1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
|
#![doc(html_root_url = "https://docs.rs/dhall/0.9.0")]
#![allow(
clippy::implicit_hasher,
clippy::module_inception,
clippy::needless_lifetimes,
clippy::new_ret_no_self,
clippy::new_without_default,
clippy::try_err,
clippy::useless_format
)]
pub mod builtins;
pub mod ctxt;
pub mod error;
pub mod operations;
pub mod semantics;
pub mod syntax;
pub mod utils;
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;
pub use ctxt::*;
#[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<'cx>(Hir<'cx>);
/// A typed expression
#[derive(Debug, Clone)]
pub struct Typed<'cx> {
pub hir: Hir<'cx>,
pub ty: Type<'cx>,
}
/// A normalized expression.
///
/// This is actually a lie, because the expression will only get normalized on demand.
#[derive(Debug, Clone)]
pub struct Normalized<'cx>(Nir<'cx>);
/// Controls conversion from `Nir` to `Expr`
#[derive(Copy, Clone, Default)]
pub struct ToExprOptions {
/// Whether to convert all variables to `_`
pub alpha: bool,
}
impl Parsed {
/// Construct from an `Expr`. This `Expr` will have imports disabled.
pub fn from_expr_without_imports(e: Expr) -> Self {
Parsed(e, ImportLocation::dhall_code_without_imports())
}
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<'cx>(self, cx: Ctxt<'cx>) -> Result<Resolved<'cx>, Error> {
resolve::resolve(cx, self)
}
pub fn skip_resolve<'cx>(
self,
cx: Ctxt<'cx>,
) -> Result<Resolved<'cx>, Error> {
resolve::skip_resolve(cx, self)
}
/// Converts a value back to the corresponding AST expression.
pub fn to_expr(&self) -> Expr {
self.0.clone()
}
}
impl<'cx> Resolved<'cx> {
pub fn typecheck(&self, cx: Ctxt<'cx>) -> Result<Typed<'cx>, TypeError> {
Ok(Typed::from_tir(typecheck(cx, &self.0)?))
}
pub fn typecheck_with(
self,
cx: Ctxt<'cx>,
ty: &Hir<'cx>,
) -> Result<Typed<'cx>, TypeError> {
Ok(Typed::from_tir(typecheck_with(cx, &self.0, ty)?))
}
/// Converts a value back to the corresponding AST expression.
pub fn to_expr(&self, cx: Ctxt<'cx>) -> Expr {
self.0.to_expr_noopts(cx)
}
}
impl<'cx> Typed<'cx> {
fn from_tir(tir: Tir<'cx, '_>) -> 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, cx: Ctxt<'cx>) -> Normalized<'cx> {
Normalized(self.hir.eval_closed_expr(cx))
}
/// Converts a value back to the corresponding AST expression.
fn to_expr(&self, cx: Ctxt<'cx>) -> Expr {
self.hir.to_expr(cx, ToExprOptions { alpha: false })
}
pub fn as_hir(&self) -> &Hir<'cx> {
&self.hir
}
pub fn ty(&self) -> &Type<'cx> {
&self.ty
}
pub fn get_type(&self) -> Result<Normalized<'cx>, TypeError> {
Ok(Normalized(self.ty.clone().into_nir()))
}
}
impl<'cx> Normalized<'cx> {
/// Converts a value back to the corresponding AST expression.
pub fn to_expr(&self, cx: Ctxt<'cx>) -> Expr {
self.0.to_expr(cx, ToExprOptions::default())
}
/// Converts a value back to the corresponding Hir expression.
pub fn to_hir(&self) -> Hir<'cx> {
self.0.to_hir_noenv()
}
pub fn as_nir(&self) -> &Nir<'cx> {
&self.0
}
/// Converts a value back to the corresponding AST expression, alpha-normalizing in the process.
pub fn to_expr_alpha(&self, cx: Ctxt<'cx>) -> Expr {
self.0.to_expr(cx, 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<'cx> Eq for Normalized<'cx> {}
impl<'cx> PartialEq for Normalized<'cx> {
fn eq(&self, other: &Self) -> bool {
self.0 == other.0
}
}
|
