow(
clippy::implicit_hasher,
clippy::module_inception,
clippy::needless_lifetimes,
clippy::new_ret_no_self,
clippy::new_without_default,
clippy::useless_format
)]
mod tests;
pub mod builtins;
pub mod error;
pub mod operations;
pub mod semantics;
pub mod syntax;
use std::fmt::Display;
use std::path::Path;
use url::Url;
use crate::error::{Error, TypeError};
use crate::semantics::parse;
use crate::semantics::resolve;
use crate::semantics::resolve::ImportLocation;
use crate::semantics::{typecheck, typecheck_with, Hir, Nir, Tir, Type};
use crate::syntax::Expr;
#[derive(Debug, Clone)]
pub struct Parsed(Expr, ImportLocation);
/// An expression where all imports have been resolved
///
/// Invariant: there must be no `Import` nodes or `ImportAlt` operations left.
#[derive(Debug, Clone)]
pub struct Resolved(Hir);
/// A typed expression
#[derive(Debug, Clone)]
pub struct Typed {
hir: Hir,
ty: Type,
}
/// A normalized expression.
///
/// This is actually a lie, because the expression will only get normalized on demand.
#[derive(Debug, Clone)]
pub struct Normalized(Nir);
/// Controls conversion from `Nir` to `Expr`
#[derive(Copy, Clone, Default)]
pub struct ToExprOptions {
/// Whether to convert all variables to `_`
pub alpha: bool,
}
impl Parsed {
pub fn parse_file(f: &Path) -> Result<Parsed, Error> {
parse::parse_file(f)
}
pub fn parse_remote(url: Url) -> Result<Parsed, Error> {
parse::parse_remote(url)
}
pub fn parse_str(s: &str) -> Result<Parsed, Error> {
parse::parse_str(s)
}
pub fn parse_binary_file(f: &Path) -> Result<Parsed, Error> {
parse::parse_binary_file(f)
}
#[allow(dead_code)]
pub fn parse_binary(data: &[u8]) -> Result<Parsed, Error> {
parse::parse_binary(data)
}
pub fn resolve(self) -> Result<Resolved, Error> {
resolve::resolve(self)
}
pub fn skip_resolve(self) -> Result<Resolved, Error> {
resolve::skip_resolve(self)
}
/// Converts a value back to the corresponding AST expression.
pub fn to_expr(&self) -> Expr {
self.0.clone()
}
}
impl Resolved {
pub fn typecheck(&self) -> Result<Typed, TypeError> {
Ok(Typed::from_tir(typecheck(&self.0)?))
}
pub fn typecheck_with(self, ty: &Hir) -> Result<Typed, TypeError> {
Ok(Typed::from_tir(typecheck_with(&self.0, ty)?))
}
/// Converts a value back to the corresponding AST expression.
pub fn to_expr(&self) -> Expr {
self.0.to_expr_noopts()
}
}
impl Typed {
fn from_tir(tir: Tir<'_>) -> Self {
Typed {
hir: tir.as_hir().clone(),
ty: tir.ty().clone(),
}
}
/// Reduce an expression to its normal form, performing beta reduction
pub fn normalize(&self) -> Normalized {
Normalized(self.hir.eval_closed_expr())
}
/// Converts a value back to the corresponding AST expression.
fn to_expr(&self) -> Expr {
self.hir.to_expr(ToExprOptions { alpha: false })
}
pub fn ty(&self) -> &Type {
&self.ty
}
pub fn get_type(&self) -> Result<Normalized, TypeError> {
Ok(Normalized(self.ty.clone().into_nir()))
}
}
impl Normalized {
/// Converts a value back to the corresponding AST expression.
pub fn to_expr(&self) -> Expr {
self.0.to_expr(ToExprOptions::default())
}
/// Converts a value back to the corresponding Hir expression.
pub fn to_hir(&self) -> Hir {
self.0.to_hir_noenv()
}
pub fn as_nir(&self) -> &Nir {
&self.0
}
/// Converts a value back to the corresponding AST expression, alpha-normalizing in the process.
pub fn to_expr_alpha(&self) -> Expr {
self.0.to_expr(ToExprOptions { alpha: true })
}
}
macro_rules! derive_traits_for_wrapper_struct {
($ty:ident) => {
impl std::cmp::PartialEq for $ty {
fn eq(&self, other: &Self) -> bool {
self.0 == other.0
}
}
impl std::cmp::Eq for $ty {}
impl std::fmt::Display for $ty {
fn fmt(
&self,
f: &mut std::fmt::Formatter,
) -> Result<(), std::fmt::Error> {
self.0.fmt(f)
}
}
};
}
derive_traits_for_wrapper_struct!(Parsed);
impl From<Parsed> for Expr {
fn from(other: Parsed) -> Self {
other.to_expr()
}
}
impl From<Normalized> for Expr {
fn from(other: Normalized) -> Self {
other.to_expr()
}
}
impl Display for Resolved {
fn fmt(&self, f: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
self.to_expr().fmt(f)
}
}
impl Eq for Typed {}
impl PartialEq for Typed {
fn eq(&self, other: &Self) -> bool {
self.normalize() == other.normalize()
}
}
impl Display for Typed {
fn fmt(&self, f: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
self.to_expr().fmt(f)
}
}
impl Eq for Normalized {}
impl PartialEq for Normalized {
fn eq(&self, other: &Self) -> bool {
self.0 == other.0
}
}
impl Display for Normalized {
fn fmt(&self, f: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
self.to_expr().fmt(f)
}
}
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