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Simplify cfg representation

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This commit is contained in:
Jonas Schievink 2020-10-21 13:57:12 +02:00
parent 20d369a826
commit 2bc4c1ff31
3 changed files with 41 additions and 31 deletions
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22
crates/cfg/src/lib.rs
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@ -5,7 +5,7 @@ mod cfg_expr;
use rustc_hash::FxHashSet;
use tt::SmolStr;
pub use cfg_expr::CfgExpr;
pub use cfg_expr::{CfgAtom, CfgExpr};
/// Configuration options used for conditional compilition on items with `cfg` attributes.
/// We have two kind of options in different namespaces: atomic options like `unix`, and
@ -19,33 +19,25 @@ pub use cfg_expr::CfgExpr;
/// See: https://doc.rust-lang.org/reference/conditional-compilation.html#set-configuration-options
#[derive(Debug, Clone, PartialEq, Eq, Default)]
pub struct CfgOptions {
atoms: FxHashSet<SmolStr>,
key_values: FxHashSet<(SmolStr, SmolStr)>,
enabled: FxHashSet<CfgAtom>,
}
impl CfgOptions {
pub fn check(&self, cfg: &CfgExpr) -> Option<bool> {
cfg.fold(&|key, value| match value {
None => self.atoms.contains(key),
Some(value) => self.key_values.contains(&(key.clone(), value.clone())),
})
cfg.fold(&|atom| self.enabled.contains(atom))
}
pub fn insert_atom(&mut self, key: SmolStr) {
self.atoms.insert(key);
self.enabled.insert(CfgAtom::Flag(key));
}
pub fn insert_key_value(&mut self, key: SmolStr, value: SmolStr) {
self.key_values.insert((key, value));
self.enabled.insert(CfgAtom::KeyValue { key, value });
}
pub fn append(&mut self, other: &CfgOptions) {
for atom in &other.atoms {
self.atoms.insert(atom.clone());
}
for (key, value) in &other.key_values {
self.key_values.insert((key.clone(), value.clone()));
for atom in &other.enabled {
self.enabled.insert(atom.clone());
}
}
}