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
|
use crate::error::Error;
use crate::expr::*;
use dhall_core::*;
use std::collections::HashMap;
use std::fs::File;
use std::io::Read;
use std::path::Path;
use std::path::PathBuf;
#[derive(Debug)]
pub enum ImportError {
Recursive(Import, Box<Error>),
UnexpectedImport(Import),
}
/// A root from which to resolve relative imports.
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum ImportRoot {
LocalDir(PathBuf),
}
type ImportCache = HashMap<Import, Normalized<'static>>;
fn resolve_import(
import: &Import,
root: &ImportRoot,
import_cache: &mut ImportCache,
) -> Result<Normalized<'static>, ImportError> {
use self::ImportRoot::*;
use dhall_core::FilePrefix::*;
use dhall_core::ImportLocation::*;
let cwd = match root {
LocalDir(cwd) => cwd,
};
match &import.location_hashed.location {
Local(prefix, path) => {
let path = match prefix {
// TODO: fail gracefully
Parent => cwd.parent().unwrap().join(path),
Here => cwd.join(path),
_ => unimplemented!("{:?}", import),
};
Ok(load_import(&path, import_cache).map_err(|e| {
ImportError::Recursive(import.clone(), Box::new(e))
})?)
}
_ => unimplemented!("{:?}", import),
}
}
fn load_import(
f: &Path,
import_cache: &mut ImportCache,
) -> Result<Normalized<'static>, Error> {
Ok(do_resolve_expr(Parsed::parse_file(f)?, import_cache)?
.typecheck()?
.normalize())
}
fn do_resolve_expr<'a>(
Parsed(expr, root): Parsed<'a>,
import_cache: &mut ImportCache,
) -> Result<Resolved<'a>, ImportError> {
let resolve =
|import: &Import| -> Result<Normalized<'static>, ImportError> {
match import_cache.get(import) {
Some(expr) => Ok(expr.clone()),
None => {
let expr = resolve_import(import, &root, import_cache)?;
import_cache.insert(import.clone(), expr.clone());
Ok(expr)
}
}
};
let expr = expr.as_ref().traverse_embed(resolve)?;
Ok(Resolved(rc(expr)))
}
fn skip_resolve_expr<'a>(
Parsed(expr, _root): Parsed<'a>,
) -> Result<Resolved<'a>, ImportError> {
let resolve =
|import: &Import| -> Result<Normalized<'static>, ImportError> {
Err(ImportError::UnexpectedImport(import.clone()))
};
let expr = expr.as_ref().traverse_embed(&resolve)?;
Ok(Resolved(rc(expr)))
}
impl<'a> Parsed<'a> {
pub fn parse_file(f: &Path) -> Result<Parsed<'a>, Error> {
let mut buffer = String::new();
File::open(f)?.read_to_string(&mut buffer)?;
let expr = parse_expr(&*buffer)?;
let root = ImportRoot::LocalDir(f.parent().unwrap().to_owned());
Ok(Parsed(expr.unnote().note_absurd(), root))
}
pub fn parse_str(s: &'a str) -> Result<Parsed<'a>, Error> {
let expr = parse_expr(s)?;
let root = ImportRoot::LocalDir(std::env::current_dir()?);
Ok(Parsed(expr, root))
}
#[allow(dead_code)]
pub fn parse_binary_file(f: &Path) -> Result<Parsed<'a>, Error> {
let mut buffer = Vec::new();
File::open(f)?.read_to_end(&mut buffer)?;
let expr = crate::binary::decode(&buffer)?;
let root = ImportRoot::LocalDir(f.parent().unwrap().to_owned());
Ok(Parsed(expr.note_absurd(), root))
}
pub fn resolve(self) -> Result<Resolved<'a>, ImportError> {
crate::imports::do_resolve_expr(self, &mut HashMap::new())
}
#[allow(dead_code)]
pub fn skip_resolve(self) -> Result<Resolved<'a>, ImportError> {
crate::imports::skip_resolve_expr(self)
}
}
#[cfg(test)]
mod spec_tests {
#![rustfmt::skip]
macro_rules! import_success {
($name:ident, $path:expr) => {
make_spec_test!(Import, Success, $name, $path);
};
}
// macro_rules! import_failure {
// ($name:ident, $path:expr) => {
// make_spec_test!(Import, Failure, $name, $path);
// };
// }
// import_success!(success_alternativeEnvNatural, "alternativeEnvNatural");
// import_success!(success_alternativeEnvSimple, "alternativeEnvSimple");
// import_success!(success_alternativeNatural, "alternativeNatural");
// import_success!(success_asText, "asText");
import_success!(success_fieldOrder, "fieldOrder");
// import_failure!(failure_alternativeEnv, "alternativeEnv");
// import_failure!(failure_alternativeEnvMissing, "alternativeEnvMissing");
// import_failure!(failure_cycle, "cycle");
// import_failure!(failure_missing, "missing");
// import_failure!(failure_referentiallyInsane, "referentiallyInsane");
}
|
