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
|
//! ra_cfg defines conditional compiling options, `cfg` attibute parser and evaluator
use ra_syntax::SmolStr;
use rustc_hash::{FxHashMap, FxHashSet};
mod cfg_expr;
pub use cfg_expr::{parse_cfg, CfgExpr};
#[derive(Debug, Clone, PartialEq, Eq, Default)]
pub struct CfgOptions {
atoms: FxHashSet<SmolStr>,
features: FxHashSet<SmolStr>,
options: FxHashMap<SmolStr, SmolStr>,
}
impl CfgOptions {
pub fn check(&self, cfg: &CfgExpr) -> Option<bool> {
cfg.fold(&|key, value| match value {
None => self.atoms.contains(key),
Some(value) if key == "feature" => self.features.contains(value),
Some(value) => self.options.get(key).map_or(false, |v| v == value),
})
}
pub fn is_cfg_enabled(&self, attr: &tt::Subtree) -> Option<bool> {
self.check(&parse_cfg(attr))
}
pub fn atom(mut self, name: SmolStr) -> CfgOptions {
self.atoms.insert(name);
self
}
pub fn feature(mut self, name: SmolStr) -> CfgOptions {
self.features.insert(name);
self
}
pub fn option(mut self, key: SmolStr, value: SmolStr) -> CfgOptions {
self.options.insert(key, value);
self
}
}
|
