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
198
199
200
201
202
203
204
205
206
207
|
use std::str::FromStr;
use knuffel::errors::DecodeError;
use miette::miette;
use regex::Regex;
mod merge_with;
pub use merge_with::*;
#[derive(Debug, Clone, Copy, PartialEq)]
pub struct Percent(pub f64);
// MIN and MAX generics are only used during parsing to check the value.
#[derive(Debug, Default, Clone, Copy, PartialEq)]
pub struct FloatOrInt<const MIN: i32, const MAX: i32>(pub f64);
/// Flag, with an optional explicit value.
///
/// Intended to be used as an `Option<MaybeBool>` field, as a tri-state:
/// - (missing): unset, `None`
/// - just `field`: set, `Some(true)`
/// - explicitly `field true` or `field false`: set, `Some(true)` or `Some(false)`
#[derive(knuffel::Decode, Debug, Clone, Copy, PartialEq, Eq)]
pub struct Flag(#[knuffel(argument, default = true)] pub bool);
/// `Regex` that implements `PartialEq` by its string form.
#[derive(Debug, Clone)]
pub struct RegexEq(pub Regex);
impl PartialEq for RegexEq {
fn eq(&self, other: &Self) -> bool {
self.0.as_str() == other.0.as_str()
}
}
impl Eq for RegexEq {}
impl FromStr for RegexEq {
type Err = <Regex as FromStr>::Err;
fn from_str(s: &str) -> Result<Self, Self::Err> {
Regex::from_str(s).map(Self)
}
}
impl FromStr for Percent {
type Err = miette::Error;
fn from_str(s: &str) -> Result<Self, Self::Err> {
let Some((value, empty)) = s.split_once('%') else {
return Err(miette!("value must end with '%'"));
};
if !empty.is_empty() {
return Err(miette!("trailing characters after '%' are not allowed"));
}
let value: f64 = value.parse().map_err(|_| miette!("error parsing value"))?;
Ok(Percent(value / 100.))
}
}
impl<const MIN: i32, const MAX: i32> MergeWith<FloatOrInt<MIN, MAX>> for f64 {
fn merge_with(&mut self, part: &FloatOrInt<MIN, MAX>) {
*self = part.0;
}
}
impl MergeWith<Flag> for bool {
fn merge_with(&mut self, part: &Flag) {
*self = part.0;
}
}
impl<S: knuffel::traits::ErrorSpan, const MIN: i32, const MAX: i32> knuffel::DecodeScalar<S>
for FloatOrInt<MIN, MAX>
{
fn type_check(
type_name: &Option<knuffel::span::Spanned<knuffel::ast::TypeName, S>>,
ctx: &mut knuffel::decode::Context<S>,
) {
if let Some(type_name) = &type_name {
ctx.emit_error(DecodeError::unexpected(
type_name,
"type name",
"no type name expected for this node",
));
}
}
fn raw_decode(
val: &knuffel::span::Spanned<knuffel::ast::Literal, S>,
ctx: &mut knuffel::decode::Context<S>,
) -> Result<Self, DecodeError<S>> {
match &**val {
knuffel::ast::Literal::Int(ref value) => match value.try_into() {
Ok(v) => {
if (MIN..=MAX).contains(&v) {
Ok(FloatOrInt(f64::from(v)))
} else {
ctx.emit_error(DecodeError::conversion(
val,
format!("value must be between {MIN} and {MAX}"),
));
Ok(FloatOrInt::default())
}
}
Err(e) => {
ctx.emit_error(DecodeError::conversion(val, e));
Ok(FloatOrInt::default())
}
},
knuffel::ast::Literal::Decimal(ref value) => match value.try_into() {
Ok(v) => {
if (f64::from(MIN)..=f64::from(MAX)).contains(&v) {
Ok(FloatOrInt(v))
} else {
ctx.emit_error(DecodeError::conversion(
val,
format!("value must be between {MIN} and {MAX}"),
));
Ok(FloatOrInt::default())
}
}
Err(e) => {
ctx.emit_error(DecodeError::conversion(val, e));
Ok(FloatOrInt::default())
}
},
_ => {
ctx.emit_error(DecodeError::unsupported(
val,
"Unsupported value, only numbers are recognized",
));
Ok(FloatOrInt::default())
}
}
}
}
pub fn expect_only_children<S>(
node: &knuffel::ast::SpannedNode<S>,
ctx: &mut knuffel::decode::Context<S>,
) where
S: knuffel::traits::ErrorSpan,
{
if let Some(type_name) = &node.type_name {
ctx.emit_error(DecodeError::unexpected(
type_name,
"type name",
"no type name expected for this node",
));
}
for val in node.arguments.iter() {
ctx.emit_error(DecodeError::unexpected(
&val.literal,
"argument",
"no arguments expected for this node",
))
}
for name in node.properties.keys() {
ctx.emit_error(DecodeError::unexpected(
name,
"property",
"no properties expected for this node",
))
}
}
pub fn parse_arg_node<S: knuffel::traits::ErrorSpan, T: knuffel::traits::DecodeScalar<S>>(
name: &str,
node: &knuffel::ast::SpannedNode<S>,
ctx: &mut knuffel::decode::Context<S>,
) -> Result<T, DecodeError<S>> {
let mut iter_args = node.arguments.iter();
let val = iter_args.next().ok_or_else(|| {
DecodeError::missing(node, format!("additional argument `{name}` is required"))
})?;
let value = knuffel::traits::DecodeScalar::decode(val, ctx)?;
if let Some(val) = iter_args.next() {
ctx.emit_error(DecodeError::unexpected(
&val.literal,
"argument",
"unexpected argument",
));
}
for name in node.properties.keys() {
ctx.emit_error(DecodeError::unexpected(
name,
"property",
format!("unexpected property `{}`", name.escape_default()),
));
}
for child in node.children() {
ctx.emit_error(DecodeError::unexpected(
child,
"node",
format!("unexpected node `{}`", child.node_name.escape_default()),
));
}
Ok(value)
}
|
